VASNPRINTF (DCHAR_T *resultbuf, size_t *lengthp,
            const FCHAR_T *format, va_list args)
{
  DIRECTIVES d;
  arguments a;

  if (PRINTF_PARSE (format, &d, &a) < 0)
    /* errno is already set.  */
    return NULL;

#define CLEANUP() \
  if (d.dir != d.direct_alloc_dir)                                      \
    free (d.dir);                                                       \
  if (a.arg != a.direct_alloc_arg)                                      \
    free (a.arg);

  if (PRINTF_FETCHARGS (args, &a) < 0)
    {
      CLEANUP ();
      errno = EINVAL;
      return NULL;
    }

  {
    size_t buf_neededlength;
    TCHAR_T *buf;
    TCHAR_T *buf_malloced;
    const FCHAR_T *cp;
    size_t i;
    DIRECTIVE *dp;
    /* Output string accumulator.  */
    DCHAR_T *result;
    size_t allocated;
    size_t length;

    /* Allocate a small buffer that will hold a directive passed to
       sprintf or snprintf.  */
    buf_neededlength =
      xsum4 (7, d.max_width_length, d.max_precision_length, 6);
#if HAVE_ALLOCA
    if (buf_neededlength < 4000 / sizeof (TCHAR_T))
      {
        buf = (TCHAR_T *) alloca (buf_neededlength * sizeof (TCHAR_T));
        buf_malloced = NULL;
      }
    else
#endif
      {
        size_t buf_memsize = xtimes (buf_neededlength, sizeof (TCHAR_T));
        if (size_overflow_p (buf_memsize))
          goto out_of_memory_1;
        buf = (TCHAR_T *) malloc (buf_memsize);
        if (buf == NULL)
          goto out_of_memory_1;
        buf_malloced = buf;
      }

    if (resultbuf != NULL)
      {
        result = resultbuf;
        allocated = *lengthp;
      }
    else
      {
        result = NULL;
        allocated = 0;
      }
    length = 0;
    /* Invariants:
       result is either == resultbuf or == NULL or malloc-allocated.
       If length > 0, then result != NULL.  */

    /* Ensures that allocated >= needed.  Aborts through a jump to
       out_of_memory if needed is SIZE_MAX or otherwise too big.  */
#define ENSURE_ALLOCATION(needed) \
    if ((needed) > allocated)                                                \
      {                                                                      \
        size_t memory_size;                                                  \
        DCHAR_T *memory;                                                     \
                                                                             \
        allocated = (allocated > 0 ? xtimes (allocated, 2) : 12);            \
        if ((needed) > allocated)                                            \
          allocated = (needed);                                              \
        memory_size = xtimes (allocated, sizeof (DCHAR_T));                  \
        if (size_overflow_p (memory_size))                                   \
          goto out_of_memory;                                                \
        if (result == resultbuf || result == NULL)                           \
          memory = (DCHAR_T *) malloc (memory_size);                         \
        else                                                                 \
          memory = (DCHAR_T *) realloc (result, memory_size);                \
        if (memory == NULL)                                                  \
          goto out_of_memory;                                                \
        if (result == resultbuf && length > 0)                               \
          DCHAR_CPY (memory, result, length);                                \
        result = memory;                                                     \
      }

    for (cp = format, i = 0, dp = &d.dir[0]; ; cp = dp->dir_end, i++, dp++)
      {
        if (cp != dp->dir_start)
          {
            size_t n = dp->dir_start - cp;
            size_t augmented_length = xsum (length, n);

            ENSURE_ALLOCATION (augmented_length);
            /* This copies a piece of FCHAR_T[] into a DCHAR_T[].  Here we
               need that the format string contains only ASCII characters
               if FCHAR_T and DCHAR_T are not the same type.  */
            if (sizeof (FCHAR_T) == sizeof (DCHAR_T))
              {
                DCHAR_CPY (result + length, (const DCHAR_T *) cp, n);
                length = augmented_length;
              }
            else
              {
                do
                  result[length++] = *cp++;
                while (--n > 0);
              }
          }
        if (i == d.count)
          break;

        /* Execute a single directive.  */
        if (dp->conversion == '%')
          {
            size_t augmented_length;

            if (!(dp->arg_index == ARG_NONE))
              abort ();
            augmented_length = xsum (length, 1);
            ENSURE_ALLOCATION (augmented_length);
            result[length] = '%';
            length = augmented_length;
          }
        else
          {
            if (!(dp->arg_index != ARG_NONE))
              abort ();

            if (dp->conversion == 'n')
              {
                switch (a.arg[dp->arg_index].type)
                  {
                  case TYPE_COUNT_SCHAR_POINTER:
                    *a.arg[dp->arg_index].a.a_count_schar_pointer = length;
                    break;
                  case TYPE_COUNT_SHORT_POINTER:
                    *a.arg[dp->arg_index].a.a_count_short_pointer = length;
                    break;
                  case TYPE_COUNT_INT_POINTER:
                    *a.arg[dp->arg_index].a.a_count_int_pointer = length;
                    break;
                  case TYPE_COUNT_LONGINT_POINTER:
                    *a.arg[dp->arg_index].a.a_count_longint_pointer = length;
                    break;
#if HAVE_LONG_LONG_INT
                  case TYPE_COUNT_LONGLONGINT_POINTER:
                    *a.arg[dp->arg_index].a.a_count_longlongint_pointer = length;
                    break;
#endif
                  default:
                    abort ();
                  }
              }
#if ENABLE_UNISTDIO
            /* The unistdio extensions.  */
            else if (dp->conversion == 'U')
              {
                arg_type type = a.arg[dp->arg_index].type;
                int flags = dp->flags;
                int has_width;
                size_t width;
                int has_precision;
                size_t precision;

                has_width = 0;
                width = 0;
                if (dp->width_start != dp->width_end)
                  {
                    if (dp->width_arg_index != ARG_NONE)
                      {
                        int arg;

                        if (!(a.arg[dp->width_arg_index].type == TYPE_INT))
                          abort ();
                        arg = a.arg[dp->width_arg_index].a.a_int;
                        width = arg;
                        if (arg < 0)
                          {
                            /* "A negative field width is taken as a '-' flag
                                followed by a positive field width."  */
                            flags |= FLAG_LEFT;
                            width = -width;
                          }
                      }
                    else
                      {
                        const FCHAR_T *digitp = dp->width_start;

                        do
                          width = xsum (xtimes (width, 10), *digitp++ - '0');
                        while (digitp != dp->width_end);
                      }
                    has_width = 1;
                  }

                has_precision = 0;
                precision = 0;
                if (dp->precision_start != dp->precision_end)
                  {
                    if (dp->precision_arg_index != ARG_NONE)
                      {
                        int arg;

                        if (!(a.arg[dp->precision_arg_index].type == TYPE_INT))
                          abort ();
                        arg = a.arg[dp->precision_arg_index].a.a_int;
                        /* "A negative precision is taken as if the precision
                            were omitted."  */
                        if (arg >= 0)
                          {
                            precision = arg;
                            has_precision = 1;
                          }
                      }
                    else
                      {
                        const FCHAR_T *digitp = dp->precision_start + 1;

                        precision = 0;
                        while (digitp != dp->precision_end)
                          precision = xsum (xtimes (precision, 10), *digitp++ - '0');
                        has_precision = 1;
                      }
                  }

                switch (type)
                  {
                  case TYPE_U8_STRING:
                    {
                      const uint8_t *arg = a.arg[dp->arg_index].a.a_u8_string;
                      const uint8_t *arg_end;
                      size_t characters;

                      if (has_precision)
                        {
                          /* Use only PRECISION characters, from the left.  */
                          arg_end = arg;
                          characters = 0;
                          for (; precision > 0; precision--)
                            {
                              int count = u8_strmblen (arg_end);
                              if (count == 0)
                                break;
                              if (count < 0)
                                {
                                  if (!(result == resultbuf || result == NULL))
                                    free (result);
                                  if (buf_malloced != NULL)
                                    free (buf_malloced);
                                  CLEANUP ();
                                  errno = EILSEQ;
                                  return NULL;
                                }
                              arg_end += count;
                              characters++;
                            }
                        }
                      else if (has_width)
                        {
                          /* Use the entire string, and count the number of
                             characters.  */
                          arg_end = arg;
                          characters = 0;
                          for (;;)
                            {
                              int count = u8_strmblen (arg_end);
                              if (count == 0)
                                break;
                              if (count < 0)
                                {
                                  if (!(result == resultbuf || result == NULL))
                                    free (result);
                                  if (buf_malloced != NULL)
                                    free (buf_malloced);
                                  CLEANUP ();
                                  errno = EILSEQ;
                                  return NULL;
                                }
                              arg_end += count;
                              characters++;
                            }
                        }
                      else
                        {
                          /* Use the entire string.  */
                          arg_end = arg + u8_strlen (arg);
                          /* The number of characters doesn't matter.  */
                          characters = 0;
                        }

                      if (characters < width && !(dp->flags & FLAG_LEFT))
                        {
                          size_t n = width - characters;
                          ENSURE_ALLOCATION (xsum (length, n));
                          DCHAR_SET (result + length, ' ', n);
                          length += n;
                        }

# if DCHAR_IS_UINT8_T
                      {
                        size_t n = arg_end - arg;
                        ENSURE_ALLOCATION (xsum (length, n));
                        DCHAR_CPY (result + length, arg, n);
                        length += n;
                      }
# else
                      { /* Convert.  */
                        DCHAR_T *converted = result + length;
                        size_t converted_len = allocated - length;
#  if DCHAR_IS_TCHAR
                        /* Convert from UTF-8 to locale encoding.  */
                        converted =
                          u8_conv_to_encoding (locale_charset (),
                                               iconveh_question_mark,
                                               arg, arg_end - arg, NULL,
                                               converted, &converted_len);
#  else
                        /* Convert from UTF-8 to UTF-16/UTF-32.  */
                        converted =
                          U8_TO_DCHAR (arg, arg_end - arg,
                                       converted, &converted_len);
#  endif
                        if (converted == NULL)
                          {
                            int saved_errno = errno;
                            if (!(result == resultbuf || result == NULL))
                              free (result);
                            if (buf_malloced != NULL)
                              free (buf_malloced);
                            CLEANUP ();
                            errno = saved_errno;
                            return NULL;
                          }
                        if (converted != result + length)
                          {
                            ENSURE_ALLOCATION (xsum (length, converted_len));
                            DCHAR_CPY (result + length, converted, converted_len);
                            free (converted);
                          }
                        length += converted_len;
                      }
# endif

                      if (characters < width && (dp->flags & FLAG_LEFT))
                        {
                          size_t n = width - characters;
                          ENSURE_ALLOCATION (xsum (length, n));
                          DCHAR_SET (result + length, ' ', n);
                          length += n;
                        }
                    }
                    break;

                  case TYPE_U16_STRING:
                    {
                      const uint16_t *arg = a.arg[dp->arg_index].a.a_u16_string;
                      const uint16_t *arg_end;
                      size_t characters;

                      if (has_precision)
                        {
                          /* Use only PRECISION characters, from the left.  */
                          arg_end = arg;
                          characters = 0;
                          for (; precision > 0; precision--)
                            {
                              int count = u16_strmblen (arg_end);
                              if (count == 0)
                                break;
                              if (count < 0)
                                {
                                  if (!(result == resultbuf || result == NULL))
                                    free (result);
                                  if (buf_malloced != NULL)
                                    free (buf_malloced);
                                  CLEANUP ();
                                  errno = EILSEQ;
                                  return NULL;
                                }
                              arg_end += count;
                              characters++;
                            }
                        }
                      else if (has_width)
                        {
                          /* Use the entire string, and count the number of
                             characters.  */
                          arg_end = arg;
                          characters = 0;
                          for (;;)
                            {
                              int count = u16_strmblen (arg_end);
                              if (count == 0)
                                break;
                              if (count < 0)
                                {
                                  if (!(result == resultbuf || result == NULL))
                                    free (result);
                                  if (buf_malloced != NULL)
                                    free (buf_malloced);
                                  CLEANUP ();
                                  errno = EILSEQ;
                                  return NULL;
                                }
                              arg_end += count;
                              characters++;
                            }
                        }
                      else
                        {
                          /* Use the entire string.  */
                          arg_end = arg + u16_strlen (arg);
                          /* The number of characters doesn't matter.  */
                          characters = 0;
                        }

                      if (characters < width && !(dp->flags & FLAG_LEFT))
                        {
                          size_t n = width - characters;
                          ENSURE_ALLOCATION (xsum (length, n));
                          DCHAR_SET (result + length, ' ', n);
                          length += n;
                        }

# if DCHAR_IS_UINT16_T
                      {
                        size_t n = arg_end - arg;
                        ENSURE_ALLOCATION (xsum (length, n));
                        DCHAR_CPY (result + length, arg, n);
                        length += n;
                      }
# else
                      { /* Convert.  */
                        DCHAR_T *converted = result + length;
                        size_t converted_len = allocated - length;
#  if DCHAR_IS_TCHAR
                        /* Convert from UTF-16 to locale encoding.  */
                        converted =
                          u16_conv_to_encoding (locale_charset (),
                                                iconveh_question_mark,
                                                arg, arg_end - arg, NULL,
                                                converted, &converted_len);
#  else
                        /* Convert from UTF-16 to UTF-8/UTF-32.  */
                        converted =
                          U16_TO_DCHAR (arg, arg_end - arg,
                                        converted, &converted_len);
#  endif
                        if (converted == NULL)
                          {
                            int saved_errno = errno;
                            if (!(result == resultbuf || result == NULL))
                              free (result);
                            if (buf_malloced != NULL)
                              free (buf_malloced);
                            CLEANUP ();
                            errno = saved_errno;
                            return NULL;
                          }
                        if (converted != result + length)
                          {
                            ENSURE_ALLOCATION (xsum (length, converted_len));
                            DCHAR_CPY (result + length, converted, converted_len);
                            free (converted);
                          }
                        length += converted_len;
                      }
# endif

                      if (characters < width && (dp->flags & FLAG_LEFT))
                        {
                          size_t n = width - characters;
                          ENSURE_ALLOCATION (xsum (length, n));
                          DCHAR_SET (result + length, ' ', n);
                          length += n;
                        }
                    }
                    break;

                  case TYPE_U32_STRING:
                    {
                      const uint32_t *arg = a.arg[dp->arg_index].a.a_u32_string;
                      const uint32_t *arg_end;
                      size_t characters;

                      if (has_precision)
                        {
                          /* Use only PRECISION characters, from the left.  */
                          arg_end = arg;
                          characters = 0;
                          for (; precision > 0; precision--)
                            {
                              int count = u32_strmblen (arg_end);
                              if (count == 0)
                                break;
                              if (count < 0)
                                {
                                  if (!(result == resultbuf || result == NULL))
                                    free (result);
                                  if (buf_malloced != NULL)
                                    free (buf_malloced);
                                  CLEANUP ();
                                  errno = EILSEQ;
                                  return NULL;
                                }
                              arg_end += count;
                              characters++;
                            }
                        }
                      else if (has_width)
                        {
                          /* Use the entire string, and count the number of
                             characters.  */
                          arg_end = arg;
                          characters = 0;
                          for (;;)
                            {
                              int count = u32_strmblen (arg_end);
                              if (count == 0)
                                break;
                              if (count < 0)
                                {
                                  if (!(result == resultbuf || result == NULL))
                                    free (result);
                                  if (buf_malloced != NULL)
                                    free (buf_malloced);
                                  CLEANUP ();
                                  errno = EILSEQ;
                                  return NULL;
                                }
                              arg_end += count;
                              characters++;
                            }
                        }
                      else
                        {
                          /* Use the entire string.  */
                          arg_end = arg + u32_strlen (arg);
                          /* The number of characters doesn't matter.  */
                          characters = 0;
                        }

                      if (characters < width && !(dp->flags & FLAG_LEFT))
                        {
                          size_t n = width - characters;
                          ENSURE_ALLOCATION (xsum (length, n));
                          DCHAR_SET (result + length, ' ', n);
                          length += n;
                        }

# if DCHAR_IS_UINT32_T
                      {
                        size_t n = arg_end - arg;
                        ENSURE_ALLOCATION (xsum (length, n));
                        DCHAR_CPY (result + length, arg, n);
                        length += n;
                      }
# else
                      { /* Convert.  */
                        DCHAR_T *converted = result + length;
                        size_t converted_len = allocated - length;
#  if DCHAR_IS_TCHAR
                        /* Convert from UTF-32 to locale encoding.  */
                        converted =
                          u32_conv_to_encoding (locale_charset (),
                                                iconveh_question_mark,
                                                arg, arg_end - arg, NULL,
                                                converted, &converted_len);
#  else
                        /* Convert from UTF-32 to UTF-8/UTF-16.  */
                        converted =
                          U32_TO_DCHAR (arg, arg_end - arg,
                                        converted, &converted_len);
#  endif
                        if (converted == NULL)
                          {
                            int saved_errno = errno;
                            if (!(result == resultbuf || result == NULL))
                              free (result);
                            if (buf_malloced != NULL)
                              free (buf_malloced);
                            CLEANUP ();
                            errno = saved_errno;
                            return NULL;
                          }
                        if (converted != result + length)
                          {
                            ENSURE_ALLOCATION (xsum (length, converted_len));
                            DCHAR_CPY (result + length, converted, converted_len);
                            free (converted);
                          }
                        length += converted_len;
                      }
# endif

                      if (characters < width && (dp->flags & FLAG_LEFT))
                        {
                          size_t n = width - characters;
                          ENSURE_ALLOCATION (xsum (length, n));
                          DCHAR_SET (result + length, ' ', n);
                          length += n;
                        }
                    }
                    break;

                  default:
                    abort ();
                  }
              }
#endif
#if (!USE_SNPRINTF || !HAVE_SNPRINTF_RETVAL_C99 || USE_MSVC__SNPRINTF || (NEED_PRINTF_DIRECTIVE_LS && !defined IN_LIBINTL)) && HAVE_WCHAR_T
            else if (dp->conversion == 's'
# if WIDE_CHAR_VERSION
                     && a.arg[dp->arg_index].type != TYPE_WIDE_STRING
# else
                     && a.arg[dp->arg_index].type == TYPE_WIDE_STRING
# endif
                    )
              {
                /* The normal handling of the 's' directive below requires
                   allocating a temporary buffer.  The determination of its
                   length (tmp_length), in the case when a precision is
                   specified, below requires a conversion between a char[]
                   string and a wchar_t[] wide string.  It could be done, but
                   we have no guarantee that the implementation of sprintf will
                   use the exactly same algorithm.  Without this guarantee, it
                   is possible to have buffer overrun bugs.  In order to avoid
                   such bugs, we implement the entire processing of the 's'
                   directive ourselves.  */
                int flags = dp->flags;
                int has_width;
                size_t width;
                int has_precision;
                size_t precision;

                has_width = 0;
                width = 0;
                if (dp->width_start != dp->width_end)
                  {
                    if (dp->width_arg_index != ARG_NONE)
                      {
                        int arg;

                        if (!(a.arg[dp->width_arg_index].type == TYPE_INT))
                          abort ();
                        arg = a.arg[dp->width_arg_index].a.a_int;
                        width = arg;
                        if (arg < 0)
                          {
                            /* "A negative field width is taken as a '-' flag
                                followed by a positive field width."  */
                            flags |= FLAG_LEFT;
                            width = -width;
                          }
                      }
                    else
                      {
                        const FCHAR_T *digitp = dp->width_start;

                        do
                          width = xsum (xtimes (width, 10), *digitp++ - '0');
                        while (digitp != dp->width_end);
                      }
                    has_width = 1;
                  }

                has_precision = 0;
                precision = 6;
                if (dp->precision_start != dp->precision_end)
                  {
                    if (dp->precision_arg_index != ARG_NONE)
                      {
                        int arg;

                        if (!(a.arg[dp->precision_arg_index].type == TYPE_INT))
                          abort ();
                        arg = a.arg[dp->precision_arg_index].a.a_int;
                        /* "A negative precision is taken as if the precision
                            were omitted."  */
                        if (arg >= 0)
                          {
                            precision = arg;
                            has_precision = 1;
                          }
                      }
                    else
                      {
                        const FCHAR_T *digitp = dp->precision_start + 1;

                        precision = 0;
                        while (digitp != dp->precision_end)
                          precision = xsum (xtimes (precision, 10), *digitp++ - '0');
                        has_precision = 1;
                      }
                  }

# if WIDE_CHAR_VERSION
                /* %s in vasnwprintf.  See the specification of fwprintf.  */
                {
                  const char *arg = a.arg[dp->arg_index].a.a_string;
                  const char *arg_end;
                  size_t characters;

                  if (has_precision)
                    {
                      /* Use only as many bytes as needed to produce PRECISION
                         wide characters, from the left.  */
#  if HAVE_MBRTOWC
                      mbstate_t state;
                      memset (&state, '\0', sizeof (mbstate_t));
#  endif
                      arg_end = arg;
                      characters = 0;
                      for (; precision > 0; precision--)
                        {
                          int count;
#  if HAVE_MBRTOWC
                          count = mbrlen (arg_end, MB_CUR_MAX, &state);
#  else
                          count = mblen (arg_end, MB_CUR_MAX);
#  endif
                          if (count == 0)
                            /* Found the terminating NUL.  */
                            break;
                          if (count < 0)
                            {
                              /* Invalid or incomplete multibyte character.  */
                              if (!(result == resultbuf || result == NULL))
                                free (result);
                              if (buf_malloced != NULL)
                                free (buf_malloced);
                              CLEANUP ();
                              errno = EILSEQ;
                              return NULL;
                            }
                          arg_end += count;
                          characters++;
                        }
                    }
                  else if (has_width)
                    {
                      /* Use the entire string, and count the number of wide
                         characters.  */
#  if HAVE_MBRTOWC
                      mbstate_t state;
                      memset (&state, '\0', sizeof (mbstate_t));
#  endif
                      arg_end = arg;
                      characters = 0;
                      for (;;)
                        {
                          int count;
#  if HAVE_MBRTOWC
                          count = mbrlen (arg_end, MB_CUR_MAX, &state);
#  else
                          count = mblen (arg_end, MB_CUR_MAX);
#  endif
                          if (count == 0)
                            /* Found the terminating NUL.  */
                            break;
                          if (count < 0)
                            {
                              /* Invalid or incomplete multibyte character.  */
                              if (!(result == resultbuf || result == NULL))
                                free (result);
                              if (buf_malloced != NULL)
                                free (buf_malloced);
                              CLEANUP ();
                              errno = EILSEQ;
                              return NULL;
                            }
                          arg_end += count;
                          characters++;
                        }
                    }
                  else
                    {
                      /* Use the entire string.  */
                      arg_end = arg + strlen (arg);
                      /* The number of characters doesn't matter.  */
                      characters = 0;
                    }

                  if (characters < width && !(dp->flags & FLAG_LEFT))
                    {
                      size_t n = width - characters;
                      ENSURE_ALLOCATION (xsum (length, n));
                      DCHAR_SET (result + length, ' ', n);
                      length += n;
                    }

                  if (has_precision || has_width)
                    {
                      /* We know the number of wide characters in advance.  */
                      size_t remaining;
#  if HAVE_MBRTOWC
                      mbstate_t state;
                      memset (&state, '\0', sizeof (mbstate_t));
#  endif
                      ENSURE_ALLOCATION (xsum (length, characters));
                      for (remaining = characters; remaining > 0; remaining--)
                        {
                          wchar_t wc;
                          int count;
#  if HAVE_MBRTOWC
                          count = mbrtowc (&wc, arg, arg_end - arg, &state);
#  else
                          count = mbtowc (&wc, arg, arg_end - arg);
#  endif
                          if (count <= 0)
                            /* mbrtowc not consistent with mbrlen, or mbtowc
                               not consistent with mblen.  */
                            abort ();
                          result[length++] = wc;
                          arg += count;
                        }
                      if (!(arg == arg_end))
                        abort ();
                    }
                  else
                    {
#  if HAVE_MBRTOWC
                      mbstate_t state;
                      memset (&state, '\0', sizeof (mbstate_t));
#  endif
                      while (arg < arg_end)
                        {
                          wchar_t wc;
                          int count;
#  if HAVE_MBRTOWC
                          count = mbrtowc (&wc, arg, arg_end - arg, &state);
#  else
                          count = mbtowc (&wc, arg, arg_end - arg);
#  endif
                          if (count <= 0)
                            /* mbrtowc not consistent with mbrlen, or mbtowc
                               not consistent with mblen.  */
                            abort ();
                          ENSURE_ALLOCATION (xsum (length, 1));
                          result[length++] = wc;
                          arg += count;
                        }
                    }

                  if (characters < width && (dp->flags & FLAG_LEFT))
                    {
                      size_t n = width - characters;
                      ENSURE_ALLOCATION (xsum (length, n));
                      DCHAR_SET (result + length, ' ', n);
                      length += n;
                    }
                }
# else
                /* %ls in vasnprintf.  See the specification of fprintf.  */
                {
                  const wchar_t *arg = a.arg[dp->arg_index].a.a_wide_string;
                  const wchar_t *arg_end;
                  size_t characters;
#  if !DCHAR_IS_TCHAR
                  /* This code assumes that TCHAR_T is 'char'.  */
                  verify (sizeof (TCHAR_T) == 1);
                  TCHAR_T *tmpsrc;
                  DCHAR_T *tmpdst;
                  size_t tmpdst_len;
#  endif
                  size_t w;

                  if (has_precision)
                    {
                      /* Use only as many wide characters as needed to produce
                         at most PRECISION bytes, from the left.  */
#  if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
                      mbstate_t state;
                      memset (&state, '\0', sizeof (mbstate_t));
#  endif
                      arg_end = arg;
                      characters = 0;
                      while (precision > 0)
                        {
                          char cbuf[64]; /* Assume MB_CUR_MAX <= 64.  */
                          int count;

                          if (*arg_end == 0)
                            /* Found the terminating null wide character.  */
                            break;
#  if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
                          count = wcrtomb (cbuf, *arg_end, &state);
#  else
                          count = wctomb (cbuf, *arg_end);
#  endif
                          if (count < 0)
                            {
                              /* Cannot convert.  */
                              if (!(result == resultbuf || result == NULL))
                                free (result);
                              if (buf_malloced != NULL)
                                free (buf_malloced);
                              CLEANUP ();
                              errno = EILSEQ;
                              return NULL;
                            }
                          if (precision < count)
                            break;
                          arg_end++;
                          characters += count;
                          precision -= count;
                        }
                    }
#  if DCHAR_IS_TCHAR
                  else if (has_width)
#  else
                  else
#  endif
                    {
                      /* Use the entire string, and count the number of
                         bytes.  */
#  if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
                      mbstate_t state;
                      memset (&state, '\0', sizeof (mbstate_t));
#  endif
                      arg_end = arg;
                      characters = 0;
                      for (;;)
                        {
                          char cbuf[64]; /* Assume MB_CUR_MAX <= 64.  */
                          int count;

                          if (*arg_end == 0)
                            /* Found the terminating null wide character.  */
                            break;
#  if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
                          count = wcrtomb (cbuf, *arg_end, &state);
#  else
                          count = wctomb (cbuf, *arg_end);
#  endif
                          if (count < 0)
                            {
                              /* Cannot convert.  */
                              if (!(result == resultbuf || result == NULL))
                                free (result);
                              if (buf_malloced != NULL)
                                free (buf_malloced);
                              CLEANUP ();
                              errno = EILSEQ;
                              return NULL;
                            }
                          arg_end++;
                          characters += count;
                        }
                    }
#  if DCHAR_IS_TCHAR
                  else
                    {
                      /* Use the entire string.  */
                      arg_end = arg + local_wcslen (arg);
                      /* The number of bytes doesn't matter.  */
                      characters = 0;
                    }
#  endif

#  if !DCHAR_IS_TCHAR
                  /* Convert the string into a piece of temporary memory.  */
                  tmpsrc = (TCHAR_T *) malloc (characters * sizeof (TCHAR_T));
                  if (tmpsrc == NULL)
                    goto out_of_memory;
                  {
                    TCHAR_T *tmpptr = tmpsrc;
                    size_t remaining;
#   if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
                    mbstate_t state;
                    memset (&state, '\0', sizeof (mbstate_t));
#   endif
                    for (remaining = characters; remaining > 0; )
                      {
                        char cbuf[64]; /* Assume MB_CUR_MAX <= 64.  */
                        int count;

                        if (*arg == 0)
                          abort ();
#   if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
                        count = wcrtomb (cbuf, *arg, &state);
#   else
                        count = wctomb (cbuf, *arg);
#   endif
                        if (count <= 0)
                          /* Inconsistency.  */
                          abort ();
                        memcpy (tmpptr, cbuf, count);
                        tmpptr += count;
                        arg++;
                        remaining -= count;
                      }
                    if (!(arg == arg_end))
                      abort ();
                  }

                  /* Convert from TCHAR_T[] to DCHAR_T[].  */
                  tmpdst =
                    DCHAR_CONV_FROM_ENCODING (locale_charset (),
                                              iconveh_question_mark,
                                              tmpsrc, characters,
                                              NULL,
                                              NULL, &tmpdst_len);
                  if (tmpdst == NULL)
                    {
                      int saved_errno = errno;
                      free (tmpsrc);
                      if (!(result == resultbuf || result == NULL))
                        free (result);
                      if (buf_malloced != NULL)
                        free (buf_malloced);
                      CLEANUP ();
                      errno = saved_errno;
                      return NULL;
                    }
                  free (tmpsrc);
#  endif

                  if (has_width)
                    {
#  if ENABLE_UNISTDIO
                      /* Outside POSIX, it's preferable to compare the width
                         against the number of _characters_ of the converted
                         value.  */
                      w = DCHAR_MBSNLEN (result + length, characters);
#  else
                      /* The width is compared against the number of _bytes_
                         of the converted value, says POSIX.  */
                      w = characters;
#  endif
                    }
                  else
                    /* w doesn't matter.  */
                    w = 0;

                  if (w < width && !(dp->flags & FLAG_LEFT))
                    {
                      size_t n = width - w;
                      ENSURE_ALLOCATION (xsum (length, n));
                      DCHAR_SET (result + length, ' ', n);
                      length += n;
                    }

#  if DCHAR_IS_TCHAR
                  if (has_precision || has_width)
                    {
                      /* We know the number of bytes in advance.  */
                      size_t remaining;
#   if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
                      mbstate_t state;
                      memset (&state, '\0', sizeof (mbstate_t));
#   endif
                      ENSURE_ALLOCATION (xsum (length, characters));
                      for (remaining = characters; remaining > 0; )
                        {
                          char cbuf[64]; /* Assume MB_CUR_MAX <= 64.  */
                          int count;

                          if (*arg == 0)
                            abort ();
#   if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
                          count = wcrtomb (cbuf, *arg, &state);
#   else
                          count = wctomb (cbuf, *arg);
#   endif
                          if (count <= 0)
                            /* Inconsistency.  */
                            abort ();
                          memcpy (result + length, cbuf, count);
                          length += count;
                          arg++;
                          remaining -= count;
                        }
                      if (!(arg == arg_end))
                        abort ();
                    }
                  else
                    {
#   if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
                      mbstate_t state;
                      memset (&state, '\0', sizeof (mbstate_t));
#   endif
                      while (arg < arg_end)
                        {
                          char cbuf[64]; /* Assume MB_CUR_MAX <= 64.  */
                          int count;

                          if (*arg == 0)
                            abort ();
#   if HAVE_WCRTOMB && !defined GNULIB_defined_mbstate_t
                          count = wcrtomb (cbuf, *arg, &state);
#   else
                          count = wctomb (cbuf, *arg);
#   endif
                          if (count <= 0)
                            {
                              /* Cannot convert.  */
                              if (!(result == resultbuf || result == NULL))
                                free (result);
                              if (buf_malloced != NULL)
                                free (buf_malloced);
                              CLEANUP ();
                              errno = EILSEQ;
                              return NULL;
                            }
                          ENSURE_ALLOCATION (xsum (length, count));
                          memcpy (result + length, cbuf, count);
                          length += count;
                          arg++;
                        }
                    }
#  else
                  ENSURE_ALLOCATION (xsum (length, tmpdst_len));
                  DCHAR_CPY (result + length, tmpdst, tmpdst_len);
                  free (tmpdst);
                  length += tmpdst_len;
#  endif

                  if (w < width && (dp->flags & FLAG_LEFT))
                    {
                      size_t n = width - w;
                      ENSURE_ALLOCATION (xsum (length, n));
                      DCHAR_SET (result + length, ' ', n);
                      length += n;
                    }
                }
# endif
              }
#endif
#if (NEED_PRINTF_DIRECTIVE_A || NEED_PRINTF_LONG_DOUBLE || NEED_PRINTF_DOUBLE) && !defined IN_LIBINTL
            else if ((dp->conversion == 'a' || dp->conversion == 'A')
# if !(NEED_PRINTF_DIRECTIVE_A || (NEED_PRINTF_LONG_DOUBLE && NEED_PRINTF_DOUBLE))
                     && (0
#  if NEED_PRINTF_DOUBLE
                         || a.arg[dp->arg_index].type == TYPE_DOUBLE
#  endif
#  if NEED_PRINTF_LONG_DOUBLE
                         || a.arg[dp->arg_index].type == TYPE_LONGDOUBLE
#  endif
                        )
# endif
                    )
              {
                arg_type type = a.arg[dp->arg_index].type;
                int flags = dp->flags;
                size_t width;
                int has_precision;
                size_t precision;
                size_t tmp_length;
                size_t count;
                DCHAR_T tmpbuf[700];
                DCHAR_T *tmp;
                DCHAR_T *pad_ptr;
                DCHAR_T *p;

                width = 0;
                if (dp->width_start != dp->width_end)
                  {
                    if (dp->width_arg_index != ARG_NONE)
                      {
                        int arg;

                        if (!(a.arg[dp->width_arg_index].type == TYPE_INT))
                          abort ();
                        arg = a.arg[dp->width_arg_index].a.a_int;
                        width = arg;
                        if (arg < 0)
                          {
                            /* "A negative field width is taken as a '-' flag
                                followed by a positive field width."  */
                            flags |= FLAG_LEFT;
                            width = -width;
                          }
                      }
                    else
                      {
                        const FCHAR_T *digitp = dp->width_start;

                        do
                          width = xsum (xtimes (width, 10), *digitp++ - '0');
                        while (digitp != dp->width_end);
                      }
                  }

                has_precision = 0;
                precision = 0;
                if (dp->precision_start != dp->precision_end)
                  {
                    if (dp->precision_arg_index != ARG_NONE)
                      {
                        int arg;

                        if (!(a.arg[dp->precision_arg_index].type == TYPE_INT))
                          abort ();
                        arg = a.arg[dp->precision_arg_index].a.a_int;
                        /* "A negative precision is taken as if the precision
                            were omitted."  */
                        if (arg >= 0)
                          {
                            precision = arg;
                            has_precision = 1;
                          }
                      }
                    else
                      {
                        const FCHAR_T *digitp = dp->precision_start + 1;

                        precision = 0;
                        while (digitp != dp->precision_end)
                          precision = xsum (xtimes (precision, 10), *digitp++ - '0');
                        has_precision = 1;
                      }
                  }

                /* Allocate a temporary buffer of sufficient size.  */
                if (type == TYPE_LONGDOUBLE)
                  tmp_length =
                    (unsigned int) ((LDBL_DIG + 1)
                                    * 0.831 /* decimal -> hexadecimal */
                                   )
                    + 1; /* turn floor into ceil */
                else
                  tmp_length =
                    (unsigned int) ((DBL_DIG + 1)
                                    * 0.831 /* decimal -> hexadecimal */
                                   )
                    + 1; /* turn floor into ceil */
                if (tmp_length < precision)
                  tmp_length = precision;
                /* Account for sign, decimal point etc. */
                tmp_length = xsum (tmp_length, 12);

                if (tmp_length < width)
                  tmp_length = width;

                tmp_length = xsum (tmp_length, 1); /* account for trailing NUL */

                if (tmp_length <= sizeof (tmpbuf) / sizeof (DCHAR_T))
                  tmp = tmpbuf;
                else
                  {
                    size_t tmp_memsize = xtimes (tmp_length, sizeof (DCHAR_T));

                    if (size_overflow_p (tmp_memsize))
                      /* Overflow, would lead to out of memory.  */
                      goto out_of_memory;
                    tmp = (DCHAR_T *) malloc (tmp_memsize);
                    if (tmp == NULL)
                      /* Out of memory.  */
                      goto out_of_memory;
                  }

                pad_ptr = NULL;
                p = tmp;
                if (type == TYPE_LONGDOUBLE)
                  {
# if NEED_PRINTF_DIRECTIVE_A || NEED_PRINTF_LONG_DOUBLE
                    long double arg = a.arg[dp->arg_index].a.a_longdouble;

                    if (isnanl (arg))
                      {
                        if (dp->conversion == 'A')
                          {
                            *p++ = 'N'; *p++ = 'A'; *p++ = 'N';
                          }
                        else
                          {
                            *p++ = 'n'; *p++ = 'a'; *p++ = 'n';
                          }
                      }
                    else
                      {
                        int sign = 0;
                        DECL_LONG_DOUBLE_ROUNDING

                        BEGIN_LONG_DOUBLE_ROUNDING ();

                        if (signbit (arg)) /* arg < 0.0L or negative zero */
                          {
                            sign = -1;
                            arg = -arg;
                          }

                        if (sign < 0)
                          *p++ = '-';
                        else if (flags & FLAG_SHOWSIGN)
                          *p++ = '+';
                        else if (flags & FLAG_SPACE)
                          *p++ = ' ';

                        if (arg > 0.0L && arg + arg == arg)
                          {
                            if (dp->conversion == 'A')
                              {
                                *p++ = 'I'; *p++ = 'N'; *p++ = 'F';
                              }
                            else
                              {
                                *p++ = 'i'; *p++ = 'n'; *p++ = 'f';
                              }
                          }
                        else
                          {
                            int exponent;
                            long double mantissa;

                            if (arg > 0.0L)
                              mantissa = printf_frexpl (arg, &exponent);
                            else
                              {
                                exponent = 0;
                                mantissa = 0.0L;
                              }

                            if (has_precision
                                && precision < (unsigned int) ((LDBL_DIG + 1) * 0.831) + 1)
                              {
                                /* Round the mantissa.  */
                                long double tail = mantissa;
                                size_t q;

                                for (q = precision; ; q--)
                                  {
                                    int digit = (int) tail;
                                    tail -= digit;
                                    if (q == 0)
                                      {
                                        if (digit & 1 ? tail >= 0.5L : tail > 0.5L)
                                          tail = 1 - tail;
                                        else
                                          tail = - tail;
                                        break;
                                      }
                                    tail *= 16.0L;
                                  }
                                if (tail != 0.0L)
                                  for (q = precision; q > 0; q--)
                                    tail *= 0.0625L;
                                mantissa += tail;
                              }

                            *p++ = '0';
                            *p++ = dp->conversion - 'A' + 'X';
                            pad_ptr = p;
                            {
                              int digit;

                              digit = (int) mantissa;
                              mantissa -= digit;
                              *p++ = '0' + digit;
                              if ((flags & FLAG_ALT)
                                  || mantissa > 0.0L || precision > 0)
                                {
                                  *p++ = decimal_point_char ();
                                  /* This loop terminates because we assume
                                     that FLT_RADIX is a power of 2.  */
                                  while (mantissa > 0.0L)
                                    {
                                      mantissa *= 16.0L;
                                      digit = (int) mantissa;
                                      mantissa -= digit;
                                      *p++ = digit
                                             + (digit < 10
                                                ? '0'
                                                : dp->conversion - 10);
                                      if (precision > 0)
                                        precision--;
                                    }
                                  while (precision > 0)
                                    {
                                      *p++ = '0';
                                      precision--;
                                    }
                                }
                              }
                              *p++ = dp->conversion - 'A' + 'P';
#  if WIDE_CHAR_VERSION
                              {
                                static const wchar_t decimal_format[] =
                                  { '%', '+', 'd', '\0' };
                                SNPRINTF (p, 6 + 1, decimal_format, exponent);
                              }
                              while (*p != '\0')
                                p++;
#  else
                              if (sizeof (DCHAR_T) == 1)
                                {
                                  sprintf ((char *) p, "%+d", exponent);
                                  while (*p != '\0')
                                    p++;
                                }
                              else
                                {
                                  char expbuf[6 + 1];
                                  const char *ep;
                                  sprintf (expbuf, "%+d", exponent);
                                  for (ep = expbuf; (*p = *ep) != '\0'; ep++)
                                    p++;
                                }
#  endif
                          }

                        END_LONG_DOUBLE_ROUNDING ();
                      }
# else
                    abort ();
# endif
                  }
                else
                  {
# if NEED_PRINTF_DIRECTIVE_A || NEED_PRINTF_DOUBLE
                    double arg = a.arg[dp->arg_index].a.a_double;

                    if (isnand (arg))
                      {
                        if (dp->conversion == 'A')
                          {
                            *p++ = 'N'; *p++ = 'A'; *p++ = 'N';
                          }
                        else
                          {
                            *p++ = 'n'; *p++ = 'a'; *p++ = 'n';
                          }
                      }
                    else
                      {
                        int sign = 0;

                        if (signbit (arg)) /* arg < 0.0 or negative zero */
                          {
                            sign = -1;
                            arg = -arg;
                          }

                        if (sign < 0)
                          *p++ = '-';
                        else if (flags & FLAG_SHOWSIGN)
                          *p++ = '+';
                        else if (flags & FLAG_SPACE)
                          *p++ = ' ';

                        if (arg > 0.0 && arg + arg == arg)
                          {
                            if (dp->conversion == 'A')
                              {
                                *p++ = 'I'; *p++ = 'N'; *p++ = 'F';
                              }
                            else
                              {
                                *p++ = 'i'; *p++ = 'n'; *p++ = 'f';
                              }
                          }
                        else
                          {
                            int exponent;
                            double mantissa;

                            if (arg > 0.0)
                              mantissa = printf_frexp (arg, &exponent);
                            else
                              {
                                exponent = 0;
                                mantissa = 0.0;
                              }

                            if (has_precision
                                && precision < (unsigned int) ((DBL_DIG + 1) * 0.831) + 1)
                              {
                                /* Round the mantissa.  */
                                double tail = mantissa;
                                size_t q;

                                for (q = precision; ; q--)
                                  {
                                    int digit = (int) tail;
                                    tail -= digit;
                                    if (q == 0)
                                      {
                                        if (digit & 1 ? tail >= 0.5 : tail > 0.5)
                                          tail = 1 - tail;
                                        else
                                          tail = - tail;
                                        break;
                                      }
                                    tail *= 16.0;
                                  }
                                if (tail != 0.0)
                                  for (q = precision; q > 0; q--)
                                    tail *= 0.0625;
                                mantissa += tail;
                              }

                            *p++ = '0';
                            *p++ = dp->conversion - 'A' + 'X';
                            pad_ptr = p;
                            {
                              int digit;

                              digit = (int) mantissa;
                              mantissa -= digit;
                              *p++ = '0' + digit;
                              if ((flags & FLAG_ALT)
                                  || mantissa > 0.0 || precision > 0)
                                {
                                  *p++ = decimal_point_char ();
                                  /* This loop terminates because we assume
                                     that FLT_RADIX is a power of 2.  */
                                  while (mantissa > 0.0)
                                    {
                                      mantissa *= 16.0;
                                      digit = (int) mantissa;
                                      mantissa -= digit;
                                      *p++ = digit
                                             + (digit < 10
                                                ? '0'
                                                : dp->conversion - 10);
                                      if (precision > 0)
                                        precision--;
                                    }
                                  while (precision > 0)
                                    {
                                      *p++ = '0';
                                      precision--;
                                    }
                                }
                              }
                              *p++ = dp->conversion - 'A' + 'P';
#  if WIDE_CHAR_VERSION
                              {
                                static const wchar_t decimal_format[] =
                                  { '%', '+', 'd', '\0' };
                                SNPRINTF (p, 6 + 1, decimal_format, exponent);
                              }
                              while (*p != '\0')
                                p++;
#  else
                              if (sizeof (DCHAR_T) == 1)
                                {
                                  sprintf ((char *) p, "%+d", exponent);
                                  while (*p != '\0')
                                    p++;
                                }
                              else
                                {
                                  char expbuf[6 + 1];
                                  const char *ep;
                                  sprintf (expbuf, "%+d", exponent);
                                  for (ep = expbuf; (*p = *ep) != '\0'; ep++)
                                    p++;
                                }
#  endif
                          }
                      }
# else
                    abort ();
# endif
                  }

                /* The generated string now extends from tmp to p, with the
                   zero padding insertion point being at pad_ptr.  */
                count = p - tmp;

                if (count < width)
                  {
                    size_t pad = width - count;
                    DCHAR_T *end = p + pad;

                    if (flags & FLAG_LEFT)
                      {
                        /* Pad with spaces on the right.  */
                        for (; pad > 0; pad--)
                          *p++ = ' ';
                      }
                    else if ((flags & FLAG_ZERO) && pad_ptr != NULL)
                      {
                        /* Pad with zeroes.  */
                        DCHAR_T *q = end;

                        while (p > pad_ptr)
                          *--q = *--p;
                        for (; pad > 0; pad--)
                          *p++ = '0';
                      }
                    else
                      {
                        /* Pad with spaces on the left.  */
                        DCHAR_T *q = end;

                        while (p > tmp)
                          *--q = *--p;
                        for (; pad > 0; pad--)
                          *p++ = ' ';
                      }

                    p = end;
                  }

                count = p - tmp;

                if (count >= tmp_length)
                  /* tmp_length was incorrectly calculated - fix the
                     code above!  */
                  abort ();

                /* Make room for the result.  */
                if (count >= allocated - length)
                  {
                    size_t n = xsum (length, count);

                    ENSURE_ALLOCATION (n);
                  }

                /* Append the result.  */
                memcpy (result + length, tmp, count * sizeof (DCHAR_T));
                if (tmp != tmpbuf)
                  free (tmp);
                length += count;
              }
#endif
#if (NEED_PRINTF_INFINITE_DOUBLE || NEED_PRINTF_DOUBLE || NEED_PRINTF_INFINITE_LONG_DOUBLE || NEED_PRINTF_LONG_DOUBLE) && !defined IN_LIBINTL
            else if ((dp->conversion == 'f' || dp->conversion == 'F'
                      || dp->conversion == 'e' || dp->conversion == 'E'
                      || dp->conversion == 'g' || dp->conversion == 'G'
                      || dp->conversion == 'a' || dp->conversion == 'A')
                     && (0
# if NEED_PRINTF_DOUBLE
                         || a.arg[dp->arg_index].type == TYPE_DOUBLE
# elif NEED_PRINTF_INFINITE_DOUBLE
                         || (a.arg[dp->arg_index].type == TYPE_DOUBLE
                             /* The systems (mingw) which produce wrong output
                                for Inf, -Inf, and NaN also do so for -0.0.
                                Therefore we treat this case here as well.  */
                             && is_infinite_or_zero (a.arg[dp->arg_index].a.a_double))
# endif
# if NEED_PRINTF_LONG_DOUBLE
                         || a.arg[dp->arg_index].type == TYPE_LONGDOUBLE
# elif NEED_PRINTF_INFINITE_LONG_DOUBLE
                         || (a.arg[dp->arg_index].type == TYPE_LONGDOUBLE
                             /* Some systems produce wrong output for Inf,
                                -Inf, and NaN.  Some systems in this category
                                (IRIX 5.3) also do so for -0.0.  Therefore we
                                treat this case here as well.  */
                             && is_infinite_or_zerol (a.arg[dp->arg_index].a.a_longdouble))
# endif
                        ))
              {
# if (NEED_PRINTF_DOUBLE || NEED_PRINTF_INFINITE_DOUBLE) && (NEED_PRINTF_LONG_DOUBLE || NEED_PRINTF_INFINITE_LONG_DOUBLE)
                arg_type type = a.arg[dp->arg_index].type;
# endif
                int flags = dp->flags;
                size_t width;
                size_t count;
                int has_precision;
                size_t precision;
                size_t tmp_length;
                DCHAR_T tmpbuf[700];
                DCHAR_T *tmp;
                DCHAR_T *pad_ptr;
                DCHAR_T *p;

                width = 0;
                if (dp->width_start != dp->width_end)
                  {
                    if (dp->width_arg_index != ARG_NONE)
                      {
                        int arg;

                        if (!(a.arg[dp->width_arg_index].type == TYPE_INT))
                          abort ();
                        arg = a.arg[dp->width_arg_index].a.a_int;
                        width = arg;
                        if (arg < 0)
                          {
                            /* "A negative field width is taken as a '-' flag
                                followed by a positive field width."  */
                            flags |= FLAG_LEFT;
                            width = -width;
                          }
                      }
                    else
                      {
                        const FCHAR_T *digitp = dp->width_start;

                        do
                          width = xsum (xtimes (width, 10), *digitp++ - '0');
                        while (digitp != dp->width_end);
                      }
                  }

                has_precision = 0;
                precision = 0;
                if (dp->precision_start != dp->precision_end)
                  {
                    if (dp->precision_arg_index != ARG_NONE)
                      {
                        int arg;

                        if (!(a.arg[dp->precision_arg_index].type == TYPE_INT))
                          abort ();
                        arg = a.arg[dp->precision_arg_index].a.a_int;
                        /* "A negative precision is taken as if the precision
                            were omitted."  */
                        if (arg >= 0)
                          {
                            precision = arg;
                            has_precision = 1;
                          }
                      }
                    else
                      {
                        const FCHAR_T *digitp = dp->precision_start + 1;

                        precision = 0;
                        while (digitp != dp->precision_end)
                          precision = xsum (xtimes (precision, 10), *digitp++ - '0');
                        has_precision = 1;
                      }
                  }

                /* POSIX specifies the default precision to be 6 for %f, %F,
                   %e, %E, but not for %g, %G.  Implementations appear to use
                   the same default precision also for %g, %G.  But for %a, %A,
                   the default precision is 0.  */
                if (!has_precision)
                  if (!(dp->conversion == 'a' || dp->conversion == 'A'))
                    precision = 6;

                /* Allocate a temporary buffer of sufficient size.  */
# if NEED_PRINTF_DOUBLE && NEED_PRINTF_LONG_DOUBLE
                tmp_length = (type == TYPE_LONGDOUBLE ? LDBL_DIG + 1 : DBL_DIG + 1);
# elif NEED_PRINTF_INFINITE_DOUBLE && NEED_PRINTF_LONG_DOUBLE
                tmp_length = (type == TYPE_LONGDOUBLE ? LDBL_DIG + 1 : 0);
# elif NEED_PRINTF_LONG_DOUBLE
                tmp_length = LDBL_DIG + 1;
# elif NEED_PRINTF_DOUBLE
                tmp_length = DBL_DIG + 1;
# else
                tmp_length = 0;
# endif
                if (tmp_length < precision)
                  tmp_length = precision;
# if NEED_PRINTF_LONG_DOUBLE
#  if NEED_PRINTF_DOUBLE || NEED_PRINTF_INFINITE_DOUBLE
                if (type == TYPE_LONGDOUBLE)
#  endif
                  if (dp->conversion == 'f' || dp->conversion == 'F')
                    {
                      long double arg = a.arg[dp->arg_index].a.a_longdouble;
                      if (!(isnanl (arg) || arg + arg == arg))
                        {
                          /* arg is finite and nonzero.  */
                          int exponent = floorlog10l (arg < 0 ? -arg : arg);
                          if (exponent >= 0 && tmp_length < exponent + precision)
                            tmp_length = exponent + precision;
                        }
                    }
# endif
# if NEED_PRINTF_DOUBLE
#  if NEED_PRINTF_LONG_DOUBLE || NEED_PRINTF_INFINITE_LONG_DOUBLE
                if (type == TYPE_DOUBLE)
#  endif
                  if (dp->conversion == 'f' || dp->conversion == 'F')
                    {
                      double arg = a.arg[dp->arg_index].a.a_double;
                      if (!(isnand (arg) || arg + arg == arg))
                        {
                          /* arg is finite and nonzero.  */
                          int exponent = floorlog10 (arg < 0 ? -arg : arg);
                          if (exponent >= 0 && tmp_length < exponent + precision)
                            tmp_length = exponent + precision;
                        }
                    }
# endif
                /* Account for sign, decimal point etc. */
                tmp_length = xsum (tmp_length, 12);

                if (tmp_length < width)
                  tmp_length = width;

                tmp_length = xsum (tmp_length, 1); /* account for trailing NUL */

                if (tmp_length <= sizeof (tmpbuf) / sizeof (DCHAR_T))
                  tmp = tmpbuf;
                else
                  {
                    size_t tmp_memsize = xtimes (tmp_length, sizeof (DCHAR_T));

                    if (size_overflow_p (tmp_memsize))
                      /* Overflow, would lead to out of memory.  */
                      goto out_of_memory;
                    tmp = (DCHAR_T *) malloc (tmp_memsize);
                    if (tmp == NULL)
                      /* Out of memory.  */
                      goto out_of_memory;
                  }

                pad_ptr = NULL;
                p = tmp;

# if NEED_PRINTF_LONG_DOUBLE || NEED_PRINTF_INFINITE_LONG_DOUBLE
#  if NEED_PRINTF_DOUBLE || NEED_PRINTF_INFINITE_DOUBLE
                if (type == TYPE_LONGDOUBLE)
#  endif
                  {
                    long double arg = a.arg[dp->arg_index].a.a_longdouble;

                    if (isnanl (arg))
                      {
                        if (dp->conversion >= 'A' && dp->conversion <= 'Z')
                          {
                            *p++ = 'N'; *p++ = 'A'; *p++ = 'N';
                          }
                        else
                          {
                            *p++ = 'n'; *p++ = 'a'; *p++ = 'n';
                          }
                      }
                    else
                      {
                        int sign = 0;
                        DECL_LONG_DOUBLE_ROUNDING

                        BEGIN_LONG_DOUBLE_ROUNDING ();

                        if (signbit (arg)) /* arg < 0.0L or negative zero */
                          {
                            sign = -1;
                            arg = -arg;
                          }

                        if (sign < 0)
                          *p++ = '-';
                        else if (flags & FLAG_SHOWSIGN)
                          *p++ = '+';
                        else if (flags & FLAG_SPACE)
                          *p++ = ' ';

                        if (arg > 0.0L && arg + arg == arg)
                          {
                            if (dp->conversion >= 'A' && dp->conversion <= 'Z')
                              {
                                *p++ = 'I'; *p++ = 'N'; *p++ = 'F';
                              }
                            else
                              {
                                *p++ = 'i'; *p++ = 'n'; *p++ = 'f';
                              }
                          }
                        else
                          {
#  if NEED_PRINTF_LONG_DOUBLE
                            pad_ptr = p;

                            if (dp->conversion == 'f' || dp->conversion == 'F')
                              {
                                char *digits;
                                size_t ndigits;

                                digits =
                                  scale10_round_decimal_long_double (arg, precision);
                                if (digits == NULL)
                                  {
                                    END_LONG_DOUBLE_ROUNDING ();
                                    goto out_of_memory;
                                  }
                                ndigits = strlen (digits);

                                if (ndigits > precision)
                                  do
                                    {
                                      --ndigits;
                                      *p++ = digits[ndigits];
                                    }
                                  while (ndigits > precision);
                                else
                                  *p++ = '0';
                                /* Here ndigits <= precision.  */
                                if ((flags & FLAG_ALT) || precision > 0)
                                  {
                                    *p++ = decimal_point_char ();
                                    for (; precision > ndigits; precision--)
                                      *p++ = '0';
                                    while (ndigits > 0)
                                      {
                                        --ndigits;
                                        *p++ = digits[ndigits];
                                      }
                                  }

                                free (digits);
                              }
                            else if (dp->conversion == 'e' || dp->conversion == 'E')
                              {
                                int exponent;

                                if (arg == 0.0L)
                                  {
                                    exponent = 0;
                                    *p++ = '0';
                                    if ((flags & FLAG_ALT) || precision > 0)
                                      {
                                        *p++ = decimal_point_char ();
                                        for (; precision > 0; precision--)
                                          *p++ = '0';
                                      }
                                  }
                                else
                                  {
                                    /* arg > 0.0L.  */
                                    int adjusted;
                                    char *digits;
                                    size_t ndigits;

                                    exponent = floorlog10l (arg);
                                    adjusted = 0;
                                    for (;;)
                                      {
                                        digits =
                                          scale10_round_decimal_long_double (arg,
                                                                             (int)precision - exponent);
                                        if (digits == NULL)
                                          {
                                            END_LONG_DOUBLE_ROUNDING ();
                                            goto out_of_memory;
                                          }
                                        ndigits = strlen (digits);

                                        if (ndigits == precision + 1)
                                          break;
                                        if (ndigits < precision
                                            || ndigits > precision + 2)
                                          /* The exponent was not guessed
                                             precisely enough.  */
                                          abort ();
                                        if (adjusted)
                                          /* None of two values of exponent is
                                             the right one.  Prevent an endless
                                             loop.  */
                                          abort ();
                                        free (digits);
                                        if (ndigits == precision)
                                          exponent -= 1;
                                        else
                                          exponent += 1;
                                        adjusted = 1;
                                      }
                                    /* Here ndigits = precision+1.  */
                                    if (is_borderline (digits, precision))
                                      {
                                        /* Maybe the exponent guess was too high
                                           and a smaller exponent can be reached
                                           by turning a 10...0 into 9...9x.  */
                                        char *digits2 =
                                          scale10_round_decimal_long_double (arg,
                                                                             (int)precision - exponent + 1);
                                        if (digits2 == NULL)
                                          {
                                            free (digits);
                                            END_LONG_DOUBLE_ROUNDING ();
                                            goto out_of_memory;
                                          }
                                        if (strlen (digits2) == precision + 1)
                                          {
                                            free (digits);
                                            digits = digits2;
                                            exponent -= 1;
                                          }
                                        else
                                          free (digits2);
                                      }
                                    /* Here ndigits = precision+1.  */

                                    *p++ = digits[--ndigits];
                                    if ((flags & FLAG_ALT) || precision > 0)
                                      {
                                        *p++ = decimal_point_char ();
                                        while (ndigits > 0)
                                          {
                                            --ndigits;
                                            *p++ = digits[ndigits];
                                          }
                                      }

                                    free (digits);
                                  }

                                *p++ = dp->conversion; /* 'e' or 'E' */
#   if WIDE_CHAR_VERSION
                                {
                                  static const wchar_t decimal_format[] =
                                    { '%', '+', '.', '2', 'd', '\0' };
                                  SNPRINTF (p, 6 + 1, decimal_format, exponent);
                                }
                                while (*p != '\0')
                                  p++;
#   else
                                if (sizeof (DCHAR_T) == 1)
                                  {
                                    sprintf ((char *) p, "%+.2d", exponent);
                                    while (*p != '\0')
                                      p++;
                                  }
                                else
                                  {
                                    char expbuf[6 + 1];
                                    const char *ep;
                                    sprintf (expbuf, "%+.2d", exponent);
                                    for (ep = expbuf; (*p = *ep) != '\0'; ep++)
                                      p++;
                                  }
#   endif
                              }
                            else if (dp->conversion == 'g' || dp->conversion == 'G')
                              {
                                if (precision == 0)
                                  precision = 1;
                                /* precision >= 1.  */

                                if (arg == 0.0L)
                                  /* The exponent is 0, >= -4, < precision.
                                     Use fixed-point notation.  */
                                  {
                                    size_t ndigits = precision;
                                    /* Number of trailing zeroes that have to be
                                       dropped.  */
                                    size_t nzeroes =
                                      (flags & FLAG_ALT ? 0 : precision - 1);

                                    --ndigits;
                                    *p++ = '0';
                                    if ((flags & FLAG_ALT) || ndigits > nzeroes)
                                      {
                                        *p++ = decimal_point_char ();
                                        while (ndigits > nzeroes)
                                          {
                                            --ndigits;
                                            *p++ = '0';
                                          }
                                      }
                                  }
                                else
                                  {
                                    /* arg > 0.0L.  */
                                    int exponent;
                                    int adjusted;
                                    char *digits;
                                    size_t ndigits;
                                    size_t nzeroes;

                                    exponent = floorlog10l (arg);
                                    adjusted = 0;
                                    for (;;)
                                      {
                                        digits =
                                          scale10_round_decimal_long_double (arg,
                                                                             (int)(precision - 1) - exponent);
                                        if (digits == NULL)
                                          {
                                            END_LONG_DOUBLE_ROUNDING ();
                                            goto out_of_memory;
                                          }
                                        ndigits = strlen (digits);

                                        if (ndigits == precision)
                                          break;
                                        if (ndigits < precision - 1
                                            || ndigits > precision + 1)
                                          /* The exponent was not guessed
                                             precisely enough.  */
                                          abort ();
                                        if (adjusted)
                                          /* None of two values of exponent is
                                             the right one.  Prevent an endless
                                             loop.  */
                                          abort ();
                                        free (digits);
                                        if (ndigits < precision)
                                          exponent -= 1;
                                        else
                                          exponent += 1;
                                        adjusted = 1;
                                      }
                                    /* Here ndigits = precision.  */
                                    if (is_borderline (digits, precision - 1))
                                      {
                                        /* Maybe the exponent guess was too high
                                           and a smaller exponent can be reached
                                           by turning a 10...0 into 9...9x.  */
                                        char *digits2 =
                                          scale10_round_decimal_long_double (arg,
                                                                             (int)(precision - 1) - exponent + 1);
                                        if (digits2 == NULL)
                                          {
                                            free (digits);
                                            END_LONG_DOUBLE_ROUNDING ();
                                            goto out_of_memory;
                                          }
                                        if (strlen (digits2) == precision)
                                          {
                                            free (digits);
                                            digits = digits2;
                                            exponent -= 1;
                                          }
                                        else
                                          free (digits2);
                                      }
                                    /* Here ndigits = precision.  */

                                    /* Determine the number of trailing zeroes
                                       that have to be dropped.  */
                                    nzeroes = 0;
                                    if ((flags & FLAG_ALT) == 0)
                                      while (nzeroes < ndigits
                                             && digits[nzeroes] == '0')
                                        nzeroes++;

                                    /* The exponent is now determined.  */
                                    if (exponent >= -4
                                        && exponent < (long)precision)
                                      {
                                        /* Fixed-point notation:
                                           max(exponent,0)+1 digits, then the
                                           decimal point, then the remaining
                                           digits without trailing zeroes.  */
                                        if (exponent >= 0)
                                          {
                                            size_t ecount = exponent + 1;
                                            /* Note: count <= precision = ndigits.  */
                                            for (; ecount > 0; ecount--)
                                              *p++ = digits[--ndigits];
                                            if ((flags & FLAG_ALT) || ndigits > nzeroes)
                                              {
                                                *p++ = decimal_point_char ();
                                                while (ndigits > nzeroes)
                                                  {
                                                    --ndigits;
                                                    *p++ = digits[ndigits];
                                                  }
                                              }
                                          }
                                        else
                                          {
                                            size_t ecount = -exponent - 1;
                                            *p++ = '0';
                                            *p++ = decimal_point_char ();
                                            for (; ecount > 0; ecount--)
                                              *p++ = '0';
                                            while (ndigits > nzeroes)
                                              {
                                                --ndigits;
                                                *p++ = digits[ndigits];
                                              }
                                          }
                                      }
                                    else
                                      {
                                        /* Exponential notation.  */
                                        *p++ = digits[--ndigits];
                                        if ((flags & FLAG_ALT) || ndigits > nzeroes)
                                          {
                                            *p++ = decimal_point_char ();
                                            while (ndigits > nzeroes)
                                              {
                                                --ndigits;
                                                *p++ = digits[ndigits];
                                              }
                                          }
                                        *p++ = dp->conversion - 'G' + 'E'; /* 'e' or 'E' */
#   if WIDE_CHAR_VERSION
                                        {
                                          static const wchar_t decimal_format[] =
                                            { '%', '+', '.', '2', 'd', '\0' };
                                          SNPRINTF (p, 6 + 1, decimal_format, exponent);
                                        }
                                        while (*p != '\0')
                                          p++;
#   else
                                        if (sizeof (DCHAR_T) == 1)
                                          {
                                            sprintf ((char *) p, "%+.2d", exponent);
                                            while (*p != '\0')
                                              p++;
                                          }
                                        else
                                          {
                                            char expbuf[6 + 1];
                                            const char *ep;
                                            sprintf (expbuf, "%+.2d", exponent);
                                            for (ep = expbuf; (*p = *ep) != '\0'; ep++)
                                              p++;
                                          }
#   endif
                                      }

                                    free (digits);
                                  }
                              }
                            else
                              abort ();
#  else
                            /* arg is finite.  */
                            if (!(arg == 0.0L))
                              abort ();

                            pad_ptr = p;

                            if (dp->conversion == 'f' || dp->conversion == 'F')
                              {
                                *p++ = '0';
                                if ((flags & FLAG_ALT) || precision > 0)
                                  {
                                    *p++ = decimal_point_char ();
                                    for (; precision > 0; precision--)
                                      *p++ = '0';
                                  }
                              }
                            else if (dp->conversion == 'e' || dp->conversion == 'E')
                              {
                                *p++ = '0';
                                if ((flags & FLAG_ALT) || precision > 0)
                                  {
                                    *p++ = decimal_point_char ();
                                    for (; precision > 0; precision--)
                                      *p++ = '0';
                                  }
                                *p++ = dp->conversion; /* 'e' or 'E' */
                                *p++ = '+';
                                *p++ = '0';
                                *p++ = '0';
                              }
                            else if (dp->conversion == 'g' || dp->conversion == 'G')
                              {
                                *p++ = '0';
                                if (flags & FLAG_ALT)
                                  {
                                    size_t ndigits =
                                      (precision > 0 ? precision - 1 : 0);
                                    *p++ = decimal_point_char ();
                                    for (; ndigits > 0; --ndigits)
                                      *p++ = '0';
                                  }
                              }
                            else if (dp->conversion == 'a' || dp->conversion == 'A')
                              {
                                *p++ = '0';
                                *p++ = dp->conversion - 'A' + 'X';
                                pad_ptr = p;
                                *p++ = '0';
                                if ((flags & FLAG_ALT) || precision > 0)
                                  {
                                    *p++ = decimal_point_char ();
                                    for (; precision > 0; precision--)
                                      *p++ = '0';
                                  }
                                *p++ = dp->conversion - 'A' + 'P';
                                *p++ = '+';
                                *p++ = '0';
                              }
                            else
                              abort ();
#  endif
                          }

                        END_LONG_DOUBLE_ROUNDING ();
                      }
                  }
#  if NEED_PRINTF_DOUBLE || NEED_PRINTF_INFINITE_DOUBLE
                else
#  endif
# endif
# if NEED_PRINTF_DOUBLE || NEED_PRINTF_INFINITE_DOUBLE
                  {
                    double arg = a.arg[dp->arg_index].a.a_double;

                    if (isnand (arg))
                      {
                        if (dp->conversion >= 'A' && dp->conversion <= 'Z')
                          {
                            *p++ = 'N'; *p++ = 'A'; *p++ = 'N';
                          }
                        else
                          {
                            *p++ = 'n'; *p++ = 'a'; *p++ = 'n';
                          }
                      }
                    else
                      {
                        int sign = 0;

                        if (signbit (arg)) /* arg < 0.0 or negative zero */
                          {
                            sign = -1;
                            arg = -arg;
                          }

                        if (sign < 0)
                          *p++ = '-';
                        else if (flags & FLAG_SHOWSIGN)
                          *p++ = '+';
                        else if (flags & FLAG_SPACE)
                          *p++ = ' ';

                        if (arg > 0.0 && arg + arg == arg)
                          {
                            if (dp->conversion >= 'A' && dp->conversion <= 'Z')
                              {
                                *p++ = 'I'; *p++ = 'N'; *p++ = 'F';
                              }
                            else
                              {
                                *p++ = 'i'; *p++ = 'n'; *p++ = 'f';
                              }
                          }
                        else
                          {
#  if NEED_PRINTF_DOUBLE
                            pad_ptr = p;

                            if (dp->conversion == 'f' || dp->conversion == 'F')
                              {
                                char *digits;
                                size_t ndigits;

                                digits =
                                  scale10_round_decimal_double (arg, precision);
                                if (digits == NULL)
                                  goto out_of_memory;
                                ndigits = strlen (digits);

                                if (ndigits > precision)
                                  do
                                    {
                                      --ndigits;
                                      *p++ = digits[ndigits];
                                    }
                                  while (ndigits > precision);
                                else
                                  *p++ = '0';
                                /* Here ndigits <= precision.  */
                                if ((flags & FLAG_ALT) || precision > 0)
                                  {
                                    *p++ = decimal_point_char ();
                                    for (; precision > ndigits; precision--)
                                      *p++ = '0';
                                    while (ndigits > 0)
                                      {
                                        --ndigits;
                                        *p++ = digits[ndigits];
                                      }
                                  }

                                free (digits);
                              }
                            else if (dp->conversion == 'e' || dp->conversion == 'E')
                              {
                                int exponent;

                                if (arg == 0.0)
                                  {
                                    exponent = 0;
                                    *p++ = '0';
                                    if ((flags & FLAG_ALT) || precision > 0)
                                      {
                                        *p++ = decimal_point_char ();
                                        for (; precision > 0; precision--)
                                          *p++ = '0';
                                      }
                                  }
                                else
                                  {
                                    /* arg > 0.0.  */
                                    int adjusted;
                                    char *digits;
                                    size_t ndigits;

                                    exponent = floorlog10 (arg);
                                    adjusted = 0;
                                    for (;;)
                                      {
                                        digits =
                                          scale10_round_decimal_double (arg,
                                                                        (int)precision - exponent);
                                        if (digits == NULL)
                                          goto out_of_memory;
                                        ndigits = strlen (digits);

                                        if (ndigits == precision + 1)
                                          break;
                                        if (ndigits < precision
                                            || ndigits > precision + 2)
                                          /* The exponent was not guessed
                                             precisely enough.  */
                                          abort ();
                                        if (adjusted)
                                          /* None of two values of exponent is
                                             the right one.  Prevent an endless
                                             loop.  */
                                          abort ();
                                        free (digits);
                                        if (ndigits == precision)
                                          exponent -= 1;
                                        else
                                          exponent += 1;
                                        adjusted = 1;
                                      }
                                    /* Here ndigits = precision+1.  */
                                    if (is_borderline (digits, precision))
                                      {
                                        /* Maybe the exponent guess was too high
                                           and a smaller exponent can be reached
                                           by turning a 10...0 into 9...9x.  */
                                        char *digits2 =
                                          scale10_round_decimal_double (arg,
                                                                        (int)precision - exponent + 1);
                                        if (digits2 == NULL)
                                          {
                                            free (digits);
                                            goto out_of_memory;
                                          }
                                        if (strlen (digits2) == precision + 1)
                                          {
                                            free (digits);
                                            digits = digits2;
                                            exponent -= 1;
                                          }
                                        else
                                          free (digits2);
                                      }
                                    /* Here ndigits = precision+1.  */

                                    *p++ = digits[--ndigits];
                                    if ((flags & FLAG_ALT) || precision > 0)
                                      {
                                        *p++ = decimal_point_char ();
                                        while (ndigits > 0)
                                          {
                                            --ndigits;
                                            *p++ = digits[ndigits];
                                          }
                                      }

                                    free (digits);
                                  }

                                *p++ = dp->conversion; /* 'e' or 'E' */
#   if WIDE_CHAR_VERSION
                                {
                                  static const wchar_t decimal_format[] =
                                    /* Produce the same number of exponent digits
                                       as the native printf implementation.  */
#    if defined _WIN32 && ! defined __CYGWIN__
                                    { '%', '+', '.', '3', 'd', '\0' };
#    else
                                    { '%', '+', '.', '2', 'd', '\0' };
#    endif
                                  SNPRINTF (p, 6 + 1, decimal_format, exponent);
                                }
                                while (*p != '\0')
                                  p++;
#   else
                                {
                                  static const char decimal_format[] =
                                    /* Produce the same number of exponent digits
                                       as the native printf implementation.  */
#    if defined _WIN32 && ! defined __CYGWIN__
                                    "%+.3d";
#    else
                                    "%+.2d";
#    endif
                                  if (sizeof (DCHAR_T) == 1)
                                    {
                                      sprintf ((char *) p, decimal_format, exponent);
                                      while (*p != '\0')
                                        p++;
                                    }
                                  else
                                    {
                                      char expbuf[6 + 1];
                                      const char *ep;
                                      sprintf (expbuf, decimal_format, exponent);
                                      for (ep = expbuf; (*p = *ep) != '\0'; ep++)
                                        p++;
                                    }
                                }
#   endif
                              }
                            else if (dp->conversion == 'g' || dp->conversion == 'G')
                              {
                                if (precision == 0)
                                  precision = 1;
                                /* precision >= 1.  */

                                if (arg == 0.0)
                                  /* The exponent is 0, >= -4, < precision.
                                     Use fixed-point notation.  */
                                  {
                                    size_t ndigits = precision;
                                    /* Number of trailing zeroes that have to be
                                       dropped.  */
                                    size_t nzeroes =
                                      (flags & FLAG_ALT ? 0 : precision - 1);

                                    --ndigits;
                                    *p++ = '0';
                                    if ((flags & FLAG_ALT) || ndigits > nzeroes)
                                      {
                                        *p++ = decimal_point_char ();
                                        while (ndigits > nzeroes)
                                          {
                                            --ndigits;
                                            *p++ = '0';
                                          }
                                      }
                                  }
                                else
                                  {
                                    /* arg > 0.0.  */
                                    int exponent;
                                    int adjusted;
                                    char *digits;
                                    size_t ndigits;
                                    size_t nzeroes;

                                    exponent = floorlog10 (arg);
                                    adjusted = 0;
                                    for (;;)
                                      {
                                        digits =
                                          scale10_round_decimal_double (arg,
                                                                        (int)(precision - 1) - exponent);
                                        if (digits == NULL)
                                          goto out_of_memory;
                                        ndigits = strlen (digits);

                                        if (ndigits == precision)
                                          break;
                                        if (ndigits < precision - 1
                                            || ndigits > precision + 1)
                                          /* The exponent was not guessed
                                             precisely enough.  */
                                          abort ();
                                        if (adjusted)
                                          /* None of two values of exponent is
                                             the right one.  Prevent an endless
                                             loop.  */
                                          abort ();
                                        free (digits);
                                        if (ndigits < precision)
                                          exponent -= 1;
                                        else
                                          exponent += 1;
                                        adjusted = 1;
                                      }
                                    /* Here ndigits = precision.  */
                                    if (is_borderline (digits, precision - 1))
                                      {
                                        /* Maybe the exponent guess was too high
                                           and a smaller exponent can be reached
                                           by turning a 10...0 into 9...9x.  */
                                        char *digits2 =
                                          scale10_round_decimal_double (arg,
                                                                        (int)(precision - 1) - exponent + 1);
                                        if (digits2 == NULL)
                                          {
                                            free (digits);
                                            goto out_of_memory;
                                          }
                                        if (strlen (digits2) == precision)
                                          {
                                            free (digits);
                                            digits = digits2;
                                            exponent -= 1;
                                          }
                                        else
                                          free (digits2);
                                      }
                                    /* Here ndigits = precision.  */

                                    /* Determine the number of trailing zeroes
                                       that have to be dropped.  */
                                    nzeroes = 0;
                                    if ((flags & FLAG_ALT) == 0)
                                      while (nzeroes < ndigits
                                             && digits[nzeroes] == '0')
                                        nzeroes++;

                                    /* The exponent is now determined.  */
                                    if (exponent >= -4
                                        && exponent < (long)precision)
                                      {
                                        /* Fixed-point notation:
                                           max(exponent,0)+1 digits, then the
                                           decimal point, then the remaining
                                           digits without trailing zeroes.  */
                                        if (exponent >= 0)
                                          {
                                            size_t ecount = exponent + 1;
                                            /* Note: ecount <= precision = ndigits.  */
                                            for (; ecount > 0; ecount--)
                                              *p++ = digits[--ndigits];
                                            if ((flags & FLAG_ALT) || ndigits > nzeroes)
                                              {
                                                *p++ = decimal_point_char ();
                                                while (ndigits > nzeroes)
                                                  {
                                                    --ndigits;
                                                    *p++ = digits[ndigits];
                                                  }
                                              }
                                          }
                                        else
                                          {
                                            size_t ecount = -exponent - 1;
                                            *p++ = '0';
                                            *p++ = decimal_point_char ();
                                            for (; ecount > 0; ecount--)
                                              *p++ = '0';
                                            while (ndigits > nzeroes)
                                              {
                                                --ndigits;
                                                *p++ = digits[ndigits];
                                              }
                                          }
                                      }
                                    else
                                      {
                                        /* Exponential notation.  */
                                        *p++ = digits[--ndigits];
                                        if ((flags & FLAG_ALT) || ndigits > nzeroes)
                                          {
                                            *p++ = decimal_point_char ();
                                            while (ndigits > nzeroes)
                                              {
                                                --ndigits;
                                                *p++ = digits[ndigits];
                                              }
                                          }
                                        *p++ = dp->conversion - 'G' + 'E'; /* 'e' or 'E' */
#   if WIDE_CHAR_VERSION
                                        {
                                          static const wchar_t decimal_format[] =
                                            /* Produce the same number of exponent digits
                                               as the native printf implementation.  */
#    if defined _WIN32 && ! defined __CYGWIN__
                                            { '%', '+', '.', '3', 'd', '\0' };
#    else
                                            { '%', '+', '.', '2', 'd', '\0' };
#    endif
                                          SNPRINTF (p, 6 + 1, decimal_format, exponent);
                                        }
                                        while (*p != '\0')
                                          p++;
#   else
                                        {
                                          static const char decimal_format[] =
                                            /* Produce the same number of exponent digits
                                               as the native printf implementation.  */
#    if defined _WIN32 && ! defined __CYGWIN__
                                            "%+.3d";
#    else
                                            "%+.2d";
#    endif
                                          if (sizeof (DCHAR_T) == 1)
                                            {
                                              sprintf ((char *) p, decimal_format, exponent);
                                              while (*p != '\0')
                                                p++;
                                            }
                                          else
                                            {
                                              char expbuf[6 + 1];
                                              const char *ep;
                                              sprintf (expbuf, decimal_format, exponent);
                                              for (ep = expbuf; (*p = *ep) != '\0'; ep++)
                                                p++;
                                            }
                                        }
#   endif
                                      }

                                    free (digits);
                                  }
                              }
                            else
                              abort ();
#  else
                            /* arg is finite.  */
                            if (!(arg == 0.0))
                              abort ();

                            pad_ptr = p;

                            if (dp->conversion == 'f' || dp->conversion == 'F')
                              {
                                *p++ = '0';
                                if ((flags & FLAG_ALT) || precision > 0)
                                  {
                                    *p++ = decimal_point_char ();
                                    for (; precision > 0; precision--)
                                      *p++ = '0';
                                  }
                              }
                            else if (dp->conversion == 'e' || dp->conversion == 'E')
                              {
                                *p++ = '0';
                                if ((flags & FLAG_ALT) || precision > 0)
                                  {
                                    *p++ = decimal_point_char ();
                                    for (; precision > 0; precision--)
                                      *p++ = '0';
                                  }
                                *p++ = dp->conversion; /* 'e' or 'E' */
                                *p++ = '+';
                                /* Produce the same number of exponent digits as
                                   the native printf implementation.  */
#   if defined _WIN32 && ! defined __CYGWIN__
                                *p++ = '0';
#   endif
                                *p++ = '0';
                                *p++ = '0';
                              }
                            else if (dp->conversion == 'g' || dp->conversion == 'G')
                              {
                                *p++ = '0';
                                if (flags & FLAG_ALT)
                                  {
                                    size_t ndigits =
                                      (precision > 0 ? precision - 1 : 0);
                                    *p++ = decimal_point_char ();
                                    for (; ndigits > 0; --ndigits)
                                      *p++ = '0';
                                  }
                              }
                            else
                              abort ();
#  endif
                          }
                      }
                  }
# endif

                /* The generated string now extends from tmp to p, with the
                   zero padding insertion point being at pad_ptr.  */
                count = p - tmp;

                if (count < width)
                  {
                    size_t pad = width - count;
                    DCHAR_T *end = p + pad;

                    if (flags & FLAG_LEFT)
                      {
                        /* Pad with spaces on the right.  */
                        for (; pad > 0; pad--)
                          *p++ = ' ';
                      }
                    else if ((flags & FLAG_ZERO) && pad_ptr != NULL)
                      {
                        /* Pad with zeroes.  */
                        DCHAR_T *q = end;

                        while (p > pad_ptr)
                          *--q = *--p;
                        for (; pad > 0; pad--)
                          *p++ = '0';
                      }
                    else
                      {
                        /* Pad with spaces on the left.  */
                        DCHAR_T *q = end;

                        while (p > tmp)
                          *--q = *--p;
                        for (; pad > 0; pad--)
                          *p++ = ' ';
                      }

                    p = end;
                  }

                count = p - tmp;

                if (count >= tmp_length)
                  /* tmp_length was incorrectly calculated - fix the
                     code above!  */
                  abort ();

                /* Make room for the result.  */
                if (count >= allocated - length)
                  {
                    size_t n = xsum (length, count);

                    ENSURE_ALLOCATION (n);
                  }

                /* Append the result.  */
                memcpy (result + length, tmp, count * sizeof (DCHAR_T));
                if (tmp != tmpbuf)
                  free (tmp);
                length += count;
              }
#endif
            else
              {
                arg_type type = a.arg[dp->arg_index].type;
                int flags = dp->flags;
#if !DCHAR_IS_TCHAR || ENABLE_UNISTDIO || NEED_PRINTF_FLAG_LEFTADJUST || NEED_PRINTF_FLAG_ZERO || NEED_PRINTF_UNBOUNDED_PRECISION
                int has_width;
#endif
#if !USE_SNPRINTF || !HAVE_SNPRINTF_RETVAL_C99 || USE_MSVC__SNPRINTF || !DCHAR_IS_TCHAR || ENABLE_UNISTDIO || NEED_PRINTF_FLAG_LEFTADJUST || NEED_PRINTF_FLAG_ZERO || NEED_PRINTF_UNBOUNDED_PRECISION
                size_t width;
#endif
#if !USE_SNPRINTF || !HAVE_SNPRINTF_RETVAL_C99 || USE_MSVC__SNPRINTF || NEED_PRINTF_UNBOUNDED_PRECISION
                int has_precision;
                size_t precision;
#endif
#if NEED_PRINTF_UNBOUNDED_PRECISION
                int prec_ourselves;
#else
#               define prec_ourselves 0
#endif
#if NEED_PRINTF_FLAG_LEFTADJUST
#               define pad_ourselves 1
#elif !DCHAR_IS_TCHAR || ENABLE_UNISTDIO || NEED_PRINTF_FLAG_ZERO || NEED_PRINTF_UNBOUNDED_PRECISION
                int pad_ourselves;
#else
#               define pad_ourselves 0
#endif
                TCHAR_T *fbp;
                unsigned int prefix_count;
                int prefixes[2] IF_LINT (= { 0 });
                int orig_errno;
#if !USE_SNPRINTF
                size_t tmp_length;
                TCHAR_T tmpbuf[700];
                TCHAR_T *tmp;
#endif

#if !DCHAR_IS_TCHAR || ENABLE_UNISTDIO || NEED_PRINTF_FLAG_LEFTADJUST || NEED_PRINTF_FLAG_ZERO || NEED_PRINTF_UNBOUNDED_PRECISION
                has_width = 0;
#endif
#if !USE_SNPRINTF || !HAVE_SNPRINTF_RETVAL_C99 || USE_MSVC__SNPRINTF || !DCHAR_IS_TCHAR || ENABLE_UNISTDIO || NEED_PRINTF_FLAG_LEFTADJUST || NEED_PRINTF_FLAG_ZERO || NEED_PRINTF_UNBOUNDED_PRECISION
                width = 0;
                if (dp->width_start != dp->width_end)
                  {
                    if (dp->width_arg_index != ARG_NONE)
                      {
                        int arg;

                        if (!(a.arg[dp->width_arg_index].type == TYPE_INT))
                          abort ();
                        arg = a.arg[dp->width_arg_index].a.a_int;
                        width = arg;
                        if (arg < 0)
                          {
                            /* "A negative field width is taken as a '-' flag
                                followed by a positive field width."  */
                            flags |= FLAG_LEFT;
                            width = -width;
                          }
                      }
                    else
                      {
                        const FCHAR_T *digitp = dp->width_start;

                        do
                          width = xsum (xtimes (width, 10), *digitp++ - '0');
                        while (digitp != dp->width_end);
                      }
#if !DCHAR_IS_TCHAR || ENABLE_UNISTDIO || NEED_PRINTF_FLAG_LEFTADJUST || NEED_PRINTF_FLAG_ZERO || NEED_PRINTF_UNBOUNDED_PRECISION
                    has_width = 1;
#endif
                  }
#endif

#if !USE_SNPRINTF || !HAVE_SNPRINTF_RETVAL_C99 || USE_MSVC__SNPRINTF || NEED_PRINTF_UNBOUNDED_PRECISION
                has_precision = 0;
                precision = 6;
                if (dp->precision_start != dp->precision_end)
                  {
                    if (dp->precision_arg_index != ARG_NONE)
                      {
                        int arg;

                        if (!(a.arg[dp->precision_arg_index].type == TYPE_INT))
                          abort ();
                        arg = a.arg[dp->precision_arg_index].a.a_int;
                        /* "A negative precision is taken as if the precision
                            were omitted."  */
                        if (arg >= 0)
                          {
                            precision = arg;
                            has_precision = 1;
                          }
                      }
                    else
                      {
                        const FCHAR_T *digitp = dp->precision_start + 1;

                        precision = 0;
                        while (digitp != dp->precision_end)
                          precision = xsum (xtimes (precision, 10), *digitp++ - '0');
                        has_precision = 1;
                      }
                  }
#endif

                /* Decide whether to handle the precision ourselves.  */
#if NEED_PRINTF_UNBOUNDED_PRECISION
                switch (dp->conversion)
                  {
                  case 'd': case 'i': case 'u':
                  case 'o':
                  case 'x': case 'X': case 'p':
                    prec_ourselves = has_precision && (precision > 0);
                    break;
                  default:
                    prec_ourselves = 0;
                    break;
                  }
#endif

                /* Decide whether to perform the padding ourselves.  */
#if !NEED_PRINTF_FLAG_LEFTADJUST && (!DCHAR_IS_TCHAR || ENABLE_UNISTDIO || NEED_PRINTF_FLAG_ZERO || NEED_PRINTF_UNBOUNDED_PRECISION)
                switch (dp->conversion)
                  {
# if !DCHAR_IS_TCHAR || ENABLE_UNISTDIO
                  /* If we need conversion from TCHAR_T[] to DCHAR_T[], we need
                     to perform the padding after this conversion.  Functions
                     with unistdio extensions perform the padding based on
                     character count rather than element count.  */
                  case 'c': case 's':
# endif
# if NEED_PRINTF_FLAG_ZERO
                  case 'f': case 'F': case 'e': case 'E': case 'g': case 'G':
                  case 'a': case 'A':
# endif
                    pad_ourselves = 1;
                    break;
                  default:
                    pad_ourselves = prec_ourselves;
                    break;
                  }
#endif

#if !USE_SNPRINTF
                /* Allocate a temporary buffer of sufficient size for calling
                   sprintf.  */
                tmp_length =
                  MAX_ROOM_NEEDED (&a, dp->arg_index, dp->conversion, type,
                                   flags, width, has_precision, precision,
                                   pad_ourselves);

                if (tmp_length <= sizeof (tmpbuf) / sizeof (TCHAR_T))
                  tmp = tmpbuf;
                else
                  {
                    size_t tmp_memsize = xtimes (tmp_length, sizeof (TCHAR_T));

                    if (size_overflow_p (tmp_memsize))
                      /* Overflow, would lead to out of memory.  */
                      goto out_of_memory;
                    tmp = (TCHAR_T *) malloc (tmp_memsize);
                    if (tmp == NULL)
                      /* Out of memory.  */
                      goto out_of_memory;
                  }
#endif

                /* Construct the format string for calling snprintf or
                   sprintf.  */
                fbp = buf;
                *fbp++ = '%';
#if NEED_PRINTF_FLAG_GROUPING
                /* The underlying implementation doesn't support the ' flag.
                   Produce no grouping characters in this case; this is
                   acceptable because the grouping is locale dependent.  */
#else
                if (flags & FLAG_GROUP)
                  *fbp++ = '\'';
#endif
                if (flags & FLAG_LEFT)
                  *fbp++ = '-';
                if (flags & FLAG_SHOWSIGN)
                  *fbp++ = '+';
                if (flags & FLAG_SPACE)
                  *fbp++ = ' ';
                if (flags & FLAG_ALT)
                  *fbp++ = '#';
#if __GLIBC__ >= 2 && !defined __UCLIBC__
                if (flags & FLAG_LOCALIZED)
                  *fbp++ = 'I';
#endif
                if (!pad_ourselves)
                  {
                    if (flags & FLAG_ZERO)
                      *fbp++ = '0';
                    if (dp->width_start != dp->width_end)
                      {
                        size_t n = dp->width_end - dp->width_start;
                        /* The width specification is known to consist only
                           of standard ASCII characters.  */
                        if (sizeof (FCHAR_T) == sizeof (TCHAR_T))
                          {
                            memcpy (fbp, dp->width_start, n * sizeof (TCHAR_T));
                            fbp += n;
                          }
                        else
                          {
                            const FCHAR_T *mp = dp->width_start;
                            do
                              *fbp++ = *mp++;
                            while (--n > 0);
                          }
                      }
                  }
                if (!prec_ourselves)
                  {
                    if (dp->precision_start != dp->precision_end)
                      {
                        size_t n = dp->precision_end - dp->precision_start;
                        /* The precision specification is known to consist only
                           of standard ASCII characters.  */
                        if (sizeof (FCHAR_T) == sizeof (TCHAR_T))
                          {
                            memcpy (fbp, dp->precision_start, n * sizeof (TCHAR_T));
                            fbp += n;
                          }
                        else
                          {
                            const FCHAR_T *mp = dp->precision_start;
                            do
                              *fbp++ = *mp++;
                            while (--n > 0);
                          }
                      }
                  }

                switch (type)
                  {
#if HAVE_LONG_LONG_INT
                  case TYPE_LONGLONGINT:
                  case TYPE_ULONGLONGINT:
# if defined _WIN32 && ! defined __CYGWIN__
                    *fbp++ = 'I';
                    *fbp++ = '6';
                    *fbp++ = '4';
                    break;
# else
                    *fbp++ = 'l';
# endif
#endif
                    FALLTHROUGH;
                  case TYPE_LONGINT:
                  case TYPE_ULONGINT:
#if HAVE_WINT_T
                  case TYPE_WIDE_CHAR:
#endif
#if HAVE_WCHAR_T
                  case TYPE_WIDE_STRING:
#endif
                    *fbp++ = 'l';
                    break;
                  case TYPE_LONGDOUBLE:
                    *fbp++ = 'L';
                    break;
                  default:
                    break;
                  }
#if NEED_PRINTF_DIRECTIVE_F
                if (dp->conversion == 'F')
                  *fbp = 'f';
                else
#endif
                  *fbp = dp->conversion;
#if USE_SNPRINTF
# if ! (((__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3))        \
         && !defined __UCLIBC__)                                            \
        || (defined __APPLE__ && defined __MACH__)                          \
        || (defined _WIN32 && ! defined __CYGWIN__))
                fbp[1] = '%';
                fbp[2] = 'n';
                fbp[3] = '\0';
# else
                /* On glibc2 systems from glibc >= 2.3 - probably also older
                   ones - we know that snprintf's return value conforms to
                   ISO C 99: the tests gl_SNPRINTF_RETVAL_C99 and
                   gl_SNPRINTF_TRUNCATION_C99 pass.
                   Therefore we can avoid using %n in this situation.
                   On glibc2 systems from 2004-10-18 or newer, the use of %n
                   in format strings in writable memory may crash the program
                   (if compiled with _FORTIFY_SOURCE=2), so we should avoid it
                   in this situation.  */
                /* On Mac OS X 10.3 or newer, we know that snprintf's return
                   value conforms to ISO C 99: the tests gl_SNPRINTF_RETVAL_C99
                   and gl_SNPRINTF_TRUNCATION_C99 pass.
                   Therefore we can avoid using %n in this situation.
                   On Mac OS X 10.13 or newer, the use of %n in format strings
                   in writable memory by default crashes the program, so we
                   should avoid it in this situation.  */
                /* On native Windows systems (such as mingw), we can avoid using
                   %n because:
                     - Although the gl_SNPRINTF_TRUNCATION_C99 test fails,
                       snprintf does not write more than the specified number
                       of bytes. (snprintf (buf, 3, "%d %d", 4567, 89) writes
                       '4', '5', '6' into buf, not '4', '5', '\0'.)
                     - Although the gl_SNPRINTF_RETVAL_C99 test fails, snprintf
                       allows us to recognize the case of an insufficient
                       buffer size: it returns -1 in this case.
                   On native Windows systems (such as mingw) where the OS is
                   Windows Vista, the use of %n in format strings by default
                   crashes the program. See
                     <https://gcc.gnu.org/ml/gcc/2007-06/msg00122.html> and
                     <https://msdn.microsoft.com/en-us/library/ms175782.aspx>
                   So we should avoid %n in this situation.  */
                fbp[1] = '\0';
# endif
#else
                fbp[1] = '\0';
#endif

                /* Construct the arguments for calling snprintf or sprintf.  */
                prefix_count = 0;
                if (!pad_ourselves && dp->width_arg_index != ARG_NONE)
                  {
                    if (!(a.arg[dp->width_arg_index].type == TYPE_INT))
                      abort ();
                    prefixes[prefix_count++] = a.arg[dp->width_arg_index].a.a_int;
                  }
                if (!prec_ourselves && dp->precision_arg_index != ARG_NONE)
                  {
                    if (!(a.arg[dp->precision_arg_index].type == TYPE_INT))
                      abort ();
                    prefixes[prefix_count++] = a.arg[dp->precision_arg_index].a.a_int;
                  }

#if USE_SNPRINTF
                /* The SNPRINTF result is appended after result[0..length].
                   The latter is an array of DCHAR_T; SNPRINTF appends an
                   array of TCHAR_T to it.  This is possible because
                   sizeof (TCHAR_T) divides sizeof (DCHAR_T) and
                   alignof (TCHAR_T) <= alignof (DCHAR_T).  */
# define TCHARS_PER_DCHAR (sizeof (DCHAR_T) / sizeof (TCHAR_T))
                /* Ensure that maxlen below will be >= 2.  Needed on BeOS,
                   where an snprintf() with maxlen==1 acts like sprintf().  */
                ENSURE_ALLOCATION (xsum (length,
                                         (2 + TCHARS_PER_DCHAR - 1)
                                         / TCHARS_PER_DCHAR));
                /* Prepare checking whether snprintf returns the count
                   via %n.  */
                *(TCHAR_T *) (result + length) = '\0';
#endif

                orig_errno = errno;

                for (;;)
                  {
                    int count = -1;

#if USE_SNPRINTF
                    int retcount = 0;
                    size_t maxlen = allocated - length;
                    /* SNPRINTF can fail if its second argument is
                       > INT_MAX.  */
                    if (maxlen > INT_MAX / TCHARS_PER_DCHAR)
                      maxlen = INT_MAX / TCHARS_PER_DCHAR;
                    maxlen = maxlen * TCHARS_PER_DCHAR;
# define SNPRINTF_BUF(arg) \
                    switch (prefix_count)                                   \
                      {                                                     \
                      case 0:                                               \
                        retcount = SNPRINTF ((TCHAR_T *) (result + length), \
                                             maxlen, buf,                   \
                                             arg, &count);                  \
                        break;                                              \
                      case 1:                                               \
                        retcount = SNPRINTF ((TCHAR_T *) (result + length), \
                                             maxlen, buf,                   \
                                             prefixes[0], arg, &count);     \
                        break;                                              \
                      case 2:                                               \
                        retcount = SNPRINTF ((TCHAR_T *) (result + length), \
                                             maxlen, buf,                   \
                                             prefixes[0], prefixes[1], arg, \
                                             &count);                       \
                        break;                                              \
                      default:                                              \
                        abort ();                                           \
                      }
#else
# define SNPRINTF_BUF(arg) \
                    switch (prefix_count)                                   \
                      {                                                     \
                      case 0:                                               \
                        count = sprintf (tmp, buf, arg);                    \
                        break;                                              \
                      case 1:                                               \
                        count = sprintf (tmp, buf, prefixes[0], arg);       \
                        break;                                              \
                      case 2:                                               \
                        count = sprintf (tmp, buf, prefixes[0], prefixes[1],\
                                         arg);                              \
                        break;                                              \
                      default:                                              \
                        abort ();                                           \
                      }
#endif

                    errno = 0;
                    switch (type)
                      {
                      case TYPE_SCHAR:
                        {
                          int arg = a.arg[dp->arg_index].a.a_schar;
                          SNPRINTF_BUF (arg);
                        }
                        break;
                      case TYPE_UCHAR:
                        {
                          unsigned int arg = a.arg[dp->arg_index].a.a_uchar;
                          SNPRINTF_BUF (arg);
                        }
                        break;
                      case TYPE_SHORT:
                        {
                          int arg = a.arg[dp->arg_index].a.a_short;
                          SNPRINTF_BUF (arg);
                        }
                        break;
                      case TYPE_USHORT:
                        {
                          unsigned int arg = a.arg[dp->arg_index].a.a_ushort;
                          SNPRINTF_BUF (arg);
                        }
                        break;
                      case TYPE_INT:
                        {
                          int arg = a.arg[dp->arg_index].a.a_int;
                          SNPRINTF_BUF (arg);
                        }
                        break;
                      case TYPE_UINT:
                        {
                          unsigned int arg = a.arg[dp->arg_index].a.a_uint;
                          SNPRINTF_BUF (arg);
                        }
                        break;
                      case TYPE_LONGINT:
                        {
                          long int arg = a.arg[dp->arg_index].a.a_longint;
                          SNPRINTF_BUF (arg);
                        }
                        break;
                      case TYPE_ULONGINT:
                        {
                          unsigned long int arg = a.arg[dp->arg_index].a.a_ulongint;
                          SNPRINTF_BUF (arg);
                        }
                        break;
#if HAVE_LONG_LONG_INT
                      case TYPE_LONGLONGINT:
                        {
                          long long int arg = a.arg[dp->arg_index].a.a_longlongint;
                          SNPRINTF_BUF (arg);
                        }
                        break;
                      case TYPE_ULONGLONGINT:
                        {
                          unsigned long long int arg = a.arg[dp->arg_index].a.a_ulonglongint;
                          SNPRINTF_BUF (arg);
                        }
                        break;
#endif
                      case TYPE_DOUBLE:
                        {
                          double arg = a.arg[dp->arg_index].a.a_double;
                          SNPRINTF_BUF (arg);
                        }
                        break;
                      case TYPE_LONGDOUBLE:
                        {
                          long double arg = a.arg[dp->arg_index].a.a_longdouble;
                          SNPRINTF_BUF (arg);
                        }
                        break;
                      case TYPE_CHAR:
                        {
                          int arg = a.arg[dp->arg_index].a.a_char;
                          SNPRINTF_BUF (arg);
                        }
                        break;
#if HAVE_WINT_T
                      case TYPE_WIDE_CHAR:
                        {
                          wint_t arg = a.arg[dp->arg_index].a.a_wide_char;
                          SNPRINTF_BUF (arg);
                        }
                        break;
#endif
                      case TYPE_STRING:
                        {
                          const char *arg = a.arg[dp->arg_index].a.a_string;
                          SNPRINTF_BUF (arg);
                        }
                        break;
#if HAVE_WCHAR_T
                      case TYPE_WIDE_STRING:
                        {
                          const wchar_t *arg = a.arg[dp->arg_index].a.a_wide_string;
                          SNPRINTF_BUF (arg);
                        }
                        break;
#endif
                      case TYPE_POINTER:
                        {
                          void *arg = a.arg[dp->arg_index].a.a_pointer;
                          SNPRINTF_BUF (arg);
                        }
                        break;
                      default:
                        abort ();
                      }

#if USE_SNPRINTF
                    /* Portability: Not all implementations of snprintf()
                       are ISO C 99 compliant.  Determine the number of
                       bytes that snprintf() has produced or would have
                       produced.  */
                    if (count >= 0)
                      {
                        /* Verify that snprintf() has NUL-terminated its
                           result.  */
                        if (count < maxlen
                            && ((TCHAR_T *) (result + length)) [count] != '\0')
                          abort ();
                        /* Portability hack.  */
                        if (retcount > count)
                          count = retcount;
                      }
                    else
                      {
                        /* snprintf() doesn't understand the '%n'
                           directive.  */
                        if (fbp[1] != '\0')
                          {
                            /* Don't use the '%n' directive; instead, look
                               at the snprintf() return value.  */
                            fbp[1] = '\0';
                            continue;
                          }
                        else
                          {
                            /* Look at the snprintf() return value.  */
                            if (retcount < 0)
                              {
# if !HAVE_SNPRINTF_RETVAL_C99 || USE_MSVC__SNPRINTF
                                /* HP-UX 10.20 snprintf() is doubly deficient:
                                   It doesn't understand the '%n' directive,
                                   *and* it returns -1 (rather than the length
                                   that would have been required) when the
                                   buffer is too small.
                                   But a failure at this point can also come
                                   from other reasons than a too small buffer,
                                   such as an invalid wide string argument to
                                   the %ls directive, or possibly an invalid
                                   floating-point argument.  */
                                size_t tmp_length =
                                  MAX_ROOM_NEEDED (&a, dp->arg_index,
                                                   dp->conversion, type, flags,
                                                   width,
                                                   has_precision,
                                                   precision, pad_ourselves);

                                if (maxlen < tmp_length)
                                  {
                                    /* Make more room.  But try to do through
                                       this reallocation only once.  */
                                    size_t bigger_need =
                                      xsum (length,
                                            xsum (tmp_length,
                                                  TCHARS_PER_DCHAR - 1)
                                            / TCHARS_PER_DCHAR);
                                    /* And always grow proportionally.
                                       (There may be several arguments, each
                                       needing a little more room than the
                                       previous one.)  */
                                    size_t bigger_need2 =
                                      xsum (xtimes (allocated, 2), 12);
                                    if (bigger_need < bigger_need2)
                                      bigger_need = bigger_need2;
                                    ENSURE_ALLOCATION (bigger_need);
                                    continue;
                                  }
# endif
                              }
                            else
                              count = retcount;
                          }
                      }
#endif

                    /* Attempt to handle failure.  */
                    if (count < 0)
                      {
                        /* SNPRINTF or sprintf failed.  Save and use the errno
                           that it has set, if any.  */
                        int saved_errno = errno;
                        if (saved_errno == 0)
                          {
                            if (dp->conversion == 'c' || dp->conversion == 's')
                              saved_errno = EILSEQ;
                            else
                              saved_errno = EINVAL;
                          }

                        if (!(result == resultbuf || result == NULL))
                          free (result);
                        if (buf_malloced != NULL)
                          free (buf_malloced);
                        CLEANUP ();

                        errno = saved_errno;
                        return NULL;
                      }

#if USE_SNPRINTF
                    /* Handle overflow of the allocated buffer.
                       If such an overflow occurs, a C99 compliant snprintf()
                       returns a count >= maxlen.  However, a non-compliant
                       snprintf() function returns only count = maxlen - 1.  To
                       cover both cases, test whether count >= maxlen - 1.  */
                    if ((unsigned int) count + 1 >= maxlen)
                      {
                        /* If maxlen already has attained its allowed maximum,
                           allocating more memory will not increase maxlen.
                           Instead of looping, bail out.  */
                        if (maxlen == INT_MAX / TCHARS_PER_DCHAR)
                          goto overflow;
                        else
                          {
                            /* Need at least (count + 1) * sizeof (TCHAR_T)
                               bytes.  (The +1 is for the trailing NUL.)
                               But ask for (count + 2) * sizeof (TCHAR_T)
                               bytes, so that in the next round, we likely get
                                 maxlen > (unsigned int) count + 1
                               and so we don't get here again.
                               And allocate proportionally, to avoid looping
                               eternally if snprintf() reports a too small
                               count.  */
                            size_t n =
                              xmax (xsum (length,
                                          ((unsigned int) count + 2
                                           + TCHARS_PER_DCHAR - 1)
                                          / TCHARS_PER_DCHAR),
                                    xtimes (allocated, 2));

                            ENSURE_ALLOCATION (n);
                            continue;
                          }
                      }
#endif

#if NEED_PRINTF_UNBOUNDED_PRECISION
                    if (prec_ourselves)
                      {
                        /* Handle the precision.  */
                        TCHAR_T *prec_ptr =
# if USE_SNPRINTF
                          (TCHAR_T *) (result + length);
# else
                          tmp;
# endif
                        size_t prefix_count;
                        size_t move;

                        prefix_count = 0;
                        /* Put the additional zeroes after the sign.  */
                        if (count >= 1
                            && (*prec_ptr == '-' || *prec_ptr == '+'
                                || *prec_ptr == ' '))
                          prefix_count = 1;
                        /* Put the additional zeroes after the 0x prefix if
                           (flags & FLAG_ALT) || (dp->conversion == 'p').  */
                        else if (count >= 2
                                 && prec_ptr[0] == '0'
                                 && (prec_ptr[1] == 'x' || prec_ptr[1] == 'X'))
                          prefix_count = 2;

                        move = count - prefix_count;
                        if (precision > move)
                          {
                            /* Insert zeroes.  */
                            size_t insert = precision - move;
                            TCHAR_T *prec_end;

# if USE_SNPRINTF
                            size_t n =
                              xsum (length,
                                    (count + insert + TCHARS_PER_DCHAR - 1)
                                    / TCHARS_PER_DCHAR);
                            length += (count + TCHARS_PER_DCHAR - 1) / TCHARS_PER_DCHAR;
                            ENSURE_ALLOCATION (n);
                            length -= (count + TCHARS_PER_DCHAR - 1) / TCHARS_PER_DCHAR;
                            prec_ptr = (TCHAR_T *) (result + length);
# endif

                            prec_end = prec_ptr + count;
                            prec_ptr += prefix_count;

                            while (prec_end > prec_ptr)
                              {
                                prec_end--;
                                prec_end[insert] = prec_end[0];
                              }

                            prec_end += insert;
                            do
                              *--prec_end = '0';
                            while (prec_end > prec_ptr);

                            count += insert;
                          }
                      }
#endif

#if !USE_SNPRINTF
                    if (count >= tmp_length)
                      /* tmp_length was incorrectly calculated - fix the
                         code above!  */
                      abort ();
#endif

#if !DCHAR_IS_TCHAR
                    /* Convert from TCHAR_T[] to DCHAR_T[].  */
                    if (dp->conversion == 'c' || dp->conversion == 's')
                      {
                        /* type = TYPE_CHAR or TYPE_WIDE_CHAR or TYPE_STRING
                           TYPE_WIDE_STRING.
                           The result string is not certainly ASCII.  */
                        const TCHAR_T *tmpsrc;
                        DCHAR_T *tmpdst;
                        size_t tmpdst_len;
                        /* This code assumes that TCHAR_T is 'char'.  */
                        verify (sizeof (TCHAR_T) == 1);
# if USE_SNPRINTF
                        tmpsrc = (TCHAR_T *) (result + length);
# else
                        tmpsrc = tmp;
# endif
                        tmpdst =
                          DCHAR_CONV_FROM_ENCODING (locale_charset (),
                                                    iconveh_question_mark,
                                                    tmpsrc, count,
                                                    NULL,
                                                    NULL, &tmpdst_len);
                        if (tmpdst == NULL)
                          {
                            int saved_errno = errno;
                            if (!(result == resultbuf || result == NULL))
                              free (result);
                            if (buf_malloced != NULL)
                              free (buf_malloced);
                            CLEANUP ();
                            errno = saved_errno;
                            return NULL;
                          }
                        ENSURE_ALLOCATION (xsum (length, tmpdst_len));
                        DCHAR_CPY (result + length, tmpdst, tmpdst_len);
                        free (tmpdst);
                        count = tmpdst_len;
                      }
                    else
                      {
                        /* The result string is ASCII.
                           Simple 1:1 conversion.  */
# if USE_SNPRINTF
                        /* If sizeof (DCHAR_T) == sizeof (TCHAR_T), it's a
                           no-op conversion, in-place on the array starting
                           at (result + length).  */
                        if (sizeof (DCHAR_T) != sizeof (TCHAR_T))
# endif
                          {
                            const TCHAR_T *tmpsrc;
                            DCHAR_T *tmpdst;
                            size_t n;

# if USE_SNPRINTF
                            if (result == resultbuf)
                              {
                                tmpsrc = (TCHAR_T *) (result + length);
                                /* ENSURE_ALLOCATION will not move tmpsrc
                                   (because it's part of resultbuf).  */
                                ENSURE_ALLOCATION (xsum (length, count));
                              }
                            else
                              {
                                /* ENSURE_ALLOCATION will move the array
                                   (because it uses realloc().  */
                                ENSURE_ALLOCATION (xsum (length, count));
                                tmpsrc = (TCHAR_T *) (result + length);
                              }
# else
                            tmpsrc = tmp;
                            ENSURE_ALLOCATION (xsum (length, count));
# endif
                            tmpdst = result + length;
                            /* Copy backwards, because of overlapping.  */
                            tmpsrc += count;
                            tmpdst += count;
                            for (n = count; n > 0; n--)
                              *--tmpdst = *--tmpsrc;
                          }
                      }
#endif

#if DCHAR_IS_TCHAR && !USE_SNPRINTF
                    /* Make room for the result.  */
                    if (count > allocated - length)
                      {
                        /* Need at least count elements.  But allocate
                           proportionally.  */
                        size_t n =
                          xmax (xsum (length, count), xtimes (allocated, 2));

                        ENSURE_ALLOCATION (n);
                      }
#endif

                    /* Here count <= allocated - length.  */

                    /* Perform padding.  */
#if !DCHAR_IS_TCHAR || ENABLE_UNISTDIO || NEED_PRINTF_FLAG_LEFTADJUST || NEED_PRINTF_FLAG_ZERO || NEED_PRINTF_UNBOUNDED_PRECISION
                    if (pad_ourselves && has_width)
                      {
                        size_t w;
# if ENABLE_UNISTDIO
                        /* Outside POSIX, it's preferable to compare the width
                           against the number of _characters_ of the converted
                           value.  */
                        w = DCHAR_MBSNLEN (result + length, count);
# else
                        /* The width is compared against the number of _bytes_
                           of the converted value, says POSIX.  */
                        w = count;
# endif
                        if (w < width)
                          {
                            size_t pad = width - w;

                            /* Make room for the result.  */
                            if (xsum (count, pad) > allocated - length)
                              {
                                /* Need at least count + pad elements.  But
                                   allocate proportionally.  */
                                size_t n =
                                  xmax (xsum3 (length, count, pad),
                                        xtimes (allocated, 2));

# if USE_SNPRINTF
                                length += count;
                                ENSURE_ALLOCATION (n);
                                length -= count;
# else
                                ENSURE_ALLOCATION (n);
# endif
                              }
                            /* Here count + pad <= allocated - length.  */

                            {
# if !DCHAR_IS_TCHAR || USE_SNPRINTF
                              DCHAR_T * const rp = result + length;
# else
                              DCHAR_T * const rp = tmp;
# endif
                              DCHAR_T *p = rp + count;
                              DCHAR_T *end = p + pad;
                              DCHAR_T *pad_ptr;
# if !DCHAR_IS_TCHAR || ENABLE_UNISTDIO
                              if (dp->conversion == 'c'
                                  || dp->conversion == 's')
                                /* No zero-padding for string directives.  */
                                pad_ptr = NULL;
                              else
# endif
                                {
                                  pad_ptr = (*rp == '-' ? rp + 1 : rp);
                                  /* No zero-padding of "inf" and "nan".  */
                                  if ((*pad_ptr >= 'A' && *pad_ptr <= 'Z')
                                      || (*pad_ptr >= 'a' && *pad_ptr <= 'z'))
                                    pad_ptr = NULL;
                                }
                              /* The generated string now extends from rp to p,
                                 with the zero padding insertion point being at
                                 pad_ptr.  */

                              count = count + pad; /* = end - rp */

                              if (flags & FLAG_LEFT)
                                {
                                  /* Pad with spaces on the right.  */
                                  for (; pad > 0; pad--)
                                    *p++ = ' ';
                                }
                              else if ((flags & FLAG_ZERO) && pad_ptr != NULL)
                                {
                                  /* Pad with zeroes.  */
                                  DCHAR_T *q = end;

                                  while (p > pad_ptr)
                                    *--q = *--p;
                                  for (; pad > 0; pad--)
                                    *p++ = '0';
                                }
                              else
                                {
                                  /* Pad with spaces on the left.  */
                                  DCHAR_T *q = end;

                                  while (p > rp)
                                    *--q = *--p;
                                  for (; pad > 0; pad--)
                                    *p++ = ' ';
                                }
                            }
                          }
                      }
#endif

                    /* Here still count <= allocated - length.  */

#if !DCHAR_IS_TCHAR || USE_SNPRINTF
                    /* The snprintf() result did fit.  */
#else
                    /* Append the sprintf() result.  */
                    memcpy (result + length, tmp, count * sizeof (DCHAR_T));
#endif
#if !USE_SNPRINTF
                    if (tmp != tmpbuf)
                      free (tmp);
#endif

#if NEED_PRINTF_DIRECTIVE_F
                    if (dp->conversion == 'F')
                      {
                        /* Convert the %f result to upper case for %F.  */
                        DCHAR_T *rp = result + length;
                        size_t rc;
                        for (rc = count; rc > 0; rc--, rp++)
                          if (*rp >= 'a' && *rp <= 'z')
                            *rp = *rp - 'a' + 'A';
                      }
#endif

                    length += count;
                    break;
                  }
                errno = orig_errno;
#undef pad_ourselves
#undef prec_ourselves
              }
          }
      }

    /* Add the final NUL.  */
    ENSURE_ALLOCATION (xsum (length, 1));
    result[length] = '\0';

    if (result != resultbuf && length + 1 < allocated)
      {
        /* Shrink the allocated memory if possible.  */
        DCHAR_T *memory;

        memory = (DCHAR_T *) realloc (result, (length + 1) * sizeof (DCHAR_T));
        if (memory != NULL)
          result = memory;
      }

    if (buf_malloced != NULL)
      free (buf_malloced);
    CLEANUP ();
    *lengthp = length;
    /* Note that we can produce a big string of a length > INT_MAX.  POSIX
       says that snprintf() fails with errno = EOVERFLOW in this case, but
       that's only because snprintf() returns an 'int'.  This function does
       not have this limitation.  */
    return result;

#if USE_SNPRINTF
  overflow:
    if (!(result == resultbuf || result == NULL))
      free (result);
    if (buf_malloced != NULL)
      free (buf_malloced);
    CLEANUP ();
    errno = EOVERFLOW;
    return NULL;
#endif

  out_of_memory:
    if (!(result == resultbuf || result == NULL))
      free (result);
    if (buf_malloced != NULL)
      free (buf_malloced);
  out_of_memory_1:
    CLEANUP ();
    errno = ENOMEM;
    return NULL;
  }
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.