term_do_write(const char *buf, uint len)
{
  //check e.g. if progress indication is following by CR
  //printf("[%ld] write %02X...%02X\n", mtime(), *buf, buf[len - 1]);

  // Reset cursor blinking.
  term.cblinker = 1;
  term_schedule_cblink();

  short oldy = term.curs.y;

  uint pos = 0;
  while (pos < len) {
    uchar c = buf[pos++];

   /*
    * If we're printing, add the character to the printer buffer.
    */
    if (term.printing) {
      if (term.printbuf_pos >= term.printbuf_size) {
        term.printbuf_size = term.printbuf_size * 4 + 4096;
        term.printbuf = renewn(term.printbuf, term.printbuf_size);
      }
      term.printbuf[term.printbuf_pos++] = c;

     /*
      * If we're in print-only mode, we use a much simpler state machine 
      * designed only to recognise the ESC[4i termination sequence.
      */
      if (term.only_printing) {
        if (c == '\e')
          term.print_state = 1;
        else if (c == '[' && term.print_state == 1)
          term.print_state = 2;
        else if (c == '4' && term.print_state == 2)
          term.print_state = 3;
        else if (c == 'i' && term.print_state == 3) {
          term.printbuf_pos -= 4;
          term_print_finish();
        }
        else
          term.print_state = 0;
        continue;
      }
    }

    switch (term.state) {
      when NORMAL: {
        wchar wc;

        if (term.curs.oem_acs && !memchr("\e\n\r\b", c, 4)) {
          if (term.curs.oem_acs == 2)
            c |= 0x80;
          write_ucschar(0, cs_btowc_glyph(c), 1);
          continue;
        }

        // handle NRC single shift and NRC GR invocation;
        // maybe we should handle control characters first?
        short cset = term.curs.csets[term.curs.gl];
        if (term.curs.cset_single != CSET_ASCII && c > 0x20 && c < 0xFF) {
          cset = term.curs.cset_single;
          term.curs.cset_single = CSET_ASCII;
        }
        else if (term.decnrc_enabled
         && term.curs.gr && term.curs.csets[term.curs.gr] != CSET_ASCII
         && !term.curs.oem_acs && !term.curs.utf
         && c >= 0x80 && c < 0xFF) {
          // tune C1 behaviour to mimic xterm
          if (c < 0xA0)
            continue;

          c &= 0x7F;
          cset = term.curs.csets[term.curs.gr];
        }

        if (term.vt52_mode) {
          if (term.vt52_mode > 1)
            cset = CSET_VT52DRW;
          else
            cset = CSET_ASCII;
        }
        else if (cset == CSET_DECSUPP)
          cset = term.curs.decsupp;

        switch (cs_mb1towc(&wc, c)) {
          when 0: // NUL or low surrogate
            if (wc)
              pos--;
          when -1: // Encoding error
            if (!tek_mode)
              write_error();
            if (term.in_mb_char || term.high_surrogate)
              pos--;
            term.high_surrogate = 0;
            term.in_mb_char = false;
            cs_mb1towc(0, 0); // Clear decoder state
            continue;
          when -2: // Incomplete character
            term.in_mb_char = true;
            continue;
        }

        term.in_mb_char = false;

        // Fetch previous high surrogate
        wchar hwc = term.high_surrogate;
        term.high_surrogate = 0;

        if (is_low_surrogate(wc)) {
          if (hwc) {
#if HAS_LOCALES
            int width = (cfg.charwidth % 10)
                        ? xcwidth(combine_surrogates(hwc, wc)) :
# ifdef __midipix__
                        wcwidth(combine_surrogates(hwc, wc));
# else
                        wcswidth((wchar[]){hwc, wc}, 2);
# endif
#else
            int width = xcwidth(combine_surrogates(hwc, wc));
#endif
#ifdef support_triple_width
            // do not handle triple-width here
            //if (term.curs.width)
            //  width = term.curs.width % 10;
#endif
            write_ucschar(hwc, wc, width);
          }
          else
            write_error();
          continue;
        }

        if (hwc) // Previous high surrogate not followed by low one
          write_error();

        // ASCII shortcut for some speedup (~5%), earliest applied here
        if (wc >= ' ' && wc <= 0x7E && cset == CSET_ASCII) {
          write_ucschar(0, wc, 1);
          continue;
        }

        if (is_high_surrogate(wc)) {
          term.high_surrogate = wc;
          continue;
        }

        // Non-characters
        if (wc == 0xFFFE || wc == 0xFFFF) {
          write_error();
          continue;
        }

        // Everything else
        wchar NRC(wchar * map)
        {
          static char * rpl = "#@[\\]^_`{|}~";
          char * match = strchr(rpl, c);
          if (match)
            return map[match - rpl];
          else
            return wc;
        }

        cattrflags asav = term.curs.attr.attr;

        switch (cset) {
          when CSET_VT52DRW:  // VT52 "graphics" mode
            if (0x5E <= wc && wc <= 0x7E) {
              uchar dispcode = 0;
              uchar gcode = 0;
              if ('l' <= wc && wc <= 's') {
                dispcode = wc - 'l' + 1;
                gcode = 13;
              }
              else if ('c' <= wc && wc <= 'e') {
                dispcode = 0xF;
              }
              wc = W("^ ▮⅟³⁵⁷°±→…÷↓⎺⎺⎻⎻⎼⎼⎽⎽₀₁₂₃₄₅₆₇₈₉¶") [c - 0x5E];
              term.curs.attr.attr |= ((cattrflags)dispcode) << ATTR_GRAPH_SHIFT;
              if (gcode) {
                // extend graph encoding with unused font number
                term.curs.attr.attr &= ~FONTFAM_MASK;
                term.curs.attr.attr |= (cattrflags)gcode << ATTR_FONTFAM_SHIFT;
              }
            }
          when CSET_LINEDRW:  // VT100 line drawing characters
            if (0x60 <= wc && wc <= 0x7E) {
              wchar dispwc = win_linedraw_char(wc - 0x60);
#define draw_vt100_line_drawing_chars
#ifdef draw_vt100_line_drawing_chars
              if ('j' <= wc && wc <= 'x') {
                static uchar linedraw_code[31] = {
                  0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
#if __GNUC__ >= 5
                  0b1001, 0b1100, 0b0110, 0b0011, 0b1111,  // ┘┐┌└┼
                  0x10, 0x20, 0b1010, 0x40, 0x50,          // ⎺⎻─⎼⎽
                  0b0111, 0b1101, 0b1011, 0b1110, 0b0101,  // ├┤┴┬│
#else // < 4.3
                  0x09, 0x0C, 0x06, 0x03, 0x0F,  // ┘┐┌└┼
                  0x10, 0x20, 0x0A, 0x40, 0x50,  // ⎺⎻─⎼⎽
                  0x07, 0x0D, 0x0B, 0x0E, 0x05,  // ├┤┴┬│
#endif
                  0, 0, 0, 0, 0, 0
                };
                uchar dispcode = linedraw_code[wc - 0x60];
                if (dispcode) {
                  uchar gcode = 11;
                  if (dispcode >> 4) {
                    dispcode >>= 4;
                    gcode++;
                  }
                  term.curs.attr.attr |= ((cattrflags)dispcode) << ATTR_GRAPH_SHIFT;
                  // extend graph encoding with unused font numbers
                  term.curs.attr.attr &= ~FONTFAM_MASK;
                  term.curs.attr.attr |= (cattrflags)gcode << ATTR_FONTFAM_SHIFT;
                }
              }
#endif
              wc = dispwc;
            }
          when CSET_TECH:  // DEC Technical character set
            if (c > ' ' && c < 0x7F) {
              // = W("⎷┌─⌠⌡│⎡⎣⎤⎦⎛⎝⎞⎠⎨⎬╲╱≤≠≥∫∴∝∞÷Δ∇ΦΓ∼≃Θ×Λ⇔⇒≡ΠΨΣ√ΩΞΥ⊂⊃∩∪∧∨¬αβχδεφγηιθκλν∂πψρστƒωξυζ←↑→↓")
              // = W("⎷┌─⌠⌡│⎡⎣⎤⎦⎛⎝⎞⎠⎨⎬╶╶╲╱╴╴╳≤≠≥∫∴∝∞÷Δ∇ΦΓ∼≃Θ×Λ⇔⇒≡ΠΨΣ√ΩΞΥ⊂⊃∩∪∧∨¬αβχδεφγηιθκλν∂πψρστƒωξυζ←↑→↓")
              // = W("⎷┌─⌠⌡│⎡⎣⎤⎦⎧⎩⎫⎭⎨⎬╶╶╲╱╴╴╳≤≠≥∫∴∝∞÷Δ∇ΦΓ∼≃Θ×Λ⇔⇒≡ΠΨΣ√ΩΞΥ⊂⊃∩∪∧∨¬αβχδεφγηιθκλν∂πψρστƒωξυζ←↑→↓")
              wc = W("⎷┌─⌠⌡│⎡⎣⎤⎦⎧⎩⎫⎭⎨⎬╶╶╲╱╴╴╳≤≠≥∫∴∝∞÷  ΦΓ∼≃Θ×Λ⇔⇒≡ΠΨΣ√ΩΞΥ⊂⊃∩∪∧∨¬αβχδεφγηιθκλν∂πψρστƒωξυζ←↑→↓")
                   [c - ' ' - 1];
              uchar dispcode = 0;
              if (c <= 0x37) {
                static uchar techdraw_code[23] = {
                  0xE,                          // square root base
                  0, 0, 0, 0, 0,
                  0x8, 0x9, 0xA, 0xB,           // square bracket corners
                  0, 0, 0, 0,                   // curly bracket hooks
                  0, 0,                         // curly bracket middle pieces
                  0x1, 0x2, 0, 0, 0x5, 0x6, 0x7 // sum segments
                };
                dispcode = techdraw_code[c - 0x21];
              }
              else if (c == 0x44)
                dispcode = 0xC;
              else if (c == 0x45)
                dispcode = 0xD;
              term.curs.attr.attr |= ((cattrflags)dispcode) << ATTR_GRAPH_SHIFT;
            }
          when CSET_NL:
            wc = NRC(W("£¾ĳ½|^_`¨ƒ¼´"));  // Dutch
          when CSET_FI:
            wc = NRC(W("#@ÄÖÅÜ_éäöåü"));  // Finnish
          when CSET_FR:
            wc = NRC(W("£à°ç§^_`éùè¨"));  // French
          when CSET_CA:
            wc = NRC(W("#àâçêî_ôéùèû"));  // French Canadian
          when CSET_DE:
            wc = NRC(W("#§ÄÖÜ^_`äöüß"));  // German
          when CSET_IT:
            wc = NRC(W("£§°çé^_ùàòèì"));  // Italian
          when CSET_NO:
            wc = NRC(W("#ÄÆØÅÜ_äæøåü"));  // Norwegian/Danish
          when CSET_PT:
            wc = NRC(W("#@ÃÇÕ^_`ãçõ~"));  // Portuguese
          when CSET_ES:
            wc = NRC(W("£§¡Ñ¿^_`°ñç~"));  // Spanish
          when CSET_SE:
            wc = NRC(W("#ÉÄÖÅÜ_éäöåü"));  // Swedish
          when CSET_CH:
            wc = NRC(W("ùàéçêîèôäöüû"));  // Swiss
          when CSET_DECSPGR   // DEC Supplemental Graphic
            or CSET_DECSUPP:  // DEC Supplemental (user-preferred in VT*)
            if (c > ' ' && c < 0x7F) {
              wc = W("¡¢£¥§¤©ª«°±²³µ¶·¹º»¼½¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÑÒÓÔÕÖŒØÙÚÛÜŸßàáâãäåæçèéêëìíîïñòóôõöœøùúûüÿ")
                   [c - ' ' - 1];
            }
          // 96-character sets (UK / xterm 336)
          when CSET_GBCHR:  // NRC United Kingdom
            if (c >= ' ' && c <= 0x7F) {
              wc = W(" ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ")
                   [c - ' '];
            }
          when CSET_ISO_Latin_Cyrillic:
            if (c >= ' ' && c <= 0x7F) {
              wc = W(" ЁЂЃЄЅІЇЈЉЊЋЌ­ЎЏАБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмнопрстуфхцчшщъыьэюя№ёђѓєѕіїјљњћќ§ўџ")
                   [c - ' '];
            }
          when CSET_ISO_Greek_Supp:
            if (c >= ' ' && c <= 0x7F) {
              wc = W(" ‘’£€₯¦§¨©ͺ«¬­―°±²³΄΅Ά·ΈΉΊ»Ό½ΎΏΐΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩΪΫάέήίΰαβγδεζηθικλμνξοπρςστυφχψωϊϋόύώ")
                   [c - ' '];
            }
          when CSET_ISO_Hebrew:
            if (c >= ' ' && c <= 0x7F) {
              wc = W(" ¢£¤¥¦§¨©×«¬­®¯°±²³´µ¶·¸¹÷»¼½¾‗אבגדהוזחטיךכלםמןנסעףפץצקרשת‎‏")
                   [c - ' '];
            }
          when CSET_ISO_Latin_5:
            if (c >= ' ' && c <= 0x7F) {
              wc = W(" ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏĞÑÒÓÔÕÖ×ØÙÚÛÜİŞßàáâãäåæçèéêëìíîïğñòóôõö÷øùúûüışÿ")
                   [c - ' '];
            }
          when CSET_DEC_Greek_Supp:
            if (c >= ' ' && c <= 0x7F) {
              wc = W(" ¡¢£¥§¤©ª«°±²³µ¶·¹º»¼½¿ϊΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩάέήίόϋαβγδεζηθικλμνξοπρστυφχψωςύώ΄")
                   [c - ' '];
            }
          when CSET_DEC_Hebrew_Supp:
            if (c >= ' ' && c <= 0x7F) {
              wc = W(" ¡¢£¥§¨©×«°±²³µ¶·¹÷»¼½¿אבגדהוזחטיךכלםמןנסעףפץצקרשת")
                   [c - ' '];
            }
          when CSET_DEC_Turkish_Supp:
            if (c >= ' ' && c <= 0x7F) {
              wc = W(" ¡¢£¥§¨©ª«İ°±²³µ¶·¹º»¼½ı¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏĞÑÒÓÔÕÖŒØÙÚÛÜŸŞßàáâãäåæçèéêëìíîïğñòóôõöœøùúûüÿş")
                   [c - ' '];
            }
          when CSET_DEC_Cyrillic:
            if (c >= ' ' && c <= 0x7F) {
              wc = W(" юабцдефгхийклмнопярстужвьызшэщчъЮАБЦДЕФГХИЙКЛМНОПЯРСТУЖВЬЫЗШЭЩЧЪ")
                   [c - ' '];
            }
          when CSET_NRCS_Greek:
            if (c >= ' ' && c <= 0x7F) {
              wc = W(" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`ΑΒΓΔΕΖΗΘΙΚΛΜΝΧΟΠΡΣΤΥΦΞΨΩ{|}~")
                   [c - ' '];
            }
          when CSET_NRCS_Hebrew:
            if (c >= ' ' && c <= 0x7F) {
              wc = W(" !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_אבגדהוזחטיךכלםמןנסעףפץצקרשת{|}~")
                   [c - ' '];
            }
          when CSET_NRCS_Turkish:
            if (c >= ' ' && c <= 0x7F) {
              wc = W(" !\"#$%ğ'()*+,-./0123456789:;<=>?İABCDEFGHIJKLMNOPQRSTUVWXYZŞÖÇÜ_Ğabcdefghijklmnopqrstuvwxyzşöçü")
                   [c - ' '];
            }
          otherwise: ;
        }

        // Some more special graphic renderings
        if (wc >= 0x2580 && wc <= 0x259F) {
          // Block Elements (U+2580-U+259F)
          // ▀▁▂▃▄▅▆▇█▉▊▋▌▍▎▏▐░▒▓▔▕▖▗▘▙▚▛▜▝▞▟
          term.curs.attr.attr |= ((cattrflags)(wc & 0xF)) << ATTR_GRAPH_SHIFT;
          uchar gcode = 14 + ((wc >> 4) & 1);
          // extend graph encoding with unused font numbers
          term.curs.attr.attr &= ~FONTFAM_MASK;
          term.curs.attr.attr |= (cattrflags)gcode << ATTR_FONTFAM_SHIFT;
        }
#ifdef draw_powerline_geometric_symbols
#warning graphical results of this approach are unpleasant; not enabled
        else if (wc >= 0xE0B0 && wc <= 0xE0BF && wc != 0xE0B5 && wc != 0xE0B7) {
          // draw geometric full-cell Powerline symbols,
          // to avoid artefacts at their borders (#943)
          term.curs.attr.attr &= ~FONTFAM_MASK;
          term.curs.attr.attr |= (cattrflags)13 << ATTR_FONTFAM_SHIFT;
          term.curs.attr.attr |= (cattrflags)15 << ATTR_GRAPH_SHIFT;
        }
#endif

        // Determine width of character to be rendered
        int width;
        if (term.wide_indic && wc >= 0x0900 && indicwide(wc))
          width = 2;
        else if (term.wide_extra && wc >= 0x2000 && extrawide(wc)) {
          width = 2;
          // Note: this check is currently not implemented for
          // non-BMP characters (see case if is_low_surrogate(wc) above)
          if (win_char_width(wc, term.curs.attr.attr) < 2)
            term.curs.attr.attr |= TATTR_EXPAND;
        }
        else {
#if HAS_LOCALES
          if (cfg.charwidth % 10)
            width = xcwidth(wc);
          else
            width = wcwidth(wc);
#ifdef support_triple_width
          // do not handle triple-width here
          //if (term.curs.width)
          //  width = term.curs.width % 10;
#endif
# ifdef hide_isolate_marks
          // force bidi isolate marks to be zero-width;
          // however, this is inconsistent with locale width
          if (wc >= 0x2066 && wc <= 0x2069)
            width = 0;  // bidi isolate marks
# endif
#else
          width = xcwidth(wc);
#endif
        }
        if (width < 0 && cfg.printable_controls) {
          if (wc >= 0x80 && wc < 0xA0)
            width = 1;
          else if (wc < ' ' && cfg.printable_controls > 1)
            width = 1;
        }

        // Auto-expanded glyphs
        if (width == 2
            // && wcschr(W("〈〉《》「」『』【】〒〓〔〕〖〗〘〙〚〛"), wc)
            && wc >= 0x3008 && wc <= 0x301B && (wc | 1) != 0x3013
            && win_char_width(wc, term.curs.attr.attr) < 2
            // ensure symmetric handling of matching brackets
            && win_char_width(wc ^ 1, term.curs.attr.attr) < 2)
        {
          term.curs.attr.attr |= TATTR_EXPAND;
        }

        // Control characters
        if (wc < 0x20 || wc == 0x7F) {
          if (!do_ctrl(wc) && c == wc) {
            wc = cs_btowc_glyph(c);
            if (wc != c)
              write_ucschar(0, wc, 1);
            else if (cfg.printable_controls > 1)
              goto goon;
          }
          term.curs.attr.attr = asav;
          continue;

          goon:;
        }

        // Finally, write it and restore cursor attribute
        write_ucschar(0, wc, width);
        term.curs.attr.attr = asav;
      } // end term_write switch (term.state) when NORMAL

      when VT52_Y:
        term.cmd_len = 0;
        term_push_cmd(c);
        term.state = VT52_X;

      when VT52_X:
        term_push_cmd(c);
        do_vt52_move();

      when VT52_FG:
        do_vt52_colour(true, c);

      when VT52_BG:
        do_vt52_colour(false, c);

      when TEK_ESCAPE:
        tek_esc(c);

      when TEK_ADDRESS0 or TEK_ADDRESS:
        if (c < ' ')
          tek_ctrl(c);
        else if (tek_mode == TEKMODE_SPECIAL_PLOT && term.state == TEK_ADDRESS0) {
          term.state = TEK_ADDRESS;
          term.cmd_len = 0;
          tek_intensity(c & 0x40, c & 0x37);
        }
        //else if (term.cmd_len > 5) {
        // no length checking here, interferes with previous OSC!
        // let term_push_cmd do it
        //}
        //else if (!(c & 0x60)) {
        // no error checking here, let tek_address catch it
        //}
        else {
          if (term.state == TEK_ADDRESS0) {
            term.state = TEK_ADDRESS;
            term.cmd_len = 0;
          }

          term_push_cmd(c);
          if ((c & 0x60) == 0x40) {
            tek_address(term.cmd_buf);
            term.state = TEK_ADDRESS0;
            if (tek_mode == TEKMODE_GRAPH0)
              tek_mode = TEKMODE_GRAPH;
          }
        }

      when TEK_INCREMENTAL:
        if (c < ' ')
          tek_ctrl(c);
        else if (c == ' ' || c == 'P')
          tek_pen(c == 'P');
        else if (strchr("DEAIHJBF", c))
          tek_step(c);

      when ESCAPE or CMD_ESCAPE:
        if (term.vt52_mode)
          do_vt52(c);
        else if (c < 0x20)
          do_ctrl(c);
        else if (c < 0x30) {
          //term.esc_mod = term.esc_mod ? 0xFF : c;
          if (term.esc_mod) {
            esc_mod0 = term.esc_mod;
            esc_mod1 = c;
            term.esc_mod = 0xFF;
          }
          else {
            esc_mod0 = 0;
            esc_mod1 = 0;
            term.esc_mod = c;
          }
        }
        else if (c == '\\' && term.state == CMD_ESCAPE) {
          /* Process DCS or OSC sequence if we see ST. */
          do_cmd();
          term.state = NORMAL;
        }
        else {
          do_esc(c);
          // term.state: NORMAL/CSI_ARGS/OSC_START/DCS_START/IGNORE_STRING
        }

      when CSI_ARGS:
        if (c < 0x20)
          do_ctrl(c);
        else if (c == ';') {
          if (term.csi_argc < lengthof(term.csi_argv))
            term.csi_argc++;
        }
        else if (c == ':') {
          // support colon-separated sub parameters as specified in
          // ISO/IEC 8613-6 (ITU Recommendation T.416)
          uint i = term.csi_argc - 1;
          term.csi_argv[i] |= SUB_PARS;
          if (term.csi_argc < lengthof(term.csi_argv))
            term.csi_argc++;
        }
        else if (c >= '0' && c <= '9') {
          uint i = term.csi_argc - 1;
          if (i < lengthof(term.csi_argv)) {
            term.csi_argv[i] = 10 * term.csi_argv[i] + c - '0';
            if ((int)term.csi_argv[i] < 0)
              term.csi_argv[i] = INT_MAX;  // capture overflow
            term.csi_argv_defined[i] = 1;
          }
        }
        else if (c < 0x40) {
          //term.esc_mod = term.esc_mod ? 0xFF : c;
          if (term.esc_mod) {
            esc_mod0 = term.esc_mod;
            esc_mod1 = c;
            term.esc_mod = 0xFF;
          }
          else {
            esc_mod0 = 0;
            esc_mod1 = 0;
            term.esc_mod = c;
          }
        }
        else {
          do_csi(c);
          term.state = NORMAL;
        }

      when OSC_START:
        term.cmd_len = 0;
        switch (c) {
          when 'P':  /* Linux palette sequence */
            term.state = OSC_PALETTE;
          when 'R':  /* Linux palette reset */
            win_reset_colours();
            term.state = NORMAL;
          when 'I':  /* OSC set icon file (dtterm, shelltool) */
            term.cmd_num = 7773;
            term.state = OSC_NUM;
          when 'L':  /* OSC set icon label (dtterm, shelltool) */
            term.cmd_num = 1;
            term.state = OSC_NUM;
          when 'l':  /* OSC set window title (dtterm, shelltool) */
            term.cmd_num = 2;
            term.state = OSC_NUM;
          when '0' ... '9':  /* OSC command number */
            term.cmd_num = c - '0';
            term.state = OSC_NUM;
          when ';':
            term.cmd_num = 0;
            term.state = CMD_STRING;
          when '\a':
            term.state = NORMAL;
          when '\e':
            term.state = ESCAPE;
          when '\n' or '\r':
            term.state = IGNORE_STRING;
          otherwise:
            term.state = IGNORE_STRING;
        }

      when OSC_NUM:
        switch (c) {
          when '0' ... '9':  /* OSC command number */
            term.cmd_num = term.cmd_num * 10 + c - '0';
            if (term.cmd_num < 0)
              term.cmd_num = -99;  // prevent wrong valid param
          when ';':
            term.state = CMD_STRING;
          when '\a':
            do_cmd();
            term.state = NORMAL;
          when '\e':
            term.state = CMD_ESCAPE;
          when '\n' or '\r':
            term.state = IGNORE_STRING;
          otherwise:
            term.state = IGNORE_STRING;
        }

      when OSC_PALETTE:
        if (isxdigit(c)) {
          // The dodgy Linux palette sequence: keep going until we have
          // seven hexadecimal digits.
          term_push_cmd(c);
          if (term.cmd_len == 7) {
            uint n, r, g, b;
            sscanf(term.cmd_buf, "%1x%2x%2x%2x", &n, &r, &g, &b);
            win_set_colour(n, make_colour(r, g, b));
            term.state = NORMAL;
          }
        }
        else {
          // End of sequence. Put the character back unless the sequence was
          // terminated properly.
          term.state = NORMAL;
          if (c != '\a') {
            pos--;
            continue;
          }
        }

      when CMD_STRING:
        switch (c) {
          when '\a':
            do_cmd();
            term.state = NORMAL;
          when '\e':
            term.state = CMD_ESCAPE;
          when '\n' or '\r':
            // accept new lines in OSC strings
            if (term.cmd_num != 1337)
              term_push_cmd(c);
            // else ignore new lines in base64-encoded images
          otherwise:
            term_push_cmd(c);
        }

      when IGNORE_STRING:
        switch (c) {
          when '\a':
            term.state = NORMAL;
          when '\e':
            term.state = ESCAPE;
          when '\n' or '\r':
            // keep IGNORE_STRING
            ;
        }

      when DCS_START:
        term.cmd_num = -1;
        term.cmd_len = 0;
        term.dcs_cmd = 0;
        switch (c) {
          when '@' ... '~':  /* DCS cmd final byte */
            term.dcs_cmd = c;
            do_dcs();
            term.state = DCS_PASSTHROUGH;
          when '\e':
            term.state = DCS_ESCAPE;
          when '0' ... '9':  /* DCS parameter */
            term.state = DCS_PARAM;
          when ';':          /* DCS separator */
            term.state = DCS_PARAM;
          when ':':
            term.state = DCS_IGNORE;
          when '<' ... '?':
            term.dcs_cmd = c;
            term.state = DCS_PARAM;
          when ' ' ... '/':  /* DCS intermediate byte */
            term.dcs_cmd = c;
            term.state = DCS_INTERMEDIATE;
          otherwise:
            term.state = DCS_IGNORE;
        }

      when DCS_PARAM:
        switch (c) {
          when '@' ... '~':  /* DCS cmd final byte */
            term.dcs_cmd = term.dcs_cmd << 8 | c;
            do_dcs();
            term.state = DCS_PASSTHROUGH;
          when '\e':
            term.state = DCS_ESCAPE;
            term.esc_mod = 0;
          when '0' ... '9' or ';' or ':':  /* DCS parameter */
            term.state = DCS_PARAM;
          when '<' ... '?':
            term.dcs_cmd = term.dcs_cmd << 8 | c;
            term.state = DCS_PARAM;
          when ' ' ... '/':  /* DCS intermediate byte */
            term.dcs_cmd = term.dcs_cmd << 8 | c;
            term.state = DCS_INTERMEDIATE;
          otherwise:
            term.state = DCS_IGNORE;
        }

      when DCS_INTERMEDIATE:
        switch (c) {
          when '@' ... '~':  /* DCS cmd final byte */
            term.dcs_cmd = term.dcs_cmd << 8 | c;
            do_dcs();
            term.state = DCS_PASSTHROUGH;
          when '\e':
            term.state = DCS_ESCAPE;
            term.esc_mod = 0;
          when '0' ... '?':  /* DCS parameter byte */
            term.state = DCS_IGNORE;
          when ' ' ... '/':  /* DCS intermediate byte */
            term.dcs_cmd = term.dcs_cmd << 8 | c;
          otherwise:
            term.state = DCS_IGNORE;
        }

      when DCS_PASSTHROUGH:
        switch (c) {
          when '\e':
            term.state = DCS_ESCAPE;
            term.esc_mod = 0;
          otherwise:
            if (!term_push_cmd(c)) {
              do_dcs();
              term.cmd_buf[0] = c;
              term.cmd_len = 1;
            }
        }

      when DCS_IGNORE:
        switch (c) {
          when '\e':
            term.state = ESCAPE;
            term.esc_mod = 0;
        }

      when DCS_ESCAPE:
        if (c < 0x20) {
          do_ctrl(c);
          term.state = NORMAL;
        } else if (c < 0x30) {
          term.esc_mod = term.esc_mod ? 0xFF : c;
          term.state = ESCAPE;
        } else if (c == '\\') {
          /* Process DCS sequence if we see ST. */
          do_dcs();
          term.state = NORMAL;
        } else {
          term.state = ESCAPE;
          term.imgs.parser_state = NULL;
          do_esc(c);
        }
    }
  }

  if (term.ring_enabled && term.curs.y != oldy)
    term.ring_enabled = false;

  if (cfg.ligatures_support > 1) {
    // refresh ligature rendering in old cursor line
    term_invalidate(0, oldy, term.cols - 1, oldy);
  }

  // Update search match highlighting
  //term_schedule_search_partial_update();
  term_schedule_search_update();

  // Update screen
  win_schedule_update();

  // Print
  if (term.printing) {
    printer_write(term.printbuf, term.printbuf_pos);
    term.printbuf_pos = 0;
  }
}
Unknown