print_string(char *s, ssize_t len, int dl, const uint8_t *data)
{
 uint8_t c;
 const uint8_t *e, *p;
 ssize_t bytes = 0;
 ssize_t r;

	e = data + dl;
 while (data < e) {
		c = *data++;
 if (c == '\0') {
 /* If rest is all NULL, skip it. */
 for (p = data; p < e; p++)
 if (*p != '\0')
 break;
 if (p == e)
 break;
 }
 if (!isascii(c) || !isprint(c)) {
 if (s) {
 if (len < 5) {
					errno = ENOBUFS;
 return -1;
 }
				r = snprintf(s, len, "\\%03o", c);
				len -= r;
				bytes += r;
				s += r;
 } else
				bytes += 4;
 continue;
 }
 switch (c) {
 case '"': /* FALLTHROUGH */
 case '\'': /* FALLTHROUGH */
 case '$': /* FALLTHROUGH */
 case '`': /* FALLTHROUGH */
 case '\\': /* FALLTHROUGH */
 case '|': /* FALLTHROUGH */
 case '&':
 if (s) {
 if (len < 3) {
					errno = ENOBUFS;
 return -1;
 }
 *s++ = '\\';
				len--;
 }
			bytes++;
 break;
 }
 if (s) {
 *s++ = c;
			len--;
 }
		bytes++;
 }

 /* NULL */
 if (s)
 *s = '\0';
	bytes++;
 return bytes;
}

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.