C Programming - String Length!!

glibc implementation of strlen for i386 platform.

Cool!

size_t
strlen (const char *str)
{
  int cnt;

  asm("cld\n"   /* Search forward.  */
      /* Some old versions of gas need `repne' instead of `repnz'.  */
      "repnz\n"   /* Look for a zero byte.  */
      "scasb" /* %0, %1, %3 */ :
      "=c" (cnt) : "D" (str), "0" (-1), "a" (0));

  return -2 - cnt;
}

Note: This was extracted from glibc-2.3.6 (sysdeps/i386/strlen.c)

Labels: C