rockbox/firmware/libc/strcmp.c

/*
FUNCTION
        <<strcmp>>---character string compare
        
INDEX
        strcmp

ANSI_SYNOPSIS
        #include <string.h>
        int strcmp(const char *<[a]>, const char *<[b]>);

TRAD_SYNOPSIS
        #include <string.h>
        int strcmp(<[a]>, <[b]>)
        char *<[a]>;
        char *<[b]>;

DESCRIPTION
        <<strcmp>> compares the string at <[a]> to
        the string at <[b]>.

RETURNS
        If <<*<[a]>>> sorts lexicographically after <<*<[b]>>>,
        <<strcmp>> returns a number greater than zero.  If the two
        strings match, <<strcmp>> returns zero.  If <<*<[a]>>>
        sorts lexicographically before <<*<[b]>>>, <<strcmp>> returns a
        number less than zero.

PORTABILITY
<<strcmp>> is ANSI C.

<<strcmp>> requires no supporting OS subroutines.

QUICKREF
        strcmp ansi pure
*/

#include <string.h>
#include <limits.h>
#include "_ansi.h" /* for _DEFUN */

/* Nonzero if either X or Y is not aligned on a "long" boundary.  */
#define UNALIGNED(X, Y) \
  (((long)X & (sizeof (long) - 1)) | ((long)Y & (sizeof (long) - 1)))

/* DETECTNULL returns nonzero if (long)X contains a NULL byte. */
#if LONG_MAX == 2147483647L
#define DETECTNULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080)
#else
#if LONG_MAX == 9223372036854775807L
#define DETECTNULL(X) (((X) - 0x0101010101010101) & ~(X) & 0x8080808080808080)
#else
#error long int is not a 32bit or 64bit type.
#endif
#endif

#ifndef DETECTNULL
#error long int is not a 32bit or 64bit byte
#endif

int
_DEFUN (strcmp, (s1, s2),
        _CONST char *s1 _AND
        _CONST char *s2)
{ 
#if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__)
  while (*s1 != '\0' && *s1 == *s2)
    {
      s1++;
      s2++;
    }

  return (*(unsigned char *) s1) - (*(unsigned char *) s2);
#else
  unsigned long *a1;
  unsigned long *a2;

  /* If s1 or s2 are unaligned, then compare bytes. */
  if (!UNALIGNED (s1, s2))
    {  
      /* If s1 and s2 are word-aligned, compare them a word at a time. */
      a1 = (unsigned long*)s1;
      a2 = (unsigned long*)s2;
      while (*a1 == *a2)
        {
          /* To get here, *a1 == *a2, thus if we find a null in *a1,
             then the strings must be equal, so return zero.  */
          if (DETECTNULL (*a1))
            return 0;

          a1++;
          a2++;
        }

      /* A difference was detected in last few bytes of s1, so search bytewise */
      s1 = (char*)a1;
      s2 = (char*)a2;
    }

  while (*s1 != '\0' && *s1 == *s2)
    {
      s1++;
      s2++;
    }
  return (*(unsigned char *) s1) - (*(unsigned char *) s2);
#endif /* not PREFER_SIZE_OVER_SPEED */
}