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

SYNOPSIS
	#include <string.h>
	int strcmp(const char *<[a]>, const 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 "local.h"

int
strcmp (const char *s1,
	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_X_Y(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 (DETECT_NULL(*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 */
}
