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/* memcmp -- compare two memory regions.

   This function is in the public domain.  */

/*

NAME

        memcmp -- compare two memory regions

SYNOPSIS

        int memcmp (const void *from, const void *to, size_t count)

DESCRIPTION

        Compare two memory regions and return less than,

        equal to, or greater than zero, according to lexicographical

        ordering of the compared regions.

*/

#include <ansidecl.h>

#ifdef __STDC__

#include <stddef.h>

#else

#define size_t unsigned long

#endif

int

DEFUN(memcmp, (str1, str2, count),

      const PTR str1 AND const PTR str2 AND size_t count)

{

  register const unsigned char *s1 = (const unsigned char*)str1;

  register const unsigned char *s2 = (const unsigned char*)str2;

  while (count-- > 0)

    {

      if (*s1++ != *s2++)

          return s1[-1] < s2[-1] ? -1 : 1;

    }

  return 0;

}