39 lines
787 B
C
39 lines
787 B
C
|
/* 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 unsigned char *s1 = (unsigned char*)str1;
|
||
|
|
register unsigned char *s2 = (unsigned char*)str2;
|
||
|
|
|
||
|
|
while (count-- > 0)
|
||
|
|
{
|
||
|
|
if (*s1++ != *s2++)
|
||
|
|
return s1[-1] < s2[-1] ? -1 : 1;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|