memcmp.c

/* public domain rewrite of memcmp(3) */
 
#include "ruby/missing.h"
#include <stddef.h>
 
int
memcmp(const void *s1, const void *s2, size_t len)
{
    register unsigned char *a = (unsigned char*)s1;
    register unsigned char *b = (unsigned char*)s2;
    register int tmp;
 
    for (; len; --len) {
        tmp = *a++ - *b++;
        if (tmp)
            return tmp;
    }
    return 0;
}