memrchr.c

#define SYSCLIB_DISABLE_BUILTINS
#include <sysclib.h>
 
void *__memrchr(const void *m, int c, size_t n)
{
    const unsigned char *s = m;
    c = (unsigned char)c;
    while (n--) if (s[n]==c) return (void *)(s+n);
    return 0;
}