ref: 071923624122ae0088073ca68a8dfc65c14c0c7d
dir: /lib/c/memchr.c/
#include <string.h> #undef memchr void * memchr(const void *s, int c, size_t n) { unsigned char *bp = (unsigned char *) s; while (n > 0 && *bp++ != c) --n; return (n == 0) ? NULL : bp-1; }