ref: 33b631df0ef7ee8d4a9e822bdfec5faa8777bfe7
dir: /lib/c/src/memchr.c/
#include <string.h> #undef memchr void * memchr(const void *s, int c, size_t n) { unsigned char *bp = (char *) s; while (n > 0 && *bp++ != c) --n; return (n == 0) ? NULL : bp-1; }