ref: c946d13235a8460a8c7f2aa86e705202d77231a7
dir: /src/libc/string/memchr.c/
#include <string.h> #undef memchr void * memchr(const void *s, int c, size_t n) { const unsigned char *bp = s; while (n > 0 && *bp++ != c) --n; return (n == 0) ? NULL : bp-1; }