ref: 4c09eaec1c1f81e175b6e8b6266e8a2c9aa7afaa dir: /lib/c/strchr.c/
#include <string.h> #undef strchr char * strchr(const char *s, int c) { while (*s && *s != c) ++s; return (*s == c) ? (char *)s : NULL; }