ref: cdc06f177f6e2b9f4a4e354ac10dabfae0fd459a dir: /libnpe/strnlen.c/
#include <string.h> size_t strnlen(char *s, size_t maxlen) { size_t i; for (i = 0; i < maxlen && s[i] != '\0'; i++) ; return i; }