strlen(3) strnlen(3)

cstdlib/string.c

@@ -0,0 +1,17 @@
+size_t
+strlen(const char *s){
+	size_t r;
+
+	for(r = 0; s[r] != '\0'; ++r);
+
+	return r;
+}
+
+size_t
+strnlen(const char *s, size_t maxlen){
+	size_t r;
+
+	for(r = 0; s[r] != '\0' && r < maxlen; ++r);
+
+	return r;
+}

cstdlib/string.h

@@ -0,0 +1,5 @@
+#ifndef _STRING_H
+#	define _STRING_H
+size_t strlen(const char *s);
+size_t strnlen(const char *s, size_t maxlen);
+#endif /* ifndef _STRING_H */