I could trace strcmp(1) as far back as
<293436c5ad/src/streq.c>
in my repo.

@@ -21,1 +33,3 @@
-				return -1; /* actually 255 */
+	for (; *argv[1] != '\0'; ++argv[1]) { /* iterate chars in ref */
+		/* iterate argc */
+		for (size_t i = 2 /* ref cmp */; i < argc; ++argv[i], ++i) {

@@ -22,2 +39,4 @@
+		}
+	}
 
 	return 0;