diff --git a/src/strcmp.c b/src/strcmp.c
index 33b73c2..2872788 100644
--- a/src/strcmp.c
+++ b/src/strcmp.c
@@ -1,24 +1,49 @@
+/*
+ * Copyright (c) 2023 DTB <trinity@trinity.moe>
+ * Copyright (c) 2023–2024 Emma Tebibyte <emma@tebibyte.media>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ *
+ * This program is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU Affero General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see https://www.gnu.org/licenses/.
+ */
+
 #include <stdio.h> /* fprintf(3), stderr */
-#include <stdlib.h> /* EXIT_FAILURE */
 #include <sysexits.h>
 
 static char *program_name = "strcmp";
 
-int main(int argc, char *argv[]){
+int main(int argc, char *argv[]) {
 	int i;
 
-	if(argc < 3){
-		fprintf(stderr, "Usage: %s string string...\n",
-			argv[0] == NULL ? program_name : argv[0]);
+	if (argc < 3) {
+		fprintf(
+			stderr,
+			"Usage: %s string string...\n",
+			argv[0] == NULL ? program_name : argv[0]
+		);
+
 		return EX_USAGE;
 	}
 
-	for(; *argv[1] != '\0'; ++argv[1])
-		for(i = 2; i < argc; ++i)
-			if(*argv[i-1] > *argv[i])
+	for (; *argv[1] != '\0'; ++argv[1]) {
+		for(i = 2; i < argc; ++i) {
+			if (*argv[i-1] > *argv[i]) {
 				return 1;
-			else if(*argv[i-1] < *argv[i]++)
-				return -1; /* actually 255 */
+			} else if (*argv[i-1] < *argv[i]++) {
+				return 255;
+			}
+		}
+	}
 
-	return 0;
+	return EX_OK;
 }