1 files changed, 99 insertions, 0 deletions
diff --git a/chmod.c b/chmod.c
new file mode 100644
index 0000000..9dcadaf
--- /dev/null
+++ b/chmod.c
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Copyright (C) 2022, 2023 Ferass El Hafidi <vitali64pmemail@protonmail.com>
+ */
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#define REQ_PRINT_USAGE /* Require print_usage() from common.h */
+#define REQ_ERRPRINT /* Require errprint() from common.h */
+#define DESCRIPTION "Change file modes."
+#define OPERANDS    "mode file"
+#include "common.h"
+
+#ifdef FASESBOX
+int chmod_main(int argc, char *argv[]) {
+#else
+int main(int argc, char *argv[]) {
+#endif
+	int argument, i = 0;
+	mode_t owner_modes, group_modes, other_modes;
+	char *argv0 = strdup(argv[0]);
+	if (argc == 1) {
+		print_usage(argv[0], DESCRIPTION, OPERANDS, VERSION);
+		return 1;
+	}
+	while ((argument = getopt(argc, argv, "")) != -1) {
+		if (argument == '?') {
+			print_usage(argv[0], DESCRIPTION, OPERANDS, VERSION);
+			return 1;
+		}
+	} argc -= optind; argv += optind;
+	/* I know there's a better way of doing it, please let me know if you 
+	 * know a better way of doing it 
+	 */
+	if (argv[0][i] == '0') i++;
+	switch (argv[0][i]) {
+		/* Owner modes */
+		case '7':
+			owner_modes = S_IRWXU;
+			break;
+		case '4':
+			owner_modes = S_IRUSR;
+			break;
+		case '2':
+			owner_modes = S_IWUSR;
+			break;
+		case '1':
+			owner_modes = S_IXUSR;
+			break;
+		default:
+			print_usage(argv0, DESCRIPTION, OPERANDS, VERSION);
+			return 1;
+	}
+	i++;
+	switch (argv[0][i]) {
+		/* Group modes */
+		case '7':
+			group_modes = S_IRWXG;
+			break;
+		case '4':
+			group_modes = S_IRGRP;
+			break;
+		case '2':
+			group_modes = S_IWGRP;
+			break;
+		case '1':
+			group_modes = S_IXGRP;
+			break;
+		default:
+			print_usage(argv0, DESCRIPTION, OPERANDS, VERSION);
+			return 1;
+	}
+	i++;
+	switch (argv[0][i]) {
+		/* Other modes */
+		case '7':
+			other_modes = S_IRWXO;
+			break;
+		case '4':
+			other_modes = S_IROTH;
+			break;
+		case '2':
+			other_modes = S_IWOTH;
+			break;
+		case '1':
+			other_modes = S_IXOTH;
+			break;
+		default:
+			print_usage(argv0, DESCRIPTION, OPERANDS, VERSION);
+			return 1;
+	}
+
+	chmod(argv[1], owner_modes | group_modes | other_modes);
+	return errprint(argv[0], "chmod()", errno);
+}