From 2ae1f1c9bb3943269e9419ef4a0dea31687ef61a Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Wed, 13 Mar 2019 21:06:54 -0400
Subject: migrate to gitlab

---
 chgrp.c | 108 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 chgrp.c

diff --git a/chgrp.c b/chgrp.c
new file mode 100644
index 0000000..f10a965
--- /dev/null
+++ b/chgrp.c
@@ -0,0 +1,108 @@
+/*
+ * UNG's Not GNU
+ *
+ * Copyright (c) 2011-2017, Jakob Kaivo <jkk@ung.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#define _XOPEN_SOURCE 700
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <grp.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#define FOLLOWCOMMANDLINE (1)
+#define FOLLOWRECURSIVE (2)
+#define NOFOLLOW (3)
+
+static int chgrp(gid_t gid, const char *path, int flag)
+{
+	(void)flag;
+	if (chown(path, (uid_t)-1, gid) == -1) {
+		fprintf(stderr, "chgrp: Couldn't change group of %s: %s\n", path, strerror(errno));
+		return 1;
+	}
+	return 0;
+}
+
+static gid_t strtogid(const char *s)
+{
+	struct group *grp = getgrnam(s);
+	if (grp == NULL) {
+		gid_t gid = (gid_t)atoi(s);
+		if (gid == 0 && strcmp(s, "0")) {
+			fprintf(stderr, "chgrp: Couldn't find group %s\n", s);
+			exit(1);
+		}
+		return gid;
+	}
+	return grp->gr_gid;
+}
+
+int main(int argc, char **argv)
+{
+	int c = 0, r = 0;
+	int changelink = 0;
+	int flag = 0;
+	int recursive = 0;
+
+	while ((c = getopt(argc, argv, "hHLPR")) != -1) {
+		switch (c) {
+		case 'h':
+			changelink = 1;
+			break;
+
+		case 'H':
+			flag = FOLLOWCOMMANDLINE;
+			break;
+
+		case 'L':
+			flag = FOLLOWRECURSIVE;
+			break;
+
+		case 'P':
+			flag = NOFOLLOW;
+			break;
+
+		case 'R':
+			recursive = 1;
+			break;
+
+		default:
+			return 1;
+		}
+	}
+
+	if (recursive && changelink) {
+		fprintf(stderr, "chgrp: Options -h and -R are mutually exclusive\n");
+		return 1;
+	}
+
+	if (optind >= argc - 1) {
+		fprintf(stderr, "chgrp: Group and at least one file are required\n");
+		return 1;
+	}
+
+	gid_t gid = strtogid(argv[optind++]);
+
+	while (optind < argc) { 
+		r |= chgrp(gid, argv[optind++], flag);
+	}
+
+	return r;
+}
-- 
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