[Toybox] [PATCH 4/5] Add new toy - chgrp.

[Georgi Chorbadzhiyski]

---
 toys/chgrp.c |   72 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 72 insertions(+), 0 deletions(-)
 create mode 100644 toys/chgrp.c

diff --git a/toys/chgrp.c b/toys/chgrp.c
new file mode 100644
index 0000000..8388ce6
--- /dev/null
+++ b/toys/chgrp.c
@@ -0,0 +1,72 @@
+/* vi: set sw=4 ts=4:
+ *
+ * chgrp.c - Change group ownership
+ *
+ * Copyright 2012 Georgi Chorbadzhiyski <georgi at unixsol.org>
+ *
+ * See http://pubs.opengroup.org/onlinepubs/009695399/utilities/chgrp.html
+ *
+ * TODO: Add support for -h
+ * TODO: Add support for -H
+ * TODO: Add support for -L
+ * TODO: Add support for -P
+
+USE_CHGRP(NEWTOY(chgrp, "<2Rfv", TOYFLAG_BIN))
+
+config CHGRP
+	bool "chgrp"
+	default y
+	help
+	  usage: chgrp [-R] [-f] [-v] group file...
+	  Change group ownership of one or more files.
+
+	  -R	recurse into subdirectories.
+	  -f	suppress most error messages.
+	  -v	verbose output.
+*/
+
+#include "toys.h"
+
+#define FLAG_R 4
+#define FLAG_f 2
+#define FLAG_v 1
+
+DEFINE_GLOBALS(
+	gid_t group;
+	char *group_name;
+)
+
+#define TT this.chgrp
+
+static int do_chgrp(char *path) {
+	int ret = chown(path, -1, TT.group);
+	if (toys.optflags & FLAG_v)
+		xprintf("chgrp(%s, %s)\n", TT.group_name, path);
+	if (ret == -1 && !(toys.optflags & FLAG_f))
+		perror_msg("changing group of '%s' to '%s'", path, TT.group_name);
+	toys.exitval |= ret;
+	return ret;
+}
+
+void chgrp_main(void)
+{
+	char **s;
+	struct group *group;
+
+	TT.group_name = *toys.optargs;
+	group = getgrnam(TT.group_name);
+	if (!group) {
+		error_msg("invalid group '%s'", TT.group_name);
+		toys.exitval = 1;
+		return;
+	}
+	TT.group = group->gr_gid;
+
+	for (s=toys.optargs + 1; *s; s++) {
+		if (toys.optflags & FLAG_R) {
+			dirtree_for_each(*s, do_chgrp);
+		} else {
+			do_chgrp(*s);
+		}
+	}
+}
-- 
1.7.5.1