[PATCH] Add coreutils/unlink.c

[Isaac Dunham]

Here's an implementation of the "unlink" command.
Adds 252 bytes when enabled; a fair part is the error messages and text.
If you would rather shrink those, I don't object.

I wrote this because (a) it's POSIX and (b) I occasionally use unlink,
and I saw a patch in the alpine aports tree converting unlink to rm.

HTH,
Isaac Dunham
-------------- next part --------------
>From 135628b220c32741dc86ccef8f0dfb13eaaee206 Mon Sep 17 00:00:00 2001
From: Isaac Dunham <ibid.ag at gmail.com>
Date: Sat, 21 Jun 2014 20:47:05 +0000
Subject: [PATCH] Add POSIX unlink command.

Change in size when enabled:
function                                             old     new   delta
unlink_main                                            -     118    +118
.rodata                                           135671  135760     +89
packed_usage                                       29477   29509     +32
applet_names                                        2436    2443      +7
applet_main                                         1420    1424      +4
applet_nameofs                                       710     712      +2
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 5/0 up/down: 252/0)             Total: 252 bytes

Not important but nice.
---
 coreutils/unlink.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 coreutils/unlink.c

diff --git a/coreutils/unlink.c b/coreutils/unlink.c
new file mode 100644
index 0000000..5a76ba9
--- /dev/null
+++ b/coreutils/unlink.c
@@ -0,0 +1,36 @@
+/* vi: set sw=4 ts=4: */
+/* unlink for busybox
+ *
+ * Copyright (C) 2014 Isaac Dunham <ibid.ag at gmail.com>
+ *
+ * Licensed under GPLv2, see LICENSE in this source tree
+ */
+
+//kbuild:lib-$(CONFIG_UNLINK)	+= unlink.o
+
+//config:config UNLINK
+//config:	bool "unlink"
+//config:	default n
+//config:	help
+//config:	  unlink deletes a file by calling unlink()
+
+//applet:IF_UNLINK( APPLET( unlink, BB_DIR_USR_BIN, BB_SUID_DROP))
+
+//usage:#define unlink_trivial_usage 
+//usage:	"FILE"
+//usage:#define unlink_full_usage "\n\n"
+//usage:	"delete FILE by calling unlink()"
+
+#include "libbb.h"
+
+int unlink_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int unlink_main(int argc, char **argv)
+{
+	if (argc < 2)
+		bb_perror_msg_and_die("no file specified");
+	if (argc > 2)
+		bb_perror_msg_and_die("extra files");
+	if (unlink(argv[1]))
+		bb_perror_msg_and_die("can't delete '%s'", argv[0]);
+	else return 0;
+}
-- 
2.0.0