Add ln from Andre Renaud.

1 files changed, 48 insertions, 0 deletions

diff --git a/toys/ln.c b/toys/ln.c
new file mode 100644
index 00000000..9dd413f5
--- /dev/null
+++ b/toys/ln.c
@@ -0,0 +1,48 @@
+/* vi: set sw=4 ts=4:
+ *
+ * ln.c - Create filesystem links
+ *
+ * Copyright 2012 Andre Renaud <andre@bluewatersys.com>
+ *
+ * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ln.html
+
+USE_LN(NEWTOY(ln, "fs", TOYFLAG_BIN))
+
+config LN
+	bool "ln"
+	default n
+	help
+	  usage: ln [-s] [-f] file1 file2
+
+          Create a link from file2 to file1
+
+          -s    Create a symbolic link
+          -f    Force the creation of the link, even if file2 already exists
+*/
+
+#include "toys.h"
+
+#define FLAG_s	1
+#define FLAG_f  2
+
+void ln_main(void)
+{
+    char *file1 = toys.optargs[0], *file2 = toys.optargs[1];
+
+    /* FIXME: How do we print out the usage info? */
+    if (!file1 || !file2)
+        perror_exit("Usage: ln [-s] [-f] file1 file2");
+    /* Silently unlink the existing target. If it doesn't exist,
+     * then we just move on */
+    if (toys.optflags & FLAG_f)
+        unlink(file2);
+    if (toys.optflags & FLAG_s) {
+        if (symlink(file1, file2))
+            perror_exit("cannot create symbolic link from %s to %s",
+                    file1, file2);
+    } else {
+        if (link(file1, file2))
+            perror_exit("cannot create hard link from %s to %s",
+                    file1, file2);
+    }
+}