1 files changed, 70 insertions, 0 deletions
diff --git a/toys/posix/ln.c b/toys/posix/ln.c
new file mode 100644
index 00000000..6f55971a
--- /dev/null
+++ b/toys/posix/ln.c
@@ -0,0 +1,70 @@
+/* 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, "<1nfs", TOYFLAG_BIN))
+
+config LN
+	bool "ln"
+	default y
+	help
+	  usage: ln [-sf] [FROM...] TO
+
+	  Create a link between FROM and TO.
+	  With only one argument, create link in current directory.
+
+	  -s	Create a symbolic link
+	  -f	Force the creation of the link, even if TO already exists
+          -n	Symlink at destination treated as file
+*/
+
+#include "toys.h"
+
+#define FLAG_s	1
+#define FLAG_f	2
+#define FLAG_n	4
+
+void ln_main(void)
+{
+    char *dest = toys.optargs[--toys.optc], *new;
+    struct stat buf;
+    int i;
+
+    // With one argument, create link in current directory.
+    if (!toys.optc) {
+        toys.optc++;
+        dest=".";
+    }
+
+    // Is destination a directory?
+    if (((toys.optflags&FLAG_n) ? lstat : stat)(dest, &buf)
+        || !S_ISDIR(buf.st_mode))
+    {
+        if (toys.optc>1) error_exit("'%s' not a directory");
+        buf.st_mode = 0;
+    }
+
+    for (i=0; i<toys.optc; i++) {
+        int rc;
+        char *try = toys.optargs[i];
+
+        if (S_ISDIR(buf.st_mode)) {
+            new = strrchr(try, '/');
+            if (!new) new = try;
+            new = xmsprintf("%s/%s", dest, new);
+        } else new = dest;
+        /* Silently unlink the existing target. If it doesn't exist,
+         * then we just move on */
+        if (toys.optflags & FLAG_f) unlink(new);
+
+        rc = (toys.optflags & FLAG_s) ? symlink(try, new) : link(try, new);
+        if (rc)
+            perror_exit("cannot create %s link from '%s' to '%s'",
+                (toys.optflags & FLAG_s) ? "symbolic" : "hard", try, new);
+        if (new != dest) free(new);
+    }
+}