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+/* 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);
+ }
+}