-#include "internal.h"
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini ln implementation for busybox
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+/* BB_AUDIT SUSv3 compliant */
+/* BB_AUDIT GNU options missing: -d, -F, -i, and -v. */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/ln.html */
+
#include <stdio.h>
-#include <sys/stat.h>
-#include <sys/param.h>
+#include <stdlib.h>
+#include <unistd.h>
#include <errno.h>
+#include "busybox.h"
-const char ln_usage[] = "ln [-s] [-f] original-name additional-name\n"
-"\n"
-"\tAdd a new name that refers to the same file as \"original-name\"\n"
-"\n"
-"\t-s:\tUse a \"symbolic\" link, instead of a \"hard\" link.\n"
-"\t-f:\tRemove existing destination files.\n";
+#define LN_SYMLINK 1
+#define LN_FORCE 2
+#define LN_NODEREFERENCE 4
+#define LN_BACKUP 8
+#define LN_SUFFIX 16
-int
-ln_fn(const struct FileInfo * i)
+int ln_main(int argc, char **argv)
{
- int status = 0;
- char d[PATH_MAX];
- const char * destination = i->destination;
+ int status = EXIT_SUCCESS;
+ int flag;
+ char *last;
+ char *src_name;
+ char *src;
+ char *suffix = "~";
+ struct stat statbuf;
+ int (*link_func)(const char *, const char *);
- if ( !i->makeSymbolicLink && (i->stat.st_mode & S_IFMT) == S_IFDIR ) {
- fprintf(stderr, "Please use \"ln -s\" to link directories.\n");
- return 1;
- }
+ flag = bb_getopt_ulflags(argc, argv, "sfnbS:", &suffix);
- /*
- * If the destination is a directory, create a file within it.
- */
- if ( is_a_directory(i->destination) ) {
- destination = join_paths(
- d
- ,i->destination
- ,&i->source[i->directoryLength]);
+ if (argc == optind) {
+ bb_show_usage();
}
- if ( i->force )
- status = ( unlink(destination) && errno != ENOENT );
+ last = argv[argc - 1];
+ argv += optind;
- if ( status == 0 ) {
- if ( i->makeSymbolicLink )
- status = symlink(i->source, destination);
- else
- status = link(i->source, destination);
+ if (argc == optind + 1) {
+ *--argv = last;
+ last = bb_get_last_path_component(bb_xstrdup(last));
}
- if ( status != 0 ) {
- name_and_error(destination);
- return 1;
- }
- else
- return 0;
+ do {
+ src_name = NULL;
+ src = last;
+
+ if (is_directory(src,
+ (flag & LN_NODEREFERENCE) ^ LN_NODEREFERENCE,
+ NULL)) {
+ src_name = bb_xstrdup(*argv);
+ src = concat_path_file(src, bb_get_last_path_component(src_name));
+ free(src_name);
+ src_name = src;
+ }
+ if (!(flag & LN_SYMLINK) && stat(*argv, &statbuf)) {
+ bb_perror_msg("%s", *argv);
+ status = EXIT_FAILURE;
+ free(src_name);
+ continue;
+ }
+
+ if (flag & LN_BACKUP) {
+ char *backup;
+ backup = bb_xasprintf("%s%s", src, suffix);
+ if (rename(src, backup) < 0 && errno != ENOENT) {
+ bb_perror_msg("%s", src);
+ status = EXIT_FAILURE;
+ free(backup);
+ continue;
+ }
+ free(backup);
+ /*
+ * When the source and dest are both hard links to the same
+ * inode, a rename may succeed even though nothing happened.
+ * Therefore, always unlink().
+ */
+ unlink(src);
+ } else if (flag & LN_FORCE) {
+ unlink(src);
+ }
+
+ link_func = link;
+ if (flag & LN_SYMLINK) {
+ link_func = symlink;
+ }
+
+ if (link_func(*argv, src) != 0) {
+ bb_perror_msg("%s", src);
+ status = EXIT_FAILURE;
+ }
+
+ free(src_name);
+
+ } while ((++argv)[1]);
+
+ return status;
}