-#include "internal.h"
-#include <stdio.h>
-#include <sys/stat.h>
-#include <sys/param.h>
-#include <errno.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";
-
-int
-ln_fn(const struct FileInfo * i)
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini ln implementation for busybox
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+/* BB_AUDIT SUSv3 compliant */
+/* BB_AUDIT GNU options missing: -d, -F, -i, and -v. */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/ln.html */
+
+#include "libbb.h"
+
+/* This is a NOEXEC applet. Be very careful! */
+
+
+#define LN_SYMLINK 1
+#define LN_FORCE 2
+#define LN_NODEREFERENCE 4
+#define LN_BACKUP 8
+#define LN_SUFFIX 16
+
+int ln_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int ln_main(int argc, char **argv)
{
- int status = 0;
- char d[PATH_MAX];
- const char * destination = i->destination;
+ int status = EXIT_SUCCESS;
+ int opts;
+ char *last;
+ char *src_name;
+ char *src;
+ char *suffix = (char*)"~";
+ 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;
- }
+ opt_complementary = "-1"; /* min one arg */
+ opts = getopt32(argv, "sfnbS:", &suffix);
+
+ last = argv[argc - 1];
+ argv += optind;
- /*
- * 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 + 1) {
+ *--argv = last;
+ last = bb_get_last_path_component_strip(xstrdup(last));
}
- if ( i->force )
- status = ( unlink(destination) && errno != ENOENT );
+ do {
+ src_name = NULL;
+ src = last;
- if ( status == 0 ) {
- if ( i->makeSymbolicLink )
- status = symlink(i->source, destination);
- else
- status = link(i->source, destination);
- }
+ if (is_directory(src,
+ (opts & LN_NODEREFERENCE) ^ LN_NODEREFERENCE,
+ NULL)
+ ) {
+ src_name = xstrdup(*argv);
+ src = concat_path_file(src, bb_get_last_path_component_strip(src_name));
+ free(src_name);
+ src_name = src;
+ }
+ if (!(opts & LN_SYMLINK) && stat(*argv, &statbuf)) {
+ // coreutils: "ln dangling_symlink new_hardlink" works
+ if (lstat(*argv, &statbuf) || !S_ISLNK(statbuf.st_mode)) {
+ bb_simple_perror_msg(*argv);
+ status = EXIT_FAILURE;
+ free(src_name);
+ continue;
+ }
+ }
- if ( status != 0 ) {
- name_and_error(destination);
- return 1;
- }
- else
- return 0;
+ if (opts & LN_BACKUP) {
+ char *backup;
+ backup = xasprintf("%s%s", src, suffix);
+ if (rename(src, backup) < 0 && errno != ENOENT) {
+ bb_simple_perror_msg(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 (opts & LN_FORCE) {
+ unlink(src);
+ }
+
+ link_func = link;
+ if (opts & LN_SYMLINK) {
+ link_func = symlink;
+ }
+
+ if (link_func(*argv, src) != 0) {
+ bb_simple_perror_msg(src);
+ status = EXIT_FAILURE;
+ }
+
+ free(src_name);
+
+ } while ((++argv)[1]);
+
+ return status;
}