- single KERNEL_VERSION(a,b,c) macro in platform.h

[oweals/busybox.git] / coreutils / ln.c

diff --git a/coreutils/ln.c b/coreutils/ln.c
index 3e87b579e7e9a0a4fa15ef1d3624aa06fd18f6a4..229c682185ef029a0bb80deeacc05b30c23d453e 100644 (file)
--- a/coreutils/ln.c
+++ b/coreutils/ln.c
@@ -1,52 +1,118 @@
-#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;
 }