+/* vi: set sw=4 ts=4: */
/*
* Mini ln implementation for busybox
*
- * Copyright (C) 1998 by Erik Andersen <andersee@debian.org>
+ * 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
*
*/
-#include "internal.h"
+/* 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 <dirent.h>
+#include <stdlib.h>
+#include <unistd.h>
#include <errno.h>
+#include "busybox.h"
+#define LN_SYMLINK 1
+#define LN_FORCE 2
+#define LN_NODEREFERENCE 4
+#define LN_BACKUP 8
+#define LN_SUFFIX 16
-static 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_main(int argc, char **argv)
+{
+ 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 *);
+ flag = bb_getopt_ulflags(argc, argv, "sfnbS:", &suffix);
-static int symlinkFlag = FALSE;
-static int removeoldFlag = FALSE;
-static const char *destName;
+ if (argc == optind) {
+ bb_show_usage();
+ }
+ last = argv[argc - 1];
+ argv += optind;
-extern int ln_main(int argc, char **argv)
-{
- int status;
- char newdestName[NAME_MAX];
-
- if (argc < 3) {
- fprintf(stderr, "Usage: %s", ln_usage);
- exit (FALSE);
- }
- argc--;
- argv++;
-
- /* Parse any options */
- while (**argv == '-') {
- while (*++(*argv))
- switch (**argv) {
- case 's':
- symlinkFlag = TRUE;
- break;
- case 'f':
- removeoldFlag = TRUE;
- break;
- default:
- fprintf(stderr, "Usage: %s\n", ln_usage);
- exit(FALSE);
- }
- argc--;
- argv++;
- }
-
-
- destName = argv[argc - 1];
-
- if ((argc > 3) && !(isDirectory(destName))) {
- fprintf(stderr, "%s: not a directory\n", destName);
- exit (FALSE);
- }
-
- while (argc-- >= 2) {
- strcpy(newdestName, destName);
- strcat(newdestName, (*argv)+(strlen(*(++argv))));
-
- if (removeoldFlag==TRUE ) {
- status = ( unlink(newdestName) && errno != ENOENT );
- if ( status != 0 ) {
- perror(newdestName);
- exit( FALSE);
- }
+ if (argc == optind + 1) {
+ *--argv = last;
+ last = bb_get_last_path_component(bb_xstrdup(last));
}
- if ( symlinkFlag==TRUE)
- status = symlink(*argv, newdestName);
- else
- status = link(*argv, newdestName);
- if ( status != 0 ) {
- perror(newdestName);
- exit( FALSE);
- }
- }
- exit( TRUE);
+
+ 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;
}