diff options
Diffstat (limited to 'release/src/router/busybox/coreutils/ln.c')
| -rw-r--r-- | release/src/router/busybox/coreutils/ln.c | 100 |
1 files changed, 52 insertions, 48 deletions
diff --git a/release/src/router/busybox/coreutils/ln.c b/release/src/router/busybox/coreutils/ln.c index 5217634f..eb717195 100644 --- a/release/src/router/busybox/coreutils/ln.c +++ b/release/src/router/busybox/coreutils/ln.c @@ -2,51 +2,39 @@ /* * Mini ln implementation for busybox * - * Copyright (C) 1999-2003 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 + * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> * + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ /* BB_AUDIT SUSv3 compliant */ -/* BB_AUDIT GNU options missing: -b, -d, -F, -i, -S, and -v. */ +/* BB_AUDIT GNU options missing: -d, -F, -i, and -v. */ /* http://www.opengroup.org/onlinepubs/007904975/utilities/ln.html */ -/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org) - * - * Fixed bug involving -n option. Essentially, -n was always in effect. - */ +#include "libbb.h" + +/* This is a NOEXEC applet. Be very careful! */ -#include <stdlib.h> -#include <unistd.h> -#include "busybox.h" #define LN_SYMLINK 1 #define LN_FORCE 2 #define LN_NODEREFERENCE 4 +#define LN_BACKUP 8 +#define LN_SUFFIX 16 -extern int ln_main(int argc, char **argv) +int ln_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int ln_main(int argc, char **argv) { int status = EXIT_SUCCESS; int flag; char *last; char *src_name; - const char *src; + char *src; + char *suffix = (char*)"~"; + struct stat statbuf; int (*link_func)(const char *, const char *); - flag = bb_getopt_ulflags(argc, argv, "sfn"); + flag = getopt32(argv, "sfnbS:", &suffix); if (argc == optind) { bb_show_usage(); @@ -57,23 +45,49 @@ extern int ln_main(int argc, char **argv) if (argc == optind + 1) { *--argv = last; - last = bb_get_last_path_component(bb_xstrdup(last)); + last = bb_get_last_path_component_strip(xstrdup(last)); } do { - src_name = 0; + 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)); + (flag & 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 = (char *)src; + src_name = src; + } + if (!(flag & 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 (flag & LN_FORCE) { + if (flag & 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 (flag & LN_FORCE) { unlink(src); } @@ -81,25 +95,15 @@ extern int ln_main(int argc, char **argv) if (flag & LN_SYMLINK) { link_func = symlink; } - + if (link_func(*argv, src) != 0) { - bb_perror_msg(src); - status = EXIT_FAILURE;; + bb_simple_perror_msg(src); + status = EXIT_FAILURE; } free(src_name); - + } while ((++argv)[1]); return status; } - - - - - - - - - - |