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131 lines
3.0 KiB
C
131 lines
3.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini ln implementation for busybox
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*
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*
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* Copyright (C) 1999 by Lineo, inc.
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* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "internal.h"
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#define BB_DECLARE_EXTERN
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#define bb_need_name_too_long
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#define bb_need_not_a_directory
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#include "messages.c"
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#include <stdio.h>
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#include <dirent.h>
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#include <errno.h>
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#include <sys/param.h> /* for PATH_MAX */
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static const char ln_usage[] =
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"ln [OPTION] TARGET... LINK_NAME|DIRECTORY\n\n"
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"Create a link named LINK_NAME or DIRECTORY to the specified TARGET\n\n"
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"Options:\n"
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"\t-s\tmake symbolic links instead of hard links\n"
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"\t-f\tremove existing destination files\n"
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"\t-n\tno dereference symlinks - treat like normal file\n";
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static int symlinkFlag = FALSE;
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static int removeoldFlag = FALSE;
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static int followLinks = TRUE;
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extern int ln_main(int argc, char **argv)
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{
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char *linkName;
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int linkIntoDirFlag;
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if (argc < 3) {
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usage(ln_usage);
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}
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argc--;
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argv++;
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/* Parse any options */
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while (**argv == '-') {
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while (*++(*argv))
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switch (**argv) {
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case 's':
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symlinkFlag = TRUE;
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break;
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case 'f':
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removeoldFlag = TRUE;
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break;
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case 'n':
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followLinks = FALSE;
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break;
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default:
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usage(ln_usage);
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}
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argc--;
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argv++;
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}
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linkName = argv[argc - 1];
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if (strlen(linkName) > PATH_MAX) {
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fprintf(stderr, name_too_long, "ln");
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exit FALSE;
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}
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linkIntoDirFlag = isDirectory(linkName, TRUE, NULL);
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if ((argc > 3) && !linkIntoDirFlag) {
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fprintf(stderr, not_a_directory, "ln", linkName);
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exit FALSE;
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}
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while (argc-- >= 2) {
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char srcName[PATH_MAX + 1];
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int nChars, status;
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if (strlen(*argv) > PATH_MAX) {
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fprintf(stderr, name_too_long, "ln");
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exit FALSE;
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}
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if (followLinks == FALSE) {
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strcpy(srcName, *argv);
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} else {
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/* Warning! This can silently truncate if > PATH_MAX, but
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I don't think that there can be one > PATH_MAX anyway. */
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nChars = readlink(*argv, srcName, PATH_MAX);
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srcName[nChars] = '\0';
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}
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if (removeoldFlag == TRUE) {
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status = (unlink(linkName) && errno != ENOENT);
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if (status != 0) {
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perror(linkName);
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exit FALSE;
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}
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}
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if (symlinkFlag == TRUE)
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status = symlink(*argv, linkName);
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else
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status = link(*argv, linkName);
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if (status != 0) {
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perror(linkName);
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exit FALSE;
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}
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}
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exit TRUE;
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}
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