94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
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* The President and Fellows of Harvard College.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <err.h>
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/*
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* ln - hardlink or symlink files
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*
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* Usage: ln oldfile newfile
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* ln -s symlinkcontents symlinkfile
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*/
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/*
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* Create a symlink with filename PATH that contains text TEXT.
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* When fed to ls -l, this produces something that looks like
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*
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* lrwxrwxrwx [stuff] PATH -> TEXT
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*/
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static
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void
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dosymlink(const char *text, const char *path)
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{
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if (symlink(text, path)) {
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err(1, "%s", path);
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}
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}
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/*
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* Create a hard link such that NEWFILE names the same file as
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* OLDFILE. Since it's a hard link, the two names for the file
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* are equal; both are the "real" file.
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*/
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static
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void
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dohardlink(const char *oldfile, const char *newfile)
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{
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if (link(oldfile, newfile)) {
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err(1, "%s or %s", oldfile, newfile);
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exit(1);
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}
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}
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int
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main(int argc, char *argv[])
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{
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/*
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* Just do whatever was asked for.
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*
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* We don't allow the Unix model where you can do
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* ln [-s] file1 file2 file3 destination-directory
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*/
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if (argc==4 && !strcmp(argv[1], "-s")) {
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dosymlink(argv[2], argv[3]);
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}
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else if (argc==3) {
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dohardlink(argv[1], argv[2]);
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}
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else {
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warnx("Usage: ln oldfile newfile");
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errx(1, " ln -s symlinkcontents symlinkfile\n");
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}
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return 0;
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}
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