NetBSD/bin/ln/ln.c

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/*
* Copyright (c) 1987 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1987 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
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/*static char sccsid[] = "from: @(#)ln.c 4.15 (Berkeley) 2/24/91";*/
static char rcsid[] = "$Id: ln.c,v 1.5 1993/08/17 01:03:51 jtc Exp $";
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#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
static int forceflag, /* force link by removing target */
dirflag, /* allow hard links to directories */
sflag, /* symbolic, not hard, link */
(*linkf)(); /* system link call */
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static linkit(), usage();
main(argc, argv)
int argc;
char **argv;
{
extern int optind;
struct stat buf;
int ch, exitval, link(), symlink();
char *sourcedir;
while ((ch = getopt(argc, argv, "fFs")) != EOF)
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switch((char)ch) {
case 'f':
forceflag = 1;
break;
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case 'F':
dirflag = 1;
break;
case 's':
sflag = 1;
break;
case '?':
default:
usage();
}
argv += optind;
argc -= optind;
linkf = sflag ? symlink : link;
switch(argc) {
case 0:
usage();
case 1: /* ln target */
exit(linkit(argv[0], ".", 1));
case 2: /* ln target source */
exit(linkit(argv[0], argv[1], 0));
default: /* ln target1 target2 directory */
sourcedir = argv[argc - 1];
if (stat(sourcedir, &buf)) {
(void)fprintf(stderr,
"ln: %s: %s\n", sourcedir, strerror(errno));
exit(1);
}
if (!S_ISDIR(buf.st_mode))
usage();
for (exitval = 0; *argv != sourcedir; ++argv)
exitval |= linkit(*argv, sourcedir, 1);
exit(exitval);
}
/* NOTREACHED */
}
static
linkit(source, target, isdir)
char *source, *target;
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int isdir;
{
struct stat buf;
char path[MAXPATHLEN], *cp;
if (!sflag) {
/* if source doesn't exist, quit now */
if (stat(source, &buf)) {
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(void)fprintf(stderr,
"ln: %s: %s\n", source, strerror(errno));
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return(1);
}
/* only symbolic links to directories, unless -F option used */
if (!dirflag && (buf.st_mode & S_IFMT) == S_IFDIR) {
(void)printf("ln: %s is a directory.\n", source);
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return(1);
}
}
/* if the target is a directory, append the source's name */
if (isdir || !stat(target, &buf) && S_ISDIR(buf.st_mode)) {
if (!(cp = rindex(source, '/')))
cp = source;
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else
++cp;
(void)sprintf(path, "%s/%s", target, cp);
target = path;
}
/* Remove existing file if -f is was specified */
if (forceflag && unlink (target) && errno != ENOENT) {
(void)fprintf(stderr, "ln: %s: %s\n", target, strerror(errno));
return (1);
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}
if ((*linkf)(source, target)) {
(void)fprintf(stderr, "ln: %s: %s\n", target, strerror(errno));
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return(1);
}
return(0);
}
static
usage()
{
(void)fprintf(stderr,
"usage:\tln [-fs] file1 file2\n\tln [-fs] file ... directory\n");
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exit(1);
}