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LN.C
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1993-07-02
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234 lines
/*
* 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.
*/
#ifdef DF_POSIX /* DF_DSC */
#include <misc.h>
#include <bsdlib.h>
#endif
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1987 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)ln.c 4.15 (Berkeley) 2/24/91";
#endif /* not lint */
#ifdef DF_POSIX /* DF_DSC */
#include <sys/cdefs.h>
#else
#include <sys/param.h>
#endif
#include <sys/stat.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
static int dirflag, /* undocumented force flag */
#ifndef _POSIX_SOURCE
sflag, /* symbolic, not hard, link */
#endif
(*linkf) __P((const char *, const char *)); /* system link call */
static int linkit __P((char *, char *, int));
static void usage __P((void));
#if WIN_NT
extern int globulate __P((int, int, char **));
extern void deglobulate __P((void));
extern int globulated_argc;
extern char **globulated_argv;
pid_t ppid;
int globulation;
#endif
int
#if __STDC__
main (int argc, char **argv)
#else
main(argc, argv)
int argc;
char **argv;
#endif
{
extern int optind;
struct stat buf;
#ifdef _POSIX_SOURCE /* DF_MSS */
int ch, exitval;
#else
int ch, exitval, link(), symlink();
#endif
char *sourcedir;
#if WIN_NT
ppid = getppid();
if (ppid == (pid_t) 1) /* if parent is CMD.EXE */
{
globulation = globulate(1, argc, argv);
if (globulation == 0)
{
argc = globulated_argc;
argv = globulated_argv;
}
}
#endif
while ((ch = getopt(argc, argv, "Fs")) != EOF)
switch((char)ch) {
case 'F':
dirflag = 1;
break;
#ifndef _POSIX_SOURCE /* DF_MSS */
case 's':
sflag = 1;
break;
#endif
case '?':
default:
usage();
}
argv += optind;
argc -= optind;
#ifdef _POSIX_SOURCE /* DF_MSS */
linkf = link;
#else
linkf = sflag ? symlink : link;
#endif
switch(argc) {
case 0:
usage();
case 1: /* ln target */
exitval = linkit(argv[0], ".", 1);
break;
case 2: /* ln target source */
exitval = linkit(argv[0], argv[1], 0);
break;
default: /* ln target1 target2 directory */
sourcedir = argv[argc - 1];
if (stat(sourcedir, &buf)) {
(void)fprintf(stderr,
"ln: %s: %s\n", sourcedir, strerror(errno));
#if WIN_NT
if (ppid == (pid_t) 1 && globulation == 0)
deglobulate();
#endif
exit(EXIT_FAILURE);
}
if (!S_ISDIR(buf.st_mode))
usage();
for (exitval = EXIT_SUCCESS; *argv != sourcedir; ++argv)
exitval |= linkit(*argv, sourcedir, 1);
break;
}
#if WIN_NT
if (ppid == (pid_t) 1 && globulation == 0)
deglobulate();
#endif
return exitval;
}
static int
#if __STDC__
linkit (char *target, char *source, int isdir)
#else
linkit(target, source, isdir)
char *target, *source;
int isdir;
#endif
{
struct stat buf;
char path[MAXPATHLEN], *cp;
#ifndef _POSIX_SOURCE
if (!sflag) {
#endif
/* if target doesn't exist, quit now */
if (stat(target, &buf)) {
(void)fprintf(stderr,
"ln: %s: %s\n", target, strerror(errno));
return(EXIT_FAILURE);
}
/* 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", target);
return(EXIT_FAILURE);
}
#ifndef _POSIX_SOURCE
}
#endif
/* if the source is a directory, append the target's name */
if (isdir || !stat(source, &buf) && (buf.st_mode & S_IFMT) == S_IFDIR) {
if (!(cp = rindex(target, '/')))
cp = target;
else
++cp;
(void)sprintf(path, "%s/%s", source, cp);
source = path;
}
#if 0 && DF_POSIX
printf ("linkit %s %s\n", target, source);
#endif
if ((*linkf)(target, source)) {
(void)fprintf(stderr, "ln: %s: %s\n", source, strerror(errno));
return(EXIT_FAILURE);
}
return(EXIT_SUCCESS);
}
static void
#if __STDC__
usage (void)
#else
usage()
#endif
{
(void)fprintf(stderr,
#ifdef _POSIX_SOURCE /* DF_MSS */
"usage:\tln file1 file2\n\tln file ... directory\n");
#else
"usage:\tln [-s] file1 file2\n\tln [-s] file ... directory\n");
#endif
#if WIN_NT
if (ppid == (pid_t) 1 && globulation == 0)
deglobulate();
#endif
exit(EXIT_FAILURE);
}