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7e7574af89
Submitted by: bde
222 lines
5.5 KiB
C
222 lines
5.5 KiB
C
/*
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* Copyright (c) 1987, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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 REGENTS 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 REGENTS 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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#ifndef lint
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static char const copyright[] =
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"@(#) Copyright (c) 1987, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)ln.c 8.2 (Berkeley) 3/31/94";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int fflag; /* Unlink existing files. */
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int iflag; /* Interactive mode. */
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int sflag; /* Symbolic, not hard, link. */
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int vflag; /* Verbose output. */
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/* System link call. */
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int (*linkf) __P((const char *, const char *));
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char linkch;
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int linkit __P((char *, char *, int));
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void usage __P((void));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct stat sb;
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int ch, exitval;
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char *p, *sourcedir;
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/*
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* Test for the special case where the utility is called as
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* "link", for which the functionality provided is greatly
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* simplified.
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*/
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if ((p = rindex(argv[0], '/')) == NULL)
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p = argv[0];
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else
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++p;
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if (strcmp(p, "link") == 0) {
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if (argc == 3) {
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linkf = link;
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exit(linkit(argv[1], argv[2], 0));
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} else
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usage();
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}
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while ((ch = getopt(argc, argv, "fisv")) != -1)
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switch (ch) {
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case 'f':
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fflag = 1;
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iflag = 0;
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break;
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case 'i':
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iflag = 1;
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fflag = 0;
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break;
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case 's':
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sflag = 1;
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break;
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case 'v':
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vflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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argv += optind;
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argc -= optind;
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linkf = sflag ? symlink : link;
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linkch = sflag ? '-' : '=';
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switch(argc) {
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case 0:
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usage();
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case 1: /* ln target */
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exit(linkit(argv[0], ".", 1));
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case 2: /* ln target source */
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exit(linkit(argv[0], argv[1], 0));
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}
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/* ln target1 target2 directory */
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sourcedir = argv[argc - 1];
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if (stat(sourcedir, &sb))
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err(1, "%s", sourcedir);
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if (!S_ISDIR(sb.st_mode))
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usage();
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for (exitval = 0; *argv != sourcedir; ++argv)
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exitval |= linkit(*argv, sourcedir, 1);
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exit(exitval);
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}
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int
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linkit(target, source, isdir)
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char *target, *source;
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int isdir;
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{
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struct stat sb;
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int ch, exists, first;
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char *p, path[MAXPATHLEN];
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if (!sflag) {
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/* If target doesn't exist, quit now. */
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if (stat(target, &sb)) {
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warn("%s", target);
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return (1);
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}
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/* Only symbolic links to directories. */
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if (S_ISDIR(sb.st_mode)) {
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errno = EISDIR;
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warn("%s", target);
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return (1);
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}
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}
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/* If the source is a directory, append the target's name. */
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if (isdir || ((exists = !stat(source, &sb)) && S_ISDIR(sb.st_mode))) {
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if ((p = strrchr(target, '/')) == NULL)
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p = target;
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else
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++p;
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(void)snprintf(path, sizeof(path), "%s/%s", source, p);
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source = path;
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exists = !lstat(source, &sb);
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} else
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exists = !lstat(source, &sb);
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/*
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* If the file exists, then unlink it forcibly if -f was specified
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* and interactively if -i was specified.
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*/
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if (fflag && exists) {
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if (unlink(source)) {
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warn("%s", source);
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return (1);
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}
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} else if (iflag && exists) {
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fflush(stdout);
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fprintf(stderr, "replace %s? ", source);
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first = ch = getchar();
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while(ch != '\n' && ch != EOF)
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ch = getchar();
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if (first != 'y' && first != 'Y') {
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fprintf(stderr, "not replaced\n");
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return (1);
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}
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if (unlink(source)) {
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warn("%s", source);
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return (1);
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}
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}
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/* Attempt the link. */
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if ((*linkf)(target, source)) {
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warn("%s", source);
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return (1);
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}
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if (vflag)
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(void)printf("%s %c> %s\n", source, linkch, target);
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return (0);
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}
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void
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usage()
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{
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(void)fprintf(stderr, "%s\n%s\n%s\n",
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"usage: ln [-fisv] file1 file2",
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" ln [-fisv] file ... directory",
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" link file1 file2");
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exit(1);
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}
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