mv.c revision 1.10 
1/*	$NetBSD: mv.c,v 1.10 1997/01/09 16:44:06 tls Exp $	*/
2
3/*
4 * Copyright (c) 1989, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Ken Smith of The State University of New York at Buffalo.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the University of
21 *	California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39#ifndef lint
40static char copyright[] =
41"@(#) Copyright (c) 1989, 1993, 1994\n\
42	The Regents of the University of California.  All rights reserved.\n";
43#endif /* not lint */
44
45#ifndef lint
46#if 0
47static char sccsid[] = "@(#)mv.c	8.2 (Berkeley) 4/2/94";
48#else
49static char rcsid[] = "$NetBSD: mv.c,v 1.10 1997/01/09 16:44:06 tls Exp $";
50#endif
51#endif /* not lint */
52
53#include <sys/param.h>
54#include <sys/time.h>
55#include <sys/wait.h>
56#include <sys/stat.h>
57
58#include <err.h>
59#include <errno.h>
60#include <fcntl.h>
61#include <stdio.h>
62#include <stdlib.h>
63#include <string.h>
64#include <unistd.h>
65
66#include "pathnames.h"
67
68int fflg, iflg;
69int stdin_ok;
70
71int	copy __P((char *, char *));
72int	do_move __P((char *, char *));
73int	fastcopy __P((char *, char *, struct stat *));
74void	usage __P((void));
75
76int
77main(argc, argv)
78	int argc;
79	char *argv[];
80{
81	int baselen, len, rval;
82	char *p, *endp;
83	struct stat sb;
84	int ch;
85	char path[MAXPATHLEN + 1];
86
87	while ((ch = getopt(argc, argv, "if")) != -1)
88		switch (ch) {
89		case 'i':
90			fflg = 0;
91			iflg = 1;
92			break;
93		case 'f':
94			iflg = 0;
95			fflg = 1;
96			break;
97		case '?':
98		default:
99			usage();
100		}
101	argc -= optind;
102	argv += optind;
103
104	if (argc < 2)
105		usage();
106
107	stdin_ok = isatty(STDIN_FILENO);
108
109	/*
110	 * If the stat on the target fails or the target isn't a directory,
111	 * try the move.  More than 2 arguments is an error in this case.
112	 */
113	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
114		if (argc > 2)
115			usage();
116		exit(do_move(argv[0], argv[1]));
117	}
118
119	/* It's a directory, move each file into it. */
120	(void)strcpy(path, argv[argc - 1]);
121	baselen = strlen(path);
122	endp = &path[baselen];
123	*endp++ = '/';
124	++baselen;
125	for (rval = 0; --argc; ++argv) {
126		if ((p = strrchr(*argv, '/')) == NULL)
127			p = *argv;
128		else
129			++p;
130		if ((baselen + (len = strlen(p))) >= MAXPATHLEN) {
131			warnx("%s: destination pathname too long", *argv);
132			rval = 1;
133		} else {
134			memmove(endp, p, len + 1);
135			if (do_move(*argv, path))
136				rval = 1;
137		}
138	}
139	exit(rval);
140}
141
142int
143do_move(from, to)
144	char *from, *to;
145{
146	struct stat sb;
147	char modep[15];
148
149	/*
150	 * (1)	If the destination path exists, the -f option is not specified
151	 *	and either of the following conditions are true:
152	 *
153	 *	(a) The perimissions of the destination path do not permit
154	 *	    writing and the standard input is a terminal.
155	 *	(b) The -i option is specified.
156	 *
157	 *	the mv utility shall write a prompt to standard error and
158	 *	read a line from standard input.  If the response is not
159	 *	affirmative, mv shall do nothing more with the current
160	 *	source file...
161	 */
162	if (!fflg && !access(to, F_OK)) {
163		int ask = 1;
164		int ch;
165
166		if (iflg) {
167			(void)fprintf(stderr, "overwrite %s? ", to);
168		} else if (stdin_ok && access(to, W_OK) && !stat(to, &sb)) {
169			strmode(sb.st_mode, modep);
170			(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
171			    modep + 1, modep[9] == ' ' ? "" : " ",
172			    user_from_uid(sb.st_uid, 0),
173			    group_from_gid(sb.st_gid, 0), to);
174		} else
175			ask = 0;
176		if (ask) {
177			if ((ch = getchar()) != EOF && ch != '\n')
178				while (getchar() != '\n');
179			if (ch != 'y' && ch != 'Y')
180				return (0);
181		}
182	}
183
184	/*
185	 * (2)	If rename() succeeds, mv shall do nothing more with the
186	 *	current source file.  If it fails for any other reason than
187	 *	EXDEV, mv shall write a diagnostic message to the standard
188	 *	error and do nothing more with the current source file.
189	 *
190	 * (3)	If the destination path exists, and it is a file of type
191	 *	directory and source_file is not a file of type directory,
192	 *	or it is a file not of type directory, and source file is
193	 *	a file of type directory, mv shall write a diagnostic
194	 *	message to standard error, and do nothing more with the
195	 *	current source file...
196	 */
197	if (!rename(from, to))
198		return (0);
199
200	if (errno != EXDEV) {
201		warn("rename %s to %s", from, to);
202		return (1);
203	}
204
205	/*
206	 * (4)	If the destination path exists, mv shall attempt to remove it.
207	 *	If this fails for any reason, mv shall write a diagnostic
208	 *	message to the standard error and do nothing more with the
209	 *	current source file...
210	 */
211	if (!stat(to, &sb)) {
212		if ((S_ISDIR(sb.st_mode)) ? rmdir(to) : unlink(to)) {
213			warn("can't remove %s", to);
214			return (1);
215		}
216	}
217
218	/*
219	 * (5)	The file hierarchy rooted in source_file shall be duplicated
220	 *	as a file hiearchy rooted in the destination path...
221	 */
222	if (stat(from, &sb)) {
223		warn("%s", from);
224		return (1);
225	}
226	return (S_ISREG(sb.st_mode) ?
227	    fastcopy(from, to, &sb) : copy(from, to));
228}
229
230int
231fastcopy(from, to, sbp)
232	char *from, *to;
233	struct stat *sbp;
234{
235	struct timeval tval[2];
236	static u_int blen;
237	static char *bp;
238	int nread, from_fd, to_fd;
239
240	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
241		warn("%s", from);
242		return (1);
243	}
244	if ((to_fd =
245	    open(to, O_CREAT | O_TRUNC | O_WRONLY, sbp->st_mode)) < 0) {
246		warn("%s", to);
247		(void)close(from_fd);
248		return (1);
249	}
250	if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
251		warn(NULL);
252		return (1);
253	}
254	while ((nread = read(from_fd, bp, blen)) > 0)
255		if (write(to_fd, bp, nread) != nread) {
256			warn("%s", to);
257			goto err;
258		}
259	if (nread < 0) {
260		warn("%s", from);
261err:		if (unlink(to))
262			warn("%s: remove", to);
263		(void)close(from_fd);
264		(void)close(to_fd);
265		return (1);
266	}
267	(void)close(from_fd);
268
269	if (fchown(to_fd, sbp->st_uid, sbp->st_gid))
270		warn("%s: set owner/group", to);
271	if (fchmod(to_fd, sbp->st_mode))
272		warn("%s: set mode", to);
273
274	tval[0].tv_sec = sbp->st_atime;
275	tval[1].tv_sec = sbp->st_mtime;
276	tval[0].tv_usec = tval[1].tv_usec = 0;
277	if (utimes(to, tval))
278		warn("%s: set times", to);
279
280	if (close(to_fd)) {
281		warn("%s", to);
282		return (1);
283	}
284
285	if (unlink(from)) {
286		warn("%s: remove", from);
287		return (1);
288	}
289	return (0);
290}
291
292int
293copy(from, to)
294	char *from, *to;
295{
296	int pid, status;
297
298	if ((pid = vfork()) == 0) {
299		execl(_PATH_CP, "mv", "-PRp", from, to, NULL);
300		warn("%s", _PATH_CP);
301		_exit(1);
302	}
303	if (waitpid(pid, &status, 0) == -1) {
304		warn("%s: waitpid", _PATH_CP);
305		return (1);
306	}
307	if (!WIFEXITED(status)) {
308		warn("%s: did not terminate normally", _PATH_CP);
309		return (1);
310	}
311	if (WEXITSTATUS(status)) {
312		warn("%s: terminated with %d (non-zero) status",
313		    _PATH_CP, WEXITSTATUS(status));
314		return (1);
315	}
316	if (!(pid = vfork())) {
317		execl(_PATH_RM, "mv", "-rf", from, NULL);
318		warn("%s", _PATH_RM);
319		_exit(1);
320	}
321	if (waitpid(pid, &status, 0) == -1) {
322		warn("%s: waitpid", _PATH_RM);
323		return (1);
324	}
325	if (!WIFEXITED(status)) {
326		warn("%s: did not terminate normally", _PATH_RM);
327		return (1);
328	}
329	if (WEXITSTATUS(status)) {
330		warn("%s: terminated with %d (non-zero) status",
331		    _PATH_RM, WEXITSTATUS(status));
332		return (1);
333	}
334	return (0);
335}
336
337void
338usage()
339{
340
341	(void)fprintf(stderr, "usage: mv [-fi] source target\n");
342	(void)fprintf(stderr, "       mv [-fi] source ... directory\n");
343	exit(1);
344}
345