mv.c revision 1.8 
1/*
2 * Copyright (c) 1989, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Ken Smith of The State University of New York at Buffalo.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38static char copyright[] =
39"@(#) Copyright (c) 1989, 1993, 1994\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44/*static char sccsid[] = "from: @(#)mv.c	8.2 (Berkeley) 4/2/94";*/
45static char *rcsid = "$Id: mv.c,v 1.8 1994/09/22 09:25:44 mycroft Exp $";
46#endif /* not lint */
47
48#include <sys/param.h>
49#include <sys/time.h>
50#include <sys/wait.h>
51#include <sys/stat.h>
52
53#include <err.h>
54#include <errno.h>
55#include <fcntl.h>
56#include <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59#include <unistd.h>
60
61#include "pathnames.h"
62
63int fflg, iflg;
64int stdin_ok;
65
66int	copy __P((char *, char *));
67int	do_move __P((char *, char *));
68int	fastcopy __P((char *, char *, struct stat *));
69void	usage __P((void));
70
71int
72main(argc, argv)
73	int argc;
74	char *argv[];
75{
76	register int baselen, len, rval;
77	register char *p, *endp;
78	struct stat sb;
79	int ch;
80	char path[MAXPATHLEN + 1];
81
82	while ((ch = getopt(argc, argv, "if")) != -1)
83		switch (ch) {
84		case 'i':
85			fflg = 0;
86			iflg = 1;
87			break;
88		case 'f':
89			iflg = 0;
90			fflg = 1;
91			break;
92		case '?':
93		default:
94			usage();
95		}
96	argc -= optind;
97	argv += optind;
98
99	if (argc < 2)
100		usage();
101
102	stdin_ok = isatty(STDIN_FILENO);
103
104	/*
105	 * If the stat on the target fails or the target isn't a directory,
106	 * try the move.  More than 2 arguments is an error in this case.
107	 */
108	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
109		if (argc > 2)
110			usage();
111		exit(do_move(argv[0], argv[1]));
112	}
113
114	/* It's a directory, move each file into it. */
115	(void)strcpy(path, argv[argc - 1]);
116	baselen = strlen(path);
117	endp = &path[baselen];
118	*endp++ = '/';
119	++baselen;
120	for (rval = 0; --argc; ++argv) {
121		if ((p = strrchr(*argv, '/')) == NULL)
122			p = *argv;
123		else
124			++p;
125		if ((baselen + (len = strlen(p))) >= MAXPATHLEN) {
126			warnx("%s: destination pathname too long", *argv);
127			rval = 1;
128		} else {
129			memmove(endp, p, len + 1);
130			if (do_move(*argv, path))
131				rval = 1;
132		}
133	}
134	exit(rval);
135}
136
137int
138do_move(from, to)
139	char *from, *to;
140{
141	struct stat sb;
142	char modep[15];
143
144	/*
145	 * (1)	If the destination path exists, the -f option is not specified
146	 *	and either of the following conditions are true:
147	 *
148	 *	(a) The perimissions of the destination path do not permit
149	 *	    writing and the standard input is a terminal.
150	 *	(b) The -i option is specified.
151	 *
152	 *	the mv utility shall write a prompt to standard error and
153	 *	read a line from standard input.  If the response is not
154	 *	affirmative, mv shall do nothing more with the current
155	 *	source file...
156	 */
157	if (!fflg && !access(to, F_OK)) {
158		int ask = 1;
159		int ch;
160
161		if (iflg) {
162			(void)fprintf(stderr, "overwrite %s? ", to);
163		} else if (stdin_ok && access(to, W_OK) && !stat(to, &sb)) {
164			strmode(sb.st_mode, modep);
165			(void)fprintf(stderr, "override %s%s%s/%s for %s? ",
166			    modep + 1, modep[9] == ' ' ? "" : " ",
167			    user_from_uid(sb.st_uid, 0),
168			    group_from_gid(sb.st_gid, 0), to);
169		} else
170			ask = 0;
171		if (ask) {
172			if ((ch = getchar()) != EOF && ch != '\n')
173				while (getchar() != '\n');
174			if (ch != 'y' && ch != 'Y')
175				return (0);
176		}
177	}
178
179	/*
180	 * (2)	If rename() succeeds, mv shall do nothing more with the
181	 *	current source file.  If it fails for any other reason than
182	 *	EXDEV, mv shall write a diagnostic message to the standard
183	 *	error and do nothing more with the current source file.
184	 *
185	 * (3)	If the destination path exists, and it is a file of type
186	 *	directory and source_file is not a file of type directory,
187	 *	or it is a file not of type directory, and source file is
188	 *	a file of type directory, mv shall write a diagnostic
189	 *	message to standard error, and do nothing more with the
190	 *	current source file...
191	 */
192	if (!rename(from, to))
193		return (0);
194
195	if (errno != EXDEV) {
196		warn("rename %s to %s", from, to);
197		return (1);
198	}
199
200	/*
201	 * (4)	If the destination path exists, mv shall attempt to remove it.
202	 *	If this fails for any reason, mv shall write a diagnostic
203	 *	message to the standard error and do nothing more with the
204	 *	current source file...
205	 */
206	if (!stat(to, &sb)) {
207		if ((S_ISDIR(sb.st_mode)) ? rmdir(to) : unlink(to)) {
208			warn("can't remove %s", to);
209			return (1);
210		}
211	}
212
213	/*
214	 * (5)	The file hierarchy rooted in source_file shall be duplicated
215	 *	as a file hiearchy rooted in the destination path...
216	 */
217	if (stat(from, &sb)) {
218		warn("%s", from);
219		return (1);
220	}
221	return (S_ISREG(sb.st_mode) ?
222	    fastcopy(from, to, &sb) : copy(from, to));
223}
224
225int
226fastcopy(from, to, sbp)
227	char *from, *to;
228	struct stat *sbp;
229{
230	struct timeval tval[2];
231	static u_int blen;
232	static char *bp;
233	register int nread, from_fd, to_fd;
234
235	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
236		warn("%s", from);
237		return (1);
238	}
239	if ((to_fd =
240	    open(to, O_CREAT | O_TRUNC | O_WRONLY, sbp->st_mode)) < 0) {
241		warn("%s", to);
242		(void)close(from_fd);
243		return (1);
244	}
245	if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
246		warn(NULL);
247		return (1);
248	}
249	while ((nread = read(from_fd, bp, blen)) > 0)
250		if (write(to_fd, bp, nread) != nread) {
251			warn("%s", to);
252			goto err;
253		}
254	if (nread < 0) {
255		warn("%s", from);
256err:		if (unlink(to))
257			warn("%s: remove", to);
258		(void)close(from_fd);
259		(void)close(to_fd);
260		return (1);
261	}
262	(void)close(from_fd);
263
264	if (fchown(to_fd, sbp->st_uid, sbp->st_gid))
265		warn("%s: set owner/group", to);
266	if (fchmod(to_fd, sbp->st_mode))
267		warn("%s: set mode", to);
268
269	tval[0].tv_sec = sbp->st_atime;
270	tval[1].tv_sec = sbp->st_mtime;
271	tval[0].tv_usec = tval[1].tv_usec = 0;
272	if (utimes(to, tval))
273		warn("%s: set times", to);
274
275	if (close(to_fd)) {
276		warn("%s", to);
277		return (1);
278	}
279
280	if (unlink(from)) {
281		warn("%s: remove", from);
282		return (1);
283	}
284	return (0);
285}
286
287int
288copy(from, to)
289	char *from, *to;
290{
291	int pid, status;
292
293	if ((pid = vfork()) == 0) {
294		execl(_PATH_CP, "mv", "-PRp", from, to, NULL);
295		warn("%s", _PATH_CP);
296		_exit(1);
297	}
298	if (waitpid(pid, &status, 0) == -1) {
299		warn("%s: waitpid", _PATH_CP);
300		return (1);
301	}
302	if (!WIFEXITED(status)) {
303		warn("%s: did not terminate normally", _PATH_CP);
304		return (1);
305	}
306	if (WEXITSTATUS(status)) {
307		warn("%s: terminated with %d (non-zero) status",
308		    _PATH_CP, WEXITSTATUS(status));
309		return (1);
310	}
311	if (!(pid = vfork())) {
312		execl(_PATH_RM, "mv", "-rf", from, NULL);
313		warn("%s", _PATH_RM);
314		_exit(1);
315	}
316	if (waitpid(pid, &status, 0) == -1) {
317		warn("%s: waitpid", _PATH_RM);
318		return (1);
319	}
320	if (!WIFEXITED(status)) {
321		warn("%s: did not terminate normally", _PATH_RM);
322		return (1);
323	}
324	if (WEXITSTATUS(status)) {
325		warn("%s: terminated with %d (non-zero) status",
326		    _PATH_RM, WEXITSTATUS(status));
327		return (1);
328	}
329	return (0);
330}
331
332void
333usage()
334{
335
336	(void)fprintf(stderr, "usage: mv [-fi] source target\n");
337	(void)fprintf(stderr, "       mv [-fi] source ... directory\n");
338	exit(1);
339}
340