mv.c revision 1.5 
1/*
2 * Copyright (c) 1989 The Regents of the University of California.
3 * 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
38char copyright[] =
39"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
40 All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44/*static char sccsid[] = "from: @(#)mv.c	5.11 (Berkeley) 4/3/91";*/
45static char rcsid[] = "$Id: mv.c,v 1.5 1993/09/22 00:34:27 jtc 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#include <fcntl.h>
53#include <errno.h>
54#include <unistd.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include "pathnames.h"
59
60int fflg, iflg;
61
62main(argc, argv)
63	int argc;
64	char **argv;
65{
66	extern char *optarg;
67	extern int optind;
68	register int baselen, exitval, len;
69	register char *p, *endp;
70	struct stat sb;
71	int ch;
72	char path[MAXPATHLEN + 1];
73
74	while (((ch = getopt(argc, argv, "if")) != -1))
75		switch((char)ch) {
76		case 'i':
77			fflg = 0;
78			iflg = 1;
79			break;
80		case 'f':
81			iflg = 0;
82			fflg = 1;
83			break;
84		case '?':
85		default:
86			usage();
87		}
88	argc -= optind;
89	argv += optind;
90
91	if (argc < 2)
92		usage();
93
94	/*
95	 * If the stat on the target fails or the target isn't a directory,
96	 * try the move.  More than 2 arguments is an error in this case.
97	 */
98	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
99		if (argc > 2)
100			usage();
101		exit(do_move(argv[0], argv[1]));
102	}
103
104	/* It's a directory, move each file into it. */
105	(void)strcpy(path, argv[argc - 1]);
106	baselen = strlen(path);
107	endp = &path[baselen];
108	*endp++ = '/';
109	++baselen;
110	for (exitval = 0; --argc; ++argv) {
111		if ((p = rindex(*argv, '/')) == NULL)
112			p = *argv;
113		else
114			++p;
115		if ((baselen + (len = strlen(p))) >= MAXPATHLEN)
116			(void)fprintf(stderr,
117			    "mv: %s: destination pathname too long\n", *argv);
118		else {
119			bcopy(p, endp, len + 1);
120			exitval |= do_move(*argv, path);
121		}
122	}
123	exit(exitval);
124}
125
126do_move(from, to)
127	char *from, *to;
128{
129	struct stat sb;
130	int ask, ch;
131
132	/*
133	 * Check access.  If interactive and file exists, ask user if it
134	 * should be replaced.  Otherwise if file exists but isn't writable
135	 * make sure the user wants to clobber it.
136	 */
137	if (!fflg && !access(to, F_OK)) {
138		ask = 0;
139		if (iflg) {
140			(void)fprintf(stderr, "overwrite %s? ", to);
141			ask = 1;
142		}
143		else if (access(to, W_OK) && !stat(to, &sb)) {
144			(void)fprintf(stderr, "override mode %o on %s? ",
145			    sb.st_mode & 07777, to);
146			ask = 1;
147		}
148		if (ask) {
149			if ((ch = getchar()) != EOF && ch != '\n')
150				while (getchar() != '\n');
151			if (ch != 'y')
152				return(0);
153		}
154	}
155	if (!rename(from, to))
156		return(0);
157
158	if (errno != EXDEV) {
159		(void)fprintf(stderr,
160		    "mv: rename %s to %s: %s\n", from, to, strerror(errno));
161		return(1);
162	}
163
164	/*
165	 * If rename fails, and it's a regular file, do the copy internally;
166	 * otherwise, use cp and rm.
167	 */
168	if (stat(from, &sb)) {
169		(void)fprintf(stderr, "mv: %s: %s\n", from, strerror(errno));
170		return(1);
171	}
172	return(S_ISREG(sb.st_mode) ?
173	    fastcopy(from, to, &sb) : copy(from, to));
174}
175
176fastcopy(from, to, sbp)
177	char *from, *to;
178	struct stat *sbp;
179{
180	struct timeval tval[2];
181	static u_int blen;
182	static char *bp;
183	register int nread, from_fd, to_fd;
184
185	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
186		error(from);
187		return(1);
188	}
189	if ((to_fd = open(to, O_CREAT|O_TRUNC|O_WRONLY, sbp->st_mode)) < 0) {
190		error(to);
191		(void)close(from_fd);
192		return(1);
193	}
194	if (!blen && !(bp = malloc(blen = sbp->st_blksize))) {
195		error(NULL);
196		return(1);
197	}
198	while ((nread = read(from_fd, bp, blen)) > 0)
199		if (write(to_fd, bp, nread) != nread) {
200			error(to);
201			goto err;
202		}
203	if (nread < 0) {
204		error(from);
205err:		(void)unlink(to);
206		(void)close(from_fd);
207		(void)close(to_fd);
208		return(1);
209	}
210	(void)fchown(to_fd, sbp->st_uid, sbp->st_gid);
211	(void)fchmod(to_fd, sbp->st_mode);
212
213	(void)close(from_fd);
214	(void)close(to_fd);
215
216	tval[0].tv_sec = sbp->st_atime;
217	tval[1].tv_sec = sbp->st_mtime;
218	tval[0].tv_usec = tval[1].tv_usec = 0;
219	(void)utimes(to, tval);
220	(void)unlink(from);
221	return(0);
222}
223
224copy(from, to)
225	char *from, *to;
226{
227	int pid, status;
228
229	if (!(pid = vfork())) {
230		execl(_PATH_CP, "mv", "-pr", from, to, NULL);
231		error(_PATH_CP);
232		_exit(1);
233	}
234	(void)waitpid(pid, &status, 0);
235	if (!WIFEXITED(status) || WEXITSTATUS(status))
236		return(1);
237	if (!(pid = vfork())) {
238		execl(_PATH_RM, "mv", "-rf", from, NULL);
239		error(_PATH_RM);
240		_exit(1);
241	}
242	(void)waitpid(pid, &status, 0);
243	return(!WIFEXITED(status) || WEXITSTATUS(status));
244}
245
246error(s)
247	char *s;
248{
249	if (s)
250		(void)fprintf(stderr, "mv: %s: %s\n", s, strerror(errno));
251	else
252		(void)fprintf(stderr, "mv: %s\n", strerror(errno));
253}
254
255usage()
256{
257	(void)fprintf(stderr,
258		"usage: mv [-fi] source_file target_file\n"
259		"       mv [-fi] source_file ... target_dir\n");
260	exit(1);
261}
262