touch.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 4. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33
34__FBSDID("$FreeBSD: stable/11/usr.bin/touch/touch.c 330897 2018-03-14 03:19:51Z eadler $");
35
36#ifndef lint
37static const char copyright[] =
38"@(#) Copyright (c) 1993\n\
39	The Regents of the University of California.  All rights reserved.\n";
40#endif
41
42#ifndef lint
43static const char sccsid[] = "@(#)touch.c	8.1 (Berkeley) 6/6/93";
44#endif
45
46#include <sys/types.h>
47#include <sys/stat.h>
48#include <sys/time.h>
49
50#include <ctype.h>
51#include <err.h>
52#include <errno.h>
53#include <fcntl.h>
54#include <libgen.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <time.h>
59#include <unistd.h>
60
61static void	stime_arg1(const char *, struct timespec *);
62static void	stime_arg2(const char *, int, struct timespec *);
63static void	stime_darg(const char *, struct timespec *);
64static void	stime_file(const char *, struct timespec *);
65static int	timeoffset(const char *);
66static void	usage(const char *);
67
68int
69main(int argc, char *argv[])
70{
71	struct stat sb;
72	struct timespec ts[2];
73	int atflag;
74	int Aflag, aflag, cflag, mflag, ch, fd, len, rval, timeset;
75	char *p;
76	char *myname;
77
78	myname = basename(argv[0]);
79	Aflag = aflag = cflag = mflag = timeset = 0;
80	atflag = 0;
81	ts[0].tv_sec = ts[1].tv_sec = 0;
82	ts[0].tv_nsec = ts[1].tv_nsec = UTIME_NOW;
83
84	while ((ch = getopt(argc, argv, "A:acd:fhmr:t:")) != -1)
85		switch(ch) {
86		case 'A':
87			Aflag = timeoffset(optarg);
88			break;
89		case 'a':
90			aflag = 1;
91			break;
92		case 'c':
93			cflag = 1;
94			break;
95		case 'd':
96			timeset = 1;
97			stime_darg(optarg, ts);
98			break;
99		case 'f':
100			/* No-op for compatibility. */
101			break;
102		case 'h':
103			cflag = 1;
104			atflag = AT_SYMLINK_NOFOLLOW;
105			break;
106		case 'm':
107			mflag = 1;
108			break;
109		case 'r':
110			timeset = 1;
111			stime_file(optarg, ts);
112			break;
113		case 't':
114			timeset = 1;
115			stime_arg1(optarg, ts);
116			break;
117		default:
118			usage(myname);
119		}
120	argc -= optind;
121	argv += optind;
122
123	if (aflag == 0 && mflag == 0)
124		aflag = mflag = 1;
125
126	if (timeset) {
127		if (Aflag) {
128			/*
129			 * We're setting the time to an offset from a specified
130			 * time.  God knows why, but it means that we can set
131			 * that time once and for all here.
132			 */
133			if (aflag)
134				ts[0].tv_sec += Aflag;
135			if (mflag)
136				ts[1].tv_sec += Aflag;
137			Aflag = 0;		/* done our job */
138		}
139	} else {
140		/*
141		 * If no -r or -t flag, at least two operands, the first of
142		 * which is an 8 or 10 digit number, use the obsolete time
143		 * specification, otherwise use the current time.
144		 */
145		if (argc > 1) {
146			strtol(argv[0], &p, 10);
147			len = p - argv[0];
148			if (*p == '\0' && (len == 8 || len == 10)) {
149				timeset = 1;
150				stime_arg2(*argv++, len == 10, ts);
151			}
152		}
153		/* Both times default to the same. */
154		ts[1] = ts[0];
155	}
156
157	if (!aflag)
158		ts[0].tv_nsec = UTIME_OMIT;
159	if (!mflag)
160		ts[1].tv_nsec = UTIME_OMIT;
161
162	if (*argv == NULL)
163		usage(myname);
164
165	if (Aflag)
166		cflag = 1;
167
168	for (rval = 0; *argv; ++argv) {
169		/* See if the file exists. */
170		if (fstatat(AT_FDCWD, *argv, &sb, atflag) != 0) {
171			if (errno != ENOENT) {
172				rval = 1;
173				warn("%s", *argv);
174				continue;
175			}
176			if (!cflag) {
177				/* Create the file. */
178				fd = open(*argv,
179				    O_WRONLY | O_CREAT, DEFFILEMODE);
180				if (fd == -1 || fstat(fd, &sb) || close(fd)) {
181					rval = 1;
182					warn("%s", *argv);
183					continue;
184				}
185
186				/* If using the current time, we're done. */
187				if (!timeset)
188					continue;
189			} else
190				continue;
191		}
192
193		/*
194		 * We're adjusting the times based on the file times, not a
195		 * specified time (that gets handled above).
196		 */
197		if (Aflag) {
198			if (aflag) {
199				ts[0] = sb.st_atim;
200				ts[0].tv_sec += Aflag;
201			}
202			if (mflag) {
203				ts[1] = sb.st_mtim;
204				ts[1].tv_sec += Aflag;
205			}
206		}
207
208		if (!utimensat(AT_FDCWD, *argv, ts, atflag))
209			continue;
210
211		rval = 1;
212		warn("%s", *argv);
213	}
214	exit(rval);
215}
216
217#define	ATOI2(ar)	((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
218
219static void
220stime_arg1(const char *arg, struct timespec *tvp)
221{
222	time_t now;
223	struct tm *t;
224	int yearset;
225	char *p;
226
227	now = time(NULL);
228	if ((t = localtime(&now)) == NULL)
229		err(1, "localtime");
230					/* [[CC]YY]MMDDhhmm[.SS] */
231	if ((p = strchr(arg, '.')) == NULL)
232		t->tm_sec = 0;		/* Seconds defaults to 0. */
233	else {
234		if (strlen(p + 1) != 2)
235			goto terr;
236		*p++ = '\0';
237		t->tm_sec = ATOI2(p);
238	}
239
240	yearset = 0;
241	switch(strlen(arg)) {
242	case 12:			/* CCYYMMDDhhmm */
243		t->tm_year = ATOI2(arg);
244		t->tm_year *= 100;
245		yearset = 1;
246		/* FALLTHROUGH */
247	case 10:			/* YYMMDDhhmm */
248		if (yearset) {
249			yearset = ATOI2(arg);
250			t->tm_year += yearset;
251		} else {
252			yearset = ATOI2(arg);
253			if (yearset < 69)
254				t->tm_year = yearset + 2000;
255			else
256				t->tm_year = yearset + 1900;
257		}
258		t->tm_year -= 1900;	/* Convert to UNIX time. */
259		/* FALLTHROUGH */
260	case 8:				/* MMDDhhmm */
261		t->tm_mon = ATOI2(arg);
262		--t->tm_mon;		/* Convert from 01-12 to 00-11 */
263		t->tm_mday = ATOI2(arg);
264		t->tm_hour = ATOI2(arg);
265		t->tm_min = ATOI2(arg);
266		break;
267	default:
268		goto terr;
269	}
270
271	t->tm_isdst = -1;		/* Figure out DST. */
272	tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
273	if (tvp[0].tv_sec == -1)
274		goto terr;
275
276	tvp[0].tv_nsec = tvp[1].tv_nsec = 0;
277	return;
278
279terr:
280	errx(1, "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
281}
282
283static void
284stime_arg2(const char *arg, int year, struct timespec *tvp)
285{
286	time_t now;
287	struct tm *t;
288
289	now = time(NULL);
290	if ((t = localtime(&now)) == NULL)
291		err(1, "localtime");
292
293	t->tm_mon = ATOI2(arg);		/* MMDDhhmm[yy] */
294	--t->tm_mon;			/* Convert from 01-12 to 00-11 */
295	t->tm_mday = ATOI2(arg);
296	t->tm_hour = ATOI2(arg);
297	t->tm_min = ATOI2(arg);
298	if (year) {
299		t->tm_year = ATOI2(arg);
300		if (t->tm_year < 39)	/* support 2000-2038 not 1902-1969 */
301			t->tm_year += 100;
302	}
303
304	t->tm_isdst = -1;		/* Figure out DST. */
305	tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
306	if (tvp[0].tv_sec == -1)
307		errx(1,
308	"out of range or illegal time specification: MMDDhhmm[yy]");
309
310	tvp[0].tv_nsec = tvp[1].tv_nsec = 0;
311}
312
313static void
314stime_darg(const char *arg, struct timespec *tvp)
315{
316	struct tm t = { .tm_sec = 0 };
317	const char *fmt, *colon;
318	char *p;
319	int val, isutc = 0;
320
321	tvp[0].tv_nsec = 0;
322	t.tm_isdst = -1;
323	colon = strchr(arg, ':');
324	if (colon == NULL || strchr(colon + 1, ':') == NULL)
325		goto bad;
326	fmt = strchr(arg, 'T') != NULL ? "%Y-%m-%dT%H:%M:%S" :
327	    "%Y-%m-%d %H:%M:%S";
328	p = strptime(arg, fmt, &t);
329	if (p == NULL)
330		goto bad;
331	/* POSIX: must have at least one digit after dot */
332	if ((*p == '.' || *p == ',') && isdigit((unsigned char)p[1])) {
333		p++;
334		val = 100000000;
335		while (isdigit((unsigned char)*p)) {
336			tvp[0].tv_nsec += val * (*p - '0');
337			p++;
338			val /= 10;
339		}
340	}
341	if (*p == 'Z') {
342		isutc = 1;
343		p++;
344	}
345	if (*p != '\0')
346		goto bad;
347
348	tvp[0].tv_sec = isutc ? timegm(&t) : mktime(&t);
349
350	tvp[1] = tvp[0];
351	return;
352
353bad:
354	errx(1, "out of range or illegal time specification: YYYY-MM-DDThh:mm:SS[.frac][tz]");
355}
356
357/* Calculate a time offset in seconds, given an arg of the format [-]HHMMSS. */
358int
359timeoffset(const char *arg)
360{
361	int offset;
362	int isneg;
363
364	offset = 0;
365	isneg = *arg == '-';
366	if (isneg)
367		arg++;
368	switch (strlen(arg)) {
369	default:				/* invalid */
370		errx(1, "Invalid offset spec, must be [-][[HH]MM]SS");
371
372	case 6:					/* HHMMSS */
373		offset = ATOI2(arg);
374		/* FALLTHROUGH */
375	case 4:					/* MMSS */
376		offset = offset * 60 + ATOI2(arg);
377		/* FALLTHROUGH */
378	case 2:					/* SS */
379		offset = offset * 60 + ATOI2(arg);
380	}
381	if (isneg)
382		return (-offset);
383	else
384		return (offset);
385}
386
387static void
388stime_file(const char *fname, struct timespec *tsp)
389{
390	struct stat sb;
391
392	if (stat(fname, &sb))
393		err(1, "%s", fname);
394	tsp[0] = sb.st_atim;
395	tsp[1] = sb.st_mtim;
396}
397
398static void
399usage(const char *myname)
400{
401	fprintf(stderr, "usage: %s [-A [-][[hh]mm]SS] [-achm] [-r file] "
402		"[-t [[CC]YY]MMDDhhmm[.SS]]\n"
403		"       [-d YYYY-MM-DDThh:mm:SS[.frac][tz]] "
404		"file ...\n", myname);
405	exit(1);
406}
407