1/*	$NetBSD: touch.c,v 1.40 2024/02/10 00:19:30 kre Exp $	*/
2
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 * 3. 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#ifndef lint
34__COPYRIGHT("@(#) Copyright (c) 1993\
35 The Regents of the University of California.  All rights reserved.");
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)touch.c	8.2 (Berkeley) 4/28/95";
41#endif
42__RCSID("$NetBSD: touch.c,v 1.40 2024/02/10 00:19:30 kre Exp $");
43#endif /* not lint */
44
45#include <sys/types.h>
46#include <sys/stat.h>
47#include <sys/time.h>
48
49#include <ctype.h>
50#include <err.h>
51#include <errno.h>
52#include <fcntl.h>
53#include <limits.h>
54#include <math.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <locale.h>
59#include <time.h>
60#include <tzfile.h>
61#include <unistd.h>
62#include <util.h>
63#include <getopt.h>
64
65static void	stime_arg0(const char *, struct timespec *);
66static void	stime_arg1(char *, struct timespec *);
67static void	stime_arg2(const char *, int, struct timespec *);
68static void	stime_file(const char *, struct timespec *,
69		   int (const char *, struct stat *));
70static int	stime_posix(const char *, struct timespec *);
71static int	difftm(const struct tm *, const struct tm *);
72__dead static void	usage(void);
73
74struct option touch_longopts[] = {
75	{ "date",		required_argument,	0,
76						'd' },
77	{ "reference",		required_argument,	0,
78						'r' },
79	{ NULL,			0,			0,
80						0 },
81};
82
83#define	YEAR_BOUNDARY		69
84#define	LOW_YEAR_CENTURY	2000	/* for 2 digit years < YEAR_BOUNDARY */
85#define	HIGH_YEAR_CENTURY	1900	/* for 2 digit years >=  "  */
86
87#define	NO_TIME		((time_t)-1)	/* time_t might be unsigned */
88
89int
90main(int argc, char *argv[])
91{
92	struct stat sb;
93	struct timespec ts[2];
94	int aflag, cflag, Dflag, hflag, mflag, ch, fd, len, rval, timeset;
95	char *p;
96	int (*change_file_times)(const char *, const struct timespec *);
97	int (*get_file_status)(const char *, struct stat *);
98
99	setlocale(LC_ALL, "");
100
101	aflag = cflag = Dflag = hflag = mflag = timeset = 0;
102	if (clock_gettime(CLOCK_REALTIME, &ts[0]))
103		err(1, "clock_gettime");
104
105	while ((ch = getopt_long(argc, argv, "acDd:fhmR:r:t:", touch_longopts,
106	    NULL)) != -1)
107		switch (ch) {
108		case 'a':
109			aflag = 1;
110			break;
111		case 'c':
112			cflag = 1;
113			break;
114		case 'D':
115			Dflag = 1;
116			break;
117		case 'd':
118			timeset = 1;
119			if (!stime_posix(optarg, ts))
120				stime_arg0(optarg, ts);
121			break;
122		case 'f':
123			break;
124		case 'h':
125			hflag = 1;
126			break;
127		case 'm':
128			mflag = 1;
129			break;
130		case 'R':
131			timeset = 1;
132			stime_file(optarg, ts, lstat);
133			break;
134		case 'r':
135			timeset = 1;
136			stime_file(optarg, ts, stat);
137			break;
138		case 't':
139			timeset = 1;
140			stime_arg1(optarg, ts);
141			break;
142		case '?':
143		default:
144			usage();
145		}
146	argc -= optind;
147	argv += optind;
148
149	/* Default is both -a and -m. */
150	if (aflag == 0 && mflag == 0)
151		aflag = mflag = 1;
152
153	if (hflag) {
154		cflag = 1;		/* Don't create new file */
155		change_file_times = lutimens;
156		get_file_status = lstat;
157	} else {
158		change_file_times = utimens;
159		get_file_status = stat;
160	}
161
162	/*
163	 * If no -r or -t flag, at least two operands, the first of which
164	 * is an 8 or 10 digit number, use the obsolete time specification.
165	 */
166	if (!timeset && argc > 1) {
167		(void)strtol(argv[0], &p, 10);
168		len = p - argv[0];
169		if (*p == '\0' && (len == 8 || len == 10)) {
170			timeset = 1;
171			stime_arg2(*argv++, len == 10, ts);
172		}
173	}
174
175	/* Otherwise use the current time of day. */
176	if (!timeset)
177		ts[1] = ts[0];
178
179	if (*argv == NULL)
180		usage();
181
182	for (rval = EXIT_SUCCESS; *argv; ++argv) {
183		/* See if the file exists. */
184		if ((*get_file_status)(*argv, &sb)) {
185			if (!cflag) {
186				/* Create the file. */
187				fd = open(*argv,
188				    O_WRONLY | O_CREAT, DEFFILEMODE);
189				if (fd == -1 || fstat(fd, &sb) || close(fd)) {
190					rval = EXIT_FAILURE;
191					warn("%s", *argv);
192					continue;
193				}
194
195				/* If using the current time, we're done. */
196				if (!timeset)
197					continue;
198			} else
199				continue;
200		}
201		if (!aflag)
202			ts[0] = sb.st_atimespec;
203		if (!mflag)
204			ts[1] = sb.st_mtimespec;
205
206		if (Dflag &&
207		    timespeccmp(&ts[0], &sb.st_atimespec, ==) &&
208		    timespeccmp(&ts[1], &sb.st_mtimespec, ==))
209			continue;
210
211		/* Try utimes(2). */
212		if (!(*change_file_times)(*argv, ts))
213			continue;
214
215		/* If the user specified a time, nothing else we can do. */
216		if (timeset) {
217			rval = EXIT_FAILURE;
218			warn("%s", *argv);
219		}
220
221		/*
222		 * System V and POSIX 1003.1 require that a NULL argument
223		 * set the access/modification times to the current time.
224		 * The permission checks are different, too, in that the
225		 * ability to write the file is sufficient.  Take a shot.
226		 */
227		 if (!(*change_file_times)(*argv, NULL))
228			continue;
229
230		rval = EXIT_FAILURE;
231		warn("%s", *argv);
232	}
233	exit(rval);
234}
235
236#define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
237
238static void
239stime_arg0(const char *arg, struct timespec *tsp)
240{
241	tsp[1].tv_sec = tsp[0].tv_sec = parsedate(arg, NULL, NULL);
242	if (tsp[0].tv_sec == NO_TIME)
243		errx(EXIT_FAILURE, "Could not parse `%s'", arg);
244	tsp[0].tv_nsec = tsp[1].tv_nsec = 0;
245}
246
247static void
248stime_arg1(char *arg, struct timespec *tsp)
249{
250	struct tm *t, tm;
251	time_t tmptime;
252	int yearset;
253	char *p;
254	char *initarg = arg;
255
256					/* Start with the current time. */
257	tmptime = tsp[0].tv_sec;
258	if ((t = localtime(&tmptime)) == NULL)
259		err(EXIT_FAILURE, "localtime");
260					/* [[CC]YY]MMDDhhmm[.ss] */
261	if ((p = strchr(arg, '.')) == NULL)
262		t->tm_sec = 0;		/* Seconds defaults to 0. */
263	else {
264		if (strlen(p + 1) != 2)
265			goto terr;
266		*p++ = '\0';
267		t->tm_sec = ATOI2(p);
268	}
269
270	yearset = 0;
271	switch (strlen(arg)) {
272	case 12:			/* CCYYMMDDhhmm */
273		t->tm_year = ATOI2(arg) * 100 - TM_YEAR_BASE;
274		yearset = 1;
275		/* FALLTHROUGH */
276	case 10:			/* YYMMDDhhmm */
277		if (yearset) {
278			t->tm_year += ATOI2(arg);
279		} else {
280			yearset = ATOI2(arg);
281			if (yearset < YEAR_BOUNDARY)
282				t->tm_year = yearset +
283				    LOW_YEAR_CENTURY - TM_YEAR_BASE;
284			else
285				t->tm_year = yearset +
286				    HIGH_YEAR_CENTURY - TM_YEAR_BASE;
287		}
288		/* FALLTHROUGH */
289	case 8:				/* MMDDhhmm */
290		t->tm_mon = ATOI2(arg);
291		--t->tm_mon;		/* Convert from 01-12 to 00-11 */
292		/* FALLTHROUGH */
293	case 6:
294		t->tm_mday = ATOI2(arg);
295		/* FALLTHROUGH */
296	case 4:
297		t->tm_hour = ATOI2(arg);
298		/* FALLTHROUGH */
299	case 2:
300		t->tm_min = ATOI2(arg);
301		break;
302	default:
303		goto terr;
304	}
305
306	t->tm_isdst = -1;		/* Figure out DST. */
307	tm = *t;
308	tsp[0].tv_sec = tsp[1].tv_sec = mktime(t);
309	if (tsp[0].tv_sec == NO_TIME || difftm(t, &tm))
310 terr:		errx(EXIT_FAILURE, "out of range or bad time specification:\n"
311		    "\t'%s' should be [[CC]YY]MMDDhhmm[.ss]", initarg);
312
313	tsp[0].tv_nsec = tsp[1].tv_nsec = 0;
314}
315
316static void
317stime_arg2(const char *arg, int year, struct timespec *tsp)
318{
319	struct tm *t, tm;
320	time_t tmptime;
321					/* Start with the current time. */
322	tmptime = tsp[0].tv_sec;
323	if ((t = localtime(&tmptime)) == NULL)
324		err(EXIT_FAILURE, "localtime");
325
326	t->tm_mon = ATOI2(arg);		/* MMDDhhmm[yy] */
327	--t->tm_mon;			/* Convert from 01-12 to 00-11 */
328	t->tm_mday = ATOI2(arg);
329	t->tm_hour = ATOI2(arg);
330	t->tm_min = ATOI2(arg);
331	if (year) {
332		year = ATOI2(arg);
333		if (year < YEAR_BOUNDARY)
334			t->tm_year = year + LOW_YEAR_CENTURY - TM_YEAR_BASE;
335		else
336			t->tm_year = year + HIGH_YEAR_CENTURY - TM_YEAR_BASE;
337	}
338	t->tm_sec = 0;
339
340	t->tm_isdst = -1;		/* Figure out DST. */
341	tm = *t;
342	tsp[0].tv_sec = tsp[1].tv_sec = mktime(t);
343	if (tsp[0].tv_sec == NO_TIME || difftm(t, &tm))
344		errx(EXIT_FAILURE,
345		    "out of range or bad time specification: MMDDhhmm[YY]");
346
347	tsp[0].tv_nsec = tsp[1].tv_nsec = 0;
348}
349
350static void
351stime_file(const char *fname, struct timespec *tsp,
352    int statfunc(const char *, struct stat *))
353{
354	struct stat sb;
355
356	if (statfunc(fname, &sb))
357		err(1, "%s", fname);
358	tsp[0] = sb.st_atimespec;
359	tsp[1] = sb.st_mtimespec;
360}
361
362static int
363stime_posix(const char *arg, struct timespec *tsp)
364{
365	struct tm tm, tms;
366	const char *p;
367	char *ep;
368	int utc = 0;
369	long val;
370
371#define	isdigch(c)	(isdigit((int)((unsigned char)(c))))
372
373	if ((p = strchr(arg, '-')) == NULL)
374		return 0;
375	if (p - arg < 4)	/* at least 4 year digits required */
376		return 0;
377
378	if (!isdigch(arg[0]))	/* and the first must be a digit! */
379		return 0;
380
381	(void)memset(&tm, 0, sizeof tm);
382
383	errno = 0;
384	val = strtol(arg, &ep, 10);		/* YYYY */
385	if (val < 0 || val > INT_MAX)
386		return 0;
387	if (*ep != '-')
388		return 0;
389	tm.tm_year = (int)val - 1900;
390
391	p = ep + 1;
392
393	if (!isdigch(*p))
394		return 0;
395	val = strtol(p, &ep, 10);		/* MM */
396	if (val < 1 || val > 12)
397		return 0;
398	if (*ep != '-' || ep != p + 2)
399		return 0;
400	tm.tm_mon = (int)val - 1;
401
402	p = ep + 1;
403
404	if (!isdigch(*p))
405		return 0;
406	val = strtol(p, &ep, 10);		/* DD */
407	if (val < 1 || val > 31)
408		return 0;
409	if ((*ep != 'T' && *ep != ' ') || ep != p + 2)
410		return 0;
411	tm.tm_mday = (int)val;
412
413	p = ep + 1;
414
415	if (!isdigch(*p))
416		return 0;
417	val = strtol(p, &ep, 10);		/* hh */
418	if (val < 0 || val > 23)
419		return 0;
420	if (*ep != ':' || ep != p + 2)
421		return 0;
422	tm.tm_hour = (int)val;
423
424	p = ep + 1;
425
426	if (!isdigch(*p))
427		return 0;
428	val = strtol(p, &ep, 10);		/* mm */
429	if (val < 0 || val > 59)
430		return 0;
431	if (*ep != ':' || ep != p + 2)
432		return 0;
433	tm.tm_min = (int)val;
434
435	p = ep + 1;
436
437	if (!isdigch(*p))
438		return 0;
439	val = strtol(p, &ep, 10);		/* ss (or in POSIX, SS) */
440	if (val < 0 || val > 60)
441		return 0;
442	if ((*ep != '.' && *ep != ',' && *ep != 'Z' && *ep != '\0') ||
443	      ep != p + 2)
444		return 0;
445	tm.tm_sec = (int)val;
446
447	if (*ep == ',' || *ep == '.') {
448		double frac;
449		ptrdiff_t fdigs;
450
451		p = ep + 1;
452		if (!isdigch(*p))
453			return 0;
454		val = strtol(p, &ep, 10);
455		if (val < 0)
456			return 0;
457		if (ep == p)	/* at least 1 digit required */
458			return 0;
459		if (*ep != 'Z' && *ep != '\0')
460			return 0;
461
462		if (errno != 0)
463			return 0;
464
465		fdigs = ep - p;
466		if (fdigs > 15) {
467			/* avoid being absurd */
468			/* don't want to risk 10^fdigs being INF */
469			if (val == 0)
470				fdigs = 1;
471			else while (fdigs > 15) {
472				val = (val + 5) / 10;
473				fdigs--;
474			}
475		}
476
477		frac = pow(10.0, (double)fdigs);
478
479		tsp[0].tv_nsec = tsp[1].tv_nsec =
480			(long)round(((double)val / frac) * 1000000000.0);
481	} else
482		tsp[0].tv_nsec = tsp[1].tv_nsec = 0;
483
484	if (*ep == 'Z') {
485		if (ep[1] != '\0')
486			return 0;
487		utc = 1;
488	}
489
490	if (errno != 0)
491		return 0;
492
493	tm.tm_isdst = -1;
494	tms = tm;
495	if (utc)
496		tsp[0].tv_sec = tsp[1].tv_sec = timegm(&tm);
497	else
498		tsp[0].tv_sec = tsp[1].tv_sec = mktime(&tm);
499
500	if ((errno != 0 && tsp[1].tv_sec == NO_TIME) || difftm(&tm, &tms))
501		return 0;
502
503	return 1;
504}
505
506/*
507 * Determine whether 2 struct tn's are different
508 * return true (1) if theu are, false (0) otherwise.
509 *
510 * Note that we only consider the fields that are set
511 * for mktime() to use - if mktime() returns them
512 * differently than was set, then there was a problem
513 * with the setting.
514 */
515static int
516difftm(const struct tm *t1, const struct tm *t2)
517{
518#define CHK(fld) do {						\
519			if (t1->tm_##fld != t2->tm_##fld) {	\
520				return  1;			\
521			}					\
522		} while(/*CONSTCOND*/0)
523
524	CHK(year);
525	CHK(mon);
526	CHK(mday);
527	CHK(hour);
528	CHK(min);
529	CHK(sec);
530
531	return 0;
532}
533
534static void
535usage(void)
536{
537	(void)fprintf(stderr,
538	    "Usage: %s [-acDfhm] [-d|--date datetime] [-R|-r|--reference file]"
539	    " [-t time] file ...\n", getprogname());
540	exit(EXIT_FAILURE);
541}
542