542 lines
12 KiB
C
542 lines
12 KiB
C
/* $NetBSD: touch.c,v 1.40 2024/02/10 00:19:30 kre Exp $ */
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/*
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)touch.c 8.2 (Berkeley) 4/28/95";
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#endif
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__RCSID("$NetBSD: touch.c,v 1.40 2024/02/10 00:19:30 kre Exp $");
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <locale.h>
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#include <time.h>
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#include <tzfile.h>
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#include <unistd.h>
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#include <util.h>
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#include <getopt.h>
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static void stime_arg0(const char *, struct timespec *);
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static void stime_arg1(char *, struct timespec *);
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static void stime_arg2(const char *, int, struct timespec *);
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static void stime_file(const char *, struct timespec *,
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int (const char *, struct stat *));
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static int stime_posix(const char *, struct timespec *);
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static int difftm(const struct tm *, const struct tm *);
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__dead static void usage(void);
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struct option touch_longopts[] = {
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{ "date", required_argument, 0,
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'd' },
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{ "reference", required_argument, 0,
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'r' },
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{ NULL, 0, 0,
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0 },
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};
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#define YEAR_BOUNDARY 69
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#define LOW_YEAR_CENTURY 2000 /* for 2 digit years < YEAR_BOUNDARY */
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#define HIGH_YEAR_CENTURY 1900 /* for 2 digit years >= " */
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#define NO_TIME ((time_t)-1) /* time_t might be unsigned */
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int
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main(int argc, char *argv[])
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{
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struct stat sb;
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struct timespec ts[2];
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int aflag, cflag, Dflag, hflag, mflag, ch, fd, len, rval, timeset;
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char *p;
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int (*change_file_times)(const char *, const struct timespec *);
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int (*get_file_status)(const char *, struct stat *);
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setlocale(LC_ALL, "");
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aflag = cflag = Dflag = hflag = mflag = timeset = 0;
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if (clock_gettime(CLOCK_REALTIME, &ts[0]))
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err(1, "clock_gettime");
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while ((ch = getopt_long(argc, argv, "acDd:fhmR:r:t:", touch_longopts,
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NULL)) != -1)
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switch (ch) {
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case 'a':
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aflag = 1;
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break;
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case 'c':
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cflag = 1;
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break;
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case 'D':
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Dflag = 1;
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break;
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case 'd':
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timeset = 1;
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if (!stime_posix(optarg, ts))
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stime_arg0(optarg, ts);
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break;
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case 'f':
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break;
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case 'h':
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hflag = 1;
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break;
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case 'm':
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mflag = 1;
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break;
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case 'R':
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timeset = 1;
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stime_file(optarg, ts, lstat);
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break;
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case 'r':
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timeset = 1;
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stime_file(optarg, ts, stat);
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break;
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case 't':
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timeset = 1;
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stime_arg1(optarg, ts);
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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/* Default is both -a and -m. */
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if (aflag == 0 && mflag == 0)
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aflag = mflag = 1;
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if (hflag) {
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cflag = 1; /* Don't create new file */
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change_file_times = lutimens;
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get_file_status = lstat;
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} else {
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change_file_times = utimens;
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get_file_status = stat;
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}
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/*
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* If no -r or -t flag, at least two operands, the first of which
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* is an 8 or 10 digit number, use the obsolete time specification.
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*/
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if (!timeset && argc > 1) {
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(void)strtol(argv[0], &p, 10);
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len = p - argv[0];
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if (*p == '\0' && (len == 8 || len == 10)) {
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timeset = 1;
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stime_arg2(*argv++, len == 10, ts);
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}
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}
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/* Otherwise use the current time of day. */
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if (!timeset)
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ts[1] = ts[0];
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if (*argv == NULL)
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usage();
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for (rval = EXIT_SUCCESS; *argv; ++argv) {
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/* See if the file exists. */
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if ((*get_file_status)(*argv, &sb)) {
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if (!cflag) {
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/* Create the file. */
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fd = open(*argv,
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O_WRONLY | O_CREAT, DEFFILEMODE);
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if (fd == -1 || fstat(fd, &sb) || close(fd)) {
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rval = EXIT_FAILURE;
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warn("%s", *argv);
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continue;
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}
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/* If using the current time, we're done. */
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if (!timeset)
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continue;
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} else
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continue;
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}
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if (!aflag)
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ts[0] = sb.st_atimespec;
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if (!mflag)
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ts[1] = sb.st_mtimespec;
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if (Dflag &&
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timespeccmp(&ts[0], &sb.st_atimespec, ==) &&
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timespeccmp(&ts[1], &sb.st_mtimespec, ==))
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continue;
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/* Try utimes(2). */
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if (!(*change_file_times)(*argv, ts))
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continue;
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/* If the user specified a time, nothing else we can do. */
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if (timeset) {
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rval = EXIT_FAILURE;
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warn("%s", *argv);
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}
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/*
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* System V and POSIX 1003.1 require that a NULL argument
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* set the access/modification times to the current time.
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* The permission checks are different, too, in that the
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* ability to write the file is sufficient. Take a shot.
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*/
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if (!(*change_file_times)(*argv, NULL))
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continue;
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rval = EXIT_FAILURE;
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warn("%s", *argv);
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}
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exit(rval);
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}
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#define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
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static void
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stime_arg0(const char *arg, struct timespec *tsp)
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{
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tsp[1].tv_sec = tsp[0].tv_sec = parsedate(arg, NULL, NULL);
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if (tsp[0].tv_sec == NO_TIME)
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errx(EXIT_FAILURE, "Could not parse `%s'", arg);
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tsp[0].tv_nsec = tsp[1].tv_nsec = 0;
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}
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static void
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stime_arg1(char *arg, struct timespec *tsp)
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{
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struct tm *t, tm;
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time_t tmptime;
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int yearset;
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char *p;
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char *initarg = arg;
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/* Start with the current time. */
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tmptime = tsp[0].tv_sec;
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if ((t = localtime(&tmptime)) == NULL)
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err(EXIT_FAILURE, "localtime");
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/* [[CC]YY]MMDDhhmm[.ss] */
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if ((p = strchr(arg, '.')) == NULL)
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t->tm_sec = 0; /* Seconds defaults to 0. */
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else {
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if (strlen(p + 1) != 2)
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goto terr;
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*p++ = '\0';
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t->tm_sec = ATOI2(p);
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}
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yearset = 0;
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switch (strlen(arg)) {
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case 12: /* CCYYMMDDhhmm */
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t->tm_year = ATOI2(arg) * 100 - TM_YEAR_BASE;
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yearset = 1;
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/* FALLTHROUGH */
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case 10: /* YYMMDDhhmm */
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if (yearset) {
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t->tm_year += ATOI2(arg);
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} else {
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yearset = ATOI2(arg);
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if (yearset < YEAR_BOUNDARY)
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t->tm_year = yearset +
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LOW_YEAR_CENTURY - TM_YEAR_BASE;
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else
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t->tm_year = yearset +
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HIGH_YEAR_CENTURY - TM_YEAR_BASE;
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}
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/* FALLTHROUGH */
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case 8: /* MMDDhhmm */
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t->tm_mon = ATOI2(arg);
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--t->tm_mon; /* Convert from 01-12 to 00-11 */
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/* FALLTHROUGH */
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case 6:
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t->tm_mday = ATOI2(arg);
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/* FALLTHROUGH */
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case 4:
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t->tm_hour = ATOI2(arg);
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/* FALLTHROUGH */
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case 2:
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t->tm_min = ATOI2(arg);
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break;
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default:
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goto terr;
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}
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t->tm_isdst = -1; /* Figure out DST. */
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tm = *t;
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tsp[0].tv_sec = tsp[1].tv_sec = mktime(t);
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if (tsp[0].tv_sec == NO_TIME || difftm(t, &tm))
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terr: errx(EXIT_FAILURE, "out of range or bad time specification:\n"
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"\t'%s' should be [[CC]YY]MMDDhhmm[.ss]", initarg);
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tsp[0].tv_nsec = tsp[1].tv_nsec = 0;
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}
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static void
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stime_arg2(const char *arg, int year, struct timespec *tsp)
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{
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struct tm *t, tm;
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time_t tmptime;
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/* Start with the current time. */
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tmptime = tsp[0].tv_sec;
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if ((t = localtime(&tmptime)) == NULL)
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err(EXIT_FAILURE, "localtime");
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t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */
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--t->tm_mon; /* Convert from 01-12 to 00-11 */
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t->tm_mday = ATOI2(arg);
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t->tm_hour = ATOI2(arg);
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t->tm_min = ATOI2(arg);
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if (year) {
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year = ATOI2(arg);
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if (year < YEAR_BOUNDARY)
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t->tm_year = year + LOW_YEAR_CENTURY - TM_YEAR_BASE;
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else
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t->tm_year = year + HIGH_YEAR_CENTURY - TM_YEAR_BASE;
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}
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t->tm_sec = 0;
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t->tm_isdst = -1; /* Figure out DST. */
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tm = *t;
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tsp[0].tv_sec = tsp[1].tv_sec = mktime(t);
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if (tsp[0].tv_sec == NO_TIME || difftm(t, &tm))
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errx(EXIT_FAILURE,
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"out of range or bad time specification: MMDDhhmm[YY]");
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tsp[0].tv_nsec = tsp[1].tv_nsec = 0;
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}
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static void
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stime_file(const char *fname, struct timespec *tsp,
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int statfunc(const char *, struct stat *))
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{
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struct stat sb;
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if (statfunc(fname, &sb))
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err(1, "%s", fname);
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tsp[0] = sb.st_atimespec;
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tsp[1] = sb.st_mtimespec;
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}
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static int
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stime_posix(const char *arg, struct timespec *tsp)
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{
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struct tm tm, tms;
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const char *p;
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char *ep;
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int utc = 0;
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long val;
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#define isdigch(c) (isdigit((int)((unsigned char)(c))))
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if ((p = strchr(arg, '-')) == NULL)
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return 0;
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if (p - arg < 4) /* at least 4 year digits required */
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return 0;
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if (!isdigch(arg[0])) /* and the first must be a digit! */
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return 0;
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(void)memset(&tm, 0, sizeof tm);
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errno = 0;
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val = strtol(arg, &ep, 10); /* YYYY */
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if (val < 0 || val > INT_MAX)
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return 0;
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if (*ep != '-')
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return 0;
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tm.tm_year = (int)val - 1900;
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p = ep + 1;
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if (!isdigch(*p))
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return 0;
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val = strtol(p, &ep, 10); /* MM */
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if (val < 1 || val > 12)
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return 0;
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if (*ep != '-' || ep != p + 2)
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return 0;
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tm.tm_mon = (int)val - 1;
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p = ep + 1;
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if (!isdigch(*p))
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return 0;
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val = strtol(p, &ep, 10); /* DD */
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if (val < 1 || val > 31)
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return 0;
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if ((*ep != 'T' && *ep != ' ') || ep != p + 2)
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return 0;
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tm.tm_mday = (int)val;
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p = ep + 1;
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if (!isdigch(*p))
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return 0;
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val = strtol(p, &ep, 10); /* hh */
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if (val < 0 || val > 23)
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return 0;
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if (*ep != ':' || ep != p + 2)
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return 0;
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tm.tm_hour = (int)val;
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p = ep + 1;
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if (!isdigch(*p))
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return 0;
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val = strtol(p, &ep, 10); /* mm */
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if (val < 0 || val > 59)
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return 0;
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if (*ep != ':' || ep != p + 2)
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return 0;
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tm.tm_min = (int)val;
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p = ep + 1;
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if (!isdigch(*p))
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return 0;
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val = strtol(p, &ep, 10); /* ss (or in POSIX, SS) */
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if (val < 0 || val > 60)
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return 0;
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if ((*ep != '.' && *ep != ',' && *ep != 'Z' && *ep != '\0') ||
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ep != p + 2)
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return 0;
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tm.tm_sec = (int)val;
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if (*ep == ',' || *ep == '.') {
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double frac;
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ptrdiff_t fdigs;
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p = ep + 1;
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if (!isdigch(*p))
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return 0;
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val = strtol(p, &ep, 10);
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if (val < 0)
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return 0;
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if (ep == p) /* at least 1 digit required */
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return 0;
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if (*ep != 'Z' && *ep != '\0')
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return 0;
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if (errno != 0)
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return 0;
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fdigs = ep - p;
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if (fdigs > 15) {
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/* avoid being absurd */
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/* don't want to risk 10^fdigs being INF */
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if (val == 0)
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fdigs = 1;
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else while (fdigs > 15) {
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val = (val + 5) / 10;
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fdigs--;
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}
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}
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frac = pow(10.0, (double)fdigs);
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tsp[0].tv_nsec = tsp[1].tv_nsec =
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(long)round(((double)val / frac) * 1000000000.0);
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} else
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tsp[0].tv_nsec = tsp[1].tv_nsec = 0;
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if (*ep == 'Z') {
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if (ep[1] != '\0')
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return 0;
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utc = 1;
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}
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if (errno != 0)
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return 0;
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tm.tm_isdst = -1;
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tms = tm;
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if (utc)
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tsp[0].tv_sec = tsp[1].tv_sec = timegm(&tm);
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else
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tsp[0].tv_sec = tsp[1].tv_sec = mktime(&tm);
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if ((errno != 0 && tsp[1].tv_sec == NO_TIME) || difftm(&tm, &tms))
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return 0;
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return 1;
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}
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/*
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* Determine whether 2 struct tn's are different
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* return true (1) if theu are, false (0) otherwise.
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*
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* Note that we only consider the fields that are set
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* for mktime() to use - if mktime() returns them
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* differently than was set, then there was a problem
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* with the setting.
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*/
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static int
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difftm(const struct tm *t1, const struct tm *t2)
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{
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#define CHK(fld) do { \
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if (t1->tm_##fld != t2->tm_##fld) { \
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return 1; \
|
|
} \
|
|
} while(/*CONSTCOND*/0)
|
|
|
|
CHK(year);
|
|
CHK(mon);
|
|
CHK(mday);
|
|
CHK(hour);
|
|
CHK(min);
|
|
CHK(sec);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr,
|
|
"Usage: %s [-acDfhm] [-d|--date datetime] [-R|-r|--reference file]"
|
|
" [-t time] file ...\n", getprogname());
|
|
exit(EXIT_FAILURE);
|
|
}
|