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- /* touch -- change modification and access times of files
- Copyright (C) 87, 89, 90, 91, 95, 1996 Free Software Foundation Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-
- /* Options:
- -a, --time={atime,access,use} Change access time only.
- -c, --no-create Do not create files that do not exist.
- -d, --date=TIME Specify time and date in various formats.
- -f Ignored.
- -m, --time={mtime,modify} Change modification time only.
- -r, --reference=FILE Use the time and date of reference file FILE.
- -t TIME Specify time and date in the form
- `MMDDhhmm[[CC]YY][.ss]'.
-
- If no options are given, -am is the default, using the current time.
- The -r, -t, and -d options are mutually exclusive. If a file does not
- exist, create it unless -c is given.
-
- Written by Paul Rubin, Arnold Robbins, Jim Kingdon, David MacKenzie,
- and Randy Smith. */
-
- #include <config.h>
- #include <stdio.h>
- #include <getopt.h>
- #include <sys/types.h>
-
- #include "system.h"
- #include "error.h"
- #include "argmatch.h"
-
- #ifndef STDC_HEADERS
- time_t mktime ();
- time_t time ();
- #endif
-
- time_t get_date ();
- time_t posixtime ();
- int safe_read ();
- int full_write ();
- void invalid_arg ();
-
- #ifndef HAVE_UTIME_NULL
- static int utime_now ();
- #endif
-
- /* Bitmasks for `change_times'. */
- #define CH_ATIME 1
- #define CH_MTIME 2
-
- /* The name by which this program was run. */
- char *program_name;
-
- /* Which timestamps to change. */
- static int change_times;
-
- /* (-c) If nonzero, don't create if not already there. */
- static int no_create;
-
- /* (-d) If nonzero, date supplied on command line in get_date formats. */
- static int flexible_date;
-
- /* (-r) If nonzero, use times from a reference file. */
- static int use_ref;
-
- /* (-t) If nonzero, date supplied on command line in POSIX format. */
- static int posix_date;
-
- /* If nonzero, the only thing we have to do is change both the
- modification and access time to the current time, so we don't
- have to own the file, just be able to read and write it. */
- static int amtime_now;
-
- /* New time to use when setting time. */
- static time_t newtime;
-
- /* File to use for -r. */
- static char *ref_file;
-
- /* Info about the reference file. */
- static struct stat ref_stats;
-
- /* If nonzero, display usage information and exit. */
- static int show_help;
-
- /* If nonzero, print the version on standard output and exit. */
- static int show_version;
-
- static struct option const longopts[] =
- {
- {"time", required_argument, 0, 130},
- {"no-create", no_argument, 0, 'c'},
- {"date", required_argument, 0, 'd'},
- {"file", required_argument, 0, 'r'},
- {"reference", required_argument, 0, 'r'},
- {"help", no_argument, &show_help, 1},
- {"version", no_argument, &show_version, 1},
- {0, 0, 0, 0}
- };
-
- /* Valid arguments to the `--time' option. */
- static char const* const time_args[] =
- {
- "atime", "access", "use", "mtime", "modify", 0
- };
-
- /* The bits in `change_times' that those arguments set. */
- static int const time_masks[] =
- {
- CH_ATIME, CH_ATIME, CH_ATIME, CH_MTIME, CH_MTIME
- };
-
- /* Update the time of file FILE according to the options given.
- Return 0 if successful, 1 if an error occurs. */
-
- static int
- touch (char *file)
- {
- int status;
- struct stat sbuf;
- int fd;
-
- if (stat (file, &sbuf))
- {
- if (errno != ENOENT)
- {
- error (0, errno, "%s", file);
- return 1;
- }
- if (no_create)
- return 0;
- fd = creat (file, 0666);
- if (fd == -1)
- {
- error (0, errno, "%s", file);
- return 1;
- }
- if (amtime_now)
- {
- if (close (fd) < 0)
- {
- error (0, errno, "%s", file);
- return 1;
- }
- return 0; /* We've done all we have to. */
- }
- if (fstat (fd, &sbuf))
- {
- error (0, errno, "%s", file);
- close (fd);
- return 1;
- }
- if (close (fd) < 0)
- {
- error (0, errno, "%s", file);
- return 1;
- }
- }
-
- if (amtime_now)
- {
- #ifndef HAVE_UTIME_NULL
- status = utime_now (file, sbuf.st_size);
- #else
- /* Pass NULL to utime so it will not fail if we just have
- write access to the file, but don't own it. */
- status = utime (file, NULL);
- #endif
- }
- else
- {
- struct utimbuf utb;
-
- if (use_ref)
- {
- utb.actime = ref_stats.st_atime;
- utb.modtime = ref_stats.st_mtime;
- }
- else
- utb.actime = utb.modtime = newtime;
-
- if (!(change_times & CH_ATIME))
- utb.actime = sbuf.st_atime;
-
- if (!(change_times & CH_MTIME))
- utb.modtime = sbuf.st_mtime;
-
- status = utime (file, &utb);
- }
-
- if (status)
- {
- error (0, errno, "%s", file);
- return 1;
- }
-
- return 0;
- }
-
- #ifndef HAVE_UTIME_NULL
- /* Emulate utime (file, NULL) for systems (like 4.3BSD) that do not
- interpret it to set the access and modification times of FILE to
- the current time. FILESIZE is the correct size of FILE, used to
- make sure empty files are not lengthened to 1 byte.
- Return 0 if successful, -1 if not. */
-
- static int
- utime_now (file, filesize)
- char *file;
- off_t filesize;
- {
- int fd;
- char c;
- int status = 0;
-
- fd = open (file, O_RDWR, 0666);
- if (fd < 0
- || safe_read (fd, &c, sizeof (char)) < 0
- || lseek (fd, (off_t) 0, SEEK_SET) < 0
- || full_write (fd, &c, sizeof (char)) < 0
- || ftruncate (fd, filesize) < 0
- || close (fd) < 0)
- status = -1;
- return status;
- }
- #endif
-
- static void
- usage (int status)
- {
- if (status != 0)
- fprintf (stderr, _("Try `%s --help' for more information.\n"),
- program_name);
- else
- {
- printf (_("Usage: %s [OPTION]... FILE...\n"), program_name);
- printf (_("\
- Update the access and modification times of each FILE to the current time.\n\
- \n\
- -a change only the access time\n\
- -c do not create any files\n\
- -d, --date=STRING parse STRING and use it instead of current time\n\
- -f (ignored)\n\
- -m change only the modification time\n\
- -r, --reference=FILE use this file's times instead of current time\n\
- -t STAMP use MMDDhhmm[[CC]YY][.ss] instead of current time\n\
- --time=WORD access -a, atime -a, mtime -m, modify -m, use -a\n\
- --help display this help and exit\n\
- --version output version information and exit\n\
- \n\
- STAMP may be used without -t if none of -drt, nor --, are used.\n"));
- }
- exit (status);
- }
-
- int
- main (int argc, char **argv)
- {
- int c, i;
- int date_set = 0;
- int err = 0;
-
- program_name = argv[0];
- setlocale (LC_ALL, "");
- bindtextdomain (PACKAGE, LOCALEDIR);
- textdomain (PACKAGE);
-
- change_times = no_create = use_ref = posix_date = flexible_date = 0;
- newtime = (time_t) -1;
-
- while ((c = getopt_long (argc, argv, "acd:fmr:t:", longopts, (int *) 0))
- != EOF)
- {
- switch (c)
- {
- case 0:
- break;
-
- case 'a':
- change_times |= CH_ATIME;
- break;
-
- case 'c':
- no_create++;
- break;
-
- case 'd':
- flexible_date++;
- newtime = get_date (optarg, NULL);
- if (newtime == (time_t) -1)
- error (1, 0, _("invalid date format `%s'"), optarg);
- date_set++;
- break;
-
- case 'f':
- break;
-
- case 'm':
- change_times |= CH_MTIME;
- break;
-
- case 'r':
- use_ref++;
- ref_file = optarg;
- break;
-
- case 't':
- posix_date++;
- newtime = posixtime (optarg);
- if (newtime == (time_t) -1)
- error (1, 0, _("invalid date format `%s'"), optarg);
- date_set++;
- break;
-
- case 130:
- i = argmatch (optarg, time_args);
- if (i < 0)
- {
- invalid_arg (_("time selector"), optarg, i);
- usage (1);
- }
- change_times |= time_masks[i];
- break;
-
- default:
- usage (1);
- }
- }
-
- if (show_version)
- {
- printf ("touch - %s\n", PACKAGE_VERSION);
- exit (0);
- }
-
- if (show_help)
- usage (0);
-
- if (change_times == 0)
- change_times = CH_ATIME | CH_MTIME;
-
- if ((use_ref && (posix_date || flexible_date))
- || (posix_date && flexible_date))
- {
- error (0, 0, _("cannot specify times from more than one source"));
- usage (1);
- }
-
- if (use_ref)
- {
- if (stat (ref_file, &ref_stats))
- error (1, errno, "%s", ref_file);
- date_set++;
- }
-
- if (!date_set && optind < argc && strcmp (argv[optind - 1], "--"))
- {
- newtime = posixtime (argv[optind]);
- if (newtime != (time_t) -1)
- {
- optind++;
- date_set++;
- }
- }
- if (!date_set)
- {
- if ((change_times & (CH_ATIME | CH_MTIME)) == (CH_ATIME | CH_MTIME))
- amtime_now = 1;
- else
- time (&newtime);
- }
-
- if (optind == argc)
- {
- error (0, 0, _("file arguments missing"));
- usage (1);
- }
-
- for (; optind < argc; ++optind)
- err += touch (argv[optind]);
-
- exit (err != 0);
- }
-