/* touch -- change modification and access times of files Copyright (C) 1987, 1989, 1990, 1991, 1995 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., 675 Mass Ave, Cambridge, MA 02139, 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 #include #include #include #include "system.h" #include "version.h" #include "error.h" #ifndef STDC_HEADERS time_t mktime (); time_t time (); #endif int argmatch (); time_t get_date (); time_t posixtime (); int safe_read (); int full_write (); void invalid_arg (); static int touch (char *file); static void usage (int status); #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 non-zero, display usage information and exit. */ static int show_help; /* If non-zero, 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 }; void main (int argc, char **argv) { int c, i; int date_set = 0; int err = 0; program_name = argv[0]; 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", version_string); 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); } /* 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\ --help display this help and exit\n\ --time=WORD access -a, atime -a, mtime -m, modify -m, use -a\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); }