376 lines
8.8 KiB
C
376 lines
8.8 KiB
C
/* $NetBSD: touch.c,v 1.27 2008/07/21 14:19:27 lukem 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 1.27 2008/07/21 14:19:27 lukem 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 <err.h>
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#include <errno.h>
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#include <fcntl.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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int main __P((int, char **));
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int rw __P((char *, struct stat *, int));
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void stime_arg1 __P((char *, struct timeval *));
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void stime_arg2 __P((char *, int, struct timeval *));
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void stime_file __P((char *, struct timeval *));
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void usage __P((void));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct stat sb;
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struct timeval tv[2];
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int aflag, cflag, fflag, hflag, mflag, ch, fd, len, rval, timeset;
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char *p;
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int (*change_file_times) __P((const char *, const struct timeval *));
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int (*get_file_status) __P((const char *, struct stat *));
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setlocale(LC_ALL, "");
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aflag = cflag = fflag = hflag = mflag = timeset = 0;
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if (gettimeofday(&tv[0], NULL))
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err(1, "gettimeofday");
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while ((ch = getopt(argc, argv, "acfhmr:t:")) != -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 'f':
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fflag = 1;
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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, tv);
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break;
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case 't':
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timeset = 1;
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stime_arg1(optarg, tv);
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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 = lutimes;
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get_file_status = lstat;
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} else {
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change_file_times = utimes;
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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, tv);
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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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tv[1] = tv[0];
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if (*argv == NULL)
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usage();
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for (rval = 0; *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 = 1;
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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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TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec);
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if (!mflag)
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TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);
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/* Try utimes(2). */
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if (!(*change_file_times)(*argv, tv))
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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 = 1;
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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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/* Try reading/writing. */
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if (!S_ISLNK(sb.st_mode) && rw(*argv, &sb, fflag))
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rval = 1;
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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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void
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stime_arg1(arg, tvp)
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char *arg;
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struct timeval *tvp;
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{
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struct tm *t;
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time_t tmptime;
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int yearset;
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char *p;
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/* Start with the current time. */
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tmptime = tvp[0].tv_sec;
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if ((t = localtime(&tmptime)) == NULL)
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err(1, "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 < 69)
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t->tm_year = yearset + 2000 - TM_YEAR_BASE;
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else
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t->tm_year = yearset + 1900 - 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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tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
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if (tvp[0].tv_sec == -1)
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terr: errx(1,
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"out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
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tvp[0].tv_usec = tvp[1].tv_usec = 0;
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}
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void
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stime_arg2(arg, year, tvp)
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char *arg;
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int year;
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struct timeval *tvp;
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{
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struct tm *t;
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time_t tmptime;
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/* Start with the current time. */
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tmptime = tvp[0].tv_sec;
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if ((t = localtime(&tmptime)) == NULL)
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err(1, "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 < 69)
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t->tm_year = year + 2000 - TM_YEAR_BASE;
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else
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t->tm_year = year + 1900 - 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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tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
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if (tvp[0].tv_sec == -1)
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errx(1,
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"out of range or illegal time specification: MMDDhhmm[yy]");
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tvp[0].tv_usec = tvp[1].tv_usec = 0;
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}
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void
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stime_file(fname, tvp)
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char *fname;
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struct timeval *tvp;
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{
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struct stat sb;
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if (stat(fname, &sb))
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err(1, "%s", fname);
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TIMESPEC_TO_TIMEVAL(&tvp[0], &sb.st_atimespec);
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TIMESPEC_TO_TIMEVAL(&tvp[1], &sb.st_mtimespec);
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}
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int
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rw(fname, sbp, force)
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char *fname;
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struct stat *sbp;
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int force;
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{
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int fd, needed_chmod, rval;
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u_char byte;
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/* Try regular files and directories. */
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if (!S_ISREG(sbp->st_mode) && !S_ISDIR(sbp->st_mode)) {
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warnx("%s: %s", fname, strerror(EFTYPE));
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return (1);
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}
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needed_chmod = rval = 0;
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if ((fd = open(fname, O_RDWR, 0)) == -1) {
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if (!force || chmod(fname, DEFFILEMODE))
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goto err;
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if ((fd = open(fname, O_RDWR, 0)) == -1)
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goto err;
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needed_chmod = 1;
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}
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if (sbp->st_size != 0) {
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if (read(fd, &byte, sizeof(byte)) != sizeof(byte))
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goto err;
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if (lseek(fd, (off_t)0, SEEK_SET) == -1)
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goto err;
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if (write(fd, &byte, sizeof(byte)) != sizeof(byte))
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goto err;
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} else {
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if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) {
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err: rval = 1;
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warn("%s", fname);
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} else if (ftruncate(fd, (off_t)0)) {
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rval = 1;
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warn("%s: file modified", fname);
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}
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}
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if (fd >= 0 && close(fd) && rval != 1) {
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rval = 1;
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warn("%s", fname);
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}
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if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) {
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rval = 1;
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warn("%s: permissions modified", fname);
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}
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return (rval);
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}
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__dead void
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usage()
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{
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(void)fprintf(stderr,
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"usage: touch [-acfhm] [-r file] [-t time] file ...\n");
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exit(1);
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}
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