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NetBSD/usr.bin/touch/touch.c

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/* $NetBSD: touch.c,v 1.32 2012/10/22 21:51:58 christos Exp $ */
/*
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)touch.c 8.2 (Berkeley) 4/28/95";
#endif
__RCSID("$NetBSD: touch.c,v 1.32 2012/10/22 21:51:58 christos Exp $");
#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <time.h>
#include <tzfile.h>
#include <unistd.h>
#include <util.h>
#include <getopt.h>
static void stime_arg0(char *, struct timeval *);
static void stime_arg1(char *, struct timeval *);
static void stime_arg2(char *, int, struct timeval *);
static void stime_file(char *, struct timeval *);
__dead static void usage(void);
struct option touch_longopts[] = {
{ "date", required_argument, 0,
'd' },
{ "reference", required_argument, 0,
'r' },
{ NULL, 0, 0,
0 },
};
int
main(int argc, char *argv[])
{
struct stat sb;
struct timeval tv[2];
int aflag, cflag, hflag, mflag, ch, fd, len, rval, timeset;
char *p;
int (*change_file_times)(const char *, const struct timeval *);
int (*get_file_status)(const char *, struct stat *);
setlocale(LC_ALL, "");
aflag = cflag = hflag = mflag = timeset = 0;
if (gettimeofday(&tv[0], NULL))
err(1, "gettimeofday");
while ((ch = getopt_long(argc, argv, "acd:fhmr:t:", touch_longopts,
NULL)) != -1)
switch(ch) {
case 'a':
aflag = 1;
break;
case 'c':
cflag = 1;
break;
case 'd':
timeset = 1;
stime_arg0(optarg, tv);
break;
case 'f':
break;
case 'h':
hflag = 1;
break;
case 'm':
mflag = 1;
break;
case 'r':
timeset = 1;
stime_file(optarg, tv);
break;
case 't':
timeset = 1;
stime_arg1(optarg, tv);
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
/* Default is both -a and -m. */
if (aflag == 0 && mflag == 0)
aflag = mflag = 1;
if (hflag) {
cflag = 1; /* Don't create new file */
change_file_times = lutimes;
get_file_status = lstat;
} else {
change_file_times = utimes;
get_file_status = stat;
}
/*
* If no -r or -t flag, at least two operands, the first of which
* is an 8 or 10 digit number, use the obsolete time specification.
*/
if (!timeset && argc > 1) {
(void)strtol(argv[0], &p, 10);
len = p - argv[0];
if (*p == '\0' && (len == 8 || len == 10)) {
timeset = 1;
stime_arg2(*argv++, len == 10, tv);
}
}
/* Otherwise use the current time of day. */
if (!timeset)
tv[1] = tv[0];
if (*argv == NULL)
usage();
for (rval = EXIT_SUCCESS; *argv; ++argv) {
/* See if the file exists. */
if ((*get_file_status)(*argv, &sb)) {
if (!cflag) {
/* Create the file. */
fd = open(*argv,
O_WRONLY | O_CREAT, DEFFILEMODE);
if (fd == -1 || fstat(fd, &sb) || close(fd)) {
rval = EXIT_FAILURE;
warn("%s", *argv);
continue;
}
/* If using the current time, we're done. */
if (!timeset)
continue;
} else
continue;
}
if (!aflag)
TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atimespec);
if (!mflag)
TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);
/* Try utimes(2). */
if (!(*change_file_times)(*argv, tv))
continue;
/* If the user specified a time, nothing else we can do. */
if (timeset) {
rval = EXIT_FAILURE;
warn("%s", *argv);
}
/*
* System V and POSIX 1003.1 require that a NULL argument
* set the access/modification times to the current time.
* The permission checks are different, too, in that the
* ability to write the file is sufficient. Take a shot.
*/
if (!(*change_file_times)(*argv, NULL))
continue;
rval = EXIT_FAILURE;
warn("%s", *argv);
}
exit(rval);
}
#define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
static void
stime_arg0(char *arg, struct timeval *tvp)
{
tvp[1].tv_sec = tvp[0].tv_sec = parsedate(arg, NULL, NULL);
if (tvp[0].tv_sec == -1)
errx(EXIT_FAILURE, "Could not parse `%s'", arg);
tvp[0].tv_usec = tvp[1].tv_usec = 0;
}
static void
stime_arg1(char *arg, struct timeval *tvp)
{
struct tm *t;
time_t tmptime;
int yearset;
char *p;
/* Start with the current time. */
tmptime = tvp[0].tv_sec;
if ((t = localtime(&tmptime)) == NULL)
err(EXIT_FAILURE, "localtime");
/* [[CC]YY]MMDDhhmm[.SS] */
if ((p = strchr(arg, '.')) == NULL)
t->tm_sec = 0; /* Seconds defaults to 0. */
else {
if (strlen(p + 1) != 2)
goto terr;
*p++ = '\0';
t->tm_sec = ATOI2(p);
}
yearset = 0;
switch (strlen(arg)) {
case 12: /* CCYYMMDDhhmm */
t->tm_year = ATOI2(arg) * 100 - TM_YEAR_BASE;
yearset = 1;
/* FALLTHROUGH */
case 10: /* YYMMDDhhmm */
if (yearset) {
t->tm_year += ATOI2(arg);
} else {
yearset = ATOI2(arg);
if (yearset < 69)
t->tm_year = yearset + 2000 - TM_YEAR_BASE;
else
t->tm_year = yearset + 1900 - TM_YEAR_BASE;
}
/* FALLTHROUGH */
case 8: /* MMDDhhmm */
t->tm_mon = ATOI2(arg);
--t->tm_mon; /* Convert from 01-12 to 00-11 */
/* FALLTHROUGH */
case 6:
t->tm_mday = ATOI2(arg);
/* FALLTHROUGH */
case 4:
t->tm_hour = ATOI2(arg);
/* FALLTHROUGH */
case 2:
t->tm_min = ATOI2(arg);
break;
default:
goto terr;
}
t->tm_isdst = -1; /* Figure out DST. */
tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
if (tvp[0].tv_sec == -1)
terr: errx(EXIT_FAILURE,
"out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
tvp[0].tv_usec = tvp[1].tv_usec = 0;
}
static void
stime_arg2(char *arg, int year, struct timeval *tvp)
{
struct tm *t;
time_t tmptime;
/* Start with the current time. */
tmptime = tvp[0].tv_sec;
if ((t = localtime(&tmptime)) == NULL)
err(EXIT_FAILURE, "localtime");
t->tm_mon = ATOI2(arg); /* MMDDhhmm[yy] */
--t->tm_mon; /* Convert from 01-12 to 00-11 */
t->tm_mday = ATOI2(arg);
t->tm_hour = ATOI2(arg);
t->tm_min = ATOI2(arg);
if (year) {
year = ATOI2(arg);
if (year < 69)
t->tm_year = year + 2000 - TM_YEAR_BASE;
else
t->tm_year = year + 1900 - TM_YEAR_BASE;
}
t->tm_sec = 0;
t->tm_isdst = -1; /* Figure out DST. */
tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
if (tvp[0].tv_sec == -1)
errx(EXIT_FAILURE,
"out of range or illegal time specification: MMDDhhmm[yy]");
tvp[0].tv_usec = tvp[1].tv_usec = 0;
}
static void
stime_file(char *fname, struct timeval *tvp)
{
struct stat sb;
if (stat(fname, &sb))
err(1, "%s", fname);
TIMESPEC_TO_TIMEVAL(&tvp[0], &sb.st_atimespec);
TIMESPEC_TO_TIMEVAL(&tvp[1], &sb.st_mtimespec);
}
static void
usage(void)
{
(void)fprintf(stderr,
"Usage: %s [-acfhm] [-d|--date datetime] [-r|--reference file] [-t time] file ...\n",
getprogname());
exit(EXIT_FAILURE);
}
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