/* $NetBSD: touch.c,v 1.40 2024/02/10 00:19:30 kre 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 1.40 2024/02/10 00:19:30 kre Exp $");
#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <math.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(const char *, struct timespec *);
static void stime_arg1(char *, struct timespec *);
static void stime_arg2(const char *, int, struct timespec *);
static void stime_file(const char *, struct timespec *,
int (const char *, struct stat *));
static int stime_posix(const char *, struct timespec *);
static int difftm(const struct tm *, const struct tm *);
__dead static void usage(void);
struct option touch_longopts[] = {
{ "date", required_argument, 0,
'd' },
{ "reference", required_argument, 0,
'r' },
{ NULL, 0, 0,
0 },
};
#define YEAR_BOUNDARY 69
#define LOW_YEAR_CENTURY 2000 /* for 2 digit years < YEAR_BOUNDARY */
#define HIGH_YEAR_CENTURY 1900 /* for 2 digit years >= " */
#define NO_TIME ((time_t)-1) /* time_t might be unsigned */
int
main(int argc, char *argv[])
{
struct stat sb;
struct timespec ts[2];
int aflag, cflag, Dflag, hflag, mflag, ch, fd, len, rval, timeset;
char *p;
int (*change_file_times)(const char *, const struct timespec *);
int (*get_file_status)(const char *, struct stat *);
setlocale(LC_ALL, "");
aflag = cflag = Dflag = hflag = mflag = timeset = 0;
if (clock_gettime(CLOCK_REALTIME, &ts[0]))
err(1, "clock_gettime");
while ((ch = getopt_long(argc, argv, "acDd:fhmR:r:t:", touch_longopts,
NULL)) != -1)
switch (ch) {
case 'a':
aflag = 1;
break;
case 'c':
cflag = 1;
break;
case 'D':
Dflag = 1;
break;
case 'd':
timeset = 1;
if (!stime_posix(optarg, ts))
stime_arg0(optarg, ts);
break;
case 'f':
break;
case 'h':
hflag = 1;
break;
case 'm':
mflag = 1;
break;
case 'R':
timeset = 1;
stime_file(optarg, ts, lstat);
break;
case 'r':
timeset = 1;
stime_file(optarg, ts, stat);
break;
case 't':
timeset = 1;
stime_arg1(optarg, ts);
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 = lutimens;
get_file_status = lstat;
} else {
change_file_times = utimens;
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, ts);
}
}
/* Otherwise use the current time of day. */
if (!timeset)
ts[1] = ts[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)
ts[0] = sb.st_atimespec;
if (!mflag)
ts[1] = sb.st_mtimespec;
if (Dflag &&
timespeccmp(&ts[0], &sb.st_atimespec, ==) &&
timespeccmp(&ts[1], &sb.st_mtimespec, ==))
continue;
/* Try utimes(2). */
if (!(*change_file_times)(*argv, ts))
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(const char *arg, struct timespec *tsp)
{
tsp[1].tv_sec = tsp[0].tv_sec = parsedate(arg, NULL, NULL);
if (tsp[0].tv_sec == NO_TIME)
errx(EXIT_FAILURE, "Could not parse `%s'", arg);
tsp[0].tv_nsec = tsp[1].tv_nsec = 0;
}
static void
stime_arg1(char *arg, struct timespec *tsp)
{
struct tm *t, tm;
time_t tmptime;
int yearset;
char *p;
char *initarg = arg;
/* Start with the current time. */
tmptime = tsp[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 < YEAR_BOUNDARY)
t->tm_year = yearset +
LOW_YEAR_CENTURY - TM_YEAR_BASE;
else
t->tm_year = yearset +
HIGH_YEAR_CENTURY - 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. */
tm = *t;
tsp[0].tv_sec = tsp[1].tv_sec = mktime(t);
if (tsp[0].tv_sec == NO_TIME || difftm(t, &tm))
terr: errx(EXIT_FAILURE, "out of range or bad time specification:\n"
"\t'%s' should be [[CC]YY]MMDDhhmm[.ss]", initarg);
tsp[0].tv_nsec = tsp[1].tv_nsec = 0;
}
static void
stime_arg2(const char *arg, int year, struct timespec *tsp)
{
struct tm *t, tm;
time_t tmptime;
/* Start with the current time. */
tmptime = tsp[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 < YEAR_BOUNDARY)
t->tm_year = year + LOW_YEAR_CENTURY - TM_YEAR_BASE;
else
t->tm_year = year + HIGH_YEAR_CENTURY - TM_YEAR_BASE;
}
t->tm_sec = 0;
t->tm_isdst = -1; /* Figure out DST. */
tm = *t;
tsp[0].tv_sec = tsp[1].tv_sec = mktime(t);
if (tsp[0].tv_sec == NO_TIME || difftm(t, &tm))
errx(EXIT_FAILURE,
"out of range or bad time specification: MMDDhhmm[YY]");
tsp[0].tv_nsec = tsp[1].tv_nsec = 0;
}
static void
stime_file(const char *fname, struct timespec *tsp,
int statfunc(const char *, struct stat *))
{
struct stat sb;
if (statfunc(fname, &sb))
err(1, "%s", fname);
tsp[0] = sb.st_atimespec;
tsp[1] = sb.st_mtimespec;
}
static int
stime_posix(const char *arg, struct timespec *tsp)
{
struct tm tm, tms;
const char *p;
char *ep;
int utc = 0;
long val;
#define isdigch(c) (isdigit((int)((unsigned char)(c))))
if ((p = strchr(arg, '-')) == NULL)
return 0;
if (p - arg < 4) /* at least 4 year digits required */
return 0;
if (!isdigch(arg[0])) /* and the first must be a digit! */
return 0;
(void)memset(&tm, 0, sizeof tm);
errno = 0;
val = strtol(arg, &ep, 10); /* YYYY */
if (val < 0 || val > INT_MAX)
return 0;
if (*ep != '-')
return 0;
tm.tm_year = (int)val - 1900;
p = ep + 1;
if (!isdigch(*p))
return 0;
val = strtol(p, &ep, 10); /* MM */
if (val < 1 || val > 12)
return 0;
if (*ep != '-' || ep != p + 2)
return 0;
tm.tm_mon = (int)val - 1;
p = ep + 1;
if (!isdigch(*p))
return 0;
val = strtol(p, &ep, 10); /* DD */
if (val < 1 || val > 31)
return 0;
if ((*ep != 'T' && *ep != ' ') || ep != p + 2)
return 0;
tm.tm_mday = (int)val;
p = ep + 1;
if (!isdigch(*p))
return 0;
val = strtol(p, &ep, 10); /* hh */
if (val < 0 || val > 23)
return 0;
if (*ep != ':' || ep != p + 2)
return 0;
tm.tm_hour = (int)val;
p = ep + 1;
if (!isdigch(*p))
return 0;
val = strtol(p, &ep, 10); /* mm */
if (val < 0 || val > 59)
return 0;
if (*ep != ':' || ep != p + 2)
return 0;
tm.tm_min = (int)val;
p = ep + 1;
if (!isdigch(*p))
return 0;
val = strtol(p, &ep, 10); /* ss (or in POSIX, SS) */
if (val < 0 || val > 60)
return 0;
if ((*ep != '.' && *ep != ',' && *ep != 'Z' && *ep != '\0') ||
ep != p + 2)
return 0;
tm.tm_sec = (int)val;
if (*ep == ',' || *ep == '.') {
double frac;
ptrdiff_t fdigs;
p = ep + 1;
if (!isdigch(*p))
return 0;
val = strtol(p, &ep, 10);
if (val < 0)
return 0;
if (ep == p) /* at least 1 digit required */
return 0;
if (*ep != 'Z' && *ep != '\0')
return 0;
if (errno != 0)
return 0;
fdigs = ep - p;
if (fdigs > 15) {
/* avoid being absurd */
/* don't want to risk 10^fdigs being INF */
if (val == 0)
fdigs = 1;
else while (fdigs > 15) {
val = (val + 5) / 10;
fdigs--;
}
}
frac = pow(10.0, (double)fdigs);
tsp[0].tv_nsec = tsp[1].tv_nsec =
(long)round(((double)val / frac) * 1000000000.0);
} else
tsp[0].tv_nsec = tsp[1].tv_nsec = 0;
if (*ep == 'Z') {
if (ep[1] != '\0')
return 0;
utc = 1;
}
if (errno != 0)
return 0;
tm.tm_isdst = -1;
tms = tm;
if (utc)
tsp[0].tv_sec = tsp[1].tv_sec = timegm(&tm);
else
tsp[0].tv_sec = tsp[1].tv_sec = mktime(&tm);
if ((errno != 0 && tsp[1].tv_sec == NO_TIME) || difftm(&tm, &tms))
return 0;
return 1;
}
/*
* Determine whether 2 struct tn's are different
* return true (1) if theu are, false (0) otherwise.
*
* Note that we only consider the fields that are set
* for mktime() to use - if mktime() returns them
* differently than was set, then there was a problem
* with the setting.
*/
static int
difftm(const struct tm *t1, const struct tm *t2)
{
#define CHK(fld) do { \
if (t1->tm_##fld != t2->tm_##fld) { \
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);
}