minix/commands/touch/touch.c

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/* $OpenBSD: touch.c,v 1.17 2007/08/06 19:16:06 sobrado Exp $ */
/* $NetBSD: touch.c,v 1.11 1995/08/31 22:10:06 jtc 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/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <ctype.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 <utime.h>
#include <tzfile.h>
#include <unistd.h>
void stime_arg1(char *, struct timeval *);
void stime_arg2(char *, int, struct timeval *);
void stime_file(char *, struct timeval *);
__dead void usage(void);
char * __progname;
int
main(int argc, char *argv[])
{
struct stat sb;
struct timeval tv[2];
int aflag, cflag, mflag, ch, fd, len, rval, timeset;
char *p;
(void)setlocale(LC_ALL, "");
__progname = argv[0];
aflag = cflag = mflag = timeset = 0;
if (gettimeofday(&tv[0], NULL))
err(1, "gettimeofday");
while ((ch = getopt(argc, argv, "acfmr:t:")) != -1)
switch (ch) {
case 'a':
aflag = 1;
break;
case 'c':
cflag = 1;
break;
case 'f':
break;
case 'm':
mflag = 1;
break;
case 'r':
timeset = 1;
stime_file(optarg, tv);
break;
case 't':
timeset = 1;
stime_arg1(optarg, tv);
break;
default:
usage();
}
argc -= optind;
argv += optind;
/* Default is both -a and -m. */
if (aflag == 0 && mflag == 0)
aflag = mflag = 1;
/*
* 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 = 0; *argv; ++argv) {
/* See if the file exists. */
if (stat(*argv, &sb)) {
if (!cflag) {
/* Create the file. */
fd = open(*argv,
O_WRONLY | O_CREAT, DEFFILEMODE);
if (fd == -1 || fstat(fd, &sb) || close(fd)) {
rval = 1;
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 (!utimes(*argv, tv))
continue;
/* If the user specified a time, nothing else we can do. */
if (timeset) {
rval = 1;
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 (!utimes(*argv, NULL))
continue;
rval = 1;
warn("%s", *argv);
}
exit(rval);
}
#define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
void
stime_arg1(char *arg, struct timeval *tvp)
{
struct tm *lt;
time_t tmptime;
int yearset;
char *dot, *p;
/* Start with the current time. */
tmptime = tvp[0].tv_sec;
if ((lt = localtime(&tmptime)) == NULL)
err(1, "localtime");
/* [[CC]YY]MMDDhhmm[.SS] */
for (p = arg, dot = NULL; *p != '\0'; p++) {
if (*p == '.' && dot == NULL)
dot = p;
else if (!isdigit((unsigned char)*p))
goto terr;
}
if (dot == NULL)
lt->tm_sec = 0; /* Seconds defaults to 0. */
else {
*dot++ = '\0';
if (strlen(dot) != 2)
goto terr;
lt->tm_sec = ATOI2(dot);
if (lt->tm_sec > 61) /* Could be leap second. */
goto terr;
}
yearset = 0;
switch (strlen(arg)) {
case 12: /* CCYYMMDDhhmm */
lt->tm_year = ATOI2(arg) * 100 - TM_YEAR_BASE;
yearset = 1;
/* FALLTHROUGH */
case 10: /* YYMMDDhhmm */
if (yearset) {
yearset = ATOI2(arg);
lt->tm_year += yearset;
} else {
yearset = ATOI2(arg);
/* Preserve current century. */
lt->tm_year = ((lt->tm_year / 100) * 100) + yearset;
}
/* FALLTHROUGH */
case 8: /* MMDDhhmm */
lt->tm_mon = ATOI2(arg);
if (lt->tm_mon > 12 || lt->tm_mon == 0)
goto terr;
--lt->tm_mon; /* Convert from 01-12 to 00-11 */
lt->tm_mday = ATOI2(arg);
if (lt->tm_mday > 31 || lt->tm_mday == 0)
goto terr;
lt->tm_hour = ATOI2(arg);
if (lt->tm_hour > 23)
goto terr;
lt->tm_min = ATOI2(arg);
if (lt->tm_min > 59)
goto terr;
break;
default:
goto terr;
}
lt->tm_isdst = -1; /* Figure out DST. */
tvp[0].tv_sec = tvp[1].tv_sec = mktime(lt);
if (tvp[0].tv_sec == -1)
terr: errx(1,
"out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
tvp[0].tv_usec = tvp[1].tv_usec = 0;
}
void
stime_arg2(char *arg, int year, struct timeval *tvp)
{
struct tm *lt;
time_t tmptime;
/* Start with the current time. */
tmptime = tvp[0].tv_sec;
if ((lt = localtime(&tmptime)) == NULL)
err(1, "localtime");
lt->tm_mon = ATOI2(arg); /* MMDDhhmm[YY] */
if (lt->tm_mon > 12 || lt->tm_mon == 0)
goto terr;
--lt->tm_mon; /* Convert from 01-12 to 00-11 */
lt->tm_mday = ATOI2(arg);
if (lt->tm_mday > 31 || lt->tm_mday == 0)
goto terr;
lt->tm_hour = ATOI2(arg);
if (lt->tm_hour > 23)
goto terr;
lt->tm_min = ATOI2(arg);
if (lt->tm_min > 59)
goto terr;
if (year) {
year = ATOI2(arg); /* Preserve current century. */
lt->tm_year = ((lt->tm_year / 100) * 100) + year;
}
lt->tm_sec = 0;
lt->tm_isdst = -1; /* Figure out DST. */
tvp[0].tv_sec = tvp[1].tv_sec = mktime(lt);
if (tvp[0].tv_sec == -1)
terr: errx(1,
"out of range or illegal time specification: MMDDhhmm[YY]");
tvp[0].tv_usec = tvp[1].tv_usec = 0;
}
void
stime_file(char *fname, struct timeval *tvp)
{
struct stat sb;
if (stat(fname, &sb))
err(1, "%s", fname);
TIMESPEC_TO_TIMEVAL(tvp, &sb.st_atimespec);
TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtimespec);
}
__dead void
usage(void)
{
extern char *__progname;
(void)fprintf(stderr,
"usage: %s [-acm] [-r file] [-t [[CC]YY]MMDDhhmm[.SS]] file ...\n",
__progname);
exit(1);
}