OpenSolaris_b135/cmd/touch/touch.c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/* Copyright (c) 1987, 1988 Microsoft Corporation */
/* All Rights Reserved */
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <ctype.h>
#include <libgen.h>
#include <fcntl.h>
#include <pwd.h>
#include <time.h>
#include <unistd.h>
#include <locale.h>
#include <sys/time.h>
#include <errno.h>
#define BADTIME "bad time specification"
static char *myname;
static int isnumber(char *);
static int atoi_for2(char *);
static void usage(const int);
static void touchabort(const char *);
static void parse_datetime(char *, timespec_t *);
static void parse_time(char *, timespec_t *);
static void parse_timespec(char *, timespec_t *);
int
main(int argc, char *argv[])
{
int c;
int aflag = 0;
int cflag = 0;
int rflag = 0;
int mflag = 0;
int tflag = 0;
int stflag = 0;
int status = 0;
int usecurrenttime = 1;
int timespecified;
int optc;
int fd = -1;
mode_t cmode =
(S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
struct stat stbuf;
struct stat prstbuf;
timespec_t times[2];
timespec_t *tsp;
(void) setlocale(LC_ALL, "");
#if !defined(TEXT_DOMAIN)
#define TEXT_DOMAIN "SYS_TEST"
#endif
(void) textdomain(TEXT_DOMAIN);
myname = basename(argv[0]);
if (strcmp(myname, "settime") == 0) {
cflag++;
stflag++;
while ((optc = getopt(argc, argv, "f:")) != EOF) {
switch (optc) {
case 'f':
rflag++;
usecurrenttime = 0;
if (stat(optarg, &prstbuf) == -1) {
(void) fprintf(stderr, "%s: ", myname);
perror(optarg);
return (2);
}
break;
case '?':
usage(stflag);
break;
}
}
} else {
while ((optc = getopt(argc, argv, "acfmr:d:t:")) != EOF) {
switch (optc) {
case 'a':
aflag++;
break;
case 'c':
cflag++;
break;
case 'f': /* silently ignore for UCB compat */
break;
case 'm':
mflag++;
break;
case 'r': /* same as settime's -f option */
rflag++;
usecurrenttime = 0;
if (stat(optarg, &prstbuf) == -1) {
(void) fprintf(stderr, "%s: ", myname);
perror(optarg);
return (2);
}
break;
case 'd':
tflag++;
usecurrenttime = 0;
parse_datetime(optarg, &prstbuf.st_mtim);
prstbuf.st_atim = prstbuf.st_mtim;
break;
case 't':
tflag++;
usecurrenttime = 0;
parse_time(optarg, &prstbuf.st_mtim);
prstbuf.st_atim = prstbuf.st_mtim;
break;
case '?':
usage(stflag);
break;
}
}
}
argc -= optind;
argv += optind;
if ((argc < 1) || (rflag + tflag > 1))
usage(stflag);
if ((aflag == 0) && (mflag == 0)) {
aflag = 1;
mflag = 1;
}
if ((aflag && !mflag) || (mflag && !aflag))
usecurrenttime = 0;
/*
* If -r, -t or -d has been specified,
* use the specified time.
*/
timespecified = (rflag | tflag);
if (timespecified == 0 && argc >= 2 && isnumber(*argv) &&
(strlen(*argv) == 8 || strlen(*argv) == 10)) {
/*
* time is specified as an operand; use it.
*/
parse_timespec(*argv++, &prstbuf.st_mtim);
prstbuf.st_atim = prstbuf.st_mtim;
usecurrenttime = 0;
timespecified = 1;
argc--;
}
for (c = 0; c < argc; c++) {
if (stat(argv[c], &stbuf)) {
/*
* If stat failed for reasons other than EOVERFLOW or
* ENOENT, the file should not be created, since this
* can clobber the contents of an existing file.
*/
if (errno == EOVERFLOW) {
/*
* Since we have EOVERFLOW,
* we know the file exists.
*/
/* EMPTY */;
} else if (errno != ENOENT) {
(void) fprintf(stderr,
gettext("%s: cannot stat %s: %s\n"),
myname, argv[c], strerror(errno));
status++;
continue;
} else if (cflag) {
continue;
} else if ((fd = creat(argv[c], cmode)) < 0) {
(void) fprintf(stderr,
gettext("%s: cannot create %s: %s\n"),
myname, argv[c], strerror(errno));
status++;
continue;
}
}
if (usecurrenttime) {
tsp = NULL;
} else {
if (mflag == 0) {
/* Keep the mtime of the file */
times[1].tv_nsec = UTIME_OMIT;
} else if (timespecified) {
/* Set the specified time */
times[1] = prstbuf.st_mtim;
} else {
/* Otherwise, use the current time */
times[1].tv_nsec = UTIME_NOW;
}
if (aflag == 0) {
/* Keep the atime of the file */
times[0].tv_nsec = UTIME_OMIT;
} else if (timespecified) {
/* Set the specified time */
times[0] = prstbuf.st_atim;
} else {
/* Otherwise, use the current time */
times[0].tv_nsec = UTIME_NOW;
}
tsp = times;
}
if ((fd >= 0 && futimens(fd, tsp) != 0) ||
(fd < 0 && utimensat(AT_FDCWD, argv[c], tsp, 0) != 0)) {
(void) fprintf(stderr,
gettext("%s: cannot change times on %s: %s\n"),
myname, argv[c], strerror(errno));
status++;
}
if (fd >= 0) {
(void) close(fd);
fd = -1;
}
}
return (status);
}
static int
isnumber(char *s)
{
int c;
while ((c = *s++) != '\0')
if (!isdigit(c))
return (0);
return (1);
}
static void
parse_datetime(char *t, timespec_t *ts)
{
char date[64];
char *year;
char *month;
char *day;
char *hour;
char *minute;
char *second;
char *fraction;
int utc = 0;
char *p;
time_t when;
int nanoseconds;
struct tm tm;
/*
* The date string has the format (defined by the touch(1) spec):
* YYYY-MM-DDThh:mm:SS[.frac][tz]
* YYYY-MM-DDThh:mm:SS[,frac][tz]
* T is either the literal 'T' or is a space character.
* tz is either empty (local time) or the literal 'Z' (UTC).
* All other fields are strings of digits.
*/
/*
* Make a copy of the date string so it can be tokenized.
*/
if (strlcpy(date, t, sizeof (date)) >= sizeof (date))
touchabort(BADTIME);
/* deal with the optional trailing 'Z' first */
p = date + strlen(date) - 1;
if (*p == 'Z') {
utc = 1;
*p = '\0';
}
/* break out the component tokens */
p = date;
year = strsep(&p, "-");
month = strsep(&p, "-");
day = strsep(&p, "T ");
hour = strsep(&p, ":");
minute = strsep(&p, ":");
second = strsep(&p, ".,");
fraction = p;
/* verify the component tokens */
if (year == NULL || strlen(year) < 4 || !isnumber(year) ||
month == NULL || strlen(month) != 2 || !isnumber(month) ||
day == NULL || strlen(day) != 2 || !isnumber(day) ||
hour == NULL || strlen(hour) != 2 || !isnumber(hour) ||
minute == NULL || strlen(minute) != 2 || !isnumber(minute) ||
second == NULL || strlen(second) != 2 || !isnumber(second) ||
(fraction != NULL && (*fraction == '\0' || !isnumber(fraction))))
touchabort(BADTIME);
(void) memset(&tm, 0, sizeof (struct tm));
tm.tm_year = atoi(year) - 1900;
tm.tm_mon = atoi(month) - 1;
tm.tm_mday = atoi(day);
tm.tm_hour = atoi(hour);
tm.tm_min = atoi(minute);
tm.tm_sec = atoi(second);
if (utc) {
(void) setenv("TZ", "GMT0", 1);
tzset();
}
errno = 0;
if ((when = mktime(&tm)) == -1 && errno != 0)
touchabort(BADTIME);
if (tm.tm_isdst)
when -= (timezone - altzone);
if (fraction == NULL) {
nanoseconds = 0;
} else {
/* truncate beyond 9 digits (nanoseconds) */
if (strlen(fraction) > 9)
fraction[9] = '\0';
nanoseconds = atoi(fraction);
switch (strlen(fraction)) {
case 1:
nanoseconds *= 100000000;
break;
case 2:
nanoseconds *= 10000000;
break;
case 3:
nanoseconds *= 1000000;
break;
case 4:
nanoseconds *= 100000;
break;
case 5:
nanoseconds *= 10000;
break;
case 6:
nanoseconds *= 1000;
break;
case 7:
nanoseconds *= 100;
break;
case 8:
nanoseconds *= 10;
break;
case 9:
break;
}
}
ts->tv_sec = when;
ts->tv_nsec = nanoseconds;
}
static void
parse_time(char *t, timespec_t *ts)
{
int century = 0;
int seconds = 0;
char *p;
time_t when;
struct tm tm;
/*
* time in the following format (defined by the touch(1) spec):
* [[CC]YY]MMDDhhmm[.SS]
*/
if ((p = strchr(t, '.')) != NULL) {
if (strchr(p+1, '.') != NULL)
touchabort(BADTIME);
seconds = atoi_for2(p+1);
*p = '\0';
}
(void) memset(&tm, 0, sizeof (struct tm));
when = time(0);
tm.tm_year = localtime(&when)->tm_year;
switch (strlen(t)) {
case 12: /* CCYYMMDDhhmm */
century = atoi_for2(t);
t += 2;
/* FALLTHROUGH */
case 10: /* YYMMDDhhmm */
tm.tm_year = atoi_for2(t);
t += 2;
if (century == 0) {
if (tm.tm_year < 69)
tm.tm_year += 100;
} else
tm.tm_year += (century - 19) * 100;
/* FALLTHROUGH */
case 8: /* MMDDhhmm */
tm.tm_mon = atoi_for2(t) - 1;
t += 2;
tm.tm_mday = atoi_for2(t);
t += 2;
tm.tm_hour = atoi_for2(t);
t += 2;
tm.tm_min = atoi_for2(t);
tm.tm_sec = seconds;
break;
default:
touchabort(BADTIME);
}
if ((when = mktime(&tm)) == -1)
touchabort(BADTIME);
if (tm.tm_isdst)
when -= (timezone-altzone);
ts->tv_sec = when;
ts->tv_nsec = 0;
}
static void
parse_timespec(char *t, timespec_t *ts)
{
time_t when;
struct tm tm;
/*
* time in the following format (defined by the touch(1) spec):
* MMDDhhmm[yy]
*/
(void) memset(&tm, 0, sizeof (struct tm));
when = time(0);
tm.tm_year = localtime(&when)->tm_year;
switch (strlen(t)) {
case 10: /* MMDDhhmmyy */
tm.tm_year = atoi_for2(t+8);
if (tm.tm_year < 69)
tm.tm_year += 100;
/* FALLTHROUGH */
case 8: /* MMDDhhmm */
tm.tm_mon = atoi_for2(t) - 1;
t += 2;
tm.tm_mday = atoi_for2(t);
t += 2;
tm.tm_hour = atoi_for2(t);
t += 2;
tm.tm_min = atoi_for2(t);
break;
default:
touchabort(BADTIME);
}
if ((when = mktime(&tm)) == -1)
touchabort(BADTIME);
if (tm.tm_isdst)
when -= (timezone - altzone);
ts->tv_sec = when;
ts->tv_nsec = 0;
}
static int
atoi_for2(char *p)
{
int value;
value = (*p - '0') * 10 + *(p+1) - '0';
if ((value < 0) || (value > 99))
touchabort(BADTIME);
return (value);
}
static void
touchabort(const char *message)
{
(void) fprintf(stderr, "%s: %s\n", myname, gettext(message));
exit(1);
}
static void
usage(const int settime)
{
if (settime) {
(void) fprintf(stderr, gettext(
"usage: %s [-f file] [mmddhhmm[yy]] file...\n"), myname);
exit(2);
}
(void) fprintf(stderr, gettext(
"usage: %s [-acm] [-r ref_file] file...\n"
" %s [-acm] [-t [[CC]YY]MMDDhhmm[.SS]] file...\n"
" %s [-acm] [-d YYYY-MM-DDThh:mm:SS[.frac][Z]] file...\n"
" %s [-acm] [-d YYYY-MM-DDThh:mm:SS[,frac][Z]] file...\n"
" %s [-acm] [MMDDhhmm[yy]] file...\n"),
myname, myname, myname, myname, myname);
exit(2);
}