| Current Path : /usr/src/usr.bin/touch/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/usr.bin/touch/touch.c |
/*
* 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.
* 4. 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>
__FBSDID("$FreeBSD: release/9.1.0/usr.bin/touch/touch.c 216370 2010-12-11 08:32:16Z joel $");
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif
#ifndef lint
static const char sccsid[] = "@(#)touch.c 8.1 (Berkeley) 6/6/93";
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
int rw(char *, struct stat *, int);
void stime_arg1(char *, struct timeval *);
void stime_arg2(char *, int, struct timeval *);
void stime_file(char *, struct timeval *);
int timeoffset(char *);
void usage(char *);
int
main(int argc, char *argv[])
{
struct stat sb;
struct timeval tv[2];
int (*stat_f)(const char *, struct stat *);
int (*utimes_f)(const char *, const struct timeval *);
int Aflag, aflag, cflag, fflag, mflag, ch, fd, len, rval, timeset;
char *p;
char *myname;
myname = basename(argv[0]);
Aflag = aflag = cflag = fflag = mflag = timeset = 0;
stat_f = stat;
utimes_f = utimes;
if (gettimeofday(&tv[0], NULL))
err(1, "gettimeofday");
while ((ch = getopt(argc, argv, "A:acfhmr:t:")) != -1)
switch(ch) {
case 'A':
Aflag = timeoffset(optarg);
break;
case 'a':
aflag = 1;
break;
case 'c':
cflag = 1;
break;
case 'f':
fflag = 1;
break;
case 'h':
cflag = 1;
stat_f = lstat;
utimes_f = lutimes;
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(myname);
}
argc -= optind;
argv += optind;
if (aflag == 0 && mflag == 0)
aflag = mflag = 1;
if (timeset) {
if (Aflag) {
/*
* We're setting the time to an offset from a specified
* time. God knows why, but it means that we can set
* that time once and for all here.
*/
if (aflag)
tv[0].tv_sec += Aflag;
if (mflag)
tv[1].tv_sec += Aflag;
Aflag = 0; /* done our job */
}
} else {
/*
* 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, otherwise use the current time.
*/
if (argc > 1) {
strtol(argv[0], &p, 10);
len = p - argv[0];
if (*p == '\0' && (len == 8 || len == 10)) {
timeset = 1;
stime_arg2(*argv++, len == 10, tv);
}
}
/* Both times default to the same. */
tv[1] = tv[0];
}
if (*argv == NULL)
usage(myname);
if (Aflag)
cflag = 1;
for (rval = 0; *argv; ++argv) {
/* See if the file exists. */
if (stat_f(*argv, &sb) != 0) {
if (errno != ENOENT) {
rval = 1;
warn("%s", *argv);
continue;
}
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_atim);
if (!mflag)
TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtim);
/*
* We're adjusting the times based on the file times, not a
* specified time (that gets handled above).
*/
if (Aflag) {
if (aflag) {
TIMESPEC_TO_TIMEVAL(&tv[0], &sb.st_atim);
tv[0].tv_sec += Aflag;
}
if (mflag) {
TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtim);
tv[1].tv_sec += Aflag;
}
}
/* Try utimes(2). */
if (!utimes_f(*argv, tv))
continue;
/* If the user specified a time, nothing else we can do. */
if (timeset || Aflag) {
rval = 1;
warn("%s", *argv);
continue;
}
/*
* 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_f(*argv, NULL))
continue;
/* Try reading/writing. */
if (!S_ISLNK(sb.st_mode) && !S_ISDIR(sb.st_mode)) {
if (rw(*argv, &sb, fflag))
rval = 1;
} else {
rval = 1;
warn("%s", *argv);
}
}
exit(rval);
}
#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
void
stime_arg1(char *arg, struct timeval *tvp)
{
time_t now;
struct tm *t;
int yearset;
char *p;
/* Start with the current time. */
now = tvp[0].tv_sec;
if ((t = localtime(&now)) == NULL)
err(1, "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);
t->tm_year *= 100;
yearset = 1;
/* FALLTHROUGH */
case 10: /* YYMMDDhhmm */
if (yearset) {
yearset = ATOI2(arg);
t->tm_year += yearset;
} else {
yearset = ATOI2(arg);
if (yearset < 69)
t->tm_year = yearset + 2000;
else
t->tm_year = yearset + 1900;
}
t->tm_year -= 1900; /* Convert to UNIX time. */
/* FALLTHROUGH */
case 8: /* MMDDhhmm */
t->tm_mon = ATOI2(arg);
--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);
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(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)
{
time_t now;
struct tm *t;
/* Start with the current time. */
now = tvp[0].tv_sec;
if ((t = localtime(&now)) == NULL)
err(1, "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) {
t->tm_year = ATOI2(arg);
if (t->tm_year < 39) /* support 2000-2038 not 1902-1969 */
t->tm_year += 100;
}
t->tm_isdst = -1; /* Figure out DST. */
tvp[0].tv_sec = tvp[1].tv_sec = mktime(t);
if (tvp[0].tv_sec == -1)
errx(1,
"out of range or illegal time specification: MMDDhhmm[yy]");
tvp[0].tv_usec = tvp[1].tv_usec = 0;
}
/* Calculate a time offset in seconds, given an arg of the format [-]HHMMSS. */
int
timeoffset(char *arg)
{
int offset;
int isneg;
offset = 0;
isneg = *arg == '-';
if (isneg)
arg++;
switch (strlen(arg)) {
default: /* invalid */
errx(1, "Invalid offset spec, must be [-][[HH]MM]SS");
case 6: /* HHMMSS */
offset = ATOI2(arg);
/* FALLTHROUGH */
case 4: /* MMSS */
offset = offset * 60 + ATOI2(arg);
/* FALLTHROUGH */
case 2: /* SS */
offset = offset * 60 + ATOI2(arg);
}
if (isneg)
return (-offset);
else
return (offset);
}
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_atim);
TIMESPEC_TO_TIMEVAL(tvp + 1, &sb.st_mtim);
}
int
rw(char *fname, struct stat *sbp, int force)
{
int fd, needed_chmod, rval;
u_char byte;
/* Try regular files. */
if (!S_ISREG(sbp->st_mode)) {
warnx("%s: %s", fname, strerror(EFTYPE));
return (1);
}
needed_chmod = rval = 0;
if ((fd = open(fname, O_RDWR, 0)) == -1) {
if (!force || chmod(fname, DEFFILEMODE))
goto err;
if ((fd = open(fname, O_RDWR, 0)) == -1)
goto err;
needed_chmod = 1;
}
if (sbp->st_size != 0) {
if (read(fd, &byte, sizeof(byte)) != sizeof(byte))
goto err;
if (lseek(fd, (off_t)0, SEEK_SET) == -1)
goto err;
if (write(fd, &byte, sizeof(byte)) != sizeof(byte))
goto err;
} else {
if (write(fd, &byte, sizeof(byte)) != sizeof(byte)) {
err: rval = 1;
warn("%s", fname);
} else if (ftruncate(fd, (off_t)0)) {
rval = 1;
warn("%s: file modified", fname);
}
}
if (close(fd) && rval != 1) {
rval = 1;
warn("%s", fname);
}
if (needed_chmod && chmod(fname, sbp->st_mode) && rval != 1) {
rval = 1;
warn("%s: permissions modified", fname);
}
return (rval);
}
void
usage(char *myname)
{
fprintf(stderr, "usage:\n" "%s [-A [-][[hh]mm]SS] [-acfhm] [-r file] "
"[-t [[CC]YY]MMDDhhmm[.SS]] file ...\n", myname);
exit(1);
}