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/* vi: set sw=4 ts=4: */
/*
* Mini touch implementation for busybox
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
*
* Previous version called open() and then utime(). While this will be
* be necessary to implement -r and -t, it currently only makes things bigger.
* Also, exiting on a failure was a bug. All args should be processed.
*/
//config:config TOUCH
//config: bool "touch (5.9 kb)"
//config: default y
//config: help
//config: touch is used to create or change the access and/or
//config: modification timestamp of specified files.
//config:
//config:config FEATURE_TOUCH_SUSV3
//config: bool "Add support for SUSV3 features (-a -d -m -t -r)"
//config: default y
//config: depends on TOUCH
//config: help
//config: Enable touch to use a reference file or a given date/time argument.
//applet:IF_TOUCH(APPLET_NOFORK(touch, touch, BB_DIR_BIN, BB_SUID_DROP, touch))
//kbuild:lib-$(CONFIG_TOUCH) += touch.o
//usage:#define touch_trivial_usage
//usage: "[-c" IF_FEATURE_TOUCH_SUSV3("am") "]"
//usage: IF_FEATURE_TOUCH_SUSV3(" [-d DATE] [-t DATE] [-r FILE]")
//usage: " FILE..."
//usage:#define touch_full_usage "\n\n"
//usage: "Update mtime of FILE\n"
//usage: "\n -c Don't create files"
//usage: "\n -h Don't follow links"
//usage: IF_FEATURE_TOUCH_SUSV3(
//usage: "\n -a Change only atime"
//usage: "\n -m Change only mtime"
//usage: "\n -d DT Date/time to use"
//usage: "\n -t DT Date/time to use"
//usage: "\n -r FILE Use FILE's date/time"
//usage: )
//usage:
//usage:#define touch_example_usage
//usage: "$ ls -l /tmp/foo\n"
//usage: "/bin/ls: /tmp/foo: No such file or directory\n"
//usage: "$ touch /tmp/foo\n"
//usage: "$ ls -l /tmp/foo\n"
//usage: "-rw-rw-r-- 1 andersen andersen 0 Apr 15 01:11 /tmp/foo\n"
/* coreutils implements:
* -a change only the access time
* -c, --no-create
* do not create any files
* -d, --date=STRING
* parse STRING and use it instead of current time
* -f (ignored, BSD compat)
* -m change only the modification time
* -h, --no-dereference
* -r, --reference=FILE
* use this file's times instead of current time
* -t STAMP
* use [[CC]YY]MMDDhhmm[.ss] instead of current time
* --time=WORD
* change the specified time: WORD is access, atime, or use
*/
#include "libbb.h"
int touch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int touch_main(int argc UNUSED_PARAM, char **argv)
{
int fd;
int opts;
smalluint status = EXIT_SUCCESS;
#if ENABLE_FEATURE_TOUCH_SUSV3
char *reference_file;
char *date_str;
/* timebuf[0] is atime, timebuf[1] is mtime */
struct timespec timebuf[2];
#else
# define reference_file NULL
# define date_str NULL
# define timebuf ((struct timespec*)NULL)
#endif
enum {
OPT_c = (1 << 0),
OPT_h = (1 << 1),
OPT_r = (1 << 2) * ENABLE_FEATURE_TOUCH_SUSV3,
OPT_d = (1 << 3) * ENABLE_FEATURE_TOUCH_SUSV3,
OPT_t = (1 << 4) * ENABLE_FEATURE_TOUCH_SUSV3,
OPT_a = (1 << 5) * ENABLE_FEATURE_TOUCH_SUSV3,
OPT_m = (1 << 6) * ENABLE_FEATURE_TOUCH_SUSV3,
};
#if ENABLE_LONG_OPTS
static const char touch_longopts[] ALIGN1 =
/* name, has_arg, val */
"no-create\0" No_argument "c"
"no-dereference\0" No_argument "h"
IF_FEATURE_TOUCH_SUSV3("reference\0" Required_argument "r")
IF_FEATURE_TOUCH_SUSV3("date\0" Required_argument "d")
;
#endif
/* -d and -t both set time. In coreutils,
* accepted data format differs a bit between -d and -t.
* We accept the same formats for both
*/
opts = getopt32long(argv, "^"
"ch"
IF_FEATURE_TOUCH_SUSV3("r:d:t:am")
/*ignored:*/ "f" IF_NOT_FEATURE_TOUCH_SUSV3("am")
"\0" /* opt_complementary: */
/* at least one arg: */ "-1"
/* coreutils forbids -r and -t at once: */ IF_FEATURE_TOUCH_SUSV3(":r--t:t--r")
/* but allows these combinations: "r--d:d--r:t--d:d--t" */
, touch_longopts
#if ENABLE_FEATURE_TOUCH_SUSV3
, &reference_file
, &date_str
, &date_str
#endif
);
timebuf[0].tv_nsec = timebuf[1].tv_nsec = UTIME_NOW;
if (opts & OPT_r) {
struct stat stbuf;
xstat(reference_file, &stbuf);
timebuf[0].tv_sec = stbuf.st_atime;
timebuf[1].tv_sec = stbuf.st_mtime;
timebuf[0].tv_nsec = stbuf.st_atim.tv_nsec;
timebuf[1].tv_nsec = stbuf.st_mtim.tv_nsec;
}
if (opts & (OPT_d|OPT_t)) {
struct tm tm_time;
time_t t;
//memset(&tm_time, 0, sizeof(tm_time));
/* Better than memset: makes "HH:MM" dates meaningful */
time(&t);
localtime_r(&t, &tm_time);
parse_datestr(date_str, &tm_time);
/* Correct any day of week and day of year etc. fields */
tm_time.tm_isdst = -1; /* Be sure to recheck dst */
t = validate_tm_time(date_str, &tm_time);
timebuf[1].tv_sec = timebuf[0].tv_sec = t;
timebuf[1].tv_nsec = timebuf[0].tv_nsec = 0;
}
/* If both -a and -m specified, both times should be set.
* IOW: set OMIT only if one, not both, of them is given!
*/
if ((opts & (OPT_a|OPT_m)) == OPT_a)
timebuf[1].tv_nsec = UTIME_OMIT;
if ((opts & (OPT_a|OPT_m)) == OPT_m)
timebuf[0].tv_nsec = UTIME_OMIT;
argv += optind;
do {
int result = utimensat(AT_FDCWD, *argv, timebuf,
(opts & OPT_h) ? AT_SYMLINK_NOFOLLOW : 0);
if (result != 0) {
if (errno == ENOENT) { /* no such file? */
if (opts & OPT_c) {
/* Creation is disabled, so ignore */
continue;
}
/* Try to create the file */
fd = open(*argv, O_RDWR | O_CREAT, 0666);
if (fd >= 0) {
if (opts & (OPT_r|OPT_d|OPT_t))
futimens(fd, timebuf);
xclose(fd);
continue;
}
}
status = EXIT_FAILURE;
bb_simple_perror_msg(*argv);
}
} while (*++argv);
return status;
}
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