path: root/coreutils/touch.c (plain)
blob: 7d584705391ad9660b9e84b38a57b1fd84bf06c7

1	/* vi: set sw=4 ts=4: */
2	/*
3	* Mini touch implementation for busybox
4	*
5	* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
6	*
7	* Licensed under GPLv2 or later, see file LICENSE in this source tree.
8	*/
9	/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
10	*
11	* Previous version called open() and then utime(). While this will be
12	* be necessary to implement -r and -t, it currently only makes things bigger.
13	* Also, exiting on a failure was a bug. All args should be processed.
14	*/
15	//config:config TOUCH
16	//config: bool "touch"
17	//config: default y
18	//config: help
19	//config: touch is used to create or change the access and/or
20	//config: modification timestamp of specified files.
21	//config:
22	//config:config FEATURE_TOUCH_NODEREF
23	//config: bool "Add support for -h"
24	//config: default y
25	//config: depends on TOUCH
26	//config: help
27	//config: Enable touch to have the -h option.
28	//config: This requires libc support for lutimes() function.
29	//config:
30	//config:config FEATURE_TOUCH_SUSV3
31	//config: bool "Add support for SUSV3 features (-d -t -r)"
32	//config: default y
33	//config: depends on TOUCH
34	//config: help
35	//config: Enable touch to use a reference file or a given date/time argument.
36
37	//applet:IF_TOUCH(APPLET_NOFORK(touch, touch, BB_DIR_BIN, BB_SUID_DROP, touch))
38
39	//kbuild:lib-$(CONFIG_TOUCH) += touch.o
40
41	/* BB_AUDIT SUSv3 _NOT_ compliant -- options -a, -m not supported. */
42	/* http://www.opengroup.org/onlinepubs/007904975/utilities/touch.html */
43
44	//usage:#define touch_trivial_usage
45	//usage: "[-c]" IF_FEATURE_TOUCH_SUSV3(" [-d DATE] [-t DATE] [-r FILE]") " FILE..."
46	//usage:#define touch_full_usage "\n\n"
47	//usage: "Update the last-modified date on the given FILE[s]\n"
48	//usage: "\n -c Don't create files"
49	//usage: IF_FEATURE_TOUCH_NODEREF(
50	//usage: "\n -h Don't follow links"
51	//usage: )
52	//usage: IF_FEATURE_TOUCH_SUSV3(
53	//usage: "\n -d DT Date/time to use"
54	//usage: "\n -t DT Date/time to use"
55	//usage: "\n -r FILE Use FILE's date/time"
56	//usage: )
57	//usage:
58	//usage:#define touch_example_usage
59	//usage: "$ ls -l /tmp/foo\n"
60	//usage: "/bin/ls: /tmp/foo: No such file or directory\n"
61	//usage: "$ touch /tmp/foo\n"
62	//usage: "$ ls -l /tmp/foo\n"
63	//usage: "-rw-rw-r-- 1 andersen andersen 0 Apr 15 01:11 /tmp/foo\n"
64
65	/* coreutils implements:
66	* -a change only the access time
67	* -c, --no-create
68	* do not create any files
69	* -d, --date=STRING
70	* parse STRING and use it instead of current time
71	* -f (ignored, BSD compat)
72	* -m change only the modification time
73	* -h, --no-dereference
74	* -r, --reference=FILE
75	* use this file's times instead of current time
76	* -t STAMP
77	* use [[CC]YY]MMDDhhmm[.ss] instead of current time
78	* --time=WORD
79	* change the specified time: WORD is access, atime, or use
80	*/
81
82	#include "libbb.h"
83
84	int touch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
85	int touch_main(int argc UNUSED_PARAM, char **argv)
86	{
87	int fd;
88	int status = EXIT_SUCCESS;
89	int opts;
90	enum {
91	OPT_c = (1 << 0),
92	OPT_r = (1 << 1) * ENABLE_FEATURE_TOUCH_SUSV3,
93	OPT_d = (1 << 2) * ENABLE_FEATURE_TOUCH_SUSV3,
94	OPT_t = (1 << 3) * ENABLE_FEATURE_TOUCH_SUSV3,
95	OPT_h = (1 << 4) * ENABLE_FEATURE_TOUCH_NODEREF,
96	};
97	#if ENABLE_FEATURE_TOUCH_SUSV3
98	# if ENABLE_LONG_OPTS
99	static const char touch_longopts[] ALIGN1 =
100	/* name, has_arg, val */
101	"no-create\0" No_argument "c"
102	"reference\0" Required_argument "r"
103	"date\0" Required_argument "d"
104	IF_FEATURE_TOUCH_NODEREF("no-dereference\0" No_argument "h")
105	;
106	# endif
107	char *reference_file = NULL;
108	char *date_str = NULL;
109	struct timeval timebuf[2];
110	timebuf[1].tv_usec = timebuf[0].tv_usec = 0;
111	#else
112	# define reference_file NULL
113	# define date_str NULL
114	# define timebuf ((struct timeval*)NULL)
115	#endif
116
117	#if ENABLE_FEATURE_TOUCH_SUSV3 && ENABLE_LONG_OPTS
118	applet_long_options = touch_longopts;
119	#endif
120	/* -d and -t both set time. In coreutils,
121	* accepted data format differs a bit between -d and -t.
122	* We accept the same formats for both */
123	opts = getopt32(argv, "c" IF_FEATURE_TOUCH_SUSV3("r:d:t:")
124	IF_FEATURE_TOUCH_NODEREF("h")
125	/*ignored:*/ "fma"
126	IF_FEATURE_TOUCH_SUSV3(, &reference_file)
127	IF_FEATURE_TOUCH_SUSV3(, &date_str)
128	IF_FEATURE_TOUCH_SUSV3(, &date_str)
129	);
130
131	argv += optind;
132	if (!*argv) {
133	bb_show_usage();
134	}
135
136	if (reference_file) {
137	struct stat stbuf;
138	xstat(reference_file, &stbuf);
139	timebuf[1].tv_sec = timebuf[0].tv_sec = stbuf.st_mtime;
140	/* Can use .st_mtim.tv_nsec
141	* (or is it .st_mtimensec?? see date.c)
142	* to set microseconds too.
143	*/
144	}
145
146	if (date_str) {
147	struct tm tm_time;
148	time_t t;
149
150	//memset(&tm_time, 0, sizeof(tm_time));
151	/* Better than memset: makes "HH:MM" dates meaningful */
152	time(&t);
153	localtime_r(&t, &tm_time);
154	parse_datestr(date_str, &tm_time);
155
156	/* Correct any day of week and day of year etc. fields */
157	tm_time.tm_isdst = -1; /* Be sure to recheck dst */
158	t = validate_tm_time(date_str, &tm_time);
159
160	timebuf[1].tv_sec = timebuf[0].tv_sec = t;
161	}
162
163	do {
164	int result;
165	result = (
166	#if ENABLE_FEATURE_TOUCH_NODEREF
167	(opts & OPT_h) ? utimes :
168	#endif
169	utimes)(*argv, (reference_file || date_str) ? timebuf : NULL);
170	if (result != 0) {
171	if (errno == ENOENT) { /* no such file? */
172	if (opts & OPT_c) {
173	/* Creation is disabled, so ignore */
174	continue;
175	}
176	/* Try to create the file */
177	fd = open(*argv, O_RDWR | O_CREAT, 0666);
178	if (fd >= 0) {
179	xclose(fd);
180	if (reference_file || date_str)
181	utimes(*argv, timebuf);
182	continue;
183	}
184	}
185	status = EXIT_FAILURE;
186	bb_simple_perror_msg(*argv);
187	}
188	} while (*++argv);
189
190	return status;
191	}
192