busybox/coreutils/touch.c

/* 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 tarball for details.
 */

/* BB_AUDIT SUSv3 _NOT_ compliant -- options -a, -m, -r, -t not supported. */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/touch.html */

/* 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.
 */

#include "libbb.h"

/* This is a NOFORK applet. Be very careful! */

/* 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
 * -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
 */

int touch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int touch_main(int argc UNUSED_PARAM, char **argv)
{
#if ENABLE_DESKTOP
	struct utimbuf timebuf;
	char *reference_file = NULL;
#else
#define reference_file NULL
#define timebuf        (*(struct utimbuf*)NULL)
#endif
	int fd;
	int status = EXIT_SUCCESS;
	int flags = getopt32(argv, "c" USE_DESKTOP("r:")
				/*ignored:*/ "fma"
				USE_DESKTOP(, &reference_file));

	flags &= 1; /* only -c bit is left */
	argv += optind;
	if (!*argv) {
		bb_show_usage();
	}

	if (reference_file) {
		struct stat stbuf;
		xstat(reference_file, &stbuf);
		timebuf.actime = stbuf.st_atime;
		timebuf.modtime = stbuf.st_mtime;
	}

	do {
		if (utime(*argv, reference_file ? &timebuf : NULL)) {
			if (errno == ENOENT) { /* no such file */
				if (flags) { /* creation is disabled, so ignore */
					continue;
				}
				/* Try to create the file. */
				fd = open(*argv, O_RDWR | O_CREAT,
						  S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH
						  );
				if ((fd >= 0) && !close(fd)) {
					if (reference_file)
						utime(*argv, &timebuf);
					continue;
				}
			}
			status = EXIT_FAILURE;
			bb_simple_perror_msg(*argv);
		}
	} while (*++argv);

	return status;
}
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 tarball for details.
8	*/
9
10	/* BB_AUDIT SUSv3 _NOT_ compliant -- options -a, -m, -r, -t not supported. */
11	/* http://www.opengroup.org/onlinepubs/007904975/utilities/touch.html */
12
13	/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
14	*
15	* Previous version called open() and then utime(). While this will be
16	* be necessary to implement -r and -t, it currently only makes things bigger.
17	* Also, exiting on a failure was a bug. All args should be processed.
18	*/
19
20	#include "libbb.h"
21
22	/* This is a NOFORK applet. Be very careful! */
23
24	/* coreutils implements:
25	* -a change only the access time
26	* -c, --no-create
27	* do not create any files
28	* -d, --date=STRING
29	* parse STRING and use it instead of current time
30	* -f (ignored, BSD compat)
31	* -m change only the modification time
32	* -r, --reference=FILE
33	* use this file's times instead of current time
34	* -t STAMP
35	* use [[CC]YY]MMDDhhmm[.ss] instead of current time
36	* --time=WORD
37	* change the specified time: WORD is access, atime, or use
38	*/
39
40	int touch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
41	int touch_main(int argc UNUSED_PARAM, char **argv)
42	{
43	#if ENABLE_DESKTOP
44	struct utimbuf timebuf;
45	char *reference_file = NULL;
46	#else
47	#define reference_file NULL
48	#define timebuf ((struct utimbuf)NULL)
49	#endif
50	int fd;
51	int status = EXIT_SUCCESS;
52	int flags = getopt32(argv, "c" USE_DESKTOP("r:")
53	/ignored:/ "fma"
54	USE_DESKTOP(, &reference_file));
55
56	flags &= 1; /* only -c bit is left */
57	argv += optind;
58	if (!*argv) {
59	bb_show_usage();
60	}
61
62	if (reference_file) {
63	struct stat stbuf;
64	xstat(reference_file, &stbuf);
65	timebuf.actime = stbuf.st_atime;
66	timebuf.modtime = stbuf.st_mtime;
67	}
68
69	do {
70	if (utime(*argv, reference_file ? &timebuf : NULL)) {
71	if (errno == ENOENT) { /* no such file */
72	if (flags) { /* creation is disabled, so ignore */
73	continue;
74	}
75	/* Try to create the file. */
76	fd = open(*argv, O_RDWR \| O_CREAT,
77	S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IWGRP \| S_IROTH \| S_IWOTH
78	);
79	if ((fd >= 0) && !close(fd)) {
80	if (reference_file)
81	utime(*argv, &timebuf);
82	continue;
83	}
84	}
85	status = EXIT_FAILURE;
86	bb_simple_perror_msg(*argv);
87	}
88	} while (*++argv);
89
90	return status;
91	}