source: branches/3.2/mindi-busybox/coreutils/touch.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 4.7 KB
Line 
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
10/* BB_AUDIT SUSv3 _NOT_ compliant -- options -a, -m 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//config:config TOUCH
23//config:   bool "touch"
24//config:   default y
25//config:   help
26//config:     touch is used to create or change the access and/or
27//config:     modification timestamp of specified files.
28//config:
29//config:config FEATURE_TOUCH_SUSV3
30//config:   bool "Add support for SUSV3 features (-d -t -r)"
31//config:   default y
32//config:   depends on TOUCH
33//config:   help
34//config:     Enable touch to use a reference file or a given date/time argument.
35
36//applet:IF_TOUCH(APPLET_NOFORK(touch, touch, BB_DIR_BIN, BB_SUID_DROP, touch))
37
38//kbuild:lib-$(CONFIG_TOUCH) += touch.o
39
40//usage:#define touch_trivial_usage
41//usage:       "[-c]" IF_FEATURE_TOUCH_SUSV3(" [-d DATE] [-t DATE] [-r FILE]") " FILE..."
42//usage:#define touch_full_usage "\n\n"
43//usage:       "Update the last-modified date on the given FILE[s]\n"
44//usage:     "\n    -c  Don't create files"
45//usage:    IF_FEATURE_TOUCH_SUSV3(
46//usage:     "\n    -d DT   Date/time to use"
47//usage:     "\n    -t DT   Date/time to use"
48//usage:     "\n    -r FILE Use FILE's date/time"
49//usage:    )
50//usage:
51//usage:#define touch_example_usage
52//usage:       "$ ls -l /tmp/foo\n"
53//usage:       "/bin/ls: /tmp/foo: No such file or directory\n"
54//usage:       "$ touch /tmp/foo\n"
55//usage:       "$ ls -l /tmp/foo\n"
56//usage:       "-rw-rw-r--    1 andersen andersen        0 Apr 15 01:11 /tmp/foo\n"
57
58/* This is a NOFORK applet. Be very careful! */
59
60/* coreutils implements:
61 * -a   change only the access time
62 * -c, --no-create
63 *      do not create any files
64 * -d, --date=STRING
65 *      parse STRING and use it instead of current time
66 * -f   (ignored, BSD compat)
67 * -m   change only the modification time
68 * -r, --reference=FILE
69 *      use this file's times instead of current time
70 * -t STAMP
71 *      use [[CC]YY]MMDDhhmm[.ss] instead of current time
72 * --time=WORD
73 *      change the specified time: WORD is access, atime, or use
74 */
75
76int touch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
77int touch_main(int argc UNUSED_PARAM, char **argv)
78{
79    int fd;
80    int status = EXIT_SUCCESS;
81    int opts;
82#if ENABLE_FEATURE_TOUCH_SUSV3
83# if ENABLE_LONG_OPTS
84    static const char touch_longopts[] ALIGN1 =
85        /* name, has_arg, val */
86        "no-create\0"         No_argument       "c"
87        "reference\0"         Required_argument "r"
88        "date\0"              Required_argument "d"
89    ;
90# endif
91    char *reference_file = NULL;
92    char *date_str = NULL;
93    struct timeval timebuf[2];
94    timebuf[1].tv_usec = timebuf[0].tv_usec = 0;
95#else
96# define reference_file NULL
97# define date_str       NULL
98# define timebuf        ((struct timeval*)NULL)
99#endif
100
101#if ENABLE_FEATURE_TOUCH_SUSV3 && ENABLE_LONG_OPTS
102    applet_long_options = touch_longopts;
103#endif
104    /* -d and -t both set time. In coreutils,
105     * accepted data format differs a bit between -d and -t.
106     * We accept the same formats for both */
107    opts = getopt32(argv, "c" IF_FEATURE_TOUCH_SUSV3("r:d:t:")
108                /*ignored:*/ "fma"
109                IF_FEATURE_TOUCH_SUSV3(, &reference_file)
110                IF_FEATURE_TOUCH_SUSV3(, &date_str)
111                IF_FEATURE_TOUCH_SUSV3(, &date_str)
112    );
113
114    opts &= 1; /* only -c bit is left */
115    argv += optind;
116    if (!*argv) {
117        bb_show_usage();
118    }
119
120    if (reference_file) {
121        struct stat stbuf;
122        xstat(reference_file, &stbuf);
123        timebuf[1].tv_sec = timebuf[0].tv_sec = stbuf.st_mtime;
124    }
125
126    if (date_str) {
127        struct tm tm_time;
128        time_t t;
129
130        //memset(&tm_time, 0, sizeof(tm_time));
131        /* Better than memset: makes "HH:MM" dates meaningful */
132        time(&t);
133        localtime_r(&t, &tm_time);
134        parse_datestr(date_str, &tm_time);
135
136        /* Correct any day of week and day of year etc. fields */
137        tm_time.tm_isdst = -1;  /* Be sure to recheck dst */
138        t = validate_tm_time(date_str, &tm_time);
139
140        timebuf[1].tv_sec = timebuf[0].tv_sec = t;
141    }
142
143    do {
144        if (utimes(*argv, (reference_file || date_str) ? timebuf : NULL) != 0) {
145            if (errno == ENOENT) { /* no such file */
146                if (opts) { /* creation is disabled, so ignore */
147                    continue;
148                }
149                /* Try to create the file */
150                fd = open(*argv, O_RDWR | O_CREAT, 0666);
151                if (fd >= 0) {
152                    xclose(fd);
153                    if (reference_file || date_str)
154                        utimes(*argv, timebuf);
155                    continue;
156                }
157            }
158            status = EXIT_FAILURE;
159            bb_simple_perror_msg(*argv);
160        }
161    } while (*++argv);
162
163    return status;
164}
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