[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini touch implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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[2725] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 8 | */
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| 9 |
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[3232] | 10 | /* BB_AUDIT SUSv3 _NOT_ compliant -- options -a, -m not supported. */
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[821] | 11 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/touch.html */
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| 12 |
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| 13 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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| 14 | *
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| 15 | * Previous version called open() and then utime(). While this will be
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| 16 | * be necessary to implement -r and -t, it currently only makes things bigger.
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| 17 | * Also, exiting on a failure was a bug. All args should be processed.
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| 18 | */
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| 19 |
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[1765] | 20 | #include "libbb.h"
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[821] | 21 |
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[3232] | 22 | //config:config TOUCH
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| 23 | //config: bool "touch"
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| 24 | //config: default y
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| 25 | //config: help
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| 26 | //config: touch is used to create or change the access and/or
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| 27 | //config: modification timestamp of specified files.
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| 28 | //config:
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| 29 | //config:config FEATURE_TOUCH_SUSV3
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| 30 | //config: bool "Add support for SUSV3 features (-d -t -r)"
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| 31 | //config: default y
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| 32 | //config: depends on TOUCH
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| 33 | //config: help
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| 34 | //config: Enable touch to use a reference file or a given date/time argument.
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| 35 |
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| 36 | //applet:IF_TOUCH(APPLET_NOFORK(touch, touch, BB_DIR_BIN, BB_SUID_DROP, touch))
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| 37 |
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| 38 | //kbuild:lib-$(CONFIG_TOUCH) += touch.o
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| 39 |
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| 40 | //usage:#define touch_trivial_usage
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| 41 | //usage: "[-c]" IF_FEATURE_TOUCH_SUSV3(" [-d DATE] [-t DATE] [-r FILE]") " FILE..."
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| 42 | //usage:#define touch_full_usage "\n\n"
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| 43 | //usage: "Update the last-modified date on the given FILE[s]\n"
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| 44 | //usage: "\n -c Don't create files"
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| 45 | //usage: IF_FEATURE_TOUCH_SUSV3(
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| 46 | //usage: "\n -d DT Date/time to use"
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| 47 | //usage: "\n -t DT Date/time to use"
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| 48 | //usage: "\n -r FILE Use FILE's date/time"
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| 49 | //usage: )
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| 50 | //usage:
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| 51 | //usage:#define touch_example_usage
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| 52 | //usage: "$ ls -l /tmp/foo\n"
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| 53 | //usage: "/bin/ls: /tmp/foo: No such file or directory\n"
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| 54 | //usage: "$ touch /tmp/foo\n"
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| 55 | //usage: "$ ls -l /tmp/foo\n"
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| 56 | //usage: "-rw-rw-r-- 1 andersen andersen 0 Apr 15 01:11 /tmp/foo\n"
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| 57 |
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[1765] | 58 | /* This is a NOFORK applet. Be very careful! */
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| 59 |
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[2725] | 60 | /* coreutils implements:
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| 61 | * -a change only the access time
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| 62 | * -c, --no-create
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| 63 | * do not create any files
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| 64 | * -d, --date=STRING
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| 65 | * parse STRING and use it instead of current time
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| 66 | * -f (ignored, BSD compat)
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| 67 | * -m change only the modification time
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| 68 | * -r, --reference=FILE
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| 69 | * use this file's times instead of current time
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| 70 | * -t STAMP
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| 71 | * use [[CC]YY]MMDDhhmm[.ss] instead of current time
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| 72 | * --time=WORD
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| 73 | * change the specified time: WORD is access, atime, or use
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| 74 | */
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| 75 |
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| 76 | int touch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 77 | int touch_main(int argc UNUSED_PARAM, char **argv)
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[821] | 78 | {
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| 79 | int fd;
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| 80 | int status = EXIT_SUCCESS;
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[2725] | 81 | int opts;
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[3232] | 82 | #if ENABLE_FEATURE_TOUCH_SUSV3
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[2725] | 83 | # if ENABLE_LONG_OPTS
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| 84 | static const char touch_longopts[] ALIGN1 =
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| 85 | /* name, has_arg, val */
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| 86 | "no-create\0" No_argument "c"
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| 87 | "reference\0" Required_argument "r"
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| 88 | "date\0" Required_argument "d"
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| 89 | ;
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| 90 | # endif
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| 91 | char *reference_file = NULL;
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| 92 | char *date_str = NULL;
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| 93 | struct timeval timebuf[2];
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| 94 | timebuf[1].tv_usec = timebuf[0].tv_usec = 0;
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| 95 | #else
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| 96 | # define reference_file NULL
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| 97 | # define date_str NULL
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| 98 | # define timebuf ((struct timeval*)NULL)
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| 99 | #endif
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[821] | 100 |
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[3232] | 101 | #if ENABLE_FEATURE_TOUCH_SUSV3 && ENABLE_LONG_OPTS
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[2725] | 102 | applet_long_options = touch_longopts;
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| 103 | #endif
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| 104 | /* -d and -t both set time. In coreutils,
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| 105 | * accepted data format differs a bit between -d and -t.
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| 106 | * We accept the same formats for both */
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[3232] | 107 | opts = getopt32(argv, "c" IF_FEATURE_TOUCH_SUSV3("r:d:t:")
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[2725] | 108 | /*ignored:*/ "fma"
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[3232] | 109 | IF_FEATURE_TOUCH_SUSV3(, &reference_file)
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| 110 | IF_FEATURE_TOUCH_SUSV3(, &date_str)
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| 111 | IF_FEATURE_TOUCH_SUSV3(, &date_str)
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[2725] | 112 | );
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| 113 |
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| 114 | opts &= 1; /* only -c bit is left */
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[821] | 115 | argv += optind;
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| 116 | if (!*argv) {
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| 117 | bb_show_usage();
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| 118 | }
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| 119 |
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[2725] | 120 | if (reference_file) {
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| 121 | struct stat stbuf;
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| 122 | xstat(reference_file, &stbuf);
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| 123 | timebuf[1].tv_sec = timebuf[0].tv_sec = stbuf.st_mtime;
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| 124 | }
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| 125 |
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| 126 | if (date_str) {
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| 127 | struct tm tm_time;
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| 128 | time_t t;
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| 129 |
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[3232] | 130 | //memset(&tm_time, 0, sizeof(tm_time));
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| 131 | /* Better than memset: makes "HH:MM" dates meaningful */
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| 132 | time(&t);
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| 133 | localtime_r(&t, &tm_time);
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[2725] | 134 | parse_datestr(date_str, &tm_time);
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| 135 |
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| 136 | /* Correct any day of week and day of year etc. fields */
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| 137 | tm_time.tm_isdst = -1; /* Be sure to recheck dst */
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| 138 | t = validate_tm_time(date_str, &tm_time);
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| 139 |
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| 140 | timebuf[1].tv_sec = timebuf[0].tv_sec = t;
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| 141 | }
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| 142 |
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[821] | 143 | do {
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[2725] | 144 | if (utimes(*argv, (reference_file || date_str) ? timebuf : NULL) != 0) {
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| 145 | if (errno == ENOENT) { /* no such file */
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| 146 | if (opts) { /* creation is disabled, so ignore */
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[821] | 147 | continue;
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| 148 | }
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[2725] | 149 | /* Try to create the file */
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| 150 | fd = open(*argv, O_RDWR | O_CREAT, 0666);
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| 151 | if (fd >= 0) {
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| 152 | xclose(fd);
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| 153 | if (reference_file || date_str)
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| 154 | utimes(*argv, timebuf);
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[821] | 155 | continue;
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| 156 | }
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| 157 | }
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| 158 | status = EXIT_FAILURE;
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[2725] | 159 | bb_simple_perror_msg(*argv);
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[821] | 160 | }
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| 161 | } while (*++argv);
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| 162 |
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| 163 | return status;
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| 164 | }
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