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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7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | /* BB_AUDIT SUSv3 _NOT_ compliant -- options -a, -m not supported. */
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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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20 | #include "libbb.h"
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21 |
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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_NODEREF
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30 | //config: bool "Add support for -h"
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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 have the -h option.
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35 | //config: This requires libc support for lutimes() function.
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36 | //config:
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37 | //config:config FEATURE_TOUCH_SUSV3
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38 | //config: bool "Add support for SUSV3 features (-d -t -r)"
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39 | //config: default y
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40 | //config: depends on TOUCH
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41 | //config: help
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42 | //config: Enable touch to use a reference file or a given date/time argument.
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43 |
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44 | //applet:IF_TOUCH(APPLET_NOFORK(touch, touch, BB_DIR_BIN, BB_SUID_DROP, touch))
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45 |
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46 | //kbuild:lib-$(CONFIG_TOUCH) += touch.o
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47 |
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48 | //usage:#define touch_trivial_usage
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49 | //usage: "[-c]" IF_FEATURE_TOUCH_SUSV3(" [-d DATE] [-t DATE] [-r FILE]") " FILE..."
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50 | //usage:#define touch_full_usage "\n\n"
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51 | //usage: "Update the last-modified date on the given FILE[s]\n"
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52 | //usage: "\n -c Don't create files"
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53 | //usage: IF_FEATURE_TOUCH_NODEREF(
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54 | //usage: "\n -h Don't follow links"
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55 | //usage: )
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56 | //usage: IF_FEATURE_TOUCH_SUSV3(
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57 | //usage: "\n -d DT Date/time to use"
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58 | //usage: "\n -t DT Date/time to use"
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59 | //usage: "\n -r FILE Use FILE's date/time"
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60 | //usage: )
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61 | //usage:
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62 | //usage:#define touch_example_usage
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63 | //usage: "$ ls -l /tmp/foo\n"
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64 | //usage: "/bin/ls: /tmp/foo: No such file or directory\n"
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65 | //usage: "$ touch /tmp/foo\n"
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66 | //usage: "$ ls -l /tmp/foo\n"
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67 | //usage: "-rw-rw-r-- 1 andersen andersen 0 Apr 15 01:11 /tmp/foo\n"
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68 |
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69 | /* This is a NOFORK applet. Be very careful! */
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70 |
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71 | /* coreutils implements:
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72 | * -a change only the access time
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73 | * -c, --no-create
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74 | * do not create any files
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75 | * -d, --date=STRING
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76 | * parse STRING and use it instead of current time
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77 | * -f (ignored, BSD compat)
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78 | * -m change only the modification time
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79 | * -h, --no-dereference
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80 | * -r, --reference=FILE
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81 | * use this file's times instead of current time
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82 | * -t STAMP
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83 | * use [[CC]YY]MMDDhhmm[.ss] instead of current time
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84 | * --time=WORD
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85 | * change the specified time: WORD is access, atime, or use
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86 | */
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87 |
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88 | int touch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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89 | int touch_main(int argc UNUSED_PARAM, char **argv)
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90 | {
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91 | int fd;
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92 | int status = EXIT_SUCCESS;
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93 | int opts;
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94 | enum {
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95 | OPT_c = (1 << 0),
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96 | OPT_r = (1 << 1) * ENABLE_FEATURE_TOUCH_SUSV3,
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97 | OPT_d = (1 << 2) * ENABLE_FEATURE_TOUCH_SUSV3,
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98 | OPT_t = (1 << 3) * ENABLE_FEATURE_TOUCH_SUSV3,
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99 | OPT_h = (1 << 4) * ENABLE_FEATURE_TOUCH_NODEREF,
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100 | };
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101 | #if ENABLE_FEATURE_TOUCH_SUSV3
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102 | # if ENABLE_LONG_OPTS
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103 | static const char touch_longopts[] ALIGN1 =
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104 | /* name, has_arg, val */
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105 | "no-create\0" No_argument "c"
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106 | "reference\0" Required_argument "r"
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107 | "date\0" Required_argument "d"
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108 | IF_FEATURE_TOUCH_NODEREF("no-dereference\0" No_argument "h")
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109 | ;
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110 | # endif
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111 | char *reference_file = NULL;
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112 | char *date_str = NULL;
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113 | struct timeval timebuf[2];
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114 | timebuf[1].tv_usec = timebuf[0].tv_usec = 0;
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115 | #else
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116 | # define reference_file NULL
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117 | # define date_str NULL
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118 | # define timebuf ((struct timeval*)NULL)
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119 | #endif
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120 |
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121 | #if ENABLE_FEATURE_TOUCH_SUSV3 && ENABLE_LONG_OPTS
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122 | applet_long_options = touch_longopts;
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123 | #endif
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124 | /* -d and -t both set time. In coreutils,
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125 | * accepted data format differs a bit between -d and -t.
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126 | * We accept the same formats for both */
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127 | opts = getopt32(argv, "c" IF_FEATURE_TOUCH_SUSV3("r:d:t:")
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128 | IF_FEATURE_TOUCH_NODEREF("h")
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129 | /*ignored:*/ "fma"
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130 | IF_FEATURE_TOUCH_SUSV3(, &reference_file)
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131 | IF_FEATURE_TOUCH_SUSV3(, &date_str)
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132 | IF_FEATURE_TOUCH_SUSV3(, &date_str)
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133 | );
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134 |
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135 | argv += optind;
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136 | if (!*argv) {
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137 | bb_show_usage();
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138 | }
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139 |
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140 | if (reference_file) {
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141 | struct stat stbuf;
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142 | xstat(reference_file, &stbuf);
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143 | timebuf[1].tv_sec = timebuf[0].tv_sec = stbuf.st_mtime;
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144 | /* Can use .st_mtim.tv_nsec
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145 | * (or is it .st_mtimensec?? see date.c)
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146 | * to set microseconds too.
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147 | */
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148 | }
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149 |
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150 | if (date_str) {
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151 | struct tm tm_time;
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152 | time_t t;
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153 |
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154 | //memset(&tm_time, 0, sizeof(tm_time));
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155 | /* Better than memset: makes "HH:MM" dates meaningful */
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156 | time(&t);
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157 | localtime_r(&t, &tm_time);
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158 | parse_datestr(date_str, &tm_time);
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159 |
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160 | /* Correct any day of week and day of year etc. fields */
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161 | tm_time.tm_isdst = -1; /* Be sure to recheck dst */
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162 | t = validate_tm_time(date_str, &tm_time);
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163 |
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164 | timebuf[1].tv_sec = timebuf[0].tv_sec = t;
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165 | }
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166 |
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167 | do {
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168 | int result;
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169 | result = (
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170 | #if ENABLE_FEATURE_TOUCH_NODEREF
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171 | (opts & OPT_h) ? lutimes :
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172 | #endif
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173 | utimes)(*argv, (reference_file || date_str) ? timebuf : NULL);
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174 | if (result != 0) {
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175 | if (errno == ENOENT) { /* no such file? */
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176 | if (opts & OPT_c) {
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177 | /* Creation is disabled, so ignore */
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178 | continue;
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179 | }
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180 | /* Try to create the file */
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181 | fd = open(*argv, O_RDWR | O_CREAT, 0666);
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182 | if (fd >= 0) {
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183 | xclose(fd);
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184 | if (reference_file || date_str)
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185 | utimes(*argv, timebuf);
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186 | continue;
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187 | }
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188 | }
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189 | status = EXIT_FAILURE;
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190 | bb_simple_perror_msg(*argv);
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191 | }
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192 | } while (*++argv);
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193 |
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194 | return status;
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195 | }
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