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touch.c 5.6 KB

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  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 (5.9 kb)"
  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. //applet:IF_TOUCH(APPLET_NOFORK(touch, touch, BB_DIR_BIN, BB_SUID_DROP, touch))
  37. //kbuild:lib-$(CONFIG_TOUCH) += touch.o
  38. /* BB_AUDIT SUSv3 _NOT_ compliant -- options -a, -m not supported. */
  39. /* http://www.opengroup.org/onlinepubs/007904975/utilities/touch.html */
  40. //usage:#define touch_trivial_usage
  41. //usage: "[-c]" IF_FEATURE_TOUCH_SUSV3(" [-d DATE] [-t DATE] [-r FILE]") " FILE..."
  42. //usage:#define touch_full_usage "\n\n"
  43. //usage: "Update the last-modified date on the given FILE[s]\n"
  44. //usage: "\n -c Don't create files"
  45. //usage: IF_FEATURE_TOUCH_NODEREF(
  46. //usage: "\n -h Don't follow links"
  47. //usage: )
  48. //usage: IF_FEATURE_TOUCH_SUSV3(
  49. //usage: "\n -d DT Date/time to use"
  50. //usage: "\n -t DT Date/time to use"
  51. //usage: "\n -r FILE Use FILE's date/time"
  52. //usage: )
  53. //usage:
  54. //usage:#define touch_example_usage
  55. //usage: "$ ls -l /tmp/foo\n"
  56. //usage: "/bin/ls: /tmp/foo: No such file or directory\n"
  57. //usage: "$ touch /tmp/foo\n"
  58. //usage: "$ ls -l /tmp/foo\n"
  59. //usage: "-rw-rw-r-- 1 andersen andersen 0 Apr 15 01:11 /tmp/foo\n"
  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. * -h, --no-dereference
  69. * -r, --reference=FILE
  70. * use this file's times instead of current time
  71. * -t STAMP
  72. * use [[CC]YY]MMDDhhmm[.ss] instead of current time
  73. * --time=WORD
  74. * change the specified time: WORD is access, atime, or use
  75. */
  76. #include "libbb.h"
  77. int touch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  78. int touch_main(int argc UNUSED_PARAM, char **argv)
  79. {
  80. int fd;
  81. int status = EXIT_SUCCESS;
  82. int opts;
  83. enum {
  84. OPT_c = (1 << 0),
  85. OPT_r = (1 << 1) * ENABLE_FEATURE_TOUCH_SUSV3,
  86. OPT_d = (1 << 2) * ENABLE_FEATURE_TOUCH_SUSV3,
  87. OPT_t = (1 << 3) * ENABLE_FEATURE_TOUCH_SUSV3,
  88. OPT_h = (1 << 4) * ENABLE_FEATURE_TOUCH_NODEREF,
  89. };
  90. #if ENABLE_FEATURE_TOUCH_SUSV3
  91. # if ENABLE_LONG_OPTS
  92. static const char touch_longopts[] ALIGN1 =
  93. /* name, has_arg, val */
  94. "no-create\0" No_argument "c"
  95. "reference\0" Required_argument "r"
  96. "date\0" Required_argument "d"
  97. IF_FEATURE_TOUCH_NODEREF("no-dereference\0" No_argument "h")
  98. ;
  99. # define GETOPT32 getopt32long
  100. # define LONGOPTS ,touch_longopts
  101. # else
  102. # define GETOPT32 getopt32
  103. # define LONGOPTS
  104. # endif
  105. char *reference_file = NULL;
  106. char *date_str = NULL;
  107. struct timeval timebuf[2];
  108. timebuf[1].tv_usec = timebuf[0].tv_usec = 0;
  109. #else
  110. # define reference_file NULL
  111. # define date_str NULL
  112. # define timebuf ((struct timeval*)NULL)
  113. # define GETOPT32 getopt32
  114. # define LONGOPTS
  115. #endif
  116. /* -d and -t both set time. In coreutils,
  117. * accepted data format differs a bit between -d and -t.
  118. * We accept the same formats for both */
  119. opts = GETOPT32(argv, "c" IF_FEATURE_TOUCH_SUSV3("r:d:t:")
  120. IF_FEATURE_TOUCH_NODEREF("h")
  121. /*ignored:*/ "fma"
  122. LONGOPTS
  123. IF_FEATURE_TOUCH_SUSV3(, &reference_file)
  124. IF_FEATURE_TOUCH_SUSV3(, &date_str)
  125. IF_FEATURE_TOUCH_SUSV3(, &date_str)
  126. );
  127. argv += optind;
  128. if (!*argv) {
  129. bb_show_usage();
  130. }
  131. if (reference_file) {
  132. struct stat stbuf;
  133. xstat(reference_file, &stbuf);
  134. timebuf[1].tv_sec = timebuf[0].tv_sec = stbuf.st_mtime;
  135. /* Can use .st_mtim.tv_nsec
  136. * (or is it .st_mtimensec?? see date.c)
  137. * to set microseconds too.
  138. */
  139. }
  140. if (date_str) {
  141. struct tm tm_time;
  142. time_t t;
  143. //memset(&tm_time, 0, sizeof(tm_time));
  144. /* Better than memset: makes "HH:MM" dates meaningful */
  145. time(&t);
  146. localtime_r(&t, &tm_time);
  147. parse_datestr(date_str, &tm_time);
  148. /* Correct any day of week and day of year etc. fields */
  149. tm_time.tm_isdst = -1; /* Be sure to recheck dst */
  150. t = validate_tm_time(date_str, &tm_time);
  151. timebuf[1].tv_sec = timebuf[0].tv_sec = t;
  152. }
  153. do {
  154. int result;
  155. result = (
  156. #if ENABLE_FEATURE_TOUCH_NODEREF
  157. (opts & OPT_h) ? lutimes :
  158. #endif
  159. utimes)(*argv, (reference_file || date_str) ? timebuf : NULL);
  160. if (result != 0) {
  161. if (errno == ENOENT) { /* no such file? */
  162. if (opts & OPT_c) {
  163. /* Creation is disabled, so ignore */
  164. continue;
  165. }
  166. /* Try to create the file */
  167. fd = open(*argv, O_RDWR | O_CREAT, 0666);
  168. if (fd >= 0) {
  169. xclose(fd);
  170. if (reference_file || date_str)
  171. utimes(*argv, timebuf);
  172. continue;
  173. }
  174. }
  175. status = EXIT_FAILURE;
  176. bb_simple_perror_msg(*argv);
  177. }
  178. } while (*++argv);
  179. return status;
  180. }