release/src/router/busybox/coreutils/touch.c

   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 #if ENABLE_GETOPT_LONG
  45         static const char longopts[] ALIGN1 =
  46                 /* name, has_arg, val */
  47                 "no-create\0"         No_argument       "c"
  48                 "reference\0"         Required_argument "r"
  49         ;
  50 #endif
  51         struct utimbuf timebuf;
  52         char *reference_file = NULL;
  53 #else
  54 #define reference_file NULL
  55 #define timebuf        (*(struct utimbuf*)NULL)
  56 #endif
  57         int fd;
  58         int status = EXIT_SUCCESS;
  59         int opts;
  60
  61 #if ENABLE_DESKTOP
  62 #if ENABLE_GETOPT_LONG
  63         applet_long_options = longopts;
  64 #endif
  65 #endif
  66         opts = getopt32(argv, "c" USE_DESKTOP("r:")
  67                                 /*ignored:*/ "fma"
  68                                 USE_DESKTOP(, &reference_file));
  69
  70         opts &= 1; /* only -c bit is left */
  71         argv += optind;
  72         if (!*argv) {
  73                 bb_show_usage();
  74         }
  75
  76         if (reference_file) {
  77                 struct stat stbuf;
  78                 xstat(reference_file, &stbuf);
  79                 timebuf.actime = stbuf.st_atime;
  80                 timebuf.modtime = stbuf.st_mtime;
  81         }
  82
  83         do {
  84                 if (utime(*argv, reference_file ? &timebuf : NULL)) {
  85                         if (errno == ENOENT) { /* no such file */
  86                                 if (opts) { /* creation is disabled, so ignore */
  87                                         continue;
  88                                 }
  89                                 /* Try to create the file. */
  90                                 fd = open(*argv, O_RDWR | O_CREAT,
  91                                                   S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH
  92                                                   );
  93                                 if ((fd >= 0) && !close(fd)) {
  94                                         if (reference_file)
  95                                                 utime(*argv, &timebuf);
  96                                         continue;
  97                                 }
  98                         }
  99                         status = EXIT_FAILURE;
 100                         bb_simple_perror_msg(*argv);
 101                 }
 102         } while (*++argv);
 103
 104         return status;
 105 }