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 source tree.
   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         int fd;
  44         int status = EXIT_SUCCESS;
  45         int opts;
  46 #if ENABLE_DESKTOP
  47 # if ENABLE_LONG_OPTS
  48         static const char touch_longopts[] ALIGN1 =
  49                 /* name, has_arg, val */
  50                 "no-create\0"         No_argument       "c"
  51                 "reference\0"         Required_argument "r"
  52                 "date\0"              Required_argument "d"
  53         ;
  54 # endif
  55         char *reference_file = NULL;
  56         char *date_str = NULL;
  57         struct timeval timebuf[2];
  58         timebuf[1].tv_usec = timebuf[0].tv_usec = 0;
  59 #else
  60 # define reference_file NULL
  61 # define date_str       NULL
  62 # define timebuf        ((struct timeval*)NULL)
  63 #endif
  64
  65 #if ENABLE_DESKTOP && ENABLE_LONG_OPTS
  66         applet_long_options = touch_longopts;
  67 #endif
  68         /* -d and -t both set time. In coreutils,
  69          * accepted data format differs a bit between -d and -t.
  70          * We accept the same formats for both */
  71         opts = getopt32(argv, "c" IF_DESKTOP("r:d:t:")
  72                                 /*ignored:*/ "fma"
  73                                 IF_DESKTOP(, &reference_file)
  74                                 IF_DESKTOP(, &date_str)
  75                                 IF_DESKTOP(, &date_str)
  76         );
  77
  78         opts &= 1; /* only -c bit is left */
  79         argv += optind;
  80         if (!*argv) {
  81                 bb_show_usage();
  82         }
  83
  84         if (reference_file) {
  85                 struct stat stbuf;
  86                 xstat(reference_file, &stbuf);
  87                 timebuf[1].tv_sec = timebuf[0].tv_sec = stbuf.st_mtime;
  88         }
  89
  90         if (date_str) {
  91                 struct tm tm_time;
  92                 time_t t;
  93
  94                 //time(&t);
  95                 //localtime_r(&t, &tm_time);
  96                 memset(&tm_time, 0, sizeof(tm_time));
  97                 parse_datestr(date_str, &tm_time);
  98
  99                 /* Correct any day of week and day of year etc. fields */
 100                 tm_time.tm_isdst = -1;  /* Be sure to recheck dst */
 101                 t = validate_tm_time(date_str, &tm_time);
 102
 103                 timebuf[1].tv_sec = timebuf[0].tv_sec = t;
 104         }
 105
 106         do {
 107                 if (utimes(*argv, (reference_file || date_str) ? timebuf : NULL) != 0) {
 108                         if (errno == ENOENT) { /* no such file */
 109                                 if (opts) { /* creation is disabled, so ignore */
 110                                         continue;
 111                                 }
 112                                 /* Try to create the file */
 113                                 fd = open(*argv, O_RDWR | O_CREAT, 0666);
 114                                 if (fd >= 0) {
 115                                         xclose(fd);
 116                                         if (reference_file || date_str)
 117                                                 utimes(*argv, timebuf);
 118                                         continue;
 119                                 }
 120                         }
 121                         status = EXIT_FAILURE;
 122                         bb_simple_perror_msg(*argv);
 123                 }
 124         } while (*++argv);
 125
 126         return status;
 127 }