touch: implement -d --date (our own testsuite needs that)

function                                             old     new   delta
static.uname_longopts                                  -     137    +137
touch_main                                           231     360    +129
static.touch_longopts                                  -      32     +32
validate_tm_time                                       -      28     +28
packed_usage                                       26616   26624      +8
date_main                                            687     686      -1
static.longopts                                      162       -    -162
------------------------------------------------------------------------------
(add/remove: 3/1 grow/shrink: 2/1 up/down: 334/-163)          Total: 171 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 31 insertions, 11 deletions

diff --git a/coreutils/touch.c b/coreutils/touch.c
index 7d434a233..1b4a5f0ea 100644
--- a/coreutils/touch.c
+++ b/coreutils/touch.c
@@ -41,31 +41,34 @@ int touch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int touch_main(int argc UNUSED_PARAM, char **argv)
 {
 #if ENABLE_DESKTOP
-#if ENABLE_LONG_OPTS
-        static const char longopts[] ALIGN1 =
+# if ENABLE_LONG_OPTS
+        static const char touch_longopts[] ALIGN1 =
                 /* name, has_arg, val */
                 "no-create\0"         No_argument       "c"
                 "reference\0"         Required_argument "r"
+                "date\0"              Required_argument "d"
         ;
-#endif
+# endif
         struct utimbuf timebuf;
         char *reference_file = NULL;
+        char *date_str = NULL;
 #else
-#define reference_file NULL
-#define timebuf        (*(struct utimbuf*)NULL)
+# define reference_file NULL
+# define date_str       NULL
+# define timebuf        (*(struct utimbuf*)NULL)
 #endif
         int fd;
         int status = EXIT_SUCCESS;
         int opts;
 
-#if ENABLE_DESKTOP
-#if ENABLE_LONG_OPTS
-        applet_long_options = longopts;
+#if ENABLE_DESKTOP && ENABLE_LONG_OPTS
+        applet_long_options = touch_longopts;
 #endif
-#endif
-        opts = getopt32(argv, "c" IF_DESKTOP("r:")
+        opts = getopt32(argv, "c" IF_DESKTOP("r:d:")
                                 /*ignored:*/ "fma"
-                                IF_DESKTOP(, &reference_file));
+                                IF_DESKTOP(, &reference_file)
+                                IF_DESKTOP(, &date_str)
+        );
 
         opts &= 1; /* only -c bit is left */
         argv += optind;
@@ -80,6 +83,23 @@ int touch_main(int argc UNUSED_PARAM, char **argv)
                 timebuf.modtime = stbuf.st_mtime;
         }
 
+        if (date_str) {
+                struct tm tm_time;
+                time_t t;
+
+                //time(&t);
+                //localtime_r(&t, &tm_time);
+                memset(&tm_time, 0, sizeof(tm_time));
+                parse_datestr(date_str, &tm_time);
+
+                /* Correct any day of week and day of year etc. fields */
+                tm_time.tm_isdst = -1;  /* Be sure to recheck dst */
+                t = validate_tm_time(date_str, &tm_time);
+
+                timebuf.actime = t;
+                timebuf.modtime = t;
+        }
+
         do {
                 if (utime(*argv, reference_file ? &timebuf : NULL)) {
                         if (errno == ENOENT) { /* no such file */