Add the -r option, patch from Rob with some help from myself.

diff --git a/coreutils/date.c b/coreutils/date.c
index 1aa3e22d23d413e49196f04dbede0421a5715ce9..a6b595e57a83e73c0fbd2d9de59a32589cd0705b 100644 (file)
--- a/coreutils/date.c
+++ b/coreutils/date.c
@@ -118,8 +118,9 @@ static struct tm *date_conv_ftime(struct tm *tm_time, const char *t_string)
 #define DATE_OPT_SET           0x02
 #define DATE_OPT_UTC           0x04
 #define DATE_OPT_DATE          0x08
+#define DATE_OPT_REFERENCE     0x10
 #ifdef CONFIG_FEATURE_DATE_ISOFMT
-# define DATE_OPT_TIMESPEC     0x10
+# define DATE_OPT_TIMESPEC     0x20
 #endif
 
 int date_main(int argc, char **argv)
@@ -133,6 +134,7 @@ int date_main(int argc, char **argv)
        time_t tm;
        unsigned long opt;
        struct tm tm_time;
+       char *filename = NULL;
 
 #ifdef CONFIG_FEATURE_DATE_ISOFMT
        int ifmt = 0;
@@ -143,8 +145,8 @@ int date_main(int argc, char **argv)
 # define GETOPT_ISOFMT
 #endif
        bb_opt_complementaly = "d~ds:s~ds";
-       opt = bb_getopt_ulflags(argc, argv, "Rs:ud:" GETOPT_ISOFMT,
-                                       &date_str, &date_str
+       opt = bb_getopt_ulflags(argc, argv, "Rs:ud:r:" GETOPT_ISOFMT,
+                                       &date_str, &date_str, &filename
 #ifdef CONFIG_FEATURE_DATE_ISOFMT
                                        , &isofmt_arg
 #endif
@@ -194,7 +196,12 @@ int date_main(int argc, char **argv)
        /* Now we have parsed all the information except the date format
           which depends on whether the clock is being set or read */
 
-       time(&tm);
+       if(filename) {
+               struct stat statbuf;
+               if(stat(filename,&statbuf))
+                       bb_perror_msg_and_die("File '%s' not found.\n",filename);
+               tm=statbuf.st_mtime;
+       } else time(&tm);
        memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
        /* Zero out fields - take her back to midnight! */
        if (date_str != NULL) {