touch: prevent usage of -r and -t at once

coreutils forbids this combination.

Signed-off-by: Xabier Oneca <xoneca@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 11 insertions, 7 deletions

diff --git a/coreutils/touch.c b/coreutils/touch.c
index 8d3f8dbbe..189428a79 100644
--- a/coreutils/touch.c
+++ b/coreutils/touch.c
@@ -120,14 +120,18 @@ int touch_main(int argc UNUSED_PARAM, char **argv)
          * accepted data format differs a bit between -d and -t.
          * We accept the same formats for both
          */
-        opts = getopt32long(argv, "c" IF_FEATURE_TOUCH_NODEREF("h")
-                                IF_FEATURE_TOUCH_SUSV3("r:d:t:am")
-                                /*ignored:*/ "f" IF_NOT_FEATURE_TOUCH_SUSV3("am"),
-                                touch_longopts
+        opts = getopt32long(argv, "^"
+                "c" IF_FEATURE_TOUCH_NODEREF("h")
+                IF_FEATURE_TOUCH_SUSV3("r:d:t:am")
+                /*ignored:*/ "f" IF_NOT_FEATURE_TOUCH_SUSV3("am")
+                "\0" /* opt_complementary: */
+                /* coreutils forbids -r and -t at once: */ IF_FEATURE_TOUCH_SUSV3("r--t:t--r")
+                /* but allows these combinations: "r--d:d--r:t--d:d--t" */,
+                touch_longopts
 #if ENABLE_FEATURE_TOUCH_SUSV3
-                                , &reference_file
-                                , &date_str
-                                , &date_str
+                , &reference_file
+                , &date_str
+                , &date_str
 #endif
         );