coreutils/diff: support /dev/null

1 files changed, 12 insertions, 1 deletions

diff --git a/coreutils/diff.c b/coreutils/diff.c
index f0e298797..7599273c8 100644
--- a/coreutils/diff.c
+++ b/coreutils/diff.c
@@ -1174,6 +1174,7 @@ int diff_main(int argc, char **argv)
         char *U_opt;
         char *f1, *f2;
         llist_t *L_arg = NULL;
+        int flags = 0;
 
         /* exactly 2 params; collect multiple -L <label> */
         opt_complementary = "=2:L::";
@@ -1207,11 +1208,21 @@ int diff_main(int argc, char **argv)
         if (LONE_DASH(f1)) {
                 fstat(STDIN_FILENO, &stb1);
                 gotstdin = 1;
+#ifdef __MINGW32__
+        } else if ( !strncmp( f1, "/dev/null", 10 ) ) {
+                flags |= D_EMPTY1;
+                stb1.st_mode = S_IFREG;
+#endif
         } else
                 xstat(f1, &stb1);
         if (LONE_DASH(f2)) {
                 fstat(STDIN_FILENO, &stb2);
                 gotstdin = 1;
+#ifdef __MINGW32__
+        } else if ( !strncmp( f2, "/dev/null", 10 ) ) {
+                flags |= D_EMPTY2;
+                stb2.st_mode = S_IFREG;
+#endif
         } else
                 xstat(f2, &stb2);
         if (gotstdin && (S_ISDIR(stb1.st_mode) || S_ISDIR(stb2.st_mode)))
@@ -1236,7 +1247,7 @@ int diff_main(int argc, char **argv)
  * This can be fixed (volunteers?) */
                 if (!S_ISREG(stb1.st_mode) || !S_ISREG(stb2.st_mode))
                         bb_error_msg_and_die("can't diff non-seekable stream");
-                print_status(diffreg(f1, f2, 0), f1, f2, NULL);
+                print_status(diffreg(f1, f2, flags), f1, f2, NULL);
         }
         return status;
 }