From df9141a4384f3a85c31b1f35fd76c9260776c254 Mon Sep 17 00:00:00 2001
From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Date: Wed, 22 Apr 2009 22:31:04 +1000
Subject: coreutils/diff: support /dev/null

---
 coreutils/diff.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

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;
 }
-- 
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