Handle exceptional sizes of diff output

With large output of diff or sdiff, the pipe buffers used to
communicate with debconf fill up. So now we limit the maximu size to
jusr under 100k. Also, we were unable to handle whitespace only
differences (which show up empty); this change fixes that too.

Signed-off-by: Manoj Srivastava <srivasta@debian.org>

1 files changed, 7 insertions, 3 deletions

diff --git a/ucf b/ucf
index 22ffb7d..a20f3c0 100755
--- a/ucf
+++ b/ucf
@@ -60,10 +60,14 @@ setq() {
 # Use debconf to show the differences
 show_diff() {
     if [ -z "$1" ]; then
-	echo >&2 "need a diff as argument"
-	exit 1;
+	DIFF="There are no non-white space differences in the files."
+    else
+        if  [ 99999 -lt $(echo $l | wc -c | awk '{print $1; }') ]; then
+            DIFF="The differences between the files are too large to display."
+        else
+            DIFF="$1"
+        fi
     fi
-    DIFF="$1"
     if [ "$DEBCONF_OK" = "YES" ] && [ "$DEBIAN_HAS_FRONTEND" ]; then
 	templ=ucf/show_diff
 	db_capb escape