[exim] Exim-Filter: Increase maximum permitted length of a d…

Hi.

I would like to (safely) increase the maximum permitted length of a
data string in filter commands. In our setup, the options to the
"vacation" cmd are read from an sql database and some users requested
to have a vacation message longer than 1024 chars.

I figured out that everything works fine if I increase the buffer size
in src/filter.c (please see the patch below). I'm quite unsure if this
might have any side effects.

Chris

--- src/filter.c.orig   2006-07-31 16:19:48.000000000 +0200
+++ src/filter.c        2007-09-24 11:52:23.000000000 +0200
@@ -420,7 +420,7 @@
 static uschar *
 read_condition(uschar *ptr, condition_block **cond, BOOL toplevel)
 {
-uschar buffer[1024];
+uschar buffer[4096];
 BOOL testfor = TRUE;
 condition_block *current_parent = NULL;
 condition_block **current = cond;
@@ -853,7 +853,7 @@
 BOOL yield = TRUE;
 BOOL was_seen_or_unseen = FALSE;
 BOOL was_noerror = FALSE;
-uschar buffer[1024];
+uschar buffer[4096];
 uschar *ptr = *pptr;
 uschar *saveptr;
 uschar *fmsg = NULL;