From 5b68f6e43d7d8d07cbb8825c9520c20eaeac64b6 Mon Sep 17 00:00:00 2001
From: Philip Hazel <ph10@hermes.cam.ac.uk>
Date: Mon, 1 Aug 2005 13:51:05 +0000
Subject: [PATCH] Use fseek() instead of fread() to skip the body file header
 line, so that the code will run in Cygwin.

---
 doc/doc-txt/ChangeLog |  6 +++++-
 src/src/spool_mbox.c  | 16 ++++++++++++++--
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index e61046715..fa5a05123 100644
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -1,4 +1,4 @@
-$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.184 2005/08/01 13:28:30 ph10 Exp $
+$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.185 2005/08/01 13:51:05 ph10 Exp $
 
 Change log file for Exim from version 4.21
 -------------------------------------------
@@ -13,6 +13,10 @@ PH/01 Added support for SQLite, basic code supplied by David Woodhouse.
 
 PH/02 Patch to exigrep to allow it to work on syslog lines.
 
+PH/03 When creating an mbox file for a virus/spam scan, use fseek() instead of
+      fread() to skip over the body file's header line, because in Cygwin the
+      header line is locked and is inaccessible.
+
 
 Exim version 4.52
 -----------------
diff --git a/src/src/spool_mbox.c b/src/src/spool_mbox.c
index dd5d73b7a..af9a46b84 100644
--- a/src/src/spool_mbox.c
+++ b/src/src/spool_mbox.c
@@ -1,4 +1,4 @@
-/* $Cambridge: exim/src/src/spool_mbox.c,v 1.8 2005/07/01 10:49:02 ph10 Exp $ */
+/* $Cambridge: exim/src/src/spool_mbox.c,v 1.9 2005/08/01 13:51:05 ph10 Exp $ */
 
 /*************************************************
 *     Exim - an Internet mail transport agent    *
@@ -134,10 +134,22 @@ FILE *spool_mbox(unsigned long *mbox_file_size) {
         break;
     };
 
-    (void)fread(data_buffer, 1, 18, data_file);
+    /* The code used to use this line, but it doesn't work in Cygwin.
+     *
+     *  (void)fread(data_buffer, 1, 18, data_file);
+     *
+     * What's happening is that spool_mbox used to use an fread to jump over the
+     * file header. That fails under Cygwin because the header is locked, but
+     * doing an fseek succeeds. We have to output the leading newline
+     * explicitly, because the one in the file is parted of the locked area.
+     */
+
+    (void)fwrite("\n", 1, 1, mbox_file);
+    (void)fseek(data_file, SPOOL_DATA_START_OFFSET, SEEK_SET);
 
     do {
       j = fread(data_buffer, 1, sizeof(data_buffer), data_file);
+
       if (j > 0) {
         i = fwrite(data_buffer, 1, j, mbox_file);
         if (i != j) {
-- 
2.30.2