[balsa] Fix endless loop

[Peter Bloomfield <PeterB src gnome org>]

commit db5fb04eea896113808fcae97899825d56093032
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Fri Feb 5 20:26:30 2010 -0500

    Fix endless loop
    
    	* libbalsa/mime.c (libbalsa_match_regex): do not loop
    	indefinitely when regex matches zero characters.

 ChangeLog       |    5 +++++
 libbalsa/mime.c |    3 ++-
 2 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 3335e55..9d869cc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2010-02-05  Peter Bloomfield
+
+	* libbalsa/mime.c (libbalsa_match_regex): do not loop
+	indefinitely when regex matches zero characters.
+
 2010-02-05  Pawel Salek
 
 	* libbalsa/imap/imap_compress.c: reduce the compressed stream
diff --git a/libbalsa/mime.c b/libbalsa/mime.c
index ec5eb94..0bd052e 100644
--- a/libbalsa/mime.c
+++ b/libbalsa/mime.c
@@ -1325,7 +1325,8 @@ libbalsa_match_regex(const gchar * line, regex_t * rex, guint * count,
     const gchar *p;
 
     c = 0;
-    for (p = line; regexec(rex, p, 1, &rm, 0) == 0; p += rm.rm_eo)
+    for (p = line; !regexec(rex, p, 1, &rm, 0) && rm.rm_eo > 0;
+         p += rm.rm_eo)
 	c++;
     if (count)
 	*count = c;