[PATCH] Sanitize "Subject:" and "Author:" fields to not contain control characters in notmuch-search

[Florian Friesdorf <flo@chaoflow.net>]

From: Andreas Amann <a.amann@ucc.ie>

When a Subject field contained encoded CRLF sequences, these sequences
would appear unfiltered in the output of notmuch search. This confused
the notmuch emacs interface leading to "Unexpected Output"
messages. This is now fixed by replacing all characters with ASCII
code less than 32 with a question mark.
---
 notmuch-search.c |   22 ++++++++++++++++++++--
 1 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/notmuch-search.c b/notmuch-search.c
index 5e39511..e7fc41a 100644
--- a/notmuch-search.c
+++ b/notmuch-search.c
@@ -111,6 +111,20 @@ format_item_id_text (unused (const void *ctx),
     printf ("%s%s", item_type, item_id);
 }
 
+static char *
+sanitize_string(const void *ctx, const char *str)
+{
+    char *out, *loop;
+
+    loop = out = talloc_strdup (ctx, str);
+
+    for(;*loop;loop++){
+	if ((unsigned char)(*loop) < 32)
+	    *loop = '?';
+    }
+    return out;
+}
+
 static void
 format_thread_text (const void *ctx,
 		    const char *thread_id,
@@ -120,13 +134,17 @@ format_thread_text (const void *ctx,
 		    const char *authors,
 		    const char *subject)
 {
+    void *ctx_quote = talloc_new (ctx);
+
     printf ("thread:%s %12s [%d/%d] %s; %s",
 	    thread_id,
 	    notmuch_time_relative_date (ctx, date),
 	    matched,
 	    total,
-	    authors,
-	    subject);
+	    sanitize_string(ctx_quote, authors),
+	    sanitize_string(ctx_quote, subject));
+
+    talloc_free (ctx_quote);
 }
 
 static void
-- 
1.7.5.1