format-patch: rfc2047-encode newlines in headers

These should generally never happen, as we already
concatenate multiples in subjects into a single line. But
let's be defensive, since not encoding them means we will
output malformed headers.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/pretty.c b/pretty.c
index 0e167f463f864ca5516d2d5cf7df8595226090d7..65d20a7a2e7cafd79ff95c02cab3303ebb72351c 100644 (file)
--- a/pretty.c
+++ b/pretty.c
@@ -228,7 +228,7 @@ static void add_rfc2047(struct strbuf *sb, const char *line, int len,
 
        for (i = 0; i < len; i++) {
                int ch = line[i];
-               if (non_ascii(ch))
+               if (non_ascii(ch) || ch == '\n')
                        goto needquote;
                if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
                        goto needquote;
@@ -254,7 +254,7 @@ needquote:
                 * many programs do not understand this and just
                 * leave the underscore in place.
                 */
-               if (is_rfc2047_special(ch) || ch == ' ') {
+               if (is_rfc2047_special(ch) || ch == ' ' || ch == '\n') {
                        strbuf_addf(sb, "=%02X", ch);
                        line_len += 3;
                }