pretty.c: add %x00 format specifier.

This adds a %xXX format which inserts two hexdigits after %x as a byte
value in the resulting string.  This can be used to add a NUL byte or any
other byte that can make machine parsing easier.  It is also necessary to
use fwrite to print out the data since printf will terminate if you feed
it a NUL.

Signed-off-by: Govind Salinas <blix@sophiasuchtig.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/log-tree.c b/log-tree.c
index 5b29639..9d54061 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -317,8 +317,10 @@ void show_log(struct rev_info *opt, const char *sep)
 	if (opt->show_log_size)
 		printf("log size %i\n", (int)msgbuf.len);
 
-	if (msgbuf.len)
-		printf("%s%s%s", msgbuf.buf, extra, sep);
+	if (msgbuf.len) {
+		fwrite(msgbuf.buf, sizeof(char), msgbuf.len, stdout);
+		printf("%s%s", extra, sep);
+	}
 	strbuf_release(&msgbuf);
 }