[PATCH] NUL terminate diff-tree header lines under -z.

Thomas Glanzmann noticed that diff-tree -z HEAD piped to
diff-helper -z did not work.  Since diff-helper -z expects NUL
terminated lines, we should generate such.

The output side of the diff-helper should always be using '\n'
termination; earlier it used the same line_termination used for
the input side, which was a mistake.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff-helper.c

@@ -121,7 +121,7 @@ int main(int ac, const char **av) {
 		if (status) {
 		unrecognized:
 			diff_flush(diff_output_style);
-			printf("%s%c", sb1.buf, line_termination);
+			printf("%s\n", sb1.buf);
 		}
 	}
 	if (detect_rename)

diff-tree.c

@@ -277,7 +277,18 @@ static int call_diff_flush(void)
 	if (nr_paths)
 		diffcore_pathspec(paths);
 	if (header) {
-		printf("%s", header);
+		if (diff_output_format == DIFF_FORMAT_MACHINE) {
+			const char *ep, *cp;
+			for (cp = header; *cp; cp = ep) {
+				ep = strchr(cp, '\n');
+				if (ep == 0) ep = cp + strlen(cp);
+				printf("%.*s%c", ep-cp, cp, 0);
+				if (*ep) ep++;
+			}
+		}
+		else {
+			printf("%s", header);
+		}
 		header = NULL;
 	}
 	diff_flush(diff_output_format);