From 94b138a3c3d07cf5581c07536c53a97cebf885d9 Mon Sep 17 00:00:00 2001
From: Aurelien Jacobs <aurel@gnuage.org>
Date: Mon, 27 Apr 2015 00:13:23 +0200
Subject: [PATCH] wav: Stricter check for valid chunk ID.

isascii() is a superset of isalpha() and isblank() so the current
code doesn't really make sense.
Moreover, isascii(x) is just a funky and non standard way to
write x < 128.
---
 src/input/wav.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/input/wav.c b/src/input/wav.c
index 271bacef..4f36e8c4 100644
--- a/src/input/wav.c
+++ b/src/input/wav.c
@@ -165,8 +165,7 @@ static int find_data_chunk(GString *buf, int initial_offset)
 			/* Skip into the samples. */
 			return offset + 8;
 		for (i = 0; i < 4; i++) {
-			if (!isalpha(buf->str[offset + i])
-					&& !isascii(buf->str[offset + i])
+			if (!isalnum(buf->str[offset + i])
 					&& !isblank(buf->str[offset + i]))
 				/* Doesn't look like a chunk ID. */
 				return -1;