wavpack: check last_byte in push_back_byte() method

At this moment the wavpack lib doesn't use the return value of the push_back function, which has an equivalent meaning of the return value of ungetc(). This is a lucky situation, because so far it simply returned with 1 as a hard coded value. From now on the function will return EOF on error. (This function makes exactly one byte pushable back.)

wavpack: check last_byte in push_back_byte() method
3e338da8 · Laszlo Ashin · Max Kellermann · cfd55b29 · 3e338da8
Commit 3e338da8 authored Nov 08, 2008 by Laszlo Ashin Committed by Max Kellermann Nov 08, 2008
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Showing with 6 additions and 2 deletions

wavpack_plugin.c src/decoder/wavpack_plugin.c +6 -2

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--- a/src/decoder/wavpack_plugin.c
+++ b/src/decoder/wavpack_plugin.c
@@ -408,8 +408,12 @@ wavpack_input_set_pos_rel(void *id, int32_t delta, int mode)
 static int
 wavpack_input_push_back_byte(void *id, int c)
 {
-	wpin(id)->last_byte = c;
-	return 1;
+	if (wpin(id)->last_byte == EOF) {
+		wpin(id)->last_byte = c;
+		return c;
+	} else {
+		return EOF;
+	}
 }

 static uint32_t