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audio/flacdec: handle read errors properly to avoid endless looping saturating cpu

--- a/sys/src/cmd/audio/flacdec/flacdec.c

+++ b/sys/src/cmd/audio/flacdec/flacdec.c

@@ -25,10 +25,11 @@

 	int n = *bytes;

 	n = fread(buffer, 1, n, stdin);

-	if(n < 0)

+	if(n < 1){

+		if(feof(stdin))

+			return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;

 		return FLAC__STREAM_DECODER_READ_STATUS_ABORT;

-	if(n == 0)

-		return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;

+	}

 	*bytes = n;

 	return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;

-- 

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