ossp-pkg/sio/al.c 1.32 -> 1.33
--- al.c 2002/10/25 13:29:02 1.32
+++ al.c 2002/11/04 13:14:50 1.33
@@ -137,17 +137,29 @@
* number of bytes a chunk can be grown to the beginning
* we must not grow a chunk in a shared buffer since
* we do not track other chunks sharing the buffer
+ *
+ * empty chunks can be aligned with end
*/
#define AL_CHUNK_PRESERVE(alc,label) \
( (alc) != NULL \
? ( (alc)->buf->usecount > 1 || !AL_SAME_LABEL(alc,label) \
? 0 \
- : (alc)->begin) \
+ : (alc)->end <= (alc)->begin ? \
+ (alc)->buf->size \
+ : (alc)->begin) \
: 0)
-/* grow chunk to the beginning */
+/*
+ * grow chunk to the beginning
+ *
+ * empty chunks can be aligned with end
+ */
#define AL_PRESIZE(al, alc, n) \
- do { (alc)->begin -= n; (al)->bytes += (n); } while (0)
+ do { \
+ if ((alc)->end <= (alc)->begin) \
+ (alc)->end = (alc)->begin = (alc)->buf->size; \
+ (alc)->begin -= n; (al)->bytes += (n); \
+ } while (0)
/*
* callback to release buffer memory allocated by the library
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