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Fix circle buffer sizing

This commit is contained in:
Jeffrey Pfau 2013-10-02 00:46:19 -07:00
parent 09b4a4a29a
commit 71ec6162f1
1 changed files with 2 additions and 2 deletions
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4
src/util/circle-buffer.c
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@ -7,7 +7,7 @@ void CircleBufferInit(struct CircleBuffer* buffer, unsigned capacity) {
buffer->data = malloc(capacity); buffer->data = malloc(capacity);
buffer->capacity = capacity; buffer->capacity = capacity;
buffer->readPtr = buffer->data; buffer->readPtr = buffer->data;
buffer->writePtr = (int8_t*) buffer->data + capacity; buffer->writePtr = buffer->data;
} }
void CircleBufferDeinit(struct CircleBuffer* buffer) { void CircleBufferDeinit(struct CircleBuffer* buffer) {
@ -16,7 +16,7 @@ void CircleBufferDeinit(struct CircleBuffer* buffer) {
} }
unsigned CircleBufferSize(const struct CircleBuffer* buffer) { unsigned CircleBufferSize(const struct CircleBuffer* buffer) {
ptrdiff_t size = (int8_t*) buffer->readPtr - (int8_t*) buffer->writePtr; ptrdiff_t size = (int8_t*) buffer->writePtr - (int8_t*) buffer->readPtr;
if (size < 0) { if (size < 0) {
return buffer->capacity - size; return buffer->capacity - size;
} }