jschar *
StringBuffer::extractWellSized()
{
size_t capacity = cb.capacity();
size_t length = cb.length();
jschar *buf = cb.extractRawBuffer();
if (!buf)
return NULL;
/* For medium/big buffers, avoid wasting more than 1/4 of the memory. */
JS_ASSERT(capacity >= length);
if (length > CharBuffer::sMaxInlineStorage && capacity - length > length / 4) {
size_t bytes = sizeof(jschar) * (length + 1);
JSContext *cx = context();
jschar *tmp = (jschar *)cx->realloc_(buf, bytes);
if (!tmp) {
js_free(buf);
return NULL;
}
buf = tmp;
}
return buf;
}
