环形buffer有问题

[weixuechao2018]

当数据写到buffer尾部时，如果队尾如果在写数据有问题

[weixuechao2018]

ssize_t rb_write(struct ringbuffer *rb, const void *buf, size_t len)
{
if (!rb) {
return -1;
}
int left = rb_get_space_free(rb);
if ((int)len > left) {
printf("Not enough space: %zu request, %d available\n", len, left);
return -1;
}
// 这里修改过
#if 1
if((rb->length - rb->end) < len) {
int firstLen = rb->length - rb->end;
memcpy(rb_end_ptr(rb), buf, firstLen);
rb->end = (rb->end + firstLen) % rb->length;

    int secondLen = len - firstLen;
    memcpy(rb_end_ptr(rb), buf+firstLen, secondLen);
    rb->end = (rb->end + secondLen) % rb->length;
} else {
    memcpy(rb_end_ptr(rb), buf, len);
    rb->end = (rb->end + len) % rb->length;
}

#else
memcpy(rb_end_ptr(rb), buf, len);
rb->end = (rb->end + len) % rb->length;
#endif

return len;

}
这样改的，我测试了可以循环写，不知道对不对

[gozfree]

非常感谢，你是对的，已经fix了
b916cf6