Function _addReplyProtoToList

app/redis-6.2.6/src/networking.c:312–347

Adds the reply to the reply linked list. * Note: some edits to this function need to be relayed to AddReplyFromClient. */

/* Adds the reply to the reply linked list.
 * Note: some edits to this function need to be relayed to AddReplyFromClient. */
void _addReplyProtoToList(client *c, const char *s, size_t len) {
    if (c->flags & CLIENT_CLOSE_AFTER_REPLY) return;

    listNode *ln = listLast(c->reply);
    clientReplyBlock *tail = ln? listNodeValue(ln): NULL;

    /* Note that 'tail' may be NULL even if we have a tail node, because when
     * addReplyDeferredLen() is used, it sets a dummy node to NULL just
     * fo fill it later, when the size of the bulk length is set. */

    /* Append to tail string when possible. */
    if (tail) {
        /* Copy the part we can fit into the tail, and leave the rest for a
         * new node */
        size_t avail = tail->size - tail->used;
        size_t copy = avail >= len? len: avail;
        memcpy(tail->buf + tail->used, s, copy);
        tail->used += copy;
        s += copy;
        len -= copy;
    }
    if (len) {
        /* Create a new node, make sure it is allocated to at
         * least PROTO_REPLY_CHUNK_BYTES */
        size_t size = len < PROTO_REPLY_CHUNK_BYTES? PROTO_REPLY_CHUNK_BYTES: len;
        tail = zmalloc(size + sizeof(clientReplyBlock));
        /* take over the allocation's internal fragmentation */
        tail->size = zmalloc_usable_size(tail) - sizeof(clientReplyBlock);
        tail->used = len;
        memcpy(tail->buf, s, len);
        listAddNodeTail(c->reply, tail);
        c->reply_bytes += tail->size;

        closeClientOnOutputBufferLimitReached(c, 1);
    }
}

/* -----------------------------------------------------------------------------
 * Higher level functions to queue data on the client output buffer.