Function _addReplyToBuffer

app/redis-6.2.6/src/networking.c:293–308

Attempts to add the reply to the static buffer in the client struct. * Returns C_ERR if the buffer is full, or the reply list is not empty, * in which case the reply must be added to the reply list. */

 * Returns C_ERR if the buffer is full, or the reply list is not empty,
 * in which case the reply must be added to the reply list. */
int _addReplyToBuffer(client *c, const char *s, size_t len) {
    size_t available = sizeof(c->buf)-c->bufpos;

    if (c->flags & CLIENT_CLOSE_AFTER_REPLY) return C_OK;

    /* If there already are entries in the reply list, we cannot
     * add anything more to the static buffer. */
    if (listLength(c->reply) > 0) return C_ERR;

    /* Check that the buffer has enough space available for this string. */
    if (len > available) return C_ERR;

    memcpy(c->buf+c->bufpos,s,len);
    c->bufpos+=len;
    return C_OK;
}

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