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src/core/ngx_buf.c  view on Meta::CPAN

ngx_int_t
ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain, ngx_chain_t *in)
{
    ngx_chain_t  *cl, **ll;

    ll = chain;

    for (cl = *chain; cl; cl = cl->next) {
        ll = &cl->next;
    }

    while (in) {
        cl = ngx_alloc_chain_link(pool);
        if (cl == NULL) {
            return NGX_ERROR;
        }

        cl->buf = in->buf;
        *ll = cl;
        ll = &cl->next;
        in = in->next;
    }

    *ll = NULL;

    return NGX_OK;
}


ngx_chain_t *
ngx_chain_get_free_buf(ngx_pool_t *p, ngx_chain_t **free)
{
    ngx_chain_t  *cl;

    if (*free) {
        cl = *free;
        *free = cl->next;
        cl->next = NULL;
        return cl;
    }

    cl = ngx_alloc_chain_link(p);
    if (cl == NULL) {
        return NULL;
    }

    cl->buf = ngx_calloc_buf(p);
    if (cl->buf == NULL) {
        return NULL;
    }

    cl->next = NULL;

    return cl;
}


void
ngx_chain_update_chains(ngx_pool_t *p, ngx_chain_t **free, ngx_chain_t **busy,
    ngx_chain_t **out, ngx_buf_tag_t tag)
{
    ngx_chain_t  *cl;

    if (*busy == NULL) {
        *busy = *out;

    } else {
        for (cl = *busy; cl->next; cl = cl->next) { /* void */ }

        cl->next = *out;
    }

    *out = NULL;

    while (*busy) {
        cl = *busy;

        if (ngx_buf_size(cl->buf) != 0) {
            break;
        }

        if (cl->buf->tag != tag) {
            *busy = cl->next;
            ngx_free_chain(p, cl);
            continue;
        }

        cl->buf->pos = cl->buf->start;
        cl->buf->last = cl->buf->start;

        *busy = cl->next;
        cl->next = *free;
        *free = cl;
    }
}


off_t
ngx_chain_coalesce_file(ngx_chain_t **in, off_t limit)
{
    off_t         total, size, aligned, fprev;
    ngx_fd_t      fd;
    ngx_chain_t  *cl;

    total = 0;

    cl = *in;
    fd = cl->buf->file->fd;

    do {
        size = cl->buf->file_last - cl->buf->file_pos;

        if (size > limit - total) {
            size = limit - total;

            aligned = (cl->buf->file_pos + size + ngx_pagesize - 1)
                       & ~((off_t) ngx_pagesize - 1);

            if (aligned <= cl->buf->file_last) {
                size = aligned - cl->buf->file_pos;
            }
        }

        total += size;
        fprev = cl->buf->file_pos + size;
        cl = cl->next;

    } while (cl
             && cl->buf->in_file
             && total < limit
             && fd == cl->buf->file->fd
             && fprev == cl->buf->file_pos);

    *in = cl;

    return total;
}


ngx_chain_t *
ngx_chain_update_sent(ngx_chain_t *in, off_t sent)
{
    off_t  size;

    for ( /* void */ ; in; in = in->next) {

        if (ngx_buf_special(in->buf)) {
            continue;
        }

        if (sent == 0) {