Function _fdt_slot_alloc

components/dfs/dfs_v2/src/dfs.c:105–130

* @brief Allocate an available file descriptor slot in the file descriptor table * * @param[in,out] fdt Pointer to the file descriptor table to allocate from * @param[in] startfd The starting file descriptor index to begin searching * * @return int The allocated file descriptor index if successful (>= 0), * -1 if allocation failed (table expansion failed) * * @note If no empty slot

 * @note If no empty slot found, expand the table and return the new index.
 */
static int _fdt_slot_alloc(struct dfs_fdtable *fdt, int startfd)
{
    int idx;

    /* find an empty fd slot */
    for (idx = startfd; idx < (int)fdt->maxfd; idx++)
    {
        if (fdt->fds[idx] == RT_NULL)
        {
            return idx;
        }
    }

    idx = fdt->maxfd;
    if (idx < startfd)
    {
        idx = startfd;
    }

    if (_fdt_slot_expand(fdt, idx) < 0)
    {
        return -1;
    }

    return idx;
}

/**
 * @brief Allocate a file descriptor from the file descriptor table