Function rw_verify_area

components/dfs/dfs_v2/src/dfs_file.c:238–253

* @brief Verify read/write area parameters and limit count size * * This function checks the validity of read/write parameters and limits the count * to a maximum value (MAX_RW_COUNT) to prevent overflow. It ensures the position * and count values are within valid ranges. * * @param[in] file Pointer to the file structure (unused in current implementation) * @param[in] ppos Pointer to the po

 *       so that others won't have to do range checks all the time.
 */
ssize_t rw_verify_area(struct dfs_file *file, off_t *ppos, size_t count)
{
    off_t pos;
    ssize_t retval = -EINVAL;

    if ((size_t)count < 0)
        return retval;
    pos = *ppos;
    if (pos < 0)
    {
        if (count >= -pos) /* both values are in 0..LLONG_MAX */
            return -EOVERFLOW;
    }

    return count > MAX_RW_COUNT ? MAX_RW_COUNT : count;
}

/**
 * @brief Get the current file position