Function dfs_normalize_path

components/dfs/dfs_v2/src/dfs.c:947–1097

* @brief Normalize a path by combining directory and filename into an absolute path * * @param[in] directory The parent directory path (NULL means use working directory) * @param[in] filename The filename or relative path to be normalized * * @return char* The normalized absolute path (must be freed by caller), * NULL if path is invalid or memory allocation fails * * @note This fun

 *       - Allocate memory for the returned path string
 */
char *dfs_normalize_path(const char *directory, const char *filename)
{
    char *fullpath;
    char *dst0, *dst, *src;

    /* check parameters */
    RT_ASSERT(filename != NULL);

#ifdef DFS_USING_WORKDIR
    if (directory == NULL) /* shall use working directory */
    {
#ifdef RT_USING_SMART
        directory = lwp_getcwd();
#else
        directory = &working_directory[0];
#endif
    }
#else
    if ((directory == NULL) && (filename[0] != '/'))
    {
        rt_kprintf(NO_WORKING_DIR);

        return NULL;
    }
#endif

    if (filename[0] != '/')
    {
        int path_len;

        path_len = strlen(directory) + strlen(filename) + 2;
        if (path_len > DFS_PATH_MAX)
        {
            return NULL;
        }

        fullpath = (char *)rt_malloc(path_len);
        if (fullpath == NULL)
        {
            return NULL;
        }

        /* join path and file name */
        rt_snprintf(fullpath, strlen(directory) + strlen(filename) + 2,
                    "%s/%s", directory, filename);
    }
    else /* it's a absolute path, use it directly */
    {
        fullpath = rt_strdup(filename); /* copy string */

        if (fullpath == NULL)
            return NULL;
    }

    /* Initialize source and destination pointers to start of path */
    src = fullpath;
    dst = fullpath;