/* Canonicalize path, and return a new path. Do everything in situ. The new
path differs from path in:
Multiple `/'s are collapsed to a single `/'.
Leading `./'s and trailing `/.'s are removed.
Non-leading `../'s and trailing `..'s are handled by removing
portions of the path. */
static gchar *
mate_vfs_canonicalize_pathname (gchar *path)
{
int i, marker;
if (path == NULL || strlen (path) == 0) {
return "";
}
/* Walk along path looking for things to compact. */
for (i = 0, marker = 0;;) {
if (!path[i])
break;
/* Check for `../', `./' or trailing `.' by itself. */
if (path[i] == '.') {
/* Handle trailing `.' by itself. */
if (path[i + 1] == '\0') {
if (i > 1 && path[i - 1] == MATE_VFS_URI_PATH_CHR) {
/* strip the trailing /. */
path[i - 1] = '\0';
} else {
/* convert path "/." to "/" */
path[i] = '\0';
}
break;
}
/* Handle `./'. */
if (path[i + 1] == MATE_VFS_URI_PATH_CHR) {
memmove (path + i, path + i + 2,
strlen (path + i + 2) + 1);
if (i == 0) {
/* don't leave leading '/' for paths that started
* as relative (.//foo)
*/
collapse_slash_runs (path, i);
marker = 0;
}
continue;
}
/* Handle `../' or trailing `..' by itself.
* Remove the previous xxx/ part
*/
if (path[i + 1] == '.'
&& (path[i + 2] == MATE_VFS_URI_PATH_CHR
|| path[i + 2] == '\0')) {
/* ignore ../ at the beginning of a path */
if (i != 0) {
marker = find_slash_before_offset (path, i - 1);
/* Either advance past '/' or point to the first character */
marker ++;
if (path [i + 2] == '\0' && marker > 1) {
/* If we are looking at a /.. at the end of the uri and we
* need to eat the last '/' too.
*/
marker--;
}
g_assert(marker < i);
if (path[i + 2] == MATE_VFS_URI_PATH_CHR) {
/* strip the entire ../ string */
i++;
}
memmove (path + marker, path + i + 2,
strlen (path + i + 2) + 1);
i = marker;
} else {
i = 2;
if (path[i] == MATE_VFS_URI_PATH_CHR) {
i++;
}
}
collapse_slash_runs (path, i);
continue;
}
}
/* advance to the next '/' */
i = find_next_slash (path, i);
/* If we didn't find any slashes, then there is nothing left to do. */
if (i < 0) {
break;
}
marker = i++;
collapse_slash_runs (path, i);
}
return path;
}
/**
* thunar_vfs_canonicalize_filename:
* @filename : a local filename.
*
* Canonicalizes @filename and returns a new path. The new path
* differs from @filename in:
*
* <simplelist>
* <member>Multiple `/'s are collapsed to a single `/'.</member>
* <member>Leading `./'s and trailing `/.'s are removed.</member>
* <member>Non-leading `../'s and trailing `..'s are handled by removing portions of the path.</member>
* </simplelist>
*
* The caller is responsible to free the returned string using
* g_free() when no longer needed.
*
* Return value: the canonicalized path for @filename.
**/
gchar*
thunar_vfs_canonicalize_filename (const gchar *filename)
{
gchar *path;
gint marker;
gint i;
g_return_val_if_fail (filename != NULL, NULL);
/* take a copy of the filename to operate on */
path = g_strdup (filename);
if (G_UNLIKELY (*path == '\0'))
return path;
/* Walk along path looking for things to compact. */
for (i = 0, marker = 0;;)
{
if (G_UNLIKELY (path[i] == '\0'))
break;
/* Check for `../', `./' or trailing `.' by itself. */
if (path[i] == '.')
{
/* Handle trailing `.' by itself. */
if (path[i + 1] == '\0')
{
if (i > 1 && path[i - 1] == G_DIR_SEPARATOR)
{
/* strip the trailing /. */
path[i - 1] = '\0';
}
else
{
/* convert path "/." to "/" */
path[i] = '\0';
}
break;
}
/* Handle `./'. */
if (path[i + 1] == G_DIR_SEPARATOR)
{
memmove (path + i, path + i + 2, strlen (path + i + 2) + 1);
if (i == 0)
{
/* don't leave leading '/' for paths that started
* as relative (.//foo)
*/
collapse_slash_runs (path, i);
marker = 0;
}
continue;
}
/* Handle `../' or trailing `..' by itself.
* Remove the previous xxx/ part
*/
if (path[i + 1] == '.' && (path[i + 2] == G_DIR_SEPARATOR || path[i + 2] == '\0'))
{
/* ignore ../ at the beginning of a path */
if (i != 0)
{
marker = find_slash_before_offset (path, i - 1);
/* Either advance past '/' or point to the first character */
marker ++;
if (path [i + 2] == '\0' && marker > 1)
{
/* If we are looking at a /.. at the end of the uri and we
* need to eat the last '/' too.
*/
marker--;
}
/* strip the entire ../ string */
if (path[i + 2] == G_DIR_SEPARATOR)
++i;
memmove (path + marker, path + i + 2, strlen (path + i + 2) + 1);
i = marker;
}
else
{
i = 2;
if (path[i] == G_DIR_SEPARATOR)
i++;
}
collapse_slash_runs (path, i);
continue;
}
}
/* advance to the next '/' */
i = find_next_slash (path, i);
/* If we didn't find any slashes, then there is nothing left to do. */
if (i < 0)
break;
marker = i++;
collapse_slash_runs (path, i);
}
return path;
}
