## URI Functions URI Functions — URI Functions |

## Synopsis

    #include <glib.h>

    #define             G_URI_RESERVED_CHARS_ALLOWED_IN_PATH
    #define             G_URI_RESERVED_CHARS_ALLOWED_IN_PATH_ELEMENT
    #define             G_URI_RESERVED_CHARS_ALLOWED_IN_USERINFO
    #define             G_URI_RESERVED_CHARS_GENERIC_DELIMITERS
    #define             G_URI_RESERVED_CHARS_SUBCOMPONENT_DELIMITERS
    char *              g_uri_parse_scheme                  (const char *uri);
    char *              g_uri_escape_string                 (const char *unescaped,
                                                             const char *reserved_chars_allowed,
                                                             gboolean allow_utf8);
    char *              g_uri_unescape_string               (const char *escaped_string,
                                                             const char *illegal_characters);
    char *              g_uri_unescape_segment              (const char *escaped_string,
                                                             const char *escaped_string_end,
                                                             const char *illegal_characters);
    gchar **            g_uri_list_extract_uris             (const gchar *uri_list);
    gchar *             g_filename_from_uri                 (const gchar *uri,
                                                             gchar **hostname,
                                                             GError **error);
    gchar *             g_filename_to_uri                   (const gchar *filename,
                                                             const gchar *hostname,
                                                             GError **error);

## Description

Functions for manipulating Universal Resource Identifiers (URIs) as defined by RFC 3986. It is highly recommended that you have read and understand RFC 3986 for understanding this API.

## Details

### G_URI_RESERVED_CHARS_ALLOWED_IN_PATH

    #define G_URI_RESERVED_CHARS_ALLOWED_IN_PATH G_URI_RESERVED_CHARS_ALLOWED_IN_PATH_ELEMENT "/"

Allowed characters in a path. Includes "!$&'()*+,;=:@/".

### G_URI_RESERVED_CHARS_ALLOWED_IN_PATH_ELEMENT

    #define G_URI_RESERVED_CHARS_ALLOWED_IN_PATH_ELEMENT G_URI_RESERVED_CHARS_SUBCOMPONENT_DELIMITERS ":@"

Allowed characters in path elements. Includes "!$&'()*+,;=:@".

### G_URI_RESERVED_CHARS_ALLOWED_IN_USERINFO

    #define G_URI_RESERVED_CHARS_ALLOWED_IN_USERINFO G_URI_RESERVED_CHARS_SUBCOMPONENT_DELIMITERS ":"

Allowed characters in userinfo as defined in RFC 3986. Includes "!$&'()*+,;=:".

### G_URI_RESERVED_CHARS_GENERIC_DELIMITERS

    #define G_URI_RESERVED_CHARS_GENERIC_DELIMITERS ":/?#[]@"

Generic delimiters characters as defined in RFC 3986. Includes ":/?#[]@".

### G_URI_RESERVED_CHARS_SUBCOMPONENT_DELIMITERS

    #define G_URI_RESERVED_CHARS_SUBCOMPONENT_DELIMITERS "!$&'()*+,;="

Subcomponent delimiter characters as defined in RFC 3986. Includes "!$&'()*+,;=".

### g_uri_parse_scheme ()

    char *              g_uri_parse_scheme                  (const char *uri);

Gets the scheme portion of a URI string. RFC 3986 decodes the scheme as:

    URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ]

Common schemes include "file", "http", "svn+ssh", etc.

`uri` : | a valid URI.
Returns : | The "Scheme" component of the URI, or `NULL` on error. The returned string should be freed when no longer needed.

Since 2.16

### g_uri_escape_string ()

    char *              g_uri_escape_string                 (const char *unescaped,
                                                             const char *reserved_chars_allowed,
                                                             gboolean allow_utf8);

Escapes a string for use in a URI.

Normally all characters that are not "unreserved" (i.e. ASCII alphanumerical characters plus dash, dot, underscore and tilde) are escaped. But if you specify characters in `reserved_chars_allowed` they are not escaped. This is useful for the "reserved" characters in the URI specification, since those are allowed unescaped in some portions of a URI.

`unescaped` : | the unescaped input string.
`reserved_chars_allowed` : | a string of reserved characters that are allowed to be used, or `NULL`.
`allow_utf8` : | `TRUE` if the result can include UTF-8 characters.
Returns : | an escaped version of `unescaped`. The returned string should be freed when no longer needed.

Since 2.16

### g_uri_unescape_string ()

    char *              g_uri_unescape_string               (const char *escaped_string,
                                                             const char *illegal_characters);

Unescapes a whole escaped string.

If any of the characters in `illegal_characters` or the character zero appears as an escaped character in `escaped_string` then that is an error and `NULL` will be returned. This is useful it you want to avoid for instance having a slash being expanded in an escaped path element, which might confuse pathname handling.

`escaped_string` : | an escaped string to be unescaped.
`illegal_characters` : | an optional string of illegal characters not to be allowed.
Returns : | an unescaped version of `escaped_string`. The returned string should be freed when no longer needed.

Since 2.16

### g_uri_unescape_segment ()

    char *              g_uri_unescape_segment              (const char *escaped_string,
                                                             const char *escaped_string_end,
                                                             const char *illegal_characters);

Unescapes a segment of an escaped string.

If any of the characters in `illegal_characters` or the character zero appears as an escaped character in `escaped_string` then that is an error and `NULL` will be returned. This is useful it you want to avoid for instance having a slash being expanded in an escaped path element, which might confuse pathname handling.

`escaped_string` : | a string.
`escaped_string_end` : | a string.
`illegal_characters` : | an optional string of illegal characters not to be allowed.
Returns : | an unescaped version of `escaped_string` or `NULL` on error. The returned string should be freed when no longer needed.

Since 2.16

### g_uri_list_extract_uris ()

    gchar **            g_uri_list_extract_uris             (const gchar *uri_list);

Splits an URI list conforming to the text/uri-list mime type defined in RFC 2483 into individual URIs, discarding any comments. The URIs are not validated.

`uri_list` : | an URI list
Returns : | a newly allocated `NULL`-terminated list of strings holding the individual URIs. The array should be freed with `g_strfreev()`.

Since 2.6

### g_filename_from_uri ()

    gchar *             g_filename_from_uri                 (const gchar *uri,
                                                             gchar **hostname,
                                                             GError **error);

Converts an escaped ASCII-encoded URI to a local filename in the encoding used for filenames.

`uri` : | a uri describing a filename (escaped, encoded in ASCII).
`hostname` : | Location to store hostname for the URI, or `NULL`. If there is no hostname in the URI, `NULL` will be stored in this location.
`error` : | location to store the error occuring, or `NULL` to ignore errors. Any of the errors in GConvertError may occur.
Returns : | a newly-allocated string holding the resulting filename, or `NULL` on an error.

### g_filename_to_uri ()

    gchar *             g_filename_to_uri                   (const gchar *filename,
                                                             const gchar *hostname,
                                                             GError **error);

Converts an absolute filename to an escaped ASCII-encoded URI, with the path component following Section 3.3. of RFC 2396.

`filename` : | an absolute filename specified in the GLib file name encoding, which is the on-disk file name bytes on Unix, and UTF-8 on Windows
`hostname` : | A UTF-8 encoded hostname, or `NULL` for none.
`error` : | location to store the error occuring, or `NULL` to ignore errors. Any of the errors in GConvertError may occur.
Returns : | a newly-allocated string holding the resulting URI, or `NULL` on an error.