<!-- ##### SECTION Title ##### -->
Unicode Manipulation

<!-- ##### SECTION Short_Description ##### -->
functions operating on Unicode characters and UTF-8 strings

<!-- ##### SECTION Long_Description ##### -->
<para>
This section describes a number of functions for dealing with
Unicode characters and strings.  There are analogues of the
traditional <filename>ctype.h</filename> character classification
and case conversion functions, UTF-8 analogues of some string utility 
functions, functions to perform normalization, case conversion and
collation on UTF-8 strings and finally functions to convert between
the UTF-8, UTF-16 and UCS-4 encodings of Unicode.
</para>

<para>
The implementations of the Unicode functions in GLib are based
on the Unicode Character Data tables, which are available from
<ulink url="http://www.unicode.org/">www.unicode.org</ulink>.
GLib 2.8 supports Unicode 4.0, GLib 2.10 supports Unicode 4.1,
GLib 2.12 supports Unicode 5.0, GLib 2.16.3 supports Unicode 5.1.
</para>

<!-- ##### SECTION See_Also ##### -->
<para>
<variablelist>

<varlistentry>
<term>g_locale_to_utf8(), g_locale_from_utf8()</term>
<listitem><para>
Convenience functions for converting between UTF-8 and the locale encoding. 
</para></listitem>
</varlistentry>

</variablelist>
</para>

<!-- ##### SECTION Stability_Level ##### -->


<!-- ##### SECTION Image ##### -->


<!-- ##### TYPEDEF gunichar ##### -->
<para>
A type which can hold any UTF-32 or UCS-4 character code, also known
as a Unicode code point.
</para>
<para>
If you want to produce the UTF-8 representation of a #gunichar,
use g_ucs4_to_utf8(). See also g_utf8_to_ucs4() for the reverse process.
</para>
<para>
To print/scan values of this type as integer, use
%G_GINT32_MODIFIER and/or %G_GUINT32_FORMAT.
</para>
<para>
The notation to express a Unicode code point in running text is as a
hexadecimal number with four to six digits and uppercase letters, prefixed
by the string "U+".  Leading zeros are omitted, unless the code point would
have fewer than four hexadecimal digits.
For example, "U+0041 LATIN CAPITAL LETTER A".
To print a code point in the U+-notation, use the format string
"U+%04"G_GINT32_FORMAT"X".
To scan, use the format string "U+%06"G_GINT32_FORMAT"X".
<informalexample>
<programlisting>
gunichar c;
sscanf ("U+0041", "U+%06"G_GINT32_FORMAT"X", &amp;c)
g_print ("Read U+%04"G_GINT32_FORMAT"X", c);
</programlisting>
</informalexample>
</para>


<!-- ##### TYPEDEF gunichar2 ##### -->
<para>
A type which can hold any UTF-16 code 
point<footnote id="utf16_surrogate_pairs">UTF-16 also has so called 
<firstterm>surrogate pairs</firstterm> to encode characters beyond the 
BMP as pairs of 16bit numbers. Surrogate pairs cannot be stored in a 
single gunichar2 field, but all GLib functions accepting gunichar2 arrays 
will correctly interpret surrogate pairs.</footnote>.
</para>
<para>
To print/scan values of this type to/from text you need to convert
to/from UTF-8, using g_utf16_to_utf8()/g_utf8_to_utf16().
</para>
<para>
To print/scan values of this type as integer, use
%G_GINT16_MODIFIER and/or %G_GUINT16_FORMAT.
</para>


<!-- ##### FUNCTION g_unichar_validate ##### -->
<para>

</para>

@ch: 
@Returns: 


<!-- ##### FUNCTION g_unichar_isalnum ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_isalpha ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_iscntrl ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_isdefined ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_isdigit ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_isgraph ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_islower ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_ismark ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_isprint ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_ispunct ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_isspace ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_istitle ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_isupper ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_isxdigit ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_iswide ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_iswide_cjk ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_iszerowidth ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_toupper ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_tolower ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_totitle ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_digit_value ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_xdigit_value ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### ENUM GUnicodeType ##### -->
<para>
These are the possible character classifications from the 
Unicode specification.
See <ulink url="http://www.unicode.org/Public/UNIDATA/UnicodeData.html"
>http://www.unicode.org/Public/UNIDATA/UnicodeData.html</ulink>.
</para>

@G_UNICODE_CONTROL: General category "Other, Control" (Cc)
@G_UNICODE_FORMAT: General category "Other, Format" (Cf)
@G_UNICODE_UNASSIGNED: General category "Other, Not Assigned" (Cn)
@G_UNICODE_PRIVATE_USE: General category "Other, Private Use" (Co)
@G_UNICODE_SURROGATE: General category "Other, Surrogate" (Cs)
@G_UNICODE_LOWERCASE_LETTER: General category "Letter, Lowercase" (Ll)
@G_UNICODE_MODIFIER_LETTER: General category "Letter, Modifier" (Lm)
@G_UNICODE_OTHER_LETTER: General category "Letter, Other" (Lo)
@G_UNICODE_TITLECASE_LETTER: General category "Letter, Titlecase" (Lt)
@G_UNICODE_UPPERCASE_LETTER: General category "Letter, Uppercase" (Lu)
@G_UNICODE_COMBINING_MARK: General category "Mark, Spacing Combining" (Mc)
@G_UNICODE_ENCLOSING_MARK: General category "Mark, Enclosing" (Me)
@G_UNICODE_NON_SPACING_MARK: General category "Mark, Nonspacing" (Mn)
@G_UNICODE_DECIMAL_NUMBER: General category "Number, Decimal Digit" (Nd)
@G_UNICODE_LETTER_NUMBER: General category "Number, Letter" (Nl)
@G_UNICODE_OTHER_NUMBER: General category "Number, Other" (No)
@G_UNICODE_CONNECT_PUNCTUATION: General category "Punctuation, Connector" (Pc)
@G_UNICODE_DASH_PUNCTUATION: General category "Punctuation, Dash" (Pd)
@G_UNICODE_CLOSE_PUNCTUATION: General category "Punctuation, Close" (Pe)
@G_UNICODE_FINAL_PUNCTUATION: General category "Punctuation, Final quote" (Pf)
@G_UNICODE_INITIAL_PUNCTUATION: General category "Punctuation, Initial quote" (Pi)
@G_UNICODE_OTHER_PUNCTUATION: General category "Punctuation, Other" (Po)
@G_UNICODE_OPEN_PUNCTUATION: General category "Punctuation, Open" (Ps)
@G_UNICODE_CURRENCY_SYMBOL: General category "Symbol, Currency" (Sc)
@G_UNICODE_MODIFIER_SYMBOL: General category "Symbol, Modifier" (Sk)
@G_UNICODE_MATH_SYMBOL: General category "Symbol, Math" (Sm)
@G_UNICODE_OTHER_SYMBOL: General category "Symbol, Other" (So)
@G_UNICODE_LINE_SEPARATOR: General category "Separator, Line" (Zl)
@G_UNICODE_PARAGRAPH_SEPARATOR: General category "Separator, Paragraph" (Zp)
@G_UNICODE_SPACE_SEPARATOR: General category "Separator, Space" (Zs)

<!-- ##### FUNCTION g_unichar_type ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### ENUM GUnicodeBreakType ##### -->
<para>
These are the possible line break classifications.
The five Hangul types were added in Unicode 4.1, so, has been
introduced in GLib 2.10.  Note that new types may be added in the future.
Applications should be ready to handle unknown values.
They may be regarded as %G_UNICODE_BREAK_UNKNOWN.
See <ulink url="http://www.unicode.org/unicode/reports/tr14/"
>http://www.unicode.org/unicode/reports/tr14/</ulink>.
</para>

@G_UNICODE_BREAK_MANDATORY: Mandatory Break (BK)
@G_UNICODE_BREAK_CARRIAGE_RETURN: Carriage Return (CR)
@G_UNICODE_BREAK_LINE_FEED: Line Feed (LF)
@G_UNICODE_BREAK_COMBINING_MARK: Attached Characters and Combining Marks (CM)
@G_UNICODE_BREAK_SURROGATE: Surrogates (SG)
@G_UNICODE_BREAK_ZERO_WIDTH_SPACE: Zero Width Space (ZW)
@G_UNICODE_BREAK_INSEPARABLE: Inseparable (IN)
@G_UNICODE_BREAK_NON_BREAKING_GLUE: Non-breaking ("Glue") (GL)
@G_UNICODE_BREAK_CONTINGENT: Contingent Break Opportunity (CB)
@G_UNICODE_BREAK_SPACE: Space (SP)
@G_UNICODE_BREAK_AFTER: Break Opportunity After (BA)
@G_UNICODE_BREAK_BEFORE: Break Opportunity Before (BB)
@G_UNICODE_BREAK_BEFORE_AND_AFTER: Break Opportunity Before and After (B2)
@G_UNICODE_BREAK_HYPHEN: Hyphen (HY)
@G_UNICODE_BREAK_NON_STARTER: Nonstarter (NS)
@G_UNICODE_BREAK_OPEN_PUNCTUATION: Opening Punctuation (OP)
@G_UNICODE_BREAK_CLOSE_PUNCTUATION: Closing Punctuation (CL)
@G_UNICODE_BREAK_QUOTATION: Ambiguous Quotation (QU)
@G_UNICODE_BREAK_EXCLAMATION: Exclamation/Interrogation (EX)
@G_UNICODE_BREAK_IDEOGRAPHIC: Ideographic (ID)
@G_UNICODE_BREAK_NUMERIC: Numeric (NU)
@G_UNICODE_BREAK_INFIX_SEPARATOR: Infix Separator (Numeric) (IS)
@G_UNICODE_BREAK_SYMBOL: Symbols Allowing Break After (SY)
@G_UNICODE_BREAK_ALPHABETIC: Ordinary Alphabetic and Symbol Characters (AL)
@G_UNICODE_BREAK_PREFIX: Prefix (Numeric) (PR)
@G_UNICODE_BREAK_POSTFIX: Postfix (Numeric) (PO)
@G_UNICODE_BREAK_COMPLEX_CONTEXT: Complex Content Dependent (South East Asian) (SA)
@G_UNICODE_BREAK_AMBIGUOUS: Ambiguous (Alphabetic or Ideographic) (AI)
@G_UNICODE_BREAK_UNKNOWN: Unknown (XX)
@G_UNICODE_BREAK_NEXT_LINE: Next Line (NL)
@G_UNICODE_BREAK_WORD_JOINER: Word Joiner (WJ)
@G_UNICODE_BREAK_HANGUL_L_JAMO: Hangul L Jamo (JL)
@G_UNICODE_BREAK_HANGUL_V_JAMO: Hangul V Jamo (JV)
@G_UNICODE_BREAK_HANGUL_T_JAMO: Hangul T Jamo (JT)
@G_UNICODE_BREAK_HANGUL_LV_SYLLABLE: Hangul LV Syllable (H2)
@G_UNICODE_BREAK_HANGUL_LVT_SYLLABLE: Hangul LVT Syllable (H3)

<!-- ##### FUNCTION g_unichar_break_type ##### -->
<para>

</para>

@c: 
@Returns: 


<!-- ##### FUNCTION g_unichar_combining_class ##### -->
<para>

</para>

@uc: 
@Returns: 


<!-- ##### FUNCTION g_unicode_canonical_ordering ##### -->
<para>

</para>

@string: 
@len: 


<!-- ##### FUNCTION g_unicode_canonical_decomposition ##### -->
<para>

</para>

@ch: 
@result_len: 
@Returns: 


<!-- ##### FUNCTION g_unichar_get_mirror_char ##### -->
<para>

</para>

@ch: 
@mirrored_ch: 
@Returns: 


<!-- ##### ENUM GUnicodeScript ##### -->
<para>
The #GUnicodeScript enumeration identifies different writing
systems. The values correspond to the names as defined in the
Unicode standard. The enumeration has been added in GLib 2.14,
and is interchangeable with #PangoScript.
Note that new types may be added in the future. Applications 
should be ready to handle unknown values.
See <ulink
url="http://www.unicode.org/reports/tr24/">Unicode Standard Annex
#24: Script names</ulink>.
</para>

@G_UNICODE_SCRIPT_INVALID_CODE: a value never returned from g_unichar_get_script()
@G_UNICODE_SCRIPT_COMMON:     a character used by multiple different scripts
@G_UNICODE_SCRIPT_INHERITED:  a mark glyph that takes its script from the
                              base glyph to which it is attached
@G_UNICODE_SCRIPT_ARABIC:     Arabic
@G_UNICODE_SCRIPT_ARMENIAN:   Armenian
@G_UNICODE_SCRIPT_BENGALI:    Bengali
@G_UNICODE_SCRIPT_BOPOMOFO:   Bopomofo
@G_UNICODE_SCRIPT_CHEROKEE:   Cherokee
@G_UNICODE_SCRIPT_COPTIC:     Coptic
@G_UNICODE_SCRIPT_CYRILLIC:   Cyrillic
@G_UNICODE_SCRIPT_DESERET:    Deseret
@G_UNICODE_SCRIPT_DEVANAGARI: Devanagari
@G_UNICODE_SCRIPT_ETHIOPIC:   Ethiopic
@G_UNICODE_SCRIPT_GEORGIAN:   Georgian
@G_UNICODE_SCRIPT_GOTHIC:     Gothic
@G_UNICODE_SCRIPT_GREEK:      Greek
@G_UNICODE_SCRIPT_GUJARATI:   Gujarati
@G_UNICODE_SCRIPT_GURMUKHI:   Gurmukhi
@G_UNICODE_SCRIPT_HAN:        Han
@G_UNICODE_SCRIPT_HANGUL:     Hangul
@G_UNICODE_SCRIPT_HEBREW:     Hebrew
@G_UNICODE_SCRIPT_HIRAGANA:   Hiragana
@G_UNICODE_SCRIPT_KANNADA:    Kannada
@G_UNICODE_SCRIPT_KATAKANA:   Katakana
@G_UNICODE_SCRIPT_KHMER:      Khmer
@G_UNICODE_SCRIPT_LAO:        Lao
@G_UNICODE_SCRIPT_LATIN:      Latin
@G_UNICODE_SCRIPT_MALAYALAM:  Malayalam
@G_UNICODE_SCRIPT_MONGOLIAN:  Mongolian
@G_UNICODE_SCRIPT_MYANMAR:    Myanmar
@G_UNICODE_SCRIPT_OGHAM:      Ogham
@G_UNICODE_SCRIPT_OLD_ITALIC: Old Italic
@G_UNICODE_SCRIPT_ORIYA:      Oriya
@G_UNICODE_SCRIPT_RUNIC:      Runic
@G_UNICODE_SCRIPT_SINHALA:    Sinhala
@G_UNICODE_SCRIPT_SYRIAC:     Syriac
@G_UNICODE_SCRIPT_TAMIL:      Tamil
@G_UNICODE_SCRIPT_TELUGU:     Telugu
@G_UNICODE_SCRIPT_THAANA:     Thaana
@G_UNICODE_SCRIPT_THAI:       Thai
@G_UNICODE_SCRIPT_TIBETAN:    Tibetan
@G_UNICODE_SCRIPT_CANADIAN_ABORIGINAL: 
                              Canadian Aboriginal
@G_UNICODE_SCRIPT_YI:         Yi
@G_UNICODE_SCRIPT_TAGALOG:    Tagalog
@G_UNICODE_SCRIPT_HANUNOO:    Hanunoo
@G_UNICODE_SCRIPT_BUHID:      Buhid
@G_UNICODE_SCRIPT_TAGBANWA:   Tagbanwa
@G_UNICODE_SCRIPT_BRAILLE:    Braille
@G_UNICODE_SCRIPT_CYPRIOT:    Cypriot
@G_UNICODE_SCRIPT_LIMBU:      Limbu
@G_UNICODE_SCRIPT_OSMANYA:    Osmanya
@G_UNICODE_SCRIPT_SHAVIAN:    Shavian
@G_UNICODE_SCRIPT_LINEAR_B:   Linear B
@G_UNICODE_SCRIPT_TAI_LE:     Tai Le
@G_UNICODE_SCRIPT_UGARITIC:   Ugaritic
@G_UNICODE_SCRIPT_NEW_TAI_LUE: New Tai Lue
@G_UNICODE_SCRIPT_BUGINESE:   Buginese
@G_UNICODE_SCRIPT_GLAGOLITIC: Glagolitic
@G_UNICODE_SCRIPT_TIFINAGH:   Tifinagh
@G_UNICODE_SCRIPT_SYLOTI_NAGRI: Syloti Nagri
@G_UNICODE_SCRIPT_OLD_PERSIAN: Old Persian
@G_UNICODE_SCRIPT_KHAROSHTHI: Kharoshthi
@G_UNICODE_SCRIPT_UNKNOWN:    an unassigned code point
@G_UNICODE_SCRIPT_BALINESE:   Balinese
@G_UNICODE_SCRIPT_CUNEIFORM:  Cuneiform
@G_UNICODE_SCRIPT_PHOENICIAN: Phoenician
@G_UNICODE_SCRIPT_PHAGS_PA:   Phags-pa
@G_UNICODE_SCRIPT_NKO:        N'Ko
@G_UNICODE_SCRIPT_KAYAH_LI:   Kayah Li. Since 2.16.3
@G_UNICODE_SCRIPT_LEPCHA:     Lepcha. Since 2.16.3
@G_UNICODE_SCRIPT_REJANG:     Rejang. Since 2.16.3
@G_UNICODE_SCRIPT_SUNDANESE:  Sundanese. Since 2.16.3
@G_UNICODE_SCRIPT_SAURASHTRA: Saurashtra. Since 2.16.3
@G_UNICODE_SCRIPT_CHAM:       Cham. Since 2.16.3
@G_UNICODE_SCRIPT_OL_CHIKI:   Ol Chiki. Since 2.16.3
@G_UNICODE_SCRIPT_VAI:        Vai. Since 2.16.3
@G_UNICODE_SCRIPT_CARIAN:     Carian. Since 2.16.3
@G_UNICODE_SCRIPT_LYCIAN:     Lycian. Since 2.16.3
@G_UNICODE_SCRIPT_LYDIAN:     Lydian. Since 2.16.3

<!-- ##### FUNCTION g_unichar_get_script ##### -->
<para>

</para>

@ch: 
@Returns: 


<!-- ##### MACRO g_utf8_next_char ##### -->
<para>
Skips to the next character in a UTF-8 string. The string must be
valid; this macro is as fast as possible, and has no error-checking.
You would use this macro to iterate over a string character by
character. The macro returns the start of the next UTF-8 character.
Before using this macro, use g_utf8_validate() to validate strings
that may contain invalid UTF-8.
</para>

@p: Pointer to the start of a valid UTF-8 character.


<!-- ##### FUNCTION g_utf8_get_char ##### -->
<para>

</para>

@p: 
@Returns: 


<!-- ##### FUNCTION g_utf8_get_char_validated ##### -->
<para>

</para>

@p: 
@max_len: 
@Returns: 


<!-- ##### FUNCTION g_utf8_offset_to_pointer ##### -->
<para>

</para>

@str: 
@offset: 
@Returns: 


<!-- ##### FUNCTION g_utf8_pointer_to_offset ##### -->
<para>

</para>

@str: 
@pos: 
@Returns: 


<!-- ##### FUNCTION g_utf8_prev_char ##### -->
<para>

</para>

@p: 
@Returns: 


<!-- ##### FUNCTION g_utf8_find_next_char ##### -->
<para>

</para>

@p: 
@end: 
@Returns: 


<!-- ##### FUNCTION g_utf8_find_prev_char ##### -->
<para>

</para>

@str: 
@p: 
@Returns: 


<!-- ##### FUNCTION g_utf8_strlen ##### -->
<para>

</para>

@p: 
@max: 
@Returns: 


<!-- ##### FUNCTION g_utf8_strncpy ##### -->
<para>

</para>

@dest: 
@src: 
@n: 
@Returns: 


<!-- ##### FUNCTION g_utf8_strchr ##### -->
<para>

</para>

@p: 
@len: 
@c: 
@Returns: 


<!-- ##### FUNCTION g_utf8_strrchr ##### -->
<para>

</para>

@p: 
@len: 
@c: 
@Returns: 


<!-- ##### FUNCTION g_utf8_strreverse ##### -->
<para>

</para>

@str: 
@len: 
@Returns: 


<!-- ##### FUNCTION g_utf8_validate ##### -->
<para>

</para>

@str: 
@max_len: 
@end: 
@Returns: 


<!-- ##### FUNCTION g_utf8_strup ##### -->
<para>

</para>

@str: 
@len: 
@Returns: 


<!-- ##### FUNCTION g_utf8_strdown ##### -->
<para>

</para>

@str: 
@len: 
@Returns: 


<!-- ##### FUNCTION g_utf8_casefold ##### -->
<para>

</para>

@str: 
@len: 
@Returns: 


<!-- ##### FUNCTION g_utf8_normalize ##### -->
<para>

</para>

@str: 
@len: 
@mode: 
@Returns: 


<!-- ##### ENUM GNormalizeMode ##### -->
<para>
Defines how a Unicode string is transformed in a canonical 
form, standardizing such issues as whether a character with an accent is 
represented as a base character and combining accent or as a single precomposed
character. Unicode strings should generally be normalized before comparing them.
</para>

@G_NORMALIZE_DEFAULT: standardize differences that do not affect the
  text content, such as the above-mentioned accent representation.
@G_NORMALIZE_NFD: another name for %G_NORMALIZE_DEFAULT.
@G_NORMALIZE_DEFAULT_COMPOSE: like %G_NORMALIZE_DEFAULT, but with composed
  forms rather than a maximally decomposed form.
@G_NORMALIZE_NFC: another name for %G_NORMALIZE_DEFAULT_COMPOSE.
@G_NORMALIZE_ALL: beyond %G_NORMALIZE_DEFAULT also standardize the 
  "compatibility" characters in Unicode, such as SUPERSCRIPT THREE to the 
  standard forms (in this case DIGIT THREE). Formatting information may be 
  lost but for most text operations such characters should be considered the 
  same.
@G_NORMALIZE_NFKD: another name for %G_NORMALIZE_ALL.
@G_NORMALIZE_ALL_COMPOSE: like %G_NORMALIZE_ALL, but with composed
  forms rather than a maximally decomposed form.
@G_NORMALIZE_NFKC: another name for %G_NORMALIZE_ALL_COMPOSE.

<!-- ##### FUNCTION g_utf8_collate ##### -->
<para>

</para>

@str1: 
@str2: 
@Returns: 


<!-- ##### FUNCTION g_utf8_collate_key ##### -->
<para>

</para>

@str: 
@len: 
@Returns: 


<!-- ##### FUNCTION g_utf8_collate_key_for_filename ##### -->
<para>

</para>

@str: 
@len: 
@Returns: 


<!-- ##### FUNCTION g_utf8_to_utf16 ##### -->
<para>

</para>

@str: 
@len: 
@items_read: 
@items_written: 
@error: 
@Returns: 


<!-- ##### FUNCTION g_utf8_to_ucs4 ##### -->
<para>

</para>

@str: 
@len: 
@items_read: 
@items_written: 
@error: 
@Returns: 


<!-- ##### FUNCTION g_utf8_to_ucs4_fast ##### -->
<para>

</para>

@str: 
@len: 
@items_written: 
@Returns: 


<!-- ##### FUNCTION g_utf16_to_ucs4 ##### -->
<para>

</para>

@str: 
@len: 
@items_read: 
@items_written: 
@error: 
@Returns: 


<!-- ##### FUNCTION g_utf16_to_utf8 ##### -->
<para>

</para>

@str: 
@len: 
@items_read: 
@items_written: 
@error: 
@Returns: 


<!-- ##### FUNCTION g_ucs4_to_utf16 ##### -->
<para>

</para>

@str: 
@len: 
@items_read: 
@items_written: 
@error: 
@Returns: 


<!-- ##### FUNCTION g_ucs4_to_utf8 ##### -->
<para>

</para>

@str: 
@len: 
@items_read: 
@items_written: 
@error: 
@Returns: 


<!-- ##### FUNCTION g_unichar_to_utf8 ##### -->
<para>

</para>

@c: 
@outbuf: 
@Returns: