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+<title>GNU libunistring: 12. Normalization forms (composition and decomposition) &lt;uninorm.h&gt;</title>
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+<tr><td valign="middle" align="left">[<a href="libunistring_11.html#SEC41" title="Beginning of this chapter or previous chapter"> &lt;&lt; </a>]</td>
+<td valign="middle" align="left">[<a href="libunistring_13.html#SEC48" title="Next chapter"> &gt;&gt; </a>]</td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left">[<a href="libunistring.html#SEC_Top" title="Cover (top) of document">Top</a>]</td>
+<td valign="middle" align="left">[<a href="libunistring.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
+<td valign="middle" align="left">[<a href="libunistring_18.html#SEC71" title="Index">Index</a>]</td>
+<td valign="middle" align="left">[<a href="libunistring_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
+</tr></table>
+
+<hr size="2">
+<a name="uninorm_002eh"></a>
+<a name="SEC42"></a>
+<h1 class="chapter"> <a href="libunistring.html#TOC42">12. Normalization forms (composition and decomposition) <code>&lt;uninorm.h&gt;</code></a> </h1>
+
+<p>This include file defines functions for transforming Unicode strings to one
+of the four normal forms, known as NFC, NFD, NKFC, NFKD. These
+transformations involve decomposition and &mdash; for NFC and NFKC &mdash; composition
+of Unicode characters.
+</p>
+
+<hr size="6">
+<a name="Decomposition-of-characters"></a>
+<a name="SEC43"></a>
+<h2 class="section"> <a href="libunistring.html#TOC43">12.1 Decomposition of Unicode characters</a> </h2>
+
+<p>The following enumerated values are the possible types of decomposition of a
+Unicode character.
+</p>
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_CANONICAL</b>
+<a name="IDX646"></a>
+</dt>
+<dd><p>Denotes canonical decomposition.
+</p></dd></dl>
+
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_FONT</b>
+<a name="IDX647"></a>
+</dt>
+<dd><p>UCD marker: <code>&lt;font&gt;</code>. Denotes a font variant (e.g. a blackletter form).
+</p></dd></dl>
+
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_NOBREAK</b>
+<a name="IDX648"></a>
+</dt>
+<dd><p>UCD marker: <code>&lt;noBreak&gt;</code>.
+Denotes a no-break version of a space or hyphen.
+</p></dd></dl>
+
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_INITIAL</b>
+<a name="IDX649"></a>
+</dt>
+<dd><p>UCD marker: <code>&lt;initial&gt;</code>.
+Denotes an initial presentation form (Arabic).
+</p></dd></dl>
+
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_MEDIAL</b>
+<a name="IDX650"></a>
+</dt>
+<dd><p>UCD marker: <code>&lt;medial&gt;</code>.
+Denotes a medial presentation form (Arabic).
+</p></dd></dl>
+
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_FINAL</b>
+<a name="IDX651"></a>
+</dt>
+<dd><p>UCD marker: <code>&lt;final&gt;</code>.
+Denotes a final presentation form (Arabic).
+</p></dd></dl>
+
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_ISOLATED</b>
+<a name="IDX652"></a>
+</dt>
+<dd><p>UCD marker: <code>&lt;isolated&gt;</code>.
+Denotes an isolated presentation form (Arabic).
+</p></dd></dl>
+
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_CIRCLE</b>
+<a name="IDX653"></a>
+</dt>
+<dd><p>UCD marker: <code>&lt;circle&gt;</code>.
+Denotes an encircled form.
+</p></dd></dl>
+
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_SUPER</b>
+<a name="IDX654"></a>
+</dt>
+<dd><p>UCD marker: <code>&lt;super&gt;</code>.
+Denotes a superscript form.
+</p></dd></dl>
+
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_SUB</b>
+<a name="IDX655"></a>
+</dt>
+<dd><p>UCD marker: <code>&lt;sub&gt;</code>.
+Denotes a subscript form.
+</p></dd></dl>
+
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_VERTICAL</b>
+<a name="IDX656"></a>
+</dt>
+<dd><p>UCD marker: <code>&lt;vertical&gt;</code>.
+Denotes a vertical layout presentation form.
+</p></dd></dl>
+
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_WIDE</b>
+<a name="IDX657"></a>
+</dt>
+<dd><p>UCD marker: <code>&lt;wide&gt;</code>.
+Denotes a wide (or zenkaku) compatibility character.
+</p></dd></dl>
+
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_NARROW</b>
+<a name="IDX658"></a>
+</dt>
+<dd><p>UCD marker: <code>&lt;narrow&gt;</code>.
+Denotes a narrow (or hankaku) compatibility character.
+</p></dd></dl>
+
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_SMALL</b>
+<a name="IDX659"></a>
+</dt>
+<dd><p>UCD marker: <code>&lt;small&gt;</code>.
+Denotes a small variant form (CNS compatibility).
+</p></dd></dl>
+
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_SQUARE</b>
+<a name="IDX660"></a>
+</dt>
+<dd><p>UCD marker: <code>&lt;square&gt;</code>.
+Denotes a CJK squared font variant.
+</p></dd></dl>
+
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_FRACTION</b>
+<a name="IDX661"></a>
+</dt>
+<dd><p>UCD marker: <code>&lt;fraction&gt;</code>.
+Denotes a vulgar fraction form.
+</p></dd></dl>
+
+<dl>
+<dt><u>Constant:</u> int <b>UC_DECOMP_COMPAT</b>
+<a name="IDX662"></a>
+</dt>
+<dd><p>UCD marker: <code>&lt;compat&gt;</code>.
+Denotes an otherwise unspecified compatibility character.
+</p></dd></dl>
+
+<p>The following constant denotes the maximum size of decomposition of a single
+Unicode character.
+</p>
+<dl>
+<dt><u>Macro:</u> unsigned int <b>UC_DECOMPOSITION_MAX_LENGTH</b>
+<a name="IDX663"></a>
+</dt>
+<dd><p>This macro expands to a constant that is the required size of buffer passed to
+the <code>uc_decomposition</code> and <code>uc_canonical_decomposition</code> functions.
+</p></dd></dl>
+
+<p>The following functions decompose a Unicode character.
+</p>
+<dl>
+<dt><u>Function:</u> int <b>uc_decomposition</b><i> (ucs4_t <var>uc</var>, int *<var>decomp_tag</var>, ucs4_t *<var>decomposition</var>)</i>
+<a name="IDX664"></a>
+</dt>
+<dd><p>Returns the character decomposition mapping of the Unicode character <var>uc</var>.
+<var>decomposition</var> must point to an array of at least
+<code>UC_DECOMPOSITION_MAX_LENGTH</code> <code>ucs_t</code> elements.
+</p>
+<p>When a decomposition exists, <code><var>decomposition</var>[0..<var>n</var>-1]</code> and
+<code>*<var>decomp_tag</var></code> are filled and <var>n</var> is returned. Otherwise -1 is
+returned.
+</p></dd></dl>
+
+<dl>
+<dt><u>Function:</u> int <b>uc_canonical_decomposition</b><i> (ucs4_t <var>uc</var>, ucs4_t *<var>decomposition</var>)</i>
+<a name="IDX665"></a>
+</dt>
+<dd><p>Returns the canonical character decomposition mapping of the Unicode character
+<var>uc</var>. <var>decomposition</var> must point to an array of at least
+<code>UC_DECOMPOSITION_MAX_LENGTH</code> <code>ucs_t</code> elements.
+</p>
+<p>When a decomposition exists, <code><var>decomposition</var>[0..<var>n</var>-1]</code> is filled
+and <var>n</var> is returned. Otherwise -1 is returned.
+</p></dd></dl>
+
+<hr size="6">
+<a name="Composition-of-characters"></a>
+<a name="SEC44"></a>
+<h2 class="section"> <a href="libunistring.html#TOC44">12.2 Composition of Unicode characters</a> </h2>
+
+<p>The following function composes a Unicode character from two Unicode
+characters.
+</p>
+<dl>
+<dt><u>Function:</u> ucs4_t <b>uc_composition</b><i> (ucs4_t <var>uc1</var>, ucs4_t <var>uc2</var>)</i>
+<a name="IDX666"></a>
+</dt>
+<dd><p>Attempts to combine the Unicode characters <var>uc1</var>, <var>uc2</var>.
+<var>uc1</var> is known to have canonical combining class 0.
+</p>
+<p>Returns the combination of <var>uc1</var> and <var>uc2</var>, if it exists.
+Returns 0 otherwise.
+</p>
+<p>Not all decompositions can be recombined using this function. See the Unicode
+file &lsquo;<tt>CompositionExclusions.txt</tt>&rsquo; for details.
+</p></dd></dl>
+
+<hr size="6">
+<a name="Normalization-of-strings"></a>
+<a name="SEC45"></a>
+<h2 class="section"> <a href="libunistring.html#TOC45">12.3 Normalization of strings</a> </h2>
+
+<p>The Unicode standard defines four normalization forms for Unicode strings.
+The following type is used to denote a normalization form.
+</p>
+<dl>
+<dt><u>Type:</u> <b>uninorm_t</b>
+<a name="IDX667"></a>
+</dt>
+<dd><p>An object of type <code>uninorm_t</code> denotes a Unicode normalization form.
+This is a scalar type; its values can be compared with <code>==</code>.
+</p></dd></dl>
+
+<p>The following constants denote the four normalization forms.
+</p>
+<dl>
+<dt><u>Macro:</u> uninorm_t <b>UNINORM_NFD</b>
+<a name="IDX668"></a>
+</dt>
+<dd><p>Denotes Normalization form D: canonical decomposition.
+</p></dd></dl>
+
+<dl>
+<dt><u>Macro:</u> uninorm_t <b>UNINORM_NFC</b>
+<a name="IDX669"></a>
+</dt>
+<dd><p>Normalization form C: canonical decomposition, then canonical composition.
+</p></dd></dl>
+
+<dl>
+<dt><u>Macro:</u> uninorm_t <b>UNINORM_NFKD</b>
+<a name="IDX670"></a>
+</dt>
+<dd><p>Normalization form KD: compatibility decomposition.
+</p></dd></dl>
+
+<dl>
+<dt><u>Macro:</u> uninorm_t <b>UNINORM_NFKC</b>
+<a name="IDX671"></a>
+</dt>
+<dd><p>Normalization form KC: compatibility decomposition, then canonical composition.
+</p></dd></dl>
+
+<p>The following functions operate on <code>uninorm_t</code> objects.
+</p>
+<dl>
+<dt><u>Function:</u> bool <b>uninorm_is_compat_decomposing</b><i> (uninorm_t <var>nf</var>)</i>
+<a name="IDX672"></a>
+</dt>
+<dd><p>Tests whether the normalization form <var>nf</var> does compatibility decomposition.
+</p></dd></dl>
+
+<dl>
+<dt><u>Function:</u> bool <b>uninorm_is_composing</b><i> (uninorm_t <var>nf</var>)</i>
+<a name="IDX673"></a>
+</dt>
+<dd><p>Tests whether the normalization form <var>nf</var> includes canonical composition.
+</p></dd></dl>
+
+<dl>
+<dt><u>Function:</u> uninorm_t <b>uninorm_decomposing_form</b><i> (uninorm_t <var>nf</var>)</i>
+<a name="IDX674"></a>
+</dt>
+<dd><p>Returns the decomposing variant of the normalization form <var>nf</var>.
+This maps NFC,NFD → NFD and NFKC,NFKD → NFKD.
+</p></dd></dl>
+
+<p>The following functions apply a Unicode normalization form to a Unicode string.
+</p>
+<dl>
+<dt><u>Function:</u> uint8_t * <b>u8_normalize</b><i> (uninorm_t <var>nf</var>, const uint8_t *<var>s</var>, size_t <var>n</var>, uint8_t *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i>
+<a name="IDX675"></a>
+</dt>
+<dt><u>Function:</u> uint16_t * <b>u16_normalize</b><i> (uninorm_t <var>nf</var>, const uint16_t *<var>s</var>, size_t <var>n</var>, uint16_t *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i>
+<a name="IDX676"></a>
+</dt>
+<dt><u>Function:</u> uint32_t * <b>u32_normalize</b><i> (uninorm_t <var>nf</var>, const uint32_t *<var>s</var>, size_t <var>n</var>, uint32_t *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i>
+<a name="IDX677"></a>
+</dt>
+<dd><p>Returns the specified normalization form of a string.
+</p></dd></dl>
+
+<hr size="6">
+<a name="Normalizing-comparisons"></a>
+<a name="SEC46"></a>
+<h2 class="section"> <a href="libunistring.html#TOC46">12.4 Normalizing comparisons</a> </h2>
+
+<p>The following functions compare Unicode string, ignoring differences in
+normalization.
+</p>
+<dl>
+<dt><u>Function:</u> int <b>u8_normcmp</b><i> (const uint8_t *<var>s1</var>, size_t <var>n1</var>, const uint8_t *<var>s2</var>, size_t <var>n2</var>, uninorm_t <var>nf</var>, int *<var>resultp</var>)</i>
+<a name="IDX678"></a>
+</dt>
+<dt><u>Function:</u> int <b>u16_normcmp</b><i> (const uint16_t *<var>s1</var>, size_t <var>n1</var>, const uint16_t *<var>s2</var>, size_t <var>n2</var>, uninorm_t <var>nf</var>, int *<var>resultp</var>)</i>
+<a name="IDX679"></a>
+</dt>
+<dt><u>Function:</u> int <b>u32_normcmp</b><i> (const uint32_t *<var>s1</var>, size_t <var>n1</var>, const uint32_t *<var>s2</var>, size_t <var>n2</var>, uninorm_t <var>nf</var>, int *<var>resultp</var>)</i>
+<a name="IDX680"></a>
+</dt>
+<dd><p>Compares <var>s1</var> and <var>s2</var>, ignoring differences in normalization.
+</p>
+<p><var>nf</var> must be either <code>UNINORM_NFD</code> or <code>UNINORM_NFKD</code>.
+</p>
+<p>If successful, sets <code>*<var>resultp</var></code> to -1 if <var>s1</var> &lt; <var>s2</var>,
+0 if <var>s1</var> = <var>s2</var>, 1 if <var>s1</var> &gt; <var>s2</var>, and returns 0.
+Upon failure, returns -1 with <code>errno</code> set.
+</p></dd></dl>
+
+<a name="IDX681"></a>
+<a name="IDX682"></a>
+<dl>
+<dt><u>Function:</u> char * <b>u8_normxfrm</b><i> (const uint8_t *<var>s</var>, size_t <var>n</var>, uninorm_t <var>nf</var>, char *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i>
+<a name="IDX683"></a>
+</dt>
+<dt><u>Function:</u> char * <b>u16_normxfrm</b><i> (const uint16_t *<var>s</var>, size_t <var>n</var>, uninorm_t <var>nf</var>, char *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i>
+<a name="IDX684"></a>
+</dt>
+<dt><u>Function:</u> char * <b>u32_normxfrm</b><i> (const uint32_t *<var>s</var>, size_t <var>n</var>, uninorm_t <var>nf</var>, char *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i>
+<a name="IDX685"></a>
+</dt>
+<dd><p>Converts the string <var>s</var> of length <var>n</var> to a NUL-terminated byte
+sequence, in such a way that comparing <code>u8_normxfrm (<var>s1</var>)</code> and
+<code>u8_normxfrm (<var>s2</var>)</code> with the <code>u8_cmp2</code> function is equivalent to
+comparing <var>s1</var> and <var>s2</var> with the <code>u8_normcoll</code> function.
+</p>
+<p><var>nf</var> must be either <code>UNINORM_NFC</code> or <code>UNINORM_NFKC</code>.
+</p></dd></dl>
+
+<dl>
+<dt><u>Function:</u> int <b>u8_normcoll</b><i> (const uint8_t *<var>s1</var>, size_t <var>n1</var>, const uint8_t *<var>s2</var>, size_t <var>n2</var>, uninorm_t <var>nf</var>, int *<var>resultp</var>)</i>
+<a name="IDX686"></a>
+</dt>
+<dt><u>Function:</u> int <b>u16_normcoll</b><i> (const uint16_t *<var>s1</var>, size_t <var>n1</var>, const uint16_t *<var>s2</var>, size_t <var>n2</var>, uninorm_t <var>nf</var>, int *<var>resultp</var>)</i>
+<a name="IDX687"></a>
+</dt>
+<dt><u>Function:</u> int <b>u32_normcoll</b><i> (const uint32_t *<var>s1</var>, size_t <var>n1</var>, const uint32_t *<var>s2</var>, size_t <var>n2</var>, uninorm_t <var>nf</var>, int *<var>resultp</var>)</i>
+<a name="IDX688"></a>
+</dt>
+<dd><p>Compares <var>s1</var> and <var>s2</var>, ignoring differences in normalization, using
+the collation rules of the current locale.
+</p>
+<p><var>nf</var> must be either <code>UNINORM_NFC</code> or <code>UNINORM_NFKC</code>.
+</p>
+<p>If successful, sets <code>*<var>resultp</var></code> to -1 if <var>s1</var> &lt; <var>s2</var>,
+0 if <var>s1</var> = <var>s2</var>, 1 if <var>s1</var> &gt; <var>s2</var>, and returns 0.
+Upon failure, returns -1 with <code>errno</code> set.
+</p></dd></dl>
+
+<hr size="6">
+<a name="Normalization-of-streams"></a>
+<a name="SEC47"></a>
+<h2 class="section"> <a href="libunistring.html#TOC47">12.5 Normalization of streams of Unicode characters</a> </h2>
+
+<p>A &ldquo;stream of Unicode characters&rdquo; is essentially a function that accepts an
+<code>ucs4_t</code> argument repeatedly, optionally combined with a function that
+&ldquo;flushes&rdquo; the stream.
+</p>
+<dl>
+<dt><u>Type:</u> <b>struct uninorm_filter</b>
+<a name="IDX689"></a>
+</dt>
+<dd><p>This is the data type of a stream of Unicode characters that normalizes its
+input according to a given normalization form and passes the normalized
+character sequence to the encapsulated stream of Unicode characters.
+</p></dd></dl>
+
+<dl>
+<dt><u>Function:</u> struct uninorm_filter * <b>uninorm_filter_create</b><i> (uninorm_t <var>nf</var>, int (*<var>stream_func</var>) (void *<var>stream_data</var>, ucs4_t <var>uc</var>), void *<var>stream_data</var>)</i>
+<a name="IDX690"></a>
+</dt>
+<dd><p>Creates and returns a normalization filter for Unicode characters.
+</p>
+<p>The pair (<var>stream_func</var>, <var>stream_data</var>) is the encapsulated stream.
+<code><var>stream_func</var> (<var>stream_data</var>, <var>uc</var>)</code> receives the Unicode
+character <var>uc</var> and returns 0 if successful, or -1 with <code>errno</code> set
+upon failure.
+</p>
+<p>Returns the new filter, or NULL with <code>errno</code> set upon failure.
+</p></dd></dl>
+
+<dl>
+<dt><u>Function:</u> int <b>uninorm_filter_write</b><i> (struct uninorm_filter *<var>filter</var>, ucs4_t <var>uc</var>)</i>
+<a name="IDX691"></a>
+</dt>
+<dd><p>Stuffs a Unicode character into a normalizing filter.
+Returns 0 if successful, or -1 with <code>errno</code> set upon failure.
+</p></dd></dl>
+
+<dl>
+<dt><u>Function:</u> int <b>uninorm_filter_flush</b><i> (struct uninorm_filter *<var>filter</var>)</i>
+<a name="IDX692"></a>
+</dt>
+<dd><p>Brings data buffered in the filter to its destination, the encapsulated stream.
+</p>
+<p>Returns 0 if successful, or -1 with <code>errno</code> set upon failure.
+</p>
+<p>Note! If after calling this function, additional characters are written
+into the filter, the resulting character sequence in the encapsulated stream
+will not necessarily be normalized.
+</p></dd></dl>
+
+<dl>
+<dt><u>Function:</u> int <b>uninorm_filter_free</b><i> (struct uninorm_filter *<var>filter</var>)</i>
+<a name="IDX693"></a>
+</dt>
+<dd><p>Brings data buffered in the filter to its destination, the encapsulated stream,
+then closes and frees the filter.
+</p>
+<p>Returns 0 if successful, or -1 with <code>errno</code> set upon failure.
+</p></dd></dl>
+<hr size="6">
+<table cellpadding="1" cellspacing="1" border="0">
+<tr><td valign="middle" align="left">[<a href="#SEC42" title="Beginning of this chapter or previous chapter"> &lt;&lt; </a>]</td>
+<td valign="middle" align="left">[<a href="libunistring_13.html#SEC48" title="Next chapter"> &gt;&gt; </a>]</td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left">[<a href="libunistring.html#SEC_Top" title="Cover (top) of document">Top</a>]</td>
+<td valign="middle" align="left">[<a href="libunistring.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
+<td valign="middle" align="left">[<a href="libunistring_18.html#SEC71" title="Index">Index</a>]</td>
+<td valign="middle" align="left">[<a href="libunistring_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
+</tr></table>
+<p>
+ <font size="-1">
+ This document was generated by <em>Bruno Haible</em> on <em>July, 1 2009</em> using <a href="http://www.nongnu.org/texi2html/"><em>texi2html 1.78a</em></a>.
+ </font>
+ <br>
+
+</p>
+</body>
+</html>