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authorAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:32:44 +0200
committerAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:32:44 +0200
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+Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author)
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+<head>
+<title>GNU libunistring: 9. Display width &lt;uniwidth.h&gt;</title>
+
+<meta name="description" content="GNU libunistring: 9. Display width &lt;uniwidth.h&gt;">
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+<table cellpadding="1" cellspacing="1" border="0">
+<tr><td valign="middle" align="left">[<a href="libunistring_8.html#SEC20" title="Beginning of this chapter or previous chapter"> &lt;&lt; </a>]</td>
+<td valign="middle" align="left">[<a href="libunistring_10.html#SEC38" 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="uniwidth_002eh"></a>
+<a name="SEC37"></a>
+<h1 class="chapter"> <a href="libunistring.html#TOC37">9. Display width <code>&lt;uniwidth.h&gt;</code></a> </h1>
+
+<p>This include file declares functions that return the display width, measured
+in columns, of characters or strings, when output to a device that uses
+non-proportional fonts.
+</p>
+<a name="IDX604"></a>
+<p>Note that for some rarely used characters the actual fonts or terminal
+emulators can use a different width. There is no mechanism for communicating
+the display width of characters across a Unix pseudo-terminal (tty). Also,
+there are scripts with complex rendering, like the Indic scripts. For these
+scripts, there is no such concept as non-proportional fonts. Therefore
+the results of these functions usually work fine on most scripts and on
+most characters but can fail to represent the actual display width.
+</p>
+<p>These functions are locale dependent. The <var>encoding</var> argument identifies
+the encoding (e.g. <code>&quot;ISO-8859-2&quot;</code> for Polish).
+</p>
+<a name="IDX605"></a>
+<a name="IDX606"></a>
+<a name="IDX607"></a>
+<dl>
+<dt><u>Function:</u> int <b>uc_width</b><i> (ucs4_t <var>uc</var>, const char *<var>encoding</var>)</i>
+<a name="IDX608"></a>
+</dt>
+<dd><p>Determines and returns the number of column positions required for <var>uc</var>.
+Returns -1 if <var>uc</var> is a control character that has an influence on the
+column position when output.
+</p></dd></dl>
+
+<dl>
+<dt><u>Function:</u> int <b>u8_width</b><i> (const uint8_t *<var>s</var>, size_t <var>n</var>, const char *<var>encoding</var>)</i>
+<a name="IDX609"></a>
+</dt>
+<dt><u>Function:</u> int <b>u16_width</b><i> (const uint16_t *<var>s</var>, size_t <var>n</var>, const char *<var>encoding</var>)</i>
+<a name="IDX610"></a>
+</dt>
+<dt><u>Function:</u> int <b>u32_width</b><i> (const uint32_t *<var>s</var>, size_t <var>n</var>, const char *<var>encoding</var>)</i>
+<a name="IDX611"></a>
+</dt>
+<dd><p>Determines and returns the number of column positions required for first
+<var>n</var> units (or fewer if <var>s</var> ends before this) in <var>s</var>. This
+function ignores control characters in the string.
+</p></dd></dl>
+
+<dl>
+<dt><u>Function:</u> int <b>u8_strwidth</b><i> (const uint8_t *<var>s</var>, const char *<var>encoding</var>)</i>
+<a name="IDX612"></a>
+</dt>
+<dt><u>Function:</u> int <b>u16_strwidth</b><i> (const uint16_t *<var>s</var>, const char *<var>encoding</var>)</i>
+<a name="IDX613"></a>
+</dt>
+<dt><u>Function:</u> int <b>u32_strwidth</b><i> (const uint32_t *<var>s</var>, const char *<var>encoding</var>)</i>
+<a name="IDX614"></a>
+</dt>
+<dd><p>Determines and returns the number of column positions required for <var>s</var>.
+This function ignores control characters in the string.
+</p></dd></dl>
+<hr size="6">
+<table cellpadding="1" cellspacing="1" border="0">
+<tr><td valign="middle" align="left">[<a href="libunistring_8.html#SEC20" title="Beginning of this chapter or previous chapter"> &lt;&lt; </a>]</td>
+<td valign="middle" align="left">[<a href="libunistring_10.html#SEC38" 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">
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