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<title>GNU libunistring: 9. Display width <uniwidth.h></title>
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<table cellpadding="1" cellspacing="1" border="0">
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<tr><td valign="middle" align="left">[<a href="libunistring_8.html#SEC33" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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<td valign="middle" align="left">[<a href="libunistring_10.html#SEC54" title="Next chapter"> >> </a>]</td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left">[<a href="libunistring_toc.html#SEC_Top" title="Cover (top) of document">Top</a>]</td>
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<td valign="middle" align="left">[<a href="libunistring_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
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<td valign="middle" align="left">[<a href="libunistring_21.html#SEC92" title="Index">Index</a>]</td>
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<td valign="middle" align="left">[<a href="libunistring_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
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</tr></table>
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<hr size="2">
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<a name="uniwidth_002eh"></a>
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<a name="SEC53"></a>
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<h1 class="chapter"> <a href="libunistring_toc.html#TOC53">9. Display width <code><uniwidth.h></code></a> </h1>
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<p>This include file declares functions that return the display width, measured
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in columns, of characters or strings, when output to a device that uses
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non-proportional fonts.
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</p>
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<a name="IDX758"></a>
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<p>Note that for some rarely used characters the actual fonts or terminal
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emulators can use a different width. There is no mechanism for communicating
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the display width of characters across a Unix pseudo-terminal (tty). Also,
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there are scripts with complex rendering, like the Indic scripts. For these
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scripts, there is no such concept as non-proportional fonts. Therefore
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the results of these functions usually work fine on most scripts and on
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most characters but can fail to represent the actual display width.
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</p>
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<p>These functions are locale dependent. The <var>encoding</var> argument identifies
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the encoding (e.g. <code>"ISO-8859-2"</code> for Polish).
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</p>
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<a name="IDX759"></a>
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<a name="IDX760"></a>
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<a name="IDX761"></a>
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<dl>
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<dt><u>Function:</u> int <b>uc_width</b><i> (ucs4_t <var>uc</var>, const char *<var>encoding</var>)</i>
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<a name="IDX762"></a>
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</dt>
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<dd><p>Determines and returns the number of column positions required for <var>uc</var>.
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Returns -1 if <var>uc</var> is a control character that has an influence on the
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column position when output.
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</p></dd></dl>
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<dl>
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<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>
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<a name="IDX763"></a>
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</dt>
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<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>
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<a name="IDX764"></a>
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</dt>
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<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>
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<a name="IDX765"></a>
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</dt>
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<dd><p>Determines and returns the number of column positions required for first
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<var>n</var> units (or fewer if <var>s</var> ends before this) in <var>s</var>. This
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function ignores control characters in the string.
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</p></dd></dl>
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<dl>
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<dt><u>Function:</u> int <b>u8_strwidth</b><i> (const uint8_t *<var>s</var>, const char *<var>encoding</var>)</i>
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<a name="IDX766"></a>
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</dt>
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<dt><u>Function:</u> int <b>u16_strwidth</b><i> (const uint16_t *<var>s</var>, const char *<var>encoding</var>)</i>
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<a name="IDX767"></a>
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</dt>
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<dt><u>Function:</u> int <b>u32_strwidth</b><i> (const uint32_t *<var>s</var>, const char *<var>encoding</var>)</i>
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<a name="IDX768"></a>
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</dt>
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<dd><p>Determines and returns the number of column positions required for <var>s</var>.
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This function ignores control characters in the string.
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</p></dd></dl>
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<hr size="6">
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<table cellpadding="1" cellspacing="1" border="0">
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<tr><td valign="middle" align="left">[<a href="libunistring_8.html#SEC33" title="Beginning of this chapter or previous chapter"> << </a>]</td>
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<td valign="middle" align="left">[<a href="libunistring_10.html#SEC54" title="Next chapter"> >> </a>]</td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left"> </td>
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<td valign="middle" align="left">[<a href="libunistring_toc.html#SEC_Top" title="Cover (top) of document">Top</a>]</td>
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<td valign="middle" align="left">[<a href="libunistring_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
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<td valign="middle" align="left">[<a href="libunistring_21.html#SEC92" title="Index">Index</a>]</td>
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<td valign="middle" align="left">[<a href="libunistring_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
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</tr></table>
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<p>
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