<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html401/loose.dtd"> <html> <!-- Created on November, 30 2017 by texi2html 1.78a --> <!-- Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author) Karl Berry <karl@freefriends.org> Olaf Bachmann <obachman@mathematik.uni-kl.de> and many others. Maintained by: Many creative people. Send bugs and suggestions to <texi2html-bug@nongnu.org> --> <head> <title>GNU libunistring: 5. Conversions between Unicode and encodings <uniconv.h></title> <meta name="description" content="GNU libunistring: 5. Conversions between Unicode and encodings <uniconv.h>"> <meta name="keywords" content="GNU libunistring: 5. Conversions between Unicode and encodings <uniconv.h>"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="texi2html 1.78a"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <style type="text/css"> <!-- a.summary-letter {text-decoration: none} pre.display {font-family: serif} pre.format {font-family: serif} pre.menu-comment {font-family: serif} pre.menu-preformatted {font-family: serif} pre.smalldisplay {font-family: serif; font-size: smaller} pre.smallexample {font-size: smaller} pre.smallformat {font-family: serif; font-size: smaller} pre.smalllisp {font-size: smaller} span.roman {font-family:serif; font-weight:normal;} span.sansserif {font-family:sans-serif; font-weight:normal;} ul.toc {list-style: none} --> </style> </head> <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> <table cellpadding="1" cellspacing="1" border="0"> <tr><td valign="middle" align="left">[<a href="libunistring_4.html#SEC11" title="Beginning of this chapter or previous chapter"> << </a>]</td> <td valign="middle" align="left">[<a href="libunistring_6.html#SEC18" title="Next chapter"> >> </a>]</td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </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_19.html#SEC77" 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="uniconv_002eh"></a> <a name="SEC17"></a> <h1 class="chapter"> <a href="libunistring.html#TOC17">5. Conversions between Unicode and encodings <code><uniconv.h></code></a> </h1> <p>This include file declares functions for converting between Unicode strings and <code>char *</code> strings in locale encoding or in other specified encodings. </p> <a name="IDX154"></a> <p>The following function returns the locale encoding. </p> <dl> <dt><u>Function:</u> const char * <b>locale_charset</b><i> ()</i> <a name="IDX155"></a> </dt> <dd><p>Determines the current locale's character encoding, and canonicalizes it into one of the canonical names listed in ‘<tt>config.charset</tt>’. If the canonical name cannot be determined, the result is a non-canonical name. </p> <p>The result must not be freed; it is statically allocated. </p> <p>The result of this function can be used as an argument to the <code>iconv_open</code> function in GNU libc, in GNU libiconv, or in the gnulib provided wrapper around the native <code>iconv_open</code> function. It may not work as an argument to the native <code>iconv_open</code> function directly. </p></dd></dl> <p>The handling of unconvertible characters during the conversions can be parametrized through the following enumeration type: </p> <dl> <dt><u>Type:</u> <b>enum iconv_ilseq_handler</b> <a name="IDX156"></a> </dt> <dd><p>This type specifies how unconvertible characters in the input are handled. </p></dd></dl> <dl> <dt><u>Constant:</u> enum iconv_ilseq_handler <b>iconveh_error</b> <a name="IDX157"></a> </dt> <dd><p>This handler causes the function to return with <code>errno</code> set to <code>EILSEQ</code>. </p></dd></dl> <dl> <dt><u>Constant:</u> enum iconv_ilseq_handler <b>iconveh_question_mark</b> <a name="IDX158"></a> </dt> <dd><p>This handler produces one question mark ‘<samp>?</samp>’ per unconvertible character. </p></dd></dl> <dl> <dt><u>Constant:</u> enum iconv_ilseq_handler <b>iconveh_escape_sequence</b> <a name="IDX159"></a> </dt> <dd><p>This handler produces an escape sequence <code>\u<var>xxxx</var></code> or <code>\U<var>xxxxxxxx</var></code> for each unconvertible character. </p></dd></dl> <a name="IDX160"></a> <p>The following functions convert between strings in a specified encoding and Unicode strings. </p> <dl> <dt><u>Function:</u> uint8_t * <b>u8_conv_from_encoding</b><i> (const char *<var>fromcode</var>, enum iconv_ilseq_handler <var>handler</var>, const char *<var>src</var>, size_t <var>srclen</var>, size_t *<var>offsets</var>, uint8_t *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i> <a name="IDX161"></a> </dt> <dt><u>Function:</u> uint16_t * <b>u16_conv_from_encoding</b><i> (const char *<var>fromcode</var>, enum iconv_ilseq_handler <var>handler</var>, const char *<var>src</var>, size_t <var>srclen</var>, size_t *<var>offsets</var>, uint16_t *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i> <a name="IDX162"></a> </dt> <dt><u>Function:</u> uint32_t * <b>u32_conv_from_encoding</b><i> (const char *<var>fromcode</var>, enum iconv_ilseq_handler <var>handler</var>, const char *<var>src</var>, size_t <var>srclen</var>, size_t *<var>offsets</var>, uint32_t *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i> <a name="IDX163"></a> </dt> <dd><p>Converts an entire string, possibly including NUL bytes, from one encoding to UTF-8 encoding. </p> <p>Converts a memory region given in encoding <var>fromcode</var>. <var>fromcode</var> is as for the <code>iconv_open</code> function. </p> <p>The input is in the memory region between <var>src</var> (inclusive) and <code><var>src</var> + <var>srclen</var></code> (exclusive). </p> <p>If <var>offsets</var> is not NULL, it should point to an array of <var>srclen</var> integers; this array is filled with offsets into the result, i.e. the character starting at <code><var>src</var>[i]</code> corresponds to the character starting at <code><var>result</var>[<var>offsets</var>[i]]</code>, and other offsets are set to <code>(size_t)(-1)</code>. </p> <p><code><var>resultbuf</var></code> and <code>*<var>lengthp</var></code> should be a scratch buffer and its size, or <code><var>resultbuf</var></code> can be NULL. </p> <p>May erase the contents of the memory at <code><var>resultbuf</var></code>. </p> <p>If successful: The resulting Unicode string (non-NULL) is returned and its length stored in <code>*<var>lengthp</var></code>. The resulting string is <code><var>resultbuf</var></code> if no dynamic memory allocation was necessary, or a freshly allocated memory block otherwise. </p> <p>In case of error: NULL is returned and <code>errno</code> is set. Particular <code>errno</code> values: <code>EINVAL</code>, <code>EILSEQ</code>, <code>ENOMEM</code>. </p></dd></dl> <dl> <dt><u>Function:</u> char * <b>u8_conv_to_encoding</b><i> (const char *<var>tocode</var>, enum iconv_ilseq_handler <var>handler</var>, const uint8_t *<var>src</var>, size_t <var>srclen</var>, size_t *<var>offsets</var>, char *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i> <a name="IDX164"></a> </dt> <dt><u>Function:</u> char * <b>u16_conv_to_encoding</b><i> (const char *<var>tocode</var>, enum iconv_ilseq_handler <var>handler</var>, const uint16_t *<var>src</var>, size_t <var>srclen</var>, size_t *<var>offsets</var>, char *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i> <a name="IDX165"></a> </dt> <dt><u>Function:</u> char * <b>u32_conv_to_encoding</b><i> (const char *<var>tocode</var>, enum iconv_ilseq_handler <var>handler</var>, const uint32_t *<var>src</var>, size_t <var>srclen</var>, size_t *<var>offsets</var>, char *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i> <a name="IDX166"></a> </dt> <dd><p>Converts an entire Unicode string, possibly including NUL units, from UTF-8 encoding to a given encoding. </p> <p>Converts a memory region to encoding <var>tocode</var>. <var>tocode</var> is as for the <code>iconv_open</code> function. </p> <p>The input is in the memory region between <var>src</var> (inclusive) and <code><var>src</var> + <var>srclen</var></code> (exclusive). </p> <p>If <var>offsets</var> is not NULL, it should point to an array of <var>srclen</var> integers; this array is filled with offsets into the result, i.e. the character starting at <code><var>src</var>[i]</code> corresponds to the character starting at <code><var>result</var>[<var>offsets</var>[i]]</code>, and other offsets are set to <code>(size_t)(-1)</code>. </p> <p><code><var>resultbuf</var></code> and <code>*<var>lengthp</var></code> should be a scratch buffer and its size, or <code><var>resultbuf</var></code> can be NULL. </p> <p>May erase the contents of the memory at <code><var>resultbuf</var></code>. </p> <p>If successful: The resulting Unicode string (non-NULL) is returned and its length stored in <code>*<var>lengthp</var></code>. The resulting string is <code><var>resultbuf</var></code> if no dynamic memory allocation was necessary, or a freshly allocated memory block otherwise. </p> <p>In case of error: NULL is returned and <code>errno</code> is set. Particular <code>errno</code> values: <code>EINVAL</code>, <code>EILSEQ</code>, <code>ENOMEM</code>. </p></dd></dl> <p>The following functions convert between NUL terminated strings in a specified encoding and NUL terminated Unicode strings. </p> <dl> <dt><u>Function:</u> uint8_t * <b>u8_strconv_from_encoding</b><i> (const char *<var>string</var>, const char *<var>fromcode</var>, enum iconv_ilseq_handler <var>handler</var>)</i> <a name="IDX167"></a> </dt> <dt><u>Function:</u> uint16_t * <b>u16_strconv_from_encoding</b><i> (const char *<var>string</var>, const char *<var>fromcode</var>, enum iconv_ilseq_handler <var>handler</var>)</i> <a name="IDX168"></a> </dt> <dt><u>Function:</u> uint32_t * <b>u32_strconv_from_encoding</b><i> (const char *<var>string</var>, const char *<var>fromcode</var>, enum iconv_ilseq_handler <var>handler</var>)</i> <a name="IDX169"></a> </dt> <dd><p>Converts a NUL terminated string from a given encoding. </p> <p>The result is <code>malloc</code> allocated, or NULL (with <var>errno</var> set) in case of error. </p> <p>Particular <code>errno</code> values: <code>EILSEQ</code>, <code>ENOMEM</code>. </p></dd></dl> <dl> <dt><u>Function:</u> char * <b>u8_strconv_to_encoding</b><i> (const uint8_t *<var>string</var>, const char *<var>tocode</var>, enum iconv_ilseq_handler <var>handler</var>)</i> <a name="IDX170"></a> </dt> <dt><u>Function:</u> char * <b>u16_strconv_to_encoding</b><i> (const uint16_t *<var>string</var>, const char *<var>tocode</var>, enum iconv_ilseq_handler <var>handler</var>)</i> <a name="IDX171"></a> </dt> <dt><u>Function:</u> char * <b>u32_strconv_to_encoding</b><i> (const uint32_t *<var>string</var>, const char *<var>tocode</var>, enum iconv_ilseq_handler <var>handler</var>)</i> <a name="IDX172"></a> </dt> <dd><p>Converts a NUL terminated string to a given encoding. </p> <p>The result is <code>malloc</code> allocated, or NULL (with <code>errno</code> set) in case of error. </p> <p>Particular <code>errno</code> values: <code>EILSEQ</code>, <code>ENOMEM</code>. </p></dd></dl> <p>The following functions are shorthands that convert between NUL terminated strings in locale encoding and NUL terminated Unicode strings. </p> <dl> <dt><u>Function:</u> uint8_t * <b>u8_strconv_from_locale</b><i> (const char *<var>string</var>)</i> <a name="IDX173"></a> </dt> <dt><u>Function:</u> uint16_t * <b>u16_strconv_from_locale</b><i> (const char *<var>string</var>)</i> <a name="IDX174"></a> </dt> <dt><u>Function:</u> uint32_t * <b>u32_strconv_from_locale</b><i> (const char *<var>string</var>)</i> <a name="IDX175"></a> </dt> <dd><p>Converts a NUL terminated string from the locale encoding. </p> <p>The result is <code>malloc</code> allocated, or NULL (with <code>errno</code> set) in case of error. </p> <p>Particular <code>errno</code> values: <code>ENOMEM</code>. </p></dd></dl> <dl> <dt><u>Function:</u> char * <b>u8_strconv_to_locale</b><i> (const uint8_t *<var>string</var>)</i> <a name="IDX176"></a> </dt> <dt><u>Function:</u> char * <b>u16_strconv_to_locale</b><i> (const uint16_t *<var>string</var>)</i> <a name="IDX177"></a> </dt> <dt><u>Function:</u> char * <b>u32_strconv_to_locale</b><i> (const uint32_t *<var>string</var>)</i> <a name="IDX178"></a> </dt> <dd><p>Converts a NUL terminated string to the locale encoding. </p> <p>The result is <code>malloc</code> allocated, or NULL (with <code>errno</code> set) in case of error. </p> <p>Particular <code>errno</code> values: <code>ENOMEM</code>. </p></dd></dl> <hr size="6"> <table cellpadding="1" cellspacing="1" border="0"> <tr><td valign="middle" align="left">[<a href="libunistring_4.html#SEC11" title="Beginning of this chapter or previous chapter"> << </a>]</td> <td valign="middle" align="left">[<a href="libunistring_6.html#SEC18" title="Next chapter"> >> </a>]</td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </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_19.html#SEC77" 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>Daiki Ueno</em> on <em>November, 30 2017</em> using <a href="http://www.nongnu.org/texi2html/"><em>texi2html 1.78a</em></a>. </font> <br> </p> </body> </html>