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Code Editor : iconv.3.html
<!-- Creator : groff version 1.22.3 --> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta name="generator" content="groff -Thtml, see www.gnu.org"> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <meta name="Content-Style" content="text/css"> <style type="text/css"> p { margin-top: 0; margin-bottom: 0; vertical-align: top } pre { margin-top: 0; margin-bottom: 0; vertical-align: top } table { margin-top: 0; margin-bottom: 0; vertical-align: top } h1 { text-align: center } </style> <title>ICONV</title> </head> <body> <h1 align="center">ICONV</h1> <a href="#NAME">NAME</a><br> <a href="#SYNOPSIS">SYNOPSIS</a><br> <a href="#DESCRIPTION">DESCRIPTION</a><br> <a href="#RETURN VALUE">RETURN VALUE</a><br> <a href="#ERRORS">ERRORS</a><br> <a href="#CONFORMING TO">CONFORMING TO</a><br> <a href="#SEE ALSO">SEE ALSO</a><br> <hr> <h2>NAME <a name="NAME"></a> </h2> <p style="margin-left:11%; margin-top: 1em">iconv − perform character set conversion</p> <h2>SYNOPSIS <a name="SYNOPSIS"></a> </h2> <p style="margin-left:11%; margin-top: 1em"><b>#include <iconv.h></b></p> <p style="margin-left:11%; margin-top: 1em"><b>size_t iconv (iconv_t</b> <i>cd</i><b>, <br> const char* *</b> <i>inbuf</i><b>, size_t *</b> <i>inbytesleft</i><b>, <br> char* *</b> <i>outbuf</i><b>, size_t *</b> <i>outbytesleft</i><b>);</b></p> <h2>DESCRIPTION <a name="DESCRIPTION"></a> </h2> <p style="margin-left:11%; margin-top: 1em">The argument <i>cd</i> must be a conversion descriptor created using the function <b>iconv_open</b>.</p> <p style="margin-left:11%; margin-top: 1em">The main case is when <i>inbuf</i> is not NULL and <i>*inbuf</i> is not NULL. In this case, the <b>iconv</b> function converts the multibyte sequence starting at <i>*inbuf</i> to a multibyte sequence starting at <i>*outbuf</i>. At most <i>*inbytesleft</i> bytes, starting at <i>*inbuf</i>, will be read. At most <i>*outbytesleft</i> bytes, starting at <i>*outbuf</i>, will be written.</p> <p style="margin-left:11%; margin-top: 1em">The <b>iconv</b> function converts one multibyte character at a time, and for each character conversion it increments <i>*inbuf</i> and decrements <i>*inbytesleft</i> by the number of converted input bytes, it increments <i>*outbuf</i> and decrements <i>*outbytesleft</i> by the number of converted output bytes, and it updates the conversion state contained in <i>cd</i>. If the character encoding of the input is stateful, the <b>iconv</b> function can also convert a sequence of input bytes to an update of the conversion state without producing any output bytes; such input is called a <i>shift sequence</i>. The conversion can stop for four reasons:</p> <p style="margin-left:11%; margin-top: 1em">1. An invalid multibyte sequence is encountered in the input. In this case it sets <b>errno</b> to <b>EILSEQ</b> and returns (size_t)(−1). <i>*inbuf</i> is left pointing to the beginning of the invalid multibyte sequence.</p> <p style="margin-left:11%; margin-top: 1em">2. The input byte sequence has been entirely converted, i.e. <i>*inbytesleft</i> has gone down to 0. In this case <b>iconv</b> returns the number of non-reversible conversions performed during this call.</p> <p style="margin-left:11%; margin-top: 1em">3. An incomplete multibyte sequence is encountered in the input, and the input byte sequence terminates after it. In this case it sets <b>errno</b> to <b>EINVAL</b> and returns (size_t)(−1). <i>*inbuf</i> is left pointing to the beginning of the incomplete multibyte sequence.</p> <p style="margin-left:11%; margin-top: 1em">4. The output buffer has no more room for the next converted character. In this case it sets <b>errno</b> to <b>E2BIG</b> and returns (size_t)(−1).</p> <p style="margin-left:11%; margin-top: 1em">A different case is when <i>inbuf</i> is NULL or <i>*inbuf</i> is NULL, but <i>outbuf</i> is not NULL and <i>*outbuf</i> is not NULL. In this case, the <b>iconv</b> function attempts to set <i>cd</i>’s conversion state to the initial state and store a corresponding shift sequence at <i>*outbuf</i>. At most <i>*outbytesleft</i> bytes, starting at <i>*outbuf</i>, will be written. If the output buffer has no more room for this reset sequence, it sets <b>errno</b> to <b>E2BIG</b> and returns (size_t)(−1). Otherwise it increments <i>*outbuf</i> and decrements <i>*outbytesleft</i> by the number of bytes written.</p> <p style="margin-left:11%; margin-top: 1em">A third case is when <i>inbuf</i> is NULL or <i>*inbuf</i> is NULL, and <i>outbuf</i> is NULL or <i>*outbuf</i> is NULL. In this case, the <b>iconv</b> function sets <i>cd</i>’s conversion state to the initial state.</p> <h2>RETURN VALUE <a name="RETURN VALUE"></a> </h2> <p style="margin-left:11%; margin-top: 1em">The <b>iconv</b> function returns the number of characters converted in a non-reversible way during this call; reversible conversions are not counted. In case of error, it sets <b>errno</b> and returns (size_t)(−1).</p> <h2>ERRORS <a name="ERRORS"></a> </h2> <p style="margin-left:11%; margin-top: 1em">The following errors can occur, among others:</p> <table width="100%" border="0" rules="none" frame="void" cellspacing="0" cellpadding="0"> <tr valign="top" align="left"> <td width="11%"></td> <td width="9%"> <p><b>E2BIG</b></p></td> <td width="2%"></td> <td width="78%"> <p>There is not sufficient room at <i>*outbuf</i>.</p></td></tr> <tr valign="top" align="left"> <td width="11%"></td> <td width="9%"> <p><b>EILSEQ</b></p></td> <td width="2%"></td> <td width="78%"> <p>An invalid multibyte sequence has been encountered in the input.</p></td></tr> <tr valign="top" align="left"> <td width="11%"></td> <td width="9%"> <p><b>EINVAL</b></p></td> <td width="2%"></td> <td width="78%"> <p>An incomplete multibyte sequence has been encountered in the input.</p></td></tr> </table> <h2>CONFORMING TO <a name="CONFORMING TO"></a> </h2> <p style="margin-left:11%; margin-top: 1em">POSIX:2001</p> <h2>SEE ALSO <a name="SEE ALSO"></a> </h2> <p style="margin-left:11%; margin-top: 1em"><b>iconv_open</b>(3), <b>iconvctl</b>(3) <b>iconv_close</b>(3)</p> <hr> </body> </html>
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