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.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
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.\"
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" References consulted:
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.\" GNU glibc-2 source code and manual
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.\" OpenGroup's Single Unix specification http://www.UNIX-systems.org/online.html
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.\"
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.TH ICONV_OPEN 3 1999-11-27 "GNU" "Linux Programmer's Manual"
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.SH NAME
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iconv_open \- allocate descriptor for character set conversion
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.SH SYNOPSIS
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.nf
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.B #include <iconv.h>
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.sp
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.BI "iconv_t iconv_open(const char *" tocode ", const char *" fromcode );
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.fi
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.SH DESCRIPTION
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2005-10-19 06:54:38 +00:00
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The \fBiconv_open\fP() function allocates a conversion descriptor suitable
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for converting byte sequences from character encoding \fIfromcode\fP to
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character encoding \fItocode\fP.
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.PP
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The values permitted for \fIfromcode\fP and \fItocode\fP and the supported
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2007-04-12 22:42:49 +00:00
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combinations are system dependent.
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For the GNU C library, the permitted
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2005-07-06 08:00:30 +00:00
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values are listed by the \fBiconv \-\-list\fP command, and all combinations
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of the listed values are supported.
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.PP
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2005-10-19 08:35:30 +00:00
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The resulting conversion descriptor can be used with \fBiconv\fP() any number
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of times.
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It remains valid until deallocated using \fBiconv_close\fP().
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.PP
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2007-04-12 22:42:49 +00:00
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A conversion descriptor contains a conversion state.
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After creation using
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\fBiconv_open\fP(), the state is in the initial state.
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Using \fBiconv\fP()
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modifies the descriptor's conversion state.
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(This implies that a conversion
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descriptor can not be used in multiple threads simultaneously.)
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To bring the state back to the initial state, use \fBiconv\fP()
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with NULL as \fIinbuf\fP argument.
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.SH "RETURN VALUE"
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The \fBiconv_open\fP() function returns a freshly allocated conversion
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descriptor.
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In case of error, it sets \fIerrno\fP and returns (iconv_t)(\-1).
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.SH ERRORS
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The following error can occur, among others:
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.TP
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.B EINVAL
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The conversion from \fIfromcode\fP to \fItocode\fP is not supported by the
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implementation.
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.SH "CONFORMING TO"
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2006-08-03 13:57:30 +00:00
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UNIX98, POSIX.1-2001.
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.SH "SEE ALSO"
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.BR iconv (1),
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.BR iconv (3),
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.BR iconv_close (3)
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