.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
.\"
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
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.\" References consulted:
.\"   GNU glibc-2 source code and manual
.\"   OpenGroup's Single Unix specification http://www.UNIX-systems.org/online.html
.\"
.TH ICONV_OPEN 3  "January 18, 2000" "GNU" "Linux Programmer's Manual"
.SH NAME
iconv_open \- allocate descriptor for character set conversion
.SH SYNOPSIS
.nf
.B #include <iconv.h>
.sp
.BI "iconv_t iconv_open (const char* " tocode ", const char* " fromcode );
.fi
.SH DESCRIPTION
The \fBiconv_open\fP function allocates a conversion descriptor suitable
for converting byte sequences from character encoding \fIfromcode\fP to
character encoding \fItocode\fP.
.PP
The values permitted for \fIfromcode\fP and \fItocode\fP and the supported
combinations are system dependent. For the libiconv library, the following
encodings are supported, in all combinations.
.TP
European languages
ASCII, ISO-8859-{1,2,3,4,5,7,9,10,13,14,15,16},
KOI8-R, KOI8-U, KOI8-RU,
CP{1250,1251,1252,1253,1254,1257}, CP{850,866},
Mac{Roman,CentralEurope,Iceland,Croatian,Romania},
Mac{Cyrillic,Ukraine,Greek,Turkish},
Macintosh
.TP
Semitic languages
ISO-8859-{6,8}, CP{1255,1256}, Mac{Hebrew,Arabic}
.TP
Japanese
EUC-JP, SHIFT-JIS, CP932, ISO-2022-JP, ISO-2022-JP-2, ISO-2022-JP-1
.TP
Chinese
EUC-CN, HZ, GBK, EUC-TW, BIG5, CP950, ISO-2022-CN, ISO-2022-CN-EXT
.TP
Korean
EUC-KR, CP949, ISO-2022-KR
.TP
Armenian
ARMSCII-8
.TP
Georgian
Georgian-Academy, Georgian-PS
.TP
Thai
TIS-620, CP874, MacThai
.TP
Laotian
MuleLao-1, CP1133
.TP
Vietnamese
VISCII, TCVN, CP1258
.TP
Platform specifics
HP-ROMAN8, NEXTSTEP
.TP
Full Unicode
UTF-8, UCS-2, UCS-4, UTF-16, UTF-7, JAVA
.TP
Full Unicode, in terms of \fBuint16_t\fP or \fBuint32_t\fP
(with machine dependent endianness and alignment)
UCS-2-INTERNAL, UCS-4-INTERNAL
.PP
The resulting conversion descriptor can be used with \fBiconv\fP any number
of times. It remains valid until deallocated using \fBiconv_close\fP.
.PP
A conversion descriptor contains a conversion state. After creation using
\fBiconv_open\fP, the state is in the initial state. Using \fBiconv\fP
modifies the descriptor's conversion state. (This implies that a conversion
descriptor can not be used in multiple threads simultaneously.) To bring the
state back to the initial state, use \fBiconv\fP with NULL as \fIinbuf\fP
argument.
.SH "RETURN VALUE"
The \fBiconv_open\fP function returns a freshly allocated conversion
descriptor. In case of error, it sets \fBerrno\fP and returns (iconv_t)(-1).
.SH ERRORS
The following error can occur, among others:
.TP
.B EINVAL
The conversion from \fIfromcode\fP to \fItocode\fP is not supported by the
implementation.
.SH "CONFORMING TO"
UNIX98
.SH "SEE ALSO"
.BR iconv "(3), " iconv_close (3)