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+.\" 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
+.\" published by the Free Software Foundation; either version 2 of
+.\" the License, or (at your option) any later version.
+.\"
+.\" 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 1999-11-27 "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 GNU C library, the permitted
+values are listed by the \fBiconv --list\fP command, and all combinations
+of the listed values are supported.
+.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 (1),
+.BR iconv (3),
+.BR iconv_close (3)