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when there is an invalid character in the output codeset while it is valid in the input. However, POSIX requires iconv() to perform an implementation-defined conversion on the character. So, Citrus iconv converts such a character to a special character which means it is invalid in the output codeset. This is not a problem in most cases but some software like libxml2 depends on GNU's behavior to determine if a character is output as-is or another form such as a character entity (&#NNN;).
190 lines
5.7 KiB
Groff
190 lines
5.7 KiB
Groff
.\" Copyright (c) 2009 Gabor Kovesdan <gabor@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" Portions of this text are reprinted and reproduced in electronic form
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.\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
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.\" Portable Operating System Interface (POSIX), The Open Group Base
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.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
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.\" Electrical and Electronics Engineers, Inc and The Open Group. In the
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.\" event of any discrepancy between this version and the original IEEE and
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.\" The Open Group Standard, the original IEEE and The Open Group Standard is
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.\" the referee document. The original Standard can be obtained online at
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.\" http://www.opengroup.org/unix/online.html.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd November 25, 2009
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.Dt ICONVCTL 3
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.Os
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.Sh NAME
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.Nm iconvctl
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.Nd controlling and diagnostical facility for
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.Xr iconv 3
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In iconv.h
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.Ft int
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.Fn iconvctl "iconv_t cd" "int request" "void *argument"
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.Sh DESCRIPTION
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The
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.Fn iconvctl
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function can retrieve or set specific conversion
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setting from the
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.Fa cd
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conversion descriptor.
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The
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.Fa request
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parameter specifies the operation to accomplish and
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.Fa argument
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is an operation-specific argument.
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.Pp
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The possible operations are the following:
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.Bl -tag -width indent
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.It ICONV_TRIVIALP
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In this case
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.Fa argument
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is an
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.Ft int *
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variable, which is set to 1 if the encoding is trivial one, i.e.
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the input and output encodings are the same.
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Otherwise, the variable will be 0.
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.It ICONV_GET_TRANSLITERATE
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Determines if transliteration is enabled.
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The answer is stored in
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.Fa argument ,
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which is of
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.Ft int * .
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It will be set to 1 if this feature is enabled or set to 0 otherwise.
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.It ICONV_SET_TRANSLITERATE
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Enables transliteration if
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.Fa argument ,
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which is of
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.Ft int *
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set to 1 or disables it if
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.Fa argument
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is set to 0.
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.It ICONV_GET_DISCARD_ILSEQ
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Determines if illegal sequences are discarded or not.
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The answer is stored in
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.Fa argument ,
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which is of
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.Ft int * .
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It will be set to 1 if this feature is enabled or set to 0 otherwise.
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.It ICONV_SET_DISCARD_ILSEQ
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Sets whether illegal sequences are discarded or not.
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.Fa argument ,
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which is of
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.Ft int *
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set to 1 or disables it if
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.Fa argument
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is set to 0.
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.It ICONV_SET_HOOKS
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Sets callback functions, which will be called back after successful
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conversions.
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The callback functions are stored in a
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.Ft struct iconv_hooks
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variable, which is passed to
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.Nm
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via
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.Fa argument
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by its address.
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.It ICONV_GET_ILSEQ_INVALID
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Determines if a character in the input buffer that is valid,
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but for which an identical character does not exist in the target
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codeset returns
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.Er EILSEQ
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or not.
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The answer is stored in
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.Fa argument ,
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which is of
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.Ft int * .
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It will be set to 1 if this feature is enabled or set to 0 otherwise.
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.It ICONV_SET_ILSEQ_INVALID
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Sets whether a character in the input buffer that is valid,
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but for which an identical character does not exist in the target
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codeset returns
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.Er EILSEQ
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or not.
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If
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.Fa argument ,
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which is of
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.Ft int *
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is set to 1 it will be enabled,
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and if
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.Fa argument
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is set to 0 it will be disabled.
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.El
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.\" XXX: fallbacks are unimplemented and trying to set them will always
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.\" return EOPNOTSUPP but definitions are provided for source-level
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.\" compatibility.
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.\".It ICONV_SET_FALLBACKS
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.\"Sets callback functions, which will be called back after failed
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.\"conversions.
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.\"The callback functions are stored in a
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.\".Ft struct iconv_fallbacks
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.\"variable, which is passed to
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.\".Nm
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.\"via
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.\".Fa argument
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.\"by its address.
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.Sh RETURN VALUES
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Upon successful completion
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.Fn iconvctl ,
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returns 0.
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Otherwise, \-1 is returned and errno is set to
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specify the kind of error.
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.Sh ERRORS
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The
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.Fn iconvctl
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function may cause an error in the following cases:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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Unknown or unimplemented operation.
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.It Bq Er EBADF
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The conversion descriptor specified by
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.Fa cd
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is invalid.
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.El
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.Sh SEE ALSO
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.Xr iconv 1 ,
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.Xr iconv 3
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.Sh STANDARDS
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The
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.Nm
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facility is a non-standard extension, which appeared in
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the GNU implementation and was adopted in
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.Fx 9
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for compatibility's sake.
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.Sh AUTHORS
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This manual page was written by
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.An Gabor Kovesdan Aq gabor@FreeBSD.org .
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.Sh BUGS
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Transliteration is enabled in this implementation by default, so it
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is impossible by design to turn it off.
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Accordingly, trying to turn it off will always fail and \-1 will be
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returned.
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Getting the transliteration state will always succeed and indicate
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that it is turned on, though.
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