libc: proper FreeBSD version and some Mt macros for mails
[dragonfly.git] / lib / libc / iconv / iconvctl.3
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1.\" Copyright (c) 2009 Gabor Kovesdan <gabor@FreeBSD.org>
2.\" All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\" notice, this list of conditions and the following disclaimer.
9.\" 2. Redistributions in binary form must reproduce the above copyright
10.\" notice, this list of conditions and the following disclaimer in the
11.\" documentation and/or other materials provided with the distribution.
12.\"
13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23.\" SUCH DAMAGE.
24.\"
25.\" Portions of this text are reprinted and reproduced in electronic form
26.\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
27.\" Portable Operating System Interface (POSIX), The Open Group Base
28.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
29.\" Electrical and Electronics Engineers, Inc and The Open Group. In the
30.\" event of any discrepancy between this version and the original IEEE and
31.\" The Open Group Standard, the original IEEE and The Open Group Standard is
32.\" the referee document. The original Standard can be obtained online at
33.\" http://www.opengroup.org/unix/online.html.
34.\"
35.\" $FreeBSD: head/lib/libc/iconv/iconvctl.3 233577 2012-03-27 20:50:14Z joel $
36.\"
37.Dd September 19, 2013
38.Dt ICONVCTL 3
39.Os
40.Sh NAME
41.Nm iconvctl
42.Nd controlling and diagnostical facility for
43.Xr iconv 3
44.Sh LIBRARY
45.Lb libc
46.Sh SYNOPSIS
47.In iconv.h
48.Ft int
49.Fn iconvctl "iconv_t cd" "int request" "void *argument"
50.Sh DESCRIPTION
51The
52.Fn iconvctl
53function can retrieve or set specific conversion
54setting from the
55.Fa cd
56conversion descriptor.
57The
58.Fa request
59parameter specifies the operation to accomplish and
60.Fa argument
61is an operation-specific argument.
62.Pp
63The possible operations are the following:
64.Bl -tag -width indent
65.It ICONV_TRIVIALP
66In this case
67.Fa argument
68is an
69.Ft int *
70variable, which is set to 1 if the encoding is trivial one, i.e.
71the input and output encodings are the same.
72Otherwise, the variable will be 0.
73.It ICONV_GET_TRANSLITERATE
74Determines if transliteration is enabled.
75The answer is stored in
76.Fa argument ,
77which is of
78.Ft int * .
79It will be set to 1 if this feature is enabled or set to 0 otherwise.
80.It ICONV_SET_TRANSLITERATE
81Enables transliteration if
82.Fa argument ,
83which is of
84.Ft int *
85set to 1 or disables it if
86.Fa argument
87is set to 0.
88.It ICONV_GET_DISCARD_ILSEQ
89Determines if illegal sequences are discarded or not.
90The answer is stored in
91.Fa argument ,
92which is of
93.Ft int * .
94It will be set to 1 if this feature is enabled or set to 0 otherwise.
95.It ICONV_SET_DISCARD_ILSEQ
96Sets whether illegal sequences are discarded or not.
97.Fa argument ,
98which is of
99.Ft int *
100set to 1 or disables it if
101.Fa argument
102is set to 0.
103.It ICONV_SET_HOOKS
104Sets callback functions, which will be called back after successful
105conversions.
106The callback functions are stored in a
107.Ft struct iconv_hooks
108variable, which is passed to
109.Nm
110via
111.Fa argument
112by its address.
113.El
114.\" XXX: fallbacks are unimplemented and trying to set them will always
115.\" return EOPNOTSUPP but definitions are provided for source-level
116.\" compatibility.
117.\".It ICONV_SET_FALLBACKS
118.\"Sets callback functions, which will be called back after failed
119.\"conversions.
120.\"The callback functions are stored in a
121.\".Ft struct iconv_fallbacks
122.\"variable, which is passed to
123.\".Nm
124.\"via
125.\".Fa argument
126.\"by its address.
127.Sh RETURN VALUES
128Upon successful completion
129.Fn iconvctl ,
130returns 0.
131Otherwise, \-1 is returned and errno is set to
132specify the kind of error.
133.Sh ERRORS
134The
135.Fn iconvctl
136function may cause an error in the following cases:
137.Bl -tag -width Er
138.It Bq Er EINVAL
139Unknown or unimplemented operation.
140.It Bq Er EBADF
141The conversion descriptor specified by
142.Fa cd
143is invalid.
144.El
145.Sh SEE ALSO
146.Xr iconv 1 ,
147.Xr iconv 3
148.Sh STANDARDS
149The
150.Nm
151facility is a non-standard extension, which appeared in
152the GNU implementation and was adopted in
d118ff3c 153.Fx 9.0
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154for compatibility's sake.
155.Sh AUTHORS
156This manual page was written by
d118ff3c 157.An Gabor Kovesdan Aq Mt gabor@FreeBSD.org .
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158.Sh BUGS
159Transliteration is enabled in this implementation by default, so it
160is impossible by design to turn it off.
161Accordingly, trying to turn it off will always fail and \-1 will be
162returned.
163Getting the transliteration state will always succeed and indicate
164that it is turned on, though.