xref: /freebsd/lib/libc/iconv/iconvctl.3 (revision 3a92d97ff0f22d21608e1c19b83104c4937523b6)
1.\" Copyright (c) 2009 Gabor Kovesdan <gabor@FreeBSD.org>
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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
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32.\" the referee document.  The original Standard can be obtained online at
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34.\"
35.\" $FreeBSD$
36.\"
37.Dd November 25, 2009
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.It ICONV_GET_ILSEQ_INVALID
114Determines if a character in the input buffer that is valid,
115but for which an identical character does not exist in the target
116codeset returns
117.Er EILSEQ
118or not.
119The answer is stored in
120.Fa argument ,
121which is of
122.Ft int * .
123It will be set to 1 if this feature is enabled or set to 0 otherwise.
124.It ICONV_SET_ILSEQ_INVALID
125Sets whether a character in the input buffer that is valid,
126but for which an identical character does not exist in the target
127codeset returns
128.Er EILSEQ
129or not.
130If
131.Fa argument ,
132which is of
133.Ft int *
134is set to 1 it will be enabled,
135and if
136.Fa argument
137is set to 0 it will be disabled.
138.El
139.\" XXX: fallbacks are unimplemented and trying to set them will always
140.\"      return EOPNOTSUPP but definitions are provided for source-level
141.\"      compatibility.
142.\".It ICONV_SET_FALLBACKS
143.\"Sets callback functions, which will be called back after failed
144.\"conversions.
145.\"The callback functions are stored in a
146.\".Ft struct iconv_fallbacks
147.\"variable, which is passed to
148.\".Nm
149.\"via
150.\".Fa argument
151.\"by its address.
152.Sh RETURN VALUES
153Upon successful completion
154.Fn iconvctl ,
155returns 0.
156Otherwise, \-1 is returned and errno is set to
157specify the kind of error.
158.Sh ERRORS
159The
160.Fn iconvctl
161function may cause an error in the following cases:
162.Bl -tag -width Er
163.It Bq Er EINVAL
164Unknown or unimplemented operation.
165.It Bq Er EBADF
166The conversion descriptor specified by
167.Fa cd
168is invalid.
169.El
170.Sh SEE ALSO
171.Xr iconv 1 ,
172.Xr iconv 3
173.Sh STANDARDS
174The
175.Nm
176facility is a non-standard extension, which appeared in
177the GNU implementation and was adopted in
178.Fx 9.0
179for compatibility's sake.
180.Sh AUTHORS
181This manual page was written by
182.An Gabor Kovesdan Aq gabor@FreeBSD.org .
183.Sh BUGS
184Transliteration is enabled in this implementation by default, so it
185is impossible by design to turn it off.
186Accordingly, trying to turn it off will always fail and \-1 will be
187returned.
188Getting the transliteration state will always succeed and indicate
189that it is turned on, though.
190