1 .\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
3 .\" This is free documentation; you can redistribute it and/or
4 .\" modify it under the terms of the GNU General Public License as
5 .\" published by the Free Software Foundation; either version 2 of
6 .\" the License, or (at your option) any later version.
8 .\" References consulted:
9 .\" GNU glibc-2 source code and manual
10 .\" OpenGroup's Single Unix specification http://www.UNIX-systems.org/online.html
12 .TH ICONV_OPEN 3 "December 6, 2001" "GNU" "Linux Programmer's Manual"
14 iconv_open \- allocate descriptor for character set conversion
19 .BI "iconv_t iconv_open (const char* " tocode ", const char* " fromcode );
22 The \fBiconv_open\fP function allocates a conversion descriptor suitable
23 for converting byte sequences from character encoding \fIfromcode\fP to
24 character encoding \fItocode\fP.
26 The values permitted for \fIfromcode\fP and \fItocode\fP and the supported
27 combinations are system dependent. For the libiconv library, the following
28 encodings are supported, in all combinations.
31 ASCII, ISO-8859-{1,2,3,4,5,7,9,10,13,14,15,16},
32 KOI8-R, KOI8-U, KOI8-RU,
33 CP{1250,1251,1252,1253,1254,1257}, CP{850,866},
34 Mac{Roman,CentralEurope,Iceland,Croatian,Romania},
35 Mac{Cyrillic,Ukraine,Greek,Turkish},
39 ISO-8859-{6,8}, CP{1255,1256}, CP862, Mac{Hebrew,Arabic}
42 EUC-JP, SHIFT-JIS, CP932, ISO-2022-JP, ISO-2022-JP-2, ISO-2022-JP-1
45 EUC-CN, HZ, GBK, GB18030, EUC-TW, BIG5, CP950, BIG5-HKSCS,
46 ISO-2022-CN, ISO-2022-CN-EXT
49 EUC-KR, CP949, ISO-2022-KR, JOHAB
55 Georgian-Academy, Georgian-PS
58 TIS-620, CP874, MacThai
72 UCS-2, UCS-2BE, UCS-2LE
73 UCS-4, UCS-4BE, UCS-4LE
74 UTF-16, UTF-16BE, UTF-16LE
75 UTF-32, UTF-32BE, UTF-32LE
80 Full Unicode, in terms of \fBuint16_t\fP or \fBuint32_t\fP
81 (with machine dependent endianness and alignment)
83 UCS-2-INTERNAL, UCS-4-INTERNAL
86 Locale dependent, in terms of \fBchar\fP or \fBwchar_t\fP
87 (with machine dependent endianness and alignment, and with semantics
88 depending on the OS and the current LC_CTYPE locale facet)
92 The empty encoding name "" is equivalent to "char": it denotes the
93 locale dependent character encoding.
95 When the string "//TRANSLIT" is appended to \fItocode\fP, transliteration
96 is activated. This means that when a character cannot be represented in the
97 target character set, it can be approximated through one or several
98 similarly looking characters.
100 The resulting conversion descriptor can be used with \fBiconv\fP any number
101 of times. It remains valid until deallocated using \fBiconv_close\fP.
103 A conversion descriptor contains a conversion state. After creation using
104 \fBiconv_open\fP, the state is in the initial state. Using \fBiconv\fP
105 modifies the descriptor's conversion state. (This implies that a conversion
106 descriptor can not be used in multiple threads simultaneously.) To bring the
107 state back to the initial state, use \fBiconv\fP with NULL as \fIinbuf\fP
110 The \fBiconv_open\fP function returns a freshly allocated conversion
111 descriptor. In case of error, it sets \fBerrno\fP and returns (iconv_t)(-1).
113 The following error can occur, among others:
116 The conversion from \fIfromcode\fP to \fItocode\fP is not supported by the
121 .BR iconv "(3), " iconv_close (3)