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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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iconv_open(3) Library Functions Manual iconv_open(3)
iconv_open - allocate descriptor for character set conversion
Standard C library (libc, -lc)
#include <iconv.h>
iconv_t iconv_open(const char *tocode, const char *fromcode);
The iconv_open() function allocates a conversion descriptor
suitable for converting byte sequences from character encoding
fromcode to character encoding tocode.
The values permitted for fromcode and tocode and the supported
combinations are system-dependent. For the GNU C library, the
permitted values are listed by the iconv --list command, and all
combinations of the listed values are supported. Furthermore the
GNU C library and the GNU libiconv library support the following
two suffixes:
//TRANSLIT
When the string "//TRANSLIT" is appended to tocode,
transliteration is activated. This means that when a
character cannot be represented in the target character
set, it can be approximated through one or several
similarly looking characters.
//IGNORE
When the string "//IGNORE" is appended to tocode,
characters that cannot be represented in the target
character set will be silently discarded.
The resulting conversion descriptor can be used with iconv(3) any
number of times. It remains valid until deallocated using
iconv_close(3).
A conversion descriptor contains a conversion state. After
creation using iconv_open(), the state is in the initial state.
Using iconv(3) modifies the descriptor's conversion state. To
bring the state back to the initial state, use iconv(3) with NULL
as inbuf argument.
On success, iconv_open() returns a freshly allocated conversion
descriptor. On failure, it returns (iconv_t) -1 and sets errno to
indicate the error.
The following error can occur, among others:
EINVAL The conversion from fromcode to tocode is not supported by
the implementation.
For an explanation of the terms used in this section, see
attributes(7).
┌───────────────────────────────┬───────────────┬────────────────┐
│ Interface │ Attribute │ Value │
├───────────────────────────────┼───────────────┼────────────────┤
│ iconv_open() │ Thread safety │ MT-Safe locale │
└───────────────────────────────┴───────────────┴────────────────┘
POSIX.1-2008.
glibc 2.1. POSIX.1-2001, SUSv2.
iconv(1), iconv(3), iconv_close(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.15 2025-05-17 iconv_open(3)
Pages that refer to this page: iconv(1), bind_textdomain_codeset(3), iconv(3), iconv_close(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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