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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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mbstate_t(3type) mbstate_t(3type)
mbstate_t - multi-byte-character conversion state
Standard C library (libc)
#include <wchar.h>
typedef /* ... */ mbstate_t;
Character conversion between the multibyte representation and the
wide character representation uses conversion state, of type
mbstate_t. Conversion of a string uses a finite-state machine;
when it is interrupted after the complete conversion of a number
of characters, it may need to save a state for processing the
remaining characters. Such a conversion state is needed for the
sake of encodings such as ISO/IEC 2022 and UTF-7.
The initial state is the state at the beginning of conversion of
a string. There are two kinds of state: the one used by
multibyte to wide character conversion functions, such as
mbsrtowcs(3), and the one used by wide character to multibyte
conversion functions, such as wcsrtombs(3), but they both fit in
a mbstate_t, and they both have the same representation for an
initial state.
For 8-bit encodings, all states are equivalent to the initial
state. For multibyte encodings like UTF-8, EUC-*, BIG5, or SJIS,
the wide character to multibyte conversion functions never
produce non-initial states, but the multibyte to wide-character
conversion functions like mbrtowc(3) do produce non-initial
states when interrupted in the middle of a character.
One possible way to create an mbstate_t in initial state is to
set it to zero:
mbstate_t state;
memset(&state, 0, sizeof(state));
On Linux, the following works as well, but might generate
compiler warnings:
mbstate_t state = { 0 };
C11, POSIX.1-2008.
C99, POSIX.1-2001.
mbrlen(3), mbrtowc(3), mbsinit(3), mbsrtowcs(3), wcrtomb(3),
wcsrtombs(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-6.9.1.tar.gz
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⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
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improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.9.1 2024-05-03 mbstate_t(3type)
Pages that refer to this page: mbsinit(3)
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HTML rendering created 2024-06-26 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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