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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | VERSIONS | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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wctomb(3) Library Functions Manual wctomb(3)
wctomb - convert a wide character to a multibyte sequence
Standard C library (libc, -lc)
#include <stdlib.h>
int wctomb(char *s, wchar_t wc);
If s is not NULL, the wctomb() function converts the wide
character wc to its multibyte representation and stores it at the
beginning of the character array pointed to by s. It updates the
shift state, which is stored in a static anonymous variable known
only to the wctomb() function, and returns the length of said
multibyte representation, that is, the number of bytes written at
s.
At most MB_CUR_MAX bytes will be written at s. The programmer
must ensure that there is enough room to store the multibyte
sequence at s.
If s is NULL, the wctomb() function resets the shift state, known
only to this function, to the initial state, and returns nonzero
if the encoding has nontrivial shift state, or zero if the
encoding is stateless.
If s is not NULL, the wctomb() function returns the number of
bytes that have been written to the byte array at s. If wc can
not be represented as a multibyte sequence (according to the
current locale), -1 is returned.
If s is NULL, the wctomb() function returns nonzero if the
encoding has nontrivial shift state, or zero if the encoding is
stateless.
For an explanation of the terms used in this section, see
attributes(7).
┌───────────────────────────────┬───────────────┬────────────────┐
│ Interface │ Attribute │ Value │
├───────────────────────────────┼───────────────┼────────────────┤
│ wctomb() │ Thread safety │ MT-Unsafe race │
└───────────────────────────────┴───────────────┴────────────────┘
The function wcrtomb(3) provides a better interface to the same
functionality.
C11, POSIX.1-2008.
POSIX.1-2001, C99.
The behavior of wctomb() depends on the LC_CTYPE category of the
current locale.
MB_CUR_MAX(3), mblen(3), mbstowcs(3), mbtowc(3), wcrtomb(3),
wcstombs(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
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part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 wctomb(3)
Pages that refer to this page: MB_CUR_MAX(3), mbstowcs(3), mbtowc(3), wcstombs(3), wctob(3), locale(7), unicode(7)
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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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