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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | VERSIONS | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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mblen(3) Library Functions Manual mblen(3)
mblen - determine number of bytes in next multibyte character
Standard C library (libc, -lc)
#include <stdlib.h>
int mblen(size_t n;
const char s[n], size_t n);
If s is not NULL, the mblen() function inspects at most n bytes of
the multibyte string starting at s and extracts the next complete
multibyte character. It uses a static anonymous shift state known
only to the mblen() function. If the multibyte character is not
the null wide character, it returns the number of bytes that were
consumed from s. If the multibyte character is the null wide
character, it returns 0.
If the n bytes starting at s do not contain a complete multibyte
character, mblen() returns -1. This can happen even if n is
greater than or equal to MB_CUR_MAX, if the multibyte string
contains redundant shift sequences.
If the multibyte string starting at s contains an invalid
multibyte sequence before the next complete character, mblen()
also returns -1.
If s is NULL, the mblen() function resets the shift state, known
to only this function, to the initial state, and returns nonzero
if the encoding has nontrivial shift state, or zero if the
encoding is stateless.
The mblen() function returns the number of bytes parsed from the
multibyte sequence starting at s, if a non-null wide character was
recognized. It returns 0, if a null wide character was
recognized. It returns -1, if an invalid multibyte sequence was
encountered or if it couldn't parse a complete multibyte
character.
For an explanation of the terms used in this section, see
attributes(7).
┌───────────────────────────────┬───────────────┬────────────────┐
│ Interface │ Attribute │ Value │
├───────────────────────────────┼───────────────┼────────────────┤
│ mblen() │ Thread safety │ MT-Unsafe race │
└───────────────────────────────┴───────────────┴────────────────┘
The function mbrlen(3) provides a better interface to the same
functionality.
C11, POSIX.1-2008.
POSIX.1-2001, C99.
The behavior of mblen() depends on the LC_CTYPE category of the
current locale.
mbrlen(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 2025-06-28 mblen(3)
Pages that refer to this page: MB_CUR_MAX(3), mbstowcs(3), mbtowc(3), wcstombs(3), wctomb(3), locale(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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