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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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mbrlen(3) Library Functions Manual mbrlen(3)
mbrlen - determine number of bytes in next multibyte character
Standard C library (libc, -lc)
#include <wchar.h>
size_t mbrlen(size_t n;
const char s[restrict n], size_t n,
mbstate_t *restrict ps);
The mbrlen() function inspects at most n bytes of the multibyte
string starting at s and extracts the next complete multibyte
character. It updates the shift state *ps. 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 resets the shift state *ps to the
initial state and returns 0.
If the n bytes starting at s do not contain a complete multibyte
character, mbrlen() returns (size_t) -2. This can happen even if
n >= 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, mbrlen()
returns (size_t) -1 and sets errno to EILSEQ. In this case, the
effects on *ps are undefined.
If ps is NULL, a static anonymous state known only to the mbrlen()
function is used instead.
The mbrlen() 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 (size_t) -1 and sets errno to EILSEQ, if
an invalid multibyte sequence was encountered. It returns
(size_t) -2 if it couldn't parse a complete multibyte character,
meaning that n should be increased.
For an explanation of the terms used in this section, see
attributes(7).
┌────────────────────┬───────────────┬───────────────────────────┐
│ Interface │ Attribute │ Value │
├────────────────────┼───────────────┼───────────────────────────┤
│ mbrlen() │ Thread safety │ MT-Unsafe race:mbrlen/!ps │
└────────────────────┴───────────────┴───────────────────────────┘
C11, POSIX.1-2008.
POSIX.1-2001, C99.
The behavior of mbrlen() depends on the LC_CTYPE category of the
current locale.
mbrtowc(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⟩.
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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-
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Linux man-pages 6.15 2025-06-28 mbrlen(3)
Pages that refer to this page: mblen(3), mbsinit(3), mbstate_t(3type)
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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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