mbrlen(3) - Linux manual page (original) (raw)

mbrlen(3) Library Functions Manual mbrlen(3)

NAME top

   mbrlen - determine number of bytes in next multibyte character

LIBRARY top

   Standard C library (_libc_, _-lc_)

SYNOPSIS top

   **#include <wchar.h>**

   **size_t mbrlen(const char** _s_**[restrict .**_n_**], size_t** _n_**,**
                 **mbstate_t *restrict** _ps_**);**

DESCRIPTION top

   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 _(sizet) -2_.  This can happen even if
   _n_ >= _MBCURMAX_, 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 _(sizet) -1_ and sets _[errno](../man3/errno.3.html)_ 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.

RETURN VALUE top

   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 _(sizet) -1_ and sets _[errno](../man3/errno.3.html)_ to **EILSEQ**, if
   an invalid multibyte sequence was encountered.  It returns
   _(sizet) -2_ if it couldn't parse a complete multibyte character,
   meaning that _n_ should be increased.

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌────────────────────┬───────────────┬───────────────────────────┐
   │ **Interface** │ **Attribute** │ **Value** │
   ├────────────────────┼───────────────┼───────────────────────────┤
   │ **mbrlen**()           │ Thread safety │ MT-Unsafe race:mbrlen/!ps │
   └────────────────────┴───────────────┴───────────────────────────┘

STANDARDS top

   C11, POSIX.1-2008.

HISTORY top

   POSIX.1-2001, C99.

NOTES top

   The behavior of **mbrlen**() depends on the **LC_CTYPE** category of the
   current locale.

SEE ALSO top

   [mbrtowc(3)](../man3/mbrtowc.3.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 mbrlen(3)

Pages that refer to this page:mblen(3), mbsinit(3), mbstate_t(3type)