NAME

       wcsnlen - determine the length of a fixed-size wide-character string

SYNOPSIS

       #include <wchar.h>

       size_t wcsnlen(const wchar_t *s, size_t maxlen);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       wcsnlen():
           Since glibc 2.10:
               _POSIX_C_SOURCE >= 200809L
           Before glibc 2.10:
               _GNU_SOURCE

DESCRIPTION

       The  wcsnlen()  function  is the wide-character equivalent of the strnlen(3) function.  It
       returns the number of wide-characters in the string pointed to by  s,  not  including  the
       terminating  null  wide  character (L'\0'), but at most maxlen wide characters (note: this
       parameter is not a byte count).  In doing this, wcsnlen() looks at only the  first  maxlen
       wide characters at s and never beyond s+maxlen.

RETURN VALUE

       The  wcsnlen() function returns wcslen(s), if that is less than maxlen, or maxlen if there
       is no null wide character among the first maxlen wide characters pointed to by s.

VERSIONS

       The wcsnlen() function is provided in glibc since version 2.1.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       ┌───────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │Interface                                                      │ Attribute     │ Value   │
       ├───────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │wcsnlen()                                                      │ Thread safety │ MT-Safe │
       └───────────────────────────────────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO

       POSIX.1-2008.

SEE ALSO

       strnlen(3), wcslen(3)

COLOPHON

       This page is part of release 5.13 of the Linux man-pages project.  A  description  of  the
       project,  information  about  reporting  bugs, and the latest version of this page, can be
       found at https://www.kernel.org/doc/man-pages/.