php man page for wcsnlen

WCSNLEN(3)						     Linux Programmer's Manual							WCSNLEN(3)

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''), 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 4.15 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/.

GNU
								    2016-03-15								WCSNLEN(3)