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Linux 2.6 - man page for wcsnlen (linux section 3)

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:
	       _XOPEN_SOURCE >= 700 || _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
   Multithreading (see pthreads(7))
       The wcsnlen() function is thread-safe.

CONFORMING TO
       POSIX.1-2008.

SEE ALSO
       strnlen(3), wcslen(3)

COLOPHON
       This page is part of release 3.55 of the Linux man-pages project.  A  description  of  the
       project,     and    information	  about    reporting	bugs,	 can	be    found    at
       http://www.kernel.org/doc/man-pages/.

GNU					    2013-11-25				       WCSNLEN(3)


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