wcsnlen(3)		    Library Functions Manual		      wcsnlen(3)

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

LIBRARY
     Standard C library (libc, -lc)

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-1].

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 char-
     acters pointed to by s.

ATTRIBUTES
     For an explanation of the terms used in this  section,  see  attributes(7).
     allbox; lbx lb lb l l l.  Interface Attribute Value T{ wcsnlen()
     T}	  Thread safety	  MT-Safe

STANDARDS
     POSIX.1-2008.

HISTORY
     glibc 2.1.

SEE ALSO
     strnlen(3), wcslen(3)

Linux man-pages 6.18		   2026-02-08			      wcsnlen(3)