PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult the corresponding Linux  manual  page  for  details  of
       Linux behavior), or the interface may not be implemented on Linux.

NAME

       wcslen, wcsnlen — get length of a fixed-sized wide-character string

SYNOPSIS

       #include <wchar.h>

       size_t wcslen(const wchar_t *ws);
       size_t wcsnlen(const wchar_t *ws, size_t maxlen);

DESCRIPTION

       For wcslen(): The functionality described on this reference page is aligned with the ISO C
       standard. Any conflict between the requirements described here and the ISO C  standard  is
       unintentional. This volume of POSIX.1‐2017 defers to the ISO C standard.

       The  wcslen()  function  shall  compute  the  number  of wide-character codes in the wide-
       character string to which ws points, not including  the  terminating  null  wide-character
       code.

       The  wcsnlen()  function shall compute the smaller of the number of wide characters in the
       array to which ws points, not including any terminating null wide-character code, and  the
       value  of  maxlen.   The wcsnlen() function shall never examine more than the first maxlen
       characters of the wide-character array pointed to by ws.

RETURN VALUE

       The wcslen() function shall return the length of ws.

       The wcsnlen() function shall return the number of wide characters preceding the first null
       wide-character  code in the array to which ws points, if ws contains a null wide-character
       code within the first maxlen wide characters; otherwise, it shall return maxlen.

       No return values are reserved to indicate an error.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       strlen()

       The Base Definitions volume of POSIX.1‐2017, <wchar.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1-2017,  Standard  for  Information Technology -- Portable Operating System Interface
       (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C)  2018  by
       the  Institute  of  Electrical  and Electronics Engineers, Inc and The Open Group.  In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard,  the  original  IEEE  and  The  Open Group Standard is the referee document. The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page are most  likely  to  have
       been  introduced  during  the conversion of the source files to man page format. To report
       such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .