The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### NAME

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

#### SYNOPSIS

> ``#include <wchar.h>
> size_t wcslen(const wchar_t *`ws`);
> ``

> ``[CX] size_t wcsnlen(const wchar_t *`ws`, size_t` maxlen`);``
> `
> `

#### DESCRIPTION

> For wcslen(): [CX] 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.1-2008 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.

> [CX] 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.

> [CX] 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

> XBD <wchar.h>

#### CHANGE HISTORY

> First released in Issue 4. Derived from the MSE working draft.

#### Issue 7

> The wcsnlen() function is added from The Open Group Technical Standard, 2006, Extended API Set Part 1.

> POSIX.1-2008, Technical Corrigendum 2, XSH/TC2-2008/0390 [560] is applied.

End of informative text.

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