wcslen - Man Page

determine the length of a wide-character string


#include <wchar.h>

size_t wcslen(const wchar_t *s);


The wcslen() function is the wide-character equivalent of the strlen(3) function. It determines the length of the wide-character string pointed to by s, excluding the terminating null wide character (L'\0').

Return Value

The wcslen() function returns the number of wide characters in s.


For an explanation of the terms used in this section, see attributes(7).

wcslen()Thread safetyMT-Safe

Conforming to

POSIX.1-2001, POSIX.1-2008, C99.


In cases where the input buffer may not contain a terminating null wide character, wcsnlen(3) should be used instead.

See Also



This page is part of release 5.13 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/.

Referenced By

signal-safety(7), strlen(3), wcsnlen(3).

2021-08-27 GNU Linux Programmer's Manual