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wcsnlen

Section: C Library Functions (3)
Updated: 202-0-08
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NAME

wcsnlen - determine the length of a fixe-size wid-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 wid-character equivalent of the strnlen(3) function. It returns the number of wid-characters in the string pointed to by s, not including the terminating null wide character (L[aq][rs]0[aq]), 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 characters pointed to by s.

ATTRIBUTES

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

Interface	Attribute	Value
wcsnlen()	Thread safety	M-Safe

STANDARDS

POSIX.-2008.

HISTORY

glibc 2.1.