WCSNLEN(3)                                                              Linux Programmer's Manual                                                             WCSNLEN(3)

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

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.

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.

VERSIONS
       The wcsnlen() function is provided in glibc since version 2.1.

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

       ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │Interface                                                                                                                             │ Attribute     │ Value   │
       ├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │wcsnlen()                                                                                                                             │ Thread safety │ MT-Safe │
       └──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO
       POSIX.1-2008.

SEE ALSO
       strnlen(3), wcslen(3)

GNU                                                                            2021-03-22                                                                     WCSNLEN(3)