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man:wcsnlen

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 charac-
     ter (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)

COLOPHON

     This  page  is  part of release 4.16 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/.

GNU 2016-03-15 WCSNLEN(3)

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