wcsnlen(3) [xfree86 man page]

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''), 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 4.15 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)

WCSLEN(3P)						     POSIX Programmer's Manual							WCSLEN(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

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

SYNOPSIS

       #include <wchar.h>

       size_t wcslen(const wchar_t *ws);
       size_t wcsnlen(const wchar_t *ws, size_t maxlen);

DESCRIPTION

       For wcslen(): 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.

       The wcsnlen() function shall compute the smaller of the number of wide characters in the string to which ws points, not including the  ter-
       minating  null wide-character code, and the value of maxlen.  The wcsnlen() function shall never examine more than the first maxlen charac-
       ters of the wide-character string pointed to by ws.

RETURN VALUE

       The wcslen() function shall return the length of ws.

       The wcsnlen() function shall return an integer containing the smaller of either the length of the wide-character string pointed to by ws or
       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()

       The Base Definitions volume of POSIX.1-2008, <wchar.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C)  2013  by	the  Institute	of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
       event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE
/The Open Group						       2013								WCSLEN(3P)