wcsnlen(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | VERSIONS | ATTRIBUTES | CONFORMING TO | SEE ALSO | COLOPHON

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

NAME         top

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

SYNOPSIS         top

       #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         top

       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         top

       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         top

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

ATTRIBUTES         top

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

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

CONFORMING TO         top

       POSIX.1-2008.

SEE ALSO         top

       strnlen(3), wcslen(3)

COLOPHON         top

       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/.

GNU                            2021-03-22                     WCSNLEN(3)

Pages that refer to this page: strlen(3)wcslen(3)signal-safety(7)