wcsnlen - determine the length of a fixed-size wide-character string
#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
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.
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.
The
wcsnlen() function is provided in glibc since version 2.1.
For an explanation of the terms used in this section, see
attributes(7).
| Interface |
Attribute |
Value |
| wcsnlen () |
Thread safety |
MT-Safe |
POSIX.1-2008.
strnlen(3),
wcslen(3)