wcsncasecmp - compare two fixed-size wide-character strings, ignoring case
#include <wchar.h>
int wcsncasecmp(const wchar_t *s1, const wchar_t *s2, size_t n);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
wcsncasecmp():
- Since glibc 2.10:
_POSIX_C_SOURCE >= 200809L
- Before glibc 2.10:
_GNU_SOURCE
The wcsncasecmp() function is the wide-character equivalent of the strncasecmp(3) function. It compares the wide-character string pointed to by s1
and the wide-character string pointed to by s2
, but at most n
wide characters from each string, ignoring case differences (towupper(3), towlower(3)).
The wcsncasecmp() function returns zero if the wide-character strings at s1
and s2
, truncated to at most length n
, are equal except for case distinctions. It returns a positive integer if truncated s1
is greater than truncated s2
, ignoring case. It returns a negative integer if truncated s1
is smaller than truncated s2
, ignoring case.
The wcsncasecmp() 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 |
wcsncasecmp() | Thread safety | MT-Safe locale |
POSIX.1-2008. This function is not specified in POSIX.1-2001, and is not widely available on other systems.
The behavior of wcsncasecmp() depends on the LC_CTYPE category of the current locale.
strncasecmp(3), wcsncmp(3)
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