нечувствительное сравнение строк широких символов (insensitive wide-character string comparison)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
wcscasecmp, wcscasecmp_l, wcsncasecmp, wcsncasecmp_l — case-
insensitive wide-character string comparison
Синопсис (Synopsis)
#include <wchar.h>
int wcscasecmp(const wchar_t *ws1, const wchar_t *ws2);
int wcscasecmp_l(const wchar_t *ws1, const wchar_t *ws2,
locale_t locale);
int wcsncasecmp(const wchar_t *ws1, const wchar_t *ws2, size_t n);
int wcsncasecmp_l(const wchar_t *ws1, const wchar_t *ws2,
size_t n, locale_t locale);
Описание (Description)
The wcscasecmp() and wcsncasecmp() functions are the wide-
character equivalent of the strcasecmp() and strncasecmp()
functions, respectively.
The wcscasecmp() and wcscasecmp_l() functions shall compare,
while ignoring differences in case, the wide-character string
pointed to by ws1 to the wide-character string pointed to by ws2.
The wcsncasecmp() and wcsncasecmp_l() functions shall compare,
while ignoring differences in case, not more than n wide-
characters from the wide-character string pointed to by ws1 to
the wide-character string pointed to by ws2.
The wcscasecmp() and wcsncasecmp() functions use the current
locale to determine the case of the wide characters.
The wcscasecmp_l() and wcsncasecmp_l() functions use the locale
represented by locale to determine the case of the wide
characters.
When the LC_CTYPE category of the locale being used is from the
POSIX locale, these functions shall behave as if the wide-
character strings had been converted to lowercase and then a
comparison of wide-character codes performed. Otherwise, the
results are unspecified.
The information for wcscasecmp_l() and wcsncasecmp_l() about the
case of the characters comes from the locale represented by
locale.
The behavior is undefined if the locale argument to
wcscasecmp_l() or wcsncasecmp_l() is the special locale object
LC_GLOBAL_LOCALE or is not a valid locale object handle.
Возвращаемое значение (Return value)
Upon completion, the wcscasecmp() and wcscasecmp_l() functions
shall return an integer greater than, equal to, or less than 0 if
the wide-character string pointed to by ws1 is, ignoring case,
greater than, equal to, or less than the wide-character string
pointed to by ws2, respectively.
Upon completion, the wcsncasecmp() and wcsncasecmp_l() functions
shall return an integer greater than, equal to, or less than 0 if
the possibly null wide-character terminated string pointed to by
ws1 is, ignoring case, greater than, equal to, or less than the
possibly null wide-character terminated string pointed to by ws2,
respectively.
No return values are reserved to indicate an error.
Ошибки (Error)
No errors are defined.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
strcasecmp(3p), wcscmp(3p), wcsncmp(3p)
The Base Definitions volume of POSIX.1‐2017, wchar.h(0p)
