The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### NAME

> wcscasecmp, wcscasecmp_l, wcsncasecmp, wcsncasecmp_l - case-insensitive wide-character string comparison

#### SYNOPSIS

> ``[CX] #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`);``
> `
> `

#### 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.

#### 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.

#### ERRORS

> No errors are defined.

The following sections are informative.

#### EXAMPLES

> None.

#### APPLICATION USAGE

> None.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> strcasecmp, wcscmp, wcsncmp

> XBD <wchar.h>

#### CHANGE HISTORY

> First released in Issue 7.

> POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0716 [294], XSH/TC1-2008/0717 [283], and XSH/TC1-2008/0718 [283] are applied.

End of informative text.

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