WCSCASECMP(3POSIX)

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.

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

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);

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()

The Base Definitions volume of POSIX.1-2017, <wchar.h>

COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .