WCSCASECMP(3)              POSIX Programmer's Manual             WCSCASECMP(3)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

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 .



IEEE/The Open Group                  2017                        WCSCASECMP(3)
