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 .