This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       None.

       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(3POSIX)

       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.

       No errors are defined.

       Thefollowingsectionsareinformative.

       None.

       None.

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

       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.

       None.

       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.

strcasecmp(), wcscmp(), wcsncmp()

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

       #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);