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

       towupper, towupper_l — transliterate lowercase wide-character code to uppercase

SYNOPSIS

       #include <wctype.h>

       wint_t towupper(wint_t wc);
       wint_t towupper_l(wint_t wc, locale_t locale);

DESCRIPTION

       For  towupper():  The  functionality described on this reference page is aligned with the ISO C standard.
       Any conflict between the requirements described here and the ISO C standard is unintentional. This volume
       of POSIX.1‐2017 defers to the ISO C standard.

       The towupper() and towupper_l() functions have as a  domain  a  type  wint_t,  the  value  of  which  the
       application  shall  ensure  is  a  character  representable  as  a  wchar_t,  and  a  wide-character code
       corresponding to a valid character in the locale used by the function or  the  value  of  WEOF.   If  the
       argument  has  any other value, the behavior is undefined.  If the argument of towupper() or towupper_l()
       represents a lowercase wide-character code, and there exists  a  corresponding  uppercase  wide-character
       code  as  defined  by  character  type  information in the current locale or in the locale represented by
       locale, respectively (category LC_CTYPE), the result shall be the corresponding uppercase  wide-character
       code.  All other arguments in the domain are returned unchanged.

       The  behavior  is  undefined  if  the  locale  argument  to  towupper_l()  is  the  special locale object
       LC_GLOBAL_LOCALE or is not a valid locale object handle.

RETURN VALUE

       Upon successful completion, the towupper() and towupper_l() functions shall return the  uppercase  letter
       corresponding to the argument passed. Otherwise, they shall return the argument unchanged.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       setlocale(), uselocale()

       The Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale, <locale.h>, <wctype.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                                      TOWUPPER(3POSIX)