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

       towlower, towlower_l — transliterate uppercase wide-character code to lowercase

SYNOPSIS

       #include <wctype.h>

       wint_t towlower(wint_t wc);
       wint_t towlower_l(wint_t wc, locale_t locale);

DESCRIPTION

       For  towlower():  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  towlower()  and  towlower_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 towlower()  or  towlower_l()
       represents  an  uppercase  wide-character code, and there exists a corresponding lowercase 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 lowercase wide-character
       code.  All other arguments in the domain are returned unchanged.

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

RETURN VALUE

       Upon  successful  completion, the towlower() and towlower_l() functions shall return the lowercase 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 .