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.1‐2008 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 current locale 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.1‐2008, Chapter 7, Locale, <locale.h>, <wctype.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition,
       Standard  for  Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electrical and Electronics Engineers,  Inc
       and  The  Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/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                                   2013                                      TOWLOWER(3POSIX)