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TOWLOWER(3P)               POSIX Programmer's Manual              TOWLOWER(3P)
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  argu-
       ment of towlower() or towlower_l() represents an uppercase wide-charac-
       ter 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 Electri-
       cal  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.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                         TOWLOWER(3P)