posix man page for towlower

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 correspond-
       ing 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  require-
       ments 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-char-
       acter 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 Technol-
       ogy  --	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 Stan-
       dard 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(3P)