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 ALSOsetlocale(), 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)
