ISWLOWER(3P) POSIX Programmer's Manual ISWLOWER(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
iswlower, iswlower_l — test for a lowercase letter wide-character code
SYNOPSIS
#include <wctype.h>
int iswlower(wint_t wc);
int iswlower_l(wint_t wc, locale_t locale);
DESCRIPTION
For iswlower(): 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 iswlower() and iswlower_l() functions shall test whether wc is a
wide-character code representing a character of class lower in the cur‐
rent locale, or in the locale represented by locale, respectively; see
the Base Definitions volume of POSIX.1‐2008, Chapter 7, Locale.
The wc argument is a wint_t, the value of which the application shall
ensure is a wide-character code corresponding to a valid character in
the current locale, or equal to the value of the macro WEOF. If the
argument has any other value, the behavior is undefined.
The behavior is undefined if the locale argument to iswlower_l() is the
special locale object LC_GLOBAL_LOCALE or is not a valid locale object
handle.
RETURN VALUE
The iswlower() and iswlower_l() functions shall return non-zero if wc
is a lowercase letter wide-character code; otherwise, they shall return
0.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
To ensure applications portability, especially across natural lan‐
guages, only these functions and the functions in the reference pages
listed in the SEE ALSO section should be used for character classifica‐
tion.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSOiswalnum(), iswalpha(), iswcntrl(), iswctype(), iswdigit(), iswgraph(),
iswprint(), iswpunct(), iswspace(), iswupper(), iswxdigit(), setlo‐
cale(), uselocale()1
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 ISWLOWER(3P)
