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.1-2017 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
       current locale, or in the locale represented by locale, respectively;
       see the Base Definitions volume of POSIX.1-2017, 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 locale used by the function, 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
       languages, only these functions and the functions in the reference
       pages listed in the SEE ALSO section should be used for character
       classification.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       iswalnum(), iswalpha(), iswcntrl(), iswctype(), iswdigit(), iswgraph(),
       iswprint(), iswpunct(), iswspace(), iswupper(), iswxdigit(),
       setlocale(), uselocale()1

       The Base Definitions volume of POSIX.1-2017, Chapter 7, Locale,
       <locale.h>, <wctype.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  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.opengroup.org/unix/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                  2017                         ISWLOWER(3P)