iswupper - test for an uppercase letter wide-character code
int iswupper(wint_t wc);
The iswupper() function shall test whether wc is a wide-character code
representing a character of class upper in the program's current
locale; see the Base Definitions volume of IEEE Std 1003.1-2001,
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 iswupper() function shall return non-zero if wc is an uppercase
letter wide-character code; otherwise, it shall return 0.
No errors are defined.
The following sections are informative.
To ensure applications portability, especially across natural
languages, only this function and those listed in the SEE ALSO section
should be used for classification of wide-character codes.
iswalnum() , iswalpha() , iswcntrl() , iswctype() , iswdigit() ,
iswgraph() , iswlower() , iswprint() , iswpunct() , iswspace() ,
iswxdigit() , setlocale() , the Base Definitions volume of
IEEE Std 1003.1-2001, Chapter 7, Locale, <wchar.h>, <wctype.h>
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 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.php .