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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
ISWUPPER(3) Linux Programmer's Manual ISWUPPER(3)
iswupper - test for uppercase wide character
#include <wctype.h>
int iswupper(wint_t wc);
The iswupper() function is the wide-character equivalent of the
isupper(3) function. It tests whether wc is a wide character
belonging to the wide-character class "upper".
The wide-character class "upper" is a subclass of the wide-character
class "alpha", and therefore also a subclass of the wide-character
class "alnum", of the wide-character class "graph" and of the wide-
character class "print".
Being a subclass of the wide-character class "print", the wide-
character class "upper" is disjoint from the wide-character class
"cntrl".
Being a subclass of the wide-character class "graph", the wide-
character class "upper" is disjoint from the wide-character class
"space" and its subclass "blank".
Being a subclass of the wide-character class "alnum", the wide-
character class "upper" is disjoint from the wide-character class
"punct".
Being a subclass of the wide-character class "alpha", the wide-
character class "upper" is disjoint from the wide-character class
"digit".
The wide-character class "upper" contains at least those characters
wc which are equal to towupper(wc) and different from towlower(wc).
The wide-character class "upper" always contains at least the letters
'A' to 'Z'.
The iswupper() function returns nonzero if wc is a wide character
belonging to the wide-character class "upper". Otherwise, it returns
zero.
For an explanation of the terms used in this section, see
attributes(7).
┌───────────┬───────────────┬────────────────┐
│Interface │ Attribute │ Value │
├───────────┼───────────────┼────────────────┤
│iswupper() │ Thread safety │ MT-Safe locale │
└───────────┴───────────────┴────────────────┘
POSIX.1-2001, POSIX.1-2008, C99.
The behavior of iswupper() depends on the LC_CTYPE category of the
current locale.
This function is not very appropriate for dealing with Unicode
characters, because Unicode knows about three cases: upper, lower and
title case.
isupper(3), iswctype(3), towupper(3)
This page is part of release 4.12 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
GNU 2015-08-08 ISWUPPER(3)
Pages that refer to this page: isalpha(3), iswctype(3), towupper(3)