ISWUPPER(3) Linux Programmer's Manual ISWUPPER(3)NAMEiswupper - test for uppercase wide character
SYNOPSIS
#include <wctype.h>
int iswupper(wint_t wc);
DESCRIPTION
The iswupper() function is the wide-character equivalent of the isup‐
per() 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 charac‐
ter class "upper" is disjoint from the wide character class "cntrl".
Being a subclass of the wide character class "graph", the wide charac‐
ter 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 charac‐
ter class "upper" is disjoint from the wide character class "punct".
Being a subclass of the wide character class "alpha", the wide charac‐
ter 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'.
RETURN VALUE
The iswupper() function returns non-zero if wc is a wide character
belonging to the wide character class "upper". Otherwise it returns
zero.
CONFORMING TO
C99.
SEE ALSOisupper(3), iswctype(3), towupper(3)NOTES
The behaviour of iswupper() depends on the LC_CTYPE category of the
current locale.
This function is not very appropriate for dealing with Unicode charac‐
ters, because Unicode knows about three cases: upper, lower and title
case.
GNU 1999-07-25 ISWUPPER(3)
