iswupper(3)

NAME
iswupper - test for uppercase wide character

LIBRARY
Standard C library (libc, -lc)

SYNOPSIS
#include <wctype.h>

int iswupper(wint_t wc);

DESCRIPTION
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'.

RETURN VALUE
The iswupper() function returns nonzero if wc is a wide character belonging to the wide-character class "upper". Otherwise, it returns zero.

ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value
 | Thread safety | MT-Safe locale

STANDARDS
C11, POSIX.1-2008.

HISTORY
POSIX.1-2001, C99.

NOTES
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.

SEE ALSO
isupper(3), iswctype(3), towupper(3)