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ISWUPPER(3) | Linux Programmer's Manual | ISWUPPER(3) |
NAME¶
iswupper - 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 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.
CONFORMING TO¶
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¶
COLOPHON¶
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.
1999-07-25 | GNU |