NAME
iswupper - test for uppercase wide character SYNOPSIS
#include
int iswupper(wintt wc); DESCRIPTION The iswupper() function is the wide-character equivalent of the isup‐ per(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-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 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 │ ├───────────┼───────────────┼────────────────┤
│iswupper() │ Thread safety │ MT-Safe locale │ └───────────┴───────────────┴────────────────┘ CONFORMING TO C99. NOTES The behavior of iswupper() depends on the LCCTYPE category of the cur‐ rent locale. This function is not very appropriate for dealing with Unicode charac‐ ters, because Unicode knows about three cases: upper, lower and title case. SEE ALSO isupper(3), iswctype(3), towupper(3) COLOPHON
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GNU 1999-07-25 ISWUPPER(3)