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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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iswupper(3) Library Functions Manual iswupper(3)
iswupper - test for uppercase wide character
Standard C library (libc, -lc)
#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 │
└───────────────────────────────┴───────────────┴────────────────┘
C11, POSIX.1-2008.
POSIX.1-2001, 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 the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
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2025-02-02. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
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Linux man-pages 6.10 2024-07-23 iswupper(3)
Pages that refer to this page: isalpha(3), iswctype(3), towupper(3)
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HTML rendering created 2025-02-02 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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