| .\" Copyright (c) Bruno Haible <haible@clisp.cons.org> |
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| .\" References consulted: |
| .\" GNU glibc-2 source code and manual |
| .\" Dinkumware C library reference http://www.dinkumware.com/ |
| .\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html |
| .\" ISO/IEC 9899:1999 |
| .\" |
| .TH ISWUPPER 3 2015-08-08 "GNU" "Linux Programmer's Manual" |
| .SH NAME |
| iswupper \- test for uppercase wide character |
| .SH SYNOPSIS |
| .nf |
| .B #include <wctype.h> |
| .PP |
| .BI "int iswupper(wint_t " wc ); |
| .fi |
| .SH DESCRIPTION |
| The |
| .BR iswupper () |
| function is the wide-character equivalent of the |
| .BR isupper (3) |
| function. |
| It tests whether |
| .I wc |
| is a wide character |
| belonging to the wide-character class "upper". |
| .PP |
| 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". |
| .PP |
| Being a subclass of the wide-character class "print", the wide-character class |
| "upper" is disjoint from the wide-character class "cntrl". |
| .PP |
| 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". |
| .PP |
| Being a subclass of the wide-character class "alnum", the wide-character class |
| "upper" is disjoint from the wide-character class "punct". |
| .PP |
| Being a subclass of the wide-character class "alpha", the wide-character class |
| "upper" is disjoint from the wide-character class "digit". |
| .PP |
| The wide-character class "upper" contains at least those characters |
| .I wc |
| which are equal to |
| .I towupper(wc) |
| and different from |
| .IR towlower(wc) . |
| .PP |
| The wide-character class "upper" always contains at least the |
| letters \(aqA\(aq to \(aqZ\(aq. |
| .SH RETURN VALUE |
| The |
| .BR iswupper () |
| function returns nonzero if |
| .I wc |
| is a wide character |
| belonging to the wide-character class "upper". |
| Otherwise, it returns zero. |
| .SH ATTRIBUTES |
| For an explanation of the terms used in this section, see |
| .BR attributes (7). |
| .TS |
| allbox; |
| lb lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR iswupper () |
| T} Thread safety MT-Safe locale |
| .TE |
| .SH CONFORMING TO |
| POSIX.1-2001, POSIX.1-2008, C99. |
| .SH NOTES |
| The behavior of |
| .BR iswupper () |
| depends on the |
| .B LC_CTYPE |
| category of the |
| current locale. |
| .PP |
| This function is not very appropriate for dealing with Unicode characters, |
| because Unicode knows about three cases: upper, lower and title case. |
| .SH SEE ALSO |
| .BR isupper (3), |
| .BR iswctype (3), |
| .BR towupper (3) |