The Open Group Base Specifications Issue 7
IEEE Std 1003.1-2008, 2016 Edition
Copyright © 2001-2016 The IEEE and The Open Group

#### NAME

> iswupper, iswupper_l - test for an uppercase letter wide-character code

#### SYNOPSIS

> ``#include <wctype.h>
> int iswupper(wint_t` wc`);
> ``

> ``[CX] int iswupper_l(wint_t` wc`, locale_t` locale`);``
> `
> `

#### DESCRIPTION

> For iswupper(): [CX] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2008 defers to the ISO C standard.

> The iswupper() [CX] and iswupper_l() functions shall test whether wc is a wide-character code representing a character of class upper in the current locale, [CX] or in the locale represented by locale, respectively; see XBD Locale.

> The wc argument is a wint_t, the value of which the application shall ensure is a wide-character code corresponding to a valid character in the locale used by the function, or equal to the value of the macro WEOF. If the argument has any other value, the behavior is undefined.

> [CX] The behavior is undefined if the locale argument to iswupper_l() is the special locale object LC_GLOBAL_LOCALE or is not a valid locale object handle.

#### RETURN VALUE

> The iswupper() [CX] and iswupper_l() functions shall return non-zero if wc is an uppercase letter wide-character code; otherwise, they shall return 0.

#### ERRORS

> No errors are defined.

The following sections are informative.

#### EXAMPLES

> None.

#### APPLICATION USAGE

> To ensure applications portability, especially across natural languages, only these functions and the functions in the reference pages listed in the SEE ALSO section should be used for character classification.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> None.

#### SEE ALSO

> iswalnum, iswalpha, iswcntrl, iswctype, iswdigit, iswgraph, iswlower, iswprint, iswpunct, iswspace, iswxdigit, setlocale, uselocale

> XBD Locale, <locale.h>, <wctype.h>

#### CHANGE HISTORY

> First released in Issue 4.

#### Issue 5

> The following change has been made in this version for alignment with ISO/IEC 9899:1990/Amendment 1:1995 (E):

> - The SYNOPSIS has been changed to indicate that this function and associated data types are now made visible by inclusion of the <wctype.h> header rather than <wchar.h>.

#### Issue 6

> The normative text is updated to avoid use of the term "must" for application requirements.

#### Issue 7

> The iswupper_l() function is added from The Open Group Technical Standard, 2006, Extended API Set Part 4.

> POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0341 [302], XSH/TC1-2008/0342 [283], and XSH/TC1-2008/0343 [283] are applied.

> POSIX.1-2008, Technical Corrigendum 2, XSH/TC2-2008/0192 [685] is applied.

End of informative text.

return to top of page

UNIX ® is a registered Trademark of The Open Group.
POSIX ® is a registered Trademark of The IEEE.
Copyright © 2001-2016 The IEEE and The Open Group, All Rights Reserved
[ Main Index | XBD | XSH | XCU | XRAT ]