The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

NAME

iswalpha - test for an alphabetic wide-character code

SYNOPSIS

#include <wctype.h>

int iswalpha(wint_t
wc);

DESCRIPTION

[CX] [Option Start] 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 IEEE Std 1003.1-2001 defers to the ISO C standard. [Option End]

The iswalpha() function shall test whether wc is a wide-character code representing a character of class alpha in the program's current locale; see the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 7, 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 current locale, or equal to the value of the macro WEOF. If the argument has any other value, the behavior is undefined.

RETURN VALUE

The iswalpha() function shall return non-zero if wc is an alphabetic wide-character code; otherwise, it 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 this function and those listed in the SEE ALSO section should be used for classification of wide-character codes.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

iswalnum(), iswcntrl(), iswctype(), iswdigit(), iswgraph(), iswlower(), iswprint(), iswpunct(), iswspace(), iswupper(), iswxdigit(), setlocale(), the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 7, Locale, <stdio.h>, <wchar.h>, <wctype.h>

CHANGE HISTORY

First released in Issue 4.

Issue 5

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

Issue 6

The DESCRIPTION is updated to avoid use of the term "must" for application requirements.

End of informative text.

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