Путеводитель по Руководству Linux

  User  |  Syst  |  Libr  |  Device  |  Files  |  Other  |  Admin  |  Head  |



   iswalpha.3p    ( 3 )

код символа (character code)

Пролог (Prolog)

This manual page is part of the POSIX Programmer's Manual.  The
       Linux implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior),
       or the interface may not be implemented on Linux.

Имя (Name)

iswalpha, iswalpha_l — test for an alphabetic wide-character code

Синопсис (Synopsis)

#include <wctype.h>

int iswalpha(wint_t wc); int iswalpha_l(wint_t wc, locale_t locale);


Описание (Description)

For iswalpha(): 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.1‐2017 defers to the ISO C
       standard.

The iswalpha() and iswalpha_l() functions shall test whether wc is a wide-character code representing a character of class alpha in the current locale, or in the locale represented by locale, respectively; see the Base Definitions volume of POSIX.1‐2017, 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 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.

The behavior is undefined if the locale argument to iswalpha_l() is the special locale object LC_GLOBAL_LOCALE or is not a valid locale object handle.


Возвращаемое значение (Return value)

The iswalpha() and iswalpha_l() functions shall return non-zero
       if wc is an alphabetic wide-character code; otherwise, they shall
       return 0.

Ошибки (Error)

No errors are defined.

The following sections are informative.


Примеры (Examples)

None.

Использование в приложениях (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.

Обоснование (Rationale)

None.

Будущие направления (Future directions)

None.

Смотри также (See also)

iswalnum(3p), iswcntrl(3p), iswctype(3p), iswdigit(3p),
       iswgraph(3p), iswlower(3p), iswprint(3p), iswpunct(3p),
       iswspace(3p), iswupper(3p), iswxdigit(3p), setlocale(3p),
       uselocale(3p)

The Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale, locale.h(0p), wctype.h(0p)