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)
