тест на шестнадцатеричную цифру (test for a hexadecimal digit)
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)
isxdigit, isxdigit_l — test for a hexadecimal digit
Синопсис (Synopsis)
#include <ctype.h>
int isxdigit(int c);
int isxdigit_l(int c, locale_t locale);
Описание (Description)
For isxdigit(): 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 isxdigit() and isxdigit_l() functions shall test whether c is
a character of class xdigit 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 c argument is an int, the value of which the application
shall ensure is a character representable as an unsigned char or
equal to the value of the macro EOF. If the argument has any
other value, the behavior is undefined.
The behavior is undefined if the locale argument to isxdigit_l()
is the special locale object LC_GLOBAL_LOCALE or is not a valid
locale object handle.
Возвращаемое значение (Return value)
The isxdigit() and isxdigit_l() functions shall return non-zero
if c is a hexadecimal digit; 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)
isalnum(3p), isalpha(3p), isblank(3p), iscntrl(3p), isdigit(3p),
isgraph(3p), islower(3p), isprint(3p), ispunct(3p), isspace(3p),
isupper(3p)
The Base Definitions volume of POSIX.1‐2017, Chapter 7, Locale,
ctype.h(0p)
