определить отображение символов (define character mapping)
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)
wctrans, wctrans_l — define character mapping
Синопсис (Synopsis)
#include <wctype.h>
wctrans_t wctrans(const char *charclass);
wctrans_t wctrans_l(const char *charclass, locale_t locale);
Описание (Description)
For wctrans(): 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 wctrans() and wctrans_l() functions are defined for valid
character mapping names identified in the current locale. The
charclass is a string identifying a generic character mapping
name for which codeset-specific information is required. The
following character mapping names are defined in all locales:
tolower and toupper.
These functions shall return a value of type wctrans_t, which can
be used as the second argument to subsequent calls of towctrans()
and towctrans_l().
The wctrans() and wctrans_l() functions shall determine values of
wctrans_t according to the rules of the coded character set
defined by character mapping information in the current locale or
in the locale represented by locale, respectively (category
LC_CTYPE).
The values returned by wctrans() shall be valid until a call to
setlocale() that modifies the category LC_CTYPE.
The values returned by wctrans_l() shall be valid only in calls
to towctrans_l() with a locale represented by locale with the
same LC_CTYPE category value.
The behavior is undefined if the locale argument to wctrans_l()
is the special locale object LC_GLOBAL_LOCALE or is not a valid
locale object handle.
Возвращаемое значение (Return value)
The wctrans() and wctrans_l() functions shall return 0 and may
set errno to indicate the error if the given character mapping
name is not valid for the current locale (category LC_CTYPE);
otherwise, they shall return a non-zero object of type wctrans_t
that can be used in calls to towctrans() and towctrans_l().
Ошибки (Error)
These functions may fail if:
EINVAL The character mapping name pointed to by charclass is not
valid in the current locale.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
towctrans(3p)
The Base Definitions volume of POSIX.1‐2017, wctype.h(0p)
