транслитерация символов (character transliteration)
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)
towctrans, towctrans_l — wide-character transliteration
Синопсис (Synopsis)
#include <wctype.h>
wint_t towctrans(wint_t wc, wctrans_t desc);
wint_t towctrans_l(wint_t wc, wctrans_t desc,
locale_t locale);
Описание (Description)
For towctrans(): 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 towctrans() and towctrans_l() functions shall transliterate
the wide-character code wc using the mapping described by desc.
The current setting of the LC_CTYPE category in the current
locale or in the locale represented by locale, respectively,
should be the same as during the call to wctrans() or wctrans_l()
that returned the value desc.
If the value of desc is invalid (that is, not obtained by a call
to wctrans() or desc is invalidated by a subsequent call to
setlocale() that has affected category LC_CTYPE), the result is
unspecified.
If the value of desc is invalid (that is, not obtained by a call
to wctrans_l() with the same locale object locale) the result is
unspecified.
An application wishing to check for error situations should set
errno to 0 before calling towctrans() or towctrans_l().
If errno is non-zero on return, an error has occurred.
The behavior is undefined if the locale argument to towctrans_l()
is the special locale object LC_GLOBAL_LOCALE or is not a valid
locale object handle.
Возвращаемое значение (Return value)
If successful, the towctrans() and towctrans_l() functions shall
return the mapped value of wc using the mapping described by
desc. Otherwise, they shall return wc unchanged.
Ошибки (Error)
These functions may fail if:
EINVAL desc contains an invalid transliteration descriptor.
The following sections are informative.
Примеры (Examples)
None.
Использование в приложениях (Application usage)
The strings "tolower" and "toupper" are reserved for the standard
mapping names. In the table below, the functions in the left
column are equivalent to the functions in the right column.
towlower(wc) towctrans(wc, wctrans("tolower"))
towlower_l(wc, locale) towctrans_l(wc, wctrans("tolower"), locale)
towupper(wc) towctrans(wc, wctrans("toupper"))
towupper_l(wc, locale) towctrans_l(wc, wctrans("toupper"), locale)
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
towlower(3p), towupper(3p), wctrans(3p)
The Base Definitions volume of POSIX.1‐2017, wctype.h(0p)
