вернуть широкий символ в поток ФАЙЛОВ (push back a wide character onto a FILE stream)
Имя (Name)
ungetwc - push back a wide character onto a FILE stream
Синопсис (Synopsis)
#include <wchar.h>
wint_t ungetwc(wint_t wc, FILE *stream);
Описание (Description)
The ungetwc() function is the wide-character equivalent of the
ungetc(3) function. It pushes back a wide character onto stream
and returns it.
If wc is WEOF, it returns WEOF. If wc is an invalid wide
character, it sets errno to EILSEQ and returns WEOF.
If wc is a valid wide character, it is pushed back onto the
stream and thus becomes available for future wide-character read
operations. The file-position indicator is decremented by one or
more. The end-of-file indicator is cleared. The backing storage
of the file is not affected.
Note: wc need not be the last wide-character read from the
stream; it can be any other valid wide character.
If the implementation supports multiple push-back operations in a
row, the pushed-back wide characters will be read in reverse
order; however, only one level of push-back is guaranteed.
Возвращаемое значение (Return value)
The ungetwc() function returns wc when successful, or WEOF upon
failure.
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ungetwc() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
POSIX.1-2001, POSIX.1-2008, C99.
Примечание (Note)
The behavior of ungetwc() depends on the LC_CTYPE category of the
current locale.
Смотри также (See also)
fgetwc(3)
