код символа в потоке (character code on a stream)
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)
fputwc — put a wide-character code on a stream
Синопсис (Synopsis)
#include <stdio.h>
#include <wchar.h>
wint_t fputwc(wchar_t wc, FILE *stream);
Описание (Description)
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 fputwc() function shall write the character corresponding to
the wide-character code wc to the output stream pointed to by
stream, at the position indicated by the associated file-position
indicator for the stream (if defined), and advances the indicator
appropriately. If the file cannot support positioning requests,
or if the stream was opened with append mode, the character is
appended to the output stream. If an error occurs while writing
the character, the shift state of the output file is left in an
undefined state.
The last data modification and last file status change timestamps
of the file shall be marked for update between the successful
execution of fputwc() and the next successful completion of a
call to fflush() or fclose() on the same stream or a call to
exit() or abort().
The fputwc() function shall not change the setting of errno if
successful.
Возвращаемое значение (Return value)
Upon successful completion, fputwc() shall return wc. Otherwise,
it shall return WEOF, the error indicator for the stream shall be
set, and errno shall be set to indicate the error.
Ошибки (Error)
The fputwc() function shall fail if either the stream is
unbuffered or data in the stream's buffer needs to be written,
and:
EAGAIN The O_NONBLOCK flag is set for the file descriptor
underlying stream and the thread would be delayed in the
write operation.
EBADF The file descriptor underlying stream is not a valid file
descriptor open for writing.
EFBIG An attempt was made to write to a file that exceeds the
maximum file size or the file size limit of the process.
EFBIG The file is a regular file and an attempt was made to
write at or beyond the offset maximum associated with the
corresponding stream.
EILSEQ The wide-character code wc does not correspond to a valid
character.
EINTR The write operation was terminated due to the receipt of a
signal, and no data was transferred.
EIO A physical I/O error has occurred, or the process is a
member of a background process group attempting to write
to its controlling terminal, TOSTOP is set, the calling
thread is not blocking SIGTTOU, the process is not
ignoring SIGTTOU, and the process group of the process is
orphaned. This error may also be returned under
implementation-defined conditions.
ENOSPC There was no free space remaining on the device containing
the file.
EPIPE An attempt is made to write to a pipe or FIFO that is not
open for reading by any process. A SIGPIPE signal shall
also be sent to the thread.
The fputwc() function may fail if:
ENOMEM Insufficient storage space is available.
ENXIO A request was made of a nonexistent device, or the request
was outside the capabilities of the device.
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)
Section 2.5, Standard I/O Streams, ferror(3p), fopen(3p),
setbuf(3p), ulimit(3p)
The Base Definitions volume of POSIX.1‐2017, stdio.h(0p),
wchar.h(0p)
