man/man3c/fputwc.3c

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 Copyright (c) 1992, X/Open Company Limited. All Rights Reserved.
 Portions Copyright (c) 2002, Sun Microsystems, Inc. All Rights Reserved.

 FPUTWC 3C "March 25, 2020"
 NAME
fputwc, putwc, putwchar - put wide-character code on a stream
 SYNOPSIS
#include <stdio.h>
#include <wchar.h>

wint_t fputwc(wchar_t wc, FILE*stream);


wint_t putwc(wchar_t wc, FILE*stream);


#include <wchar.h>

wint_t putwchar(wchar_t wc);


 DESCRIPTION
The fputwc() function writes 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 st_ctime and st_mtime fields of the file will be marked for
update between the successful execution of fputwc() and the next
successful completion of a call to fflush(3C) or fclose(3C) on the
same stream or a call to exit(2) or abort(3C).

The putwc() function is equivalent to fputwc(), except that it is
implemented as a macro.

The call putwchar(wc) is equivalent to
putwc(wc, stdout). The putwchar() routine is
implemented as a macro.
 RETURN VALUES
Upon successful completion, fputwc(), putwc(), and putwchar()
return wc. Otherwise, they return WEOF, the error indicator for the
stream is set, and errno is set to indicate the error.
 ERRORS
The fputwc(), putwc(), and putwchar() functions will 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 process 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 process's file size limit; or the file is a regular file and an attempt was
made to write at or beyond the offset maximum associated with the corresponding
stream.


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 process is neither ignoring nor blocking SIGTTOU, and the
process group of the process is orphaned. stream was created by
open_wmemstream(3C) and a wide-character or byte sequence buffered is
invalid in the current locale.


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 will also be sent to the calling
thread.


The fputwc(), putwc(), and putwchar() functions may fail if:
ENOMEM

Insufficient storage space is available.


ENXIO

A request was made of a non-existent device, or the request was outside the
capabilities of the device.


EILSEQ

The wide-character code wc does not correspond to a valid character.


 USAGE
Functions exist for the putwc() and putwchar() macros. To get the
function form, the macro name must be undefined (for example, #undef
putc).

When the macro form is used, putwc() evaluates the stream argument
more than once. In particular, putwc(wc, *f++)
does not work sensibly. The fputwc() function should be used instead
when evaluating the stream argument has side effects.
 ATTRIBUTES
See attributes(5) for descriptions of the following attributes:


ATTRIBUTE TYPE ATTRIBUTE VALUE
Interface Stability Standard
MT-Level MT-Safe


 SEE ALSO
exit(2), ulimit(2), abort(3C), fclose(3C),
ferror(3C), fflush(3C), fopen(3C), setbuf(3C),
attributes(5), standards(5)