sortix--sortix/libc/stdio/fputc_unlocked.c

/*******************************************************************************

    Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014, 2015.

    This file is part of the Sortix C Library.

    The Sortix C Library is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or (at your
    option) any later version.

    The Sortix C Library is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
    License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.

    stdio/fputc_unlocked.c
    Writes a character to a FILE.

*******************************************************************************/

#include <errno.h>
#include <stdio.h>

int fputc_unlocked(int c, FILE* fp)
{
	if ( !(fp->flags & _FILE_WRITABLE) )
		return errno = EBADF, fp->flags |= _FILE_STATUS_ERROR, EOF;

	if ( !(fp->flags & _FILE_BUFFER_MODE_SET) )
		setvbuf_unlocked(fp, NULL, fp->buffer_mode, 0);

	if ( fp->buffer_mode == _IONBF )
	{
		unsigned char c_char = c;
		if ( fwrite_unlocked(&c_char, sizeof(c_char), 1, fp) != 1 )
			return EOF;
		return c;
	}

	if ( !fp->write_func )
		return errno = EBADF, fp->flags |= _FILE_STATUS_ERROR, EOF;

	if ( fp->flags & _FILE_LAST_READ )
		fflush_stop_reading_unlocked(fp);

	fp->flags |= _FILE_LAST_WRITE;
	fp->flags &= ~_FILE_STATUS_EOF;

	if ( fp->amount_output_buffered == BUFSIZ )
	{
		if ( fflush_unlocked(fp) == EOF )
			return EOF;
	}

	fp->buffer[fp->amount_output_buffered++] = c;

	if ( fp->buffer_mode == _IOLBF && c == '\n' )
	{
		if ( fflush_unlocked(fp) == EOF )
			return EOF;
	}

	return c;
}