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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <unistd.h>
#define WRITE_BUF_SIZE 128
/* TODO: Allocate these once malloc() is implemented */
static FILE default_stream;
static char default_write_buf[WRITE_BUF_SIZE];
FILE*
fdopen(int fd, const char *mode)
{
FILE *stream;
int flags;
if (mode == NULL)
return NULL;
/* Determine stream flags */
flags = 0;
switch (mode[0]) {
case 'r':
flags |= FILE_READ;
if (mode[1] == '+') {
flags |= FILE_WRITE;
}
break;
case 'w':
case 'a':
flags |= FILE_WRITE;
if (mode[1] == '+') {
flags |= FILE_READ;
}
break;
default:
return NULL;
}
/* Create stream */
stream = &default_stream;
stream->fd = fd;
stream->flags = flags;
/* Create write buffer if needed */
if (flags & FILE_WRITE) {
stream->write_buf = default_write_buf;
stream->write_pos = stream->write_buf;
stream->write_end = stream->write_buf + WRITE_BUF_SIZE;
}
return stream;
}
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