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buffer_stdio.c
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/*
* Copyright (c) 2018-2019 Josef 'Jeff' Sipek <[email protected]>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "buffer_impl.h"
static int stdio_buffer_check_truncate(struct buffer *buffer, size_t size)
{
return -ESPIPE;
}
static ssize_t stdio_buffer_check_seek(struct buffer *buffer, off_t offset,
int whence, size_t newoff)
{
/* allow no-op seeks */
if (newoff == buffer->size)
return 0;
return -ENOTSUP;
}
static void stdio_buffer_copyin(struct buffer *buffer, size_t off,
const void *newdata, size_t newdatalen)
{
if (fwrite(newdata, newdatalen, 1, buffer->private) != 1)
panic("%s: failed to write data to buffer: %s", __func__,
strerror(errno));
}
static void stdio_buffer_copyout(struct buffer *buffer, size_t off,
void *data, size_t datalen)
{
if (fread(data, datalen, 1, buffer->private) != 1)
panic("%s: failed to read data from buffer: %s", __func__,
strerror(errno));
}
const struct buffer_ops stdio_buffer = {
.check_truncate = stdio_buffer_check_truncate,
.check_seek = stdio_buffer_check_seek,
/*
* no need for:
* - realloc since we use SIZE_MAX alloc size
* - free since there is nothing to free
*/
.clear = generic_buffer_clear_panic,
.copyin = stdio_buffer_copyin,
.copyout = stdio_buffer_copyout,
};