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/* mpsioan.c: RAVENBROOK MEMORY POOL SYSTEM I/O IMPLEMENTATION (ANSI)
*
* $Id$
* Copyright (c) 2001-2020 Ravenbrook Limited. See end of file for license.
*
* .readership: For MPS client application developers and MPS developers.
* .sources: <design/io>
*/
#include "mpsio.h"
#include "mpstd.h"
/* We don't want to use the ANSI assert() to check that the interface
* is being used correctly, because it's not controlled by the MPS
* variety mechanism: we might end up with assertions being turned on
* in the HOT variety or turned off in the COOL variety (depending on
* whether or not the client program compiles the MPS with NDEBUG
* defined). So we include "check.h" and use AVER() instead. See
* job003504. If you are developing your own plinth, you should
* consider whether to use your own preferred assertion mechanism
* instead.
*/
#include "check.h"
#include "config.h" /* to get platform configurations */
#include <stdio.h>
#include <stdlib.h>
static FILE *ioFile = NULL;
#ifdef MPS_BUILD_MV
/* MSVC warning 4996 = stdio / C runtime 'unsafe' */
/* Objects to: fopen. See job001934. */
#pragma warning( disable : 4996 )
#endif
mps_res_t mps_io_create(mps_io_t *mps_io_r)
{
FILE *f;
const char *filename;
if(ioFile != NULL) /* See <code/event.c#trans.log> */
return MPS_RES_LIMIT; /* Cannot currently open more than one log */
filename = getenv("MPS_TELEMETRY_FILENAME");
if(filename == NULL)
filename = "mpsio.log";
f = fopen(filename, "wb");
if(f == NULL)
return MPS_RES_IO;
*mps_io_r = (mps_io_t)f;
ioFile = f;
return MPS_RES_OK;
}
void mps_io_destroy(mps_io_t mps_io)
{
FILE *f = (FILE *)mps_io;
AVER(f == ioFile);
AVER(f != NULL);
ioFile = NULL;
(void)fclose(f);
}
mps_res_t mps_io_write(mps_io_t mps_io, void *buf, size_t size)
{
FILE *f = (FILE *)mps_io;
size_t n;
AVER(f == ioFile);
AVER(f != NULL);
n = fwrite(buf, size, 1, f);
if(n != 1)
return MPS_RES_IO;
return MPS_RES_OK;
}
mps_res_t mps_io_flush(mps_io_t mps_io)
{
FILE *f = (FILE *)mps_io;
int e;
AVER(f == ioFile);
AVER(f != NULL);
e = fflush(f);
if(e == EOF)
return MPS_RES_IO;
return MPS_RES_OK;
}
/* C. COPYRIGHT AND LICENSE
*
* Copyright (C) 2001-2020 Ravenbrook Limited <https://www.ravenbrook.com/>.
*
* 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.
*
* 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
* HOLDER 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.
*/
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