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/*
Copyright (C) 2000 Stefan Westerfeld
stefan@space.twc.de
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/*
* This source only exists because some very special programs think that
* it is a very special idea to access /dev/dsp by the means of stdio, so
* we need to fake FILE* access for artsdsp as well.
*
* To do so, it relies on glibc internals, so that it will probably not work
* on other systems - but then again, it might not be necessary on other
* systems, when fopen properly calls open, it might as well work unchanged.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdio.h>
#include <libio.h>
struct fd_cookie {
int fd;
};
static ssize_t fdc_read (void *cookie, char *buffer, size_t size)
{
struct fd_cookie *fdc = (struct fd_cookie *)cookie;
return read(fdc->fd, buffer, size);
}
static ssize_t fdc_write (void *cookie, const char *buffer, size_t size)
{
struct fd_cookie *fdc = (struct fd_cookie *)cookie;
return write(fdc->fd, buffer, size);
}
static int fdc_seek (void* cookie, off64_t* position, int whence)
{
return -1;
}
static int fdc_clean (void *cookie)
{
struct fd_cookie *fdc = (struct fd_cookie *)cookie;
int result = close(fdc->fd);
free(cookie);
return result;
}
static FILE *fake_fopen(const char *path, const char *mode)
{
cookie_io_functions_t fns = { fdc_read, fdc_write, fdc_seek, fdc_clean };
struct fd_cookie *fdc =
(struct fd_cookie *)malloc(sizeof(struct fd_cookie));
const char *mptr;
int open_mode = 0;
FILE *result = 0;
for(mptr = mode; *mptr; mptr++)
{
if(*mptr == 'r') open_mode |= 1; /* 1 = read */
if(*mptr == 'w') open_mode |= 2; /* 2 = write */
if(*mptr == '+') open_mode |= 3; /* 3 = readwrite */
if(*mptr == 'a') open_mode |= 2; /* append -> write */
}
if(open_mode == 1) fdc->fd = open(path,O_RDONLY,0666);
if(open_mode == 2) fdc->fd = open(path,O_WRONLY,0666);
if(open_mode == 3) fdc->fd = open(path,O_RDWR,0666);
if(open_mode && fdc->fd > 0)
{
result = fopencookie (fdc,"w", fns);
result->_fileno = fdc->fd; /* ugly patchy slimy kludgy hack */
}
return result;
}
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