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97 lines
2.8 KiB
97 lines
2.8 KiB
/*
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Copyright (C) 2000 Stefan Westerfeld
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stefan@space.twc.de
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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/*
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* This source only exists because some very special programs think that
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* it is a very special idea to access /dev/dsp by the means of stdio, so
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* we need to fake FILE* access for artsdsp as well.
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*
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* To do so, it relies on glibc internals, so that it will probably not work
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* on other systems - but then again, it might not be necessary on other
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* systems, when fopen properly calls open, it might as well work unchanged.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <stdio.h>
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#include <libio.h>
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struct fd_cookie {
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int fd;
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};
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static ssize_t fdc_read (void *cookie, char *buffer, size_t size)
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{
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struct fd_cookie *fdc = (struct fd_cookie *)cookie;
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return read(fdc->fd, buffer, size);
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}
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static ssize_t fdc_write (void *cookie, const char *buffer, size_t size)
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{
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struct fd_cookie *fdc = (struct fd_cookie *)cookie;
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return write(fdc->fd, buffer, size);
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}
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static int fdc_seek (void* cookie, off64_t* position, int whence)
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{
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return -1;
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}
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static int fdc_clean (void *cookie)
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{
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struct fd_cookie *fdc = (struct fd_cookie *)cookie;
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int result = close(fdc->fd);
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free(cookie);
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return result;
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}
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static FILE *fake_fopen(const char *path, const char *mode)
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{
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cookie_io_functions_t fns = { fdc_read, fdc_write, fdc_seek, fdc_clean };
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struct fd_cookie *fdc =
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(struct fd_cookie *)malloc(sizeof(struct fd_cookie));
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const char *mptr;
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int open_mode = 0;
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FILE *result = 0;
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for(mptr = mode; *mptr; mptr++)
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{
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if(*mptr == 'r') open_mode |= 1; /* 1 = read */
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if(*mptr == 'w') open_mode |= 2; /* 2 = write */
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if(*mptr == '+') open_mode |= 3; /* 3 = readwrite */
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if(*mptr == 'a') open_mode |= 2; /* append -> write */
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}
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if(open_mode == 1) fdc->fd = open(path,O_RDONLY,0666);
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if(open_mode == 2) fdc->fd = open(path,O_WRONLY,0666);
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if(open_mode == 3) fdc->fd = open(path,O_RDWR,0666);
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if(open_mode && fdc->fd > 0)
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{
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result = fopencookie (fdc,"w", fns);
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result->_fileno = fdc->fd; /* ugly patchy slimy kludgy hack */
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}
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return result;
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}
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