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/*
* Creation Date: <2003/12/07 19:36:00 samuel>
* Time-stamp: <2004/01/07 19:28:43 samuel>
*
* <diskio.c>
*
* I/O wrappers
*
* Copyright (C) 2003, 2004 Samuel Rydh (samuel@ibrium.se)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2
*
*/
#include "openbios/config.h"
#include "openbios/bindings.h"
#include "libc/diskio.h"
typedef struct {
ihandle_t ih;
int do_close;
xt_t read_xt;
xt_t seek_xt;
xt_t reopen_xt;
xt_t tell_xt;
xt_t get_path_xt;
xt_t get_fstype_xt;
xt_t open_nwrom_xt;
xt_t volume_name_xt;
} priv_fd_t;
#define MAX_FD 32
static priv_fd_t *file_descriptors[MAX_FD];
static int
lookup_xt( ihandle_t ih, const char *method, xt_t *xt )
{
if( *xt )
return 0;
*xt = find_ih_method( method, ih );
return (*xt) ? 0:1;
}
int
open_ih( ihandle_t ih )
{
xt_t read_xt=0, seek_xt=0;
priv_fd_t *fdp;
int fd;
if( !ih || lookup_xt(ih, "read", &read_xt) )
return -1;
if( lookup_xt(ih, "seek", &seek_xt) )
return -1;
for (fd=0; fd<MAX_FD; fd++)
if(file_descriptors[fd]==NULL)
break;
if(fd==MAX_FD)
return -1;
fdp = malloc( sizeof(*fdp) );
/* Better clear the fd, as it
* contains valuable information
*/
memset(fdp, 0, sizeof(*fdp));
fdp->ih = ih;
fdp->read_xt = read_xt;
fdp->seek_xt = seek_xt;
fdp->do_close = 0;
file_descriptors[fd]=fdp;
return fd;
}
int
open_io( const char *spec )
{
int fd;
ihandle_t ih = open_dev( spec );
priv_fd_t *fdp;
if( !ih )
return -1;
if( (fd=open_ih(ih)) == -1 ) {
close_dev( ih );
return -1;
}
fdp = file_descriptors[fd];
fdp->do_close = 1;
return fd;
}
int
reopen( int fd, const char *filename )
{
priv_fd_t *fdp = file_descriptors[fd];
int ret;
if( lookup_xt(fdp->ih, "reopen", &fdp->reopen_xt) )
return -1;
push_str( filename );
call_package( fdp->reopen_xt, fdp->ih );
ret = (POP() == (ucell)-1)? 0 : -1;
return ret;
}
int
reopen_nwrom( int fd )
{
priv_fd_t *fdp = file_descriptors[fd];
if( lookup_xt(fdp->ih, "open-nwrom", &fdp->open_nwrom_xt) )
return -1;
call_package( fdp->open_nwrom_xt, fdp->ih );
return (POP() == (ucell)-1)? 0 : -1;
}
ihandle_t
get_ih_from_fd( int fd )
{
priv_fd_t *fdp = file_descriptors[fd];
return fdp->ih;
}
const char *
get_file_path( int fd )
{
priv_fd_t *fdp = file_descriptors[fd];
if( lookup_xt(fdp->ih, "get-path", &fdp->get_path_xt) )
return NULL;
call_package( fdp->get_path_xt, fdp->ih );
return (char*)POP();
}
const char *
get_volume_name( int fd )
{
priv_fd_t *fdp = file_descriptors[fd];
if( lookup_xt(fdp->ih, "volume-name", &fdp->volume_name_xt) )
return NULL;
call_package( fdp->volume_name_xt, fdp->ih );
return (char*)POP();
}
const char *
get_fstype( int fd )
{
priv_fd_t *fdp = file_descriptors[fd];
if( lookup_xt(fdp->ih, "get-fstype", &fdp->get_fstype_xt) )
return NULL;
call_package( fdp->get_fstype_xt, fdp->ih );
return (char*)POP();
}
int
read_io( int fd, void *buf, size_t cnt )
{
priv_fd_t *fdp = file_descriptors[fd];
ucell ret;
PUSH( (ucell)buf );
PUSH( cnt );
call_package( fdp->read_xt, fdp->ih );
ret = POP();
if( !ret && cnt )
ret = -1;
return ret;
}
int
seek_io( int fd, llong offs )
{
priv_fd_t *fdp = file_descriptors[fd];
DPUSH( offs );
call_package( fdp->seek_xt, fdp->ih );
return ((((cell)POP()) >= 0)? 0 : -1);
}
llong
tell( int fd )
{
priv_fd_t *fdp = file_descriptors[fd];
llong offs;
if( lookup_xt(fdp->ih, "tell", &fdp->tell_xt) )
return -1;
call_package( fdp->tell_xt, fdp->ih );
offs = DPOP();
return offs;
}
int
close_io( int fd )
{
priv_fd_t *fdp = file_descriptors[fd];
if( fdp->do_close )
close_dev( fdp->ih );
free( fdp );
file_descriptors[fd]=NULL;
return 0;
}
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