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os2file.c
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C/C++ Source or Header
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1999-01-02
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168 lines
/* -*-C-*-
$Id: os2file.c,v 1.3 1999/01/02 06:11:34 cph Exp $
Copyright (c) 1994-1999 Massachusetts Institute of Technology
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.
This program 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "os2.h"
#include "osfile.h"
static ULONG set_file_pointer (Tchannel, ULONG, LONG);
#define OS2_OPEN_MODE(m) \
(((((m) & CHANNEL_READ) == 0) \
? (OPEN_ACCESS_WRITEONLY | OPEN_SHARE_DENYWRITE) \
: (((m) & CHANNEL_WRITE) == 0) \
? (OPEN_ACCESS_READONLY | OPEN_SHARE_DENYNONE) \
: (OPEN_ACCESS_READWRITE | OPEN_SHARE_DENYWRITE)) \
| OPEN_FLAGS_NOINHERIT)
static Tchannel
open_file (const char * filename, ULONG attr, ULONG flags, unsigned int mode)
{
HFILE handle;
ULONG action;
STD_API_CALL
(dos_open, (((char *) filename), (&handle), (&action), 0, attr, flags,
(OS2_OPEN_MODE (mode)), 0));
return (OS2_make_channel (handle, mode));
}
Tchannel
OS_open_input_file (const char * filename)
{
return
(open_file (filename,
FILE_NORMAL,
(OPEN_ACTION_OPEN_IF_EXISTS | OPEN_ACTION_FAIL_IF_NEW),
CHANNEL_READ));
}
Tchannel
OS_open_output_file (const char * filename)
{
return
(open_file (filename,
FILE_NORMAL,
(OPEN_ACTION_REPLACE_IF_EXISTS | OPEN_ACTION_CREATE_IF_NEW),
CHANNEL_WRITE));
}
Tchannel
OS_open_io_file (const char * filename)
{
return
(open_file (filename,
FILE_NORMAL,
(OPEN_ACTION_OPEN_IF_EXISTS | OPEN_ACTION_CREATE_IF_NEW),
(CHANNEL_READ | CHANNEL_WRITE)));
}
Tchannel
OS_open_append_file (const char * filename)
{
Tchannel channel =
(open_file (filename,
FILE_NORMAL,
(OPEN_ACTION_OPEN_IF_EXISTS | OPEN_ACTION_CREATE_IF_NEW),
CHANNEL_WRITE));
transaction_begin ();
OS_channel_close_on_abort (channel);
(void) set_file_pointer (channel, FILE_END, 0);
transaction_commit ();
return (channel);
}
static Tchannel
open_file_noerror (const char * filename, ULONG attr, ULONG flags,
unsigned int mode)
{
HFILE handle;
ULONG action;
if ((dos_open (((char *) filename), (&handle), (&action), 0, attr, flags,
(OS2_OPEN_MODE (mode)), 0))
!= NO_ERROR)
return (NO_CHANNEL);
{
Tchannel channel = (OS2_make_channel (handle, mode));
if ((CHANNEL_TYPE (channel)) == channel_type_file)
return (channel);
OS_channel_close_noerror (channel);
return (NO_CHANNEL);
}
}
Tchannel
OS_open_load_file (const char * filename)
{
return
(open_file_noerror
(filename,
FILE_NORMAL,
(OPEN_ACTION_OPEN_IF_EXISTS | OPEN_ACTION_FAIL_IF_NEW),
CHANNEL_READ));
}
Tchannel
OS_open_dump_file (const char * filename)
{
return
(open_file_noerror
(filename,
FILE_NORMAL,
(OPEN_ACTION_REPLACE_IF_EXISTS | OPEN_ACTION_CREATE_IF_NEW),
CHANNEL_WRITE));
}
off_t
OS_file_length (Tchannel channel)
{
FILESTATUS3 buffer;
if ((CHANNEL_TYPE (channel)) != channel_type_file)
OS2_error_system_call (ERROR_INVALID_HANDLE, syscall_dos_query_file_info);
STD_API_CALL
(dos_query_file_info,
((CHANNEL_HANDLE (channel)), FIL_STANDARD,
(&buffer), (sizeof (buffer))));
return (buffer.cbFile);
}
off_t
OS_file_position (Tchannel channel)
{
return (set_file_pointer (channel, FILE_CURRENT, 0));
}
void
OS_file_set_position (Tchannel channel, off_t position)
{
if ((set_file_pointer (channel, FILE_BEGIN, position)) != position)
OS2_error_anonymous ();
}
static ULONG
set_file_pointer (Tchannel channel, ULONG type, LONG distance)
{
ULONG fp;
if ((CHANNEL_TYPE (channel)) != channel_type_file)
OS2_error_system_call (ERROR_INVALID_HANDLE, syscall_dos_set_file_ptr);
STD_API_CALL
(dos_set_file_ptr, ((CHANNEL_HANDLE (channel)), distance, type, (&fp)));
return (fp);
}