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__open.c
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C/C++ Source or Header
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1996-09-28
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3KB
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118 lines
/*
* This file is part of ixemul.library for the Amiga.
* Copyright (C) 1991, 1992 Markus M. Wild
*
* 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; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define _KERNEL
#include <string.h>
#include "ixemul.h"
#include <utility/tagitem.h>
#include <dos/dostags.h>
struct open_vec {
int action;
struct FileHandle *fh;
};
static int
__open_func (struct StandardPacket *sp, struct MsgPort *handler,
BPTR parent_lock,
BSTR name,
struct open_vec *ov, int *no_error)
{
sp->sp_Pkt.dp_Type = ov->action;
sp->sp_Pkt.dp_Arg1 = CTOBPTR (ov->fh);
sp->sp_Pkt.dp_Arg2 = parent_lock;
sp->sp_Pkt.dp_Arg3 = name;
PutPacket (handler, sp);
__wait_sync_packet (sp);
*no_error = sp->sp_Pkt.dp_Res1 == -1;
/* handler is supposed to supply this, but if it didn't... */
if (*no_error && !ov->fh->fh_Type) ov->fh->fh_Type = handler;
/* continue if we failed because of symlink - reference */
return 1;
}
BPTR
__open (char *name, int action)
{
unsigned long *fh;
struct open_vec ov;
BPTR res;
struct Process *this_proc = NULL;
APTR oldwin = NULL;
char buf[32], *s, *p = buf;
if ((name[0] == '/' && strnicmp(name, "/dev/", 5)) ||
(index(name, ':') && strnicmp(name, "dev:", 4)))
{
s = (name[0] == '/') ? name + 1 : name;
while (*s && *s != '/' && *s != ':')
*p++ = *s++;
*p++ = ':';
*p = '\0';
if (ix.ix_flags & ix_no_insert_disk_requester)
{
this_proc = (struct Process *)FindTask (0);
oldwin = this_proc->pr_WindowPtr;
this_proc->pr_WindowPtr = (APTR)-1;
}
if (!IsFileSystem(buf)) /* if NAME is not a file system but */
/* something like a pipe or console, then */
/* do NOT use __plock() but call Open directly */
{
if (!*s)
res = Open(buf, action);
else if (*s == '/')
{
*s = ':';
res = Open(name + 1, action);
*s = '/';
}
else
res = Open(name, action);
if (ix.ix_flags & ix_no_insert_disk_requester)
this_proc->pr_WindowPtr = oldwin;
return res;
}
if (ix.ix_flags & ix_no_insert_disk_requester)
this_proc->pr_WindowPtr = oldwin;
}
/* needed to get berserk ReadArgs() to behave sane, GRRR */
fh = AllocDosObjectTags (DOS_FILEHANDLE, ADO_FH_Mode, action, TAG_DONE);
if (! fh)
return 0;
ov.fh = (struct FileHandle *) fh;
ov.action = action;
res = __plock (name, __open_func, &ov);
/* check for opening of NIL:, in which case we just return
a filehandle with a zero handle field */
if (! res && IoErr() == 4242)
res = -1;
if (! res)
FreeDosObject (DOS_FILEHANDLE, fh);
return res ? CTOBPTR(ov.fh) : 0;
}