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disk_079
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assigndev
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assigndev.c
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C/C++ Source or Header
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1992-05-06
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5KB
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168 lines
/****************************************************************************
*
* A S S I G N D E V . C
*
* Duplicate a device in place--Allowing multiple names to a device.
*
* Phillip Lindsay (c) 1987 Commodore-Amiga, Inc.
* Unlimited use granted as long as copyright remains intact.
****************************************************************************/
#include <exec/types.h>
#include <exec/nodes.h>
#include <exec/lists.h>
#include <exec/memory.h>
#include <libraries/dos.h>
#include <libraries/dosextens.h>
#include <libraries/filehandler.h>
#ifdef AZTEC_C
#include <functions.h>
#include <stdio.h>
#else
#include <lattice/stdio.h>
#endif
extern struct DosLibrary *DOSBase;
/*
* external functions found in "misc.c"
*/
extern BSTR ctob();
extern char *allocstr(),
*btoc(),
*strupper();
extern BOOL ourdevnode();
extern BOOL finddosnode();
extern VOID freedev(),
dupdev(),
adddosnode(),
trunc(),
memfill(),
memcpy();
main(argc,argv)
int argc;
char **argv;
{
struct RootNode *rnode; /* root node pointer */
struct DosInfo *dinfo; /* DOS info pointer */
register struct DeviceNode *dnode; /* device entry pointer */
register struct DeviceNode *lastdnode; /* last device pointer */
char *bname, /* tmp. ptr to bstr */
name[32], /* tmp. for device name */
*oldname, /* existing device name */
*newname; /* new device name */
LONG error = 1; /* flag error - 1 initially */
if(argc == 3) /* duplicate given device */
{
newname = argv[1];
trunc(strupper(newname),':');
if( finddosnode(newname) )
{
printf("Error: Device %s: already exists.\n",newname);
exit(0);
}
oldname = argv[2];
trunc(strupper(oldname),':');
}
else if(argc == 2) /* try and remove specified device */
{
oldname = argv[1];
trunc(strupper(oldname),':');
newname = NULL;
}
else /* ??? give them usage info */
{
printf("Usage: %s [new device] [old device]\n",argv[0]);
printf(" %s [old device]\n",argv[0]);
exit(0);
}
rnode = (struct RootNode *) DOSBase->dl_Root; /* find root node */
dinfo = (struct DosInfo *) BADDR(rnode->rn_Info); /* now dos info */
/*
* Here we search for the given device name and once found we will duplicate
* the entire device data structure. Then we add a new device node with
* the supplied name to the device list. If no "newname" is specified the
* given device is removed from the device list and free memory for the device
* node and device name. (normally you only delete nodes you created...I do
* take precautions to NOT delete existing system devices...I add a key to
* the end of the device name to flag the device node as being created by
* ASSIGNDEV.
*/
lastdnode = NULL;
if(!newname)
printf("Removing Device %s:\n",oldname);
else
printf("Duplicating Device %s: -> %s:\n",oldname,newname);
Forbid(); /* protect ourselves */
for(dnode = (struct DeviceNode *) BADDR(dinfo->di_DevInfo); ( dnode );
dnode = (struct DeviceNode *) BADDR(dnode->dn_Next))
{
if( dnode->dn_Type == DLT_DEVICE ) /* Are dealing with a device? */
{
bname = (char *) BADDR(dnode->dn_Name);
memcpy(bname, name, (ULONG)( bname[0] + 1 ) );
if( !( strcmp( oldname, strupper(btoc(name)) ) ) )
{
error = FALSE;
if( newname )
dupdev(dnode,newname);
else if( lastdnode )
{
if( ourdevnode(dnode) )
{
lastdnode->dn_Next = dnode->dn_Next;
freedev(dnode);
}
else
error = 2;
}
else
{
if( ourdevnode(dnode) )
{
dinfo->di_DevInfo = dnode->dn_Next;
freedev(dnode);
}
else
error = 2;
}
break;
}
}
lastdnode = dnode;
}
Permit();
if(error == 1)
puts("Error: Device not found.");
else if(error == 2)
puts("Error: Cannot remove device.");
exit(0);
}
/* eof */