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TestBits.c
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1993-10-22
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/* --------------------------------- -------
* |\ | | | | | |.| | \| |/ /|\ |||||||
* | | | |/ | |\ |/ |/| |\ |/ | ? ---+--- =<
* | | | | | | | | | | | \qqqqqqqqq/
* --------------------------------- ~~~~~~~~~~~~~~~~
* TestBits - tests whether one or more protection flags are set.
* Copyright (C) 1993 Torsten Poulin
*
* 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.
*
* The author can be contacted by s-mail at
* Torsten Poulin
* Banebrinken 99, 2, 77
* DK-2400 Copenhagen NV
* DENMARK
*
* $Id: TestBits.c,v 37.1 93/03/11 17:33:47 Torsten Rel $
* $Log: TestBits.c,v $
* Revision 37.1 93/03/11 17:33:47 Torsten
* Initial revision.
*
*/
#include <exec/types.h>
#include <exec/memory.h>
#include <dos/dos.h>
#include <dos/dosasl.h>
#include <clib/dos_protos.h>
#include <clib/exec_protos.h>
#ifdef __SASC
#include <pragmas/dos_pragmas.h>
#include <pragmas/exec_pragmas.h>
#endif
#include "tastlib.h"
#include "testbits_rev.h"
#define PROGNAME "TestBits"
#define TEMPLATE "NAME/A,FLAGS/A"
#define OPT_NAME 0
#define OPT_FLAGS 1
char const versionID[] = VERSTAG;
char const copyright[] = "$COPYRIGHT:Copyright © 1993 Torsten Poulin$";
typedef struct {
struct DosLibrary *DOSBase;
struct FileInfoBlock fib;
} Global;
LONG setbit(UBYTE c, LONG *mask, Global *global);
LONG matchflags(UBYTE *name, UBYTE *flags, Global *global);
LONG entrypoint(VOID)
{
struct DosLibrary *DOSBase;
struct RDArgs *args;
Global *global;
LONG arg[2];
LONG rc = RETURN_OK;
if (!(DOSBase = (struct DosLibrary *) OpenLibrary("dos.library", 37L)))
return RETURN_FAIL;
if (!(global = AllocVec(sizeof(Global), MEMF_PUBLIC | MEMF_CLEAR)))
rc = ERROR_NO_FREE_STORE;
else
{
global->DOSBase = DOSBase;
arg[OPT_NAME] = arg[OPT_FLAGS] = 0L;
if (!(args = ReadArgs(TEMPLATE, arg, NULL)))
rc = RETURN_ERROR;
else
{
rc = matchflags((UBYTE *) arg[OPT_NAME],
(UBYTE *) arg[OPT_FLAGS], global);
FreeArgs(args);
}
FreeVec(global);
}
rc = printErrorMsg(rc, PROGNAME, DOSBase);
CloseLibrary((struct Library *) DOSBase);
return rc;
}
LONG matchflags(UBYTE *name, UBYTE *flags, Global *global)
{
struct DosLibrary *DOSBase = global->DOSBase;
LONG setmask = 0L;
LONG unsetmask = 0L;
LONG bits = 0L;
BPTR lock;
LONG rc = RETURN_OK;
for (; *flags; flags++)
{
if (*flags == '-')
{
if (*++flags)
rc = setbit(*flags, &unsetmask, global);
/* Silently ignore a trailing '-' */
}
else
rc = setbit(*flags, &setmask, global);
}
if (rc == RETURN_OK)
{
if (setmask & unsetmask)
{
MyPrintf(global, "%s: Ambiguous flag specification\n", PROGNAME);
rc = RETURN_ERROR;
}
else
{
if (!(lock = Lock(name, SHARED_LOCK)))
rc = RETURN_ERROR;
else
{
if (!Examine(lock, &global->fib))
{
MyPrintf(global, "%s: Cannot examine \"%s\"\n", PROGNAME, name);
rc = RETURN_ERROR;
}
else
{
bits = global->fib.fib_Protection;
/* Flip the lower 4 bits and get rid of the higher 24... */
bits = (~bits & 0x0000000f) | (bits & 0x000000f0);
rc = ((bits & setmask) == setmask && (bits & unsetmask) == 0L
? RETURN_OK
: RETURN_WARN);
}
UnLock(lock);
}
}
}
return rc;
}
LONG setbit(UBYTE c, LONG *mask, Global *global)
{
c |= 0x20; /* to lower case (ought to be: c = tolower(c); */
switch (c)
{
case 's': *mask |= FIBF_SCRIPT; break;
case 'p': *mask |= FIBF_PURE; break;
case 'a': *mask |= FIBF_ARCHIVE; break;
case 'r': *mask |= FIBF_READ; break;
case 'w': *mask |= FIBF_WRITE; break;
case 'e': *mask |= FIBF_EXECUTE; break;
case 'd': *mask |= FIBF_DELETE; break;
default:
MyPrintf(global, "%s: Unknown protection flag\n", PROGNAME);
return RETURN_ERROR;
}
return RETURN_OK;
}