| 0,0 → 1,59 |
|---|
| /* This file is part of the SvarCOM project and is published under the terms |
| * of the MIT license. |
| * |
| * Copyright (C) 2021 Mateusz Viste |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| * DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include <i86.h> |
| |
| #include "rmodinit.h" |
| |
| #include "sayonara.h" |
| |
| |
| /* rewires my parent pointer, uninstalls rmod let DOS terminate me, UNLESS |
| * my parent is unknown */ |
| void sayonara(unsigned short rmodseg) { |
| unsigned long far *orgparent = MK_FP(rmodseg, RMOD_OFFSET_ORIGPARENT); |
| unsigned long *myparent = (void *)0x0A; |
| unsigned short far *rmodenv_ptr = MK_FP(rmodseg, RMOD_OFFSET_ENVSEG); |
| unsigned short rmodenv = *rmodenv_ptr; |
| |
| /* set my parent back to original value (if 0 = shell is permanent) */ |
| if (*orgparent == 0) return; |
| *myparent = *orgparent; |
| |
| _asm { |
| /* free RMOD's code segment and env segment */ |
| mov ah, 0x49 /* DOS 2+ -- Free Memory Block */ |
| mov es, [rmodseg] |
| int 0x21 |
| |
| /* free RMOD's env segment */ |
| mov ah, 0x49 /* DOS 2+ -- Free Memory Block */ |
| mov es, [rmodenv] |
| int 0x21 |
| |
| /* gameover */ |
| mov ax, 0x4C00 /* DOS 2+ -- Terminate with exit code 0 */ |
| int 0x21 |
| } |
| } |