| 0,0 → 1,77 |
|---|
| /* This file is part of the svarlang project and is published under the terms |
| * of the MIT license. |
| * |
| * Copyright (C) 2021-2023 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 <stdlib.h> /* _psp */ |
| #include <string.h> /* _fmemcpy() */ |
| #include <i86.h> /* MK_FP() */ |
| |
| #include "svarlang.h" |
| |
| int svarlang_autoload_exepath(const char *lang) { |
| unsigned short far *psp_envseg = MK_FP(_psp, 0x2c); /* pointer to my env segment field in the PSP */ |
| char far *myenv = MK_FP(*psp_envseg, 0); |
| unsigned short len; |
| char orig_ext[3]; |
| int res; |
| |
| /* who am i? look into my own environment, at the end of it should be my EXEPATH string */ |
| while (*myenv != 0) { |
| /* consume a NULL-terminated string */ |
| while (*myenv != 0) myenv++; |
| /* move to next string */ |
| myenv++; |
| } |
| myenv++; /* skip the nul terminator */ |
| |
| /* check next word, if 1 then EXEPATH follows */ |
| if (*myenv != 1) return(-1); |
| myenv++; |
| if (*myenv != 0) return(-1); |
| myenv++; |
| |
| /* myenv contains my full name, find end of string now */ |
| for (len = 0; myenv[len] != 0; len++); |
| |
| /* must be at least 5 bytes long and 4th char from end must be a dot (like "a.exe") */ |
| if ((len < 5) || (myenv[len - 4] != '.')) return(-1); |
| |
| /* copy extension to buffer and replace it with "lng" */ |
| orig_ext[0] = myenv[len - 3]; |
| orig_ext[1] = myenv[len - 2]; |
| orig_ext[2] = myenv[len - 1]; |
| |
| myenv[len - 3] = 'L'; |
| myenv[len - 2] = 'N'; |
| myenv[len - 1] = 'G'; |
| |
| /* try loading it now */ |
| res = svarlang_load(myenv, lang); /* TODO FIXME myenv is a far pointer, while svarlang_load() in small or medium memory models expects a near ptr */ |
| |
| /* restore the original filename and quit */ |
| myenv[len - 3] = orig_ext[0]; |
| myenv[len - 2] = orig_ext[1]; |
| myenv[len - 1] = orig_ext[2]; |
| |
| return(res); |
| } |