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/* This file is part of the svarlang project and is published under the terms
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* of the MIT license.
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*
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* Copyright (C) 2021-2023 Mateusz Viste
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <stdlib.h> /* _psp */
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#include <string.h> /* _fmemcpy() */
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#include <i86.h> /* MK_FP() */
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#include "svarlang.h"
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int svarlang_autoload_exepath(const char *lang) {
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unsigned short far *psp_envseg = MK_FP(_psp, 0x2c); /* pointer to my env segment field in the PSP */
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char far *myenv = MK_FP(*psp_envseg, 0);
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unsigned short len;
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char orig_ext[3];
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int res;
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/* who am i? look into my own environment, at the end of it should be my EXEPATH string */
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while (*myenv != 0) {
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/* consume a NULL-terminated string */
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while (*myenv != 0) myenv++;
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/* move to next string */
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myenv++;
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}
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myenv++; /* skip the nul terminator */
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/* check next word, if 1 then EXEPATH follows */
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if (*myenv != 1) return(-1);
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myenv++;
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if (*myenv != 0) return(-1);
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myenv++;
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/* myenv contains my full name, find end of string now */
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for (len = 0; myenv[len] != 0; len++);
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/* must be at least 5 bytes long and 4th char from end must be a dot (like "a.exe") */
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if ((len < 5) || (myenv[len - 4] != '.')) return(-1);
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/* copy extension to buffer and replace it with "lng" */
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orig_ext[0] = myenv[len - 3];
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orig_ext[1] = myenv[len - 2];
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orig_ext[2] = myenv[len - 1];
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myenv[len - 3] = 'L';
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myenv[len - 2] = 'N';
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myenv[len - 1] = 'G';
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/* try loading it now */
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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 */
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/* restore the original filename and quit */
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myenv[len - 3] = orig_ext[0];
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myenv[len - 2] = orig_ext[1];
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myenv[len - 1] = orig_ext[2];
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return(res);
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}
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