| 0,0 → 1,184 |
|---|
| /* This file is part of the svarlang project and is published under the terms |
| * of the MIT license. |
| * |
| * Copyright (C) 2021-2024 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. |
| */ |
| |
| /* if WITHSTDIO is enabled, then remap file operations to use the standard |
| * stdio amenities */ |
| #ifdef WITHSTDIO |
| |
| #include <stdio.h> /* FILE, fopen(), fseek(), etc */ |
| typedef FILE* FHANDLE; |
| #define FOPEN(x) fopen(x, "rb") |
| #define FCLOSE(x) fclose(x) |
| #define FSEEK(f,b) fseek(f,b,SEEK_CUR) |
| #define FREAD(f,t,b) fread(t, 1, b, f) |
| |
| #else |
| |
| #include <i86.h> /* FP_SEG, FP_OFF */ |
| typedef unsigned short FHANDLE; |
| |
| #endif |
| |
| |
| #include "svarlang.h" |
| |
| |
| /* supplied through DEFLANG.C */ |
| extern char svarlang_mem[]; |
| extern unsigned short svarlang_dict[]; |
| extern const unsigned short svarlang_memsz; |
| extern const unsigned short svarlang_string_count; |
| |
| |
| const char *svarlang_strid(unsigned short id) { |
| unsigned short left = 0, right = svarlang_string_count - 1, x; |
| unsigned short v; |
| |
| if (svarlang_string_count == 0) return(""); |
| |
| while (left <= right) { |
| x = left + ((right - left ) >> 2); |
| v = svarlang_dict[x * 2]; |
| |
| if (id == v) return(svarlang_mem + svarlang_dict[x * 2 + 1]); |
| |
| if (id > v) { |
| left = x + 1; |
| } else { |
| right = x - 1; |
| } |
| } |
| |
| return(""); |
| } |
| |
| |
| /* routines below are simplified (dos-based) versions of the libc FILE-related |
| * functions. Using them avoids a dependency on FILE, hence makes the binary |
| * smaller if the application does not need to pull fopen() and friends |
| * I use pragma aux directives for more compact size. open-watcom only. */ |
| #ifndef WITHSTDIO |
| |
| static unsigned short FOPEN(const char far *s); |
| |
| #pragma aux FOPEN = \ |
| "push ds" \ |
| "push es" \ |
| "pop ds" \ |
| "mov ax, 0x3D00" /* open file, read-only (fname at DS:DX) */ \ |
| "int 0x21" \ |
| "jnc DONE" \ |
| "xor ax, ax" /* return 0 on error */ \ |
| "DONE:" \ |
| "pop ds" \ |
| parm [es dx] \ |
| value [ax]; |
| |
| |
| static void FCLOSE(unsigned short handle); |
| |
| #pragma aux FCLOSE = \ |
| "mov ah, 0x3E" \ |
| "int 0x21" \ |
| modify [ax] /* AX might contain an error code on failure */ \ |
| parm [bx] |
| |
| |
| static unsigned short FREAD(unsigned short handle, void far *buff, unsigned short bytes); |
| |
| #pragma aux FREAD = \ |
| "push ds" \ |
| "push es" \ |
| "pop ds" \ |
| "mov ah, 0x3F" /* read cx bytes from file handle bx to DS:DX */ \ |
| "int 0x21" \ |
| "jnc ERR" \ |
| "xor ax, ax" /* return 0 on error */ \ |
| "ERR:" \ |
| "pop ds" \ |
| parm [bx] [es dx] [cx] \ |
| value [ax] |
| |
| |
| static void FSEEK(unsigned short handle, unsigned short bytes); |
| |
| #pragma aux FSEEK = \ |
| "mov ax, 0x4201" /* move file pointer from cur pos + CX:DX */ \ |
| "xor cx, cx" \ |
| "int 0x21" \ |
| parm [bx] [dx] \ |
| modify [ax cx dx] |
| |
| #endif |
| |
| |
| int svarlang_load(const char *fname, const char *lang) { |
| unsigned short langid; |
| unsigned short buff16[2]; |
| FHANDLE fd; |
| signed char exitcode = 0; |
| struct { |
| unsigned long sig; |
| unsigned short string_count; |
| } hdr; |
| |
| langid = *((unsigned short *)lang); |
| langid &= 0xDFDF; /* make sure lang is upcase */ |
| |
| fd = FOPEN(fname); |
| if (!fd) return(-1); |
| |
| /* read hdr, sig should be "SvL\x1a" (0x1a4c7653) */ |
| if ((FREAD(fd, &hdr, 6) != 6) || (hdr.sig != 0x1a4c7653L) || (hdr.string_count != svarlang_string_count)) { |
| exitcode = -2; |
| goto FCLOSE_AND_EXIT; |
| } |
| |
| for (;;) { |
| /* read next lang id and string table size in file */ |
| if (FREAD(fd, buff16, 4) != 4) { |
| exitcode = -3; |
| goto FCLOSE_AND_EXIT; |
| } |
| |
| /* is it the lang I am looking for? */ |
| if (buff16[0] == langid) break; |
| |
| /* skip to next lang (in two steps to avoid a potential uint16 overflow) */ |
| FSEEK(fd, svarlang_string_count * 4); |
| FSEEK(fd, buff16[1]); |
| } |
| |
| /* load dictionary & strings, but only if I have enough memory space */ |
| if ((buff16[1] >= svarlang_memsz) |
| || (FREAD(fd, svarlang_dict, svarlang_string_count * 4) != svarlang_string_count * 4) |
| || (FREAD(fd, svarlang_mem, buff16[1]) != buff16[1])) { |
| exitcode = -4; |
| } |
| |
| FCLOSE_AND_EXIT: |
| |
| FCLOSE(fd); |
| return(exitcode); |
| } |