1,199 → 1,220 |
/* 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. |
*/ |
|
/* 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> |
typedef unsigned short FHANDLE; |
|
#endif |
|
#include <stdlib.h> /* NULL */ |
#include <string.h> /* memcmp(), strcpy() */ |
|
#include "svarlang.h" |
|
|
/* supplied through DEFLANG.C */ |
extern char svarlang_mem[]; |
extern const unsigned short svarlang_memsz; |
|
|
const char *svarlang_strid(unsigned short id) { |
const char *ptr = svarlang_mem; |
/* find the string id in langblock memory */ |
for (;;) { |
if (((unsigned short *)ptr)[0] == id) return(ptr + 4); |
if (((unsigned short *)ptr)[1] == 0) return(ptr + 2); /* end of strings - return an empty string */ |
ptr += ((unsigned short *)ptr)[1] + 4; |
} |
} |
|
/* 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 */ |
#ifndef WITHSTDIO |
static unsigned short FOPEN(const char *s) { |
unsigned short fname_seg = FP_SEG(s); |
unsigned short fname_off = FP_OFF(s); |
unsigned short res = 0; /* fd 0 is already used by stdout so it's a good error value */ |
_asm { |
push dx |
push ds |
|
mov ax, fname_seg |
mov dx, fname_off |
mov ds, ax |
mov ax, 0x3d00 /* open file, read-only (fname at DS:DX) */ |
int 0x21 |
pop ds |
jc ERR |
mov res, ax |
|
ERR: |
pop dx |
} |
|
return(res); |
} |
|
|
static void FCLOSE(unsigned short handle) { |
_asm { |
push bx |
|
mov ah, 0x3e |
mov bx, handle |
int 0x21 |
|
pop bx |
} |
} |
|
|
static unsigned short FREAD(unsigned short handle, void *buff, unsigned short bytes) { |
unsigned short buff_seg = FP_SEG(buff); |
unsigned short buff_off = FP_OFF(buff); |
unsigned short res = 0; |
|
_asm { |
push bx |
push cx |
push dx |
|
mov bx, handle |
mov cx, bytes |
mov dx, buff_off |
mov ax, buff_seg |
push ds |
mov ds, ax |
mov ah, 0x3f /* read cx bytes from file handle bx to DS:DX */ |
int 0x21 |
pop ds |
jc ERR |
|
mov res, ax |
ERR: |
|
pop dx |
pop cx |
pop bx |
} |
|
return(res); |
} |
|
|
static void FSEEK(unsigned short handle, unsigned short bytes) { |
_asm { |
push bx |
push cx |
push dx |
|
mov ax, 0x4201 /* move file pointer from cur pos + CX:DX */ |
mov bx, handle |
xor cx, cx |
mov dx, bytes |
int 0x21 |
|
pop dx |
pop cx |
pop bx |
} |
} |
#endif |
|
int svarlang_load(const char *fname, const char *lang) { |
unsigned short langid; |
char hdr[4]; |
unsigned short buff16[2]; |
FHANDLE fd; |
|
langid = *((unsigned short *)lang); |
langid &= 0xDFDF; /* make sure lang is upcase */ |
|
fd = FOPEN(fname); |
if (!fd) return(-1); |
|
/* read hdr, should be "SvL\33" */ |
if ((FREAD(fd, hdr, 4) != 4) || (memcmp(hdr, "SvL\33", 4) != 0)) { |
FCLOSE(fd); |
return(-3); |
} |
|
/* read next lang id in file */ |
while (FREAD(fd, buff16, 4) == 4) { |
|
/* is it the lang I am looking for? */ |
if (buff16[0] != langid) { /* skip to next lang */ |
FSEEK(fd, buff16[1]); |
continue; |
} |
|
/* found - but do I have enough memory space? */ |
if (buff16[1] >= svarlang_memsz) { |
FCLOSE(fd); |
return(-4); |
} |
|
/* load strings */ |
if (FREAD(fd, svarlang_mem, buff16[1]) != buff16[1]) break; |
FCLOSE(fd); |
return(0); |
} |
|
FCLOSE(fd); |
return(-5); |
} |
/* 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. |
*/ |
|
/* 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> |
typedef unsigned short FHANDLE; |
|
#endif |
|
#include <stdlib.h> /* NULL */ |
#include <string.h> /* memcmp(), strcpy() */ |
|
#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) { |
size_t 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]; |
} |
else 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 */ |
#ifndef WITHSTDIO |
static unsigned short FOPEN(const char *s) { |
unsigned short fname_seg = FP_SEG(s); |
unsigned short fname_off = FP_OFF(s); |
unsigned short res = 0; /* fd 0 is already used by stdout so it's a good error value */ |
_asm { |
push dx |
push ds |
|
mov ax, fname_seg |
mov dx, fname_off |
mov ds, ax |
mov ax, 0x3d00 /* open file, read-only (fname at DS:DX) */ |
int 0x21 |
pop ds |
jc ERR |
mov res, ax |
|
ERR: |
pop dx |
} |
|
return(res); |
} |
|
|
static void FCLOSE(unsigned short handle) { |
_asm { |
push bx |
|
mov ah, 0x3e |
mov bx, handle |
int 0x21 |
|
pop bx |
} |
} |
|
|
static unsigned short FREAD(unsigned short handle, void *buff, unsigned short bytes) { |
unsigned short buff_seg = FP_SEG(buff); |
unsigned short buff_off = FP_OFF(buff); |
unsigned short res = 0; |
|
_asm { |
push bx |
push cx |
push dx |
|
mov bx, handle |
mov cx, bytes |
mov dx, buff_off |
mov ax, buff_seg |
push ds |
mov ds, ax |
mov ah, 0x3f /* read cx bytes from file handle bx to DS:DX */ |
int 0x21 |
pop ds |
jc ERR |
|
mov res, ax |
ERR: |
|
pop dx |
pop cx |
pop bx |
} |
|
return(res); |
} |
|
|
static void FSEEK(unsigned short handle, unsigned short bytes) { |
_asm { |
push bx |
push cx |
push dx |
|
mov ax, 0x4201 /* move file pointer from cur pos + CX:DX */ |
mov bx, handle |
xor cx, cx |
mov dx, bytes |
int 0x21 |
|
pop dx |
pop cx |
pop bx |
} |
} |
#endif |
|
int svarlang_load(const char *fname, const char *lang) { |
unsigned short langid; |
char hdr[5]; |
unsigned short buff16[2]; |
FHANDLE fd; |
unsigned short string_count; |
|
langid = *((unsigned short *)lang); |
langid &= 0xDFDF; /* make sure lang is upcase */ |
|
fd = FOPEN(fname); |
if (!fd) return(-1); |
|
/* read hdr, should be "SvL1\x1a" */ |
if ((FREAD(fd, hdr, 5) != 5) || (memcmp(hdr, "SvL1\x1a", 5) != 0)) { |
FCLOSE(fd); |
return(-3); |
} |
|
/* read string count */ |
if ((FREAD(fd, &string_count, 2) != 2) || (string_count != svarlang_string_count)) { |
FCLOSE(fd); |
return(-6); |
} |
|
/* read next lang id and string table size in file */ |
while (FREAD(fd, buff16, 4) == 4) { |
|
/* is it the lang I am looking for? */ |
if (buff16[0] != langid) { /* skip to next lang */ |
FSEEK(fd, svarlang_string_count * 4); |
FSEEK(fd, buff16[1]); |
continue; |
} |
|
/* found - but do I have enough memory space? */ |
if (buff16[1] >= svarlang_memsz) { |
FCLOSE(fd); |
return(-4); |
} |
|
/* load dictionary & strings */ |
if ((FREAD(fd, svarlang_dict, svarlang_string_count * 4) != svarlang_string_count * 4) || |
(FREAD(fd, svarlang_mem, buff16[1]) != buff16[1])) { |
FCLOSE(fd); |
return -7; |
} |
FCLOSE(fd); |
return(0); |
} |
|
FCLOSE(fd); |
return(-5); |
} |