WebSVN – SvarDOS – Diff – /svarlang.lib/trunk/svarlang.c


/* 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;
  unsigned long hdr;
  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 "SvL\x1a" */
  if ((FREAD(fd, &hdr, 4) != 4) || (hdr != 0x1a4c7653L)) { /* 0x1a4c7653 = 'SvL\x1a' */
    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);
}
 

Rev 1290	Rev 1293
1	`/* This file is part of the svarlang project and is published under the terms`	1	`/* This file is part of the svarlang project and is published under the terms`
2	`* of the MIT license.`	2	`* of the MIT license.`
3	`*`	3	`*`
4	`* Copyright (C) 2021-2023 Mateusz Viste`	4	`* Copyright (C) 2021-2023 Mateusz Viste`
5	`*`	5	`*`
6	`* Permission is hereby granted, free of charge, to any person obtaining a`	6	`* Permission is hereby granted, free of charge, to any person obtaining a`
7	`* copy of this software and associated documentation files (the "Software"),`	7	`* copy of this software and associated documentation files (the "Software"),`
8	`* to deal in the Software without restriction, including without limitation`	8	`* to deal in the Software without restriction, including without limitation`
9	`* the rights to use, copy, modify, merge, publish, distribute, sublicense,`	9	`* the rights to use, copy, modify, merge, publish, distribute, sublicense,`
10	`* and/or sell copies of the Software, and to permit persons to whom the`	10	`* and/or sell copies of the Software, and to permit persons to whom the`
11	`* Software is furnished to do so, subject to the following conditions:`	11	`* Software is furnished to do so, subject to the following conditions:`
12	`*`	12	`*`
13	`* The above copyright notice and this permission notice shall be included in`	13	`* The above copyright notice and this permission notice shall be included in`
14	`* all copies or substantial portions of the Software.`	14	`* all copies or substantial portions of the Software.`
15	`*`	15	`*`
16	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`	16	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`
17	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`	17	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`
18	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`	18	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`
19	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`	19	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`
20	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`	20	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`
21	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER`	21	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER`
22	`* DEALINGS IN THE SOFTWARE.`	22	`* DEALINGS IN THE SOFTWARE.`
23	`*/`	23	`*/`
24		24
25	`/* if WITHSTDIO is enabled, then remap file operations to use the standard`	25	`/* if WITHSTDIO is enabled, then remap file operations to use the standard`
26	`* stdio amenities */`	26	`* stdio amenities */`
27	`#ifdef WITHSTDIO`	27	`#ifdef WITHSTDIO`
28		28
29	`#include <stdio.h> /* FILE, fopen(), fseek(), etc */`	29	`#include <stdio.h> /* FILE, fopen(), fseek(), etc */`
30	`typedef FILE* FHANDLE;`	30	`typedef FILE* FHANDLE;`
31	`#define FOPEN(x) fopen(x, "rb")`	31	`#define FOPEN(x) fopen(x, "rb")`
32	`#define FCLOSE(x) fclose(x)`	32	`#define FCLOSE(x) fclose(x)`
33	`#define FSEEK(f,b) fseek(f,b,SEEK_CUR)`	33	`#define FSEEK(f,b) fseek(f,b,SEEK_CUR)`
34	`#define FREAD(f,t,b) fread(t, 1, b, f)`	34	`#define FREAD(f,t,b) fread(t, 1, b, f)`
35		35
36	`#else`	36	`#else`
37		37
38	`#include <i86.h>`	38	`#include <i86.h>`
39	`typedef unsigned short FHANDLE;`	39	`typedef unsigned short FHANDLE;`
40		40
41	`#endif`	41	`#endif`
42		42
43	`#include <stdlib.h> /* NULL */`	43	`#include <stdlib.h> /* NULL */`
44	`#include <string.h> /* memcmp(), strcpy() */`	44	`#include <string.h> /* memcmp(), strcpy() */`
45		45
46	`#include "svarlang.h"`	46	`#include "svarlang.h"`
47		47
48		48
49	`/* supplied through DEFLANG.C */`	49	`/* supplied through DEFLANG.C */`
50	`extern char svarlang_mem[];`	50	`extern char svarlang_mem[];`
51	`extern unsigned short svarlang_dict[];`	51	`extern unsigned short svarlang_dict[];`
52	`extern const unsigned short svarlang_memsz;`	52	`extern const unsigned short svarlang_memsz;`
53	`extern const unsigned short svarlang_string_count;`	53	`extern const unsigned short svarlang_string_count;`
54		54
55	`const char *svarlang_strid(unsigned short id) {`	55	`const char *svarlang_strid(unsigned short id) {`
56	`size_t left = 0, right = svarlang_string_count - 1, x;`	56	`size_t left = 0, right = svarlang_string_count - 1, x;`
57	`unsigned short v;`	57	`unsigned short v;`
58		58
59	`if (svarlang_string_count == 0) return "";`	59	`if (svarlang_string_count == 0) return "";`
60		60
61	`while (left <= right ) {`	61	`while (left <= right ) {`
62	`x = left + ( (right - left ) >> 2 );`	62	`x = left + ( (right - left ) >> 2 );`
63	`v = svarlang_dict[x * 2];`	63	`v = svarlang_dict[x * 2];`
64	`if ( id == v ) {`	64	`if ( id == v ) {`
65	`return svarlang_mem + svarlang_dict[x * 2 + 1];`	65	`return svarlang_mem + svarlang_dict[x * 2 + 1];`
66	`}`	66	`}`
67	`else if ( id > v ) left = x + 1;`	67	`else if ( id > v ) left = x + 1;`
68	`else right = x - 1;`	68	`else right = x - 1;`
69	`}`	69	`}`
70	`return "";`	70	`return "";`
71	`}`	71	`}`
72		72
-		73
73	`/* routines below are simplified (dos-based) versions of the libc FILE-related`	74	`/* routines below are simplified (dos-based) versions of the libc FILE-related`
74	`* functions. Using them avoids a dependency on FILE, hence makes the binary`	75	`* functions. Using them avoids a dependency on FILE, hence makes the binary`
75	`* smaller if the application does not need to pull fopen() and friends */`	76	`* smaller if the application does not need to pull fopen() and friends */`
76	`#ifndef WITHSTDIO`	77	`#ifndef WITHSTDIO`
77	`static unsigned short FOPEN(const char *s) {`	78	`static unsigned short FOPEN(const char *s) {`
78	`unsigned short fname_seg = FP_SEG(s);`	79	`unsigned short fname_seg = FP_SEG(s);`
79	`unsigned short fname_off = FP_OFF(s);`	80	`unsigned short fname_off = FP_OFF(s);`
80	`unsigned short res = 0; /* fd 0 is already used by stdout so it's a good error value */`	81	`unsigned short res = 0; /* fd 0 is already used by stdout so it's a good error value */`
81	`_asm {`	82	`_asm {`
82	`push dx`	83	`push dx`
83	`push ds`	84	`push ds`
84		85
85	`mov ax, fname_seg`	86	`mov ax, fname_seg`
86	`mov dx, fname_off`	87	`mov dx, fname_off`
87	`mov ds, ax`	88	`mov ds, ax`
88	`mov ax, 0x3d00 /* open file, read-only (fname at DS:DX) */`	89	`mov ax, 0x3d00 /* open file, read-only (fname at DS:DX) */`
89	`int 0x21`	90	`int 0x21`
90	`pop ds`	91	`pop ds`
91	`jc ERR`	92	`jc ERR`
92	`mov res, ax`	93	`mov res, ax`
93		94
94	`ERR:`	95	`ERR:`
95	`pop dx`	96	`pop dx`
96	`}`	97	`}`
97		98
98	`return(res);`	99	`return(res);`
99	`}`	100	`}`
100		101
101		102
102	`static void FCLOSE(unsigned short handle) {`	103	`static void FCLOSE(unsigned short handle) {`
103	`_asm {`	104	`_asm {`
104	`push bx`	105	`push bx`
105		106
106	`mov ah, 0x3e`	107	`mov ah, 0x3e`
107	`mov bx, handle`	108	`mov bx, handle`
108	`int 0x21`	109	`int 0x21`
109		110
110	`pop bx`	111	`pop bx`
111	`}`	112	`}`
112	`}`	113	`}`
113		114
114		115
115	`static unsigned short FREAD(unsigned short handle, void *buff, unsigned short bytes) {`	116	`static unsigned short FREAD(unsigned short handle, void *buff, unsigned short bytes) {`
116	`unsigned short buff_seg = FP_SEG(buff);`	117	`unsigned short buff_seg = FP_SEG(buff);`
117	`unsigned short buff_off = FP_OFF(buff);`	118	`unsigned short buff_off = FP_OFF(buff);`
118	`unsigned short res = 0;`	119	`unsigned short res = 0;`
119		120
120	`_asm {`	121	`_asm {`
121	`push bx`	122	`push bx`
122	`push cx`	123	`push cx`
123	`push dx`	124	`push dx`
124		125
125	`mov bx, handle`	126	`mov bx, handle`
126	`mov cx, bytes`	127	`mov cx, bytes`
127	`mov dx, buff_off`	128	`mov dx, buff_off`
128	`mov ax, buff_seg`	129	`mov ax, buff_seg`
129	`push ds`	130	`push ds`
130	`mov ds, ax`	131	`mov ds, ax`
131	`mov ah, 0x3f /* read cx bytes from file handle bx to DS:DX */`	132	`mov ah, 0x3f /* read cx bytes from file handle bx to DS:DX */`
132	`int 0x21`	133	`int 0x21`
133	`pop ds`	134	`pop ds`
134	`jc ERR`	135	`jc ERR`
135		136
136	`mov res, ax`	137	`mov res, ax`
137	`ERR:`	138	`ERR:`
138		139
139	`pop dx`	140	`pop dx`
140	`pop cx`	141	`pop cx`
141	`pop bx`	142	`pop bx`
142	`}`	143	`}`
143		144
144	`return(res);`	145	`return(res);`
145	`}`	146	`}`
146		147
147		148
148	`static void FSEEK(unsigned short handle, unsigned short bytes) {`	149	`static void FSEEK(unsigned short handle, unsigned short bytes) {`
149	`_asm {`	150	`_asm {`
150	`push bx`	151	`push bx`
151	`push cx`	152	`push cx`
152	`push dx`	153	`push dx`
153		154
154	`mov ax, 0x4201 /* move file pointer from cur pos + CX:DX */`	155	`mov ax, 0x4201 /* move file pointer from cur pos + CX:DX */`
155	`mov bx, handle`	156	`mov bx, handle`
156	`xor cx, cx`	157	`xor cx, cx`
157	`mov dx, bytes`	158	`mov dx, bytes`
158	`int 0x21`	159	`int 0x21`
159		160
160	`pop dx`	161	`pop dx`
161	`pop cx`	162	`pop cx`
162	`pop bx`	163	`pop bx`
163	`}`	164	`}`
164	`}`	165	`}`
165	`#endif`	166	`#endif`
166		167
-		168
167	`int svarlang_load(const char fname, const char lang) {`	169	`int svarlang_load(const char fname, const char lang) {`
168	`unsigned short langid;`	170	`unsigned short langid;`
169	`char hdr[5];`	171	`unsigned long hdr;`
170	`unsigned short buff16[2];`	172	`unsigned short buff16[2];`
171	`FHANDLE fd;`	173	`FHANDLE fd;`
172	`unsigned short string_count;`	174	`unsigned short string_count;`
173		175
174	`langid = ((unsigned short )lang);`	176	`langid = ((unsigned short )lang);`
175	`langid &= 0xDFDF; /* make sure lang is upcase */`	177	`langid &= 0xDFDF; /* make sure lang is upcase */`
176		178
177	`fd = FOPEN(fname);`	179	`fd = FOPEN(fname);`
178	`if (!fd) return(-1);`	180	`if (!fd) return(-1);`
179		181
180	`/* read hdr, should be "SvL1\x1a" */`	182	`/* read hdr, should be "SvL\x1a" */`
181	`if ((FREAD(fd, hdr, 5) != 5) \|\| (memcmp(hdr, "SvL1\x1a", 5) != 0)) {`	183	`if ((FREAD(fd, &hdr, 4) != 4) \|\| (hdr != 0x1a4c7653L)) { /* 0x1a4c7653 = 'SvL\x1a' */`
182	`FCLOSE(fd);`	184	`FCLOSE(fd);`
183	`return(-3);`	185	`return(-3);`
184	`}`	186	`}`
185		187
186	`/* read string count */`	188	`/* read string count */`
187	`if ((FREAD(fd, &string_count, 2) != 2) \|\| (string_count != svarlang_string_count)) {`	189	`if ((FREAD(fd, &string_count, 2) != 2) \|\| (string_count != svarlang_string_count)) {`
188	`FCLOSE(fd);`	190	`FCLOSE(fd);`
189	`return(-6);`	191	`return(-6);`
190	`}`	192	`}`
191		193
192	`/* read next lang id and string table size in file */`	194	`/* read next lang id and string table size in file */`
193	`while (FREAD(fd, buff16, 4) == 4) {`	195	`while (FREAD(fd, buff16, 4) == 4) {`
194		196
195	`/* is it the lang I am looking for? */`	197	`/* is it the lang I am looking for? */`
196	`if (buff16[0] != langid) { /* skip to next lang */`	198	`if (buff16[0] != langid) { /* skip to next lang */`
197	`FSEEK(fd, svarlang_string_count * 4);`	199	`FSEEK(fd, svarlang_string_count * 4);`
198	`FSEEK(fd, buff16[1]);`	200	`FSEEK(fd, buff16[1]);`
199	`continue;`	201	`continue;`
200	`}`	202	`}`
201		203
202	`/* found - but do I have enough memory space? */`	204	`/* found - but do I have enough memory space? */`
203	`if (buff16[1] >= svarlang_memsz) {`	205	`if (buff16[1] >= svarlang_memsz) {`
204	`FCLOSE(fd);`	206	`FCLOSE(fd);`
205	`return(-4);`	207	`return(-4);`
206	`}`	208	`}`
207		209
208	`/* load dictionary & strings */`	210	`/* load dictionary & strings */`
209	`if ((FREAD(fd, svarlang_dict, svarlang_string_count * 4) != svarlang_string_count * 4) \|\|`	211	`if ((FREAD(fd, svarlang_dict, svarlang_string_count * 4) != svarlang_string_count * 4) \|\|`
210	`(FREAD(fd, svarlang_mem, buff16[1]) != buff16[1])) {`	212	`(FREAD(fd, svarlang_mem, buff16[1]) != buff16[1])) {`
211	`FCLOSE(fd);`	213	`FCLOSE(fd);`
212	`return -7;`	214	`return -7;`
213	`}`	215	`}`
214	`FCLOSE(fd);`	216	`FCLOSE(fd);`
215	`return(0);`	217	`return(0);`
216	`}`	218	`}`
217		219
218	`FCLOSE(fd);`	220	`FCLOSE(fd);`
219	`return(-5);`	221	`return(-5);`
220	`}`	222	`}`
221		223

Subversion Repositories SvarDOS

(root)/svarlang.lib/trunk/svarlang.c – Rev 1290 → 1293