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;
  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);
}
 

Rev 1281	Rev 1290
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 const unsigned short svarlang_memsz;`	52	`extern const unsigned short svarlang_memsz;`
52		-
-		53	`extern const unsigned short svarlang_string_count;`
53		54
54	`const char *svarlang_strid(unsigned short id) {`	55	`const char *svarlang_strid(unsigned short id) {`
55	`const char *ptr = svarlang_mem;`	56	`size_t left = 0, right = svarlang_string_count - 1, x;`
-		57	`unsigned short v;`
-		58
56	`/* find the string id in langblock memory */`	59	`if (svarlang_string_count == 0) return "";`
-		60
57	`for (;;) {`	61	`while (left <= right ) {`
58	`if (((unsigned short *)ptr)[0] == id) return(ptr + 4);`	62	`x = left + ( (right - left ) >> 2 );`
59	`if (((unsigned short )ptr)[1] == 0) return(ptr + 2); / end of strings - return an empty string */`	63	`v = svarlang_dict[x * 2];`
-		64	`if ( id == v ) {`
60	`ptr += ((unsigned short *)ptr)[1] + 4;`	65	`return svarlang_mem + svarlang_dict[x * 2 + 1];`
61	`}`	66	`}`
-		67	`else if ( id > v ) left = x + 1;`
-		68	`else right = x - 1;`
-		69	`}`
-		70	`return "";`
62	`}`	71	`}`
63		72
64	`/* routines below are simplified (dos-based) versions of the libc FILE-related`	73	`/* routines below are simplified (dos-based) versions of the libc FILE-related`
65	`* functions. Using them avoids a dependency on FILE, hence makes the binary`	74	`* functions. Using them avoids a dependency on FILE, hence makes the binary`
66	`* smaller if the application does not need to pull fopen() and friends */`	75	`* smaller if the application does not need to pull fopen() and friends */`
67	`#ifndef WITHSTDIO`	76	`#ifndef WITHSTDIO`
68	`static unsigned short FOPEN(const char *s) {`	77	`static unsigned short FOPEN(const char *s) {`
69	`unsigned short fname_seg = FP_SEG(s);`	78	`unsigned short fname_seg = FP_SEG(s);`
70	`unsigned short fname_off = FP_OFF(s);`	79	`unsigned short fname_off = FP_OFF(s);`
71	`unsigned short res = 0; /* fd 0 is already used by stdout so it's a good error value */`	80	`unsigned short res = 0; /* fd 0 is already used by stdout so it's a good error value */`
72	`_asm {`	81	`_asm {`
73	`push dx`	82	`push dx`
74	`push ds`	83	`push ds`
75		84
76	`mov ax, fname_seg`	85	`mov ax, fname_seg`
77	`mov dx, fname_off`	86	`mov dx, fname_off`
78	`mov ds, ax`	87	`mov ds, ax`
79	`mov ax, 0x3d00 /* open file, read-only (fname at DS:DX) */`	88	`mov ax, 0x3d00 /* open file, read-only (fname at DS:DX) */`
80	`int 0x21`	89	`int 0x21`
81	`pop ds`	90	`pop ds`
82	`jc ERR`	91	`jc ERR`
83	`mov res, ax`	92	`mov res, ax`
84		93
85	`ERR:`	94	`ERR:`
86	`pop dx`	95	`pop dx`
87	`}`	96	`}`
88		97
89	`return(res);`	98	`return(res);`
90	`}`	99	`}`
91		100
92		101
93	`static void FCLOSE(unsigned short handle) {`	102	`static void FCLOSE(unsigned short handle) {`
94	`_asm {`	103	`_asm {`
95	`push bx`	104	`push bx`
96		105
97	`mov ah, 0x3e`	106	`mov ah, 0x3e`
98	`mov bx, handle`	107	`mov bx, handle`
99	`int 0x21`	108	`int 0x21`
100		109
101	`pop bx`	110	`pop bx`
102	`}`	111	`}`
103	`}`	112	`}`
104		113
105		114
106	`static unsigned short FREAD(unsigned short handle, void *buff, unsigned short bytes) {`	115	`static unsigned short FREAD(unsigned short handle, void *buff, unsigned short bytes) {`
107	`unsigned short buff_seg = FP_SEG(buff);`	116	`unsigned short buff_seg = FP_SEG(buff);`
108	`unsigned short buff_off = FP_OFF(buff);`	117	`unsigned short buff_off = FP_OFF(buff);`
109	`unsigned short res = 0;`	118	`unsigned short res = 0;`
110		119
111	`_asm {`	120	`_asm {`
112	`push bx`	121	`push bx`
113	`push cx`	122	`push cx`
114	`push dx`	123	`push dx`
115		124
116	`mov bx, handle`	125	`mov bx, handle`
117	`mov cx, bytes`	126	`mov cx, bytes`
118	`mov dx, buff_off`	127	`mov dx, buff_off`
119	`mov ax, buff_seg`	128	`mov ax, buff_seg`
120	`push ds`	129	`push ds`
121	`mov ds, ax`	130	`mov ds, ax`
122	`mov ah, 0x3f /* read cx bytes from file handle bx to DS:DX */`	131	`mov ah, 0x3f /* read cx bytes from file handle bx to DS:DX */`
123	`int 0x21`	132	`int 0x21`
124	`pop ds`	133	`pop ds`
125	`jc ERR`	134	`jc ERR`
126		135
127	`mov res, ax`	136	`mov res, ax`
128	`ERR:`	137	`ERR:`
129		138
130	`pop dx`	139	`pop dx`
131	`pop cx`	140	`pop cx`
132	`pop bx`	141	`pop bx`
133	`}`	142	`}`
134		143
135	`return(res);`	144	`return(res);`
136	`}`	145	`}`
137		146
138		147
139	`static void FSEEK(unsigned short handle, unsigned short bytes) {`	148	`static void FSEEK(unsigned short handle, unsigned short bytes) {`
140	`_asm {`	149	`_asm {`
141	`push bx`	150	`push bx`
142	`push cx`	151	`push cx`
143	`push dx`	152	`push dx`
144		153
145	`mov ax, 0x4201 /* move file pointer from cur pos + CX:DX */`	154	`mov ax, 0x4201 /* move file pointer from cur pos + CX:DX */`
146	`mov bx, handle`	155	`mov bx, handle`
147	`xor cx, cx`	156	`xor cx, cx`
148	`mov dx, bytes`	157	`mov dx, bytes`
149	`int 0x21`	158	`int 0x21`
150		159
151	`pop dx`	160	`pop dx`
152	`pop cx`	161	`pop cx`
153	`pop bx`	162	`pop bx`
154	`}`	163	`}`
155	`}`	164	`}`
156	`#endif`	165	`#endif`
157		166
158	`int svarlang_load(const char fname, const char lang) {`	167	`int svarlang_load(const char fname, const char lang) {`
159	`unsigned short langid;`	168	`unsigned short langid;`
160	`char hdr[4];`	169	`char hdr[5];`
161	`unsigned short buff16[2];`	170	`unsigned short buff16[2];`
162	`FHANDLE fd;`	171	`FHANDLE fd;`
-		172	`unsigned short string_count;`
163		173
164	`langid = ((unsigned short )lang);`	174	`langid = ((unsigned short )lang);`
165	`langid &= 0xDFDF; /* make sure lang is upcase */`	175	`langid &= 0xDFDF; /* make sure lang is upcase */`
166		176
167	`fd = FOPEN(fname);`	177	`fd = FOPEN(fname);`
168	`if (!fd) return(-1);`	178	`if (!fd) return(-1);`
169		179
170	`/* read hdr, should be "SvL\33" */`	180	`/* read hdr, should be "SvL1\x1a" */`
171	`if ((FREAD(fd, hdr, 4) != 4) \|\| (memcmp(hdr, "SvL\33", 4) != 0)) {`	181	`if ((FREAD(fd, hdr, 5) != 5) \|\| (memcmp(hdr, "SvL1\x1a", 5) != 0)) {`
172	`FCLOSE(fd);`	182	`FCLOSE(fd);`
173	`return(-3);`	183	`return(-3);`
174	`}`	184	`}`
175		185
-		186	`/* read string count */`
-		187	`if ((FREAD(fd, &string_count, 2) != 2) \|\| (string_count != svarlang_string_count)) {`
-		188	`FCLOSE(fd);`
-		189	`return(-6);`
-		190	`}`
-		191
176	`/* read next lang id in file */`	192	`/* read next lang id and string table size in file */`
177	`while (FREAD(fd, buff16, 4) == 4) {`	193	`while (FREAD(fd, buff16, 4) == 4) {`
178		194
179	`/* is it the lang I am looking for? */`	195	`/* is it the lang I am looking for? */`
180	`if (buff16[0] != langid) { /* skip to next lang */`	196	`if (buff16[0] != langid) { /* skip to next lang */`
-		197	`FSEEK(fd, svarlang_string_count * 4);`
181	`FSEEK(fd, buff16[1]);`	198	`FSEEK(fd, buff16[1]);`
182	`continue;`	199	`continue;`
183	`}`	200	`}`
184		201
185	`/* found - but do I have enough memory space? */`	202	`/* found - but do I have enough memory space? */`
186	`if (buff16[1] >= svarlang_memsz) {`	203	`if (buff16[1] >= svarlang_memsz) {`
187	`FCLOSE(fd);`	204	`FCLOSE(fd);`
188	`return(-4);`	205	`return(-4);`
189	`}`	206	`}`
190		207
191	`/* load strings */`	208	`/* load dictionary & strings */`
-		209	`if ((FREAD(fd, svarlang_dict, svarlang_string_count * 4) != svarlang_string_count * 4) \|\|`
192	`if (FREAD(fd, svarlang_mem, buff16[1]) != buff16[1]) break;`	210	`(FREAD(fd, svarlang_mem, buff16[1]) != buff16[1])) {`
-		211	`FCLOSE(fd);`
-		212	`return -7;`
-		213	`}`
193	`FCLOSE(fd);`	214	`FCLOSE(fd);`
194	`return(0);`	215	`return(0);`
195	`}`	216	`}`
196		217
197	`FCLOSE(fd);`	218	`FCLOSE(fd);`
198	`return(-5);`	219	`return(-5);`
199	`}`	220	`}`
200		221

Subversion Repositories SvarDOS

(root)/svarlang.lib/trunk/svarlang.c – Rev 1281 → 1290