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>  /* 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 */
#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 {
 
 
    mov ah, 0x3e
    mov bx, handle
    int 0x21
 
 
  }
}
 
 
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 {
 
 
 
 
    mov ax, 0x4201  /* move file pointer from cur pos + CX:DX */
    mov bx, handle
    xor cx, cx
    mov dx, bytes
    int 0x21
 
 
 
 
  }
}
#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);
}
 

Rev 1376	Rev 1377
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> /* FP_SEG, FP_OFF */`	38	`#include <i86.h> /* FP_SEG, FP_OFF */`
39	`typedef unsigned short FHANDLE;`	39	`typedef unsigned short FHANDLE;`
40		40
41	`#endif`	41	`#endif`
42		42
43		43
44	`#include "svarlang.h"`	44	`#include "svarlang.h"`
45		45
46		46
47	`/* supplied through DEFLANG.C */`	47	`/* supplied through DEFLANG.C */`
48	`extern char svarlang_mem[];`	48	`extern char svarlang_mem[];`
49	`extern unsigned short svarlang_dict[];`	49	`extern unsigned short svarlang_dict[];`
50	`extern const unsigned short svarlang_memsz;`	50	`extern const unsigned short svarlang_memsz;`
51	`extern const unsigned short svarlang_string_count;`	51	`extern const unsigned short svarlang_string_count;`
52		52
53		53
54	`const char *svarlang_strid(unsigned short id) {`	54	`const char *svarlang_strid(unsigned short id) {`
55	`unsigned short left = 0, right = svarlang_string_count - 1, x;`	55	`unsigned short left = 0, right = svarlang_string_count - 1, x;`
56	`unsigned short v;`	56	`unsigned short v;`
57		57
58	`if (svarlang_string_count == 0) return("");`	58	`if (svarlang_string_count == 0) return("");`
59		59
60	`while (left <= right) {`	60	`while (left <= right) {`
61	`x = left + ((right - left ) >> 2);`	61	`x = left + ((right - left ) >> 2);`
62	`v = svarlang_dict[x * 2];`	62	`v = svarlang_dict[x * 2];`
63		63
64	`if (id == v) return(svarlang_mem + svarlang_dict[x * 2 + 1]);`	64	`if (id == v) return(svarlang_mem + svarlang_dict[x * 2 + 1]);`
65		65
66	`if (id > v) {`	66	`if (id > v) {`
67	`left = x + 1;`	67	`left = x + 1;`
68	`} else {`	68	`} else {`
69	`right = x - 1;`	69	`right = x - 1;`
70	`}`	70	`}`
71	`}`	71	`}`
72		72
73	`return("");`	73	`return("");`
74	`}`	74	`}`
75		75
76		76
77	`/* routines below are simplified (dos-based) versions of the libc FILE-related`	77	`/* routines below are simplified (dos-based) versions of the libc FILE-related`
78	`* functions. Using them avoids a dependency on FILE, hence makes the binary`	78	`* functions. Using them avoids a dependency on FILE, hence makes the binary`
79	`* smaller if the application does not need to pull fopen() and friends */`	79	`* smaller if the application does not need to pull fopen() and friends */`
80	`#ifndef WITHSTDIO`	80	`#ifndef WITHSTDIO`
81	`static unsigned short FOPEN(const char *s) {`	81	`static unsigned short FOPEN(const char *s) {`
82	`unsigned short fname_seg = FP_SEG(s);`	82	`unsigned short fname_seg = FP_SEG(s);`
83	`unsigned short fname_off = FP_OFF(s);`	83	`unsigned short fname_off = FP_OFF(s);`
84	`unsigned short res = 0; /* fd 0 is already used by stdout so it's a good error value */`	84	`unsigned short res = 0; /* fd 0 is already used by stdout so it's a good error value */`
85	`_asm {`	85	`_asm {`
86	`push dx`	86	`push dx`
87	`push ds`	87	`push ds`
88		88
89	`mov ax, fname_seg`	89	`mov ax, fname_seg`
90	`mov dx, fname_off`	90	`mov dx, fname_off`
91	`mov ds, ax`	91	`mov ds, ax`
92	`mov ax, 0x3d00 /* open file, read-only (fname at DS:DX) */`	92	`mov ax, 0x3d00 /* open file, read-only (fname at DS:DX) */`
93	`int 0x21`	93	`int 0x21`
94	`pop ds`	94	`pop ds`
95	`jc ERR`	95	`jc ERR`
96	`mov res, ax`	96	`mov res, ax`
97		97
98	`ERR:`	98	`ERR:`
99	`pop dx`	99	`pop dx`
100	`}`	100	`}`
101		101
102	`return(res);`	102	`return(res);`
103	`}`	103	`}`
104		104
105		105
106	`static void FCLOSE(unsigned short handle) {`	106	`static void FCLOSE(unsigned short handle) {`
107	`_asm {`	107	`_asm {`
108	`push bx`	-
109		-
110	`mov ah, 0x3e`	108	`mov ah, 0x3e`
111	`mov bx, handle`	109	`mov bx, handle`
112	`int 0x21`	110	`int 0x21`
113		-
114	`pop bx`	-
115	`}`	111	`}`
116	`}`	112	`}`
117		113
118		114
119	`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) {`
120	`unsigned short buff_seg = FP_SEG(buff);`	116	`unsigned short buff_seg = FP_SEG(buff);`
121	`unsigned short buff_off = FP_OFF(buff);`	117	`unsigned short buff_off = FP_OFF(buff);`
122	`unsigned short res = 0;`	118	`unsigned short res = 0;`
123		119
124	`_asm {`	120	`_asm {`
125	`push bx`	121	`push bx`
126	`push cx`	122	`push cx`
127	`push dx`	123	`push dx`
128		124
129	`mov bx, handle`	125	`mov bx, handle`
130	`mov cx, bytes`	126	`mov cx, bytes`
131	`mov dx, buff_off`	127	`mov dx, buff_off`
132	`mov ax, buff_seg`	128	`mov ax, buff_seg`
133	`push ds`	129	`push ds`
134	`mov ds, ax`	130	`mov ds, ax`
135	`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 */`
136	`int 0x21`	132	`int 0x21`
137	`pop ds`	133	`pop ds`
138	`jc ERR`	134	`jc ERR`
139		135
140	`mov res, ax`	136	`mov res, ax`
141	`ERR:`	137	`ERR:`
142		138
143	`pop dx`	139	`pop dx`
144	`pop cx`	140	`pop cx`
145	`pop bx`	141	`pop bx`
146	`}`	142	`}`
147		143
148	`return(res);`	144	`return(res);`
149	`}`	145	`}`
150		146
151		147
152	`static void FSEEK(unsigned short handle, unsigned short bytes) {`	148	`static void FSEEK(unsigned short handle, unsigned short bytes) {`
153	`_asm {`	149	`_asm {`
154	`push bx`	-
155	`push cx`	-
156	`push dx`	-
157		-
158	`mov ax, 0x4201 /* move file pointer from cur pos + CX:DX */`	150	`mov ax, 0x4201 /* move file pointer from cur pos + CX:DX */`
159	`mov bx, handle`	151	`mov bx, handle`
160	`xor cx, cx`	152	`xor cx, cx`
161	`mov dx, bytes`	153	`mov dx, bytes`
162	`int 0x21`	154	`int 0x21`
163		-
164	`pop dx`	-
165	`pop cx`	-
166	`pop bx`	-
167	`}`	155	`}`
168	`}`	156	`}`
169	`#endif`	157	`#endif`
170		158
171		159
172	`int svarlang_load(const char fname, const char lang) {`	160	`int svarlang_load(const char fname, const char lang) {`
173	`unsigned short langid;`	161	`unsigned short langid;`
174	`unsigned short buff16[2];`	162	`unsigned short buff16[2];`
175	`FHANDLE fd;`	163	`FHANDLE fd;`
176	`signed char exitcode = 0;`	164	`signed char exitcode = 0;`
177	`struct {`	165	`struct {`
178	`unsigned long sig;`	166	`unsigned long sig;`
179	`unsigned short string_count;`	167	`unsigned short string_count;`
180	`} hdr;`	168	`} hdr;`
181		169
182	`langid = ((unsigned short )lang);`	170	`langid = ((unsigned short )lang);`
183	`langid &= 0xDFDF; /* make sure lang is upcase */`	171	`langid &= 0xDFDF; /* make sure lang is upcase */`
184		172
185	`fd = FOPEN(fname);`	173	`fd = FOPEN(fname);`
186	`if (!fd) return(-1);`	174	`if (!fd) return(-1);`
187		175
188	`/* read hdr, sig should be "SvL\x1a" (0x1a4c7653) */`	176	`/* read hdr, sig should be "SvL\x1a" (0x1a4c7653) */`
189	`if ((FREAD(fd, &hdr, 6) != 6) \|\| (hdr.sig != 0x1a4c7653L) \|\| (hdr.string_count != svarlang_string_count)) {`	177	`if ((FREAD(fd, &hdr, 6) != 6) \|\| (hdr.sig != 0x1a4c7653L) \|\| (hdr.string_count != svarlang_string_count)) {`
190	`exitcode = -2;`	178	`exitcode = -2;`
191	`goto FCLOSE_AND_EXIT;`	179	`goto FCLOSE_AND_EXIT;`
192	`}`	180	`}`
193		181
194	`for (;;) {`	182	`for (;;) {`
195	`/* read next lang id and string table size in file */`	183	`/* read next lang id and string table size in file */`
196	`if (FREAD(fd, buff16, 4) != 4) {`	184	`if (FREAD(fd, buff16, 4) != 4) {`
197	`exitcode = -3;`	185	`exitcode = -3;`
198	`goto FCLOSE_AND_EXIT;`	186	`goto FCLOSE_AND_EXIT;`
199	`}`	187	`}`
200		188
201	`/* is it the lang I am looking for? */`	189	`/* is it the lang I am looking for? */`
202	`if (buff16[0] == langid) break;`	190	`if (buff16[0] == langid) break;`
203		191
204	`/* skip to next lang (in two steps to avoid a potential uint16 overflow) */`	192	`/* skip to next lang (in two steps to avoid a potential uint16 overflow) */`
205	`FSEEK(fd, svarlang_string_count * 4);`	193	`FSEEK(fd, svarlang_string_count * 4);`
206	`FSEEK(fd, buff16[1]);`	194	`FSEEK(fd, buff16[1]);`
207	`}`	195	`}`
208		196
209	`/* load dictionary & strings, but only if I have enough memory space */`	197	`/* load dictionary & strings, but only if I have enough memory space */`
210	`if ((buff16[1] >= svarlang_memsz)`	198	`if ((buff16[1] >= svarlang_memsz)`
211	`\|\| (FREAD(fd, svarlang_dict, svarlang_string_count * 4) != svarlang_string_count * 4)`	199	`\|\| (FREAD(fd, svarlang_dict, svarlang_string_count * 4) != svarlang_string_count * 4)`
212	`\|\| (FREAD(fd, svarlang_mem, buff16[1]) != buff16[1])) {`	200	`\|\| (FREAD(fd, svarlang_mem, buff16[1]) != buff16[1])) {`
213	`exitcode = -4;`	201	`exitcode = -4;`
214	`}`	202	`}`
215		203
216	`FCLOSE_AND_EXIT:`	204	`FCLOSE_AND_EXIT:`
217		205
218	`FCLOSE(fd);`	206	`FCLOSE(fd);`
219	`return(exitcode);`	207	`return(exitcode);`
220	`}`	208	`}`
221		209

Subversion Repositories SvarDOS

(root)/svarlang.lib/trunk/svarlang.c – Rev 1376 → 1377