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 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);
}
 

Rev 1277	Rev 1281
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`
-		26	`* stdio amenities */`
-		27	`#ifdef WITHSTDIO`
-		28
-		29	`#include <stdio.h> /* FILE, fopen(), fseek(), etc */`
-		30	`typedef FILE* FHANDLE;`
-		31	`#define FOPEN(x) fopen(x, "rb")`
-		32	`#define FCLOSE(x) fclose(x)`
-		33	`#define FSEEK(f,b) fseek(f,b,SEEK_CUR)`
-		34	`#define FREAD(f,t,b) fread(t, 1, b, f)`
-		35
-		36	`#else`
-		37
25	`#include <i86.h>`	38	`#include <i86.h>`
-		39	`typedef unsigned short FHANDLE;`
-		40
-		41	`#endif`
-		42
26	`#include <stdlib.h> /* NULL */`	43	`#include <stdlib.h> /* NULL */`
27	`#include <string.h> /* memcmp(), strcpy() */`	44	`#include <string.h> /* memcmp(), strcpy() */`
28		45
29	`#include "svarlang.h"`	46	`#include "svarlang.h"`
30		47
31		48
32	`/* supplied through DEFLANG.C */`	49	`/* supplied through DEFLANG.C */`
33	`extern char svarlang_mem[];`	50	`extern char svarlang_mem[];`
34	`extern const unsigned short svarlang_memsz;`	51	`extern const unsigned short svarlang_memsz;`
35		52
36		53
37	`const char *svarlang_strid(unsigned short id) {`	54	`const char *svarlang_strid(unsigned short id) {`
38	`const char *ptr = svarlang_mem;`	55	`const char *ptr = svarlang_mem;`
39	`/* find the string id in langblock memory */`	56	`/* find the string id in langblock memory */`
40	`for (;;) {`	57	`for (;;) {`
41	`if (((unsigned short *)ptr)[0] == id) return(ptr + 4);`	58	`if (((unsigned short *)ptr)[0] == id) return(ptr + 4);`
42	`if (((unsigned short )ptr)[1] == 0) return(ptr + 2); / end of strings - return an empty string */`	59	`if (((unsigned short )ptr)[1] == 0) return(ptr + 2); / end of strings - return an empty string */`
43	`ptr += ((unsigned short *)ptr)[1] + 4;`	60	`ptr += ((unsigned short *)ptr)[1] + 4;`
44	`}`	61	`}`
45	`}`	62	`}`
46		63
47		-
-		64	`/* 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`
-		66	`* smaller if the application does not need to pull fopen() and friends */`
-		67	`#ifndef WITHSTDIO`
48	`static unsigned short FOPEN(const char *s) {`	68	`static unsigned short FOPEN(const char *s) {`
49	`unsigned short fname_seg = FP_SEG(s);`	69	`unsigned short fname_seg = FP_SEG(s);`
50	`unsigned short fname_off = FP_OFF(s);`	70	`unsigned short fname_off = FP_OFF(s);`
51	`unsigned short res = 0xffff;`	71	`unsigned short res = 0; /* fd 0 is already used by stdout so it's a good error value */`
52	`_asm {`	72	`_asm {`
53	`push dx`	73	`push dx`
54	`push ds`	74	`push ds`
55		75
56	`mov ax, fname_seg`	76	`mov ax, fname_seg`
57	`mov dx, fname_off`	77	`mov dx, fname_off`
58	`mov ds, ax`	78	`mov ds, ax`
59	`mov ax, 0x3d00 /* open file, read-only (fname at DS:DX) */`	79	`mov ax, 0x3d00 /* open file, read-only (fname at DS:DX) */`
60	`int 0x21`	80	`int 0x21`
61	`pop ds`	81	`pop ds`
62	`jc ERR`	82	`jc ERR`
63	`mov res, ax`	83	`mov res, ax`
64		84
65	`ERR:`	85	`ERR:`
66	`pop dx`	86	`pop dx`
67	`}`	87	`}`
68		88
69	`return(res);`	89	`return(res);`
70	`}`	90	`}`
71		91
72		92
73	`static void FCLOSE(unsigned short handle) {`	93	`static void FCLOSE(unsigned short handle) {`
74	`_asm {`	94	`_asm {`
75	`push bx`	95	`push bx`
76		96
77	`mov ah, 0x3e`	97	`mov ah, 0x3e`
78	`mov bx, handle`	98	`mov bx, handle`
79	`int 0x21`	99	`int 0x21`
80		100
81	`pop bx`	101	`pop bx`
82	`}`	102	`}`
83	`}`	103	`}`
84		104
85		105
86	`static unsigned short FREAD(unsigned short handle, void *buff, unsigned short bytes) {`	106	`static unsigned short FREAD(unsigned short handle, void *buff, unsigned short bytes) {`
87	`unsigned short buff_seg = FP_SEG(buff);`	107	`unsigned short buff_seg = FP_SEG(buff);`
88	`unsigned short buff_off = FP_OFF(buff);`	108	`unsigned short buff_off = FP_OFF(buff);`
89	`unsigned short res = 0;`	109	`unsigned short res = 0;`
90		110
91	`_asm {`	111	`_asm {`
92	`push bx`	112	`push bx`
93	`push cx`	113	`push cx`
94	`push dx`	114	`push dx`
95		115
96	`mov bx, handle`	116	`mov bx, handle`
97	`mov cx, bytes`	117	`mov cx, bytes`
98	`mov dx, buff_off`	118	`mov dx, buff_off`
99	`mov ax, buff_seg`	119	`mov ax, buff_seg`
100	`push ds`	120	`push ds`
101	`mov ds, ax`	121	`mov ds, ax`
102	`mov ah, 0x3f /* read cx bytes from file handle bx to DS:DX */`	122	`mov ah, 0x3f /* read cx bytes from file handle bx to DS:DX */`
103	`int 0x21`	123	`int 0x21`
104	`pop ds`	124	`pop ds`
105	`jc ERR`	125	`jc ERR`
106		126
107	`mov res, ax`	127	`mov res, ax`
108	`ERR:`	128	`ERR:`
109		129
110	`pop dx`	130	`pop dx`
111	`pop cx`	131	`pop cx`
112	`pop bx`	132	`pop bx`
113	`}`	133	`}`
114		134
115	`return(res);`	135	`return(res);`
116	`}`	136	`}`
117		137
118		138
119	`static void FJUMP(unsigned short handle, unsigned short bytes) {`	139	`static void FSEEK(unsigned short handle, unsigned short bytes) {`
120	`_asm {`	140	`_asm {`
121	`push bx`	141	`push bx`
122	`push cx`	142	`push cx`
123	`push dx`	143	`push dx`
124		144
125	`mov ax, 0x4201 /* move file pointer from cur pos + CX:DX */`	145	`mov ax, 0x4201 /* move file pointer from cur pos + CX:DX */`
126	`mov bx, handle`	146	`mov bx, handle`
127	`xor cx, cx`	147	`xor cx, cx`
128	`mov dx, bytes`	148	`mov dx, bytes`
129	`int 0x21`	149	`int 0x21`
130		150
131	`pop dx`	151	`pop dx`
132	`pop cx`	152	`pop cx`
133	`pop bx`	153	`pop bx`
134	`}`	154	`}`
135	`}`	155	`}`
136		156	`#endif`
137		157
138	`int svarlang_load(const char fname, const char lang) {`	158	`int svarlang_load(const char fname, const char lang) {`
139	`unsigned short langid;`	159	`unsigned short langid;`
140	`unsigned short fd;`	-
141	`char hdr[4];`	160	`char hdr[4];`
142	`unsigned short buff16[2];`	161	`unsigned short buff16[2];`
-		162	`FHANDLE fd;`
143		163
144	`langid = ((unsigned short )lang);`	164	`langid = ((unsigned short )lang);`
145	`langid &= 0xDFDF; /* make sure lang is upcase */`	165	`langid &= 0xDFDF; /* make sure lang is upcase */`
146		166
147	`fd = FOPEN(fname);`	167	`fd = FOPEN(fname);`
148	`if (fd == 0xffff) return(-1);`	168	`if (!fd) return(-1);`
149		169
150	`/* read hdr, should be "SvL\33" */`	170	`/* read hdr, should be "SvL\33" */`
151	`if ((FREAD(fd, hdr, 4) != 4) \|\| (memcmp(hdr, "SvL\33", 4) != 0)) {`	171	`if ((FREAD(fd, hdr, 4) != 4) \|\| (memcmp(hdr, "SvL\33", 4) != 0)) {`
152	`FCLOSE(fd);`	172	`FCLOSE(fd);`
153	`return(-3);`	173	`return(-3);`
154	`}`	174	`}`
155		175
156	`/* read next lang id in file */`	176	`/* read next lang id in file */`
157	`while (FREAD(fd, buff16, 4) == 4) {`	177	`while (FREAD(fd, buff16, 4) == 4) {`
158		178
159	`/* is it the lang I am looking for? */`	179	`/* is it the lang I am looking for? */`
160	`if (buff16[0] != langid) { /* skip to next lang */`	180	`if (buff16[0] != langid) { /* skip to next lang */`
161	`FJUMP(fd, buff16[1]);`	181	`FSEEK(fd, buff16[1]);`
162	`continue;`	182	`continue;`
163	`}`	183	`}`
164		184
165	`/* found - but do I have enough memory space? */`	185	`/* found - but do I have enough memory space? */`
166	`if (buff16[1] >= svarlang_memsz) {`	186	`if (buff16[1] >= svarlang_memsz) {`
167	`FCLOSE(fd);`	187	`FCLOSE(fd);`
168	`return(-4);`	188	`return(-4);`
169	`}`	189	`}`
170		190
171	`/* load strings */`	191	`/* load strings */`
172	`if (FREAD(fd, svarlang_mem, buff16[1]) != buff16[1]) break;`	192	`if (FREAD(fd, svarlang_mem, buff16[1]) != buff16[1]) break;`
173	`FCLOSE(fd);`	193	`FCLOSE(fd);`
174	`return(0);`	194	`return(0);`
175	`}`	195	`}`
176		196
177	`FCLOSE(fd);`	197	`FCLOSE(fd);`
178	`return(-5);`	198	`return(-5);`
179	`}`	199	`}`
180		200

Subversion Repositories SvarDOS

(root)/svarlang.lib/trunk/svarlang.c – Rev 1277 → 1281