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1283 mateusz.vi 1
/* Sved, the SvarDOS editor
2
 *
3
 * Copyright (C) 2023 Mateusz Viste
4
 *
5
 * Sved is released under the terms of the MIT license.
6
 *
7
 * Permission is hereby granted, free of charge, to any person obtaining a copy
8
 * of this software and associated documentation files (the "Software"), to
9
 * deal in the Software without restriction, including without limitation the
10
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
11
 * sell copies of the Software, and to permit persons to whom the Software is
12
 * furnished to do so, subject to the following conditions:
13
 *
14
 * The above copyright notice and this permission notice shall be included in
15
 * all copies or substantial portions of the Software.
16
 *
17
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
23
 * IN THE SOFTWARE.
24
 */
1275 mateusz.vi 25
 
1282 mateusz.vi 26
#include <dos.h>
27
#include <fcntl.h>
1275 mateusz.vi 28
#include <stdlib.h>
29
#include <string.h>
1288 mateusz.vi 30
#include <malloc.h>   /* _fcalloc() */
1275 mateusz.vi 31
 
32
#include "mdr\cout.h"
1307 mateusz.vi 33
#include "mdr\dos.h"
1275 mateusz.vi 34
#include "mdr\keyb.h"
35
 
1282 mateusz.vi 36
#include "svarlang\svarlang.h"
37
 
1275 mateusz.vi 38
#define COL_TXT        0
39
#define COL_STATUSBAR1 1
40
#define COL_STATUSBAR2 2
41
#define COL_SCROLLBAR  3
42
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
43
static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};
44
 
45
#define SCROLL_CURSOR 0xB1
46
 
47
 
48
struct line {
1288 mateusz.vi 49
  struct line far *prev;
50
  struct line far *next;
1275 mateusz.vi 51
  unsigned short len;
52
  char payload[1];
53
};
54
 
55
struct linedb {
1288 mateusz.vi 56
  struct line far *topscreen;
57
  struct line far *cursor;
1275 mateusz.vi 58
  unsigned short xoffset;
59
};
60
 
61
 
1287 mateusz.vi 62
/* returns non-zero on error */
1289 mateusz.vi 63
static int line_add(struct linedb *db, const char far *line) {
64
  unsigned short slen;
1288 mateusz.vi 65
  struct line far *l;
1275 mateusz.vi 66
 
1289 mateusz.vi 67
  /* slen = strlen(line) (but for far pointer) */
68
  for (slen = 0; line[slen] != 0; slen++);
69
 
1275 mateusz.vi 70
  /* trim out CR/LF line endings */
71
  if ((slen >= 2) && (line[slen - 2] == '\r')) {
72
    slen -= 2;
73
  } else if ((slen >= 1) && (line[slen - 1] == '\n')) {
74
    slen--;
75
  }
76
 
1288 mateusz.vi 77
  l = _fcalloc(1, sizeof(struct line) + slen + 1);
1287 mateusz.vi 78
  if (l == NULL) return(-1);
79
 
1275 mateusz.vi 80
  l->prev = db->cursor;
81
  if (db->cursor) {
82
    l->next = db->cursor->next;
83
    db->cursor->next = l;
84
    l->next->prev = l;
85
  }
86
  db->cursor = l;
1288 mateusz.vi 87
  _fmemcpy(l->payload, line, slen);
1275 mateusz.vi 88
  l->len = slen;
1287 mateusz.vi 89
 
90
  return(0);
1275 mateusz.vi 91
}
92
 
93
 
1289 mateusz.vi 94
static void db_rewind(struct linedb *db) {
1275 mateusz.vi 95
  if (db->cursor == NULL) return;
96
  while (db->cursor->prev) db->cursor = db->cursor->prev;
97
  db->topscreen = db->cursor;
98
}
99
 
100
 
1289 mateusz.vi 101
static void load_colorscheme(void) {
1275 mateusz.vi 102
  scheme[COL_TXT] = 0x17;
103
  scheme[COL_STATUSBAR1] = 0x70;
104
  scheme[COL_STATUSBAR2] = 0x78;
105
  scheme[COL_SCROLLBAR] = 0x70;
106
}
107
 
108
 
1282 mateusz.vi 109
static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname) {
1275 mateusz.vi 110
  unsigned char i;
1302 mateusz.vi 111
  const char *s = svarlang_strid(0); /* HELP */
1275 mateusz.vi 112
  unsigned char helpcol = screenw - (strlen(s) + 4);
113
 
114
  /* clear screen */
115
  mdr_cout_cls(scheme[COL_TXT]);
116
 
117
  /* status bar */
118
  for (i = 0; i < helpcol; i++) {
119
    mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);
120
    if (*fname != 0) fname++;
121
  }
122
  mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);
123
  mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);
124
 
125
  /* scroll bar */
126
  for (i = 0; i < (screenh - 1); i++) {
127
    mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);
128
  }
129
}
130
 
131
 
1282 mateusz.vi 132
static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {
1275 mateusz.vi 133
  unsigned char y = 0;
134
  unsigned char len;
1288 mateusz.vi 135
  struct line far *l;
1275 mateusz.vi 136
 
1288 mateusz.vi 137
#ifdef DBG_REFRESH
1282 mateusz.vi 138
  static char m = 'a';
139
  m++;
140
  if (m > 'z') m = 'a';
1288 mateusz.vi 141
#endif
1282 mateusz.vi 142
 
1289 mateusz.vi 143
  for (l = db->topscreen; l != NULL; l = l->next, y++) {
1282 mateusz.vi 144
 
145
    /* skip lines that do not to be refreshed */
1289 mateusz.vi 146
    if (y < uidirtyfrom) continue;
147
    if (y > uidirtyto) break;
1282 mateusz.vi 148
 
1275 mateusz.vi 149
    if (db->xoffset < l->len) {
1288 mateusz.vi 150
      for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);
1275 mateusz.vi 151
    } else {
152
      len = 0;
153
    }
154
    while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);
1282 mateusz.vi 155
 
1288 mateusz.vi 156
#ifdef DBG_REFRESH
1282 mateusz.vi 157
    mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);
1288 mateusz.vi 158
#endif
1282 mateusz.vi 159
 
1275 mateusz.vi 160
    if (y == screenh - 2) break;
161
  }
162
}
163
 
164
 
1282 mateusz.vi 165
static void check_cursor_not_after_eol(struct linedb *db, unsigned char *cursorpos, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
1275 mateusz.vi 166
  if (db->xoffset + *cursorpos <= db->cursor->len) return;
167
 
168
  if (db->cursor->len < db->xoffset) {
169
    *cursorpos = 0;
170
    db->xoffset = db->cursor->len;
1282 mateusz.vi 171
    *uidirtyfrom = 0;
172
    *uidirtyto = 0xff;
1275 mateusz.vi 173
  } else {
174
    *cursorpos = db->cursor->len - db->xoffset;
175
  }
176
}
177
 
178
 
1282 mateusz.vi 179
static void cursor_up(struct linedb *db, unsigned char *cursorposy, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
1275 mateusz.vi 180
  if (db->cursor->prev != NULL) {
181
    db->cursor = db->cursor->prev;
182
    if (*cursorposy == 0) {
183
      db->topscreen = db->cursor;
1282 mateusz.vi 184
      *uidirtyfrom = 0;
185
      *uidirtyto = 0xff;
1275 mateusz.vi 186
    } else {
187
      *cursorposy -= 1;
188
    }
189
  }
190
}
191
 
192
 
1282 mateusz.vi 193
static void cursor_eol(struct linedb *db, unsigned char *cursorposx, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
1275 mateusz.vi 194
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 195
  if (db->xoffset > db->cursor->len) {
196
    db->xoffset = db->cursor->len - 1;
197
    *uidirtyfrom = 0;
198
    *uidirtyto = 0xff;
199
  }
200
 
201
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
202
    db->xoffset = db->cursor->len - screenw + 2;
203
    *uidirtyfrom = 0;
204
    *uidirtyto = 0xff;
205
  }
1275 mateusz.vi 206
  *cursorposx = db->cursor->len - db->xoffset;
207
}
208
 
209
 
1282 mateusz.vi 210
static void cursor_down(struct linedb *db, unsigned char *cursorposy, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
1276 mateusz.vi 211
  if (db->cursor->next != NULL) {
212
    db->cursor = db->cursor->next;
213
    if (*cursorposy < screenh - 2) {
214
      *cursorposy += 1;
215
    } else {
216
      db->topscreen = db->topscreen->next;
1282 mateusz.vi 217
      *uidirtyfrom = 0;
218
      *uidirtyto = 0xff;
1276 mateusz.vi 219
    }
220
  }
221
}
222
 
223
 
1302 mateusz.vi 224
static void cursor_left(struct linedb *db, unsigned char *cursorposx, unsigned char *cursorposy, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
225
  if (*cursorposx > 0) {
226
    *cursorposx -= 1;
227
  } else if (db->xoffset > 0) {
228
    db->xoffset -= 1;
229
    *uidirtyfrom = 0;
230
    *uidirtyto = 0xff;
231
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
232
    cursor_up(db, cursorposy, uidirtyfrom, uidirtyto);
233
    cursor_eol(db, cursorposx, screenw, uidirtyfrom, uidirtyto);
234
  }
235
}
236
 
237
 
1282 mateusz.vi 238
static void cursor_home(struct linedb *db, unsigned char *cursorposx, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
1276 mateusz.vi 239
  *cursorposx = 0;
1282 mateusz.vi 240
  if (db->xoffset != 0) {
241
    db->xoffset = 0;
242
    *uidirtyfrom = 0;
243
    *uidirtyto = 0xff;
244
  }
1276 mateusz.vi 245
}
246
 
247
 
1308 mateusz.vi 248
static void cursor_right(struct linedb *db, unsigned char *cursorposx, unsigned char *cursorposy, unsigned char screenw, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
249
  if (db->cursor->len > db->xoffset + *cursorposx) {
250
    if (*cursorposx < screenw - 2) {
251
      *cursorposx += 1;
252
    } else {
253
      db->xoffset += 1;
254
      *uidirtyfrom = 0;
255
      *uidirtyto = 0xff;
256
    }
257
  } else {
258
    cursor_down(db, cursorposy, screenh, uidirtyfrom, uidirtyto);
259
    cursor_home(db, cursorposx, uidirtyfrom, uidirtyto);
260
  }
261
}
262
 
263
 
1292 mateusz.vi 264
static void del(struct linedb *db, unsigned char cursorposx, unsigned char cursorposy, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
265
  if (cursorposx + db->xoffset < db->cursor->len) {
266
    _fmemmove(db->cursor->payload + cursorposx + db->xoffset, db->cursor->payload + cursorposx + db->xoffset + 1, db->cursor->len - cursorposx - db->xoffset);
267
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
268
    *uidirtyfrom = cursorposy;
269
    *uidirtyto = cursorposy;
270
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
271
    struct line far *nextline = db->cursor->next;
272
    if (db->cursor->next->len > 0) {
273
      void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);
274
      if (newptr != NULL) {
275
        db->cursor = newptr;
276
        _fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
277
        db->cursor->len += db->cursor->next->len;
278
        /* update db->topscreen if needed */
279
        if (cursorposy == 0) db->topscreen = db->cursor;
280
      }
281
    }
282
    db->cursor->next = db->cursor->next->next;
283
    db->cursor->next->prev = db->cursor;
284
    if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
285
    _ffree(nextline);
286
    *uidirtyfrom = cursorposy;
287
    *uidirtyto = 0xff;
288
  }
289
}
290
 
291
 
1302 mateusz.vi 292
static void bkspc(struct linedb *db, unsigned char *cursorposx, unsigned char *cursorposy, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
293
 
294
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
295
  if ((*cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
296
 
297
  cursor_left(db, cursorposx, cursorposy, screenw, uidirtyfrom, uidirtyto);
298
  del(db, *cursorposx, *cursorposy, uidirtyfrom, uidirtyto);
299
}
300
 
301
 
1286 mateusz.vi 302
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
303
 * of argc and argv, saves some 330 bytes of binary size */
304
static char *parseargv(void) {
305
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
306
  unsigned char count = 0;
307
  char *argv[4];
308
 
309
  while (count < 4) {
310
    /* jump to nearest arg */
311
    while (*tail == ' ') {
312
      *tail = 0;
313
      tail++;
314
    }
315
 
316
    if (*tail == '\r') {
317
      *tail = 0;
318
      break;
319
    }
320
 
321
    argv[count++] = tail;
322
 
323
    /* jump to next delimiter */
324
    while ((*tail != ' ') && (*tail != '\r')) tail++;
325
  }
326
 
327
  /* check args now */
328
  if (count != 1) return(NULL);
329
 
330
  return(argv[0]);
331
}
332
 
333
 
1287 mateusz.vi 334
static int loadfile(struct linedb *db, const char *fname) {
335
  char buff[1024];
336
  unsigned int prevlen = 0, len, llen;
337
  int fd;
338
  int r = 0;
339
 
340
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
341
    mdr_coutraw_puts("Failed to open file:");
342
    mdr_coutraw_puts(fname);
343
    return(-1);
344
  }
345
 
346
  do {
347
    if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {
348
      len += prevlen;
349
    } else {
350
      len = prevlen;
351
    }
352
 
353
    /* look for nearest \n and replace with 0*/
354
    for (llen = 0; buff[llen] != '\n'; llen++) {
355
      if (llen == sizeof(buff)) break;
356
    }
357
    buff[llen] = 0;
358
    if ((llen > 0) && (buff[llen - 1])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */
359
    if (line_add(db, buff) != 0) {
360
      mdr_coutraw_puts("out of memory");
361
      r = -1;
362
      break;
363
    }
364
 
365
    len -= llen + 1;
366
    memmove(buff, buff + llen + 1, len);
367
    prevlen = len;
368
  } while (len > 0);
369
 
370
  _dos_close(fd);
371
 
372
  return(r);
373
}
374
 
375
 
1286 mateusz.vi 376
int main(void) {
377
  const char *fname;
1275 mateusz.vi 378
  struct linedb db;
379
  unsigned char screenw = 0, screenh = 0;
380
  unsigned char cursorposx = 0, cursorposy = 0;
1282 mateusz.vi 381
  unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */
1275 mateusz.vi 382
 
383
  bzero(&db, sizeof(db));
384
 
1307 mateusz.vi 385
  {
386
    char nlspath[128], lang[8];
387
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
388
  }
1282 mateusz.vi 389
 
1286 mateusz.vi 390
  fname = parseargv();
391
 
392
  if (fname == NULL) {
1302 mateusz.vi 393
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
1275 mateusz.vi 394
    return(0);
395
  }
396
 
1282 mateusz.vi 397
  /* load file */
1287 mateusz.vi 398
  if (loadfile(&db, fname) != 0) return(1);
1282 mateusz.vi 399
 
1275 mateusz.vi 400
  /* add an empty line at end if not present already */
401
  if (db.cursor->len != 0) line_add(&db, "");
402
 
403
  if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();
404
  ui_basic(screenw, screenh, fname);
405
 
406
  db_rewind(&db);
407
 
408
  for (;;) {
409
    int k;
410
 
1282 mateusz.vi 411
    check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);
1275 mateusz.vi 412
    mdr_cout_locate(cursorposy, cursorposx);
413
 
1282 mateusz.vi 414
    if (uidirtyfrom != 0xff) {
415
      ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto);
416
      uidirtyfrom = 0xff;
417
    }
1275 mateusz.vi 418
 
419
    k = keyb_getkey();
1282 mateusz.vi 420
 
1275 mateusz.vi 421
    if (k == 0x150) { /* down */
1282 mateusz.vi 422
      cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);
1275 mateusz.vi 423
 
424
    } else if (k == 0x148) { /* up */
1282 mateusz.vi 425
      cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);
1275 mateusz.vi 426
 
427
    } else if (k == 0x14D) { /* right */
1308 mateusz.vi 428
      cursor_right(&db, &cursorposx, &cursorposy, screenw, screenh, &uidirtyfrom, &uidirtyto);
1275 mateusz.vi 429
 
430
    } else if (k == 0x14B) { /* left */
1302 mateusz.vi 431
      cursor_left(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);
1275 mateusz.vi 432
 
1282 mateusz.vi 433
    } else if (k == 0x149) { /* pgup */
434
      // TODO
435
 
436
    } else if (k == 0x151) { /* pgdown */
437
      // TODO
438
 
439
    } else if (k == 0x147) { /* home */
440
       cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);
441
 
442
    } else if (k == 0x14F) { /* end */
443
       cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);
444
 
1275 mateusz.vi 445
    } else if (k == 0x1B) { /* ESC */
446
      break;
447
 
1289 mateusz.vi 448
    } else if (k == 0x0D) { /* ENTER */
449
      /* add a new line */
450
      if (line_add(&db, db.cursor->payload + db.xoffset + cursorposx) == 0) {
451
        /* trim the line above */
452
        db.cursor->prev->len = db.xoffset + cursorposx;
453
        db.cursor->prev->payload[db.cursor->prev->len] = 0;
454
        /* move cursor to the (new) line below */
455
        cursorposx = 0;
456
        if (cursorposy < screenh - 2) {
457
          uidirtyfrom = cursorposy;
458
          cursorposy++;
459
        } else {
460
          db.topscreen = db.topscreen->next;
461
          uidirtyfrom = 0;
462
        }
463
        uidirtyto = 0xff;
464
      } else {
465
        /* ERROR: OUT OF MEMORY */
466
      }
467
 
1292 mateusz.vi 468
    } else if (k == 0x153) {  /* DEL */
469
      del(&db, cursorposx, cursorposy, &uidirtyfrom, &uidirtyto);
470
 
1302 mateusz.vi 471
    } else if (k == 0x008) { /* BKSPC */
472
      bkspc(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);
473
 
1308 mateusz.vi 474
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
475
      struct line far *n;
476
      n = _frealloc(db.cursor, sizeof(struct line) + db.cursor->len);
477
      if (n != NULL) {
478
        unsigned short off = db.xoffset + cursorposx;
479
        if (n->prev) n->prev->next = n;
480
        if (n->next) n->next->prev = n;
481
        if (db.topscreen == db.cursor) db.topscreen = n;
482
        db.cursor = n;
483
        _fmemmove(db.cursor->payload + off + 1, db.cursor->payload + off, db.cursor->len - off + 1);
484
        db.cursor->len += 1;
485
        uidirtyfrom = cursorposy;
486
        uidirtyto = cursorposy;
487
        db.cursor->payload[off] = k;
488
        cursor_right(&db, &cursorposx, &cursorposy, screenw, screenh, &uidirtyfrom, &uidirtyto);
489
      }
490
 
1282 mateusz.vi 491
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
492
      char buff[4];
493
      const char *HEX = "0123456789ABCDEF";
494
      buff[0] = HEX[(k >> 8) & 15];
495
      buff[1] = HEX[(k >> 4) & 15];
496
      buff[2] = HEX[k & 15];
497
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", scheme[COL_STATUSBAR1], 17);
498
      mdr_cout_str(screenh - 1, 17, buff, scheme[COL_STATUSBAR1], 3);
1275 mateusz.vi 499
      keyb_getkey();
500
      break;
501
    }
502
  }
503
 
504
  mdr_cout_close();
505
 
506
  /* TODO free memory */
507
 
508
  return(0);
509
}