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1283 mateusz.vi 1
/* Sved, the SvarDOS editor
2
 *
1759 mateusz.vi 3
 * Copyright (C) 2023-2024 Mateusz Viste
1283 mateusz.vi 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
 
1556 mateusz.vi 26
#include <i86.h> /* MK_FP() */
1275 mateusz.vi 27
 
1312 mateusz.vi 28
#include "mdr\bios.h"
1275 mateusz.vi 29
#include "mdr\cout.h"
1307 mateusz.vi 30
#include "mdr\dos.h"
1275 mateusz.vi 31
 
1282 mateusz.vi 32
#include "svarlang\svarlang.h"
33
 
1326 mateusz.vi 34
 
1759 mateusz.vi 35
#define PVER "2024.0"
36
#define PDATE "2023-2024"
1356 mateusz.vi 37
 
1326 mateusz.vi 38
/*****************************************************************************
39
 * global variables and definitions                                          *
40
 *****************************************************************************/
41
 
1275 mateusz.vi 42
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
1333 mateusz.vi 43
static unsigned char SCHEME_TEXT   = 0x07,
1354 mateusz.vi 44
                     SCHEME_MENU   = 0x70,
45
                     SCHEME_MENU_CUR= 0x0f,
46
                     SCHEME_MENU_SEL= 0x00,
1333 mateusz.vi 47
                     SCHEME_STBAR1 = 0x70,
1358 mateusz.vi 48
                     SCHEME_STBAR2 = 0x70, /* greyed out information */
49
                     SCHEME_STBAR3 = 0x70, /* query */
1333 mateusz.vi 50
                     SCHEME_SCROLL = 0x70,
51
                     SCHEME_MSG    = 0x70,
1358 mateusz.vi 52
                     SCHEME_ERR    = 0x70;
1327 mateusz.vi 53
 
1427 mateusz.vi 54
static unsigned char screenw, screenh, screenlastrow, screenlastcol;
1412 mateusz.vi 55
static unsigned char glob_monomode, glob_tablessmode;
1275 mateusz.vi 56
 
1548 mateusz.vi 57
static char buff[512]; /* short lived buffer for whatever needed */
58
 
1327 mateusz.vi 59
static struct {
60
    unsigned char from;
61
    unsigned char to;
1342 mateusz.vi 62
    unsigned char statusbar;
63
} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */
1327 mateusz.vi 64
 
1275 mateusz.vi 65
#define SCROLL_CURSOR 0xB1
66
 
67
struct line {
1430 mateusz.vi 68
  unsigned short len;
69
  struct line far *next;
1288 mateusz.vi 70
  struct line far *prev;
1275 mateusz.vi 71
  char payload[1];
72
};
73
 
1315 mateusz.vi 74
struct file {
1288 mateusz.vi 75
  struct line far *cursor;
1275 mateusz.vi 76
  unsigned short xoffset;
1348 mateusz.vi 77
  unsigned short cursorposx;
78
  unsigned short cursorposy;
1328 mateusz.vi 79
  unsigned short totlines;
80
  unsigned short curline;
1436 mateusz.vi 81
  unsigned short curline_prev;
1330 mateusz.vi 82
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
83
  char modflag;  /* non-zero if file has been modified since last save */
1355 mateusz.vi 84
  char modflagprev;
1549 mateusz.vi 85
  char slotid; /* 0..9 */
1332 mateusz.vi 86
  char fname[128];
1275 mateusz.vi 87
};
88
 
89
 
1572 mateusz.vi 90
 
1326 mateusz.vi 91
/*****************************************************************************
1578 mateusz.vi 92
 * assembly pragma "functions"                                               *
1572 mateusz.vi 93
 *****************************************************************************/
94
 
1578 mateusz.vi 95
 
1580 mateusz.vi 96
unsigned short dos_alloc(unsigned short siz);
1572 mateusz.vi 97
 
1580 mateusz.vi 98
#pragma aux dos_alloc = \
1572 mateusz.vi 99
"mov ah, 0x48" \
100
"int 0x21" \
101
"jnc done" \
102
"xor ax, ax" \
103
"done:" \
104
parm [bx] \
105
value [ax];
106
 
107
 
1580 mateusz.vi 108
unsigned short dos_free(unsigned short segn);
1572 mateusz.vi 109
 
1580 mateusz.vi 110
#pragma aux dos_free = \
1572 mateusz.vi 111
"mov ah, 0x49" \
112
"int 0x21" \
113
"jc done" \
114
"xor ax, ax" \
115
"done:" \
116
parm [es] \
117
value [ax];
118
 
1578 mateusz.vi 119
 
1580 mateusz.vi 120
unsigned short dos_fclose(unsigned short handle);
1572 mateusz.vi 121
 
1580 mateusz.vi 122
#pragma aux dos_fclose = \
1573 mateusz.vi 123
"mov ah,0x3e" \
124
"int 0x21" \
125
"jc done" \
126
"xor ax, ax" \
127
"done:" \
128
parm [bx] \
129
value [ax];
130
 
1578 mateusz.vi 131
 
1580 mateusz.vi 132
unsigned short dos_fread(unsigned short handle, void *buf, unsigned short count, unsigned short *bytes);
1573 mateusz.vi 133
 
1580 mateusz.vi 134
#pragma aux dos_fread = \
1574 mateusz.vi 135
"mov ah, 0x3f" \
136
"int 0x21" \
137
"jc done" \
138
"mov [di], ax" \
139
"xor ax, ax" \
140
"done:" \
141
parm [bx] [dx] [cx] [di] \
142
value [ax]
143
 
1578 mateusz.vi 144
 
1576 mateusz.vi 145
unsigned short dos_resizeblock(unsigned short siz, unsigned short segn);
1574 mateusz.vi 146
 
1576 mateusz.vi 147
#pragma aux dos_resizeblock = \
148
"mov ah, 0x4a" \
149
"int 0x21" \
150
"jc done" \
151
"xor ax, ax" \
152
"done:" \
153
parm [bx] [es] \
154
value [ax]
1574 mateusz.vi 155
 
1576 mateusz.vi 156
 
1580 mateusz.vi 157
unsigned short dos_fwrite(unsigned short handle, unsigned short count, unsigned short *bytes, const void far *buf);
1578 mateusz.vi 158
/* NOTE: last parameter (far pointer buf) is passed on the stack */
1580 mateusz.vi 159
#pragma aux dos_fwrite = \
1579 mateusz.vi 160
"push ds"   /* save DS into AX */ \
1578 mateusz.vi 161
"pop ax" \
162
"pop dx" \
163
"pop ds" \
1579 mateusz.vi 164
"push ax"   /* save DS into stack for later restoration */ \
1578 mateusz.vi 165
"mov ah, 0x40" \
166
"int 0x21" \
167
"pop ds" \
168
"jc done" \
169
"mov [di], ax" \
170
"xor ax, ax" \
171
"done:" \
172
parm [bx] [cx] [di] \
173
value [ax]
174
 
175
 
1572 mateusz.vi 176
/*****************************************************************************
1326 mateusz.vi 177
 * functions                                                                 *
178
 *****************************************************************************/
179
 
1575 mateusz.vi 180
 
181
static size_t strlen(const char *s) {
182
  const char *ptr = s;
183
  while (*ptr != 0) ptr++;
184
  return(ptr - s);
185
}
186
 
187
 
188
static void bzero(void *ptr, size_t len) {
189
  char *p = ptr;
190
  while (len > 0) {
191
    *p = 0;
192
    p++;
193
    len--;
194
  }
195
}
196
 
197
 
198
static void fmemmove(void far *dst, const void far *src, size_t len) {
1579 mateusz.vi 199
  short delta = 1;
200
  /* detect possible overlap in the forward direction */
201
  if (dst >= src) {
202
    dst = (char far *)dst + len - 1;
203
    src = (char far *)src + len - 1;
204
    delta = -1;
205
  }
1575 mateusz.vi 206
  while (len-- > 0) {
207
    *(char far *)dst = *(char far *)src;
1579 mateusz.vi 208
    dst = (char far *)dst + delta;
209
    src = (char far *)src + delta;
1575 mateusz.vi 210
  }
211
}
212
 
213
 
1339 mateusz.vi 214
static struct line far *line_calloc(unsigned short siz) {
1342 mateusz.vi 215
  struct line far *res;
1556 mateusz.vi 216
  unsigned short seg;
1461 mateusz.vi 217
 
1580 mateusz.vi 218
  seg = dos_alloc((sizeof(struct line) + siz + 15) / 16);
1556 mateusz.vi 219
  if (seg == 0) return(NULL);
1342 mateusz.vi 220
  res = MK_FP(seg, 0);
1461 mateusz.vi 221
  res->len = 0;
222
  res->next = NULL;
223
  res->prev = NULL;
224
 
225
  return(res);
1339 mateusz.vi 226
}
227
 
228
 
229
static void line_free(struct line far *ptr) {
1580 mateusz.vi 230
  dos_free(FP_SEG(ptr));
1339 mateusz.vi 231
}
232
 
233
 
1550 mateusz.vi 234
static int curline_resize(struct file *db, unsigned short newsiz) {
1339 mateusz.vi 235
  struct line far *newptr;
236
 
1341 mateusz.vi 237
  /* try resizing the block (much faster) */
1576 mateusz.vi 238
  if (dos_resizeblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor)) == 0) return(0);
1339 mateusz.vi 239
 
240
  /* create a new block and copy data over */
241
  newptr = line_calloc(newsiz);
1340 mateusz.vi 242
  if (newptr == NULL) return(-1);
1568 mateusz.vi 243
  fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
1340 mateusz.vi 244
 
245
  /* rewire the linked list */
246
  db->cursor = newptr;
247
  if (newptr->next) newptr->next->prev = newptr;
248
  if (newptr->prev) newptr->prev->next = newptr;
249
 
250
  return(0);
1339 mateusz.vi 251
}
252
 
253
 
1328 mateusz.vi 254
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 255
 * returns non-zero on error */
1328 mateusz.vi 256
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 257
  struct line far *l;
1275 mateusz.vi 258
 
1339 mateusz.vi 259
  l = line_calloc(slen);
1287 mateusz.vi 260
  if (l == NULL) return(-1);
261
 
1275 mateusz.vi 262
  l->prev = db->cursor;
263
  if (db->cursor) {
264
    l->next = db->cursor->next;
265
    db->cursor->next = l;
266
    l->next->prev = l;
267
  }
268
  db->cursor = l;
1342 mateusz.vi 269
  if (slen > 0) {
1568 mateusz.vi 270
    fmemmove(l->payload, line, slen);
1342 mateusz.vi 271
    l->len = slen;
272
  }
1287 mateusz.vi 273
 
1328 mateusz.vi 274
  db->totlines += 1;
275
  db->curline += 1;
276
 
1287 mateusz.vi 277
  return(0);
1275 mateusz.vi 278
}
279
 
280
 
1348 mateusz.vi 281
static void ui_getstring(const char *query, char *s, unsigned short maxlen) {
282
  unsigned short len = 0;
1544 mateusz.vi 283
  unsigned char x;
1332 mateusz.vi 284
  int k;
285
 
286
  if (maxlen == 0) return;
287
  maxlen--; /* make room for the nul terminator */
288
 
289
  /* print query string */
1544 mateusz.vi 290
  x = mdr_cout_str(screenlastrow, 0, query, SCHEME_STBAR3, 40);
291
  mdr_cout_char_rep(screenlastrow, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 292
 
293
  for (;;) {
1544 mateusz.vi 294
    mdr_cout_locate(screenlastrow, x + len);
1410 mateusz.vi 295
    k = mdr_dos_getkey2();
1332 mateusz.vi 296
 
1345 mateusz.vi 297
    switch (k) {
298
      case 0x1b: /* ESC */
299
        s[0] = 0;
300
        return;
301
      case '\r':
302
        s[len] = 0;
303
        return;
304
      case 0x08: /* BKSPC */
305
        if (len > 0) {
306
          len--;
1544 mateusz.vi 307
          mdr_cout_char(screenlastrow, x + len, ' ', SCHEME_STBAR3);
1345 mateusz.vi 308
        }
309
        break;
310
      default:
311
        if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
1544 mateusz.vi 312
          mdr_cout_char(screenlastrow, x + len, k, SCHEME_STBAR3);
1345 mateusz.vi 313
          s[len++] = k;
314
        }
1332 mateusz.vi 315
    }
1345 mateusz.vi 316
  }
1332 mateusz.vi 317
 
318
}
319
 
320
 
1324 mateusz.vi 321
/* append a nul-terminated string to line at cursor position */
1550 mateusz.vi 322
static int line_append(struct file *f, const char *buf, unsigned short len) {
1427 mateusz.vi 323
  if (sizeof(struct line) + f->cursor->len + len < len) goto ERR; /* overflow check */
324
  if (curline_resize(f, f->cursor->len + len) != 0) goto ERR;
325
 
1568 mateusz.vi 326
  fmemmove(f->cursor->payload + f->cursor->len, buf, len);
1324 mateusz.vi 327
  f->cursor->len += len;
328
 
329
  return(0);
1427 mateusz.vi 330
  ERR:
331
  return(-1);
1324 mateusz.vi 332
}
333
 
334
 
1315 mateusz.vi 335
static void db_rewind(struct file *db) {
1275 mateusz.vi 336
  if (db->cursor == NULL) return;
337
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 338
  db->curline = 0;
1275 mateusz.vi 339
}
340
 
341
 
1541 mateusz.vi 342
/* saves db file, resets db->modflag on success and overwrites the filename
343
 * field if saveas is not NULL */
344
static int savefile(struct file *db, const char *saveas) {
1539 mateusz.vi 345
  int fd = 0;
346
  const struct line far *l;
1556 mateusz.vi 347
  unsigned short bytes;
1539 mateusz.vi 348
  unsigned char eollen = 2;
349
  const unsigned char *eolbuf = "\r\n";
350
  int errflag = 0;
351
 
352
  /* if filename not overloaded then use the fname in db */
353
  if (saveas == NULL) saveas = db->fname;
354
 
355
  _asm {
356
    push cx
357
    push dx
358
 
359
    mov ah, 0x3C    /* create or truncate file */
360
    xor cx, cx      /* file attributes */
361
    mov dx, saveas  /* works only in SMALL/TINY mode */
362
    int 0x21
363
    jnc DONE
364
    mov errflag, ax
365
    DONE:
366
    mov fd, ax
367
 
368
    pop dx
369
    pop cx
370
  }
371
 
372
  if (errflag != 0) return(-1);
373
 
374
  l = db->cursor;
375
  while (l->prev) l = l->prev;
376
 
377
  /* preset line terminators */
378
  if (db->lfonly) {
379
    eolbuf++;
380
    eollen--;
381
  }
382
 
383
  while (l) {
384
    /* do not write the last empty line, it is only useful for edition */
385
    if (l->len != 0) {
1580 mateusz.vi 386
      errflag |= dos_fwrite(fd, l->len, &bytes, l->payload);
1539 mateusz.vi 387
    } else if (l->next == NULL) {
388
      break;
389
    }
1580 mateusz.vi 390
    errflag |= dos_fwrite(fd, eollen, &bytes, eolbuf);
1539 mateusz.vi 391
    l = l->next;
392
  }
393
 
1580 mateusz.vi 394
  errflag |= dos_fclose(fd);
1539 mateusz.vi 395
 
1541 mateusz.vi 396
  /* did it all work? */
397
  if (errflag == 0) {
398
    db->modflag = 0;
399
    if (saveas != db->fname) mdr_dos_truename(db->fname, saveas);
400
  }
401
 
1539 mateusz.vi 402
  return(errflag);
403
}
404
 
405
 
1549 mateusz.vi 406
static void ui_statusbar(const struct file *db) {
1356 mateusz.vi 407
  const char *s = svarlang_strid(0); /* ESC=MENU */
1348 mateusz.vi 408
  unsigned short helpcol = screenw - strlen(s);
1440 mateusz.vi 409
  unsigned short col;
1275 mateusz.vi 410
 
1425 mateusz.vi 411
  /* slot number (guaranteed to be 0-9) */
1355 mateusz.vi 412
  {
413
    char slot[4] = "#00";
1549 mateusz.vi 414
    if (db->slotid == 9) {
1425 mateusz.vi 415
      slot[1] = '1';
416
    } else {
1549 mateusz.vi 417
      slot[2] += db->slotid + 1;
1425 mateusz.vi 418
    }
1427 mateusz.vi 419
    mdr_cout_str(screenlastrow, 0, slot, SCHEME_STBAR2, 3);
1355 mateusz.vi 420
  }
1313 mateusz.vi 421
 
1355 mateusz.vi 422
  /* fill rest of status bar with background */
1427 mateusz.vi 423
  mdr_cout_char_rep(screenlastrow, 3, ' ', SCHEME_STBAR1, helpcol - 3);
1355 mateusz.vi 424
 
1313 mateusz.vi 425
  /* eol type */
1330 mateusz.vi 426
  {
427
    const char *eoltype = "CRLF";
1353 mateusz.vi 428
    if (db->lfonly) eoltype += 2;
1440 mateusz.vi 429
    mdr_cout_str(screenlastrow, helpcol - 5, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 430
  }
1313 mateusz.vi 431
 
1438 mateusz.vi 432
  /* line numbers */
1436 mateusz.vi 433
  {
1438 mateusz.vi 434
    unsigned short x;
435
    unsigned char count = 0;
1440 mateusz.vi 436
    col = helpcol - 7;
1438 mateusz.vi 437
 
1439 mateusz.vi 438
    x = db->totlines;
1438 mateusz.vi 439
    AGAIN:
1436 mateusz.vi 440
    do {
1439 mateusz.vi 441
      mdr_cout_char(screenlastrow, col--, '0' + (x % 10), SCHEME_STBAR1);
1436 mateusz.vi 442
      x /= 10;
443
    } while (x);
1438 mateusz.vi 444
    /* redo same exercise, but printing the current line now */
445
    if (count == 0) {
446
      count = 1;
1439 mateusz.vi 447
      mdr_cout_char(screenlastrow, col--, '/', SCHEME_STBAR1);
1438 mateusz.vi 448
      x = 1 + db->curline;
449
      goto AGAIN;
450
    }
1440 mateusz.vi 451
  }
1438 mateusz.vi 452
 
1440 mateusz.vi 453
  /* filename and modflag */
454
  {
455
    const char *fn;
456
    unsigned short x;
457
    unsigned short maxfnlen = col - 6;
458
    if (db->fname[0] == 0) {
459
      fn = svarlang_str(0, 1); /* "UNTITLED" */
460
    } else {
461
      /* display filename up to maxfnlen chars */
462
      fn = db->fname;
463
      x = strlen(fn);
464
      if (x > maxfnlen) fn += x - maxfnlen;
465
    }
466
    x = mdr_cout_str(screenlastrow, 4, fn, SCHEME_STBAR1, maxfnlen);
467
    if (db->modflag) mdr_cout_char(screenlastrow, 5 + x, '!', SCHEME_STBAR2);
1436 mateusz.vi 468
  }
469
 
1427 mateusz.vi 470
  mdr_cout_str(screenlastrow, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 471
}
472
 
473
 
1547 mateusz.vi 474
static void ui_msg(unsigned short msgid1, unsigned short msgid2, unsigned short msgid3, unsigned char attr) {
475
  unsigned short x, y, maxmsglen, i;
476
  unsigned short msgcount = 1;
477
  const char *msg[3];
1331 mateusz.vi 478
 
1547 mateusz.vi 479
  msg[0] = svarlang_strid(msgid1);
480
 
481
  if (msgid2 != 0) {
482
    msgcount = 2;
483
    msg[1] = svarlang_strid(msgid2);
1331 mateusz.vi 484
  }
1547 mateusz.vi 485
  if (msgid3 != 0) {
486
    msgcount = 3;
487
    msg[2] = svarlang_strid(msgid3);
488
  }
1331 mateusz.vi 489
 
1547 mateusz.vi 490
  /* find longest msg */
491
  maxmsglen = 0;
492
  for (i = 0; i < msgcount; i++) {
493
    y = strlen(msg[i]);
494
    if (y > maxmsglen) maxmsglen = y;
495
  }
496
 
1331 mateusz.vi 497
  y = (screenh - 6) >> 1;
1547 mateusz.vi 498
  x = (screenw - maxmsglen - 3) >> 1;
499
  for (i = y+1+msgcount; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, maxmsglen + 2);
1331 mateusz.vi 500
  x++;
1345 mateusz.vi 501
 
1547 mateusz.vi 502
  for (i = 0; i < msgcount; i++) {
503
    mdr_cout_str(y+1+i, x, msg[i], attr, maxmsglen);
504
  }
1312 mateusz.vi 505
 
1327 mateusz.vi 506
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 507
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 508
}
509
 
510
 
1539 mateusz.vi 511
/* returns 0 if operation may proceed, non-zero to cancel */
1541 mateusz.vi 512
static unsigned char ui_confirm_if_unsaved(struct file *db) {
1539 mateusz.vi 513
  int k;
514
 
1342 mateusz.vi 515
  if (db->modflag == 0) return(0);
516
 
1355 mateusz.vi 517
  mdr_cout_cursor_hide();
518
 
1539 mateusz.vi 519
  /* if file has been modified then ask for confirmation:
520
   * ENTER        : agree to data loss
521
   * SPACE        : SAVE file before quit (only if valid filename present)
522
   * anything else: ABORT */
1547 mateusz.vi 523
  ui_msg(4, 5, (db->fname[0])?9:8, SCHEME_MSG);
1342 mateusz.vi 524
 
1539 mateusz.vi 525
  k = mdr_dos_getkey2();
1355 mateusz.vi 526
  mdr_cout_cursor_show();
527
 
1539 mateusz.vi 528
  /* ENTER = agree to loose unsaved data */
529
  if (k == '\r') return(0);
530
 
531
  /* SPACE = save file and continue */
532
  if ((k == ' ') && (db->fname[0] != 0) && (savefile(db, NULL) == 0)) return(0);
533
 
534
  /* any other key = cancel operation */
535
  return(1);
1342 mateusz.vi 536
}
537
 
538
 
1327 mateusz.vi 539
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 540
  unsigned char x;
1310 mateusz.vi 541
  const struct line far *l;
1316 mateusz.vi 542
  unsigned char y = db->cursorposy;
1275 mateusz.vi 543
 
1392 mateusz.vi 544
  /* quit early if nothing to refresh */
545
  if (uidirty.from == 0xff) return;
546
 
1288 mateusz.vi 547
#ifdef DBG_REFRESH
1282 mateusz.vi 548
  static char m = 'a';
549
  m++;
550
  if (m > 'z') m = 'a';
1288 mateusz.vi 551
#endif
1282 mateusz.vi 552
 
1310 mateusz.vi 553
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 554
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 555
 
1310 mateusz.vi 556
  /* iterate over lines and redraw whatever needs to be redrawn */
557
  for (; l != NULL; l = l->next, y++) {
558
 
559
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 560
    if (y < uidirty.from) continue;
561
    if (y > uidirty.to) break;
1282 mateusz.vi 562
 
1318 mateusz.vi 563
    x = 0;
1275 mateusz.vi 564
    if (db->xoffset < l->len) {
1318 mateusz.vi 565
      unsigned char i, limit;
566
      if (l->len - db->xoffset < screenw) {
567
        limit = l->len;
568
      } else {
1427 mateusz.vi 569
        limit = db->xoffset + screenlastcol;
1318 mateusz.vi 570
      }
1333 mateusz.vi 571
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 572
    }
1282 mateusz.vi 573
 
1318 mateusz.vi 574
    /* write empty spaces until end of line */
1427 mateusz.vi 575
    if (x < screenlastcol) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenlastcol - x);
1318 mateusz.vi 576
 
1288 mateusz.vi 577
#ifdef DBG_REFRESH
1333 mateusz.vi 578
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 579
#endif
1282 mateusz.vi 580
 
1275 mateusz.vi 581
    if (y == screenh - 2) break;
582
  }
1310 mateusz.vi 583
 
1319 mateusz.vi 584
  /* fill all lines below if empty (and they need to be redrawn) */
585
  if (l == NULL) {
1427 mateusz.vi 586
    while ((y < screenlastrow) && (y < uidirty.to)) {
587
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenlastcol);
1319 mateusz.vi 588
    }
1318 mateusz.vi 589
  }
1328 mateusz.vi 590
 
591
  /* scroll bar */
1427 mateusz.vi 592
  for (y = 0; y < screenlastrow; y++) {
593
    mdr_cout_char(y, screenlastcol, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 594
  }
595
 
596
  /* scroll cursor */
597
  if (db->totlines >= screenh) {
598
    unsigned short topline = db->curline - db->cursorposy;
599
    unsigned short col;
600
    unsigned short totlines = db->totlines - screenh + 1;
601
    if (db->totlines - screenh > screenh) {
1427 mateusz.vi 602
      col = topline / (totlines / screenlastrow);
1328 mateusz.vi 603
    } else {
1427 mateusz.vi 604
      col = topline * screenlastrow / totlines;
1328 mateusz.vi 605
    }
1427 mateusz.vi 606
    if (col >= screenlastrow) col = screenh - 2;
607
    mdr_cout_char(col, screenlastcol, ' ', SCHEME_SCROLL);
1328 mateusz.vi 608
  }
1392 mateusz.vi 609
 
610
  /* clear out the dirty flag */
611
  uidirty.from = 0xff;
1275 mateusz.vi 612
}
613
 
614
 
1327 mateusz.vi 615
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 616
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 617
 
618
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 619
    db->cursorposx = 0;
1275 mateusz.vi 620
    db->xoffset = db->cursor->len;
1327 mateusz.vi 621
    uidirty.from = 0;
622
    uidirty.to = 0xff;
1275 mateusz.vi 623
  } else {
1316 mateusz.vi 624
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 625
  }
626
}
627
 
628
 
1327 mateusz.vi 629
static void cursor_up(struct file *db) {
1422 mateusz.vi 630
  if (db->cursor->prev == NULL) return;
631
 
632
  db->curline -= 1;
633
  db->cursor = db->cursor->prev;
634
  if (db->cursorposy == 0) {
635
    uidirty.from = 0;
636
    uidirty.to = 0xff;
637
  } else {
638
    db->cursorposy -= 1;
1275 mateusz.vi 639
  }
640
}
641
 
642
 
1327 mateusz.vi 643
static void cursor_eol(struct file *db) {
1275 mateusz.vi 644
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 645
  if (db->xoffset > db->cursor->len) {
646
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 647
    uidirty.from = 0;
648
    uidirty.to = 0xff;
1282 mateusz.vi 649
  }
650
 
1427 mateusz.vi 651
  if (db->xoffset + screenlastcol <= db->cursor->len) {
1282 mateusz.vi 652
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 653
    uidirty.from = 0;
654
    uidirty.to = 0xff;
1282 mateusz.vi 655
  }
1316 mateusz.vi 656
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 657
}
658
 
659
 
1327 mateusz.vi 660
static void cursor_down(struct file *db) {
1422 mateusz.vi 661
  if (db->cursor->next == NULL) return;
662
 
663
  db->curline += 1;
664
  db->cursor = db->cursor->next;
665
  if (db->cursorposy < screenh - 2) {
666
    db->cursorposy += 1;
667
  } else {
668
    uidirty.from = 0;
669
    uidirty.to = 0xff;
1276 mateusz.vi 670
  }
671
}
672
 
673
 
1327 mateusz.vi 674
static void cursor_home(struct file *db) {
1316 mateusz.vi 675
  db->cursorposx = 0;
1282 mateusz.vi 676
  if (db->xoffset != 0) {
677
    db->xoffset = 0;
1327 mateusz.vi 678
    uidirty.from = 0;
679
    uidirty.to = 0xff;
1282 mateusz.vi 680
  }
1276 mateusz.vi 681
}
682
 
683
 
1327 mateusz.vi 684
static void cursor_right(struct file *db) {
1316 mateusz.vi 685
  if (db->cursor->len > db->xoffset + db->cursorposx) {
686
    if (db->cursorposx < screenw - 2) {
687
      db->cursorposx += 1;
1308 mateusz.vi 688
    } else {
689
      db->xoffset += 1;
1327 mateusz.vi 690
      uidirty.from = 0;
691
      uidirty.to = 0xff;
1308 mateusz.vi 692
    }
1357 mateusz.vi 693
  } else if (db->cursor->next != NULL) { /* jump to start of next line */
1327 mateusz.vi 694
    cursor_down(db);
695
    cursor_home(db);
1308 mateusz.vi 696
  }
697
}
698
 
699
 
1760 mateusz.vi 700
static void cursor_left(struct file *db) {
701
  if (db->cursorposx > 0) {
702
    db->cursorposx -= 1;
703
  } else if (db->xoffset > 0) {
704
    db->xoffset -= 1;
705
    uidirty.from = 0;
706
    uidirty.to = 0xff;
707
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
708
    cursor_up(db);
709
    cursor_eol(db);
710
  }
711
}
712
 
713
 
1327 mateusz.vi 714
static void del(struct file *db) {
1316 mateusz.vi 715
  if (db->cursorposx + db->xoffset < db->cursor->len) {
1568 mateusz.vi 716
    fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);
1292 mateusz.vi 717
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 718
    uidirty.from = db->cursorposy;
719
    uidirty.to = db->cursorposy;
1393 mateusz.vi 720
    db->modflag = 1;
1292 mateusz.vi 721
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
722
    struct line far *nextline = db->cursor->next;
723
    if (db->cursor->next->len > 0) {
1340 mateusz.vi 724
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
1568 mateusz.vi 725
        fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 726
        db->cursor->len += db->cursor->next->len;
727
      }
728
    }
1340 mateusz.vi 729
 
1292 mateusz.vi 730
    db->cursor->next = db->cursor->next->next;
731
    db->cursor->next->prev = db->cursor;
1340 mateusz.vi 732
 
1339 mateusz.vi 733
    line_free(nextline);
1327 mateusz.vi 734
    uidirty.from = db->cursorposy;
735
    uidirty.to = 0xff;
1328 mateusz.vi 736
    db->totlines -= 1;
1393 mateusz.vi 737
    db->modflag = 1;
1292 mateusz.vi 738
  }
739
}
740
 
741
 
1327 mateusz.vi 742
static void bkspc(struct file *db) {
1302 mateusz.vi 743
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1421 mateusz.vi 744
  if ((db->cursorposx + db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 745
 
1327 mateusz.vi 746
  cursor_left(db);
747
  del(db);
1302 mateusz.vi 748
}
749
 
750
 
1450 mateusz.vi 751
#define LOADFILE_FILENOTFOUND 2
752
 
1346 mateusz.vi 753
/* returns 0 on success, 1 on file not found, 2 on other error */
1449 mateusz.vi 754
static unsigned char loadfile(struct file *db, const char *fname) {
1324 mateusz.vi 755
  char *buffptr;
1556 mateusz.vi 756
  unsigned short len, llen;
757
  unsigned short fd;
1324 mateusz.vi 758
  unsigned char eolfound;
1449 mateusz.vi 759
  unsigned char err = 0;
1287 mateusz.vi 760
 
1355 mateusz.vi 761
  /* free the entire linked list of lines */
762
  db_rewind(db);
763
  while (db->cursor) {
764
    struct line far *victim;
765
    victim = db->cursor;
766
    db->cursor = db->cursor->next;
767
    line_free(victim);
768
  }
1321 mateusz.vi 769
 
1551 mateusz.vi 770
  /* zero out the struct (take care to preserve the id of the slot, though) */
771
  {
772
    unsigned char slotid = db->slotid;
773
    bzero(db, sizeof(struct file));
774
    db->slotid = slotid;
775
  }
1355 mateusz.vi 776
 
1448 mateusz.vi 777
  /* start by adding an empty line */
778
  if (line_add(db, NULL, 0) != 0) return(2);
779
 
1418 mateusz.vi 780
  if (fname == NULL) goto SKIPLOADING;
1321 mateusz.vi 781
 
1543 mateusz.vi 782
  /* make the filename canonical (DOS 3+ only, on earlier versions it just copies the filename) */
783
  mdr_dos_truename(db->fname, fname);
1355 mateusz.vi 784
 
1565 mateusz.vi 785
  /* fopen file */
786
  fd = 0;
787
  _asm {
788
    push cx
789
    push dx
790
 
791
    mov ax, 0x3d00
792
    mov dx, fname   // works only in SMALL memory model!
793
    xor cl, cl
794
    int 0x21
795
    mov fd, ax
796
    jnc done
797
    mov err, al
798
    done:
799
 
800
    pop dx
801
    pop cx
802
  }
803
 
1450 mateusz.vi 804
  if (err != 0) goto SKIPLOADING;
1287 mateusz.vi 805
 
1313 mateusz.vi 806
  db->lfonly = 1;
807
 
1324 mateusz.vi 808
  for (eolfound = 0;;) {
809
    unsigned short consumedbytes;
810
 
1580 mateusz.vi 811
    if ((dos_fread(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
1324 mateusz.vi 812
    buffptr = buff;
813
 
814
    FINDLINE:
815
 
1361 mateusz.vi 816
    /* look for nearest \n (also expand tabs) */
1324 mateusz.vi 817
    for (consumedbytes = 0;; consumedbytes++) {
1361 mateusz.vi 818
 
1773 mateusz.vi 819
      if ((buffptr[consumedbytes] == '\t') && (!glob_tablessmode)) {
1361 mateusz.vi 820
        llen = consumedbytes;
821
        break;
822
      }
823
 
1324 mateusz.vi 824
      if (consumedbytes == len) {
825
        llen = consumedbytes;
826
        break;
1323 mateusz.vi 827
      }
1324 mateusz.vi 828
      if (buffptr[consumedbytes] == '\r') {
829
        llen = consumedbytes;
830
        consumedbytes++;
831
        db->lfonly = 0;
1320 mateusz.vi 832
        break;
833
      }
1324 mateusz.vi 834
      if (buffptr[consumedbytes] == '\n') {
835
        eolfound = 1;
836
        llen = consumedbytes;
837
        consumedbytes++;
838
        break;
839
      }
1287 mateusz.vi 840
    }
1324 mateusz.vi 841
 
842
    /* consumedbytes is the amount of bytes processed from buffptr,
843
     * llen is the length of line's payload (without its line terminator) */
844
 
845
    /* append content, if line is non-empty */
846
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1339 mateusz.vi 847
      goto IOERR;
1287 mateusz.vi 848
    }
849
 
1419 mateusz.vi 850
    /* allocate the next line if current line ended */
1324 mateusz.vi 851
    if (eolfound) {
1328 mateusz.vi 852
      if (line_add(db, NULL, 0) != 0) {
1339 mateusz.vi 853
        goto IOERR;
1324 mateusz.vi 854
      }
855
      eolfound = 0;
856
    }
1287 mateusz.vi 857
 
1759 mateusz.vi 858
    /* tab: append enough spaces to land on next 8-chars boundary */
1412 mateusz.vi 859
    if ((consumedbytes < len) && (buffptr[consumedbytes] == '\t') && (glob_tablessmode == 0)) {
1361 mateusz.vi 860
      consumedbytes++;
1759 mateusz.vi 861
      if (line_append(db, "        ", 8 - (db->cursor->len & 7)) != 0) {
1361 mateusz.vi 862
        goto IOERR;
863
      }
864
    }
865
 
1324 mateusz.vi 866
    /* anything left? process the buffer leftover again */
867
    if (consumedbytes < len) {
868
      len -= consumedbytes;
869
      buffptr += consumedbytes;
870
      goto FINDLINE;
871
    }
872
 
873
  }
874
 
1580 mateusz.vi 875
  dos_fclose(fd);
1287 mateusz.vi 876
 
1321 mateusz.vi 877
  SKIPLOADING:
878
 
1448 mateusz.vi 879
  /* rewind cursor to top of file because it has been used by line_add() */
1339 mateusz.vi 880
  db_rewind(db);
1320 mateusz.vi 881
 
1448 mateusz.vi 882
  return(err);
1339 mateusz.vi 883
 
884
  IOERR:
1580 mateusz.vi 885
  dos_fclose(fd);
1450 mateusz.vi 886
  return(1);
1287 mateusz.vi 887
}
888
 
889
 
1356 mateusz.vi 890
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
891
 * of argc and argv, saves some 330 bytes of binary size
892
 * returns non-zero on error */
893
static int parseargv(struct file *dbarr) {
894
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
895
  unsigned short count = 0;
896
  char *arg;
897
  unsigned short lastarg = 0;
1449 mateusz.vi 898
  unsigned char err;
1356 mateusz.vi 899
 
900
  while (!lastarg) {
901
    /* jump to nearest arg */
902
    while (*tail == ' ') {
903
      *tail = 0;
904
      tail++;
905
    }
906
 
907
    if (*tail == '\r') {
908
      *tail = 0;
909
      break;
910
    }
911
 
912
    arg = tail;
913
 
914
    /* jump to next delimiter */
915
    while ((*tail != ' ') && (*tail != '\r')) tail++;
916
 
917
    /* if \r then remember this is the last arg */
918
    if (*tail == '\r') lastarg = 1;
919
 
920
    *tail = 0;
921
    tail++;
922
 
923
    /* look at the arg now */
924
    if (*arg == '/') {
1412 mateusz.vi 925
      if (arg[1] == 't') { /* /t = do not expand tabs */
926
        glob_tablessmode = 1;
927
 
928
      } else if (arg[1] == 'm') { /* /m = force mono mode */
929
        glob_monomode = 1;
930
 
931
      } else {  /* help screen */
1419 mateusz.vi 932
        mdr_coutraw_str(svarlang_str(1,3)); /* Sved, the SvarDOS editor */
1412 mateusz.vi 933
        mdr_coutraw_str(" [");
1419 mateusz.vi 934
        mdr_coutraw_str(svarlang_str(1,4)); /* ver */
1760 mateusz.vi 935
        mdr_coutraw_str(" " PVER "]\r\n"
936
                         "Copyright (C) " PDATE " Mateusz Viste\n"
937
                         "\r\n"
938
                         "sved [/m] [/t] ");
1412 mateusz.vi 939
        mdr_coutraw_puts(svarlang_str(1,1)); /* args syntax */
940
        mdr_coutraw_crlf();
941
        mdr_coutraw_puts(svarlang_str(1,10)); /* /m */
942
        mdr_coutraw_puts(svarlang_str(1,11)); /* /t */
943
        return(-1);
1387 mateusz.vi 944
      }
1412 mateusz.vi 945
      continue;
1356 mateusz.vi 946
    }
947
 
948
    /* looks to be a filename */
949
    if (count == 10) {
1420 mateusz.vi 950
      mdr_coutraw_puts(svarlang_str(0,12)); /* too many files */
951
      return(-1);
1356 mateusz.vi 952
    }
953
 
954
    /* try loading it */
1387 mateusz.vi 955
    mdr_coutraw_str(svarlang_str(1,2));
956
    mdr_coutraw_char(' ');
1356 mateusz.vi 957
    mdr_coutraw_puts(arg);
958
    err = loadfile(&(dbarr[count]), arg);
959
    if (err) {
1450 mateusz.vi 960
      if (err == LOADFILE_FILENOTFOUND) { /* file not found */
1396 mateusz.vi 961
        if ((count == 0) && (lastarg != 0)) { /* a 'file not found' is fine if only one file was given */
962
          err = 0;
963
        } else {
964
          err = 11;
965
        }
1356 mateusz.vi 966
      } else { /* general error */
967
        err = 10;
968
      }
1396 mateusz.vi 969
      if (err) {
970
        mdr_coutraw_puts(svarlang_str(0,err));
971
        return(-1);
972
      }
1356 mateusz.vi 973
    }
974
    count++;
975
  }
976
 
977
  return(0);
978
}
979
 
980
 
1327 mateusz.vi 981
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1340 mateusz.vi 982
  if (curline_resize(db, db->cursor->len + len) == 0) {
1317 mateusz.vi 983
    unsigned short off = db->xoffset + db->cursorposx;
1393 mateusz.vi 984
    db->modflag = 1;
1568 mateusz.vi 985
    fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
1317 mateusz.vi 986
    db->cursor->len += len;
1327 mateusz.vi 987
    uidirty.from = db->cursorposy;
988
    uidirty.to = db->cursorposy;
1317 mateusz.vi 989
    while (len--) {
990
      db->cursor->payload[off++] = *databuf;
991
      databuf++;
1327 mateusz.vi 992
      cursor_right(db);
1317 mateusz.vi 993
    }
994
  }
995
}
996
 
997
 
1343 mateusz.vi 998
/* recompute db->curline by counting nodes in linked list */
999
static void recompute_curline(struct file *db) {
1000
  const struct line far *l = db->cursor;
1001
 
1002
  db->curline = 0;
1003
  while (l->prev != NULL) {
1004
    db->curline += 1;
1005
    l = l->prev;
1006
  }
1007
}
1008
 
1009
 
1354 mateusz.vi 1010
enum MENU_ACTION {
1393 mateusz.vi 1011
  MENU_NONE   = 0,
1012
  MENU_OPEN   = 1,
1013
  MENU_SAVE   = 2,
1014
  MENU_SAVEAS = 3,
1015
  MENU_CLOSE  = 4,
1016
  MENU_CHGEOL = 5,
1418 mateusz.vi 1017
  MENU_QUIT   = 6
1354 mateusz.vi 1018
};
1019
 
1020
static enum MENU_ACTION ui_menu(void) {
1021
  unsigned short i, curchoice, attr, x, slen;
1393 mateusz.vi 1022
  unsigned short xorigin, yorigin;
1354 mateusz.vi 1023
 
1024
  /* find out the longest string */
1025
  slen = 0;
1355 mateusz.vi 1026
  for (i = MENU_OPEN; i <= MENU_QUIT; i++) {
1354 mateusz.vi 1027
    x = strlen(svarlang_str(8, i));
1028
    if (x > slen) slen = x;
1029
  }
1030
 
1393 mateusz.vi 1031
  /* calculate where to draw the menu on screen */
1032
  xorigin = (screenw - (slen + 5)) / 2;
1395 mateusz.vi 1033
  yorigin = (screenh - (MENU_QUIT - MENU_OPEN + 6)) / 2;
1393 mateusz.vi 1034
 
1395 mateusz.vi 1035
  /* */
1036
  uidirty.from = yorigin;
1037
  uidirty.to = 0xff;
1038
  uidirty.statusbar = 1;
1039
 
1040
  /* hide the cursor */
1041
  mdr_cout_cursor_hide();
1042
 
1355 mateusz.vi 1043
  curchoice = MENU_OPEN;
1354 mateusz.vi 1044
  for (;;) {
1045
    /* render menu */
1393 mateusz.vi 1046
    for (i = MENU_NONE; i <= MENU_QUIT + 1; i++) {
1047
      mdr_cout_char_rep(yorigin + i, xorigin, ' ', SCHEME_MENU, slen+4);
1354 mateusz.vi 1048
      if (i == curchoice) {
1049
        attr = SCHEME_MENU_CUR;
1415 mateusz.vi 1050
        mdr_cout_char_rep(yorigin + i, xorigin + 1, ' ', SCHEME_MENU_SEL, slen + 2);
1354 mateusz.vi 1051
      } else {
1052
        attr = SCHEME_MENU;
1053
      }
1416 mateusz.vi 1054
      mdr_cout_str(yorigin + i, xorigin + 2, svarlang_str(8, i), attr, slen);
1354 mateusz.vi 1055
    }
1056
    /* wait for key */
1410 mateusz.vi 1057
    switch (mdr_dos_getkey2()) {
1354 mateusz.vi 1058
      case 0x150: /* down */
1059
        if (curchoice == MENU_QUIT) {
1355 mateusz.vi 1060
          curchoice = MENU_OPEN;
1354 mateusz.vi 1061
        } else {
1062
          curchoice++;
1063
        }
1064
        break;
1065
      case 0x148: /* up */
1355 mateusz.vi 1066
        if (curchoice == MENU_OPEN) {
1354 mateusz.vi 1067
          curchoice = MENU_QUIT;
1068
        } else {
1069
          curchoice--;
1070
        }
1071
        break;
1395 mateusz.vi 1072
      default:
1073
        curchoice = MENU_NONE;
1074
        /* FALLTHRU */
1075
      case '\r': /* ENTER */
1076
        mdr_cout_cursor_show();
1077
        return(curchoice);
1354 mateusz.vi 1078
    }
1079
  }
1080
}
1081
 
1082
 
1760 mateusz.vi 1083
static void new_slot_selected(const struct file *dbarr) {
1355 mateusz.vi 1084
  uidirty.from = 0;
1085
  uidirty.to = 0xff;
1086
  uidirty.statusbar = 1;
1087
 
1415 mateusz.vi 1088
  /* force redraw now, because the main() routine might not if this is exit
1089
   * time and we want to show the user which file has unsaved changes */
1549 mateusz.vi 1090
  ui_statusbar(dbarr);
1355 mateusz.vi 1091
  ui_refresh(dbarr);
1092
}
1093
 
1094
 
1347 mateusz.vi 1095
/* main returns nothing, ie. sved always exits with a zero exit code
1096
 * (this saves 20 bytes of executable footprint) */
1097
void main(void) {
1355 mateusz.vi 1098
  static struct file dbarr[10];
1099
  struct file *db = dbarr; /* visible file is the first slot by default */
1548 mateusz.vi 1100
  static struct line far *clipboard;
1538 mateusz.vi 1101
  static unsigned char original_breakflag;
1275 mateusz.vi 1102
 
1418 mateusz.vi 1103
  { /* load NLS resource */
1364 mateusz.vi 1104
    unsigned short i = 0;
1105
    const char far *selfptr;
1548 mateusz.vi 1106
    char lang[8];
1364 mateusz.vi 1107
    selfptr = mdr_dos_selfexe();
1108
    if (selfptr != NULL) {
1109
      do {
1548 mateusz.vi 1110
        buff[i] = selfptr[i];
1111
      } while (buff[i++] != 0);
1112
      svarlang_autoload_exepath(buff, mdr_dos_getenv(lang, "LANG", sizeof(lang)));
1364 mateusz.vi 1113
    }
1307 mateusz.vi 1114
  }
1282 mateusz.vi 1115
 
1355 mateusz.vi 1116
  /* preload all slots with empty files */
1549 mateusz.vi 1117
  {
1118
    unsigned short i;
1119
    for (i = 0; i < 10; i++) {
1120
      loadfile(&(dbarr[i]), NULL);
1121
      dbarr[i].slotid = i;
1122
    }
1355 mateusz.vi 1123
  }
1124
 
1356 mateusz.vi 1125
  /* parse argv (and load files, if any passed on) */
1126
  if (parseargv(dbarr) != 0) return;
1282 mateusz.vi 1127
 
1412 mateusz.vi 1128
  if ((mdr_cout_init(&screenw, &screenh) != 0) && (glob_monomode == 0)) {
1333 mateusz.vi 1129
    /* load color scheme if mdr_cout_init returns a color flag */
1130
    SCHEME_TEXT = 0x17;
1354 mateusz.vi 1131
    SCHEME_MENU = 0x70;
1388 mateusz.vi 1132
    SCHEME_MENU_CUR = 0x6f;
1133
    SCHEME_MENU_SEL = 0x66;
1333 mateusz.vi 1134
    SCHEME_STBAR1 = 0x70;
1135
    SCHEME_STBAR2 = 0x78;
1392 mateusz.vi 1136
    SCHEME_STBAR3 = 0x3f;
1333 mateusz.vi 1137
    SCHEME_SCROLL = 0x70;
1388 mateusz.vi 1138
    SCHEME_MSG = 0x6f;
1333 mateusz.vi 1139
    SCHEME_ERR = 0x4f;
1140
  }
1427 mateusz.vi 1141
  screenlastrow = screenh - 1;
1142
  screenlastcol = screenw - 1;
1275 mateusz.vi 1143
 
1414 mateusz.vi 1144
  /* instruct DOS to stop detecting CTRL+C because user needs it for
1145
   * copy/paste operations. also remember the original status of the BREAK
1146
   * flag so I can restore it as it was before quitting. */
1147
  original_breakflag = mdr_dos_ctrlc_disable();
1410 mateusz.vi 1148
 
1275 mateusz.vi 1149
  for (;;) {
1150
    int k;
1151
 
1362 mateusz.vi 1152
    /* add an extra empty line if cursor is on last line and this line is not empty */
1153
    if ((db->cursor->next == NULL) && (db->cursor->len != 0)) {
1154
      if (line_add(db, NULL, 0) == 0) {
1155
        db->cursor = db->cursor->prev; /* line_add() changes the cursor pointer */
1437 mateusz.vi 1156
        db->curline -= 1;
1362 mateusz.vi 1157
      }
1158
    }
1159
 
1327 mateusz.vi 1160
    check_cursor_not_after_eol(db);
1320 mateusz.vi 1161
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 1162
 
1392 mateusz.vi 1163
    ui_refresh(db);
1164
 
1436 mateusz.vi 1165
    if ((uidirty.statusbar != 0) || (db->modflagprev != db->modflag) || (db->curline_prev != db->curline)) {
1549 mateusz.vi 1166
      ui_statusbar(db);
1342 mateusz.vi 1167
      uidirty.statusbar = 0;
1355 mateusz.vi 1168
      db->modflagprev = db->modflag;
1436 mateusz.vi 1169
      db->curline_prev = db->curline;
1342 mateusz.vi 1170
    }
1328 mateusz.vi 1171
#ifdef DBG_LINENUM
1172
      {
1173
        char ddd[10];
1174
        db->curline += 1;
1175
        ddd[0] = '0' + db->curline / 100;
1176
        ddd[1] = '0' + (db->curline % 100) / 10;
1177
        ddd[2] = '0' + (db->curline % 10);
1178
        db->curline -= 1;
1179
        ddd[3] = '/';
1180
        ddd[4] = '0' + db->totlines / 100;
1181
        ddd[5] = '0' + (db->totlines % 100) / 10;
1182
        ddd[6] = '0' + (db->totlines % 10);
1183
        ddd[7] = 0;
1333 mateusz.vi 1184
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 1185
      }
1186
#endif
1275 mateusz.vi 1187
 
1410 mateusz.vi 1188
    k = mdr_dos_getkey2();
1282 mateusz.vi 1189
 
1275 mateusz.vi 1190
    if (k == 0x150) { /* down */
1327 mateusz.vi 1191
      cursor_down(db);
1275 mateusz.vi 1192
 
1193
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 1194
      cursor_up(db);
1275 mateusz.vi 1195
 
1196
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 1197
      cursor_right(db);
1275 mateusz.vi 1198
 
1199
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 1200
      cursor_left(db);
1275 mateusz.vi 1201
 
1282 mateusz.vi 1202
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 1203
      unsigned char dist = db->cursorposy + screenh - 1;
1204
      while ((dist != 0) && (db->cursor->prev != NULL)) {
1205
        db->cursor = db->cursor->prev;
1206
        dist--;
1207
      }
1208
      if (dist != 0) {
1209
        db->cursorposy = 0;
1210
        db->cursorposx = 0;
1211
      } else {
1212
        dist = db->cursorposy;
1213
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
1214
      }
1215
      uidirty.from = 0;
1216
      uidirty.to = 0xff;
1343 mateusz.vi 1217
      recompute_curline(db);
1282 mateusz.vi 1218
 
1219
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 1220
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
1221
      while ((dist != 0) && (db->cursor->next != NULL)) {
1222
        db->cursor = db->cursor->next;
1223
        dist--;
1224
      }
1225
      if (dist != 0) {
1226
        db->cursorposy = screenh - 2;
1227
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
1228
        db->cursorposx = 0;
1229
      } else {
1230
        dist = screenh - 2 - db->cursorposy;
1231
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
1232
      }
1233
      uidirty.from = 0;
1234
      uidirty.to = 0xff;
1343 mateusz.vi 1235
      recompute_curline(db);
1282 mateusz.vi 1236
 
1237
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 1238
       cursor_home(db);
1282 mateusz.vi 1239
 
1240
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 1241
       cursor_eol(db);
1282 mateusz.vi 1242
 
1275 mateusz.vi 1243
    } else if (k == 0x1B) { /* ESC */
1354 mateusz.vi 1244
      int quitnow = 0;
1394 mateusz.vi 1245
      char fname[64];
1354 mateusz.vi 1246
      int saveflag = 0;
1393 mateusz.vi 1247
      enum MENU_ACTION ui_action;
1275 mateusz.vi 1248
 
1392 mateusz.vi 1249
      /* collect the exact menu action and clear the screen */
1250
      ui_action = ui_menu();
1251
      ui_refresh(db);
1354 mateusz.vi 1252
 
1392 mateusz.vi 1253
      switch (ui_action) {
1254
 
1354 mateusz.vi 1255
        case MENU_NONE:
1256
          break;
1257
 
1258
        case MENU_OPEN:
1259
          /* display a warning if unsaved changes are pending */
1547 mateusz.vi 1260
          if (db->modflag != 0) ui_msg(4, 8, 0, SCHEME_MSG);
1354 mateusz.vi 1261
 
1262
          /* ask for filename */
1263
          ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
1264
          if (fname[0] != 0) {
1449 mateusz.vi 1265
            unsigned char err;
1354 mateusz.vi 1266
            err = loadfile(db, fname);
1267
            if (err != 0) {
1450 mateusz.vi 1268
              if (err == LOADFILE_FILENOTFOUND) {
1547 mateusz.vi 1269
                ui_msg(11, 0, 0, SCHEME_ERR); /* file not found */
1354 mateusz.vi 1270
              } else {
1547 mateusz.vi 1271
                ui_msg(10, 0, 0, SCHEME_ERR);  /* ERROR */
1354 mateusz.vi 1272
              }
1273
              mdr_bios_tickswait(44); /* 3s */
1418 mateusz.vi 1274
              loadfile(db, NULL);
1354 mateusz.vi 1275
            }
1276
          }
1393 mateusz.vi 1277
          uidirty.from = 0;
1278
          uidirty.to = 0xff;
1279
          uidirty.statusbar = 1;
1354 mateusz.vi 1280
          break;
1281
 
1282
        case MENU_SAVEAS:
1283
          saveflag = 1;
1284
          /* FALLTHRU */
1285
        case MENU_SAVE:
1286
          if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
1287
            ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
1288
            if (*fname == 0) break;
1289
            saveflag = savefile(db, fname);
1290
          } else {
1291
            saveflag = savefile(db, NULL);
1292
          }
1293
 
1395 mateusz.vi 1294
          mdr_cout_cursor_hide();
1295
 
1354 mateusz.vi 1296
          if (saveflag == 0) {
1547 mateusz.vi 1297
            ui_msg(2, 0, 0, SCHEME_MSG);
1354 mateusz.vi 1298
            mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
1299
          } else {
1547 mateusz.vi 1300
            ui_msg(10, 0, 0, SCHEME_ERR);
1354 mateusz.vi 1301
            mdr_bios_tickswait(36); /* 2s */
1302
          }
1395 mateusz.vi 1303
          mdr_cout_cursor_show();
1354 mateusz.vi 1304
          break;
1305
 
1355 mateusz.vi 1306
        case MENU_CLOSE:
1307
          if (ui_confirm_if_unsaved(db) == 0) {
1418 mateusz.vi 1308
            loadfile(db, NULL);
1355 mateusz.vi 1309
          }
1310
          uidirty.from = 0;
1311
          uidirty.to = 0xff;
1312
          uidirty.statusbar = 1;
1313
          break;
1314
 
1354 mateusz.vi 1315
        case MENU_CHGEOL:
1393 mateusz.vi 1316
          db->modflag = 1;
1354 mateusz.vi 1317
          db->lfonly ^= 1;
1318
          break;
1319
 
1320
        case MENU_QUIT:
1355 mateusz.vi 1321
          quitnow = 1;
1549 mateusz.vi 1322
          {
1323
            unsigned short curfile;
1324
            for (curfile = 0; curfile < 10; curfile++) {
1325
              if (dbarr[curfile].modflag == 0) continue; /* skip unmodified slots */
1760 mateusz.vi 1326
              db = dbarr + curfile;
1327
              new_slot_selected(db);
1441 mateusz.vi 1328
              if (ui_confirm_if_unsaved(db) != 0) {
1329
                quitnow = 0;
1330
                break;
1331
              }
1355 mateusz.vi 1332
            }
1333
          }
1354 mateusz.vi 1334
          break;
1335
      }
1336
 
1337
      if (quitnow) break;
1338
 
1289 mateusz.vi 1339
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 1340
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 1341
      /* add a new line */
1328 mateusz.vi 1342
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1393 mateusz.vi 1343
        db->modflag = 1;
1328 mateusz.vi 1344
        db->cursor = db->cursor->prev; /* back to original line */
1427 mateusz.vi 1345
        db->curline -= 1;
1289 mateusz.vi 1346
        /* trim the line above */
1328 mateusz.vi 1347
        db->cursor->len = off;
1289 mateusz.vi 1348
        /* move cursor to the (new) line below */
1328 mateusz.vi 1349
        uidirty.from = db->cursorposy;
1327 mateusz.vi 1350
        uidirty.to = 0xff;
1328 mateusz.vi 1351
        cursor_down(db);
1352
        cursor_home(db);
1289 mateusz.vi 1353
      } else {
1354
        /* ERROR: OUT OF MEMORY */
1355
      }
1356
 
1292 mateusz.vi 1357
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 1358
      del(db);
1292 mateusz.vi 1359
 
1302 mateusz.vi 1360
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 1361
      bkspc(db);
1302 mateusz.vi 1362
 
1308 mateusz.vi 1363
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 1364
      char c = k;
1327 mateusz.vi 1365
      insert_in_line(db, &c, 1);
1308 mateusz.vi 1366
 
1759 mateusz.vi 1367
    } else if (k == 0x009) { /* TAB: fill blanks to next 8-chars boundary */
1412 mateusz.vi 1368
      if (glob_tablessmode == 0) {
1759 mateusz.vi 1369
        insert_in_line(db, "        ", 8 - ((db->xoffset + db->cursorposx) & 7));
1412 mateusz.vi 1370
      } else {
1371
        insert_in_line(db, "\t", 1);
1372
      }
1317 mateusz.vi 1373
 
1355 mateusz.vi 1374
    } else if ((k >= 0x13b) && (k <= 0x144)) { /* F1..F10 */
1760 mateusz.vi 1375
      db = dbarr + (k - 0x13b);
1376
      new_slot_selected(db);
1309 mateusz.vi 1377
 
1325 mateusz.vi 1378
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
1379
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
1380
      for (;;) {
1381
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
1382
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 1383
        cursor_right(db);
1325 mateusz.vi 1384
      }
1385
      /* now skip to next non-space or end of file */
1386
      for (;;) {
1327 mateusz.vi 1387
        cursor_right(db);
1325 mateusz.vi 1388
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1389
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
1390
      }
1391
 
1392
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 1393
      cursor_left(db);
1325 mateusz.vi 1394
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
1395
      for (;;) {
1396
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
1397
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 1398
        cursor_left(db);
1325 mateusz.vi 1399
      }
1400
      /* now skip to next space or start of file */
1401
      for (;;) {
1327 mateusz.vi 1402
        cursor_left(db);
1325 mateusz.vi 1403
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 1404
          cursor_right(db);
1325 mateusz.vi 1405
          break;
1406
        }
1407
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
1408
      }
1409
 
1410 mateusz.vi 1410
    } else if ((k == 0x003) || (k == 0x018)) { /* CTRL+C or CTRL+X */
1411
      /* free clipboard if anything in it */
1412
      if (clipboard != NULL) line_free(clipboard);
1413
 
1414
      /* copy cursor line to clipboard */
1415
      clipboard = line_calloc(db->cursor->len);
1416
      if (clipboard == NULL) {
1547 mateusz.vi 1417
        ui_msg(10, 0, 0, SCHEME_ERR); /* ERROR */
1410 mateusz.vi 1418
        mdr_bios_tickswait(18); /* 1s */
1419
      } else {
1427 mateusz.vi 1420
        mdr_cout_char_rep(db->cursorposy, 0, ' ', ((SCHEME_TEXT >> 4) | (SCHEME_TEXT << 4)) & 0xff, screenlastcol);
1410 mateusz.vi 1421
        uidirty.from = db->cursorposy;
1422
        uidirty.to = db->cursorposy;
1423
        if (db->cursor->len != 0) {
1568 mateusz.vi 1424
          fmemmove(clipboard->payload, db->cursor->payload, db->cursor->len);
1410 mateusz.vi 1425
          clipboard->len = db->cursor->len;
1426
        }
1427
        mdr_bios_tickswait(2); /* ca 100ms */
1428
 
1429
        /* if this is about cutting the line (CTRL+X) then delete cur line */
1430
        if ((k == 0x018) && ((db->cursor->next != NULL) || (db->cursor->prev != NULL))) {
1431
          if (db->cursor->next) db->cursor->next->prev = db->cursor->prev;
1432
          if (db->cursor->prev) db->cursor->prev->next = db->cursor->next;
1433
          clipboard->prev = db->cursor;
1434
          if (db->cursor->next) {
1435
            db->cursor = db->cursor->next;
1436
          } else {
1437
            cursor_up(db);
1438
          }
1439
          line_free(clipboard->prev);
1423 mateusz.vi 1440
          db->totlines -= 1;
1552 mateusz.vi 1441
          db->modflag = 1;
1410 mateusz.vi 1442
          uidirty.from = 0;
1443
          uidirty.to = 0xff;
1412 mateusz.vi 1444
          recompute_curline(db);
1410 mateusz.vi 1445
        }
1446
      }
1447
 
1420 mateusz.vi 1448
    } else if ((k == 0x016) && (clipboard != NULL)) { /* CTRL+V */
1449
      if (line_add(db, clipboard->payload, clipboard->len) != 0) {
1547 mateusz.vi 1450
        ui_msg(10, 0, 0, SCHEME_ERR); /* ERROR */
1420 mateusz.vi 1451
        mdr_bios_tickswait(18); /* 1s */
1452
      } else {
1453
        /* rewire the linked list so the new line is on top of the previous one */
1454
        clipboard->prev = db->cursor->prev;
1455
        /* remove prev node from list */
1456
        db->cursor->prev = db->cursor->prev->prev;
1457
        if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor;
1458
        /* insert the node after cursor now */
1459
        clipboard->prev->next = db->cursor->next;
1460
        if (db->cursor->next != NULL) db->cursor->next->prev = clipboard->prev;
1461
        clipboard->prev->prev = db->cursor;
1462
        db->cursor->next = clipboard->prev;
1463
        cursor_down(db);
1552 mateusz.vi 1464
        db->modflag = 1;
1410 mateusz.vi 1465
      }
1466
      uidirty.from = 0;
1467
      uidirty.to = 0xff;
1412 mateusz.vi 1468
      recompute_curline(db);
1410 mateusz.vi 1469
 
1333 mateusz.vi 1470
#ifdef DBG_UNHKEYS
1282 mateusz.vi 1471
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
1472
      char buff[4];
1473
      const char *HEX = "0123456789ABCDEF";
1474
      buff[0] = HEX[(k >> 8) & 15];
1475
      buff[1] = HEX[(k >> 4) & 15];
1476
      buff[2] = HEX[k & 15];
1333 mateusz.vi 1477
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
1478
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1410 mateusz.vi 1479
      mdr_dos_getkey2();
1275 mateusz.vi 1480
      break;
1333 mateusz.vi 1481
#endif
1275 mateusz.vi 1482
    }
1483
  }
1484
 
1485
  mdr_cout_close();
1486
 
1414 mateusz.vi 1487
  /* restore the DOS BREAK flag if it was originally set */
1488
  if (original_breakflag != 0) mdr_dos_ctrlc_enable();
1489
 
1320 mateusz.vi 1490
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 1491
 
1347 mateusz.vi 1492
  return;
1275 mateusz.vi 1493
}