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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
 
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
 
1537 mateusz.vi 35
#define PVER "2023.5"
1356 mateusz.vi 36
#define PDATE "2023"
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
 
1572 mateusz.vi 96
unsigned short dosalloc(unsigned short siz);
97
 
98
#pragma aux dosalloc = \
99
"mov ah, 0x48" \
100
"int 0x21" \
101
"jnc done" \
102
"xor ax, ax" \
103
"done:" \
104
parm [bx] \
105
value [ax];
106
 
107
 
108
unsigned short dosfree(unsigned short segn);
109
 
110
#pragma aux dosfree = \
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
 
1573 mateusz.vi 120
unsigned short dosfclose(unsigned short handle);
1572 mateusz.vi 121
 
1573 mateusz.vi 122
#pragma aux dosfclose = \
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
 
1574 mateusz.vi 132
unsigned short dosfread(unsigned short handle, void *buf, unsigned short count, unsigned short *bytes);
1573 mateusz.vi 133
 
1574 mateusz.vi 134
#pragma aux dosfread = \
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
 
1578 mateusz.vi 157
unsigned short dos_write(unsigned short handle, unsigned short count, unsigned short *bytes, const void far *buf);
158
/* NOTE: last parameter (far pointer buf) is passed on the stack */
159
#pragma aux dos_write = \
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
 
1572 mateusz.vi 218
  seg = dosalloc((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) {
1572 mateusz.vi 230
  dosfree(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 ax
357
    push cx
358
    push dx
359
 
360
    mov ah, 0x3C    /* create or truncate file */
361
    xor cx, cx      /* file attributes */
362
    mov dx, saveas  /* works only in SMALL/TINY mode */
363
    int 0x21
364
    jnc DONE
365
    mov errflag, ax
366
    DONE:
367
    mov fd, ax
368
 
369
    pop dx
370
    pop cx
371
    pop ax
372
  }
373
 
374
  if (errflag != 0) return(-1);
375
 
376
  l = db->cursor;
377
  while (l->prev) l = l->prev;
378
 
379
  /* preset line terminators */
380
  if (db->lfonly) {
381
    eolbuf++;
382
    eollen--;
383
  }
384
 
385
  while (l) {
386
    /* do not write the last empty line, it is only useful for edition */
387
    if (l->len != 0) {
1578 mateusz.vi 388
      errflag |= dos_write(fd, l->len, &bytes, l->payload);
1539 mateusz.vi 389
    } else if (l->next == NULL) {
390
      break;
391
    }
1578 mateusz.vi 392
    errflag |= dos_write(fd, eollen, &bytes, eolbuf);
1539 mateusz.vi 393
    l = l->next;
394
  }
395
 
1573 mateusz.vi 396
  errflag |= dosfclose(fd);
1539 mateusz.vi 397
 
1541 mateusz.vi 398
  /* did it all work? */
399
  if (errflag == 0) {
400
    db->modflag = 0;
401
    if (saveas != db->fname) mdr_dos_truename(db->fname, saveas);
402
  }
403
 
1539 mateusz.vi 404
  return(errflag);
405
}
406
 
407
 
1549 mateusz.vi 408
static void ui_statusbar(const struct file *db) {
1356 mateusz.vi 409
  const char *s = svarlang_strid(0); /* ESC=MENU */
1348 mateusz.vi 410
  unsigned short helpcol = screenw - strlen(s);
1440 mateusz.vi 411
  unsigned short col;
1275 mateusz.vi 412
 
1425 mateusz.vi 413
  /* slot number (guaranteed to be 0-9) */
1355 mateusz.vi 414
  {
415
    char slot[4] = "#00";
1549 mateusz.vi 416
    if (db->slotid == 9) {
1425 mateusz.vi 417
      slot[1] = '1';
418
    } else {
1549 mateusz.vi 419
      slot[2] += db->slotid + 1;
1425 mateusz.vi 420
    }
1427 mateusz.vi 421
    mdr_cout_str(screenlastrow, 0, slot, SCHEME_STBAR2, 3);
1355 mateusz.vi 422
  }
1313 mateusz.vi 423
 
1355 mateusz.vi 424
  /* fill rest of status bar with background */
1427 mateusz.vi 425
  mdr_cout_char_rep(screenlastrow, 3, ' ', SCHEME_STBAR1, helpcol - 3);
1355 mateusz.vi 426
 
1313 mateusz.vi 427
  /* eol type */
1330 mateusz.vi 428
  {
429
    const char *eoltype = "CRLF";
1353 mateusz.vi 430
    if (db->lfonly) eoltype += 2;
1440 mateusz.vi 431
    mdr_cout_str(screenlastrow, helpcol - 5, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 432
  }
1313 mateusz.vi 433
 
1438 mateusz.vi 434
  /* line numbers */
1436 mateusz.vi 435
  {
1438 mateusz.vi 436
    unsigned short x;
437
    unsigned char count = 0;
1440 mateusz.vi 438
    col = helpcol - 7;
1438 mateusz.vi 439
 
1439 mateusz.vi 440
    x = db->totlines;
1438 mateusz.vi 441
    AGAIN:
1436 mateusz.vi 442
    do {
1439 mateusz.vi 443
      mdr_cout_char(screenlastrow, col--, '0' + (x % 10), SCHEME_STBAR1);
1436 mateusz.vi 444
      x /= 10;
445
    } while (x);
1438 mateusz.vi 446
    /* redo same exercise, but printing the current line now */
447
    if (count == 0) {
448
      count = 1;
1439 mateusz.vi 449
      mdr_cout_char(screenlastrow, col--, '/', SCHEME_STBAR1);
1438 mateusz.vi 450
      x = 1 + db->curline;
451
      goto AGAIN;
452
    }
1440 mateusz.vi 453
  }
1438 mateusz.vi 454
 
1440 mateusz.vi 455
  /* filename and modflag */
456
  {
457
    const char *fn;
458
    unsigned short x;
459
    unsigned short maxfnlen = col - 6;
460
    if (db->fname[0] == 0) {
461
      fn = svarlang_str(0, 1); /* "UNTITLED" */
462
    } else {
463
      /* display filename up to maxfnlen chars */
464
      fn = db->fname;
465
      x = strlen(fn);
466
      if (x > maxfnlen) fn += x - maxfnlen;
467
    }
468
    x = mdr_cout_str(screenlastrow, 4, fn, SCHEME_STBAR1, maxfnlen);
469
    if (db->modflag) mdr_cout_char(screenlastrow, 5 + x, '!', SCHEME_STBAR2);
1436 mateusz.vi 470
  }
471
 
1427 mateusz.vi 472
  mdr_cout_str(screenlastrow, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 473
}
474
 
475
 
1547 mateusz.vi 476
static void ui_msg(unsigned short msgid1, unsigned short msgid2, unsigned short msgid3, unsigned char attr) {
477
  unsigned short x, y, maxmsglen, i;
478
  unsigned short msgcount = 1;
479
  const char *msg[3];
1331 mateusz.vi 480
 
1547 mateusz.vi 481
  msg[0] = svarlang_strid(msgid1);
482
 
483
  if (msgid2 != 0) {
484
    msgcount = 2;
485
    msg[1] = svarlang_strid(msgid2);
1331 mateusz.vi 486
  }
1547 mateusz.vi 487
  if (msgid3 != 0) {
488
    msgcount = 3;
489
    msg[2] = svarlang_strid(msgid3);
490
  }
1331 mateusz.vi 491
 
1547 mateusz.vi 492
  /* find longest msg */
493
  maxmsglen = 0;
494
  for (i = 0; i < msgcount; i++) {
495
    y = strlen(msg[i]);
496
    if (y > maxmsglen) maxmsglen = y;
497
  }
498
 
1331 mateusz.vi 499
  y = (screenh - 6) >> 1;
1547 mateusz.vi 500
  x = (screenw - maxmsglen - 3) >> 1;
501
  for (i = y+1+msgcount; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, maxmsglen + 2);
1331 mateusz.vi 502
  x++;
1345 mateusz.vi 503
 
1547 mateusz.vi 504
  for (i = 0; i < msgcount; i++) {
505
    mdr_cout_str(y+1+i, x, msg[i], attr, maxmsglen);
506
  }
1312 mateusz.vi 507
 
1327 mateusz.vi 508
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 509
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 510
}
511
 
512
 
1539 mateusz.vi 513
/* returns 0 if operation may proceed, non-zero to cancel */
1541 mateusz.vi 514
static unsigned char ui_confirm_if_unsaved(struct file *db) {
1539 mateusz.vi 515
  int k;
516
 
1342 mateusz.vi 517
  if (db->modflag == 0) return(0);
518
 
1355 mateusz.vi 519
  mdr_cout_cursor_hide();
520
 
1539 mateusz.vi 521
  /* if file has been modified then ask for confirmation:
522
   * ENTER        : agree to data loss
523
   * SPACE        : SAVE file before quit (only if valid filename present)
524
   * anything else: ABORT */
1547 mateusz.vi 525
  ui_msg(4, 5, (db->fname[0])?9:8, SCHEME_MSG);
1342 mateusz.vi 526
 
1539 mateusz.vi 527
  k = mdr_dos_getkey2();
1355 mateusz.vi 528
  mdr_cout_cursor_show();
529
 
1539 mateusz.vi 530
  /* ENTER = agree to loose unsaved data */
531
  if (k == '\r') return(0);
532
 
533
  /* SPACE = save file and continue */
534
  if ((k == ' ') && (db->fname[0] != 0) && (savefile(db, NULL) == 0)) return(0);
535
 
536
  /* any other key = cancel operation */
537
  return(1);
1342 mateusz.vi 538
}
539
 
540
 
1327 mateusz.vi 541
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 542
  unsigned char x;
1310 mateusz.vi 543
  const struct line far *l;
1316 mateusz.vi 544
  unsigned char y = db->cursorposy;
1275 mateusz.vi 545
 
1392 mateusz.vi 546
  /* quit early if nothing to refresh */
547
  if (uidirty.from == 0xff) return;
548
 
1288 mateusz.vi 549
#ifdef DBG_REFRESH
1282 mateusz.vi 550
  static char m = 'a';
551
  m++;
552
  if (m > 'z') m = 'a';
1288 mateusz.vi 553
#endif
1282 mateusz.vi 554
 
1310 mateusz.vi 555
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 556
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 557
 
1310 mateusz.vi 558
  /* iterate over lines and redraw whatever needs to be redrawn */
559
  for (; l != NULL; l = l->next, y++) {
560
 
561
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 562
    if (y < uidirty.from) continue;
563
    if (y > uidirty.to) break;
1282 mateusz.vi 564
 
1318 mateusz.vi 565
    x = 0;
1275 mateusz.vi 566
    if (db->xoffset < l->len) {
1318 mateusz.vi 567
      unsigned char i, limit;
568
      if (l->len - db->xoffset < screenw) {
569
        limit = l->len;
570
      } else {
1427 mateusz.vi 571
        limit = db->xoffset + screenlastcol;
1318 mateusz.vi 572
      }
1333 mateusz.vi 573
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 574
    }
1282 mateusz.vi 575
 
1318 mateusz.vi 576
    /* write empty spaces until end of line */
1427 mateusz.vi 577
    if (x < screenlastcol) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenlastcol - x);
1318 mateusz.vi 578
 
1288 mateusz.vi 579
#ifdef DBG_REFRESH
1333 mateusz.vi 580
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 581
#endif
1282 mateusz.vi 582
 
1275 mateusz.vi 583
    if (y == screenh - 2) break;
584
  }
1310 mateusz.vi 585
 
1319 mateusz.vi 586
  /* fill all lines below if empty (and they need to be redrawn) */
587
  if (l == NULL) {
1427 mateusz.vi 588
    while ((y < screenlastrow) && (y < uidirty.to)) {
589
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenlastcol);
1319 mateusz.vi 590
    }
1318 mateusz.vi 591
  }
1328 mateusz.vi 592
 
593
  /* scroll bar */
1427 mateusz.vi 594
  for (y = 0; y < screenlastrow; y++) {
595
    mdr_cout_char(y, screenlastcol, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 596
  }
597
 
598
  /* scroll cursor */
599
  if (db->totlines >= screenh) {
600
    unsigned short topline = db->curline - db->cursorposy;
601
    unsigned short col;
602
    unsigned short totlines = db->totlines - screenh + 1;
603
    if (db->totlines - screenh > screenh) {
1427 mateusz.vi 604
      col = topline / (totlines / screenlastrow);
1328 mateusz.vi 605
    } else {
1427 mateusz.vi 606
      col = topline * screenlastrow / totlines;
1328 mateusz.vi 607
    }
1427 mateusz.vi 608
    if (col >= screenlastrow) col = screenh - 2;
609
    mdr_cout_char(col, screenlastcol, ' ', SCHEME_SCROLL);
1328 mateusz.vi 610
  }
1392 mateusz.vi 611
 
612
  /* clear out the dirty flag */
613
  uidirty.from = 0xff;
1275 mateusz.vi 614
}
615
 
616
 
1327 mateusz.vi 617
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 618
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 619
 
620
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 621
    db->cursorposx = 0;
1275 mateusz.vi 622
    db->xoffset = db->cursor->len;
1327 mateusz.vi 623
    uidirty.from = 0;
624
    uidirty.to = 0xff;
1275 mateusz.vi 625
  } else {
1316 mateusz.vi 626
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 627
  }
628
}
629
 
630
 
1327 mateusz.vi 631
static void cursor_up(struct file *db) {
1422 mateusz.vi 632
  if (db->cursor->prev == NULL) return;
633
 
634
  db->curline -= 1;
635
  db->cursor = db->cursor->prev;
636
  if (db->cursorposy == 0) {
637
    uidirty.from = 0;
638
    uidirty.to = 0xff;
639
  } else {
640
    db->cursorposy -= 1;
1275 mateusz.vi 641
  }
642
}
643
 
644
 
1327 mateusz.vi 645
static void cursor_eol(struct file *db) {
1275 mateusz.vi 646
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 647
  if (db->xoffset > db->cursor->len) {
648
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 649
    uidirty.from = 0;
650
    uidirty.to = 0xff;
1282 mateusz.vi 651
  }
652
 
1427 mateusz.vi 653
  if (db->xoffset + screenlastcol <= db->cursor->len) {
1282 mateusz.vi 654
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 655
    uidirty.from = 0;
656
    uidirty.to = 0xff;
1282 mateusz.vi 657
  }
1316 mateusz.vi 658
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 659
}
660
 
661
 
1327 mateusz.vi 662
static void cursor_down(struct file *db) {
1422 mateusz.vi 663
  if (db->cursor->next == NULL) return;
664
 
665
  db->curline += 1;
666
  db->cursor = db->cursor->next;
667
  if (db->cursorposy < screenh - 2) {
668
    db->cursorposy += 1;
669
  } else {
670
    uidirty.from = 0;
671
    uidirty.to = 0xff;
1276 mateusz.vi 672
  }
673
}
674
 
675
 
1327 mateusz.vi 676
static void cursor_left(struct file *db) {
1316 mateusz.vi 677
  if (db->cursorposx > 0) {
678
    db->cursorposx -= 1;
1302 mateusz.vi 679
  } else if (db->xoffset > 0) {
680
    db->xoffset -= 1;
1327 mateusz.vi 681
    uidirty.from = 0;
682
    uidirty.to = 0xff;
1302 mateusz.vi 683
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 684
    cursor_up(db);
685
    cursor_eol(db);
1302 mateusz.vi 686
  }
687
}
688
 
689
 
1327 mateusz.vi 690
static void cursor_home(struct file *db) {
1316 mateusz.vi 691
  db->cursorposx = 0;
1282 mateusz.vi 692
  if (db->xoffset != 0) {
693
    db->xoffset = 0;
1327 mateusz.vi 694
    uidirty.from = 0;
695
    uidirty.to = 0xff;
1282 mateusz.vi 696
  }
1276 mateusz.vi 697
}
698
 
699
 
1327 mateusz.vi 700
static void cursor_right(struct file *db) {
1316 mateusz.vi 701
  if (db->cursor->len > db->xoffset + db->cursorposx) {
702
    if (db->cursorposx < screenw - 2) {
703
      db->cursorposx += 1;
1308 mateusz.vi 704
    } else {
705
      db->xoffset += 1;
1327 mateusz.vi 706
      uidirty.from = 0;
707
      uidirty.to = 0xff;
1308 mateusz.vi 708
    }
1357 mateusz.vi 709
  } else if (db->cursor->next != NULL) { /* jump to start of next line */
1327 mateusz.vi 710
    cursor_down(db);
711
    cursor_home(db);
1308 mateusz.vi 712
  }
713
}
714
 
715
 
1327 mateusz.vi 716
static void del(struct file *db) {
1316 mateusz.vi 717
  if (db->cursorposx + db->xoffset < db->cursor->len) {
1568 mateusz.vi 718
    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 719
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 720
    uidirty.from = db->cursorposy;
721
    uidirty.to = db->cursorposy;
1393 mateusz.vi 722
    db->modflag = 1;
1292 mateusz.vi 723
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
724
    struct line far *nextline = db->cursor->next;
725
    if (db->cursor->next->len > 0) {
1340 mateusz.vi 726
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
1568 mateusz.vi 727
        fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 728
        db->cursor->len += db->cursor->next->len;
729
      }
730
    }
1340 mateusz.vi 731
 
1292 mateusz.vi 732
    db->cursor->next = db->cursor->next->next;
733
    db->cursor->next->prev = db->cursor;
1340 mateusz.vi 734
 
1339 mateusz.vi 735
    line_free(nextline);
1327 mateusz.vi 736
    uidirty.from = db->cursorposy;
737
    uidirty.to = 0xff;
1328 mateusz.vi 738
    db->totlines -= 1;
1393 mateusz.vi 739
    db->modflag = 1;
1292 mateusz.vi 740
  }
741
}
742
 
743
 
1327 mateusz.vi 744
static void bkspc(struct file *db) {
1302 mateusz.vi 745
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1421 mateusz.vi 746
  if ((db->cursorposx + db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 747
 
1327 mateusz.vi 748
  cursor_left(db);
749
  del(db);
1302 mateusz.vi 750
}
751
 
752
 
1450 mateusz.vi 753
#define LOADFILE_FILENOTFOUND 2
754
 
1346 mateusz.vi 755
/* returns 0 on success, 1 on file not found, 2 on other error */
1449 mateusz.vi 756
static unsigned char loadfile(struct file *db, const char *fname) {
1324 mateusz.vi 757
  char *buffptr;
1556 mateusz.vi 758
  unsigned short len, llen;
759
  unsigned short fd;
1324 mateusz.vi 760
  unsigned char eolfound;
1449 mateusz.vi 761
  unsigned char err = 0;
1287 mateusz.vi 762
 
1355 mateusz.vi 763
  /* free the entire linked list of lines */
764
  db_rewind(db);
765
  while (db->cursor) {
766
    struct line far *victim;
767
    victim = db->cursor;
768
    db->cursor = db->cursor->next;
769
    line_free(victim);
770
  }
1321 mateusz.vi 771
 
1551 mateusz.vi 772
  /* zero out the struct (take care to preserve the id of the slot, though) */
773
  {
774
    unsigned char slotid = db->slotid;
775
    bzero(db, sizeof(struct file));
776
    db->slotid = slotid;
777
  }
1355 mateusz.vi 778
 
1448 mateusz.vi 779
  /* start by adding an empty line */
780
  if (line_add(db, NULL, 0) != 0) return(2);
781
 
1418 mateusz.vi 782
  if (fname == NULL) goto SKIPLOADING;
1321 mateusz.vi 783
 
1543 mateusz.vi 784
  /* make the filename canonical (DOS 3+ only, on earlier versions it just copies the filename) */
785
  mdr_dos_truename(db->fname, fname);
1355 mateusz.vi 786
 
1565 mateusz.vi 787
  /* fopen file */
788
  fd = 0;
789
  _asm {
790
    push cx
791
    push dx
792
 
793
    mov ax, 0x3d00
794
    mov dx, fname   // works only in SMALL memory model!
795
    xor cl, cl
796
    int 0x21
797
    mov fd, ax
798
    jnc done
799
    mov err, al
800
    done:
801
 
802
    pop dx
803
    pop cx
804
  }
805
 
1450 mateusz.vi 806
  if (err != 0) goto SKIPLOADING;
1287 mateusz.vi 807
 
1313 mateusz.vi 808
  db->lfonly = 1;
809
 
1324 mateusz.vi 810
  for (eolfound = 0;;) {
811
    unsigned short consumedbytes;
812
 
1574 mateusz.vi 813
    if ((dosfread(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
1324 mateusz.vi 814
    buffptr = buff;
815
 
816
    FINDLINE:
817
 
1361 mateusz.vi 818
    /* look for nearest \n (also expand tabs) */
1324 mateusz.vi 819
    for (consumedbytes = 0;; consumedbytes++) {
1361 mateusz.vi 820
 
821
      if (buffptr[consumedbytes] == '\t') {
822
        llen = consumedbytes;
823
        break;
824
      }
825
 
1324 mateusz.vi 826
      if (consumedbytes == len) {
827
        llen = consumedbytes;
828
        break;
1323 mateusz.vi 829
      }
1324 mateusz.vi 830
      if (buffptr[consumedbytes] == '\r') {
831
        llen = consumedbytes;
832
        consumedbytes++;
833
        db->lfonly = 0;
1320 mateusz.vi 834
        break;
835
      }
1324 mateusz.vi 836
      if (buffptr[consumedbytes] == '\n') {
837
        eolfound = 1;
838
        llen = consumedbytes;
839
        consumedbytes++;
840
        break;
841
      }
1287 mateusz.vi 842
    }
1324 mateusz.vi 843
 
844
    /* consumedbytes is the amount of bytes processed from buffptr,
845
     * llen is the length of line's payload (without its line terminator) */
846
 
847
    /* append content, if line is non-empty */
848
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1339 mateusz.vi 849
      goto IOERR;
1287 mateusz.vi 850
    }
851
 
1419 mateusz.vi 852
    /* allocate the next line if current line ended */
1324 mateusz.vi 853
    if (eolfound) {
1328 mateusz.vi 854
      if (line_add(db, NULL, 0) != 0) {
1339 mateusz.vi 855
        goto IOERR;
1324 mateusz.vi 856
      }
857
      eolfound = 0;
858
    }
1287 mateusz.vi 859
 
1361 mateusz.vi 860
    /* append 8 spaces if tab char found */
1412 mateusz.vi 861
    if ((consumedbytes < len) && (buffptr[consumedbytes] == '\t') && (glob_tablessmode == 0)) {
1361 mateusz.vi 862
      consumedbytes++;
863
      if (line_append(db, "        ", 8) != 0) {
864
        goto IOERR;
865
      }
866
    }
867
 
1324 mateusz.vi 868
    /* anything left? process the buffer leftover again */
869
    if (consumedbytes < len) {
870
      len -= consumedbytes;
871
      buffptr += consumedbytes;
872
      goto FINDLINE;
873
    }
874
 
875
  }
876
 
1573 mateusz.vi 877
  dosfclose(fd);
1287 mateusz.vi 878
 
1321 mateusz.vi 879
  SKIPLOADING:
880
 
1448 mateusz.vi 881
  /* rewind cursor to top of file because it has been used by line_add() */
1339 mateusz.vi 882
  db_rewind(db);
1320 mateusz.vi 883
 
1448 mateusz.vi 884
  return(err);
1339 mateusz.vi 885
 
886
  IOERR:
1573 mateusz.vi 887
  dosfclose(fd);
1450 mateusz.vi 888
  return(1);
1287 mateusz.vi 889
}
890
 
891
 
1356 mateusz.vi 892
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
893
 * of argc and argv, saves some 330 bytes of binary size
894
 * returns non-zero on error */
895
static int parseargv(struct file *dbarr) {
896
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
897
  unsigned short count = 0;
898
  char *arg;
899
  unsigned short lastarg = 0;
1449 mateusz.vi 900
  unsigned char err;
1356 mateusz.vi 901
 
902
  while (!lastarg) {
903
    /* jump to nearest arg */
904
    while (*tail == ' ') {
905
      *tail = 0;
906
      tail++;
907
    }
908
 
909
    if (*tail == '\r') {
910
      *tail = 0;
911
      break;
912
    }
913
 
914
    arg = tail;
915
 
916
    /* jump to next delimiter */
917
    while ((*tail != ' ') && (*tail != '\r')) tail++;
918
 
919
    /* if \r then remember this is the last arg */
920
    if (*tail == '\r') lastarg = 1;
921
 
922
    *tail = 0;
923
    tail++;
924
 
925
    /* look at the arg now */
926
    if (*arg == '/') {
1412 mateusz.vi 927
      if (arg[1] == 't') { /* /t = do not expand tabs */
928
        glob_tablessmode = 1;
929
 
930
      } else if (arg[1] == 'm') { /* /m = force mono mode */
931
        glob_monomode = 1;
932
 
933
      } else {  /* help screen */
1419 mateusz.vi 934
        mdr_coutraw_str(svarlang_str(1,3)); /* Sved, the SvarDOS editor */
1412 mateusz.vi 935
        mdr_coutraw_str(" [");
1419 mateusz.vi 936
        mdr_coutraw_str(svarlang_str(1,4)); /* ver */
1412 mateusz.vi 937
        mdr_coutraw_puts(" " PVER "]");
938
        mdr_coutraw_puts("Copyright (C) " PDATE " Mateusz Viste");
939
        mdr_coutraw_crlf();
1433 mateusz.vi 940
        mdr_coutraw_str("sved [/m] [/t] ");
1412 mateusz.vi 941
        mdr_coutraw_puts(svarlang_str(1,1)); /* args syntax */
942
        mdr_coutraw_crlf();
943
        mdr_coutraw_puts(svarlang_str(1,10)); /* /m */
944
        mdr_coutraw_puts(svarlang_str(1,11)); /* /t */
945
        return(-1);
1387 mateusz.vi 946
      }
1412 mateusz.vi 947
      continue;
1356 mateusz.vi 948
    }
949
 
950
    /* looks to be a filename */
951
    if (count == 10) {
1420 mateusz.vi 952
      mdr_coutraw_puts(svarlang_str(0,12)); /* too many files */
953
      return(-1);
1356 mateusz.vi 954
    }
955
 
956
    /* try loading it */
1387 mateusz.vi 957
    mdr_coutraw_str(svarlang_str(1,2));
958
    mdr_coutraw_char(' ');
1356 mateusz.vi 959
    mdr_coutraw_puts(arg);
960
    err = loadfile(&(dbarr[count]), arg);
961
    if (err) {
1450 mateusz.vi 962
      if (err == LOADFILE_FILENOTFOUND) { /* file not found */
1396 mateusz.vi 963
        if ((count == 0) && (lastarg != 0)) { /* a 'file not found' is fine if only one file was given */
964
          err = 0;
965
        } else {
966
          err = 11;
967
        }
1356 mateusz.vi 968
      } else { /* general error */
969
        err = 10;
970
      }
1396 mateusz.vi 971
      if (err) {
972
        mdr_coutraw_puts(svarlang_str(0,err));
973
        return(-1);
974
      }
1356 mateusz.vi 975
    }
976
    count++;
977
  }
978
 
979
  return(0);
980
}
981
 
982
 
1327 mateusz.vi 983
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1340 mateusz.vi 984
  if (curline_resize(db, db->cursor->len + len) == 0) {
1317 mateusz.vi 985
    unsigned short off = db->xoffset + db->cursorposx;
1393 mateusz.vi 986
    db->modflag = 1;
1568 mateusz.vi 987
    fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
1317 mateusz.vi 988
    db->cursor->len += len;
1327 mateusz.vi 989
    uidirty.from = db->cursorposy;
990
    uidirty.to = db->cursorposy;
1317 mateusz.vi 991
    while (len--) {
992
      db->cursor->payload[off++] = *databuf;
993
      databuf++;
1327 mateusz.vi 994
      cursor_right(db);
1317 mateusz.vi 995
    }
996
  }
997
}
998
 
999
 
1343 mateusz.vi 1000
/* recompute db->curline by counting nodes in linked list */
1001
static void recompute_curline(struct file *db) {
1002
  const struct line far *l = db->cursor;
1003
 
1004
  db->curline = 0;
1005
  while (l->prev != NULL) {
1006
    db->curline += 1;
1007
    l = l->prev;
1008
  }
1009
}
1010
 
1011
 
1354 mateusz.vi 1012
enum MENU_ACTION {
1393 mateusz.vi 1013
  MENU_NONE   = 0,
1014
  MENU_OPEN   = 1,
1015
  MENU_SAVE   = 2,
1016
  MENU_SAVEAS = 3,
1017
  MENU_CLOSE  = 4,
1018
  MENU_CHGEOL = 5,
1418 mateusz.vi 1019
  MENU_QUIT   = 6
1354 mateusz.vi 1020
};
1021
 
1022
static enum MENU_ACTION ui_menu(void) {
1023
  unsigned short i, curchoice, attr, x, slen;
1393 mateusz.vi 1024
  unsigned short xorigin, yorigin;
1354 mateusz.vi 1025
 
1026
  /* find out the longest string */
1027
  slen = 0;
1355 mateusz.vi 1028
  for (i = MENU_OPEN; i <= MENU_QUIT; i++) {
1354 mateusz.vi 1029
    x = strlen(svarlang_str(8, i));
1030
    if (x > slen) slen = x;
1031
  }
1032
 
1393 mateusz.vi 1033
  /* calculate where to draw the menu on screen */
1034
  xorigin = (screenw - (slen + 5)) / 2;
1395 mateusz.vi 1035
  yorigin = (screenh - (MENU_QUIT - MENU_OPEN + 6)) / 2;
1393 mateusz.vi 1036
 
1395 mateusz.vi 1037
  /* */
1038
  uidirty.from = yorigin;
1039
  uidirty.to = 0xff;
1040
  uidirty.statusbar = 1;
1041
 
1042
  /* hide the cursor */
1043
  mdr_cout_cursor_hide();
1044
 
1355 mateusz.vi 1045
  curchoice = MENU_OPEN;
1354 mateusz.vi 1046
  for (;;) {
1047
    /* render menu */
1393 mateusz.vi 1048
    for (i = MENU_NONE; i <= MENU_QUIT + 1; i++) {
1049
      mdr_cout_char_rep(yorigin + i, xorigin, ' ', SCHEME_MENU, slen+4);
1354 mateusz.vi 1050
      if (i == curchoice) {
1051
        attr = SCHEME_MENU_CUR;
1415 mateusz.vi 1052
        mdr_cout_char_rep(yorigin + i, xorigin + 1, ' ', SCHEME_MENU_SEL, slen + 2);
1354 mateusz.vi 1053
      } else {
1054
        attr = SCHEME_MENU;
1055
      }
1416 mateusz.vi 1056
      mdr_cout_str(yorigin + i, xorigin + 2, svarlang_str(8, i), attr, slen);
1354 mateusz.vi 1057
    }
1058
    /* wait for key */
1410 mateusz.vi 1059
    switch (mdr_dos_getkey2()) {
1354 mateusz.vi 1060
      case 0x150: /* down */
1061
        if (curchoice == MENU_QUIT) {
1355 mateusz.vi 1062
          curchoice = MENU_OPEN;
1354 mateusz.vi 1063
        } else {
1064
          curchoice++;
1065
        }
1066
        break;
1067
      case 0x148: /* up */
1355 mateusz.vi 1068
        if (curchoice == MENU_OPEN) {
1354 mateusz.vi 1069
          curchoice = MENU_QUIT;
1070
        } else {
1071
          curchoice--;
1072
        }
1073
        break;
1395 mateusz.vi 1074
      default:
1075
        curchoice = MENU_NONE;
1076
        /* FALLTHRU */
1077
      case '\r': /* ENTER */
1078
        mdr_cout_cursor_show();
1079
        return(curchoice);
1354 mateusz.vi 1080
    }
1081
  }
1082
}
1083
 
1084
 
1549 mateusz.vi 1085
static struct file *select_slot(struct file *dbarr, unsigned short curfile) {
1355 mateusz.vi 1086
  uidirty.from = 0;
1087
  uidirty.to = 0xff;
1088
  uidirty.statusbar = 1;
1089
 
1090
  dbarr = &(dbarr[curfile]);
1549 mateusz.vi 1091
 
1415 mateusz.vi 1092
  /* force redraw now, because the main() routine might not if this is exit
1093
   * time and we want to show the user which file has unsaved changes */
1549 mateusz.vi 1094
  ui_statusbar(dbarr);
1355 mateusz.vi 1095
  ui_refresh(dbarr);
1096
  return(dbarr);
1097
}
1098
 
1099
 
1347 mateusz.vi 1100
/* main returns nothing, ie. sved always exits with a zero exit code
1101
 * (this saves 20 bytes of executable footprint) */
1102
void main(void) {
1355 mateusz.vi 1103
  static struct file dbarr[10];
1104
  struct file *db = dbarr; /* visible file is the first slot by default */
1548 mateusz.vi 1105
  static struct line far *clipboard;
1538 mateusz.vi 1106
  static unsigned char original_breakflag;
1275 mateusz.vi 1107
 
1418 mateusz.vi 1108
  { /* load NLS resource */
1364 mateusz.vi 1109
    unsigned short i = 0;
1110
    const char far *selfptr;
1548 mateusz.vi 1111
    char lang[8];
1364 mateusz.vi 1112
    selfptr = mdr_dos_selfexe();
1113
    if (selfptr != NULL) {
1114
      do {
1548 mateusz.vi 1115
        buff[i] = selfptr[i];
1116
      } while (buff[i++] != 0);
1117
      svarlang_autoload_exepath(buff, mdr_dos_getenv(lang, "LANG", sizeof(lang)));
1364 mateusz.vi 1118
    }
1307 mateusz.vi 1119
  }
1282 mateusz.vi 1120
 
1355 mateusz.vi 1121
  /* preload all slots with empty files */
1549 mateusz.vi 1122
  {
1123
    unsigned short i;
1124
    for (i = 0; i < 10; i++) {
1125
      loadfile(&(dbarr[i]), NULL);
1126
      dbarr[i].slotid = i;
1127
    }
1355 mateusz.vi 1128
  }
1129
 
1356 mateusz.vi 1130
  /* parse argv (and load files, if any passed on) */
1131
  if (parseargv(dbarr) != 0) return;
1282 mateusz.vi 1132
 
1412 mateusz.vi 1133
  if ((mdr_cout_init(&screenw, &screenh) != 0) && (glob_monomode == 0)) {
1333 mateusz.vi 1134
    /* load color scheme if mdr_cout_init returns a color flag */
1135
    SCHEME_TEXT = 0x17;
1354 mateusz.vi 1136
    SCHEME_MENU = 0x70;
1388 mateusz.vi 1137
    SCHEME_MENU_CUR = 0x6f;
1138
    SCHEME_MENU_SEL = 0x66;
1333 mateusz.vi 1139
    SCHEME_STBAR1 = 0x70;
1140
    SCHEME_STBAR2 = 0x78;
1392 mateusz.vi 1141
    SCHEME_STBAR3 = 0x3f;
1333 mateusz.vi 1142
    SCHEME_SCROLL = 0x70;
1388 mateusz.vi 1143
    SCHEME_MSG = 0x6f;
1333 mateusz.vi 1144
    SCHEME_ERR = 0x4f;
1145
  }
1427 mateusz.vi 1146
  screenlastrow = screenh - 1;
1147
  screenlastcol = screenw - 1;
1275 mateusz.vi 1148
 
1414 mateusz.vi 1149
  /* instruct DOS to stop detecting CTRL+C because user needs it for
1150
   * copy/paste operations. also remember the original status of the BREAK
1151
   * flag so I can restore it as it was before quitting. */
1152
  original_breakflag = mdr_dos_ctrlc_disable();
1410 mateusz.vi 1153
 
1275 mateusz.vi 1154
  for (;;) {
1155
    int k;
1156
 
1362 mateusz.vi 1157
    /* add an extra empty line if cursor is on last line and this line is not empty */
1158
    if ((db->cursor->next == NULL) && (db->cursor->len != 0)) {
1159
      if (line_add(db, NULL, 0) == 0) {
1160
        db->cursor = db->cursor->prev; /* line_add() changes the cursor pointer */
1437 mateusz.vi 1161
        db->curline -= 1;
1362 mateusz.vi 1162
      }
1163
    }
1164
 
1327 mateusz.vi 1165
    check_cursor_not_after_eol(db);
1320 mateusz.vi 1166
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 1167
 
1392 mateusz.vi 1168
    ui_refresh(db);
1169
 
1436 mateusz.vi 1170
    if ((uidirty.statusbar != 0) || (db->modflagprev != db->modflag) || (db->curline_prev != db->curline)) {
1549 mateusz.vi 1171
      ui_statusbar(db);
1342 mateusz.vi 1172
      uidirty.statusbar = 0;
1355 mateusz.vi 1173
      db->modflagprev = db->modflag;
1436 mateusz.vi 1174
      db->curline_prev = db->curline;
1342 mateusz.vi 1175
    }
1328 mateusz.vi 1176
#ifdef DBG_LINENUM
1177
      {
1178
        char ddd[10];
1179
        db->curline += 1;
1180
        ddd[0] = '0' + db->curline / 100;
1181
        ddd[1] = '0' + (db->curline % 100) / 10;
1182
        ddd[2] = '0' + (db->curline % 10);
1183
        db->curline -= 1;
1184
        ddd[3] = '/';
1185
        ddd[4] = '0' + db->totlines / 100;
1186
        ddd[5] = '0' + (db->totlines % 100) / 10;
1187
        ddd[6] = '0' + (db->totlines % 10);
1188
        ddd[7] = 0;
1333 mateusz.vi 1189
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 1190
      }
1191
#endif
1275 mateusz.vi 1192
 
1410 mateusz.vi 1193
    k = mdr_dos_getkey2();
1282 mateusz.vi 1194
 
1275 mateusz.vi 1195
    if (k == 0x150) { /* down */
1327 mateusz.vi 1196
      cursor_down(db);
1275 mateusz.vi 1197
 
1198
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 1199
      cursor_up(db);
1275 mateusz.vi 1200
 
1201
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 1202
      cursor_right(db);
1275 mateusz.vi 1203
 
1204
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 1205
      cursor_left(db);
1275 mateusz.vi 1206
 
1282 mateusz.vi 1207
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 1208
      unsigned char dist = db->cursorposy + screenh - 1;
1209
      while ((dist != 0) && (db->cursor->prev != NULL)) {
1210
        db->cursor = db->cursor->prev;
1211
        dist--;
1212
      }
1213
      if (dist != 0) {
1214
        db->cursorposy = 0;
1215
        db->cursorposx = 0;
1216
      } else {
1217
        dist = db->cursorposy;
1218
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
1219
      }
1220
      uidirty.from = 0;
1221
      uidirty.to = 0xff;
1343 mateusz.vi 1222
      recompute_curline(db);
1282 mateusz.vi 1223
 
1224
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 1225
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
1226
      while ((dist != 0) && (db->cursor->next != NULL)) {
1227
        db->cursor = db->cursor->next;
1228
        dist--;
1229
      }
1230
      if (dist != 0) {
1231
        db->cursorposy = screenh - 2;
1232
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
1233
        db->cursorposx = 0;
1234
      } else {
1235
        dist = screenh - 2 - db->cursorposy;
1236
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
1237
      }
1238
      uidirty.from = 0;
1239
      uidirty.to = 0xff;
1343 mateusz.vi 1240
      recompute_curline(db);
1282 mateusz.vi 1241
 
1242
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 1243
       cursor_home(db);
1282 mateusz.vi 1244
 
1245
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 1246
       cursor_eol(db);
1282 mateusz.vi 1247
 
1275 mateusz.vi 1248
    } else if (k == 0x1B) { /* ESC */
1354 mateusz.vi 1249
      int quitnow = 0;
1394 mateusz.vi 1250
      char fname[64];
1354 mateusz.vi 1251
      int saveflag = 0;
1393 mateusz.vi 1252
      enum MENU_ACTION ui_action;
1275 mateusz.vi 1253
 
1392 mateusz.vi 1254
      /* collect the exact menu action and clear the screen */
1255
      ui_action = ui_menu();
1256
      ui_refresh(db);
1354 mateusz.vi 1257
 
1392 mateusz.vi 1258
      switch (ui_action) {
1259
 
1354 mateusz.vi 1260
        case MENU_NONE:
1261
          break;
1262
 
1263
        case MENU_OPEN:
1264
          /* display a warning if unsaved changes are pending */
1547 mateusz.vi 1265
          if (db->modflag != 0) ui_msg(4, 8, 0, SCHEME_MSG);
1354 mateusz.vi 1266
 
1267
          /* ask for filename */
1268
          ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
1269
          if (fname[0] != 0) {
1449 mateusz.vi 1270
            unsigned char err;
1354 mateusz.vi 1271
            err = loadfile(db, fname);
1272
            if (err != 0) {
1450 mateusz.vi 1273
              if (err == LOADFILE_FILENOTFOUND) {
1547 mateusz.vi 1274
                ui_msg(11, 0, 0, SCHEME_ERR); /* file not found */
1354 mateusz.vi 1275
              } else {
1547 mateusz.vi 1276
                ui_msg(10, 0, 0, SCHEME_ERR);  /* ERROR */
1354 mateusz.vi 1277
              }
1278
              mdr_bios_tickswait(44); /* 3s */
1418 mateusz.vi 1279
              loadfile(db, NULL);
1354 mateusz.vi 1280
            }
1281
          }
1393 mateusz.vi 1282
          uidirty.from = 0;
1283
          uidirty.to = 0xff;
1284
          uidirty.statusbar = 1;
1354 mateusz.vi 1285
          break;
1286
 
1287
        case MENU_SAVEAS:
1288
          saveflag = 1;
1289
          /* FALLTHRU */
1290
        case MENU_SAVE:
1291
          if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
1292
            ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
1293
            if (*fname == 0) break;
1294
            saveflag = savefile(db, fname);
1295
          } else {
1296
            saveflag = savefile(db, NULL);
1297
          }
1298
 
1395 mateusz.vi 1299
          mdr_cout_cursor_hide();
1300
 
1354 mateusz.vi 1301
          if (saveflag == 0) {
1547 mateusz.vi 1302
            ui_msg(2, 0, 0, SCHEME_MSG);
1354 mateusz.vi 1303
            mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
1304
          } else {
1547 mateusz.vi 1305
            ui_msg(10, 0, 0, SCHEME_ERR);
1354 mateusz.vi 1306
            mdr_bios_tickswait(36); /* 2s */
1307
          }
1395 mateusz.vi 1308
          mdr_cout_cursor_show();
1354 mateusz.vi 1309
          break;
1310
 
1355 mateusz.vi 1311
        case MENU_CLOSE:
1312
          if (ui_confirm_if_unsaved(db) == 0) {
1418 mateusz.vi 1313
            loadfile(db, NULL);
1355 mateusz.vi 1314
          }
1315
          uidirty.from = 0;
1316
          uidirty.to = 0xff;
1317
          uidirty.statusbar = 1;
1318
          break;
1319
 
1354 mateusz.vi 1320
        case MENU_CHGEOL:
1393 mateusz.vi 1321
          db->modflag = 1;
1354 mateusz.vi 1322
          db->lfonly ^= 1;
1323
          break;
1324
 
1325
        case MENU_QUIT:
1355 mateusz.vi 1326
          quitnow = 1;
1549 mateusz.vi 1327
          {
1328
            unsigned short curfile;
1329
            for (curfile = 0; curfile < 10; curfile++) {
1330
              if (dbarr[curfile].modflag == 0) continue; /* skip unmodified slots */
1355 mateusz.vi 1331
              db = select_slot(dbarr, curfile);
1441 mateusz.vi 1332
              if (ui_confirm_if_unsaved(db) != 0) {
1333
                quitnow = 0;
1334
                break;
1335
              }
1355 mateusz.vi 1336
            }
1337
          }
1354 mateusz.vi 1338
          break;
1339
      }
1340
 
1341
      if (quitnow) break;
1342
 
1289 mateusz.vi 1343
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 1344
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 1345
      /* add a new line */
1328 mateusz.vi 1346
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1393 mateusz.vi 1347
        db->modflag = 1;
1328 mateusz.vi 1348
        db->cursor = db->cursor->prev; /* back to original line */
1427 mateusz.vi 1349
        db->curline -= 1;
1289 mateusz.vi 1350
        /* trim the line above */
1328 mateusz.vi 1351
        db->cursor->len = off;
1289 mateusz.vi 1352
        /* move cursor to the (new) line below */
1328 mateusz.vi 1353
        uidirty.from = db->cursorposy;
1327 mateusz.vi 1354
        uidirty.to = 0xff;
1328 mateusz.vi 1355
        cursor_down(db);
1356
        cursor_home(db);
1289 mateusz.vi 1357
      } else {
1358
        /* ERROR: OUT OF MEMORY */
1359
      }
1360
 
1292 mateusz.vi 1361
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 1362
      del(db);
1292 mateusz.vi 1363
 
1302 mateusz.vi 1364
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 1365
      bkspc(db);
1302 mateusz.vi 1366
 
1308 mateusz.vi 1367
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 1368
      char c = k;
1327 mateusz.vi 1369
      insert_in_line(db, &c, 1);
1308 mateusz.vi 1370
 
1317 mateusz.vi 1371
    } else if (k == 0x009) { /* TAB */
1412 mateusz.vi 1372
      if (glob_tablessmode == 0) {
1373
        insert_in_line(db, "        ", 8);
1374
      } else {
1375
        insert_in_line(db, "\t", 1);
1376
      }
1317 mateusz.vi 1377
 
1355 mateusz.vi 1378
    } else if ((k >= 0x13b) && (k <= 0x144)) { /* F1..F10 */
1549 mateusz.vi 1379
      db = select_slot(dbarr, k - 0x13b);
1309 mateusz.vi 1380
 
1325 mateusz.vi 1381
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
1382
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
1383
      for (;;) {
1384
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
1385
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 1386
        cursor_right(db);
1325 mateusz.vi 1387
      }
1388
      /* now skip to next non-space or end of file */
1389
      for (;;) {
1327 mateusz.vi 1390
        cursor_right(db);
1325 mateusz.vi 1391
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1392
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
1393
      }
1394
 
1395
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 1396
      cursor_left(db);
1325 mateusz.vi 1397
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
1398
      for (;;) {
1399
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
1400
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 1401
        cursor_left(db);
1325 mateusz.vi 1402
      }
1403
      /* now skip to next space or start of file */
1404
      for (;;) {
1327 mateusz.vi 1405
        cursor_left(db);
1325 mateusz.vi 1406
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 1407
          cursor_right(db);
1325 mateusz.vi 1408
          break;
1409
        }
1410
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
1411
      }
1412
 
1410 mateusz.vi 1413
    } else if ((k == 0x003) || (k == 0x018)) { /* CTRL+C or CTRL+X */
1414
      /* free clipboard if anything in it */
1415
      if (clipboard != NULL) line_free(clipboard);
1416
 
1417
      /* copy cursor line to clipboard */
1418
      clipboard = line_calloc(db->cursor->len);
1419
      if (clipboard == NULL) {
1547 mateusz.vi 1420
        ui_msg(10, 0, 0, SCHEME_ERR); /* ERROR */
1410 mateusz.vi 1421
        mdr_bios_tickswait(18); /* 1s */
1422
      } else {
1427 mateusz.vi 1423
        mdr_cout_char_rep(db->cursorposy, 0, ' ', ((SCHEME_TEXT >> 4) | (SCHEME_TEXT << 4)) & 0xff, screenlastcol);
1410 mateusz.vi 1424
        uidirty.from = db->cursorposy;
1425
        uidirty.to = db->cursorposy;
1426
        if (db->cursor->len != 0) {
1568 mateusz.vi 1427
          fmemmove(clipboard->payload, db->cursor->payload, db->cursor->len);
1410 mateusz.vi 1428
          clipboard->len = db->cursor->len;
1429
        }
1430
        mdr_bios_tickswait(2); /* ca 100ms */
1431
 
1432
        /* if this is about cutting the line (CTRL+X) then delete cur line */
1433
        if ((k == 0x018) && ((db->cursor->next != NULL) || (db->cursor->prev != NULL))) {
1434
          if (db->cursor->next) db->cursor->next->prev = db->cursor->prev;
1435
          if (db->cursor->prev) db->cursor->prev->next = db->cursor->next;
1436
          clipboard->prev = db->cursor;
1437
          if (db->cursor->next) {
1438
            db->cursor = db->cursor->next;
1439
          } else {
1440
            cursor_up(db);
1441
          }
1442
          line_free(clipboard->prev);
1423 mateusz.vi 1443
          db->totlines -= 1;
1552 mateusz.vi 1444
          db->modflag = 1;
1410 mateusz.vi 1445
          uidirty.from = 0;
1446
          uidirty.to = 0xff;
1412 mateusz.vi 1447
          recompute_curline(db);
1410 mateusz.vi 1448
        }
1449
      }
1450
 
1420 mateusz.vi 1451
    } else if ((k == 0x016) && (clipboard != NULL)) { /* CTRL+V */
1452
      if (line_add(db, clipboard->payload, clipboard->len) != 0) {
1547 mateusz.vi 1453
        ui_msg(10, 0, 0, SCHEME_ERR); /* ERROR */
1420 mateusz.vi 1454
        mdr_bios_tickswait(18); /* 1s */
1455
      } else {
1456
        /* rewire the linked list so the new line is on top of the previous one */
1457
        clipboard->prev = db->cursor->prev;
1458
        /* remove prev node from list */
1459
        db->cursor->prev = db->cursor->prev->prev;
1460
        if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor;
1461
        /* insert the node after cursor now */
1462
        clipboard->prev->next = db->cursor->next;
1463
        if (db->cursor->next != NULL) db->cursor->next->prev = clipboard->prev;
1464
        clipboard->prev->prev = db->cursor;
1465
        db->cursor->next = clipboard->prev;
1466
        cursor_down(db);
1552 mateusz.vi 1467
        db->modflag = 1;
1410 mateusz.vi 1468
      }
1469
      uidirty.from = 0;
1470
      uidirty.to = 0xff;
1412 mateusz.vi 1471
      recompute_curline(db);
1410 mateusz.vi 1472
 
1333 mateusz.vi 1473
#ifdef DBG_UNHKEYS
1282 mateusz.vi 1474
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
1475
      char buff[4];
1476
      const char *HEX = "0123456789ABCDEF";
1477
      buff[0] = HEX[(k >> 8) & 15];
1478
      buff[1] = HEX[(k >> 4) & 15];
1479
      buff[2] = HEX[k & 15];
1333 mateusz.vi 1480
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
1481
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1410 mateusz.vi 1482
      mdr_dos_getkey2();
1275 mateusz.vi 1483
      break;
1333 mateusz.vi 1484
#endif
1275 mateusz.vi 1485
    }
1486
  }
1487
 
1488
  mdr_cout_close();
1489
 
1414 mateusz.vi 1490
  /* restore the DOS BREAK flag if it was originally set */
1491
  if (original_breakflag != 0) mdr_dos_ctrlc_enable();
1492
 
1320 mateusz.vi 1493
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 1494
 
1347 mateusz.vi 1495
  return;
1275 mateusz.vi 1496
}