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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 
 
1556 mateusz.vi 28 
#include "libc.h"
29 
 
1312 mateusz.vi 30 
#include "mdr\bios.h"
1275 mateusz.vi 31 
#include "mdr\cout.h"
1307 mateusz.vi 32 
#include "mdr\dos.h"
1275 mateusz.vi 33 
 
1282 mateusz.vi 34 
#include "svarlang\svarlang.h"
35 
 
1326 mateusz.vi 36 
 
1537 mateusz.vi 37 
#define PVER "2023.5"
1356 mateusz.vi 38 
#define PDATE "2023"
39 
 
1326 mateusz.vi 40 
/*****************************************************************************
41 
 * global variables and definitions                                          *
42 
 *****************************************************************************/
43 
 
1275 mateusz.vi 44 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
1333 mateusz.vi 45 
static unsigned char SCHEME_TEXT   = 0x07,
1354 mateusz.vi 46 
                     SCHEME_MENU   = 0x70,
47 
                     SCHEME_MENU_CUR= 0x0f,
48 
                     SCHEME_MENU_SEL= 0x00,
1333 mateusz.vi 49 
                     SCHEME_STBAR1 = 0x70,
1358 mateusz.vi 50 
                     SCHEME_STBAR2 = 0x70, /* greyed out information */
51 
                     SCHEME_STBAR3 = 0x70, /* query */
1333 mateusz.vi 52 
                     SCHEME_SCROLL = 0x70,
53 
                     SCHEME_MSG    = 0x70,
1358 mateusz.vi 54 
                     SCHEME_ERR    = 0x70;
1327 mateusz.vi 55 
 
1427 mateusz.vi 56 
static unsigned char screenw, screenh, screenlastrow, screenlastcol;
1412 mateusz.vi 57 
static unsigned char glob_monomode, glob_tablessmode;
1275 mateusz.vi 58 
 
1548 mateusz.vi 59 
static char buff[512]; /* short lived buffer for whatever needed */
60 
 
1327 mateusz.vi 61 
static struct {
62 
    unsigned char from;
63 
    unsigned char to;
1342 mateusz.vi 64 
    unsigned char statusbar;
65 
} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */
1327 mateusz.vi 66 
 
1275 mateusz.vi 67 
#define SCROLL_CURSOR 0xB1
68 
 
69 
struct line {
1430 mateusz.vi 70 
  unsigned short len;
71 
  struct line far *next;
1288 mateusz.vi 72 
  struct line far *prev;
1275 mateusz.vi 73 
  char payload[1];
74 
};
75 
 
1315 mateusz.vi 76 
struct file {
1288 mateusz.vi 77 
  struct line far *cursor;
1275 mateusz.vi 78 
  unsigned short xoffset;
1348 mateusz.vi 79 
  unsigned short cursorposx;
80 
  unsigned short cursorposy;
1328 mateusz.vi 81 
  unsigned short totlines;
82 
  unsigned short curline;
1436 mateusz.vi 83 
  unsigned short curline_prev;
1330 mateusz.vi 84 
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
85 
  char modflag;  /* non-zero if file has been modified since last save */
1355 mateusz.vi 86 
  char modflagprev;
1549 mateusz.vi 87 
  char slotid; /* 0..9 */
1332 mateusz.vi 88 
  char fname[128];
1275 mateusz.vi 89 
};
90 
 
91 
 
1572 mateusz.vi 92 
 
1326 mateusz.vi 93 
/*****************************************************************************
1572 mateusz.vi 94 
 * assembly "functions"                                                      *
95 
 *****************************************************************************/
96 
 
97 
unsigned short dosalloc(unsigned short siz);
98 
 
99 
#pragma aux dosalloc = \
100 
"mov ah, 0x48" \
101 
"int 0x21" \
102 
"jnc done" \
103 
"xor ax, ax" \
104 
"done:" \
105 
parm [bx] \
106 
value [ax];
107 
 
108 
 
109 
unsigned short dosfree(unsigned short segn);
110 
 
111 
#pragma aux dosfree = \
112 
"mov ah, 0x49" \
113 
"int 0x21" \
114 
"jc done" \
115 
"xor ax, ax" \
116 
"done:" \
117 
parm [es] \
118 
value [ax];
119 
 
120 
 
121 
/*****************************************************************************
1326 mateusz.vi 122 
 * functions                                                                 *
123 
 *****************************************************************************/
124 
 
1339 mateusz.vi 125 
static struct line far *line_calloc(unsigned short siz) {
1342 mateusz.vi 126 
  struct line far *res;
1556 mateusz.vi 127 
  unsigned short seg;
1461 mateusz.vi 128 
 
1572 mateusz.vi 129 
  seg = dosalloc((sizeof(struct line) + siz + 15) / 16);
1556 mateusz.vi 130 
  if (seg == 0) return(NULL);
1342 mateusz.vi 131 
  res = MK_FP(seg, 0);
1461 mateusz.vi 132 
  res->len = 0;
133 
  res->next = NULL;
134 
  res->prev = NULL;
135 
 
136 
  return(res);
1339 mateusz.vi 137 
}
138 
 
139 
 
140 
static void line_free(struct line far *ptr) {
1572 mateusz.vi 141 
  dosfree(FP_SEG(ptr));
1339 mateusz.vi 142 
}
143 
 
144 
 
1550 mateusz.vi 145 
static int curline_resize(struct file *db, unsigned short newsiz) {
1339 mateusz.vi 146 
  struct line far *newptr;
147 
 
1341 mateusz.vi 148 
  /* try resizing the block (much faster) */
1557 mateusz.vi 149 
  if (mdr_dos_resizeblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor)) == 0) return(0);
1339 mateusz.vi 150 
 
151 
  /* create a new block and copy data over */
152 
  newptr = line_calloc(newsiz);
1340 mateusz.vi 153 
  if (newptr == NULL) return(-1);
1568 mateusz.vi 154 
  fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
1340 mateusz.vi 155 
 
156 
  /* rewire the linked list */
157 
  db->cursor = newptr;
158 
  if (newptr->next) newptr->next->prev = newptr;
159 
  if (newptr->prev) newptr->prev->next = newptr;
160 
 
161 
  return(0);
1339 mateusz.vi 162 
}
163 
 
164 
 
1328 mateusz.vi 165 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 166 
 * returns non-zero on error */
1328 mateusz.vi 167 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 168 
  struct line far *l;
1275 mateusz.vi 169 
 
1339 mateusz.vi 170 
  l = line_calloc(slen);
1287 mateusz.vi 171 
  if (l == NULL) return(-1);
172 
 
1275 mateusz.vi 173 
  l->prev = db->cursor;
174 
  if (db->cursor) {
175 
    l->next = db->cursor->next;
176 
    db->cursor->next = l;
177 
    l->next->prev = l;
178 
  }
179 
  db->cursor = l;
1342 mateusz.vi 180 
  if (slen > 0) {
1568 mateusz.vi 181 
    fmemmove(l->payload, line, slen);
1342 mateusz.vi 182 
    l->len = slen;
183 
  }
1287 mateusz.vi 184 
 
1328 mateusz.vi 185 
  db->totlines += 1;
186 
  db->curline += 1;
187 
 
1287 mateusz.vi 188 
  return(0);
1275 mateusz.vi 189 
}
190 
 
191 
 
1348 mateusz.vi 192 
static void ui_getstring(const char *query, char *s, unsigned short maxlen) {
193 
  unsigned short len = 0;
1544 mateusz.vi 194 
  unsigned char x;
1332 mateusz.vi 195 
  int k;
196 
 
197 
  if (maxlen == 0) return;
198 
  maxlen--; /* make room for the nul terminator */
199 
 
200 
  /* print query string */
1544 mateusz.vi 201 
  x = mdr_cout_str(screenlastrow, 0, query, SCHEME_STBAR3, 40);
202 
  mdr_cout_char_rep(screenlastrow, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 203 
 
204 
  for (;;) {
1544 mateusz.vi 205 
    mdr_cout_locate(screenlastrow, x + len);
1410 mateusz.vi 206 
    k = mdr_dos_getkey2();
1332 mateusz.vi 207 
 
1345 mateusz.vi 208 
    switch (k) {
209 
      case 0x1b: /* ESC */
210 
        s[0] = 0;
211 
        return;
212 
      case '\r':
213 
        s[len] = 0;
214 
        return;
215 
      case 0x08: /* BKSPC */
216 
        if (len > 0) {
217 
          len--;
1544 mateusz.vi 218 
          mdr_cout_char(screenlastrow, x + len, ' ', SCHEME_STBAR3);
1345 mateusz.vi 219 
        }
220 
        break;
221 
      default:
222 
        if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
1544 mateusz.vi 223 
          mdr_cout_char(screenlastrow, x + len, k, SCHEME_STBAR3);
1345 mateusz.vi 224 
          s[len++] = k;
225 
        }
1332 mateusz.vi 226 
    }
1345 mateusz.vi 227 
  }
1332 mateusz.vi 228 
 
229 
}
230 
 
231 
 
1324 mateusz.vi 232 
/* append a nul-terminated string to line at cursor position */
1550 mateusz.vi 233 
static int line_append(struct file *f, const char *buf, unsigned short len) {
1427 mateusz.vi 234 
  if (sizeof(struct line) + f->cursor->len + len < len) goto ERR; /* overflow check */
235 
  if (curline_resize(f, f->cursor->len + len) != 0) goto ERR;
236 
 
1568 mateusz.vi 237 
  fmemmove(f->cursor->payload + f->cursor->len, buf, len);
1324 mateusz.vi 238 
  f->cursor->len += len;
239 
 
240 
  return(0);
1427 mateusz.vi 241 
  ERR:
242 
  return(-1);
1324 mateusz.vi 243 
}
244 
 
245 
 
1315 mateusz.vi 246 
static void db_rewind(struct file *db) {
1275 mateusz.vi 247 
  if (db->cursor == NULL) return;
248 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 249 
  db->curline = 0;
1275 mateusz.vi 250 
}
251 
 
252 
 
1541 mateusz.vi 253 
/* saves db file, resets db->modflag on success and overwrites the filename
254 
 * field if saveas is not NULL */
255 
static int savefile(struct file *db, const char *saveas) {
1539 mateusz.vi 256 
  int fd = 0;
257 
  const struct line far *l;
1556 mateusz.vi 258 
  unsigned short bytes;
1539 mateusz.vi 259 
  unsigned char eollen = 2;
260 
  const unsigned char *eolbuf = "\r\n";
261 
  int errflag = 0;
262 
 
263 
  /* if filename not overloaded then use the fname in db */
264 
  if (saveas == NULL) saveas = db->fname;
265 
 
266 
  _asm {
267 
    push ax
268 
    push cx
269 
    push dx
270 
 
271 
    mov ah, 0x3C    /* create or truncate file */
272 
    xor cx, cx      /* file attributes */
273 
    mov dx, saveas  /* works only in SMALL/TINY mode */
274 
    int 0x21
275 
    jnc DONE
276 
    mov errflag, ax
277 
    DONE:
278 
    mov fd, ax
279 
 
280 
    pop dx
281 
    pop cx
282 
    pop ax
283 
  }
284 
 
285 
  if (errflag != 0) return(-1);
286 
 
287 
  l = db->cursor;
288 
  while (l->prev) l = l->prev;
289 
 
290 
  /* preset line terminators */
291 
  if (db->lfonly) {
292 
    eolbuf++;
293 
    eollen--;
294 
  }
295 
 
296 
  while (l) {
297 
    /* do not write the last empty line, it is only useful for edition */
298 
    if (l->len != 0) {
1556 mateusz.vi 299 
      errflag |= mdr_dos_write(fd, l->payload, l->len, &bytes);
1539 mateusz.vi 300 
    } else if (l->next == NULL) {
301 
      break;
302 
    }
1556 mateusz.vi 303 
    errflag |= mdr_dos_write(fd, eolbuf, eollen, &bytes);
1539 mateusz.vi 304 
    l = l->next;
305 
  }
306 
 
1556 mateusz.vi 307 
  errflag |= mdr_dos_fclose(fd);
1539 mateusz.vi 308 
 
1541 mateusz.vi 309 
  /* did it all work? */
310 
  if (errflag == 0) {
311 
    db->modflag = 0;
312 
    if (saveas != db->fname) mdr_dos_truename(db->fname, saveas);
313 
  }
314 
 
1539 mateusz.vi 315 
  return(errflag);
316 
}
317 
 
318 
 
1549 mateusz.vi 319 
static void ui_statusbar(const struct file *db) {
1356 mateusz.vi 320 
  const char *s = svarlang_strid(0); /* ESC=MENU */
1348 mateusz.vi 321 
  unsigned short helpcol = screenw - strlen(s);
1440 mateusz.vi 322 
  unsigned short col;
1275 mateusz.vi 323 
 
1425 mateusz.vi 324 
  /* slot number (guaranteed to be 0-9) */
1355 mateusz.vi 325 
  {
326 
    char slot[4] = "#00";
1549 mateusz.vi 327 
    if (db->slotid == 9) {
1425 mateusz.vi 328 
      slot[1] = '1';
329 
    } else {
1549 mateusz.vi 330 
      slot[2] += db->slotid + 1;
1425 mateusz.vi 331 
    }
1427 mateusz.vi 332 
    mdr_cout_str(screenlastrow, 0, slot, SCHEME_STBAR2, 3);
1355 mateusz.vi 333 
  }
1313 mateusz.vi 334 
 
1355 mateusz.vi 335 
  /* fill rest of status bar with background */
1427 mateusz.vi 336 
  mdr_cout_char_rep(screenlastrow, 3, ' ', SCHEME_STBAR1, helpcol - 3);
1355 mateusz.vi 337 
 
1313 mateusz.vi 338 
  /* eol type */
1330 mateusz.vi 339 
  {
340 
    const char *eoltype = "CRLF";
1353 mateusz.vi 341 
    if (db->lfonly) eoltype += 2;
1440 mateusz.vi 342 
    mdr_cout_str(screenlastrow, helpcol - 5, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 343 
  }
1313 mateusz.vi 344 
 
1438 mateusz.vi 345 
  /* line numbers */
1436 mateusz.vi 346 
  {
1438 mateusz.vi 347 
    unsigned short x;
348 
    unsigned char count = 0;
1440 mateusz.vi 349 
    col = helpcol - 7;
1438 mateusz.vi 350 
 
1439 mateusz.vi 351 
    x = db->totlines;
1438 mateusz.vi 352 
    AGAIN:
1436 mateusz.vi 353 
    do {
1439 mateusz.vi 354 
      mdr_cout_char(screenlastrow, col--, '0' + (x % 10), SCHEME_STBAR1);
1436 mateusz.vi 355 
      x /= 10;
356 
    } while (x);
1438 mateusz.vi 357 
    /* redo same exercise, but printing the current line now */
358 
    if (count == 0) {
359 
      count = 1;
1439 mateusz.vi 360 
      mdr_cout_char(screenlastrow, col--, '/', SCHEME_STBAR1);
1438 mateusz.vi 361 
      x = 1 + db->curline;
362 
      goto AGAIN;
363 
    }
1440 mateusz.vi 364 
  }
1438 mateusz.vi 365 
 
1440 mateusz.vi 366 
  /* filename and modflag */
367 
  {
368 
    const char *fn;
369 
    unsigned short x;
370 
    unsigned short maxfnlen = col - 6;
371 
    if (db->fname[0] == 0) {
372 
      fn = svarlang_str(0, 1); /* "UNTITLED" */
373 
    } else {
374 
      /* display filename up to maxfnlen chars */
375 
      fn = db->fname;
376 
      x = strlen(fn);
377 
      if (x > maxfnlen) fn += x - maxfnlen;
378 
    }
379 
    x = mdr_cout_str(screenlastrow, 4, fn, SCHEME_STBAR1, maxfnlen);
380 
    if (db->modflag) mdr_cout_char(screenlastrow, 5 + x, '!', SCHEME_STBAR2);
1436 mateusz.vi 381 
  }
382 
 
1427 mateusz.vi 383 
  mdr_cout_str(screenlastrow, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 384 
}
385 
 
386 
 
1547 mateusz.vi 387 
static void ui_msg(unsigned short msgid1, unsigned short msgid2, unsigned short msgid3, unsigned char attr) {
388 
  unsigned short x, y, maxmsglen, i;
389 
  unsigned short msgcount = 1;
390 
  const char *msg[3];
1331 mateusz.vi 391 
 
1547 mateusz.vi 392 
  msg[0] = svarlang_strid(msgid1);
393 
 
394 
  if (msgid2 != 0) {
395 
    msgcount = 2;
396 
    msg[1] = svarlang_strid(msgid2);
1331 mateusz.vi 397 
  }
1547 mateusz.vi 398 
  if (msgid3 != 0) {
399 
    msgcount = 3;
400 
    msg[2] = svarlang_strid(msgid3);
401 
  }
1331 mateusz.vi 402 
 
1547 mateusz.vi 403 
  /* find longest msg */
404 
  maxmsglen = 0;
405 
  for (i = 0; i < msgcount; i++) {
406 
    y = strlen(msg[i]);
407 
    if (y > maxmsglen) maxmsglen = y;
408 
  }
409 
 
1331 mateusz.vi 410 
  y = (screenh - 6) >> 1;
1547 mateusz.vi 411 
  x = (screenw - maxmsglen - 3) >> 1;
412 
  for (i = y+1+msgcount; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, maxmsglen + 2);
1331 mateusz.vi 413 
  x++;
1345 mateusz.vi 414 
 
1547 mateusz.vi 415 
  for (i = 0; i < msgcount; i++) {
416 
    mdr_cout_str(y+1+i, x, msg[i], attr, maxmsglen);
417 
  }
1312 mateusz.vi 418 
 
1327 mateusz.vi 419 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 420 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 421 
}
422 
 
423 
 
1539 mateusz.vi 424 
/* returns 0 if operation may proceed, non-zero to cancel */
1541 mateusz.vi 425 
static unsigned char ui_confirm_if_unsaved(struct file *db) {
1539 mateusz.vi 426 
  int k;
427 
 
1342 mateusz.vi 428 
  if (db->modflag == 0) return(0);
429 
 
1355 mateusz.vi 430 
  mdr_cout_cursor_hide();
431 
 
1539 mateusz.vi 432 
  /* if file has been modified then ask for confirmation:
433 
   * ENTER        : agree to data loss
434 
   * SPACE        : SAVE file before quit (only if valid filename present)
435 
   * anything else: ABORT */
1547 mateusz.vi 436 
  ui_msg(4, 5, (db->fname[0])?9:8, SCHEME_MSG);
1342 mateusz.vi 437 
 
1539 mateusz.vi 438 
  k = mdr_dos_getkey2();
1355 mateusz.vi 439 
  mdr_cout_cursor_show();
440 
 
1539 mateusz.vi 441 
  /* ENTER = agree to loose unsaved data */
442 
  if (k == '\r') return(0);
443 
 
444 
  /* SPACE = save file and continue */
445 
  if ((k == ' ') && (db->fname[0] != 0) && (savefile(db, NULL) == 0)) return(0);
446 
 
447 
  /* any other key = cancel operation */
448 
  return(1);
1342 mateusz.vi 449 
}
450 
 
451 
 
1327 mateusz.vi 452 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 453 
  unsigned char x;
1310 mateusz.vi 454 
  const struct line far *l;
1316 mateusz.vi 455 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 456 
 
1392 mateusz.vi 457 
  /* quit early if nothing to refresh */
458 
  if (uidirty.from == 0xff) return;
459 
 
1288 mateusz.vi 460 
#ifdef DBG_REFRESH
1282 mateusz.vi 461 
  static char m = 'a';
462 
  m++;
463 
  if (m > 'z') m = 'a';
1288 mateusz.vi 464 
#endif
1282 mateusz.vi 465 
 
1310 mateusz.vi 466 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 467 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 468 
 
1310 mateusz.vi 469 
  /* iterate over lines and redraw whatever needs to be redrawn */
470 
  for (; l != NULL; l = l->next, y++) {
471 
 
472 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 473 
    if (y < uidirty.from) continue;
474 
    if (y > uidirty.to) break;
1282 mateusz.vi 475 
 
1318 mateusz.vi 476 
    x = 0;
1275 mateusz.vi 477 
    if (db->xoffset < l->len) {
1318 mateusz.vi 478 
      unsigned char i, limit;
479 
      if (l->len - db->xoffset < screenw) {
480 
        limit = l->len;
481 
      } else {
1427 mateusz.vi 482 
        limit = db->xoffset + screenlastcol;
1318 mateusz.vi 483 
      }
1333 mateusz.vi 484 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 485 
    }
1282 mateusz.vi 486 
 
1318 mateusz.vi 487 
    /* write empty spaces until end of line */
1427 mateusz.vi 488 
    if (x < screenlastcol) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenlastcol - x);
1318 mateusz.vi 489 
 
1288 mateusz.vi 490 
#ifdef DBG_REFRESH
1333 mateusz.vi 491 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 492 
#endif
1282 mateusz.vi 493 
 
1275 mateusz.vi 494 
    if (y == screenh - 2) break;
495 
  }
1310 mateusz.vi 496 
 
1319 mateusz.vi 497 
  /* fill all lines below if empty (and they need to be redrawn) */
498 
  if (l == NULL) {
1427 mateusz.vi 499 
    while ((y < screenlastrow) && (y < uidirty.to)) {
500 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenlastcol);
1319 mateusz.vi 501 
    }
1318 mateusz.vi 502 
  }
1328 mateusz.vi 503 
 
504 
  /* scroll bar */
1427 mateusz.vi 505 
  for (y = 0; y < screenlastrow; y++) {
506 
    mdr_cout_char(y, screenlastcol, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 507 
  }
508 
 
509 
  /* scroll cursor */
510 
  if (db->totlines >= screenh) {
511 
    unsigned short topline = db->curline - db->cursorposy;
512 
    unsigned short col;
513 
    unsigned short totlines = db->totlines - screenh + 1;
514 
    if (db->totlines - screenh > screenh) {
1427 mateusz.vi 515 
      col = topline / (totlines / screenlastrow);
1328 mateusz.vi 516 
    } else {
1427 mateusz.vi 517 
      col = topline * screenlastrow / totlines;
1328 mateusz.vi 518 
    }
1427 mateusz.vi 519 
    if (col >= screenlastrow) col = screenh - 2;
520 
    mdr_cout_char(col, screenlastcol, ' ', SCHEME_SCROLL);
1328 mateusz.vi 521 
  }
1392 mateusz.vi 522 
 
523 
  /* clear out the dirty flag */
524 
  uidirty.from = 0xff;
1275 mateusz.vi 525 
}
526 
 
527 
 
1327 mateusz.vi 528 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 529 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 530 
 
531 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 532 
    db->cursorposx = 0;
1275 mateusz.vi 533 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 534 
    uidirty.from = 0;
535 
    uidirty.to = 0xff;
1275 mateusz.vi 536 
  } else {
1316 mateusz.vi 537 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 538 
  }
539 
}
540 
 
541 
 
1327 mateusz.vi 542 
static void cursor_up(struct file *db) {
1422 mateusz.vi 543 
  if (db->cursor->prev == NULL) return;
544 
 
545 
  db->curline -= 1;
546 
  db->cursor = db->cursor->prev;
547 
  if (db->cursorposy == 0) {
548 
    uidirty.from = 0;
549 
    uidirty.to = 0xff;
550 
  } else {
551 
    db->cursorposy -= 1;
1275 mateusz.vi 552 
  }
553 
}
554 
 
555 
 
1327 mateusz.vi 556 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 557 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 558 
  if (db->xoffset > db->cursor->len) {
559 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 560 
    uidirty.from = 0;
561 
    uidirty.to = 0xff;
1282 mateusz.vi 562 
  }
563 
 
1427 mateusz.vi 564 
  if (db->xoffset + screenlastcol <= db->cursor->len) {
1282 mateusz.vi 565 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 566 
    uidirty.from = 0;
567 
    uidirty.to = 0xff;
1282 mateusz.vi 568 
  }
1316 mateusz.vi 569 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 570 
}
571 
 
572 
 
1327 mateusz.vi 573 
static void cursor_down(struct file *db) {
1422 mateusz.vi 574 
  if (db->cursor->next == NULL) return;
575 
 
576 
  db->curline += 1;
577 
  db->cursor = db->cursor->next;
578 
  if (db->cursorposy < screenh - 2) {
579 
    db->cursorposy += 1;
580 
  } else {
581 
    uidirty.from = 0;
582 
    uidirty.to = 0xff;
1276 mateusz.vi 583 
  }
584 
}
585 
 
586 
 
1327 mateusz.vi 587 
static void cursor_left(struct file *db) {
1316 mateusz.vi 588 
  if (db->cursorposx > 0) {
589 
    db->cursorposx -= 1;
1302 mateusz.vi 590 
  } else if (db->xoffset > 0) {
591 
    db->xoffset -= 1;
1327 mateusz.vi 592 
    uidirty.from = 0;
593 
    uidirty.to = 0xff;
1302 mateusz.vi 594 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 595 
    cursor_up(db);
596 
    cursor_eol(db);
1302 mateusz.vi 597 
  }
598 
}
599 
 
600 
 
1327 mateusz.vi 601 
static void cursor_home(struct file *db) {
1316 mateusz.vi 602 
  db->cursorposx = 0;
1282 mateusz.vi 603 
  if (db->xoffset != 0) {
604 
    db->xoffset = 0;
1327 mateusz.vi 605 
    uidirty.from = 0;
606 
    uidirty.to = 0xff;
1282 mateusz.vi 607 
  }
1276 mateusz.vi 608 
}
609 
 
610 
 
1327 mateusz.vi 611 
static void cursor_right(struct file *db) {
1316 mateusz.vi 612 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
613 
    if (db->cursorposx < screenw - 2) {
614 
      db->cursorposx += 1;
1308 mateusz.vi 615 
    } else {
616 
      db->xoffset += 1;
1327 mateusz.vi 617 
      uidirty.from = 0;
618 
      uidirty.to = 0xff;
1308 mateusz.vi 619 
    }
1357 mateusz.vi 620 
  } else if (db->cursor->next != NULL) { /* jump to start of next line */
1327 mateusz.vi 621 
    cursor_down(db);
622 
    cursor_home(db);
1308 mateusz.vi 623 
  }
624 
}
625 
 
626 
 
1327 mateusz.vi 627 
static void del(struct file *db) {
1316 mateusz.vi 628 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
1568 mateusz.vi 629 
    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 630 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 631 
    uidirty.from = db->cursorposy;
632 
    uidirty.to = db->cursorposy;
1393 mateusz.vi 633 
    db->modflag = 1;
1292 mateusz.vi 634 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
635 
    struct line far *nextline = db->cursor->next;
636 
    if (db->cursor->next->len > 0) {
1340 mateusz.vi 637 
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
1568 mateusz.vi 638 
        fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 639 
        db->cursor->len += db->cursor->next->len;
640 
      }
641 
    }
1340 mateusz.vi 642 
 
1292 mateusz.vi 643 
    db->cursor->next = db->cursor->next->next;
644 
    db->cursor->next->prev = db->cursor;
1340 mateusz.vi 645 
 
1339 mateusz.vi 646 
    line_free(nextline);
1327 mateusz.vi 647 
    uidirty.from = db->cursorposy;
648 
    uidirty.to = 0xff;
1328 mateusz.vi 649 
    db->totlines -= 1;
1393 mateusz.vi 650 
    db->modflag = 1;
1292 mateusz.vi 651 
  }
652 
}
653 
 
654 
 
1327 mateusz.vi 655 
static void bkspc(struct file *db) {
1302 mateusz.vi 656 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1421 mateusz.vi 657 
  if ((db->cursorposx + db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 658 
 
1327 mateusz.vi 659 
  cursor_left(db);
660 
  del(db);
1302 mateusz.vi 661 
}
662 
 
663 
 
1450 mateusz.vi 664 
#define LOADFILE_FILENOTFOUND 2
665 
 
1346 mateusz.vi 666 
/* returns 0 on success, 1 on file not found, 2 on other error */
1449 mateusz.vi 667 
static unsigned char loadfile(struct file *db, const char *fname) {
1324 mateusz.vi 668 
  char *buffptr;
1556 mateusz.vi 669 
  unsigned short len, llen;
670 
  unsigned short fd;
1324 mateusz.vi 671 
  unsigned char eolfound;
1449 mateusz.vi 672 
  unsigned char err = 0;
1287 mateusz.vi 673 
 
1355 mateusz.vi 674 
  /* free the entire linked list of lines */
675 
  db_rewind(db);
676 
  while (db->cursor) {
677 
    struct line far *victim;
678 
    victim = db->cursor;
679 
    db->cursor = db->cursor->next;
680 
    line_free(victim);
681 
  }
1321 mateusz.vi 682 
 
1551 mateusz.vi 683 
  /* zero out the struct (take care to preserve the id of the slot, though) */
684 
  {
685 
    unsigned char slotid = db->slotid;
686 
    bzero(db, sizeof(struct file));
687 
    db->slotid = slotid;
688 
  }
1355 mateusz.vi 689 
 
1448 mateusz.vi 690 
  /* start by adding an empty line */
691 
  if (line_add(db, NULL, 0) != 0) return(2);
692 
 
1418 mateusz.vi 693 
  if (fname == NULL) goto SKIPLOADING;
1321 mateusz.vi 694 
 
1543 mateusz.vi 695 
  /* make the filename canonical (DOS 3+ only, on earlier versions it just copies the filename) */
696 
  mdr_dos_truename(db->fname, fname);
1355 mateusz.vi 697 
 
1565 mateusz.vi 698 
  /* fopen file */
699 
  fd = 0;
700 
  _asm {
701 
    push cx
702 
    push dx
703 
 
704 
    mov ax, 0x3d00
705 
    mov dx, fname   // works only in SMALL memory model!
706 
    xor cl, cl
707 
    int 0x21
708 
    mov fd, ax
709 
    jnc done
710 
    mov err, al
711 
    done:
712 
 
713 
    pop dx
714 
    pop cx
715 
  }
716 
 
1450 mateusz.vi 717 
  if (err != 0) goto SKIPLOADING;
1287 mateusz.vi 718 
 
1313 mateusz.vi 719 
  db->lfonly = 1;
720 
 
1324 mateusz.vi 721 
  for (eolfound = 0;;) {
722 
    unsigned short consumedbytes;
723 
 
1556 mateusz.vi 724 
    if ((mdr_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
1324 mateusz.vi 725 
    buffptr = buff;
726 
 
727 
    FINDLINE:
728 
 
1361 mateusz.vi 729 
    /* look for nearest \n (also expand tabs) */
1324 mateusz.vi 730 
    for (consumedbytes = 0;; consumedbytes++) {
1361 mateusz.vi 731 
 
732 
      if (buffptr[consumedbytes] == '\t') {
733 
        llen = consumedbytes;
734 
        break;
735 
      }
736 
 
1324 mateusz.vi 737 
      if (consumedbytes == len) {
738 
        llen = consumedbytes;
739 
        break;
1323 mateusz.vi 740 
      }
1324 mateusz.vi 741 
      if (buffptr[consumedbytes] == '\r') {
742 
        llen = consumedbytes;
743 
        consumedbytes++;
744 
        db->lfonly = 0;
1320 mateusz.vi 745 
        break;
746 
      }
1324 mateusz.vi 747 
      if (buffptr[consumedbytes] == '\n') {
748 
        eolfound = 1;
749 
        llen = consumedbytes;
750 
        consumedbytes++;
751 
        break;
752 
      }
1287 mateusz.vi 753 
    }
1324 mateusz.vi 754 
 
755 
    /* consumedbytes is the amount of bytes processed from buffptr,
756 
     * llen is the length of line's payload (without its line terminator) */
757 
 
758 
    /* append content, if line is non-empty */
759 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1339 mateusz.vi 760 
      goto IOERR;
1287 mateusz.vi 761 
    }
762 
 
1419 mateusz.vi 763 
    /* allocate the next line if current line ended */
1324 mateusz.vi 764 
    if (eolfound) {
1328 mateusz.vi 765 
      if (line_add(db, NULL, 0) != 0) {
1339 mateusz.vi 766 
        goto IOERR;
1324 mateusz.vi 767 
      }
768 
      eolfound = 0;
769 
    }
1287 mateusz.vi 770 
 
1361 mateusz.vi 771 
    /* append 8 spaces if tab char found */
1412 mateusz.vi 772 
    if ((consumedbytes < len) && (buffptr[consumedbytes] == '\t') && (glob_tablessmode == 0)) {
1361 mateusz.vi 773 
      consumedbytes++;
774 
      if (line_append(db, "        ", 8) != 0) {
775 
        goto IOERR;
776 
      }
777 
    }
778 
 
1324 mateusz.vi 779 
    /* anything left? process the buffer leftover again */
780 
    if (consumedbytes < len) {
781 
      len -= consumedbytes;
782 
      buffptr += consumedbytes;
783 
      goto FINDLINE;
784 
    }
785 
 
786 
  }
787 
 
1556 mateusz.vi 788 
  mdr_dos_fclose(fd);
1287 mateusz.vi 789 
 
1321 mateusz.vi 790 
  SKIPLOADING:
791 
 
1448 mateusz.vi 792 
  /* rewind cursor to top of file because it has been used by line_add() */
1339 mateusz.vi 793 
  db_rewind(db);
1320 mateusz.vi 794 
 
1448 mateusz.vi 795 
  return(err);
1339 mateusz.vi 796 
 
797 
  IOERR:
1556 mateusz.vi 798 
  mdr_dos_fclose(fd);
1450 mateusz.vi 799 
  return(1);
1287 mateusz.vi 800 
}
801 
 
802 
 
1356 mateusz.vi 803 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
804 
 * of argc and argv, saves some 330 bytes of binary size
805 
 * returns non-zero on error */
806 
static int parseargv(struct file *dbarr) {
807 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
808 
  unsigned short count = 0;
809 
  char *arg;
810 
  unsigned short lastarg = 0;
1449 mateusz.vi 811 
  unsigned char err;
1356 mateusz.vi 812 
 
813 
  while (!lastarg) {
814 
    /* jump to nearest arg */
815 
    while (*tail == ' ') {
816 
      *tail = 0;
817 
      tail++;
818 
    }
819 
 
820 
    if (*tail == '\r') {
821 
      *tail = 0;
822 
      break;
823 
    }
824 
 
825 
    arg = tail;
826 
 
827 
    /* jump to next delimiter */
828 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
829 
 
830 
    /* if \r then remember this is the last arg */
831 
    if (*tail == '\r') lastarg = 1;
832 
 
833 
    *tail = 0;
834 
    tail++;
835 
 
836 
    /* look at the arg now */
837 
    if (*arg == '/') {
1412 mateusz.vi 838 
      if (arg[1] == 't') { /* /t = do not expand tabs */
839 
        glob_tablessmode = 1;
840 
 
841 
      } else if (arg[1] == 'm') { /* /m = force mono mode */
842 
        glob_monomode = 1;
843 
 
844 
      } else {  /* help screen */
1419 mateusz.vi 845 
        mdr_coutraw_str(svarlang_str(1,3)); /* Sved, the SvarDOS editor */
1412 mateusz.vi 846 
        mdr_coutraw_str(" [");
1419 mateusz.vi 847 
        mdr_coutraw_str(svarlang_str(1,4)); /* ver */
1412 mateusz.vi 848 
        mdr_coutraw_puts(" " PVER "]");
849 
        mdr_coutraw_puts("Copyright (C) " PDATE " Mateusz Viste");
850 
        mdr_coutraw_crlf();
1433 mateusz.vi 851 
        mdr_coutraw_str("sved [/m] [/t] ");
1412 mateusz.vi 852 
        mdr_coutraw_puts(svarlang_str(1,1)); /* args syntax */
853 
        mdr_coutraw_crlf();
854 
        mdr_coutraw_puts(svarlang_str(1,10)); /* /m */
855 
        mdr_coutraw_puts(svarlang_str(1,11)); /* /t */
856 
        return(-1);
1387 mateusz.vi 857 
      }
1412 mateusz.vi 858 
      continue;
1356 mateusz.vi 859 
    }
860 
 
861 
    /* looks to be a filename */
862 
    if (count == 10) {
1420 mateusz.vi 863 
      mdr_coutraw_puts(svarlang_str(0,12)); /* too many files */
864 
      return(-1);
1356 mateusz.vi 865 
    }
866 
 
867 
    /* try loading it */
1387 mateusz.vi 868 
    mdr_coutraw_str(svarlang_str(1,2));
869 
    mdr_coutraw_char(' ');
1356 mateusz.vi 870 
    mdr_coutraw_puts(arg);
871 
    err = loadfile(&(dbarr[count]), arg);
872 
    if (err) {
1450 mateusz.vi 873 
      if (err == LOADFILE_FILENOTFOUND) { /* file not found */
1396 mateusz.vi 874 
        if ((count == 0) && (lastarg != 0)) { /* a 'file not found' is fine if only one file was given */
875 
          err = 0;
876 
        } else {
877 
          err = 11;
878 
        }
1356 mateusz.vi 879 
      } else { /* general error */
880 
        err = 10;
881 
      }
1396 mateusz.vi 882 
      if (err) {
883 
        mdr_coutraw_puts(svarlang_str(0,err));
884 
        return(-1);
885 
      }
1356 mateusz.vi 886 
    }
887 
    count++;
888 
  }
889 
 
890 
  return(0);
891 
}
892 
 
893 
 
1327 mateusz.vi 894 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1340 mateusz.vi 895 
  if (curline_resize(db, db->cursor->len + len) == 0) {
1317 mateusz.vi 896 
    unsigned short off = db->xoffset + db->cursorposx;
1393 mateusz.vi 897 
    db->modflag = 1;
1568 mateusz.vi 898 
    fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
1317 mateusz.vi 899 
    db->cursor->len += len;
1327 mateusz.vi 900 
    uidirty.from = db->cursorposy;
901 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 902 
    while (len--) {
903 
      db->cursor->payload[off++] = *databuf;
904 
      databuf++;
1327 mateusz.vi 905 
      cursor_right(db);
1317 mateusz.vi 906 
    }
907 
  }
908 
}
909 
 
910 
 
1343 mateusz.vi 911 
/* recompute db->curline by counting nodes in linked list */
912 
static void recompute_curline(struct file *db) {
913 
  const struct line far *l = db->cursor;
914 
 
915 
  db->curline = 0;
916 
  while (l->prev != NULL) {
917 
    db->curline += 1;
918 
    l = l->prev;
919 
  }
920 
}
921 
 
922 
 
1354 mateusz.vi 923 
enum MENU_ACTION {
1393 mateusz.vi 924 
  MENU_NONE   = 0,
925 
  MENU_OPEN   = 1,
926 
  MENU_SAVE   = 2,
927 
  MENU_SAVEAS = 3,
928 
  MENU_CLOSE  = 4,
929 
  MENU_CHGEOL = 5,
1418 mateusz.vi 930 
  MENU_QUIT   = 6
1354 mateusz.vi 931 
};
932 
 
933 
static enum MENU_ACTION ui_menu(void) {
934 
  unsigned short i, curchoice, attr, x, slen;
1393 mateusz.vi 935 
  unsigned short xorigin, yorigin;
1354 mateusz.vi 936 
 
937 
  /* find out the longest string */
938 
  slen = 0;
1355 mateusz.vi 939 
  for (i = MENU_OPEN; i <= MENU_QUIT; i++) {
1354 mateusz.vi 940 
    x = strlen(svarlang_str(8, i));
941 
    if (x > slen) slen = x;
942 
  }
943 
 
1393 mateusz.vi 944 
  /* calculate where to draw the menu on screen */
945 
  xorigin = (screenw - (slen + 5)) / 2;
1395 mateusz.vi 946 
  yorigin = (screenh - (MENU_QUIT - MENU_OPEN + 6)) / 2;
1393 mateusz.vi 947 
 
1395 mateusz.vi 948 
  /* */
949 
  uidirty.from = yorigin;
950 
  uidirty.to = 0xff;
951 
  uidirty.statusbar = 1;
952 
 
953 
  /* hide the cursor */
954 
  mdr_cout_cursor_hide();
955 
 
1355 mateusz.vi 956 
  curchoice = MENU_OPEN;
1354 mateusz.vi 957 
  for (;;) {
958 
    /* render menu */
1393 mateusz.vi 959 
    for (i = MENU_NONE; i <= MENU_QUIT + 1; i++) {
960 
      mdr_cout_char_rep(yorigin + i, xorigin, ' ', SCHEME_MENU, slen+4);
1354 mateusz.vi 961 
      if (i == curchoice) {
962 
        attr = SCHEME_MENU_CUR;
1415 mateusz.vi 963 
        mdr_cout_char_rep(yorigin + i, xorigin + 1, ' ', SCHEME_MENU_SEL, slen + 2);
1354 mateusz.vi 964 
      } else {
965 
        attr = SCHEME_MENU;
966 
      }
1416 mateusz.vi 967 
      mdr_cout_str(yorigin + i, xorigin + 2, svarlang_str(8, i), attr, slen);
1354 mateusz.vi 968 
    }
969 
    /* wait for key */
1410 mateusz.vi 970 
    switch (mdr_dos_getkey2()) {
1354 mateusz.vi 971 
      case 0x150: /* down */
972 
        if (curchoice == MENU_QUIT) {
1355 mateusz.vi 973 
          curchoice = MENU_OPEN;
1354 mateusz.vi 974 
        } else {
975 
          curchoice++;
976 
        }
977 
        break;
978 
      case 0x148: /* up */
1355 mateusz.vi 979 
        if (curchoice == MENU_OPEN) {
1354 mateusz.vi 980 
          curchoice = MENU_QUIT;
981 
        } else {
982 
          curchoice--;
983 
        }
984 
        break;
1395 mateusz.vi 985 
      default:
986 
        curchoice = MENU_NONE;
987 
        /* FALLTHRU */
988 
      case '\r': /* ENTER */
989 
        mdr_cout_cursor_show();
990 
        return(curchoice);
1354 mateusz.vi 991 
    }
992 
  }
993 
}
994 
 
995 
 
1549 mateusz.vi 996 
static struct file *select_slot(struct file *dbarr, unsigned short curfile) {
1355 mateusz.vi 997 
  uidirty.from = 0;
998 
  uidirty.to = 0xff;
999 
  uidirty.statusbar = 1;
1000 
 
1001 
  dbarr = &(dbarr[curfile]);
1549 mateusz.vi 1002 
 
1415 mateusz.vi 1003 
  /* force redraw now, because the main() routine might not if this is exit
1004 
   * time and we want to show the user which file has unsaved changes */
1549 mateusz.vi 1005 
  ui_statusbar(dbarr);
1355 mateusz.vi 1006 
  ui_refresh(dbarr);
1007 
  return(dbarr);
1008 
}
1009 
 
1010 
 
1347 mateusz.vi 1011 
/* main returns nothing, ie. sved always exits with a zero exit code
1012 
 * (this saves 20 bytes of executable footprint) */
1013 
void main(void) {
1355 mateusz.vi 1014 
  static struct file dbarr[10];
1015 
  struct file *db = dbarr; /* visible file is the first slot by default */
1548 mateusz.vi 1016 
  static struct line far *clipboard;
1538 mateusz.vi 1017 
  static unsigned char original_breakflag;
1275 mateusz.vi 1018 
 
1418 mateusz.vi 1019 
  { /* load NLS resource */
1364 mateusz.vi 1020 
    unsigned short i = 0;
1021 
    const char far *selfptr;
1548 mateusz.vi 1022 
    char lang[8];
1364 mateusz.vi 1023 
    selfptr = mdr_dos_selfexe();
1024 
    if (selfptr != NULL) {
1025 
      do {
1548 mateusz.vi 1026 
        buff[i] = selfptr[i];
1027 
      } while (buff[i++] != 0);
1028 
      svarlang_autoload_exepath(buff, mdr_dos_getenv(lang, "LANG", sizeof(lang)));
1364 mateusz.vi 1029 
    }
1307 mateusz.vi 1030 
  }
1282 mateusz.vi 1031 
 
1355 mateusz.vi 1032 
  /* preload all slots with empty files */
1549 mateusz.vi 1033 
  {
1034 
    unsigned short i;
1035 
    for (i = 0; i < 10; i++) {
1036 
      loadfile(&(dbarr[i]), NULL);
1037 
      dbarr[i].slotid = i;
1038 
    }
1355 mateusz.vi 1039 
  }
1040 
 
1356 mateusz.vi 1041 
  /* parse argv (and load files, if any passed on) */
1042 
  if (parseargv(dbarr) != 0) return;
1282 mateusz.vi 1043 
 
1412 mateusz.vi 1044 
  if ((mdr_cout_init(&screenw, &screenh) != 0) && (glob_monomode == 0)) {
1333 mateusz.vi 1045 
    /* load color scheme if mdr_cout_init returns a color flag */
1046 
    SCHEME_TEXT = 0x17;
1354 mateusz.vi 1047 
    SCHEME_MENU = 0x70;
1388 mateusz.vi 1048 
    SCHEME_MENU_CUR = 0x6f;
1049 
    SCHEME_MENU_SEL = 0x66;
1333 mateusz.vi 1050 
    SCHEME_STBAR1 = 0x70;
1051 
    SCHEME_STBAR2 = 0x78;
1392 mateusz.vi 1052 
    SCHEME_STBAR3 = 0x3f;
1333 mateusz.vi 1053 
    SCHEME_SCROLL = 0x70;
1388 mateusz.vi 1054 
    SCHEME_MSG = 0x6f;
1333 mateusz.vi 1055 
    SCHEME_ERR = 0x4f;
1056 
  }
1427 mateusz.vi 1057 
  screenlastrow = screenh - 1;
1058 
  screenlastcol = screenw - 1;
1275 mateusz.vi 1059 
 
1414 mateusz.vi 1060 
  /* instruct DOS to stop detecting CTRL+C because user needs it for
1061 
   * copy/paste operations. also remember the original status of the BREAK
1062 
   * flag so I can restore it as it was before quitting. */
1063 
  original_breakflag = mdr_dos_ctrlc_disable();
1410 mateusz.vi 1064 
 
1275 mateusz.vi 1065 
  for (;;) {
1066 
    int k;
1067 
 
1362 mateusz.vi 1068 
    /* add an extra empty line if cursor is on last line and this line is not empty */
1069 
    if ((db->cursor->next == NULL) && (db->cursor->len != 0)) {
1070 
      if (line_add(db, NULL, 0) == 0) {
1071 
        db->cursor = db->cursor->prev; /* line_add() changes the cursor pointer */
1437 mateusz.vi 1072 
        db->curline -= 1;
1362 mateusz.vi 1073 
      }
1074 
    }
1075 
 
1327 mateusz.vi 1076 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 1077 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 1078 
 
1392 mateusz.vi 1079 
    ui_refresh(db);
1080 
 
1436 mateusz.vi 1081 
    if ((uidirty.statusbar != 0) || (db->modflagprev != db->modflag) || (db->curline_prev != db->curline)) {
1549 mateusz.vi 1082 
      ui_statusbar(db);
1342 mateusz.vi 1083 
      uidirty.statusbar = 0;
1355 mateusz.vi 1084 
      db->modflagprev = db->modflag;
1436 mateusz.vi 1085 
      db->curline_prev = db->curline;
1342 mateusz.vi 1086 
    }
1328 mateusz.vi 1087 
#ifdef DBG_LINENUM
1088 
      {
1089 
        char ddd[10];
1090 
        db->curline += 1;
1091 
        ddd[0] = '0' + db->curline / 100;
1092 
        ddd[1] = '0' + (db->curline % 100) / 10;
1093 
        ddd[2] = '0' + (db->curline % 10);
1094 
        db->curline -= 1;
1095 
        ddd[3] = '/';
1096 
        ddd[4] = '0' + db->totlines / 100;
1097 
        ddd[5] = '0' + (db->totlines % 100) / 10;
1098 
        ddd[6] = '0' + (db->totlines % 10);
1099 
        ddd[7] = 0;
1333 mateusz.vi 1100 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 1101 
      }
1102 
#endif
1275 mateusz.vi 1103 
 
1410 mateusz.vi 1104 
    k = mdr_dos_getkey2();
1282 mateusz.vi 1105 
 
1275 mateusz.vi 1106 
    if (k == 0x150) { /* down */
1327 mateusz.vi 1107 
      cursor_down(db);
1275 mateusz.vi 1108 
 
1109 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 1110 
      cursor_up(db);
1275 mateusz.vi 1111 
 
1112 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 1113 
      cursor_right(db);
1275 mateusz.vi 1114 
 
1115 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 1116 
      cursor_left(db);
1275 mateusz.vi 1117 
 
1282 mateusz.vi 1118 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 1119 
      unsigned char dist = db->cursorposy + screenh - 1;
1120 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
1121 
        db->cursor = db->cursor->prev;
1122 
        dist--;
1123 
      }
1124 
      if (dist != 0) {
1125 
        db->cursorposy = 0;
1126 
        db->cursorposx = 0;
1127 
      } else {
1128 
        dist = db->cursorposy;
1129 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
1130 
      }
1131 
      uidirty.from = 0;
1132 
      uidirty.to = 0xff;
1343 mateusz.vi 1133 
      recompute_curline(db);
1282 mateusz.vi 1134 
 
1135 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 1136 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
1137 
      while ((dist != 0) && (db->cursor->next != NULL)) {
1138 
        db->cursor = db->cursor->next;
1139 
        dist--;
1140 
      }
1141 
      if (dist != 0) {
1142 
        db->cursorposy = screenh - 2;
1143 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
1144 
        db->cursorposx = 0;
1145 
      } else {
1146 
        dist = screenh - 2 - db->cursorposy;
1147 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
1148 
      }
1149 
      uidirty.from = 0;
1150 
      uidirty.to = 0xff;
1343 mateusz.vi 1151 
      recompute_curline(db);
1282 mateusz.vi 1152 
 
1153 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 1154 
       cursor_home(db);
1282 mateusz.vi 1155 
 
1156 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 1157 
       cursor_eol(db);
1282 mateusz.vi 1158 
 
1275 mateusz.vi 1159 
    } else if (k == 0x1B) { /* ESC */
1354 mateusz.vi 1160 
      int quitnow = 0;
1394 mateusz.vi 1161 
      char fname[64];
1354 mateusz.vi 1162 
      int saveflag = 0;
1393 mateusz.vi 1163 
      enum MENU_ACTION ui_action;
1275 mateusz.vi 1164 
 
1392 mateusz.vi 1165 
      /* collect the exact menu action and clear the screen */
1166 
      ui_action = ui_menu();
1167 
      ui_refresh(db);
1354 mateusz.vi 1168 
 
1392 mateusz.vi 1169 
      switch (ui_action) {
1170 
 
1354 mateusz.vi 1171 
        case MENU_NONE:
1172 
          break;
1173 
 
1174 
        case MENU_OPEN:
1175 
          /* display a warning if unsaved changes are pending */
1547 mateusz.vi 1176 
          if (db->modflag != 0) ui_msg(4, 8, 0, SCHEME_MSG);
1354 mateusz.vi 1177 
 
1178 
          /* ask for filename */
1179 
          ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
1180 
          if (fname[0] != 0) {
1449 mateusz.vi 1181 
            unsigned char err;
1354 mateusz.vi 1182 
            err = loadfile(db, fname);
1183 
            if (err != 0) {
1450 mateusz.vi 1184 
              if (err == LOADFILE_FILENOTFOUND) {
1547 mateusz.vi 1185 
                ui_msg(11, 0, 0, SCHEME_ERR); /* file not found */
1354 mateusz.vi 1186 
              } else {
1547 mateusz.vi 1187 
                ui_msg(10, 0, 0, SCHEME_ERR);  /* ERROR */
1354 mateusz.vi 1188 
              }
1189 
              mdr_bios_tickswait(44); /* 3s */
1418 mateusz.vi 1190 
              loadfile(db, NULL);
1354 mateusz.vi 1191 
            }
1192 
          }
1393 mateusz.vi 1193 
          uidirty.from = 0;
1194 
          uidirty.to = 0xff;
1195 
          uidirty.statusbar = 1;
1354 mateusz.vi 1196 
          break;
1197 
 
1198 
        case MENU_SAVEAS:
1199 
          saveflag = 1;
1200 
          /* FALLTHRU */
1201 
        case MENU_SAVE:
1202 
          if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
1203 
            ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
1204 
            if (*fname == 0) break;
1205 
            saveflag = savefile(db, fname);
1206 
          } else {
1207 
            saveflag = savefile(db, NULL);
1208 
          }
1209 
 
1395 mateusz.vi 1210 
          mdr_cout_cursor_hide();
1211 
 
1354 mateusz.vi 1212 
          if (saveflag == 0) {
1547 mateusz.vi 1213 
            ui_msg(2, 0, 0, SCHEME_MSG);
1354 mateusz.vi 1214 
            mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
1215 
          } else {
1547 mateusz.vi 1216 
            ui_msg(10, 0, 0, SCHEME_ERR);
1354 mateusz.vi 1217 
            mdr_bios_tickswait(36); /* 2s */
1218 
          }
1395 mateusz.vi 1219 
          mdr_cout_cursor_show();
1354 mateusz.vi 1220 
          break;
1221 
 
1355 mateusz.vi 1222 
        case MENU_CLOSE:
1223 
          if (ui_confirm_if_unsaved(db) == 0) {
1418 mateusz.vi 1224 
            loadfile(db, NULL);
1355 mateusz.vi 1225 
          }
1226 
          uidirty.from = 0;
1227 
          uidirty.to = 0xff;
1228 
          uidirty.statusbar = 1;
1229 
          break;
1230 
 
1354 mateusz.vi 1231 
        case MENU_CHGEOL:
1393 mateusz.vi 1232 
          db->modflag = 1;
1354 mateusz.vi 1233 
          db->lfonly ^= 1;
1234 
          break;
1235 
 
1236 
        case MENU_QUIT:
1355 mateusz.vi 1237 
          quitnow = 1;
1549 mateusz.vi 1238 
          {
1239 
            unsigned short curfile;
1240 
            for (curfile = 0; curfile < 10; curfile++) {
1241 
              if (dbarr[curfile].modflag == 0) continue; /* skip unmodified slots */
1355 mateusz.vi 1242 
              db = select_slot(dbarr, curfile);
1441 mateusz.vi 1243 
              if (ui_confirm_if_unsaved(db) != 0) {
1244 
                quitnow = 0;
1245 
                break;
1246 
              }
1355 mateusz.vi 1247 
            }
1248 
          }
1354 mateusz.vi 1249 
          break;
1250 
      }
1251 
 
1252 
      if (quitnow) break;
1253 
 
1289 mateusz.vi 1254 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 1255 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 1256 
      /* add a new line */
1328 mateusz.vi 1257 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1393 mateusz.vi 1258 
        db->modflag = 1;
1328 mateusz.vi 1259 
        db->cursor = db->cursor->prev; /* back to original line */
1427 mateusz.vi 1260 
        db->curline -= 1;
1289 mateusz.vi 1261 
        /* trim the line above */
1328 mateusz.vi 1262 
        db->cursor->len = off;
1289 mateusz.vi 1263 
        /* move cursor to the (new) line below */
1328 mateusz.vi 1264 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 1265 
        uidirty.to = 0xff;
1328 mateusz.vi 1266 
        cursor_down(db);
1267 
        cursor_home(db);
1289 mateusz.vi 1268 
      } else {
1269 
        /* ERROR: OUT OF MEMORY */
1270 
      }
1271 
 
1292 mateusz.vi 1272 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 1273 
      del(db);
1292 mateusz.vi 1274 
 
1302 mateusz.vi 1275 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 1276 
      bkspc(db);
1302 mateusz.vi 1277 
 
1308 mateusz.vi 1278 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 1279 
      char c = k;
1327 mateusz.vi 1280 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 1281 
 
1317 mateusz.vi 1282 
    } else if (k == 0x009) { /* TAB */
1412 mateusz.vi 1283 
      if (glob_tablessmode == 0) {
1284 
        insert_in_line(db, "        ", 8);
1285 
      } else {
1286 
        insert_in_line(db, "\t", 1);
1287 
      }
1317 mateusz.vi 1288 
 
1355 mateusz.vi 1289 
    } else if ((k >= 0x13b) && (k <= 0x144)) { /* F1..F10 */
1549 mateusz.vi 1290 
      db = select_slot(dbarr, k - 0x13b);
1309 mateusz.vi 1291 
 
1325 mateusz.vi 1292 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
1293 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
1294 
      for (;;) {
1295 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
1296 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 1297 
        cursor_right(db);
1325 mateusz.vi 1298 
      }
1299 
      /* now skip to next non-space or end of file */
1300 
      for (;;) {
1327 mateusz.vi 1301 
        cursor_right(db);
1325 mateusz.vi 1302 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1303 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
1304 
      }
1305 
 
1306 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 1307 
      cursor_left(db);
1325 mateusz.vi 1308 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
1309 
      for (;;) {
1310 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
1311 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 1312 
        cursor_left(db);
1325 mateusz.vi 1313 
      }
1314 
      /* now skip to next space or start of file */
1315 
      for (;;) {
1327 mateusz.vi 1316 
        cursor_left(db);
1325 mateusz.vi 1317 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 1318 
          cursor_right(db);
1325 mateusz.vi 1319 
          break;
1320 
        }
1321 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
1322 
      }
1323 
 
1410 mateusz.vi 1324 
    } else if ((k == 0x003) || (k == 0x018)) { /* CTRL+C or CTRL+X */
1325 
      /* free clipboard if anything in it */
1326 
      if (clipboard != NULL) line_free(clipboard);
1327 
 
1328 
      /* copy cursor line to clipboard */
1329 
      clipboard = line_calloc(db->cursor->len);
1330 
      if (clipboard == NULL) {
1547 mateusz.vi 1331 
        ui_msg(10, 0, 0, SCHEME_ERR); /* ERROR */
1410 mateusz.vi 1332 
        mdr_bios_tickswait(18); /* 1s */
1333 
      } else {
1427 mateusz.vi 1334 
        mdr_cout_char_rep(db->cursorposy, 0, ' ', ((SCHEME_TEXT >> 4) | (SCHEME_TEXT << 4)) & 0xff, screenlastcol);
1410 mateusz.vi 1335 
        uidirty.from = db->cursorposy;
1336 
        uidirty.to = db->cursorposy;
1337 
        if (db->cursor->len != 0) {
1568 mateusz.vi 1338 
          fmemmove(clipboard->payload, db->cursor->payload, db->cursor->len);
1410 mateusz.vi 1339 
          clipboard->len = db->cursor->len;
1340 
        }
1341 
        mdr_bios_tickswait(2); /* ca 100ms */
1342 
 
1343 
        /* if this is about cutting the line (CTRL+X) then delete cur line */
1344 
        if ((k == 0x018) && ((db->cursor->next != NULL) || (db->cursor->prev != NULL))) {
1345 
          if (db->cursor->next) db->cursor->next->prev = db->cursor->prev;
1346 
          if (db->cursor->prev) db->cursor->prev->next = db->cursor->next;
1347 
          clipboard->prev = db->cursor;
1348 
          if (db->cursor->next) {
1349 
            db->cursor = db->cursor->next;
1350 
          } else {
1351 
            cursor_up(db);
1352 
          }
1353 
          line_free(clipboard->prev);
1423 mateusz.vi 1354 
          db->totlines -= 1;
1552 mateusz.vi 1355 
          db->modflag = 1;
1410 mateusz.vi 1356 
          uidirty.from = 0;
1357 
          uidirty.to = 0xff;
1412 mateusz.vi 1358 
          recompute_curline(db);
1410 mateusz.vi 1359 
        }
1360 
      }
1361 
 
1420 mateusz.vi 1362 
    } else if ((k == 0x016) && (clipboard != NULL)) { /* CTRL+V */
1363 
      if (line_add(db, clipboard->payload, clipboard->len) != 0) {
1547 mateusz.vi 1364 
        ui_msg(10, 0, 0, SCHEME_ERR); /* ERROR */
1420 mateusz.vi 1365 
        mdr_bios_tickswait(18); /* 1s */
1366 
      } else {
1367 
        /* rewire the linked list so the new line is on top of the previous one */
1368 
        clipboard->prev = db->cursor->prev;
1369 
        /* remove prev node from list */
1370 
        db->cursor->prev = db->cursor->prev->prev;
1371 
        if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor;
1372 
        /* insert the node after cursor now */
1373 
        clipboard->prev->next = db->cursor->next;
1374 
        if (db->cursor->next != NULL) db->cursor->next->prev = clipboard->prev;
1375 
        clipboard->prev->prev = db->cursor;
1376 
        db->cursor->next = clipboard->prev;
1377 
        cursor_down(db);
1552 mateusz.vi 1378 
        db->modflag = 1;
1410 mateusz.vi 1379 
      }
1380 
      uidirty.from = 0;
1381 
      uidirty.to = 0xff;
1412 mateusz.vi 1382 
      recompute_curline(db);
1410 mateusz.vi 1383 
 
1333 mateusz.vi 1384 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 1385 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
1386 
      char buff[4];
1387 
      const char *HEX = "0123456789ABCDEF";
1388 
      buff[0] = HEX[(k >> 8) & 15];
1389 
      buff[1] = HEX[(k >> 4) & 15];
1390 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 1391 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
1392 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1410 mateusz.vi 1393 
      mdr_dos_getkey2();
1275 mateusz.vi 1394 
      break;
1333 mateusz.vi 1395 
#endif
1275 mateusz.vi 1396 
    }
1397 
  }
1398 
 
1399 
  mdr_cout_close();
1400 
 
1414 mateusz.vi 1401 
  /* restore the DOS BREAK flag if it was originally set */
1402 
  if (original_breakflag != 0) mdr_dos_ctrlc_enable();
1403 
 
1320 mateusz.vi 1404 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 1405 
 
1347 mateusz.vi 1406 
  return;
1275 mateusz.vi 1407 
}