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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 
 
1326 mateusz.vi 92 
/*****************************************************************************
93 
 * functions                                                                 *
94 
 *****************************************************************************/
95 
 
1339 mateusz.vi 96 
static struct line far *line_calloc(unsigned short siz) {
1342 mateusz.vi 97 
  struct line far *res;
1556 mateusz.vi 98 
  unsigned short seg;
1461 mateusz.vi 99 
 
1556 mateusz.vi 100 
  seg = mdr_dos_allocmem((sizeof(struct line) + siz + 15) / 16);
101 
  if (seg == 0) return(NULL);
1342 mateusz.vi 102 
  res = MK_FP(seg, 0);
1461 mateusz.vi 103 
  res->len = 0;
104 
  res->next = NULL;
105 
  res->prev = NULL;
106 
 
107 
  return(res);
1339 mateusz.vi 108 
}
109 
 
110 
 
111 
static void line_free(struct line far *ptr) {
112 
  _dos_freemem(FP_SEG(ptr));
113 
}
114 
 
115 
 
1550 mateusz.vi 116 
static int curline_resize(struct file *db, unsigned short newsiz) {
1339 mateusz.vi 117 
  struct line far *newptr;
118 
 
1341 mateusz.vi 119 
  /* try resizing the block (much faster) */
1557 mateusz.vi 120 
  if (mdr_dos_resizeblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor)) == 0) return(0);
1339 mateusz.vi 121 
 
122 
  /* create a new block and copy data over */
123 
  newptr = line_calloc(newsiz);
1340 mateusz.vi 124 
  if (newptr == NULL) return(-1);
125 
  _fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
126 
 
127 
  /* rewire the linked list */
128 
  db->cursor = newptr;
129 
  if (newptr->next) newptr->next->prev = newptr;
130 
  if (newptr->prev) newptr->prev->next = newptr;
131 
 
132 
  return(0);
1339 mateusz.vi 133 
}
134 
 
135 
 
1328 mateusz.vi 136 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 137 
 * returns non-zero on error */
1328 mateusz.vi 138 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 139 
  struct line far *l;
1275 mateusz.vi 140 
 
1339 mateusz.vi 141 
  l = line_calloc(slen);
1287 mateusz.vi 142 
  if (l == NULL) return(-1);
143 
 
1275 mateusz.vi 144 
  l->prev = db->cursor;
145 
  if (db->cursor) {
146 
    l->next = db->cursor->next;
147 
    db->cursor->next = l;
148 
    l->next->prev = l;
149 
  }
150 
  db->cursor = l;
1342 mateusz.vi 151 
  if (slen > 0) {
152 
    _fmemmove(l->payload, line, slen);
153 
    l->len = slen;
154 
  }
1287 mateusz.vi 155 
 
1328 mateusz.vi 156 
  db->totlines += 1;
157 
  db->curline += 1;
158 
 
1287 mateusz.vi 159 
  return(0);
1275 mateusz.vi 160 
}
161 
 
162 
 
1348 mateusz.vi 163 
static void ui_getstring(const char *query, char *s, unsigned short maxlen) {
164 
  unsigned short len = 0;
1544 mateusz.vi 165 
  unsigned char x;
1332 mateusz.vi 166 
  int k;
167 
 
168 
  if (maxlen == 0) return;
169 
  maxlen--; /* make room for the nul terminator */
170 
 
171 
  /* print query string */
1544 mateusz.vi 172 
  x = mdr_cout_str(screenlastrow, 0, query, SCHEME_STBAR3, 40);
173 
  mdr_cout_char_rep(screenlastrow, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 174 
 
175 
  for (;;) {
1544 mateusz.vi 176 
    mdr_cout_locate(screenlastrow, x + len);
1410 mateusz.vi 177 
    k = mdr_dos_getkey2();
1332 mateusz.vi 178 
 
1345 mateusz.vi 179 
    switch (k) {
180 
      case 0x1b: /* ESC */
181 
        s[0] = 0;
182 
        return;
183 
      case '\r':
184 
        s[len] = 0;
185 
        return;
186 
      case 0x08: /* BKSPC */
187 
        if (len > 0) {
188 
          len--;
1544 mateusz.vi 189 
          mdr_cout_char(screenlastrow, x + len, ' ', SCHEME_STBAR3);
1345 mateusz.vi 190 
        }
191 
        break;
192 
      default:
193 
        if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
1544 mateusz.vi 194 
          mdr_cout_char(screenlastrow, x + len, k, SCHEME_STBAR3);
1345 mateusz.vi 195 
          s[len++] = k;
196 
        }
1332 mateusz.vi 197 
    }
1345 mateusz.vi 198 
  }
1332 mateusz.vi 199 
 
200 
}
201 
 
202 
 
1324 mateusz.vi 203 
/* append a nul-terminated string to line at cursor position */
1550 mateusz.vi 204 
static int line_append(struct file *f, const char *buf, unsigned short len) {
1427 mateusz.vi 205 
  if (sizeof(struct line) + f->cursor->len + len < len) goto ERR; /* overflow check */
206 
  if (curline_resize(f, f->cursor->len + len) != 0) goto ERR;
207 
 
1337 mateusz.vi 208 
  _fmemmove(f->cursor->payload + f->cursor->len, buf, len);
1324 mateusz.vi 209 
  f->cursor->len += len;
210 
 
211 
  return(0);
1427 mateusz.vi 212 
  ERR:
213 
  return(-1);
1324 mateusz.vi 214 
}
215 
 
216 
 
1315 mateusz.vi 217 
static void db_rewind(struct file *db) {
1275 mateusz.vi 218 
  if (db->cursor == NULL) return;
219 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 220 
  db->curline = 0;
1275 mateusz.vi 221 
}
222 
 
223 
 
1541 mateusz.vi 224 
/* saves db file, resets db->modflag on success and overwrites the filename
225 
 * field if saveas is not NULL */
226 
static int savefile(struct file *db, const char *saveas) {
1539 mateusz.vi 227 
  int fd = 0;
228 
  const struct line far *l;
1556 mateusz.vi 229 
  unsigned short bytes;
1539 mateusz.vi 230 
  unsigned char eollen = 2;
231 
  const unsigned char *eolbuf = "\r\n";
232 
  int errflag = 0;
233 
 
234 
  /* if filename not overloaded then use the fname in db */
235 
  if (saveas == NULL) saveas = db->fname;
236 
 
237 
  _asm {
238 
    push ax
239 
    push cx
240 
    push dx
241 
 
242 
    mov ah, 0x3C    /* create or truncate file */
243 
    xor cx, cx      /* file attributes */
244 
    mov dx, saveas  /* works only in SMALL/TINY mode */
245 
    int 0x21
246 
    jnc DONE
247 
    mov errflag, ax
248 
    DONE:
249 
    mov fd, ax
250 
 
251 
    pop dx
252 
    pop cx
253 
    pop ax
254 
  }
255 
 
256 
  if (errflag != 0) return(-1);
257 
 
258 
  l = db->cursor;
259 
  while (l->prev) l = l->prev;
260 
 
261 
  /* preset line terminators */
262 
  if (db->lfonly) {
263 
    eolbuf++;
264 
    eollen--;
265 
  }
266 
 
267 
  while (l) {
268 
    /* do not write the last empty line, it is only useful for edition */
269 
    if (l->len != 0) {
1556 mateusz.vi 270 
      errflag |= mdr_dos_write(fd, l->payload, l->len, &bytes);
1539 mateusz.vi 271 
    } else if (l->next == NULL) {
272 
      break;
273 
    }
1556 mateusz.vi 274 
    errflag |= mdr_dos_write(fd, eolbuf, eollen, &bytes);
1539 mateusz.vi 275 
    l = l->next;
276 
  }
277 
 
1556 mateusz.vi 278 
  errflag |= mdr_dos_fclose(fd);
1539 mateusz.vi 279 
 
1541 mateusz.vi 280 
  /* did it all work? */
281 
  if (errflag == 0) {
282 
    db->modflag = 0;
283 
    if (saveas != db->fname) mdr_dos_truename(db->fname, saveas);
284 
  }
285 
 
1539 mateusz.vi 286 
  return(errflag);
287 
}
288 
 
289 
 
1549 mateusz.vi 290 
static void ui_statusbar(const struct file *db) {
1356 mateusz.vi 291 
  const char *s = svarlang_strid(0); /* ESC=MENU */
1348 mateusz.vi 292 
  unsigned short helpcol = screenw - strlen(s);
1440 mateusz.vi 293 
  unsigned short col;
1275 mateusz.vi 294 
 
1425 mateusz.vi 295 
  /* slot number (guaranteed to be 0-9) */
1355 mateusz.vi 296 
  {
297 
    char slot[4] = "#00";
1549 mateusz.vi 298 
    if (db->slotid == 9) {
1425 mateusz.vi 299 
      slot[1] = '1';
300 
    } else {
1549 mateusz.vi 301 
      slot[2] += db->slotid + 1;
1425 mateusz.vi 302 
    }
1427 mateusz.vi 303 
    mdr_cout_str(screenlastrow, 0, slot, SCHEME_STBAR2, 3);
1355 mateusz.vi 304 
  }
1313 mateusz.vi 305 
 
1355 mateusz.vi 306 
  /* fill rest of status bar with background */
1427 mateusz.vi 307 
  mdr_cout_char_rep(screenlastrow, 3, ' ', SCHEME_STBAR1, helpcol - 3);
1355 mateusz.vi 308 
 
1313 mateusz.vi 309 
  /* eol type */
1330 mateusz.vi 310 
  {
311 
    const char *eoltype = "CRLF";
1353 mateusz.vi 312 
    if (db->lfonly) eoltype += 2;
1440 mateusz.vi 313 
    mdr_cout_str(screenlastrow, helpcol - 5, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 314 
  }
1313 mateusz.vi 315 
 
1438 mateusz.vi 316 
  /* line numbers */
1436 mateusz.vi 317 
  {
1438 mateusz.vi 318 
    unsigned short x;
319 
    unsigned char count = 0;
1440 mateusz.vi 320 
    col = helpcol - 7;
1438 mateusz.vi 321 
 
1439 mateusz.vi 322 
    x = db->totlines;
1438 mateusz.vi 323 
    AGAIN:
1436 mateusz.vi 324 
    do {
1439 mateusz.vi 325 
      mdr_cout_char(screenlastrow, col--, '0' + (x % 10), SCHEME_STBAR1);
1436 mateusz.vi 326 
      x /= 10;
327 
    } while (x);
1438 mateusz.vi 328 
    /* redo same exercise, but printing the current line now */
329 
    if (count == 0) {
330 
      count = 1;
1439 mateusz.vi 331 
      mdr_cout_char(screenlastrow, col--, '/', SCHEME_STBAR1);
1438 mateusz.vi 332 
      x = 1 + db->curline;
333 
      goto AGAIN;
334 
    }
1440 mateusz.vi 335 
  }
1438 mateusz.vi 336 
 
1440 mateusz.vi 337 
  /* filename and modflag */
338 
  {
339 
    const char *fn;
340 
    unsigned short x;
341 
    unsigned short maxfnlen = col - 6;
342 
    if (db->fname[0] == 0) {
343 
      fn = svarlang_str(0, 1); /* "UNTITLED" */
344 
    } else {
345 
      /* display filename up to maxfnlen chars */
346 
      fn = db->fname;
347 
      x = strlen(fn);
348 
      if (x > maxfnlen) fn += x - maxfnlen;
349 
    }
350 
    x = mdr_cout_str(screenlastrow, 4, fn, SCHEME_STBAR1, maxfnlen);
351 
    if (db->modflag) mdr_cout_char(screenlastrow, 5 + x, '!', SCHEME_STBAR2);
1436 mateusz.vi 352 
  }
353 
 
1427 mateusz.vi 354 
  mdr_cout_str(screenlastrow, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 355 
}
356 
 
357 
 
1547 mateusz.vi 358 
static void ui_msg(unsigned short msgid1, unsigned short msgid2, unsigned short msgid3, unsigned char attr) {
359 
  unsigned short x, y, maxmsglen, i;
360 
  unsigned short msgcount = 1;
361 
  const char *msg[3];
1331 mateusz.vi 362 
 
1547 mateusz.vi 363 
  msg[0] = svarlang_strid(msgid1);
364 
 
365 
  if (msgid2 != 0) {
366 
    msgcount = 2;
367 
    msg[1] = svarlang_strid(msgid2);
1331 mateusz.vi 368 
  }
1547 mateusz.vi 369 
  if (msgid3 != 0) {
370 
    msgcount = 3;
371 
    msg[2] = svarlang_strid(msgid3);
372 
  }
1331 mateusz.vi 373 
 
1547 mateusz.vi 374 
  /* find longest msg */
375 
  maxmsglen = 0;
376 
  for (i = 0; i < msgcount; i++) {
377 
    y = strlen(msg[i]);
378 
    if (y > maxmsglen) maxmsglen = y;
379 
  }
380 
 
1331 mateusz.vi 381 
  y = (screenh - 6) >> 1;
1547 mateusz.vi 382 
  x = (screenw - maxmsglen - 3) >> 1;
383 
  for (i = y+1+msgcount; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, maxmsglen + 2);
1331 mateusz.vi 384 
  x++;
1345 mateusz.vi 385 
 
1547 mateusz.vi 386 
  for (i = 0; i < msgcount; i++) {
387 
    mdr_cout_str(y+1+i, x, msg[i], attr, maxmsglen);
388 
  }
1312 mateusz.vi 389 
 
1327 mateusz.vi 390 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 391 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 392 
}
393 
 
394 
 
1539 mateusz.vi 395 
/* returns 0 if operation may proceed, non-zero to cancel */
1541 mateusz.vi 396 
static unsigned char ui_confirm_if_unsaved(struct file *db) {
1539 mateusz.vi 397 
  int k;
398 
 
1342 mateusz.vi 399 
  if (db->modflag == 0) return(0);
400 
 
1355 mateusz.vi 401 
  mdr_cout_cursor_hide();
402 
 
1539 mateusz.vi 403 
  /* if file has been modified then ask for confirmation:
404 
   * ENTER        : agree to data loss
405 
   * SPACE        : SAVE file before quit (only if valid filename present)
406 
   * anything else: ABORT */
1547 mateusz.vi 407 
  ui_msg(4, 5, (db->fname[0])?9:8, SCHEME_MSG);
1342 mateusz.vi 408 
 
1539 mateusz.vi 409 
  k = mdr_dos_getkey2();
1355 mateusz.vi 410 
  mdr_cout_cursor_show();
411 
 
1539 mateusz.vi 412 
  /* ENTER = agree to loose unsaved data */
413 
  if (k == '\r') return(0);
414 
 
415 
  /* SPACE = save file and continue */
416 
  if ((k == ' ') && (db->fname[0] != 0) && (savefile(db, NULL) == 0)) return(0);
417 
 
418 
  /* any other key = cancel operation */
419 
  return(1);
1342 mateusz.vi 420 
}
421 
 
422 
 
1327 mateusz.vi 423 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 424 
  unsigned char x;
1310 mateusz.vi 425 
  const struct line far *l;
1316 mateusz.vi 426 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 427 
 
1392 mateusz.vi 428 
  /* quit early if nothing to refresh */
429 
  if (uidirty.from == 0xff) return;
430 
 
1288 mateusz.vi 431 
#ifdef DBG_REFRESH
1282 mateusz.vi 432 
  static char m = 'a';
433 
  m++;
434 
  if (m > 'z') m = 'a';
1288 mateusz.vi 435 
#endif
1282 mateusz.vi 436 
 
1310 mateusz.vi 437 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 438 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 439 
 
1310 mateusz.vi 440 
  /* iterate over lines and redraw whatever needs to be redrawn */
441 
  for (; l != NULL; l = l->next, y++) {
442 
 
443 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 444 
    if (y < uidirty.from) continue;
445 
    if (y > uidirty.to) break;
1282 mateusz.vi 446 
 
1318 mateusz.vi 447 
    x = 0;
1275 mateusz.vi 448 
    if (db->xoffset < l->len) {
1318 mateusz.vi 449 
      unsigned char i, limit;
450 
      if (l->len - db->xoffset < screenw) {
451 
        limit = l->len;
452 
      } else {
1427 mateusz.vi 453 
        limit = db->xoffset + screenlastcol;
1318 mateusz.vi 454 
      }
1333 mateusz.vi 455 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 456 
    }
1282 mateusz.vi 457 
 
1318 mateusz.vi 458 
    /* write empty spaces until end of line */
1427 mateusz.vi 459 
    if (x < screenlastcol) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenlastcol - x);
1318 mateusz.vi 460 
 
1288 mateusz.vi 461 
#ifdef DBG_REFRESH
1333 mateusz.vi 462 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 463 
#endif
1282 mateusz.vi 464 
 
1275 mateusz.vi 465 
    if (y == screenh - 2) break;
466 
  }
1310 mateusz.vi 467 
 
1319 mateusz.vi 468 
  /* fill all lines below if empty (and they need to be redrawn) */
469 
  if (l == NULL) {
1427 mateusz.vi 470 
    while ((y < screenlastrow) && (y < uidirty.to)) {
471 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenlastcol);
1319 mateusz.vi 472 
    }
1318 mateusz.vi 473 
  }
1328 mateusz.vi 474 
 
475 
  /* scroll bar */
1427 mateusz.vi 476 
  for (y = 0; y < screenlastrow; y++) {
477 
    mdr_cout_char(y, screenlastcol, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 478 
  }
479 
 
480 
  /* scroll cursor */
481 
  if (db->totlines >= screenh) {
482 
    unsigned short topline = db->curline - db->cursorposy;
483 
    unsigned short col;
484 
    unsigned short totlines = db->totlines - screenh + 1;
485 
    if (db->totlines - screenh > screenh) {
1427 mateusz.vi 486 
      col = topline / (totlines / screenlastrow);
1328 mateusz.vi 487 
    } else {
1427 mateusz.vi 488 
      col = topline * screenlastrow / totlines;
1328 mateusz.vi 489 
    }
1427 mateusz.vi 490 
    if (col >= screenlastrow) col = screenh - 2;
491 
    mdr_cout_char(col, screenlastcol, ' ', SCHEME_SCROLL);
1328 mateusz.vi 492 
  }
1392 mateusz.vi 493 
 
494 
  /* clear out the dirty flag */
495 
  uidirty.from = 0xff;
1275 mateusz.vi 496 
}
497 
 
498 
 
1327 mateusz.vi 499 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 500 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 501 
 
502 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 503 
    db->cursorposx = 0;
1275 mateusz.vi 504 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 505 
    uidirty.from = 0;
506 
    uidirty.to = 0xff;
1275 mateusz.vi 507 
  } else {
1316 mateusz.vi 508 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 509 
  }
510 
}
511 
 
512 
 
1327 mateusz.vi 513 
static void cursor_up(struct file *db) {
1422 mateusz.vi 514 
  if (db->cursor->prev == NULL) return;
515 
 
516 
  db->curline -= 1;
517 
  db->cursor = db->cursor->prev;
518 
  if (db->cursorposy == 0) {
519 
    uidirty.from = 0;
520 
    uidirty.to = 0xff;
521 
  } else {
522 
    db->cursorposy -= 1;
1275 mateusz.vi 523 
  }
524 
}
525 
 
526 
 
1327 mateusz.vi 527 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 528 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 529 
  if (db->xoffset > db->cursor->len) {
530 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 531 
    uidirty.from = 0;
532 
    uidirty.to = 0xff;
1282 mateusz.vi 533 
  }
534 
 
1427 mateusz.vi 535 
  if (db->xoffset + screenlastcol <= db->cursor->len) {
1282 mateusz.vi 536 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 537 
    uidirty.from = 0;
538 
    uidirty.to = 0xff;
1282 mateusz.vi 539 
  }
1316 mateusz.vi 540 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 541 
}
542 
 
543 
 
1327 mateusz.vi 544 
static void cursor_down(struct file *db) {
1422 mateusz.vi 545 
  if (db->cursor->next == NULL) return;
546 
 
547 
  db->curline += 1;
548 
  db->cursor = db->cursor->next;
549 
  if (db->cursorposy < screenh - 2) {
550 
    db->cursorposy += 1;
551 
  } else {
552 
    uidirty.from = 0;
553 
    uidirty.to = 0xff;
1276 mateusz.vi 554 
  }
555 
}
556 
 
557 
 
1327 mateusz.vi 558 
static void cursor_left(struct file *db) {
1316 mateusz.vi 559 
  if (db->cursorposx > 0) {
560 
    db->cursorposx -= 1;
1302 mateusz.vi 561 
  } else if (db->xoffset > 0) {
562 
    db->xoffset -= 1;
1327 mateusz.vi 563 
    uidirty.from = 0;
564 
    uidirty.to = 0xff;
1302 mateusz.vi 565 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 566 
    cursor_up(db);
567 
    cursor_eol(db);
1302 mateusz.vi 568 
  }
569 
}
570 
 
571 
 
1327 mateusz.vi 572 
static void cursor_home(struct file *db) {
1316 mateusz.vi 573 
  db->cursorposx = 0;
1282 mateusz.vi 574 
  if (db->xoffset != 0) {
575 
    db->xoffset = 0;
1327 mateusz.vi 576 
    uidirty.from = 0;
577 
    uidirty.to = 0xff;
1282 mateusz.vi 578 
  }
1276 mateusz.vi 579 
}
580 
 
581 
 
1327 mateusz.vi 582 
static void cursor_right(struct file *db) {
1316 mateusz.vi 583 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
584 
    if (db->cursorposx < screenw - 2) {
585 
      db->cursorposx += 1;
1308 mateusz.vi 586 
    } else {
587 
      db->xoffset += 1;
1327 mateusz.vi 588 
      uidirty.from = 0;
589 
      uidirty.to = 0xff;
1308 mateusz.vi 590 
    }
1357 mateusz.vi 591 
  } else if (db->cursor->next != NULL) { /* jump to start of next line */
1327 mateusz.vi 592 
    cursor_down(db);
593 
    cursor_home(db);
1308 mateusz.vi 594 
  }
595 
}
596 
 
597 
 
1327 mateusz.vi 598 
static void del(struct file *db) {
1316 mateusz.vi 599 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
600 
    _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 601 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 602 
    uidirty.from = db->cursorposy;
603 
    uidirty.to = db->cursorposy;
1393 mateusz.vi 604 
    db->modflag = 1;
1292 mateusz.vi 605 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
606 
    struct line far *nextline = db->cursor->next;
607 
    if (db->cursor->next->len > 0) {
1340 mateusz.vi 608 
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
1337 mateusz.vi 609 
        _fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 610 
        db->cursor->len += db->cursor->next->len;
611 
      }
612 
    }
1340 mateusz.vi 613 
 
1292 mateusz.vi 614 
    db->cursor->next = db->cursor->next->next;
615 
    db->cursor->next->prev = db->cursor;
1340 mateusz.vi 616 
 
1339 mateusz.vi 617 
    line_free(nextline);
1327 mateusz.vi 618 
    uidirty.from = db->cursorposy;
619 
    uidirty.to = 0xff;
1328 mateusz.vi 620 
    db->totlines -= 1;
1393 mateusz.vi 621 
    db->modflag = 1;
1292 mateusz.vi 622 
  }
623 
}
624 
 
625 
 
1327 mateusz.vi 626 
static void bkspc(struct file *db) {
1302 mateusz.vi 627 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1421 mateusz.vi 628 
  if ((db->cursorposx + db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 629 
 
1327 mateusz.vi 630 
  cursor_left(db);
631 
  del(db);
1302 mateusz.vi 632 
}
633 
 
634 
 
1450 mateusz.vi 635 
#define LOADFILE_FILENOTFOUND 2
636 
 
1346 mateusz.vi 637 
/* returns 0 on success, 1 on file not found, 2 on other error */
1449 mateusz.vi 638 
static unsigned char loadfile(struct file *db, const char *fname) {
1324 mateusz.vi 639 
  char *buffptr;
1556 mateusz.vi 640 
  unsigned short len, llen;
641 
  unsigned short fd;
1324 mateusz.vi 642 
  unsigned char eolfound;
1449 mateusz.vi 643 
  unsigned char err = 0;
1287 mateusz.vi 644 
 
1355 mateusz.vi 645 
  /* free the entire linked list of lines */
646 
  db_rewind(db);
647 
  while (db->cursor) {
648 
    struct line far *victim;
649 
    victim = db->cursor;
650 
    db->cursor = db->cursor->next;
651 
    line_free(victim);
652 
  }
1321 mateusz.vi 653 
 
1551 mateusz.vi 654 
  /* zero out the struct (take care to preserve the id of the slot, though) */
655 
  {
656 
    unsigned char slotid = db->slotid;
657 
    bzero(db, sizeof(struct file));
658 
    db->slotid = slotid;
659 
  }
1355 mateusz.vi 660 
 
1448 mateusz.vi 661 
  /* start by adding an empty line */
662 
  if (line_add(db, NULL, 0) != 0) return(2);
663 
 
1418 mateusz.vi 664 
  if (fname == NULL) goto SKIPLOADING;
1321 mateusz.vi 665 
 
1543 mateusz.vi 666 
  /* make the filename canonical (DOS 3+ only, on earlier versions it just copies the filename) */
667 
  mdr_dos_truename(db->fname, fname);
1355 mateusz.vi 668 
 
1559 mateusz.vi 669 
  /* fopen file */
670 
  fd = 0;
671 
  _asm {
672 
    push cx
673 
    push dx
674 
 
675 
    mov ax, 0x3d00
676 
    mov dx, fname   // works only in SMALL memory model!
677 
    xor cl, cl
678 
    int 0x21
679 
    mov fd, ax
680 
    jnc done
681 
    mov err, al
682 
    done:
683 
 
684 
    pop dx
685 
    pop cx
686 
  }
687 
 
1450 mateusz.vi 688 
  if (err != 0) goto SKIPLOADING;
1287 mateusz.vi 689 
 
1313 mateusz.vi 690 
  db->lfonly = 1;
691 
 
1324 mateusz.vi 692 
  for (eolfound = 0;;) {
693 
    unsigned short consumedbytes;
694 
 
1556 mateusz.vi 695 
    if ((mdr_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
1324 mateusz.vi 696 
    buffptr = buff;
697 
 
698 
    FINDLINE:
699 
 
1361 mateusz.vi 700 
    /* look for nearest \n (also expand tabs) */
1324 mateusz.vi 701 
    for (consumedbytes = 0;; consumedbytes++) {
1361 mateusz.vi 702 
 
703 
      if (buffptr[consumedbytes] == '\t') {
704 
        llen = consumedbytes;
705 
        break;
706 
      }
707 
 
1324 mateusz.vi 708 
      if (consumedbytes == len) {
709 
        llen = consumedbytes;
710 
        break;
1323 mateusz.vi 711 
      }
1324 mateusz.vi 712 
      if (buffptr[consumedbytes] == '\r') {
713 
        llen = consumedbytes;
714 
        consumedbytes++;
715 
        db->lfonly = 0;
1320 mateusz.vi 716 
        break;
717 
      }
1324 mateusz.vi 718 
      if (buffptr[consumedbytes] == '\n') {
719 
        eolfound = 1;
720 
        llen = consumedbytes;
721 
        consumedbytes++;
722 
        break;
723 
      }
1287 mateusz.vi 724 
    }
1324 mateusz.vi 725 
 
726 
    /* consumedbytes is the amount of bytes processed from buffptr,
727 
     * llen is the length of line's payload (without its line terminator) */
728 
 
729 
    /* append content, if line is non-empty */
730 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1339 mateusz.vi 731 
      goto IOERR;
1287 mateusz.vi 732 
    }
733 
 
1419 mateusz.vi 734 
    /* allocate the next line if current line ended */
1324 mateusz.vi 735 
    if (eolfound) {
1328 mateusz.vi 736 
      if (line_add(db, NULL, 0) != 0) {
1339 mateusz.vi 737 
        goto IOERR;
1324 mateusz.vi 738 
      }
739 
      eolfound = 0;
740 
    }
1287 mateusz.vi 741 
 
1361 mateusz.vi 742 
    /* append 8 spaces if tab char found */
1412 mateusz.vi 743 
    if ((consumedbytes < len) && (buffptr[consumedbytes] == '\t') && (glob_tablessmode == 0)) {
1361 mateusz.vi 744 
      consumedbytes++;
745 
      if (line_append(db, "        ", 8) != 0) {
746 
        goto IOERR;
747 
      }
748 
    }
749 
 
1324 mateusz.vi 750 
    /* anything left? process the buffer leftover again */
751 
    if (consumedbytes < len) {
752 
      len -= consumedbytes;
753 
      buffptr += consumedbytes;
754 
      goto FINDLINE;
755 
    }
756 
 
757 
  }
758 
 
1556 mateusz.vi 759 
  mdr_dos_fclose(fd);
1287 mateusz.vi 760 
 
1321 mateusz.vi 761 
  SKIPLOADING:
762 
 
1448 mateusz.vi 763 
  /* rewind cursor to top of file because it has been used by line_add() */
1339 mateusz.vi 764 
  db_rewind(db);
1320 mateusz.vi 765 
 
1448 mateusz.vi 766 
  return(err);
1339 mateusz.vi 767 
 
768 
  IOERR:
1556 mateusz.vi 769 
  mdr_dos_fclose(fd);
1450 mateusz.vi 770 
  return(1);
1287 mateusz.vi 771 
}
772 
 
773 
 
1356 mateusz.vi 774 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
775 
 * of argc and argv, saves some 330 bytes of binary size
776 
 * returns non-zero on error */
777 
static int parseargv(struct file *dbarr) {
778 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
779 
  unsigned short count = 0;
780 
  char *arg;
781 
  unsigned short lastarg = 0;
1449 mateusz.vi 782 
  unsigned char err;
1356 mateusz.vi 783 
 
784 
  while (!lastarg) {
785 
    /* jump to nearest arg */
786 
    while (*tail == ' ') {
787 
      *tail = 0;
788 
      tail++;
789 
    }
790 
 
791 
    if (*tail == '\r') {
792 
      *tail = 0;
793 
      break;
794 
    }
795 
 
796 
    arg = tail;
797 
 
798 
    /* jump to next delimiter */
799 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
800 
 
801 
    /* if \r then remember this is the last arg */
802 
    if (*tail == '\r') lastarg = 1;
803 
 
804 
    *tail = 0;
805 
    tail++;
806 
 
807 
    /* look at the arg now */
808 
    if (*arg == '/') {
1412 mateusz.vi 809 
      if (arg[1] == 't') { /* /t = do not expand tabs */
810 
        glob_tablessmode = 1;
811 
 
812 
      } else if (arg[1] == 'm') { /* /m = force mono mode */
813 
        glob_monomode = 1;
814 
 
815 
      } else {  /* help screen */
1419 mateusz.vi 816 
        mdr_coutraw_str(svarlang_str(1,3)); /* Sved, the SvarDOS editor */
1412 mateusz.vi 817 
        mdr_coutraw_str(" [");
1419 mateusz.vi 818 
        mdr_coutraw_str(svarlang_str(1,4)); /* ver */
1412 mateusz.vi 819 
        mdr_coutraw_puts(" " PVER "]");
820 
        mdr_coutraw_puts("Copyright (C) " PDATE " Mateusz Viste");
821 
        mdr_coutraw_crlf();
1433 mateusz.vi 822 
        mdr_coutraw_str("sved [/m] [/t] ");
1412 mateusz.vi 823 
        mdr_coutraw_puts(svarlang_str(1,1)); /* args syntax */
824 
        mdr_coutraw_crlf();
825 
        mdr_coutraw_puts(svarlang_str(1,10)); /* /m */
826 
        mdr_coutraw_puts(svarlang_str(1,11)); /* /t */
827 
        return(-1);
1387 mateusz.vi 828 
      }
1412 mateusz.vi 829 
      continue;
1356 mateusz.vi 830 
    }
831 
 
832 
    /* looks to be a filename */
833 
    if (count == 10) {
1420 mateusz.vi 834 
      mdr_coutraw_puts(svarlang_str(0,12)); /* too many files */
835 
      return(-1);
1356 mateusz.vi 836 
    }
837 
 
838 
    /* try loading it */
1387 mateusz.vi 839 
    mdr_coutraw_str(svarlang_str(1,2));
840 
    mdr_coutraw_char(' ');
1356 mateusz.vi 841 
    mdr_coutraw_puts(arg);
842 
    err = loadfile(&(dbarr[count]), arg);
843 
    if (err) {
1450 mateusz.vi 844 
      if (err == LOADFILE_FILENOTFOUND) { /* file not found */
1396 mateusz.vi 845 
        if ((count == 0) && (lastarg != 0)) { /* a 'file not found' is fine if only one file was given */
846 
          err = 0;
847 
        } else {
848 
          err = 11;
849 
        }
1356 mateusz.vi 850 
      } else { /* general error */
851 
        err = 10;
852 
      }
1396 mateusz.vi 853 
      if (err) {
854 
        mdr_coutraw_puts(svarlang_str(0,err));
855 
        return(-1);
856 
      }
1356 mateusz.vi 857 
    }
858 
    count++;
859 
  }
860 
 
861 
  return(0);
862 
}
863 
 
864 
 
1327 mateusz.vi 865 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1340 mateusz.vi 866 
  if (curline_resize(db, db->cursor->len + len) == 0) {
1317 mateusz.vi 867 
    unsigned short off = db->xoffset + db->cursorposx;
1393 mateusz.vi 868 
    db->modflag = 1;
1317 mateusz.vi 869 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
870 
    db->cursor->len += len;
1327 mateusz.vi 871 
    uidirty.from = db->cursorposy;
872 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 873 
    while (len--) {
874 
      db->cursor->payload[off++] = *databuf;
875 
      databuf++;
1327 mateusz.vi 876 
      cursor_right(db);
1317 mateusz.vi 877 
    }
878 
  }
879 
}
880 
 
881 
 
1343 mateusz.vi 882 
/* recompute db->curline by counting nodes in linked list */
883 
static void recompute_curline(struct file *db) {
884 
  const struct line far *l = db->cursor;
885 
 
886 
  db->curline = 0;
887 
  while (l->prev != NULL) {
888 
    db->curline += 1;
889 
    l = l->prev;
890 
  }
891 
}
892 
 
893 
 
1354 mateusz.vi 894 
enum MENU_ACTION {
1393 mateusz.vi 895 
  MENU_NONE   = 0,
896 
  MENU_OPEN   = 1,
897 
  MENU_SAVE   = 2,
898 
  MENU_SAVEAS = 3,
899 
  MENU_CLOSE  = 4,
900 
  MENU_CHGEOL = 5,
1418 mateusz.vi 901 
  MENU_QUIT   = 6
1354 mateusz.vi 902 
};
903 
 
904 
static enum MENU_ACTION ui_menu(void) {
905 
  unsigned short i, curchoice, attr, x, slen;
1393 mateusz.vi 906 
  unsigned short xorigin, yorigin;
1354 mateusz.vi 907 
 
908 
  /* find out the longest string */
909 
  slen = 0;
1355 mateusz.vi 910 
  for (i = MENU_OPEN; i <= MENU_QUIT; i++) {
1354 mateusz.vi 911 
    x = strlen(svarlang_str(8, i));
912 
    if (x > slen) slen = x;
913 
  }
914 
 
1393 mateusz.vi 915 
  /* calculate where to draw the menu on screen */
916 
  xorigin = (screenw - (slen + 5)) / 2;
1395 mateusz.vi 917 
  yorigin = (screenh - (MENU_QUIT - MENU_OPEN + 6)) / 2;
1393 mateusz.vi 918 
 
1395 mateusz.vi 919 
  /* */
920 
  uidirty.from = yorigin;
921 
  uidirty.to = 0xff;
922 
  uidirty.statusbar = 1;
923 
 
924 
  /* hide the cursor */
925 
  mdr_cout_cursor_hide();
926 
 
1355 mateusz.vi 927 
  curchoice = MENU_OPEN;
1354 mateusz.vi 928 
  for (;;) {
929 
    /* render menu */
1393 mateusz.vi 930 
    for (i = MENU_NONE; i <= MENU_QUIT + 1; i++) {
931 
      mdr_cout_char_rep(yorigin + i, xorigin, ' ', SCHEME_MENU, slen+4);
1354 mateusz.vi 932 
      if (i == curchoice) {
933 
        attr = SCHEME_MENU_CUR;
1415 mateusz.vi 934 
        mdr_cout_char_rep(yorigin + i, xorigin + 1, ' ', SCHEME_MENU_SEL, slen + 2);
1354 mateusz.vi 935 
      } else {
936 
        attr = SCHEME_MENU;
937 
      }
1416 mateusz.vi 938 
      mdr_cout_str(yorigin + i, xorigin + 2, svarlang_str(8, i), attr, slen);
1354 mateusz.vi 939 
    }
940 
    /* wait for key */
1410 mateusz.vi 941 
    switch (mdr_dos_getkey2()) {
1354 mateusz.vi 942 
      case 0x150: /* down */
943 
        if (curchoice == MENU_QUIT) {
1355 mateusz.vi 944 
          curchoice = MENU_OPEN;
1354 mateusz.vi 945 
        } else {
946 
          curchoice++;
947 
        }
948 
        break;
949 
      case 0x148: /* up */
1355 mateusz.vi 950 
        if (curchoice == MENU_OPEN) {
1354 mateusz.vi 951 
          curchoice = MENU_QUIT;
952 
        } else {
953 
          curchoice--;
954 
        }
955 
        break;
1395 mateusz.vi 956 
      default:
957 
        curchoice = MENU_NONE;
958 
        /* FALLTHRU */
959 
      case '\r': /* ENTER */
960 
        mdr_cout_cursor_show();
961 
        return(curchoice);
1354 mateusz.vi 962 
    }
963 
  }
964 
}
965 
 
966 
 
1549 mateusz.vi 967 
static struct file *select_slot(struct file *dbarr, unsigned short curfile) {
1355 mateusz.vi 968 
  uidirty.from = 0;
969 
  uidirty.to = 0xff;
970 
  uidirty.statusbar = 1;
971 
 
972 
  dbarr = &(dbarr[curfile]);
1549 mateusz.vi 973 
 
1415 mateusz.vi 974 
  /* force redraw now, because the main() routine might not if this is exit
975 
   * time and we want to show the user which file has unsaved changes */
1549 mateusz.vi 976 
  ui_statusbar(dbarr);
1355 mateusz.vi 977 
  ui_refresh(dbarr);
978 
  return(dbarr);
979 
}
980 
 
981 
 
1347 mateusz.vi 982 
/* main returns nothing, ie. sved always exits with a zero exit code
983 
 * (this saves 20 bytes of executable footprint) */
984 
void main(void) {
1355 mateusz.vi 985 
  static struct file dbarr[10];
986 
  struct file *db = dbarr; /* visible file is the first slot by default */
1548 mateusz.vi 987 
  static struct line far *clipboard;
1538 mateusz.vi 988 
  static unsigned char original_breakflag;
1275 mateusz.vi 989 
 
1418 mateusz.vi 990 
  { /* load NLS resource */
1364 mateusz.vi 991 
    unsigned short i = 0;
992 
    const char far *selfptr;
1548 mateusz.vi 993 
    char lang[8];
1364 mateusz.vi 994 
    selfptr = mdr_dos_selfexe();
995 
    if (selfptr != NULL) {
996 
      do {
1548 mateusz.vi 997 
        buff[i] = selfptr[i];
998 
      } while (buff[i++] != 0);
999 
      svarlang_autoload_exepath(buff, mdr_dos_getenv(lang, "LANG", sizeof(lang)));
1364 mateusz.vi 1000 
    }
1307 mateusz.vi 1001 
  }
1282 mateusz.vi 1002 
 
1355 mateusz.vi 1003 
  /* preload all slots with empty files */
1549 mateusz.vi 1004 
  {
1005 
    unsigned short i;
1006 
    for (i = 0; i < 10; i++) {
1007 
      loadfile(&(dbarr[i]), NULL);
1008 
      dbarr[i].slotid = i;
1009 
    }
1355 mateusz.vi 1010 
  }
1011 
 
1356 mateusz.vi 1012 
  /* parse argv (and load files, if any passed on) */
1013 
  if (parseargv(dbarr) != 0) return;
1282 mateusz.vi 1014 
 
1412 mateusz.vi 1015 
  if ((mdr_cout_init(&screenw, &screenh) != 0) && (glob_monomode == 0)) {
1333 mateusz.vi 1016 
    /* load color scheme if mdr_cout_init returns a color flag */
1017 
    SCHEME_TEXT = 0x17;
1354 mateusz.vi 1018 
    SCHEME_MENU = 0x70;
1388 mateusz.vi 1019 
    SCHEME_MENU_CUR = 0x6f;
1020 
    SCHEME_MENU_SEL = 0x66;
1333 mateusz.vi 1021 
    SCHEME_STBAR1 = 0x70;
1022 
    SCHEME_STBAR2 = 0x78;
1392 mateusz.vi 1023 
    SCHEME_STBAR3 = 0x3f;
1333 mateusz.vi 1024 
    SCHEME_SCROLL = 0x70;
1388 mateusz.vi 1025 
    SCHEME_MSG = 0x6f;
1333 mateusz.vi 1026 
    SCHEME_ERR = 0x4f;
1027 
  }
1427 mateusz.vi 1028 
  screenlastrow = screenh - 1;
1029 
  screenlastcol = screenw - 1;
1275 mateusz.vi 1030 
 
1414 mateusz.vi 1031 
  /* instruct DOS to stop detecting CTRL+C because user needs it for
1032 
   * copy/paste operations. also remember the original status of the BREAK
1033 
   * flag so I can restore it as it was before quitting. */
1034 
  original_breakflag = mdr_dos_ctrlc_disable();
1410 mateusz.vi 1035 
 
1275 mateusz.vi 1036 
  for (;;) {
1037 
    int k;
1038 
 
1362 mateusz.vi 1039 
    /* add an extra empty line if cursor is on last line and this line is not empty */
1040 
    if ((db->cursor->next == NULL) && (db->cursor->len != 0)) {
1041 
      if (line_add(db, NULL, 0) == 0) {
1042 
        db->cursor = db->cursor->prev; /* line_add() changes the cursor pointer */
1437 mateusz.vi 1043 
        db->curline -= 1;
1362 mateusz.vi 1044 
      }
1045 
    }
1046 
 
1327 mateusz.vi 1047 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 1048 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 1049 
 
1392 mateusz.vi 1050 
    ui_refresh(db);
1051 
 
1436 mateusz.vi 1052 
    if ((uidirty.statusbar != 0) || (db->modflagprev != db->modflag) || (db->curline_prev != db->curline)) {
1549 mateusz.vi 1053 
      ui_statusbar(db);
1342 mateusz.vi 1054 
      uidirty.statusbar = 0;
1355 mateusz.vi 1055 
      db->modflagprev = db->modflag;
1436 mateusz.vi 1056 
      db->curline_prev = db->curline;
1342 mateusz.vi 1057 
    }
1328 mateusz.vi 1058 
#ifdef DBG_LINENUM
1059 
      {
1060 
        char ddd[10];
1061 
        db->curline += 1;
1062 
        ddd[0] = '0' + db->curline / 100;
1063 
        ddd[1] = '0' + (db->curline % 100) / 10;
1064 
        ddd[2] = '0' + (db->curline % 10);
1065 
        db->curline -= 1;
1066 
        ddd[3] = '/';
1067 
        ddd[4] = '0' + db->totlines / 100;
1068 
        ddd[5] = '0' + (db->totlines % 100) / 10;
1069 
        ddd[6] = '0' + (db->totlines % 10);
1070 
        ddd[7] = 0;
1333 mateusz.vi 1071 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 1072 
      }
1073 
#endif
1275 mateusz.vi 1074 
 
1410 mateusz.vi 1075 
    k = mdr_dos_getkey2();
1282 mateusz.vi 1076 
 
1275 mateusz.vi 1077 
    if (k == 0x150) { /* down */
1327 mateusz.vi 1078 
      cursor_down(db);
1275 mateusz.vi 1079 
 
1080 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 1081 
      cursor_up(db);
1275 mateusz.vi 1082 
 
1083 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 1084 
      cursor_right(db);
1275 mateusz.vi 1085 
 
1086 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 1087 
      cursor_left(db);
1275 mateusz.vi 1088 
 
1282 mateusz.vi 1089 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 1090 
      unsigned char dist = db->cursorposy + screenh - 1;
1091 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
1092 
        db->cursor = db->cursor->prev;
1093 
        dist--;
1094 
      }
1095 
      if (dist != 0) {
1096 
        db->cursorposy = 0;
1097 
        db->cursorposx = 0;
1098 
      } else {
1099 
        dist = db->cursorposy;
1100 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
1101 
      }
1102 
      uidirty.from = 0;
1103 
      uidirty.to = 0xff;
1343 mateusz.vi 1104 
      recompute_curline(db);
1282 mateusz.vi 1105 
 
1106 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 1107 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
1108 
      while ((dist != 0) && (db->cursor->next != NULL)) {
1109 
        db->cursor = db->cursor->next;
1110 
        dist--;
1111 
      }
1112 
      if (dist != 0) {
1113 
        db->cursorposy = screenh - 2;
1114 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
1115 
        db->cursorposx = 0;
1116 
      } else {
1117 
        dist = screenh - 2 - db->cursorposy;
1118 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
1119 
      }
1120 
      uidirty.from = 0;
1121 
      uidirty.to = 0xff;
1343 mateusz.vi 1122 
      recompute_curline(db);
1282 mateusz.vi 1123 
 
1124 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 1125 
       cursor_home(db);
1282 mateusz.vi 1126 
 
1127 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 1128 
       cursor_eol(db);
1282 mateusz.vi 1129 
 
1275 mateusz.vi 1130 
    } else if (k == 0x1B) { /* ESC */
1354 mateusz.vi 1131 
      int quitnow = 0;
1394 mateusz.vi 1132 
      char fname[64];
1354 mateusz.vi 1133 
      int saveflag = 0;
1393 mateusz.vi 1134 
      enum MENU_ACTION ui_action;
1275 mateusz.vi 1135 
 
1392 mateusz.vi 1136 
      /* collect the exact menu action and clear the screen */
1137 
      ui_action = ui_menu();
1138 
      ui_refresh(db);
1354 mateusz.vi 1139 
 
1392 mateusz.vi 1140 
      switch (ui_action) {
1141 
 
1354 mateusz.vi 1142 
        case MENU_NONE:
1143 
          break;
1144 
 
1145 
        case MENU_OPEN:
1146 
          /* display a warning if unsaved changes are pending */
1547 mateusz.vi 1147 
          if (db->modflag != 0) ui_msg(4, 8, 0, SCHEME_MSG);
1354 mateusz.vi 1148 
 
1149 
          /* ask for filename */
1150 
          ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
1151 
          if (fname[0] != 0) {
1449 mateusz.vi 1152 
            unsigned char err;
1354 mateusz.vi 1153 
            err = loadfile(db, fname);
1154 
            if (err != 0) {
1450 mateusz.vi 1155 
              if (err == LOADFILE_FILENOTFOUND) {
1547 mateusz.vi 1156 
                ui_msg(11, 0, 0, SCHEME_ERR); /* file not found */
1354 mateusz.vi 1157 
              } else {
1547 mateusz.vi 1158 
                ui_msg(10, 0, 0, SCHEME_ERR);  /* ERROR */
1354 mateusz.vi 1159 
              }
1160 
              mdr_bios_tickswait(44); /* 3s */
1418 mateusz.vi 1161 
              loadfile(db, NULL);
1354 mateusz.vi 1162 
            }
1163 
          }
1393 mateusz.vi 1164 
          uidirty.from = 0;
1165 
          uidirty.to = 0xff;
1166 
          uidirty.statusbar = 1;
1354 mateusz.vi 1167 
          break;
1168 
 
1169 
        case MENU_SAVEAS:
1170 
          saveflag = 1;
1171 
          /* FALLTHRU */
1172 
        case MENU_SAVE:
1173 
          if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
1174 
            ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
1175 
            if (*fname == 0) break;
1176 
            saveflag = savefile(db, fname);
1177 
          } else {
1178 
            saveflag = savefile(db, NULL);
1179 
          }
1180 
 
1395 mateusz.vi 1181 
          mdr_cout_cursor_hide();
1182 
 
1354 mateusz.vi 1183 
          if (saveflag == 0) {
1547 mateusz.vi 1184 
            ui_msg(2, 0, 0, SCHEME_MSG);
1354 mateusz.vi 1185 
            mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
1186 
          } else {
1547 mateusz.vi 1187 
            ui_msg(10, 0, 0, SCHEME_ERR);
1354 mateusz.vi 1188 
            mdr_bios_tickswait(36); /* 2s */
1189 
          }
1395 mateusz.vi 1190 
          mdr_cout_cursor_show();
1354 mateusz.vi 1191 
          break;
1192 
 
1355 mateusz.vi 1193 
        case MENU_CLOSE:
1194 
          if (ui_confirm_if_unsaved(db) == 0) {
1418 mateusz.vi 1195 
            loadfile(db, NULL);
1355 mateusz.vi 1196 
          }
1197 
          uidirty.from = 0;
1198 
          uidirty.to = 0xff;
1199 
          uidirty.statusbar = 1;
1200 
          break;
1201 
 
1354 mateusz.vi 1202 
        case MENU_CHGEOL:
1393 mateusz.vi 1203 
          db->modflag = 1;
1354 mateusz.vi 1204 
          db->lfonly ^= 1;
1205 
          break;
1206 
 
1207 
        case MENU_QUIT:
1355 mateusz.vi 1208 
          quitnow = 1;
1549 mateusz.vi 1209 
          {
1210 
            unsigned short curfile;
1211 
            for (curfile = 0; curfile < 10; curfile++) {
1212 
              if (dbarr[curfile].modflag == 0) continue; /* skip unmodified slots */
1355 mateusz.vi 1213 
              db = select_slot(dbarr, curfile);
1441 mateusz.vi 1214 
              if (ui_confirm_if_unsaved(db) != 0) {
1215 
                quitnow = 0;
1216 
                break;
1217 
              }
1355 mateusz.vi 1218 
            }
1219 
          }
1354 mateusz.vi 1220 
          break;
1221 
      }
1222 
 
1223 
      if (quitnow) break;
1224 
 
1289 mateusz.vi 1225 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 1226 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 1227 
      /* add a new line */
1328 mateusz.vi 1228 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1393 mateusz.vi 1229 
        db->modflag = 1;
1328 mateusz.vi 1230 
        db->cursor = db->cursor->prev; /* back to original line */
1427 mateusz.vi 1231 
        db->curline -= 1;
1289 mateusz.vi 1232 
        /* trim the line above */
1328 mateusz.vi 1233 
        db->cursor->len = off;
1289 mateusz.vi 1234 
        /* move cursor to the (new) line below */
1328 mateusz.vi 1235 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 1236 
        uidirty.to = 0xff;
1328 mateusz.vi 1237 
        cursor_down(db);
1238 
        cursor_home(db);
1289 mateusz.vi 1239 
      } else {
1240 
        /* ERROR: OUT OF MEMORY */
1241 
      }
1242 
 
1292 mateusz.vi 1243 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 1244 
      del(db);
1292 mateusz.vi 1245 
 
1302 mateusz.vi 1246 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 1247 
      bkspc(db);
1302 mateusz.vi 1248 
 
1308 mateusz.vi 1249 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 1250 
      char c = k;
1327 mateusz.vi 1251 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 1252 
 
1317 mateusz.vi 1253 
    } else if (k == 0x009) { /* TAB */
1412 mateusz.vi 1254 
      if (glob_tablessmode == 0) {
1255 
        insert_in_line(db, "        ", 8);
1256 
      } else {
1257 
        insert_in_line(db, "\t", 1);
1258 
      }
1317 mateusz.vi 1259 
 
1355 mateusz.vi 1260 
    } else if ((k >= 0x13b) && (k <= 0x144)) { /* F1..F10 */
1549 mateusz.vi 1261 
      db = select_slot(dbarr, k - 0x13b);
1309 mateusz.vi 1262 
 
1325 mateusz.vi 1263 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
1264 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
1265 
      for (;;) {
1266 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
1267 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 1268 
        cursor_right(db);
1325 mateusz.vi 1269 
      }
1270 
      /* now skip to next non-space or end of file */
1271 
      for (;;) {
1327 mateusz.vi 1272 
        cursor_right(db);
1325 mateusz.vi 1273 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1274 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
1275 
      }
1276 
 
1277 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 1278 
      cursor_left(db);
1325 mateusz.vi 1279 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
1280 
      for (;;) {
1281 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
1282 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 1283 
        cursor_left(db);
1325 mateusz.vi 1284 
      }
1285 
      /* now skip to next space or start of file */
1286 
      for (;;) {
1327 mateusz.vi 1287 
        cursor_left(db);
1325 mateusz.vi 1288 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 1289 
          cursor_right(db);
1325 mateusz.vi 1290 
          break;
1291 
        }
1292 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
1293 
      }
1294 
 
1410 mateusz.vi 1295 
    } else if ((k == 0x003) || (k == 0x018)) { /* CTRL+C or CTRL+X */
1296 
      /* free clipboard if anything in it */
1297 
      if (clipboard != NULL) line_free(clipboard);
1298 
 
1299 
      /* copy cursor line to clipboard */
1300 
      clipboard = line_calloc(db->cursor->len);
1301 
      if (clipboard == NULL) {
1547 mateusz.vi 1302 
        ui_msg(10, 0, 0, SCHEME_ERR); /* ERROR */
1410 mateusz.vi 1303 
        mdr_bios_tickswait(18); /* 1s */
1304 
      } else {
1427 mateusz.vi 1305 
        mdr_cout_char_rep(db->cursorposy, 0, ' ', ((SCHEME_TEXT >> 4) | (SCHEME_TEXT << 4)) & 0xff, screenlastcol);
1410 mateusz.vi 1306 
        uidirty.from = db->cursorposy;
1307 
        uidirty.to = db->cursorposy;
1308 
        if (db->cursor->len != 0) {
1309 
          _fmemmove(clipboard->payload, db->cursor->payload, db->cursor->len);
1310 
          clipboard->len = db->cursor->len;
1311 
        }
1312 
        mdr_bios_tickswait(2); /* ca 100ms */
1313 
 
1314 
        /* if this is about cutting the line (CTRL+X) then delete cur line */
1315 
        if ((k == 0x018) && ((db->cursor->next != NULL) || (db->cursor->prev != NULL))) {
1316 
          if (db->cursor->next) db->cursor->next->prev = db->cursor->prev;
1317 
          if (db->cursor->prev) db->cursor->prev->next = db->cursor->next;
1318 
          clipboard->prev = db->cursor;
1319 
          if (db->cursor->next) {
1320 
            db->cursor = db->cursor->next;
1321 
          } else {
1322 
            cursor_up(db);
1323 
          }
1324 
          line_free(clipboard->prev);
1423 mateusz.vi 1325 
          db->totlines -= 1;
1552 mateusz.vi 1326 
          db->modflag = 1;
1410 mateusz.vi 1327 
          uidirty.from = 0;
1328 
          uidirty.to = 0xff;
1412 mateusz.vi 1329 
          recompute_curline(db);
1410 mateusz.vi 1330 
        }
1331 
      }
1332 
 
1420 mateusz.vi 1333 
    } else if ((k == 0x016) && (clipboard != NULL)) { /* CTRL+V */
1334 
      if (line_add(db, clipboard->payload, clipboard->len) != 0) {
1547 mateusz.vi 1335 
        ui_msg(10, 0, 0, SCHEME_ERR); /* ERROR */
1420 mateusz.vi 1336 
        mdr_bios_tickswait(18); /* 1s */
1337 
      } else {
1338 
        /* rewire the linked list so the new line is on top of the previous one */
1339 
        clipboard->prev = db->cursor->prev;
1340 
        /* remove prev node from list */
1341 
        db->cursor->prev = db->cursor->prev->prev;
1342 
        if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor;
1343 
        /* insert the node after cursor now */
1344 
        clipboard->prev->next = db->cursor->next;
1345 
        if (db->cursor->next != NULL) db->cursor->next->prev = clipboard->prev;
1346 
        clipboard->prev->prev = db->cursor;
1347 
        db->cursor->next = clipboard->prev;
1348 
        cursor_down(db);
1552 mateusz.vi 1349 
        db->modflag = 1;
1410 mateusz.vi 1350 
      }
1351 
      uidirty.from = 0;
1352 
      uidirty.to = 0xff;
1412 mateusz.vi 1353 
      recompute_curline(db);
1410 mateusz.vi 1354 
 
1333 mateusz.vi 1355 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 1356 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
1357 
      char buff[4];
1358 
      const char *HEX = "0123456789ABCDEF";
1359 
      buff[0] = HEX[(k >> 8) & 15];
1360 
      buff[1] = HEX[(k >> 4) & 15];
1361 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 1362 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
1363 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1410 mateusz.vi 1364 
      mdr_dos_getkey2();
1275 mateusz.vi 1365 
      break;
1333 mateusz.vi 1366 
#endif
1275 mateusz.vi 1367 
    }
1368 
  }
1369 
 
1370 
  mdr_cout_close();
1371 
 
1414 mateusz.vi 1372 
  /* restore the DOS BREAK flag if it was originally set */
1373 
  if (original_breakflag != 0) mdr_dos_ctrlc_enable();
1374 
 
1320 mateusz.vi 1375 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 1376 
 
1347 mateusz.vi 1377 
  return;
1275 mateusz.vi 1378 
}