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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 
 
1338 mateusz.vi 26 
#include <dos.h>      /* _dos_open(), _dos_read(), _dos_close(), ... */
27 
#include <fcntl.h>    /* O_RDONLY, O_WRONLY */
1275 mateusz.vi 28 
#include <string.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 
 
1356 mateusz.vi 37 
#define PVER "2023.0"
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 
 
1327 mateusz.vi 59 
static struct {
60 
    unsigned char from;
61 
    unsigned char to;
1342 mateusz.vi 62 
    unsigned char statusbar;
63 
} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */
1327 mateusz.vi 64 
 
1275 mateusz.vi 65 
#define SCROLL_CURSOR 0xB1
66 
 
67 
struct line {
1430 mateusz.vi 68 
  unsigned short len;
69 
  struct line far *next;
1288 mateusz.vi 70 
  struct line far *prev;
1275 mateusz.vi 71 
  char payload[1];
72 
};
73 
 
1315 mateusz.vi 74 
struct file {
1288 mateusz.vi 75 
  struct line far *cursor;
1275 mateusz.vi 76 
  unsigned short xoffset;
1348 mateusz.vi 77 
  unsigned short cursorposx;
78 
  unsigned short cursorposy;
1328 mateusz.vi 79 
  unsigned short totlines;
80 
  unsigned short curline;
1436 mateusz.vi 81 
  unsigned short curline_prev;
1330 mateusz.vi 82 
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
83 
  char modflag;  /* non-zero if file has been modified since last save */
1355 mateusz.vi 84 
  char modflagprev;
1332 mateusz.vi 85 
  char fname[128];
1275 mateusz.vi 86 
};
87 
 
88 
 
1326 mateusz.vi 89 
/*****************************************************************************
90 
 * functions                                                                 *
91 
 *****************************************************************************/
92 
 
1339 mateusz.vi 93 
static struct line far *line_calloc(unsigned short siz) {
1342 mateusz.vi 94 
  struct line far *res;
1339 mateusz.vi 95 
  unsigned int seg;
1341 mateusz.vi 96 
  if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);
1342 mateusz.vi 97 
  res = MK_FP(seg, 0);
98 
  _fmemset(res, 0, sizeof(struct line) + siz);
1339 mateusz.vi 99 
  return(MK_FP(seg, 0));
100 
}
101 
 
102 
 
103 
static void line_free(struct line far *ptr) {
104 
  _dos_freemem(FP_SEG(ptr));
105 
}
106 
 
107 
 
1348 mateusz.vi 108 
static int curline_resize(struct file far *db, unsigned short newsiz) {
1339 mateusz.vi 109 
  unsigned int maxavail;
110 
  struct line far *newptr;
111 
 
1341 mateusz.vi 112 
  /* try resizing the block (much faster) */
113 
  if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);
1339 mateusz.vi 114 
 
115 
  /* create a new block and copy data over */
116 
  newptr = line_calloc(newsiz);
1340 mateusz.vi 117 
  if (newptr == NULL) return(-1);
118 
  _fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
119 
 
120 
  /* rewire the linked list */
121 
  db->cursor = newptr;
122 
  if (newptr->next) newptr->next->prev = newptr;
123 
  if (newptr->prev) newptr->prev->next = newptr;
124 
 
125 
  return(0);
1339 mateusz.vi 126 
}
127 
 
128 
 
1328 mateusz.vi 129 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 130 
 * returns non-zero on error */
1328 mateusz.vi 131 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 132 
  struct line far *l;
1275 mateusz.vi 133 
 
1339 mateusz.vi 134 
  l = line_calloc(slen);
1287 mateusz.vi 135 
  if (l == NULL) return(-1);
136 
 
1275 mateusz.vi 137 
  l->prev = db->cursor;
138 
  if (db->cursor) {
139 
    l->next = db->cursor->next;
140 
    db->cursor->next = l;
141 
    l->next->prev = l;
142 
  }
143 
  db->cursor = l;
1342 mateusz.vi 144 
  if (slen > 0) {
145 
    _fmemmove(l->payload, line, slen);
146 
    l->len = slen;
147 
  }
1287 mateusz.vi 148 
 
1328 mateusz.vi 149 
  db->totlines += 1;
150 
  db->curline += 1;
151 
 
1287 mateusz.vi 152 
  return(0);
1275 mateusz.vi 153 
}
154 
 
155 
 
1348 mateusz.vi 156 
static void ui_getstring(const char *query, char *s, unsigned short maxlen) {
157 
  unsigned short len = 0;
158 
  unsigned char y, x;
1332 mateusz.vi 159 
  int k;
160 
 
161 
  if (maxlen == 0) return;
162 
  maxlen--; /* make room for the nul terminator */
163 
 
1427 mateusz.vi 164 
  y = screenlastrow;
1332 mateusz.vi 165 
 
166 
  /* print query string */
1333 mateusz.vi 167 
  x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);
168 
  mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 169 
 
170 
  for (;;) {
171 
    mdr_cout_locate(y, x + len);
1410 mateusz.vi 172 
    k = mdr_dos_getkey2();
1332 mateusz.vi 173 
 
1345 mateusz.vi 174 
    switch (k) {
175 
      case 0x1b: /* ESC */
176 
        s[0] = 0;
177 
        return;
178 
      case '\r':
179 
        s[len] = 0;
180 
        return;
181 
      case 0x08: /* BKSPC */
182 
        if (len > 0) {
183 
          len--;
184 
          mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);
185 
        }
186 
        break;
187 
      default:
188 
        if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
189 
          mdr_cout_char(y, x + len, k, SCHEME_STBAR3);
190 
          s[len++] = k;
191 
        }
1332 mateusz.vi 192 
    }
1345 mateusz.vi 193 
  }
1332 mateusz.vi 194 
 
195 
}
196 
 
197 
 
1324 mateusz.vi 198 
/* append a nul-terminated string to line at cursor position */
199 
static int line_append(struct file *f, const char far *buf, unsigned short len) {
1427 mateusz.vi 200 
  if (sizeof(struct line) + f->cursor->len + len < len) goto ERR; /* overflow check */
201 
  if (curline_resize(f, f->cursor->len + len) != 0) goto ERR;
202 
 
1337 mateusz.vi 203 
  _fmemmove(f->cursor->payload + f->cursor->len, buf, len);
1324 mateusz.vi 204 
  f->cursor->len += len;
205 
 
206 
  return(0);
1427 mateusz.vi 207 
  ERR:
208 
  return(-1);
1324 mateusz.vi 209 
}
210 
 
211 
 
1315 mateusz.vi 212 
static void db_rewind(struct file *db) {
1275 mateusz.vi 213 
  if (db->cursor == NULL) return;
214 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 215 
  db->curline = 0;
1275 mateusz.vi 216 
}
217 
 
218 
 
1435 mateusz.vi 219 
static void ui_statusbar(const struct file *db, unsigned char slotnum) {
1356 mateusz.vi 220 
  const char *s = svarlang_strid(0); /* ESC=MENU */
1348 mateusz.vi 221 
  unsigned short helpcol = screenw - strlen(s);
1440 mateusz.vi 222 
  unsigned short col;
1275 mateusz.vi 223 
 
1425 mateusz.vi 224 
  /* slot number (guaranteed to be 0-9) */
1355 mateusz.vi 225 
  {
226 
    char slot[4] = "#00";
1425 mateusz.vi 227 
    if (slotnum == 9) {
228 
      slot[1] = '1';
229 
    } else {
230 
      slotnum++;
231 
      slot[2] += slotnum;
232 
    }
1427 mateusz.vi 233 
    mdr_cout_str(screenlastrow, 0, slot, SCHEME_STBAR2, 3);
1355 mateusz.vi 234 
  }
1313 mateusz.vi 235 
 
1355 mateusz.vi 236 
  /* fill rest of status bar with background */
1427 mateusz.vi 237 
  mdr_cout_char_rep(screenlastrow, 3, ' ', SCHEME_STBAR1, helpcol - 3);
1355 mateusz.vi 238 
 
1313 mateusz.vi 239 
  /* eol type */
1330 mateusz.vi 240 
  {
241 
    const char *eoltype = "CRLF";
1353 mateusz.vi 242 
    if (db->lfonly) eoltype += 2;
1440 mateusz.vi 243 
    mdr_cout_str(screenlastrow, helpcol - 5, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 244 
  }
1313 mateusz.vi 245 
 
1438 mateusz.vi 246 
  /* line numbers */
1436 mateusz.vi 247 
  {
1438 mateusz.vi 248 
    unsigned short x;
249 
    unsigned char count = 0;
1440 mateusz.vi 250 
    col = helpcol - 7;
1438 mateusz.vi 251 
 
1439 mateusz.vi 252 
    x = db->totlines;
1438 mateusz.vi 253 
    AGAIN:
1436 mateusz.vi 254 
    do {
1439 mateusz.vi 255 
      mdr_cout_char(screenlastrow, col--, '0' + (x % 10), SCHEME_STBAR1);
1436 mateusz.vi 256 
      x /= 10;
257 
    } while (x);
1438 mateusz.vi 258 
    /* redo same exercise, but printing the current line now */
259 
    if (count == 0) {
260 
      count = 1;
1439 mateusz.vi 261 
      mdr_cout_char(screenlastrow, col--, '/', SCHEME_STBAR1);
1438 mateusz.vi 262 
      x = 1 + db->curline;
263 
      goto AGAIN;
264 
    }
1440 mateusz.vi 265 
  }
1438 mateusz.vi 266 
 
1440 mateusz.vi 267 
  /* filename and modflag */
268 
  {
269 
    const char *fn;
270 
    unsigned short x;
271 
    unsigned short maxfnlen = col - 6;
272 
    if (db->fname[0] == 0) {
273 
      fn = svarlang_str(0, 1); /* "UNTITLED" */
274 
    } else {
275 
      /* display filename up to maxfnlen chars */
276 
      fn = db->fname;
277 
      x = strlen(fn);
278 
      if (x > maxfnlen) fn += x - maxfnlen;
279 
    }
280 
    x = mdr_cout_str(screenlastrow, 4, fn, SCHEME_STBAR1, maxfnlen);
281 
    if (db->modflag) mdr_cout_char(screenlastrow, 5 + x, '!', SCHEME_STBAR2);
1436 mateusz.vi 282 
  }
283 
 
1427 mateusz.vi 284 
  mdr_cout_str(screenlastrow, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 285 
}
286 
 
287 
 
1331 mateusz.vi 288 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
1312 mateusz.vi 289 
  unsigned short x, y, msglen, i;
1428 mateusz.vi 290 
  unsigned short msg2flag = 0;
1331 mateusz.vi 291 
 
292 
  msglen = strlen(msg1);
293 
  if (msg2) {
294 
    msg2flag = 1;
295 
    i = strlen(msg2);
296 
    if (i > msglen) msglen = i;
297 
  }
298 
 
299 
  y = (screenh - 6) >> 1;
1312 mateusz.vi 300 
  x = (screenw - msglen - 4) >> 1;
1331 mateusz.vi 301 
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
302 
  x++;
1345 mateusz.vi 303 
 
1331 mateusz.vi 304 
  mdr_cout_str(y+1, x, msg1, attr, msglen);
305 
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
1312 mateusz.vi 306 
 
1327 mateusz.vi 307 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 308 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 309 
}
310 
 
311 
 
1412 mateusz.vi 312 
static unsigned char ui_confirm_if_unsaved(const struct file *db) {
1355 mateusz.vi 313 
  unsigned char r = 0;
1342 mateusz.vi 314 
  if (db->modflag == 0) return(0);
315 
 
1355 mateusz.vi 316 
  mdr_cout_cursor_hide();
317 
 
1342 mateusz.vi 318 
  /* if file has been modified then ask for confirmation */
319 
  ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);
1410 mateusz.vi 320 
  if (mdr_dos_getkey2() != '\r') r = 1;
1342 mateusz.vi 321 
 
1355 mateusz.vi 322 
  mdr_cout_cursor_show();
323 
 
324 
  return(r);
1342 mateusz.vi 325 
}
326 
 
327 
 
1327 mateusz.vi 328 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 329 
  unsigned char x;
1310 mateusz.vi 330 
  const struct line far *l;
1316 mateusz.vi 331 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 332 
 
1392 mateusz.vi 333 
  /* quit early if nothing to refresh */
334 
  if (uidirty.from == 0xff) return;
335 
 
1288 mateusz.vi 336 
#ifdef DBG_REFRESH
1282 mateusz.vi 337 
  static char m = 'a';
338 
  m++;
339 
  if (m > 'z') m = 'a';
1288 mateusz.vi 340 
#endif
1282 mateusz.vi 341 
 
1310 mateusz.vi 342 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 343 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 344 
 
1310 mateusz.vi 345 
  /* iterate over lines and redraw whatever needs to be redrawn */
346 
  for (; l != NULL; l = l->next, y++) {
347 
 
348 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 349 
    if (y < uidirty.from) continue;
350 
    if (y > uidirty.to) break;
1282 mateusz.vi 351 
 
1318 mateusz.vi 352 
    x = 0;
1275 mateusz.vi 353 
    if (db->xoffset < l->len) {
1318 mateusz.vi 354 
      unsigned char i, limit;
355 
      if (l->len - db->xoffset < screenw) {
356 
        limit = l->len;
357 
      } else {
1427 mateusz.vi 358 
        limit = db->xoffset + screenlastcol;
1318 mateusz.vi 359 
      }
1333 mateusz.vi 360 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 361 
    }
1282 mateusz.vi 362 
 
1318 mateusz.vi 363 
    /* write empty spaces until end of line */
1427 mateusz.vi 364 
    if (x < screenlastcol) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenlastcol - x);
1318 mateusz.vi 365 
 
1288 mateusz.vi 366 
#ifdef DBG_REFRESH
1333 mateusz.vi 367 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 368 
#endif
1282 mateusz.vi 369 
 
1275 mateusz.vi 370 
    if (y == screenh - 2) break;
371 
  }
1310 mateusz.vi 372 
 
1319 mateusz.vi 373 
  /* fill all lines below if empty (and they need to be redrawn) */
374 
  if (l == NULL) {
1427 mateusz.vi 375 
    while ((y < screenlastrow) && (y < uidirty.to)) {
376 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenlastcol);
1319 mateusz.vi 377 
    }
1318 mateusz.vi 378 
  }
1328 mateusz.vi 379 
 
380 
  /* scroll bar */
1427 mateusz.vi 381 
  for (y = 0; y < screenlastrow; y++) {
382 
    mdr_cout_char(y, screenlastcol, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 383 
  }
384 
 
385 
  /* scroll cursor */
386 
  if (db->totlines >= screenh) {
387 
    unsigned short topline = db->curline - db->cursorposy;
388 
    unsigned short col;
389 
    unsigned short totlines = db->totlines - screenh + 1;
390 
    if (db->totlines - screenh > screenh) {
1427 mateusz.vi 391 
      col = topline / (totlines / screenlastrow);
1328 mateusz.vi 392 
    } else {
1427 mateusz.vi 393 
      col = topline * screenlastrow / totlines;
1328 mateusz.vi 394 
    }
1427 mateusz.vi 395 
    if (col >= screenlastrow) col = screenh - 2;
396 
    mdr_cout_char(col, screenlastcol, ' ', SCHEME_SCROLL);
1328 mateusz.vi 397 
  }
1392 mateusz.vi 398 
 
399 
  /* clear out the dirty flag */
400 
  uidirty.from = 0xff;
1275 mateusz.vi 401 
}
402 
 
403 
 
1327 mateusz.vi 404 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 405 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 406 
 
407 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 408 
    db->cursorposx = 0;
1275 mateusz.vi 409 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 410 
    uidirty.from = 0;
411 
    uidirty.to = 0xff;
1275 mateusz.vi 412 
  } else {
1316 mateusz.vi 413 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 414 
  }
415 
}
416 
 
417 
 
1327 mateusz.vi 418 
static void cursor_up(struct file *db) {
1422 mateusz.vi 419 
  if (db->cursor->prev == NULL) return;
420 
 
421 
  db->curline -= 1;
422 
  db->cursor = db->cursor->prev;
423 
  if (db->cursorposy == 0) {
424 
    uidirty.from = 0;
425 
    uidirty.to = 0xff;
426 
  } else {
427 
    db->cursorposy -= 1;
1275 mateusz.vi 428 
  }
429 
}
430 
 
431 
 
1327 mateusz.vi 432 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 433 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 434 
  if (db->xoffset > db->cursor->len) {
435 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 436 
    uidirty.from = 0;
437 
    uidirty.to = 0xff;
1282 mateusz.vi 438 
  }
439 
 
1427 mateusz.vi 440 
  if (db->xoffset + screenlastcol <= db->cursor->len) {
1282 mateusz.vi 441 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 442 
    uidirty.from = 0;
443 
    uidirty.to = 0xff;
1282 mateusz.vi 444 
  }
1316 mateusz.vi 445 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 446 
}
447 
 
448 
 
1327 mateusz.vi 449 
static void cursor_down(struct file *db) {
1422 mateusz.vi 450 
  if (db->cursor->next == NULL) return;
451 
 
452 
  db->curline += 1;
453 
  db->cursor = db->cursor->next;
454 
  if (db->cursorposy < screenh - 2) {
455 
    db->cursorposy += 1;
456 
  } else {
457 
    uidirty.from = 0;
458 
    uidirty.to = 0xff;
1276 mateusz.vi 459 
  }
460 
}
461 
 
462 
 
1327 mateusz.vi 463 
static void cursor_left(struct file *db) {
1316 mateusz.vi 464 
  if (db->cursorposx > 0) {
465 
    db->cursorposx -= 1;
1302 mateusz.vi 466 
  } else if (db->xoffset > 0) {
467 
    db->xoffset -= 1;
1327 mateusz.vi 468 
    uidirty.from = 0;
469 
    uidirty.to = 0xff;
1302 mateusz.vi 470 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 471 
    cursor_up(db);
472 
    cursor_eol(db);
1302 mateusz.vi 473 
  }
474 
}
475 
 
476 
 
1327 mateusz.vi 477 
static void cursor_home(struct file *db) {
1316 mateusz.vi 478 
  db->cursorposx = 0;
1282 mateusz.vi 479 
  if (db->xoffset != 0) {
480 
    db->xoffset = 0;
1327 mateusz.vi 481 
    uidirty.from = 0;
482 
    uidirty.to = 0xff;
1282 mateusz.vi 483 
  }
1276 mateusz.vi 484 
}
485 
 
486 
 
1327 mateusz.vi 487 
static void cursor_right(struct file *db) {
1316 mateusz.vi 488 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
489 
    if (db->cursorposx < screenw - 2) {
490 
      db->cursorposx += 1;
1308 mateusz.vi 491 
    } else {
492 
      db->xoffset += 1;
1327 mateusz.vi 493 
      uidirty.from = 0;
494 
      uidirty.to = 0xff;
1308 mateusz.vi 495 
    }
1357 mateusz.vi 496 
  } else if (db->cursor->next != NULL) { /* jump to start of next line */
1327 mateusz.vi 497 
    cursor_down(db);
498 
    cursor_home(db);
1308 mateusz.vi 499 
  }
500 
}
501 
 
502 
 
1327 mateusz.vi 503 
static void del(struct file *db) {
1316 mateusz.vi 504 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
505 
    _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 506 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 507 
    uidirty.from = db->cursorposy;
508 
    uidirty.to = db->cursorposy;
1393 mateusz.vi 509 
    db->modflag = 1;
1292 mateusz.vi 510 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
511 
    struct line far *nextline = db->cursor->next;
512 
    if (db->cursor->next->len > 0) {
1340 mateusz.vi 513 
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
1337 mateusz.vi 514 
        _fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 515 
        db->cursor->len += db->cursor->next->len;
516 
      }
517 
    }
1340 mateusz.vi 518 
 
1292 mateusz.vi 519 
    db->cursor->next = db->cursor->next->next;
520 
    db->cursor->next->prev = db->cursor;
1340 mateusz.vi 521 
 
1339 mateusz.vi 522 
    line_free(nextline);
1327 mateusz.vi 523 
    uidirty.from = db->cursorposy;
524 
    uidirty.to = 0xff;
1328 mateusz.vi 525 
    db->totlines -= 1;
1393 mateusz.vi 526 
    db->modflag = 1;
1292 mateusz.vi 527 
  }
528 
}
529 
 
530 
 
1327 mateusz.vi 531 
static void bkspc(struct file *db) {
1302 mateusz.vi 532 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1421 mateusz.vi 533 
  if ((db->cursorposx + db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 534 
 
1327 mateusz.vi 535 
  cursor_left(db);
536 
  del(db);
1302 mateusz.vi 537 
}
538 
 
539 
 
1346 mateusz.vi 540 
/* returns 0 on success, 1 on file not found, 2 on other error */
1359 mateusz.vi 541 
static int loadfile(struct file *db, const char *fname) {
1324 mateusz.vi 542 
  char buff[512]; /* read one entire sector at a time (faster) */
543 
  char *buffptr;
544 
  unsigned int len, llen;
1287 mateusz.vi 545 
  int fd;
1324 mateusz.vi 546 
  unsigned char eolfound;
1287 mateusz.vi 547 
 
1355 mateusz.vi 548 
  /* free the entire linked list of lines */
549 
  db_rewind(db);
550 
  while (db->cursor) {
551 
    struct line far *victim;
552 
    victim = db->cursor;
553 
    db->cursor = db->cursor->next;
554 
    line_free(victim);
555 
  }
1321 mateusz.vi 556 
 
1355 mateusz.vi 557 
  /* zero out the struct */
558 
  bzero(db, sizeof(struct file));
559 
 
1418 mateusz.vi 560 
  if (fname == NULL) goto SKIPLOADING;
1321 mateusz.vi 561 
 
1355 mateusz.vi 562 
  memcpy(db->fname, fname, strlen(fname));
563 
 
1287 mateusz.vi 564 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
1346 mateusz.vi 565 
    return(1);
1287 mateusz.vi 566 
  }
567 
 
1313 mateusz.vi 568 
  db->lfonly = 1;
569 
 
1324 mateusz.vi 570 
  /* start by adding an empty line */
1328 mateusz.vi 571 
  if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 572 
    /* TODO ERROR HANDLING */
573 
  }
1287 mateusz.vi 574 
 
1324 mateusz.vi 575 
  for (eolfound = 0;;) {
576 
    unsigned short consumedbytes;
577 
 
578 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
579 
    buffptr = buff;
580 
 
581 
    FINDLINE:
582 
 
1361 mateusz.vi 583 
    /* look for nearest \n (also expand tabs) */
1324 mateusz.vi 584 
    for (consumedbytes = 0;; consumedbytes++) {
1361 mateusz.vi 585 
 
586 
      if (buffptr[consumedbytes] == '\t') {
587 
        llen = consumedbytes;
588 
        break;
589 
      }
590 
 
1324 mateusz.vi 591 
      if (consumedbytes == len) {
592 
        llen = consumedbytes;
593 
        break;
1323 mateusz.vi 594 
      }
1324 mateusz.vi 595 
      if (buffptr[consumedbytes] == '\r') {
596 
        llen = consumedbytes;
597 
        consumedbytes++;
598 
        db->lfonly = 0;
1320 mateusz.vi 599 
        break;
600 
      }
1324 mateusz.vi 601 
      if (buffptr[consumedbytes] == '\n') {
602 
        eolfound = 1;
603 
        llen = consumedbytes;
604 
        consumedbytes++;
605 
        break;
606 
      }
1287 mateusz.vi 607 
    }
1324 mateusz.vi 608 
 
609 
    /* consumedbytes is the amount of bytes processed from buffptr,
610 
     * llen is the length of line's payload (without its line terminator) */
611 
 
612 
    /* append content, if line is non-empty */
613 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1339 mateusz.vi 614 
      goto IOERR;
1287 mateusz.vi 615 
    }
616 
 
1419 mateusz.vi 617 
    /* allocate the next line if current line ended */
1324 mateusz.vi 618 
    if (eolfound) {
1328 mateusz.vi 619 
      if (line_add(db, NULL, 0) != 0) {
1339 mateusz.vi 620 
        goto IOERR;
1324 mateusz.vi 621 
      }
622 
      eolfound = 0;
623 
    }
1287 mateusz.vi 624 
 
1361 mateusz.vi 625 
    /* append 8 spaces if tab char found */
1412 mateusz.vi 626 
    if ((consumedbytes < len) && (buffptr[consumedbytes] == '\t') && (glob_tablessmode == 0)) {
1361 mateusz.vi 627 
      consumedbytes++;
628 
      if (line_append(db, "        ", 8) != 0) {
629 
        goto IOERR;
630 
      }
631 
    }
632 
 
1324 mateusz.vi 633 
    /* anything left? process the buffer leftover again */
634 
    if (consumedbytes < len) {
635 
      len -= consumedbytes;
636 
      buffptr += consumedbytes;
637 
      goto FINDLINE;
638 
    }
639 
 
640 
  }
641 
 
1287 mateusz.vi 642 
  _dos_close(fd);
643 
 
1321 mateusz.vi 644 
  SKIPLOADING:
645 
 
1320 mateusz.vi 646 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
1339 mateusz.vi 647 
  if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
648 
  db_rewind(db);
1320 mateusz.vi 649 
 
1346 mateusz.vi 650 
  return(0);
1339 mateusz.vi 651 
 
652 
  IOERR:
653 
  _dos_close(fd);
1346 mateusz.vi 654 
  return(2);
1287 mateusz.vi 655 
}
656 
 
657 
 
1356 mateusz.vi 658 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
659 
 * of argc and argv, saves some 330 bytes of binary size
660 
 * returns non-zero on error */
661 
static int parseargv(struct file *dbarr) {
662 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
663 
  unsigned short count = 0;
664 
  char *arg;
665 
  unsigned short lastarg = 0;
1359 mateusz.vi 666 
  int err;
1356 mateusz.vi 667 
 
668 
  while (!lastarg) {
669 
    /* jump to nearest arg */
670 
    while (*tail == ' ') {
671 
      *tail = 0;
672 
      tail++;
673 
    }
674 
 
675 
    if (*tail == '\r') {
676 
      *tail = 0;
677 
      break;
678 
    }
679 
 
680 
    arg = tail;
681 
 
682 
    /* jump to next delimiter */
683 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
684 
 
685 
    /* if \r then remember this is the last arg */
686 
    if (*tail == '\r') lastarg = 1;
687 
 
688 
    *tail = 0;
689 
    tail++;
690 
 
691 
    /* look at the arg now */
692 
    if (*arg == '/') {
1412 mateusz.vi 693 
      if (arg[1] == 't') { /* /t = do not expand tabs */
694 
        glob_tablessmode = 1;
695 
 
696 
      } else if (arg[1] == 'm') { /* /m = force mono mode */
697 
        glob_monomode = 1;
698 
 
699 
      } else {  /* help screen */
1419 mateusz.vi 700 
        mdr_coutraw_str(svarlang_str(1,3)); /* Sved, the SvarDOS editor */
1412 mateusz.vi 701 
        mdr_coutraw_str(" [");
1419 mateusz.vi 702 
        mdr_coutraw_str(svarlang_str(1,4)); /* ver */
1412 mateusz.vi 703 
        mdr_coutraw_puts(" " PVER "]");
704 
        mdr_coutraw_puts("Copyright (C) " PDATE " Mateusz Viste");
705 
        mdr_coutraw_crlf();
1433 mateusz.vi 706 
        mdr_coutraw_str("sved [/m] [/t] ");
1412 mateusz.vi 707 
        mdr_coutraw_puts(svarlang_str(1,1)); /* args syntax */
708 
        mdr_coutraw_crlf();
709 
        mdr_coutraw_puts(svarlang_str(1,10)); /* /m */
710 
        mdr_coutraw_puts(svarlang_str(1,11)); /* /t */
711 
        return(-1);
1387 mateusz.vi 712 
      }
1412 mateusz.vi 713 
      continue;
1356 mateusz.vi 714 
    }
715 
 
716 
    /* looks to be a filename */
717 
    if (count == 10) {
1420 mateusz.vi 718 
      mdr_coutraw_puts(svarlang_str(0,12)); /* too many files */
719 
      return(-1);
1356 mateusz.vi 720 
    }
721 
 
722 
    /* try loading it */
1387 mateusz.vi 723 
    mdr_coutraw_str(svarlang_str(1,2));
724 
    mdr_coutraw_char(' ');
1356 mateusz.vi 725 
    mdr_coutraw_puts(arg);
726 
    err = loadfile(&(dbarr[count]), arg);
727 
    if (err) {
728 
      if (err == 1) { /* file not found */
1396 mateusz.vi 729 
        if ((count == 0) && (lastarg != 0)) { /* a 'file not found' is fine if only one file was given */
730 
          memcpy(dbarr[count].fname, arg, strlen(arg) + 1);
731 
          err = 0;
732 
        } else {
733 
          err = 11;
734 
        }
1356 mateusz.vi 735 
      } else { /* general error */
736 
        err = 10;
737 
      }
1396 mateusz.vi 738 
      if (err) {
739 
        mdr_coutraw_puts(svarlang_str(0,err));
740 
        return(-1);
741 
      }
1356 mateusz.vi 742 
    }
743 
    count++;
744 
  }
745 
 
746 
  return(0);
747 
}
748 
 
749 
 
1332 mateusz.vi 750 
static int savefile(const struct file *db, const char *newfname) {
1311 mateusz.vi 751 
  int fd;
752 
  const struct line far *l;
1417 mateusz.vi 753 
  unsigned int bytes;
1313 mateusz.vi 754 
  unsigned char eollen;
755 
  unsigned char eolbuf[2];
1332 mateusz.vi 756 
  int errflag = 0;
1313 mateusz.vi 757 
 
1332 mateusz.vi 758 
  /* either create a new file if newfname provided, or... */
759 
  if (newfname) {
760 
    if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
761 
  } else { /* ...open db->fname */
762 
    if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
1311 mateusz.vi 763 
  }
764 
 
765 
  l = db->cursor;
766 
  while (l->prev) l = l->prev;
767 
 
1313 mateusz.vi 768 
  /* preset line terminators */
769 
  if (db->lfonly) {
770 
    eolbuf[0] = '\n';
771 
    eollen = 1;
772 
  } else {
773 
    eolbuf[0] = '\r';
774 
    eolbuf[1] = '\n';
775 
    eollen = 2;
776 
  }
777 
 
1311 mateusz.vi 778 
  while (l) {
1324 mateusz.vi 779 
    /* do not write the last empty line, it is only useful for edition */
780 
    if (l->len != 0) {
1332 mateusz.vi 781 
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
1324 mateusz.vi 782 
    } else if (l->next == NULL) {
783 
      break;
784 
    }
1332 mateusz.vi 785 
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
1311 mateusz.vi 786 
    l = l->next;
787 
  }
788 
 
1332 mateusz.vi 789 
  errflag |= _dos_close(fd);
1330 mateusz.vi 790 
 
1332 mateusz.vi 791 
  return(errflag);
1311 mateusz.vi 792 
}
793 
 
794 
 
1327 mateusz.vi 795 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1340 mateusz.vi 796 
  if (curline_resize(db, db->cursor->len + len) == 0) {
1317 mateusz.vi 797 
    unsigned short off = db->xoffset + db->cursorposx;
1393 mateusz.vi 798 
    db->modflag = 1;
1317 mateusz.vi 799 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
800 
    db->cursor->len += len;
1327 mateusz.vi 801 
    uidirty.from = db->cursorposy;
802 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 803 
    while (len--) {
804 
      db->cursor->payload[off++] = *databuf;
805 
      databuf++;
1327 mateusz.vi 806 
      cursor_right(db);
1317 mateusz.vi 807 
    }
808 
  }
809 
}
810 
 
811 
 
1343 mateusz.vi 812 
/* recompute db->curline by counting nodes in linked list */
813 
static void recompute_curline(struct file *db) {
814 
  const struct line far *l = db->cursor;
815 
 
816 
  db->curline = 0;
817 
  while (l->prev != NULL) {
818 
    db->curline += 1;
819 
    l = l->prev;
820 
  }
821 
}
822 
 
823 
 
1354 mateusz.vi 824 
enum MENU_ACTION {
1393 mateusz.vi 825 
  MENU_NONE   = 0,
826 
  MENU_OPEN   = 1,
827 
  MENU_SAVE   = 2,
828 
  MENU_SAVEAS = 3,
829 
  MENU_CLOSE  = 4,
830 
  MENU_CHGEOL = 5,
1418 mateusz.vi 831 
  MENU_QUIT   = 6
1354 mateusz.vi 832 
};
833 
 
834 
static enum MENU_ACTION ui_menu(void) {
835 
  unsigned short i, curchoice, attr, x, slen;
1393 mateusz.vi 836 
  unsigned short xorigin, yorigin;
1354 mateusz.vi 837 
 
838 
  /* find out the longest string */
839 
  slen = 0;
1355 mateusz.vi 840 
  for (i = MENU_OPEN; i <= MENU_QUIT; i++) {
1354 mateusz.vi 841 
    x = strlen(svarlang_str(8, i));
842 
    if (x > slen) slen = x;
843 
  }
844 
 
1393 mateusz.vi 845 
  /* calculate where to draw the menu on screen */
846 
  xorigin = (screenw - (slen + 5)) / 2;
1395 mateusz.vi 847 
  yorigin = (screenh - (MENU_QUIT - MENU_OPEN + 6)) / 2;
1393 mateusz.vi 848 
 
1395 mateusz.vi 849 
  /* */
850 
  uidirty.from = yorigin;
851 
  uidirty.to = 0xff;
852 
  uidirty.statusbar = 1;
853 
 
854 
  /* hide the cursor */
855 
  mdr_cout_cursor_hide();
856 
 
1355 mateusz.vi 857 
  curchoice = MENU_OPEN;
1354 mateusz.vi 858 
  for (;;) {
859 
    /* render menu */
1393 mateusz.vi 860 
    for (i = MENU_NONE; i <= MENU_QUIT + 1; i++) {
861 
      mdr_cout_char_rep(yorigin + i, xorigin, ' ', SCHEME_MENU, slen+4);
1354 mateusz.vi 862 
      if (i == curchoice) {
863 
        attr = SCHEME_MENU_CUR;
1415 mateusz.vi 864 
        mdr_cout_char_rep(yorigin + i, xorigin + 1, ' ', SCHEME_MENU_SEL, slen + 2);
1354 mateusz.vi 865 
      } else {
866 
        attr = SCHEME_MENU;
867 
      }
1416 mateusz.vi 868 
      mdr_cout_str(yorigin + i, xorigin + 2, svarlang_str(8, i), attr, slen);
1354 mateusz.vi 869 
    }
870 
    /* wait for key */
1410 mateusz.vi 871 
    switch (mdr_dos_getkey2()) {
1354 mateusz.vi 872 
      case 0x150: /* down */
873 
        if (curchoice == MENU_QUIT) {
1355 mateusz.vi 874 
          curchoice = MENU_OPEN;
1354 mateusz.vi 875 
        } else {
876 
          curchoice++;
877 
        }
878 
        break;
879 
      case 0x148: /* up */
1355 mateusz.vi 880 
        if (curchoice == MENU_OPEN) {
1354 mateusz.vi 881 
          curchoice = MENU_QUIT;
882 
        } else {
883 
          curchoice--;
884 
        }
885 
        break;
1395 mateusz.vi 886 
      default:
887 
        curchoice = MENU_NONE;
888 
        /* FALLTHRU */
889 
      case '\r': /* ENTER */
890 
        mdr_cout_cursor_show();
891 
        return(curchoice);
1354 mateusz.vi 892 
    }
893 
  }
894 
}
895 
 
896 
 
1426 mateusz.vi 897 
static struct file *select_slot(struct file *dbarr, unsigned char curfile) {
1355 mateusz.vi 898 
  uidirty.from = 0;
899 
  uidirty.to = 0xff;
900 
  uidirty.statusbar = 1;
901 
 
902 
  dbarr = &(dbarr[curfile]);
1415 mateusz.vi 903 
  /* force redraw now, because the main() routine might not if this is exit
904 
   * time and we want to show the user which file has unsaved changes */
1435 mateusz.vi 905 
  ui_statusbar(dbarr, curfile);
1355 mateusz.vi 906 
  ui_refresh(dbarr);
907 
  return(dbarr);
908 
}
909 
 
910 
 
1347 mateusz.vi 911 
/* main returns nothing, ie. sved always exits with a zero exit code
912 
 * (this saves 20 bytes of executable footprint) */
913 
void main(void) {
1355 mateusz.vi 914 
  static struct file dbarr[10];
1426 mateusz.vi 915 
  unsigned char curfile;
1355 mateusz.vi 916 
  struct file *db = dbarr; /* visible file is the first slot by default */
1410 mateusz.vi 917 
  struct line far *clipboard = NULL;
1414 mateusz.vi 918 
  unsigned char original_breakflag;
1275 mateusz.vi 919 
 
1418 mateusz.vi 920 
  { /* load NLS resource */
1364 mateusz.vi 921 
    unsigned short i = 0;
922 
    const char far *selfptr;
923 
    char self[128], lang[8];
924 
    selfptr = mdr_dos_selfexe();
925 
    if (selfptr != NULL) {
926 
      do {
927 
        self[i] = selfptr[i];
928 
      } while (self[i++] != 0);
929 
      svarlang_autoload_exepath(self, mdr_dos_getenv(lang, "LANG", sizeof(lang)));
930 
    }
1307 mateusz.vi 931 
  }
1282 mateusz.vi 932 
 
1355 mateusz.vi 933 
  /* preload all slots with empty files */
934 
  for (curfile = 9;; curfile--) {
1418 mateusz.vi 935 
    loadfile(&(dbarr[curfile]), NULL);
1355 mateusz.vi 936 
    if (curfile == 0) break;
937 
  }
938 
 
1356 mateusz.vi 939 
  /* parse argv (and load files, if any passed on) */
940 
  if (parseargv(dbarr) != 0) return;
1282 mateusz.vi 941 
 
1412 mateusz.vi 942 
  if ((mdr_cout_init(&screenw, &screenh) != 0) && (glob_monomode == 0)) {
1333 mateusz.vi 943 
    /* load color scheme if mdr_cout_init returns a color flag */
944 
    SCHEME_TEXT = 0x17;
1354 mateusz.vi 945 
    SCHEME_MENU = 0x70;
1388 mateusz.vi 946 
    SCHEME_MENU_CUR = 0x6f;
947 
    SCHEME_MENU_SEL = 0x66;
1333 mateusz.vi 948 
    SCHEME_STBAR1 = 0x70;
949 
    SCHEME_STBAR2 = 0x78;
1392 mateusz.vi 950 
    SCHEME_STBAR3 = 0x3f;
1333 mateusz.vi 951 
    SCHEME_SCROLL = 0x70;
1388 mateusz.vi 952 
    SCHEME_MSG = 0x6f;
1333 mateusz.vi 953 
    SCHEME_ERR = 0x4f;
954 
  }
1427 mateusz.vi 955 
  screenlastrow = screenh - 1;
956 
  screenlastcol = screenw - 1;
1275 mateusz.vi 957 
 
1414 mateusz.vi 958 
  /* instruct DOS to stop detecting CTRL+C because user needs it for
959 
   * copy/paste operations. also remember the original status of the BREAK
960 
   * flag so I can restore it as it was before quitting. */
961 
  original_breakflag = mdr_dos_ctrlc_disable();
1410 mateusz.vi 962 
 
1275 mateusz.vi 963 
  for (;;) {
964 
    int k;
965 
 
1362 mateusz.vi 966 
    /* add an extra empty line if cursor is on last line and this line is not empty */
967 
    if ((db->cursor->next == NULL) && (db->cursor->len != 0)) {
968 
      if (line_add(db, NULL, 0) == 0) {
969 
        db->cursor = db->cursor->prev; /* line_add() changes the cursor pointer */
1437 mateusz.vi 970 
        db->curline -= 1;
1362 mateusz.vi 971 
      }
972 
    }
973 
 
1327 mateusz.vi 974 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 975 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 976 
 
1392 mateusz.vi 977 
    ui_refresh(db);
978 
 
1436 mateusz.vi 979 
    if ((uidirty.statusbar != 0) || (db->modflagprev != db->modflag) || (db->curline_prev != db->curline)) {
1435 mateusz.vi 980 
      ui_statusbar(db, curfile);
1342 mateusz.vi 981 
      uidirty.statusbar = 0;
1355 mateusz.vi 982 
      db->modflagprev = db->modflag;
1436 mateusz.vi 983 
      db->curline_prev = db->curline;
1342 mateusz.vi 984 
    }
1328 mateusz.vi 985 
#ifdef DBG_LINENUM
986 
      {
987 
        char ddd[10];
988 
        db->curline += 1;
989 
        ddd[0] = '0' + db->curline / 100;
990 
        ddd[1] = '0' + (db->curline % 100) / 10;
991 
        ddd[2] = '0' + (db->curline % 10);
992 
        db->curline -= 1;
993 
        ddd[3] = '/';
994 
        ddd[4] = '0' + db->totlines / 100;
995 
        ddd[5] = '0' + (db->totlines % 100) / 10;
996 
        ddd[6] = '0' + (db->totlines % 10);
997 
        ddd[7] = 0;
1333 mateusz.vi 998 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 999 
      }
1000 
#endif
1275 mateusz.vi 1001 
 
1410 mateusz.vi 1002 
    k = mdr_dos_getkey2();
1282 mateusz.vi 1003 
 
1275 mateusz.vi 1004 
    if (k == 0x150) { /* down */
1327 mateusz.vi 1005 
      cursor_down(db);
1275 mateusz.vi 1006 
 
1007 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 1008 
      cursor_up(db);
1275 mateusz.vi 1009 
 
1010 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 1011 
      cursor_right(db);
1275 mateusz.vi 1012 
 
1013 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 1014 
      cursor_left(db);
1275 mateusz.vi 1015 
 
1282 mateusz.vi 1016 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 1017 
      unsigned char dist = db->cursorposy + screenh - 1;
1018 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
1019 
        db->cursor = db->cursor->prev;
1020 
        dist--;
1021 
      }
1022 
      if (dist != 0) {
1023 
        db->cursorposy = 0;
1024 
        db->cursorposx = 0;
1025 
      } else {
1026 
        dist = db->cursorposy;
1027 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
1028 
      }
1029 
      uidirty.from = 0;
1030 
      uidirty.to = 0xff;
1343 mateusz.vi 1031 
      recompute_curline(db);
1282 mateusz.vi 1032 
 
1033 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 1034 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
1035 
      while ((dist != 0) && (db->cursor->next != NULL)) {
1036 
        db->cursor = db->cursor->next;
1037 
        dist--;
1038 
      }
1039 
      if (dist != 0) {
1040 
        db->cursorposy = screenh - 2;
1041 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
1042 
        db->cursorposx = 0;
1043 
      } else {
1044 
        dist = screenh - 2 - db->cursorposy;
1045 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
1046 
      }
1047 
      uidirty.from = 0;
1048 
      uidirty.to = 0xff;
1343 mateusz.vi 1049 
      recompute_curline(db);
1282 mateusz.vi 1050 
 
1051 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 1052 
       cursor_home(db);
1282 mateusz.vi 1053 
 
1054 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 1055 
       cursor_eol(db);
1282 mateusz.vi 1056 
 
1275 mateusz.vi 1057 
    } else if (k == 0x1B) { /* ESC */
1354 mateusz.vi 1058 
      int quitnow = 0;
1394 mateusz.vi 1059 
      char fname[64];
1354 mateusz.vi 1060 
      int saveflag = 0;
1393 mateusz.vi 1061 
      enum MENU_ACTION ui_action;
1275 mateusz.vi 1062 
 
1392 mateusz.vi 1063 
      /* collect the exact menu action and clear the screen */
1064 
      ui_action = ui_menu();
1065 
      ui_refresh(db);
1354 mateusz.vi 1066 
 
1392 mateusz.vi 1067 
      switch (ui_action) {
1068 
 
1354 mateusz.vi 1069 
        case MENU_NONE:
1070 
          break;
1071 
 
1072 
        case MENU_OPEN:
1073 
          /* display a warning if unsaved changes are pending */
1074 
          if (db->modflag != 0) ui_msg(svarlang_str(0,4), svarlang_str(0,8), SCHEME_MSG);
1075 
 
1076 
          /* ask for filename */
1077 
          ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
1078 
          if (fname[0] != 0) {
1359 mateusz.vi 1079 
            int err;
1354 mateusz.vi 1080 
            err = loadfile(db, fname);
1081 
            if (err != 0) {
1082 
              if (err == 1) {
1083 
                ui_msg(svarlang_str(0,11), NULL, SCHEME_ERR); /* file not found */
1084 
              } else {
1085 
                ui_msg(svarlang_str(0,10), NULL, SCHEME_ERR);  /* ERROR */
1086 
              }
1087 
              mdr_bios_tickswait(44); /* 3s */
1418 mateusz.vi 1088 
              loadfile(db, NULL);
1354 mateusz.vi 1089 
            }
1090 
          }
1393 mateusz.vi 1091 
          uidirty.from = 0;
1092 
          uidirty.to = 0xff;
1093 
          uidirty.statusbar = 1;
1354 mateusz.vi 1094 
          break;
1095 
 
1096 
        case MENU_SAVEAS:
1097 
          saveflag = 1;
1098 
          /* FALLTHRU */
1099 
        case MENU_SAVE:
1100 
          if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
1101 
            ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
1102 
            if (*fname == 0) break;
1103 
            saveflag = savefile(db, fname);
1104 
            if (saveflag == 0) memcpy(db->fname, fname, sizeof(fname));
1105 
          } else {
1106 
            saveflag = savefile(db, NULL);
1107 
          }
1108 
 
1395 mateusz.vi 1109 
          mdr_cout_cursor_hide();
1110 
 
1354 mateusz.vi 1111 
          if (saveflag == 0) {
1112 
            db->modflag = 0;
1113 
            ui_msg(svarlang_str(0, 2), NULL, SCHEME_MSG);
1114 
            mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
1115 
          } else {
1429 mateusz.vi 1116 
            ui_msg(svarlang_str(0, 10), NULL, SCHEME_ERR);
1354 mateusz.vi 1117 
            mdr_bios_tickswait(36); /* 2s */
1118 
          }
1395 mateusz.vi 1119 
          mdr_cout_cursor_show();
1354 mateusz.vi 1120 
          break;
1121 
 
1355 mateusz.vi 1122 
        case MENU_CLOSE:
1123 
          if (ui_confirm_if_unsaved(db) == 0) {
1418 mateusz.vi 1124 
            loadfile(db, NULL);
1355 mateusz.vi 1125 
          }
1126 
          uidirty.from = 0;
1127 
          uidirty.to = 0xff;
1128 
          uidirty.statusbar = 1;
1129 
          break;
1130 
 
1354 mateusz.vi 1131 
        case MENU_CHGEOL:
1393 mateusz.vi 1132 
          db->modflag = 1;
1354 mateusz.vi 1133 
          db->lfonly ^= 1;
1134 
          break;
1135 
 
1136 
        case MENU_QUIT:
1355 mateusz.vi 1137 
          quitnow = 1;
1138 
          for (curfile = 0; curfile < 10; curfile++) {
1139 
            if (dbarr[curfile].modflag) {
1140 
              db = select_slot(dbarr, curfile);
1441 mateusz.vi 1141 
              if (ui_confirm_if_unsaved(db) != 0) {
1142 
                quitnow = 0;
1143 
                break;
1144 
              }
1355 mateusz.vi 1145 
            }
1146 
          }
1354 mateusz.vi 1147 
          break;
1148 
      }
1149 
 
1150 
      if (quitnow) break;
1151 
 
1289 mateusz.vi 1152 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 1153 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 1154 
      /* add a new line */
1328 mateusz.vi 1155 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1393 mateusz.vi 1156 
        db->modflag = 1;
1328 mateusz.vi 1157 
        db->cursor = db->cursor->prev; /* back to original line */
1427 mateusz.vi 1158 
        db->curline -= 1;
1289 mateusz.vi 1159 
        /* trim the line above */
1328 mateusz.vi 1160 
        db->cursor->len = off;
1289 mateusz.vi 1161 
        /* move cursor to the (new) line below */
1328 mateusz.vi 1162 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 1163 
        uidirty.to = 0xff;
1328 mateusz.vi 1164 
        cursor_down(db);
1165 
        cursor_home(db);
1289 mateusz.vi 1166 
      } else {
1167 
        /* ERROR: OUT OF MEMORY */
1168 
      }
1169 
 
1292 mateusz.vi 1170 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 1171 
      del(db);
1292 mateusz.vi 1172 
 
1302 mateusz.vi 1173 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 1174 
      bkspc(db);
1302 mateusz.vi 1175 
 
1308 mateusz.vi 1176 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 1177 
      char c = k;
1327 mateusz.vi 1178 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 1179 
 
1317 mateusz.vi 1180 
    } else if (k == 0x009) { /* TAB */
1412 mateusz.vi 1181 
      if (glob_tablessmode == 0) {
1182 
        insert_in_line(db, "        ", 8);
1183 
      } else {
1184 
        insert_in_line(db, "\t", 1);
1185 
      }
1317 mateusz.vi 1186 
 
1355 mateusz.vi 1187 
    } else if ((k >= 0x13b) && (k <= 0x144)) { /* F1..F10 */
1188 
      curfile = k - 0x13b;
1189 
      db = select_slot(dbarr, curfile);
1309 mateusz.vi 1190 
 
1325 mateusz.vi 1191 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
1192 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
1193 
      for (;;) {
1194 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
1195 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 1196 
        cursor_right(db);
1325 mateusz.vi 1197 
      }
1198 
      /* now skip to next non-space or end of file */
1199 
      for (;;) {
1327 mateusz.vi 1200 
        cursor_right(db);
1325 mateusz.vi 1201 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1202 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
1203 
      }
1204 
 
1205 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 1206 
      cursor_left(db);
1325 mateusz.vi 1207 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
1208 
      for (;;) {
1209 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
1210 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 1211 
        cursor_left(db);
1325 mateusz.vi 1212 
      }
1213 
      /* now skip to next space or start of file */
1214 
      for (;;) {
1327 mateusz.vi 1215 
        cursor_left(db);
1325 mateusz.vi 1216 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 1217 
          cursor_right(db);
1325 mateusz.vi 1218 
          break;
1219 
        }
1220 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
1221 
      }
1222 
 
1410 mateusz.vi 1223 
    } else if ((k == 0x003) || (k == 0x018)) { /* CTRL+C or CTRL+X */
1224 
      /* free clipboard if anything in it */
1225 
      if (clipboard != NULL) line_free(clipboard);
1226 
 
1227 
      /* copy cursor line to clipboard */
1228 
      clipboard = line_calloc(db->cursor->len);
1229 
      if (clipboard == NULL) {
1230 
        ui_msg(svarlang_str(0, 10), NULL, SCHEME_ERR); /* ERROR */
1231 
        mdr_bios_tickswait(18); /* 1s */
1232 
      } else {
1427 mateusz.vi 1233 
        mdr_cout_char_rep(db->cursorposy, 0, ' ', ((SCHEME_TEXT >> 4) | (SCHEME_TEXT << 4)) & 0xff, screenlastcol);
1410 mateusz.vi 1234 
        uidirty.from = db->cursorposy;
1235 
        uidirty.to = db->cursorposy;
1236 
        if (db->cursor->len != 0) {
1237 
          _fmemmove(clipboard->payload, db->cursor->payload, db->cursor->len);
1238 
          clipboard->len = db->cursor->len;
1239 
        }
1240 
        mdr_bios_tickswait(2); /* ca 100ms */
1241 
 
1242 
        /* if this is about cutting the line (CTRL+X) then delete cur line */
1243 
        if ((k == 0x018) && ((db->cursor->next != NULL) || (db->cursor->prev != NULL))) {
1244 
          if (db->cursor->next) db->cursor->next->prev = db->cursor->prev;
1245 
          if (db->cursor->prev) db->cursor->prev->next = db->cursor->next;
1246 
          clipboard->prev = db->cursor;
1247 
          if (db->cursor->next) {
1248 
            db->cursor = db->cursor->next;
1249 
          } else {
1250 
            cursor_up(db);
1251 
          }
1252 
          line_free(clipboard->prev);
1423 mateusz.vi 1253 
          db->totlines -= 1;
1410 mateusz.vi 1254 
          uidirty.from = 0;
1255 
          uidirty.to = 0xff;
1412 mateusz.vi 1256 
          recompute_curline(db);
1410 mateusz.vi 1257 
        }
1258 
      }
1259 
 
1420 mateusz.vi 1260 
    } else if ((k == 0x016) && (clipboard != NULL)) { /* CTRL+V */
1261 
      if (line_add(db, clipboard->payload, clipboard->len) != 0) {
1262 
        ui_msg(svarlang_str(0, 10), NULL, SCHEME_ERR); /* ERROR */
1263 
        mdr_bios_tickswait(18); /* 1s */
1264 
      } else {
1265 
        /* rewire the linked list so the new line is on top of the previous one */
1266 
        clipboard->prev = db->cursor->prev;
1267 
        /* remove prev node from list */
1268 
        db->cursor->prev = db->cursor->prev->prev;
1269 
        if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor;
1270 
        /* insert the node after cursor now */
1271 
        clipboard->prev->next = db->cursor->next;
1272 
        if (db->cursor->next != NULL) db->cursor->next->prev = clipboard->prev;
1273 
        clipboard->prev->prev = db->cursor;
1274 
        db->cursor->next = clipboard->prev;
1275 
        cursor_down(db);
1410 mateusz.vi 1276 
      }
1277 
      uidirty.from = 0;
1278 
      uidirty.to = 0xff;
1412 mateusz.vi 1279 
      recompute_curline(db);
1410 mateusz.vi 1280 
 
1333 mateusz.vi 1281 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 1282 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
1283 
      char buff[4];
1284 
      const char *HEX = "0123456789ABCDEF";
1285 
      buff[0] = HEX[(k >> 8) & 15];
1286 
      buff[1] = HEX[(k >> 4) & 15];
1287 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 1288 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
1289 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1410 mateusz.vi 1290 
      mdr_dos_getkey2();
1275 mateusz.vi 1291 
      break;
1333 mateusz.vi 1292 
#endif
1275 mateusz.vi 1293 
    }
1294 
  }
1295 
 
1296 
  mdr_cout_close();
1297 
 
1414 mateusz.vi 1298 
  /* restore the DOS BREAK flag if it was originally set */
1299 
  if (original_breakflag != 0) mdr_dos_ctrlc_enable();
1300 
 
1320 mateusz.vi 1301 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 1302 
 
1347 mateusz.vi 1303 
  return;
1275 mateusz.vi 1304 
}