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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 
 
1453 mateusz.vi 37 
#define PVER "2023.2"
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 
 
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;
1461 mateusz.vi 96 
 
1341 mateusz.vi 97 
  if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);
1461 mateusz.vi 98 
 
1342 mateusz.vi 99 
  res = MK_FP(seg, 0);
1461 mateusz.vi 100 
  res->len = 0;
101 
  res->next = NULL;
102 
  res->prev = NULL;
103 
 
104 
  return(res);
1339 mateusz.vi 105 
}
106 
 
107 
 
108 
static void line_free(struct line far *ptr) {
109 
  _dos_freemem(FP_SEG(ptr));
110 
}
111 
 
112 
 
1348 mateusz.vi 113 
static int curline_resize(struct file far *db, unsigned short newsiz) {
1339 mateusz.vi 114 
  unsigned int maxavail;
115 
  struct line far *newptr;
116 
 
1341 mateusz.vi 117 
  /* try resizing the block (much faster) */
118 
  if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);
1339 mateusz.vi 119 
 
120 
  /* create a new block and copy data over */
121 
  newptr = line_calloc(newsiz);
1340 mateusz.vi 122 
  if (newptr == NULL) return(-1);
123 
  _fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
124 
 
125 
  /* rewire the linked list */
126 
  db->cursor = newptr;
127 
  if (newptr->next) newptr->next->prev = newptr;
128 
  if (newptr->prev) newptr->prev->next = newptr;
129 
 
130 
  return(0);
1339 mateusz.vi 131 
}
132 
 
133 
 
1328 mateusz.vi 134 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 135 
 * returns non-zero on error */
1328 mateusz.vi 136 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 137 
  struct line far *l;
1275 mateusz.vi 138 
 
1339 mateusz.vi 139 
  l = line_calloc(slen);
1287 mateusz.vi 140 
  if (l == NULL) return(-1);
141 
 
1275 mateusz.vi 142 
  l->prev = db->cursor;
143 
  if (db->cursor) {
144 
    l->next = db->cursor->next;
145 
    db->cursor->next = l;
146 
    l->next->prev = l;
147 
  }
148 
  db->cursor = l;
1342 mateusz.vi 149 
  if (slen > 0) {
150 
    _fmemmove(l->payload, line, slen);
151 
    l->len = slen;
152 
  }
1287 mateusz.vi 153 
 
1328 mateusz.vi 154 
  db->totlines += 1;
155 
  db->curline += 1;
156 
 
1287 mateusz.vi 157 
  return(0);
1275 mateusz.vi 158 
}
159 
 
160 
 
1348 mateusz.vi 161 
static void ui_getstring(const char *query, char *s, unsigned short maxlen) {
162 
  unsigned short len = 0;
163 
  unsigned char y, x;
1332 mateusz.vi 164 
  int k;
165 
 
166 
  if (maxlen == 0) return;
167 
  maxlen--; /* make room for the nul terminator */
168 
 
1427 mateusz.vi 169 
  y = screenlastrow;
1332 mateusz.vi 170 
 
171 
  /* print query string */
1333 mateusz.vi 172 
  x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);
173 
  mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 174 
 
175 
  for (;;) {
176 
    mdr_cout_locate(y, 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--;
189 
          mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);
190 
        }
191 
        break;
192 
      default:
193 
        if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
194 
          mdr_cout_char(y, x + len, k, SCHEME_STBAR3);
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 */
204 
static int line_append(struct file *f, const char far *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 
 
1435 mateusz.vi 224 
static void ui_statusbar(const struct file *db, unsigned char slotnum) {
1356 mateusz.vi 225 
  const char *s = svarlang_strid(0); /* ESC=MENU */
1348 mateusz.vi 226 
  unsigned short helpcol = screenw - strlen(s);
1440 mateusz.vi 227 
  unsigned short col;
1275 mateusz.vi 228 
 
1425 mateusz.vi 229 
  /* slot number (guaranteed to be 0-9) */
1355 mateusz.vi 230 
  {
231 
    char slot[4] = "#00";
1425 mateusz.vi 232 
    if (slotnum == 9) {
233 
      slot[1] = '1';
234 
    } else {
235 
      slotnum++;
236 
      slot[2] += slotnum;
237 
    }
1427 mateusz.vi 238 
    mdr_cout_str(screenlastrow, 0, slot, SCHEME_STBAR2, 3);
1355 mateusz.vi 239 
  }
1313 mateusz.vi 240 
 
1355 mateusz.vi 241 
  /* fill rest of status bar with background */
1427 mateusz.vi 242 
  mdr_cout_char_rep(screenlastrow, 3, ' ', SCHEME_STBAR1, helpcol - 3);
1355 mateusz.vi 243 
 
1313 mateusz.vi 244 
  /* eol type */
1330 mateusz.vi 245 
  {
246 
    const char *eoltype = "CRLF";
1353 mateusz.vi 247 
    if (db->lfonly) eoltype += 2;
1440 mateusz.vi 248 
    mdr_cout_str(screenlastrow, helpcol - 5, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 249 
  }
1313 mateusz.vi 250 
 
1438 mateusz.vi 251 
  /* line numbers */
1436 mateusz.vi 252 
  {
1438 mateusz.vi 253 
    unsigned short x;
254 
    unsigned char count = 0;
1440 mateusz.vi 255 
    col = helpcol - 7;
1438 mateusz.vi 256 
 
1439 mateusz.vi 257 
    x = db->totlines;
1438 mateusz.vi 258 
    AGAIN:
1436 mateusz.vi 259 
    do {
1439 mateusz.vi 260 
      mdr_cout_char(screenlastrow, col--, '0' + (x % 10), SCHEME_STBAR1);
1436 mateusz.vi 261 
      x /= 10;
262 
    } while (x);
1438 mateusz.vi 263 
    /* redo same exercise, but printing the current line now */
264 
    if (count == 0) {
265 
      count = 1;
1439 mateusz.vi 266 
      mdr_cout_char(screenlastrow, col--, '/', SCHEME_STBAR1);
1438 mateusz.vi 267 
      x = 1 + db->curline;
268 
      goto AGAIN;
269 
    }
1440 mateusz.vi 270 
  }
1438 mateusz.vi 271 
 
1440 mateusz.vi 272 
  /* filename and modflag */
273 
  {
274 
    const char *fn;
275 
    unsigned short x;
276 
    unsigned short maxfnlen = col - 6;
277 
    if (db->fname[0] == 0) {
278 
      fn = svarlang_str(0, 1); /* "UNTITLED" */
279 
    } else {
280 
      /* display filename up to maxfnlen chars */
281 
      fn = db->fname;
282 
      x = strlen(fn);
283 
      if (x > maxfnlen) fn += x - maxfnlen;
284 
    }
285 
    x = mdr_cout_str(screenlastrow, 4, fn, SCHEME_STBAR1, maxfnlen);
286 
    if (db->modflag) mdr_cout_char(screenlastrow, 5 + x, '!', SCHEME_STBAR2);
1436 mateusz.vi 287 
  }
288 
 
1427 mateusz.vi 289 
  mdr_cout_str(screenlastrow, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 290 
}
291 
 
292 
 
1331 mateusz.vi 293 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
1312 mateusz.vi 294 
  unsigned short x, y, msglen, i;
1428 mateusz.vi 295 
  unsigned short msg2flag = 0;
1331 mateusz.vi 296 
 
297 
  msglen = strlen(msg1);
298 
  if (msg2) {
299 
    msg2flag = 1;
300 
    i = strlen(msg2);
301 
    if (i > msglen) msglen = i;
302 
  }
303 
 
304 
  y = (screenh - 6) >> 1;
1312 mateusz.vi 305 
  x = (screenw - msglen - 4) >> 1;
1331 mateusz.vi 306 
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
307 
  x++;
1345 mateusz.vi 308 
 
1331 mateusz.vi 309 
  mdr_cout_str(y+1, x, msg1, attr, msglen);
310 
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
1312 mateusz.vi 311 
 
1327 mateusz.vi 312 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 313 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 314 
}
315 
 
316 
 
1412 mateusz.vi 317 
static unsigned char ui_confirm_if_unsaved(const struct file *db) {
1355 mateusz.vi 318 
  unsigned char r = 0;
1342 mateusz.vi 319 
  if (db->modflag == 0) return(0);
320 
 
1355 mateusz.vi 321 
  mdr_cout_cursor_hide();
322 
 
1342 mateusz.vi 323 
  /* if file has been modified then ask for confirmation */
324 
  ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);
1410 mateusz.vi 325 
  if (mdr_dos_getkey2() != '\r') r = 1;
1342 mateusz.vi 326 
 
1355 mateusz.vi 327 
  mdr_cout_cursor_show();
328 
 
329 
  return(r);
1342 mateusz.vi 330 
}
331 
 
332 
 
1327 mateusz.vi 333 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 334 
  unsigned char x;
1310 mateusz.vi 335 
  const struct line far *l;
1316 mateusz.vi 336 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 337 
 
1392 mateusz.vi 338 
  /* quit early if nothing to refresh */
339 
  if (uidirty.from == 0xff) return;
340 
 
1288 mateusz.vi 341 
#ifdef DBG_REFRESH
1282 mateusz.vi 342 
  static char m = 'a';
343 
  m++;
344 
  if (m > 'z') m = 'a';
1288 mateusz.vi 345 
#endif
1282 mateusz.vi 346 
 
1310 mateusz.vi 347 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 348 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 349 
 
1310 mateusz.vi 350 
  /* iterate over lines and redraw whatever needs to be redrawn */
351 
  for (; l != NULL; l = l->next, y++) {
352 
 
353 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 354 
    if (y < uidirty.from) continue;
355 
    if (y > uidirty.to) break;
1282 mateusz.vi 356 
 
1318 mateusz.vi 357 
    x = 0;
1275 mateusz.vi 358 
    if (db->xoffset < l->len) {
1318 mateusz.vi 359 
      unsigned char i, limit;
360 
      if (l->len - db->xoffset < screenw) {
361 
        limit = l->len;
362 
      } else {
1427 mateusz.vi 363 
        limit = db->xoffset + screenlastcol;
1318 mateusz.vi 364 
      }
1333 mateusz.vi 365 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 366 
    }
1282 mateusz.vi 367 
 
1318 mateusz.vi 368 
    /* write empty spaces until end of line */
1427 mateusz.vi 369 
    if (x < screenlastcol) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenlastcol - x);
1318 mateusz.vi 370 
 
1288 mateusz.vi 371 
#ifdef DBG_REFRESH
1333 mateusz.vi 372 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 373 
#endif
1282 mateusz.vi 374 
 
1275 mateusz.vi 375 
    if (y == screenh - 2) break;
376 
  }
1310 mateusz.vi 377 
 
1319 mateusz.vi 378 
  /* fill all lines below if empty (and they need to be redrawn) */
379 
  if (l == NULL) {
1427 mateusz.vi 380 
    while ((y < screenlastrow) && (y < uidirty.to)) {
381 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenlastcol);
1319 mateusz.vi 382 
    }
1318 mateusz.vi 383 
  }
1328 mateusz.vi 384 
 
385 
  /* scroll bar */
1427 mateusz.vi 386 
  for (y = 0; y < screenlastrow; y++) {
387 
    mdr_cout_char(y, screenlastcol, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 388 
  }
389 
 
390 
  /* scroll cursor */
391 
  if (db->totlines >= screenh) {
392 
    unsigned short topline = db->curline - db->cursorposy;
393 
    unsigned short col;
394 
    unsigned short totlines = db->totlines - screenh + 1;
395 
    if (db->totlines - screenh > screenh) {
1427 mateusz.vi 396 
      col = topline / (totlines / screenlastrow);
1328 mateusz.vi 397 
    } else {
1427 mateusz.vi 398 
      col = topline * screenlastrow / totlines;
1328 mateusz.vi 399 
    }
1427 mateusz.vi 400 
    if (col >= screenlastrow) col = screenh - 2;
401 
    mdr_cout_char(col, screenlastcol, ' ', SCHEME_SCROLL);
1328 mateusz.vi 402 
  }
1392 mateusz.vi 403 
 
404 
  /* clear out the dirty flag */
405 
  uidirty.from = 0xff;
1275 mateusz.vi 406 
}
407 
 
408 
 
1327 mateusz.vi 409 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 410 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 411 
 
412 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 413 
    db->cursorposx = 0;
1275 mateusz.vi 414 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 415 
    uidirty.from = 0;
416 
    uidirty.to = 0xff;
1275 mateusz.vi 417 
  } else {
1316 mateusz.vi 418 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 419 
  }
420 
}
421 
 
422 
 
1327 mateusz.vi 423 
static void cursor_up(struct file *db) {
1422 mateusz.vi 424 
  if (db->cursor->prev == NULL) return;
425 
 
426 
  db->curline -= 1;
427 
  db->cursor = db->cursor->prev;
428 
  if (db->cursorposy == 0) {
429 
    uidirty.from = 0;
430 
    uidirty.to = 0xff;
431 
  } else {
432 
    db->cursorposy -= 1;
1275 mateusz.vi 433 
  }
434 
}
435 
 
436 
 
1327 mateusz.vi 437 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 438 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 439 
  if (db->xoffset > db->cursor->len) {
440 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 441 
    uidirty.from = 0;
442 
    uidirty.to = 0xff;
1282 mateusz.vi 443 
  }
444 
 
1427 mateusz.vi 445 
  if (db->xoffset + screenlastcol <= db->cursor->len) {
1282 mateusz.vi 446 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 447 
    uidirty.from = 0;
448 
    uidirty.to = 0xff;
1282 mateusz.vi 449 
  }
1316 mateusz.vi 450 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 451 
}
452 
 
453 
 
1327 mateusz.vi 454 
static void cursor_down(struct file *db) {
1422 mateusz.vi 455 
  if (db->cursor->next == NULL) return;
456 
 
457 
  db->curline += 1;
458 
  db->cursor = db->cursor->next;
459 
  if (db->cursorposy < screenh - 2) {
460 
    db->cursorposy += 1;
461 
  } else {
462 
    uidirty.from = 0;
463 
    uidirty.to = 0xff;
1276 mateusz.vi 464 
  }
465 
}
466 
 
467 
 
1327 mateusz.vi 468 
static void cursor_left(struct file *db) {
1316 mateusz.vi 469 
  if (db->cursorposx > 0) {
470 
    db->cursorposx -= 1;
1302 mateusz.vi 471 
  } else if (db->xoffset > 0) {
472 
    db->xoffset -= 1;
1327 mateusz.vi 473 
    uidirty.from = 0;
474 
    uidirty.to = 0xff;
1302 mateusz.vi 475 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 476 
    cursor_up(db);
477 
    cursor_eol(db);
1302 mateusz.vi 478 
  }
479 
}
480 
 
481 
 
1327 mateusz.vi 482 
static void cursor_home(struct file *db) {
1316 mateusz.vi 483 
  db->cursorposx = 0;
1282 mateusz.vi 484 
  if (db->xoffset != 0) {
485 
    db->xoffset = 0;
1327 mateusz.vi 486 
    uidirty.from = 0;
487 
    uidirty.to = 0xff;
1282 mateusz.vi 488 
  }
1276 mateusz.vi 489 
}
490 
 
491 
 
1327 mateusz.vi 492 
static void cursor_right(struct file *db) {
1316 mateusz.vi 493 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
494 
    if (db->cursorposx < screenw - 2) {
495 
      db->cursorposx += 1;
1308 mateusz.vi 496 
    } else {
497 
      db->xoffset += 1;
1327 mateusz.vi 498 
      uidirty.from = 0;
499 
      uidirty.to = 0xff;
1308 mateusz.vi 500 
    }
1357 mateusz.vi 501 
  } else if (db->cursor->next != NULL) { /* jump to start of next line */
1327 mateusz.vi 502 
    cursor_down(db);
503 
    cursor_home(db);
1308 mateusz.vi 504 
  }
505 
}
506 
 
507 
 
1327 mateusz.vi 508 
static void del(struct file *db) {
1316 mateusz.vi 509 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
510 
    _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 511 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 512 
    uidirty.from = db->cursorposy;
513 
    uidirty.to = db->cursorposy;
1393 mateusz.vi 514 
    db->modflag = 1;
1292 mateusz.vi 515 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
516 
    struct line far *nextline = db->cursor->next;
517 
    if (db->cursor->next->len > 0) {
1340 mateusz.vi 518 
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
1337 mateusz.vi 519 
        _fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 520 
        db->cursor->len += db->cursor->next->len;
521 
      }
522 
    }
1340 mateusz.vi 523 
 
1292 mateusz.vi 524 
    db->cursor->next = db->cursor->next->next;
525 
    db->cursor->next->prev = db->cursor;
1340 mateusz.vi 526 
 
1339 mateusz.vi 527 
    line_free(nextline);
1327 mateusz.vi 528 
    uidirty.from = db->cursorposy;
529 
    uidirty.to = 0xff;
1328 mateusz.vi 530 
    db->totlines -= 1;
1393 mateusz.vi 531 
    db->modflag = 1;
1292 mateusz.vi 532 
  }
533 
}
534 
 
535 
 
1327 mateusz.vi 536 
static void bkspc(struct file *db) {
1302 mateusz.vi 537 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1421 mateusz.vi 538 
  if ((db->cursorposx + db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 539 
 
1327 mateusz.vi 540 
  cursor_left(db);
541 
  del(db);
1302 mateusz.vi 542 
}
543 
 
544 
 
1450 mateusz.vi 545 
#define LOADFILE_FILENOTFOUND 2
546 
 
1346 mateusz.vi 547 
/* returns 0 on success, 1 on file not found, 2 on other error */
1449 mateusz.vi 548 
static unsigned char loadfile(struct file *db, const char *fname) {
1324 mateusz.vi 549 
  char buff[512]; /* read one entire sector at a time (faster) */
550 
  char *buffptr;
551 
  unsigned int len, llen;
1287 mateusz.vi 552 
  int fd;
1324 mateusz.vi 553 
  unsigned char eolfound;
1449 mateusz.vi 554 
  unsigned char err = 0;
1287 mateusz.vi 555 
 
1355 mateusz.vi 556 
  /* free the entire linked list of lines */
557 
  db_rewind(db);
558 
  while (db->cursor) {
559 
    struct line far *victim;
560 
    victim = db->cursor;
561 
    db->cursor = db->cursor->next;
562 
    line_free(victim);
563 
  }
1321 mateusz.vi 564 
 
1355 mateusz.vi 565 
  /* zero out the struct */
566 
  bzero(db, sizeof(struct file));
567 
 
1448 mateusz.vi 568 
  /* start by adding an empty line */
569 
  if (line_add(db, NULL, 0) != 0) return(2);
570 
 
1418 mateusz.vi 571 
  if (fname == NULL) goto SKIPLOADING;
1321 mateusz.vi 572 
 
1444 mateusz.vi 573 
  mdr_dos_truename(db->fname, fname);
1355 mateusz.vi 574 
 
1450 mateusz.vi 575 
  err = _dos_open(fname, O_RDONLY, &fd);
576 
  if (err != 0) goto SKIPLOADING;
1287 mateusz.vi 577 
 
1313 mateusz.vi 578 
  db->lfonly = 1;
579 
 
1324 mateusz.vi 580 
  for (eolfound = 0;;) {
581 
    unsigned short consumedbytes;
582 
 
583 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
584 
    buffptr = buff;
585 
 
586 
    FINDLINE:
587 
 
1361 mateusz.vi 588 
    /* look for nearest \n (also expand tabs) */
1324 mateusz.vi 589 
    for (consumedbytes = 0;; consumedbytes++) {
1361 mateusz.vi 590 
 
591 
      if (buffptr[consumedbytes] == '\t') {
592 
        llen = consumedbytes;
593 
        break;
594 
      }
595 
 
1324 mateusz.vi 596 
      if (consumedbytes == len) {
597 
        llen = consumedbytes;
598 
        break;
1323 mateusz.vi 599 
      }
1324 mateusz.vi 600 
      if (buffptr[consumedbytes] == '\r') {
601 
        llen = consumedbytes;
602 
        consumedbytes++;
603 
        db->lfonly = 0;
1320 mateusz.vi 604 
        break;
605 
      }
1324 mateusz.vi 606 
      if (buffptr[consumedbytes] == '\n') {
607 
        eolfound = 1;
608 
        llen = consumedbytes;
609 
        consumedbytes++;
610 
        break;
611 
      }
1287 mateusz.vi 612 
    }
1324 mateusz.vi 613 
 
614 
    /* consumedbytes is the amount of bytes processed from buffptr,
615 
     * llen is the length of line's payload (without its line terminator) */
616 
 
617 
    /* append content, if line is non-empty */
618 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1339 mateusz.vi 619 
      goto IOERR;
1287 mateusz.vi 620 
    }
621 
 
1419 mateusz.vi 622 
    /* allocate the next line if current line ended */
1324 mateusz.vi 623 
    if (eolfound) {
1328 mateusz.vi 624 
      if (line_add(db, NULL, 0) != 0) {
1339 mateusz.vi 625 
        goto IOERR;
1324 mateusz.vi 626 
      }
627 
      eolfound = 0;
628 
    }
1287 mateusz.vi 629 
 
1361 mateusz.vi 630 
    /* append 8 spaces if tab char found */
1412 mateusz.vi 631 
    if ((consumedbytes < len) && (buffptr[consumedbytes] == '\t') && (glob_tablessmode == 0)) {
1361 mateusz.vi 632 
      consumedbytes++;
633 
      if (line_append(db, "        ", 8) != 0) {
634 
        goto IOERR;
635 
      }
636 
    }
637 
 
1324 mateusz.vi 638 
    /* anything left? process the buffer leftover again */
639 
    if (consumedbytes < len) {
640 
      len -= consumedbytes;
641 
      buffptr += consumedbytes;
642 
      goto FINDLINE;
643 
    }
644 
 
645 
  }
646 
 
1287 mateusz.vi 647 
  _dos_close(fd);
648 
 
1321 mateusz.vi 649 
  SKIPLOADING:
650 
 
1448 mateusz.vi 651 
  /* rewind cursor to top of file because it has been used by line_add() */
1339 mateusz.vi 652 
  db_rewind(db);
1320 mateusz.vi 653 
 
1448 mateusz.vi 654 
  return(err);
1339 mateusz.vi 655 
 
656 
  IOERR:
657 
  _dos_close(fd);
1450 mateusz.vi 658 
  return(1);
1287 mateusz.vi 659 
}
660 
 
661 
 
1356 mateusz.vi 662 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
663 
 * of argc and argv, saves some 330 bytes of binary size
664 
 * returns non-zero on error */
665 
static int parseargv(struct file *dbarr) {
666 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
667 
  unsigned short count = 0;
668 
  char *arg;
669 
  unsigned short lastarg = 0;
1449 mateusz.vi 670 
  unsigned char err;
1356 mateusz.vi 671 
 
672 
  while (!lastarg) {
673 
    /* jump to nearest arg */
674 
    while (*tail == ' ') {
675 
      *tail = 0;
676 
      tail++;
677 
    }
678 
 
679 
    if (*tail == '\r') {
680 
      *tail = 0;
681 
      break;
682 
    }
683 
 
684 
    arg = tail;
685 
 
686 
    /* jump to next delimiter */
687 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
688 
 
689 
    /* if \r then remember this is the last arg */
690 
    if (*tail == '\r') lastarg = 1;
691 
 
692 
    *tail = 0;
693 
    tail++;
694 
 
695 
    /* look at the arg now */
696 
    if (*arg == '/') {
1412 mateusz.vi 697 
      if (arg[1] == 't') { /* /t = do not expand tabs */
698 
        glob_tablessmode = 1;
699 
 
700 
      } else if (arg[1] == 'm') { /* /m = force mono mode */
701 
        glob_monomode = 1;
702 
 
703 
      } else {  /* help screen */
1419 mateusz.vi 704 
        mdr_coutraw_str(svarlang_str(1,3)); /* Sved, the SvarDOS editor */
1412 mateusz.vi 705 
        mdr_coutraw_str(" [");
1419 mateusz.vi 706 
        mdr_coutraw_str(svarlang_str(1,4)); /* ver */
1412 mateusz.vi 707 
        mdr_coutraw_puts(" " PVER "]");
708 
        mdr_coutraw_puts("Copyright (C) " PDATE " Mateusz Viste");
709 
        mdr_coutraw_crlf();
1433 mateusz.vi 710 
        mdr_coutraw_str("sved [/m] [/t] ");
1412 mateusz.vi 711 
        mdr_coutraw_puts(svarlang_str(1,1)); /* args syntax */
712 
        mdr_coutraw_crlf();
713 
        mdr_coutraw_puts(svarlang_str(1,10)); /* /m */
714 
        mdr_coutraw_puts(svarlang_str(1,11)); /* /t */
715 
        return(-1);
1387 mateusz.vi 716 
      }
1412 mateusz.vi 717 
      continue;
1356 mateusz.vi 718 
    }
719 
 
720 
    /* looks to be a filename */
721 
    if (count == 10) {
1420 mateusz.vi 722 
      mdr_coutraw_puts(svarlang_str(0,12)); /* too many files */
723 
      return(-1);
1356 mateusz.vi 724 
    }
725 
 
726 
    /* try loading it */
1387 mateusz.vi 727 
    mdr_coutraw_str(svarlang_str(1,2));
728 
    mdr_coutraw_char(' ');
1356 mateusz.vi 729 
    mdr_coutraw_puts(arg);
730 
    err = loadfile(&(dbarr[count]), arg);
731 
    if (err) {
1450 mateusz.vi 732 
      if (err == LOADFILE_FILENOTFOUND) { /* file not found */
1396 mateusz.vi 733 
        if ((count == 0) && (lastarg != 0)) { /* a 'file not found' is fine if only one file was given */
734 
          err = 0;
735 
        } else {
736 
          err = 11;
737 
        }
1356 mateusz.vi 738 
      } else { /* general error */
739 
        err = 10;
740 
      }
1396 mateusz.vi 741 
      if (err) {
742 
        mdr_coutraw_puts(svarlang_str(0,err));
743 
        return(-1);
744 
      }
1356 mateusz.vi 745 
    }
746 
    count++;
747 
  }
748 
 
749 
  return(0);
750 
}
751 
 
752 
 
1453 mateusz.vi 753 
static int savefile(const struct file *db, const char *saveas) {
754 
  int fd = 0;
1311 mateusz.vi 755 
  const struct line far *l;
1417 mateusz.vi 756 
  unsigned int bytes;
1454 mateusz.vi 757 
  unsigned char eollen = 2;
758 
  const unsigned char *eolbuf = "\r\n";
1332 mateusz.vi 759 
  int errflag = 0;
1313 mateusz.vi 760 
 
1453 mateusz.vi 761 
  /* if filename not overloaded then use the fname in db */
762 
  if (saveas == NULL) saveas = db->fname;
763 
 
764 
  _asm {
765 
    push ax
766 
    push cx
767 
    push dx
768 
 
769 
    mov ah, 0x3C    /* create or truncate file */
770 
    xor cx, cx      /* file attributes */
771 
    mov dx, saveas  /* works only in SMALL/TINY mode */
772 
    int 0x21
773 
    jnc DONE
774 
    mov errflag, ax
775 
    DONE:
776 
    mov fd, ax
777 
 
778 
    pop dx
779 
    pop cx
780 
    pop ax
1311 mateusz.vi 781 
  }
782 
 
1453 mateusz.vi 783 
  if (errflag != 0) return(-1);
784 
 
1311 mateusz.vi 785 
  l = db->cursor;
786 
  while (l->prev) l = l->prev;
787 
 
1313 mateusz.vi 788 
  /* preset line terminators */
789 
  if (db->lfonly) {
1454 mateusz.vi 790 
    eolbuf++;
791 
    eollen--;
1313 mateusz.vi 792 
  }
793 
 
1311 mateusz.vi 794 
  while (l) {
1324 mateusz.vi 795 
    /* do not write the last empty line, it is only useful for edition */
796 
    if (l->len != 0) {
1332 mateusz.vi 797 
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
1324 mateusz.vi 798 
    } else if (l->next == NULL) {
799 
      break;
800 
    }
1332 mateusz.vi 801 
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
1311 mateusz.vi 802 
    l = l->next;
803 
  }
804 
 
1332 mateusz.vi 805 
  errflag |= _dos_close(fd);
1330 mateusz.vi 806 
 
1332 mateusz.vi 807 
  return(errflag);
1311 mateusz.vi 808 
}
809 
 
810 
 
1327 mateusz.vi 811 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1340 mateusz.vi 812 
  if (curline_resize(db, db->cursor->len + len) == 0) {
1317 mateusz.vi 813 
    unsigned short off = db->xoffset + db->cursorposx;
1393 mateusz.vi 814 
    db->modflag = 1;
1317 mateusz.vi 815 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
816 
    db->cursor->len += len;
1327 mateusz.vi 817 
    uidirty.from = db->cursorposy;
818 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 819 
    while (len--) {
820 
      db->cursor->payload[off++] = *databuf;
821 
      databuf++;
1327 mateusz.vi 822 
      cursor_right(db);
1317 mateusz.vi 823 
    }
824 
  }
825 
}
826 
 
827 
 
1343 mateusz.vi 828 
/* recompute db->curline by counting nodes in linked list */
829 
static void recompute_curline(struct file *db) {
830 
  const struct line far *l = db->cursor;
831 
 
832 
  db->curline = 0;
833 
  while (l->prev != NULL) {
834 
    db->curline += 1;
835 
    l = l->prev;
836 
  }
837 
}
838 
 
839 
 
1354 mateusz.vi 840 
enum MENU_ACTION {
1393 mateusz.vi 841 
  MENU_NONE   = 0,
842 
  MENU_OPEN   = 1,
843 
  MENU_SAVE   = 2,
844 
  MENU_SAVEAS = 3,
845 
  MENU_CLOSE  = 4,
846 
  MENU_CHGEOL = 5,
1418 mateusz.vi 847 
  MENU_QUIT   = 6
1354 mateusz.vi 848 
};
849 
 
850 
static enum MENU_ACTION ui_menu(void) {
851 
  unsigned short i, curchoice, attr, x, slen;
1393 mateusz.vi 852 
  unsigned short xorigin, yorigin;
1354 mateusz.vi 853 
 
854 
  /* find out the longest string */
855 
  slen = 0;
1355 mateusz.vi 856 
  for (i = MENU_OPEN; i <= MENU_QUIT; i++) {
1354 mateusz.vi 857 
    x = strlen(svarlang_str(8, i));
858 
    if (x > slen) slen = x;
859 
  }
860 
 
1393 mateusz.vi 861 
  /* calculate where to draw the menu on screen */
862 
  xorigin = (screenw - (slen + 5)) / 2;
1395 mateusz.vi 863 
  yorigin = (screenh - (MENU_QUIT - MENU_OPEN + 6)) / 2;
1393 mateusz.vi 864 
 
1395 mateusz.vi 865 
  /* */
866 
  uidirty.from = yorigin;
867 
  uidirty.to = 0xff;
868 
  uidirty.statusbar = 1;
869 
 
870 
  /* hide the cursor */
871 
  mdr_cout_cursor_hide();
872 
 
1355 mateusz.vi 873 
  curchoice = MENU_OPEN;
1354 mateusz.vi 874 
  for (;;) {
875 
    /* render menu */
1393 mateusz.vi 876 
    for (i = MENU_NONE; i <= MENU_QUIT + 1; i++) {
877 
      mdr_cout_char_rep(yorigin + i, xorigin, ' ', SCHEME_MENU, slen+4);
1354 mateusz.vi 878 
      if (i == curchoice) {
879 
        attr = SCHEME_MENU_CUR;
1415 mateusz.vi 880 
        mdr_cout_char_rep(yorigin + i, xorigin + 1, ' ', SCHEME_MENU_SEL, slen + 2);
1354 mateusz.vi 881 
      } else {
882 
        attr = SCHEME_MENU;
883 
      }
1416 mateusz.vi 884 
      mdr_cout_str(yorigin + i, xorigin + 2, svarlang_str(8, i), attr, slen);
1354 mateusz.vi 885 
    }
886 
    /* wait for key */
1410 mateusz.vi 887 
    switch (mdr_dos_getkey2()) {
1354 mateusz.vi 888 
      case 0x150: /* down */
889 
        if (curchoice == MENU_QUIT) {
1355 mateusz.vi 890 
          curchoice = MENU_OPEN;
1354 mateusz.vi 891 
        } else {
892 
          curchoice++;
893 
        }
894 
        break;
895 
      case 0x148: /* up */
1355 mateusz.vi 896 
        if (curchoice == MENU_OPEN) {
1354 mateusz.vi 897 
          curchoice = MENU_QUIT;
898 
        } else {
899 
          curchoice--;
900 
        }
901 
        break;
1395 mateusz.vi 902 
      default:
903 
        curchoice = MENU_NONE;
904 
        /* FALLTHRU */
905 
      case '\r': /* ENTER */
906 
        mdr_cout_cursor_show();
907 
        return(curchoice);
1354 mateusz.vi 908 
    }
909 
  }
910 
}
911 
 
912 
 
1426 mateusz.vi 913 
static struct file *select_slot(struct file *dbarr, unsigned char curfile) {
1355 mateusz.vi 914 
  uidirty.from = 0;
915 
  uidirty.to = 0xff;
916 
  uidirty.statusbar = 1;
917 
 
918 
  dbarr = &(dbarr[curfile]);
1415 mateusz.vi 919 
  /* force redraw now, because the main() routine might not if this is exit
920 
   * time and we want to show the user which file has unsaved changes */
1435 mateusz.vi 921 
  ui_statusbar(dbarr, curfile);
1355 mateusz.vi 922 
  ui_refresh(dbarr);
923 
  return(dbarr);
924 
}
925 
 
926 
 
1347 mateusz.vi 927 
/* main returns nothing, ie. sved always exits with a zero exit code
928 
 * (this saves 20 bytes of executable footprint) */
929 
void main(void) {
1355 mateusz.vi 930 
  static struct file dbarr[10];
1426 mateusz.vi 931 
  unsigned char curfile;
1355 mateusz.vi 932 
  struct file *db = dbarr; /* visible file is the first slot by default */
1410 mateusz.vi 933 
  struct line far *clipboard = NULL;
1414 mateusz.vi 934 
  unsigned char original_breakflag;
1275 mateusz.vi 935 
 
1418 mateusz.vi 936 
  { /* load NLS resource */
1364 mateusz.vi 937 
    unsigned short i = 0;
938 
    const char far *selfptr;
939 
    char self[128], lang[8];
940 
    selfptr = mdr_dos_selfexe();
941 
    if (selfptr != NULL) {
942 
      do {
943 
        self[i] = selfptr[i];
944 
      } while (self[i++] != 0);
945 
      svarlang_autoload_exepath(self, mdr_dos_getenv(lang, "LANG", sizeof(lang)));
946 
    }
1307 mateusz.vi 947 
  }
1282 mateusz.vi 948 
 
1355 mateusz.vi 949 
  /* preload all slots with empty files */
950 
  for (curfile = 9;; curfile--) {
1418 mateusz.vi 951 
    loadfile(&(dbarr[curfile]), NULL);
1355 mateusz.vi 952 
    if (curfile == 0) break;
953 
  }
954 
 
1356 mateusz.vi 955 
  /* parse argv (and load files, if any passed on) */
956 
  if (parseargv(dbarr) != 0) return;
1282 mateusz.vi 957 
 
1412 mateusz.vi 958 
  if ((mdr_cout_init(&screenw, &screenh) != 0) && (glob_monomode == 0)) {
1333 mateusz.vi 959 
    /* load color scheme if mdr_cout_init returns a color flag */
960 
    SCHEME_TEXT = 0x17;
1354 mateusz.vi 961 
    SCHEME_MENU = 0x70;
1388 mateusz.vi 962 
    SCHEME_MENU_CUR = 0x6f;
963 
    SCHEME_MENU_SEL = 0x66;
1333 mateusz.vi 964 
    SCHEME_STBAR1 = 0x70;
965 
    SCHEME_STBAR2 = 0x78;
1392 mateusz.vi 966 
    SCHEME_STBAR3 = 0x3f;
1333 mateusz.vi 967 
    SCHEME_SCROLL = 0x70;
1388 mateusz.vi 968 
    SCHEME_MSG = 0x6f;
1333 mateusz.vi 969 
    SCHEME_ERR = 0x4f;
970 
  }
1427 mateusz.vi 971 
  screenlastrow = screenh - 1;
972 
  screenlastcol = screenw - 1;
1275 mateusz.vi 973 
 
1414 mateusz.vi 974 
  /* instruct DOS to stop detecting CTRL+C because user needs it for
975 
   * copy/paste operations. also remember the original status of the BREAK
976 
   * flag so I can restore it as it was before quitting. */
977 
  original_breakflag = mdr_dos_ctrlc_disable();
1410 mateusz.vi 978 
 
1275 mateusz.vi 979 
  for (;;) {
980 
    int k;
981 
 
1362 mateusz.vi 982 
    /* add an extra empty line if cursor is on last line and this line is not empty */
983 
    if ((db->cursor->next == NULL) && (db->cursor->len != 0)) {
984 
      if (line_add(db, NULL, 0) == 0) {
985 
        db->cursor = db->cursor->prev; /* line_add() changes the cursor pointer */
1437 mateusz.vi 986 
        db->curline -= 1;
1362 mateusz.vi 987 
      }
988 
    }
989 
 
1327 mateusz.vi 990 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 991 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 992 
 
1392 mateusz.vi 993 
    ui_refresh(db);
994 
 
1436 mateusz.vi 995 
    if ((uidirty.statusbar != 0) || (db->modflagprev != db->modflag) || (db->curline_prev != db->curline)) {
1435 mateusz.vi 996 
      ui_statusbar(db, curfile);
1342 mateusz.vi 997 
      uidirty.statusbar = 0;
1355 mateusz.vi 998 
      db->modflagprev = db->modflag;
1436 mateusz.vi 999 
      db->curline_prev = db->curline;
1342 mateusz.vi 1000 
    }
1328 mateusz.vi 1001 
#ifdef DBG_LINENUM
1002 
      {
1003 
        char ddd[10];
1004 
        db->curline += 1;
1005 
        ddd[0] = '0' + db->curline / 100;
1006 
        ddd[1] = '0' + (db->curline % 100) / 10;
1007 
        ddd[2] = '0' + (db->curline % 10);
1008 
        db->curline -= 1;
1009 
        ddd[3] = '/';
1010 
        ddd[4] = '0' + db->totlines / 100;
1011 
        ddd[5] = '0' + (db->totlines % 100) / 10;
1012 
        ddd[6] = '0' + (db->totlines % 10);
1013 
        ddd[7] = 0;
1333 mateusz.vi 1014 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 1015 
      }
1016 
#endif
1275 mateusz.vi 1017 
 
1410 mateusz.vi 1018 
    k = mdr_dos_getkey2();
1282 mateusz.vi 1019 
 
1275 mateusz.vi 1020 
    if (k == 0x150) { /* down */
1327 mateusz.vi 1021 
      cursor_down(db);
1275 mateusz.vi 1022 
 
1023 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 1024 
      cursor_up(db);
1275 mateusz.vi 1025 
 
1026 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 1027 
      cursor_right(db);
1275 mateusz.vi 1028 
 
1029 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 1030 
      cursor_left(db);
1275 mateusz.vi 1031 
 
1282 mateusz.vi 1032 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 1033 
      unsigned char dist = db->cursorposy + screenh - 1;
1034 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
1035 
        db->cursor = db->cursor->prev;
1036 
        dist--;
1037 
      }
1038 
      if (dist != 0) {
1039 
        db->cursorposy = 0;
1040 
        db->cursorposx = 0;
1041 
      } else {
1042 
        dist = db->cursorposy;
1043 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
1044 
      }
1045 
      uidirty.from = 0;
1046 
      uidirty.to = 0xff;
1343 mateusz.vi 1047 
      recompute_curline(db);
1282 mateusz.vi 1048 
 
1049 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 1050 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
1051 
      while ((dist != 0) && (db->cursor->next != NULL)) {
1052 
        db->cursor = db->cursor->next;
1053 
        dist--;
1054 
      }
1055 
      if (dist != 0) {
1056 
        db->cursorposy = screenh - 2;
1057 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
1058 
        db->cursorposx = 0;
1059 
      } else {
1060 
        dist = screenh - 2 - db->cursorposy;
1061 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
1062 
      }
1063 
      uidirty.from = 0;
1064 
      uidirty.to = 0xff;
1343 mateusz.vi 1065 
      recompute_curline(db);
1282 mateusz.vi 1066 
 
1067 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 1068 
       cursor_home(db);
1282 mateusz.vi 1069 
 
1070 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 1071 
       cursor_eol(db);
1282 mateusz.vi 1072 
 
1275 mateusz.vi 1073 
    } else if (k == 0x1B) { /* ESC */
1354 mateusz.vi 1074 
      int quitnow = 0;
1394 mateusz.vi 1075 
      char fname[64];
1354 mateusz.vi 1076 
      int saveflag = 0;
1393 mateusz.vi 1077 
      enum MENU_ACTION ui_action;
1275 mateusz.vi 1078 
 
1392 mateusz.vi 1079 
      /* collect the exact menu action and clear the screen */
1080 
      ui_action = ui_menu();
1081 
      ui_refresh(db);
1354 mateusz.vi 1082 
 
1392 mateusz.vi 1083 
      switch (ui_action) {
1084 
 
1354 mateusz.vi 1085 
        case MENU_NONE:
1086 
          break;
1087 
 
1088 
        case MENU_OPEN:
1089 
          /* display a warning if unsaved changes are pending */
1090 
          if (db->modflag != 0) ui_msg(svarlang_str(0,4), svarlang_str(0,8), SCHEME_MSG);
1091 
 
1092 
          /* ask for filename */
1093 
          ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
1094 
          if (fname[0] != 0) {
1449 mateusz.vi 1095 
            unsigned char err;
1354 mateusz.vi 1096 
            err = loadfile(db, fname);
1097 
            if (err != 0) {
1450 mateusz.vi 1098 
              if (err == LOADFILE_FILENOTFOUND) {
1354 mateusz.vi 1099 
                ui_msg(svarlang_str(0,11), NULL, SCHEME_ERR); /* file not found */
1100 
              } else {
1101 
                ui_msg(svarlang_str(0,10), NULL, SCHEME_ERR);  /* ERROR */
1102 
              }
1103 
              mdr_bios_tickswait(44); /* 3s */
1418 mateusz.vi 1104 
              loadfile(db, NULL);
1354 mateusz.vi 1105 
            }
1106 
          }
1393 mateusz.vi 1107 
          uidirty.from = 0;
1108 
          uidirty.to = 0xff;
1109 
          uidirty.statusbar = 1;
1354 mateusz.vi 1110 
          break;
1111 
 
1112 
        case MENU_SAVEAS:
1113 
          saveflag = 1;
1114 
          /* FALLTHRU */
1115 
        case MENU_SAVE:
1116 
          if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
1117 
            ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
1118 
            if (*fname == 0) break;
1119 
            saveflag = savefile(db, fname);
1444 mateusz.vi 1120 
            if (saveflag == 0) mdr_dos_truename(db->fname, fname);
1354 mateusz.vi 1121 
          } else {
1122 
            saveflag = savefile(db, NULL);
1123 
          }
1124 
 
1395 mateusz.vi 1125 
          mdr_cout_cursor_hide();
1126 
 
1354 mateusz.vi 1127 
          if (saveflag == 0) {
1128 
            db->modflag = 0;
1129 
            ui_msg(svarlang_str(0, 2), NULL, SCHEME_MSG);
1130 
            mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
1131 
          } else {
1429 mateusz.vi 1132 
            ui_msg(svarlang_str(0, 10), NULL, SCHEME_ERR);
1354 mateusz.vi 1133 
            mdr_bios_tickswait(36); /* 2s */
1134 
          }
1395 mateusz.vi 1135 
          mdr_cout_cursor_show();
1354 mateusz.vi 1136 
          break;
1137 
 
1355 mateusz.vi 1138 
        case MENU_CLOSE:
1139 
          if (ui_confirm_if_unsaved(db) == 0) {
1418 mateusz.vi 1140 
            loadfile(db, NULL);
1355 mateusz.vi 1141 
          }
1142 
          uidirty.from = 0;
1143 
          uidirty.to = 0xff;
1144 
          uidirty.statusbar = 1;
1145 
          break;
1146 
 
1354 mateusz.vi 1147 
        case MENU_CHGEOL:
1393 mateusz.vi 1148 
          db->modflag = 1;
1354 mateusz.vi 1149 
          db->lfonly ^= 1;
1150 
          break;
1151 
 
1152 
        case MENU_QUIT:
1355 mateusz.vi 1153 
          quitnow = 1;
1154 
          for (curfile = 0; curfile < 10; curfile++) {
1155 
            if (dbarr[curfile].modflag) {
1156 
              db = select_slot(dbarr, curfile);
1441 mateusz.vi 1157 
              if (ui_confirm_if_unsaved(db) != 0) {
1158 
                quitnow = 0;
1159 
                break;
1160 
              }
1355 mateusz.vi 1161 
            }
1162 
          }
1354 mateusz.vi 1163 
          break;
1164 
      }
1165 
 
1166 
      if (quitnow) break;
1167 
 
1289 mateusz.vi 1168 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 1169 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 1170 
      /* add a new line */
1328 mateusz.vi 1171 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1393 mateusz.vi 1172 
        db->modflag = 1;
1328 mateusz.vi 1173 
        db->cursor = db->cursor->prev; /* back to original line */
1427 mateusz.vi 1174 
        db->curline -= 1;
1289 mateusz.vi 1175 
        /* trim the line above */
1328 mateusz.vi 1176 
        db->cursor->len = off;
1289 mateusz.vi 1177 
        /* move cursor to the (new) line below */
1328 mateusz.vi 1178 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 1179 
        uidirty.to = 0xff;
1328 mateusz.vi 1180 
        cursor_down(db);
1181 
        cursor_home(db);
1289 mateusz.vi 1182 
      } else {
1183 
        /* ERROR: OUT OF MEMORY */
1184 
      }
1185 
 
1292 mateusz.vi 1186 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 1187 
      del(db);
1292 mateusz.vi 1188 
 
1302 mateusz.vi 1189 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 1190 
      bkspc(db);
1302 mateusz.vi 1191 
 
1308 mateusz.vi 1192 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 1193 
      char c = k;
1327 mateusz.vi 1194 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 1195 
 
1317 mateusz.vi 1196 
    } else if (k == 0x009) { /* TAB */
1412 mateusz.vi 1197 
      if (glob_tablessmode == 0) {
1198 
        insert_in_line(db, "        ", 8);
1199 
      } else {
1200 
        insert_in_line(db, "\t", 1);
1201 
      }
1317 mateusz.vi 1202 
 
1355 mateusz.vi 1203 
    } else if ((k >= 0x13b) && (k <= 0x144)) { /* F1..F10 */
1204 
      curfile = k - 0x13b;
1205 
      db = select_slot(dbarr, curfile);
1309 mateusz.vi 1206 
 
1325 mateusz.vi 1207 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
1208 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
1209 
      for (;;) {
1210 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
1211 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 1212 
        cursor_right(db);
1325 mateusz.vi 1213 
      }
1214 
      /* now skip to next non-space or end of file */
1215 
      for (;;) {
1327 mateusz.vi 1216 
        cursor_right(db);
1325 mateusz.vi 1217 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1218 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
1219 
      }
1220 
 
1221 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 1222 
      cursor_left(db);
1325 mateusz.vi 1223 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
1224 
      for (;;) {
1225 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
1226 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 1227 
        cursor_left(db);
1325 mateusz.vi 1228 
      }
1229 
      /* now skip to next space or start of file */
1230 
      for (;;) {
1327 mateusz.vi 1231 
        cursor_left(db);
1325 mateusz.vi 1232 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 1233 
          cursor_right(db);
1325 mateusz.vi 1234 
          break;
1235 
        }
1236 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
1237 
      }
1238 
 
1410 mateusz.vi 1239 
    } else if ((k == 0x003) || (k == 0x018)) { /* CTRL+C or CTRL+X */
1240 
      /* free clipboard if anything in it */
1241 
      if (clipboard != NULL) line_free(clipboard);
1242 
 
1243 
      /* copy cursor line to clipboard */
1244 
      clipboard = line_calloc(db->cursor->len);
1245 
      if (clipboard == NULL) {
1246 
        ui_msg(svarlang_str(0, 10), NULL, SCHEME_ERR); /* ERROR */
1247 
        mdr_bios_tickswait(18); /* 1s */
1248 
      } else {
1427 mateusz.vi 1249 
        mdr_cout_char_rep(db->cursorposy, 0, ' ', ((SCHEME_TEXT >> 4) | (SCHEME_TEXT << 4)) & 0xff, screenlastcol);
1410 mateusz.vi 1250 
        uidirty.from = db->cursorposy;
1251 
        uidirty.to = db->cursorposy;
1252 
        if (db->cursor->len != 0) {
1253 
          _fmemmove(clipboard->payload, db->cursor->payload, db->cursor->len);
1254 
          clipboard->len = db->cursor->len;
1255 
        }
1256 
        mdr_bios_tickswait(2); /* ca 100ms */
1257 
 
1258 
        /* if this is about cutting the line (CTRL+X) then delete cur line */
1259 
        if ((k == 0x018) && ((db->cursor->next != NULL) || (db->cursor->prev != NULL))) {
1260 
          if (db->cursor->next) db->cursor->next->prev = db->cursor->prev;
1261 
          if (db->cursor->prev) db->cursor->prev->next = db->cursor->next;
1262 
          clipboard->prev = db->cursor;
1263 
          if (db->cursor->next) {
1264 
            db->cursor = db->cursor->next;
1265 
          } else {
1266 
            cursor_up(db);
1267 
          }
1268 
          line_free(clipboard->prev);
1423 mateusz.vi 1269 
          db->totlines -= 1;
1410 mateusz.vi 1270 
          uidirty.from = 0;
1271 
          uidirty.to = 0xff;
1412 mateusz.vi 1272 
          recompute_curline(db);
1410 mateusz.vi 1273 
        }
1274 
      }
1275 
 
1420 mateusz.vi 1276 
    } else if ((k == 0x016) && (clipboard != NULL)) { /* CTRL+V */
1277 
      if (line_add(db, clipboard->payload, clipboard->len) != 0) {
1278 
        ui_msg(svarlang_str(0, 10), NULL, SCHEME_ERR); /* ERROR */
1279 
        mdr_bios_tickswait(18); /* 1s */
1280 
      } else {
1281 
        /* rewire the linked list so the new line is on top of the previous one */
1282 
        clipboard->prev = db->cursor->prev;
1283 
        /* remove prev node from list */
1284 
        db->cursor->prev = db->cursor->prev->prev;
1285 
        if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor;
1286 
        /* insert the node after cursor now */
1287 
        clipboard->prev->next = db->cursor->next;
1288 
        if (db->cursor->next != NULL) db->cursor->next->prev = clipboard->prev;
1289 
        clipboard->prev->prev = db->cursor;
1290 
        db->cursor->next = clipboard->prev;
1291 
        cursor_down(db);
1410 mateusz.vi 1292 
      }
1293 
      uidirty.from = 0;
1294 
      uidirty.to = 0xff;
1412 mateusz.vi 1295 
      recompute_curline(db);
1410 mateusz.vi 1296 
 
1333 mateusz.vi 1297 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 1298 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
1299 
      char buff[4];
1300 
      const char *HEX = "0123456789ABCDEF";
1301 
      buff[0] = HEX[(k >> 8) & 15];
1302 
      buff[1] = HEX[(k >> 4) & 15];
1303 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 1304 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
1305 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1410 mateusz.vi 1306 
      mdr_dos_getkey2();
1275 mateusz.vi 1307 
      break;
1333 mateusz.vi 1308 
#endif
1275 mateusz.vi 1309 
    }
1310 
  }
1311 
 
1312 
  mdr_cout_close();
1313 
 
1414 mateusz.vi 1314 
  /* restore the DOS BREAK flag if it was originally set */
1315 
  if (original_breakflag != 0) mdr_dos_ctrlc_enable();
1316 
 
1320 mateusz.vi 1317 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 1318 
 
1347 mateusz.vi 1319 
  return;
1275 mateusz.vi 1320 
}