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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;
1330 mateusz.vi 81 
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
82 
  char modflag;  /* non-zero if file has been modified since last save */
1355 mateusz.vi 83 
  char modflagprev;
1332 mateusz.vi 84 
  char fname[128];
1275 mateusz.vi 85 
};
86 
 
87 
 
1326 mateusz.vi 88 
/*****************************************************************************
89 
 * functions                                                                 *
90 
 *****************************************************************************/
91 
 
1339 mateusz.vi 92 
static struct line far *line_calloc(unsigned short siz) {
1342 mateusz.vi 93 
  struct line far *res;
1339 mateusz.vi 94 
  unsigned int seg;
1341 mateusz.vi 95 
  if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);
1342 mateusz.vi 96 
  res = MK_FP(seg, 0);
97 
  _fmemset(res, 0, sizeof(struct line) + siz);
1339 mateusz.vi 98 
  return(MK_FP(seg, 0));
99 
}
100 
 
101 
 
102 
static void line_free(struct line far *ptr) {
103 
  _dos_freemem(FP_SEG(ptr));
104 
}
105 
 
106 
 
1348 mateusz.vi 107 
static int curline_resize(struct file far *db, unsigned short newsiz) {
1339 mateusz.vi 108 
  unsigned int maxavail;
109 
  struct line far *newptr;
110 
 
1341 mateusz.vi 111 
  /* try resizing the block (much faster) */
112 
  if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);
1339 mateusz.vi 113 
 
114 
  /* create a new block and copy data over */
115 
  newptr = line_calloc(newsiz);
1340 mateusz.vi 116 
  if (newptr == NULL) return(-1);
117 
  _fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
118 
 
119 
  /* rewire the linked list */
120 
  db->cursor = newptr;
121 
  if (newptr->next) newptr->next->prev = newptr;
122 
  if (newptr->prev) newptr->prev->next = newptr;
123 
 
124 
  return(0);
1339 mateusz.vi 125 
}
126 
 
127 
 
1328 mateusz.vi 128 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 129 
 * returns non-zero on error */
1328 mateusz.vi 130 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 131 
  struct line far *l;
1275 mateusz.vi 132 
 
1339 mateusz.vi 133 
  l = line_calloc(slen);
1287 mateusz.vi 134 
  if (l == NULL) return(-1);
135 
 
1275 mateusz.vi 136 
  l->prev = db->cursor;
137 
  if (db->cursor) {
138 
    l->next = db->cursor->next;
139 
    db->cursor->next = l;
140 
    l->next->prev = l;
141 
  }
142 
  db->cursor = l;
1342 mateusz.vi 143 
  if (slen > 0) {
144 
    _fmemmove(l->payload, line, slen);
145 
    l->len = slen;
146 
  }
1287 mateusz.vi 147 
 
1328 mateusz.vi 148 
  db->totlines += 1;
149 
  db->curline += 1;
150 
 
1287 mateusz.vi 151 
  return(0);
1275 mateusz.vi 152 
}
153 
 
154 
 
1348 mateusz.vi 155 
static void ui_getstring(const char *query, char *s, unsigned short maxlen) {
156 
  unsigned short len = 0;
157 
  unsigned char y, x;
1332 mateusz.vi 158 
  int k;
159 
 
160 
  if (maxlen == 0) return;
161 
  maxlen--; /* make room for the nul terminator */
162 
 
1427 mateusz.vi 163 
  y = screenlastrow;
1332 mateusz.vi 164 
 
165 
  /* print query string */
1333 mateusz.vi 166 
  x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);
167 
  mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 168 
 
169 
  for (;;) {
170 
    mdr_cout_locate(y, x + len);
1410 mateusz.vi 171 
    k = mdr_dos_getkey2();
1332 mateusz.vi 172 
 
1345 mateusz.vi 173 
    switch (k) {
174 
      case 0x1b: /* ESC */
175 
        s[0] = 0;
176 
        return;
177 
      case '\r':
178 
        s[len] = 0;
179 
        return;
180 
      case 0x08: /* BKSPC */
181 
        if (len > 0) {
182 
          len--;
183 
          mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);
184 
        }
185 
        break;
186 
      default:
187 
        if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
188 
          mdr_cout_char(y, x + len, k, SCHEME_STBAR3);
189 
          s[len++] = k;
190 
        }
1332 mateusz.vi 191 
    }
1345 mateusz.vi 192 
  }
1332 mateusz.vi 193 
 
194 
}
195 
 
196 
 
1324 mateusz.vi 197 
/* append a nul-terminated string to line at cursor position */
198 
static int line_append(struct file *f, const char far *buf, unsigned short len) {
1427 mateusz.vi 199 
  if (sizeof(struct line) + f->cursor->len + len < len) goto ERR; /* overflow check */
200 
  if (curline_resize(f, f->cursor->len + len) != 0) goto ERR;
201 
 
1337 mateusz.vi 202 
  _fmemmove(f->cursor->payload + f->cursor->len, buf, len);
1324 mateusz.vi 203 
  f->cursor->len += len;
204 
 
205 
  return(0);
1427 mateusz.vi 206 
  ERR:
207 
  return(-1);
1324 mateusz.vi 208 
}
209 
 
210 
 
1315 mateusz.vi 211 
static void db_rewind(struct file *db) {
1275 mateusz.vi 212 
  if (db->cursor == NULL) return;
213 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 214 
  db->curline = 0;
1275 mateusz.vi 215 
}
216 
 
217 
 
1426 mateusz.vi 218 
static void ui_basic(const struct file *db, unsigned char slotnum) {
1356 mateusz.vi 219 
  const char *s = svarlang_strid(0); /* ESC=MENU */
1348 mateusz.vi 220 
  unsigned short helpcol = screenw - strlen(s);
1394 mateusz.vi 221 
  unsigned short maxfnlen = helpcol - 14;
1275 mateusz.vi 222 
 
1425 mateusz.vi 223 
  /* slot number (guaranteed to be 0-9) */
1355 mateusz.vi 224 
  {
225 
    char slot[4] = "#00";
1425 mateusz.vi 226 
    if (slotnum == 9) {
227 
      slot[1] = '1';
228 
    } else {
229 
      slotnum++;
230 
      slot[2] += slotnum;
231 
    }
1427 mateusz.vi 232 
    mdr_cout_str(screenlastrow, 0, slot, SCHEME_STBAR2, 3);
1355 mateusz.vi 233 
  }
1313 mateusz.vi 234 
 
1355 mateusz.vi 235 
  /* fill rest of status bar with background */
1427 mateusz.vi 236 
  mdr_cout_char_rep(screenlastrow, 3, ' ', SCHEME_STBAR1, helpcol - 3);
1355 mateusz.vi 237 
 
1393 mateusz.vi 238 
  /* filename and modflag */
1330 mateusz.vi 239 
  {
1394 mateusz.vi 240 
    const char *fn;
1355 mateusz.vi 241 
    unsigned short x;
1394 mateusz.vi 242 
    if (db->fname[0] == 0) {
243 
      fn = svarlang_str(0, 1); /* "UNTITLED" */
244 
    } else {
245 
      /* display filename up to maxfnlen chars */
246 
      fn = db->fname;
247 
      x = strlen(fn);
248 
      if (x > maxfnlen) fn += x - maxfnlen;
249 
    }
1427 mateusz.vi 250 
    x = mdr_cout_str(screenlastrow, 4, fn, SCHEME_STBAR1, maxfnlen);
251 
    if (db->modflag) mdr_cout_char(screenlastrow, 5 + x, '!', SCHEME_STBAR2);
1321 mateusz.vi 252 
  }
1313 mateusz.vi 253 
 
254 
  /* eol type */
1330 mateusz.vi 255 
  {
256 
    const char *eoltype = "CRLF";
1353 mateusz.vi 257 
    if (db->lfonly) eoltype += 2;
1427 mateusz.vi 258 
    mdr_cout_str(screenlastrow, helpcol - 6, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 259 
  }
1313 mateusz.vi 260 
 
1427 mateusz.vi 261 
  mdr_cout_str(screenlastrow, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 262 
}
263 
 
264 
 
1331 mateusz.vi 265 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
1312 mateusz.vi 266 
  unsigned short x, y, msglen, i;
1428 mateusz.vi 267 
  unsigned short msg2flag = 0;
1331 mateusz.vi 268 
 
269 
  msglen = strlen(msg1);
270 
  if (msg2) {
271 
    msg2flag = 1;
272 
    i = strlen(msg2);
273 
    if (i > msglen) msglen = i;
274 
  }
275 
 
276 
  y = (screenh - 6) >> 1;
1312 mateusz.vi 277 
  x = (screenw - msglen - 4) >> 1;
1331 mateusz.vi 278 
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
279 
  x++;
1345 mateusz.vi 280 
 
1331 mateusz.vi 281 
  mdr_cout_str(y+1, x, msg1, attr, msglen);
282 
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
1312 mateusz.vi 283 
 
1327 mateusz.vi 284 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 285 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 286 
}
287 
 
288 
 
1412 mateusz.vi 289 
static unsigned char ui_confirm_if_unsaved(const struct file *db) {
1355 mateusz.vi 290 
  unsigned char r = 0;
1342 mateusz.vi 291 
  if (db->modflag == 0) return(0);
292 
 
1355 mateusz.vi 293 
  mdr_cout_cursor_hide();
294 
 
1342 mateusz.vi 295 
  /* if file has been modified then ask for confirmation */
296 
  ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);
1410 mateusz.vi 297 
  if (mdr_dos_getkey2() != '\r') r = 1;
1342 mateusz.vi 298 
 
1355 mateusz.vi 299 
  mdr_cout_cursor_show();
300 
 
301 
  return(r);
1342 mateusz.vi 302 
}
303 
 
304 
 
1327 mateusz.vi 305 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 306 
  unsigned char x;
1310 mateusz.vi 307 
  const struct line far *l;
1316 mateusz.vi 308 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 309 
 
1392 mateusz.vi 310 
  /* quit early if nothing to refresh */
311 
  if (uidirty.from == 0xff) return;
312 
 
1288 mateusz.vi 313 
#ifdef DBG_REFRESH
1282 mateusz.vi 314 
  static char m = 'a';
315 
  m++;
316 
  if (m > 'z') m = 'a';
1288 mateusz.vi 317 
#endif
1282 mateusz.vi 318 
 
1310 mateusz.vi 319 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 320 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 321 
 
1310 mateusz.vi 322 
  /* iterate over lines and redraw whatever needs to be redrawn */
323 
  for (; l != NULL; l = l->next, y++) {
324 
 
325 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 326 
    if (y < uidirty.from) continue;
327 
    if (y > uidirty.to) break;
1282 mateusz.vi 328 
 
1318 mateusz.vi 329 
    x = 0;
1275 mateusz.vi 330 
    if (db->xoffset < l->len) {
1318 mateusz.vi 331 
      unsigned char i, limit;
332 
      if (l->len - db->xoffset < screenw) {
333 
        limit = l->len;
334 
      } else {
1427 mateusz.vi 335 
        limit = db->xoffset + screenlastcol;
1318 mateusz.vi 336 
      }
1333 mateusz.vi 337 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 338 
    }
1282 mateusz.vi 339 
 
1318 mateusz.vi 340 
    /* write empty spaces until end of line */
1427 mateusz.vi 341 
    if (x < screenlastcol) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenlastcol - x);
1318 mateusz.vi 342 
 
1288 mateusz.vi 343 
#ifdef DBG_REFRESH
1333 mateusz.vi 344 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 345 
#endif
1282 mateusz.vi 346 
 
1275 mateusz.vi 347 
    if (y == screenh - 2) break;
348 
  }
1310 mateusz.vi 349 
 
1319 mateusz.vi 350 
  /* fill all lines below if empty (and they need to be redrawn) */
351 
  if (l == NULL) {
1427 mateusz.vi 352 
    while ((y < screenlastrow) && (y < uidirty.to)) {
353 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenlastcol);
1319 mateusz.vi 354 
    }
1318 mateusz.vi 355 
  }
1328 mateusz.vi 356 
 
357 
  /* scroll bar */
1427 mateusz.vi 358 
  for (y = 0; y < screenlastrow; y++) {
359 
    mdr_cout_char(y, screenlastcol, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 360 
  }
361 
 
362 
  /* scroll cursor */
363 
  if (db->totlines >= screenh) {
364 
    unsigned short topline = db->curline - db->cursorposy;
365 
    unsigned short col;
366 
    unsigned short totlines = db->totlines - screenh + 1;
367 
    if (db->totlines - screenh > screenh) {
1427 mateusz.vi 368 
      col = topline / (totlines / screenlastrow);
1328 mateusz.vi 369 
    } else {
1427 mateusz.vi 370 
      col = topline * screenlastrow / totlines;
1328 mateusz.vi 371 
    }
1427 mateusz.vi 372 
    if (col >= screenlastrow) col = screenh - 2;
373 
    mdr_cout_char(col, screenlastcol, ' ', SCHEME_SCROLL);
1328 mateusz.vi 374 
  }
1392 mateusz.vi 375 
 
376 
  /* clear out the dirty flag */
377 
  uidirty.from = 0xff;
1275 mateusz.vi 378 
}
379 
 
380 
 
1327 mateusz.vi 381 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 382 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 383 
 
384 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 385 
    db->cursorposx = 0;
1275 mateusz.vi 386 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 387 
    uidirty.from = 0;
388 
    uidirty.to = 0xff;
1275 mateusz.vi 389 
  } else {
1316 mateusz.vi 390 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 391 
  }
392 
}
393 
 
394 
 
1327 mateusz.vi 395 
static void cursor_up(struct file *db) {
1422 mateusz.vi 396 
  if (db->cursor->prev == NULL) return;
397 
 
398 
  db->curline -= 1;
399 
  db->cursor = db->cursor->prev;
400 
  if (db->cursorposy == 0) {
401 
    uidirty.from = 0;
402 
    uidirty.to = 0xff;
403 
  } else {
404 
    db->cursorposy -= 1;
1275 mateusz.vi 405 
  }
406 
}
407 
 
408 
 
1327 mateusz.vi 409 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 410 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 411 
  if (db->xoffset > db->cursor->len) {
412 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 413 
    uidirty.from = 0;
414 
    uidirty.to = 0xff;
1282 mateusz.vi 415 
  }
416 
 
1427 mateusz.vi 417 
  if (db->xoffset + screenlastcol <= db->cursor->len) {
1282 mateusz.vi 418 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 419 
    uidirty.from = 0;
420 
    uidirty.to = 0xff;
1282 mateusz.vi 421 
  }
1316 mateusz.vi 422 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 423 
}
424 
 
425 
 
1327 mateusz.vi 426 
static void cursor_down(struct file *db) {
1422 mateusz.vi 427 
  if (db->cursor->next == NULL) return;
428 
 
429 
  db->curline += 1;
430 
  db->cursor = db->cursor->next;
431 
  if (db->cursorposy < screenh - 2) {
432 
    db->cursorposy += 1;
433 
  } else {
434 
    uidirty.from = 0;
435 
    uidirty.to = 0xff;
1276 mateusz.vi 436 
  }
437 
}
438 
 
439 
 
1327 mateusz.vi 440 
static void cursor_left(struct file *db) {
1316 mateusz.vi 441 
  if (db->cursorposx > 0) {
442 
    db->cursorposx -= 1;
1302 mateusz.vi 443 
  } else if (db->xoffset > 0) {
444 
    db->xoffset -= 1;
1327 mateusz.vi 445 
    uidirty.from = 0;
446 
    uidirty.to = 0xff;
1302 mateusz.vi 447 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 448 
    cursor_up(db);
449 
    cursor_eol(db);
1302 mateusz.vi 450 
  }
451 
}
452 
 
453 
 
1327 mateusz.vi 454 
static void cursor_home(struct file *db) {
1316 mateusz.vi 455 
  db->cursorposx = 0;
1282 mateusz.vi 456 
  if (db->xoffset != 0) {
457 
    db->xoffset = 0;
1327 mateusz.vi 458 
    uidirty.from = 0;
459 
    uidirty.to = 0xff;
1282 mateusz.vi 460 
  }
1276 mateusz.vi 461 
}
462 
 
463 
 
1327 mateusz.vi 464 
static void cursor_right(struct file *db) {
1316 mateusz.vi 465 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
466 
    if (db->cursorposx < screenw - 2) {
467 
      db->cursorposx += 1;
1308 mateusz.vi 468 
    } else {
469 
      db->xoffset += 1;
1327 mateusz.vi 470 
      uidirty.from = 0;
471 
      uidirty.to = 0xff;
1308 mateusz.vi 472 
    }
1357 mateusz.vi 473 
  } else if (db->cursor->next != NULL) { /* jump to start of next line */
1327 mateusz.vi 474 
    cursor_down(db);
475 
    cursor_home(db);
1308 mateusz.vi 476 
  }
477 
}
478 
 
479 
 
1327 mateusz.vi 480 
static void del(struct file *db) {
1316 mateusz.vi 481 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
482 
    _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 483 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 484 
    uidirty.from = db->cursorposy;
485 
    uidirty.to = db->cursorposy;
1393 mateusz.vi 486 
    db->modflag = 1;
1292 mateusz.vi 487 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
488 
    struct line far *nextline = db->cursor->next;
489 
    if (db->cursor->next->len > 0) {
1340 mateusz.vi 490 
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
1337 mateusz.vi 491 
        _fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 492 
        db->cursor->len += db->cursor->next->len;
493 
      }
494 
    }
1340 mateusz.vi 495 
 
1292 mateusz.vi 496 
    db->cursor->next = db->cursor->next->next;
497 
    db->cursor->next->prev = db->cursor;
1340 mateusz.vi 498 
 
1339 mateusz.vi 499 
    line_free(nextline);
1327 mateusz.vi 500 
    uidirty.from = db->cursorposy;
501 
    uidirty.to = 0xff;
1328 mateusz.vi 502 
    db->totlines -= 1;
1393 mateusz.vi 503 
    db->modflag = 1;
1292 mateusz.vi 504 
  }
505 
}
506 
 
507 
 
1327 mateusz.vi 508 
static void bkspc(struct file *db) {
1302 mateusz.vi 509 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1421 mateusz.vi 510 
  if ((db->cursorposx + db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 511 
 
1327 mateusz.vi 512 
  cursor_left(db);
513 
  del(db);
1302 mateusz.vi 514 
}
515 
 
516 
 
1346 mateusz.vi 517 
/* returns 0 on success, 1 on file not found, 2 on other error */
1359 mateusz.vi 518 
static int loadfile(struct file *db, const char *fname) {
1324 mateusz.vi 519 
  char buff[512]; /* read one entire sector at a time (faster) */
520 
  char *buffptr;
521 
  unsigned int len, llen;
1287 mateusz.vi 522 
  int fd;
1324 mateusz.vi 523 
  unsigned char eolfound;
1287 mateusz.vi 524 
 
1355 mateusz.vi 525 
  /* free the entire linked list of lines */
526 
  db_rewind(db);
527 
  while (db->cursor) {
528 
    struct line far *victim;
529 
    victim = db->cursor;
530 
    db->cursor = db->cursor->next;
531 
    line_free(victim);
532 
  }
1321 mateusz.vi 533 
 
1355 mateusz.vi 534 
  /* zero out the struct */
535 
  bzero(db, sizeof(struct file));
536 
 
1418 mateusz.vi 537 
  if (fname == NULL) goto SKIPLOADING;
1321 mateusz.vi 538 
 
1355 mateusz.vi 539 
  memcpy(db->fname, fname, strlen(fname));
540 
 
1287 mateusz.vi 541 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
1346 mateusz.vi 542 
    return(1);
1287 mateusz.vi 543 
  }
544 
 
1313 mateusz.vi 545 
  db->lfonly = 1;
546 
 
1324 mateusz.vi 547 
  /* start by adding an empty line */
1328 mateusz.vi 548 
  if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 549 
    /* TODO ERROR HANDLING */
550 
  }
1287 mateusz.vi 551 
 
1324 mateusz.vi 552 
  for (eolfound = 0;;) {
553 
    unsigned short consumedbytes;
554 
 
555 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
556 
    buffptr = buff;
557 
 
558 
    FINDLINE:
559 
 
1361 mateusz.vi 560 
    /* look for nearest \n (also expand tabs) */
1324 mateusz.vi 561 
    for (consumedbytes = 0;; consumedbytes++) {
1361 mateusz.vi 562 
 
563 
      if (buffptr[consumedbytes] == '\t') {
564 
        llen = consumedbytes;
565 
        break;
566 
      }
567 
 
1324 mateusz.vi 568 
      if (consumedbytes == len) {
569 
        llen = consumedbytes;
570 
        break;
1323 mateusz.vi 571 
      }
1324 mateusz.vi 572 
      if (buffptr[consumedbytes] == '\r') {
573 
        llen = consumedbytes;
574 
        consumedbytes++;
575 
        db->lfonly = 0;
1320 mateusz.vi 576 
        break;
577 
      }
1324 mateusz.vi 578 
      if (buffptr[consumedbytes] == '\n') {
579 
        eolfound = 1;
580 
        llen = consumedbytes;
581 
        consumedbytes++;
582 
        break;
583 
      }
1287 mateusz.vi 584 
    }
1324 mateusz.vi 585 
 
586 
    /* consumedbytes is the amount of bytes processed from buffptr,
587 
     * llen is the length of line's payload (without its line terminator) */
588 
 
589 
    /* append content, if line is non-empty */
590 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1339 mateusz.vi 591 
      goto IOERR;
1287 mateusz.vi 592 
    }
593 
 
1419 mateusz.vi 594 
    /* allocate the next line if current line ended */
1324 mateusz.vi 595 
    if (eolfound) {
1328 mateusz.vi 596 
      if (line_add(db, NULL, 0) != 0) {
1339 mateusz.vi 597 
        goto IOERR;
1324 mateusz.vi 598 
      }
599 
      eolfound = 0;
600 
    }
1287 mateusz.vi 601 
 
1361 mateusz.vi 602 
    /* append 8 spaces if tab char found */
1412 mateusz.vi 603 
    if ((consumedbytes < len) && (buffptr[consumedbytes] == '\t') && (glob_tablessmode == 0)) {
1361 mateusz.vi 604 
      consumedbytes++;
605 
      if (line_append(db, "        ", 8) != 0) {
606 
        goto IOERR;
607 
      }
608 
    }
609 
 
1324 mateusz.vi 610 
    /* anything left? process the buffer leftover again */
611 
    if (consumedbytes < len) {
612 
      len -= consumedbytes;
613 
      buffptr += consumedbytes;
614 
      goto FINDLINE;
615 
    }
616 
 
617 
  }
618 
 
1287 mateusz.vi 619 
  _dos_close(fd);
620 
 
1321 mateusz.vi 621 
  SKIPLOADING:
622 
 
1320 mateusz.vi 623 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
1339 mateusz.vi 624 
  if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
625 
  db_rewind(db);
1320 mateusz.vi 626 
 
1346 mateusz.vi 627 
  return(0);
1339 mateusz.vi 628 
 
629 
  IOERR:
630 
  _dos_close(fd);
1346 mateusz.vi 631 
  return(2);
1287 mateusz.vi 632 
}
633 
 
634 
 
1356 mateusz.vi 635 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
636 
 * of argc and argv, saves some 330 bytes of binary size
637 
 * returns non-zero on error */
638 
static int parseargv(struct file *dbarr) {
639 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
640 
  unsigned short count = 0;
641 
  char *arg;
642 
  unsigned short lastarg = 0;
1359 mateusz.vi 643 
  int err;
1356 mateusz.vi 644 
 
645 
  while (!lastarg) {
646 
    /* jump to nearest arg */
647 
    while (*tail == ' ') {
648 
      *tail = 0;
649 
      tail++;
650 
    }
651 
 
652 
    if (*tail == '\r') {
653 
      *tail = 0;
654 
      break;
655 
    }
656 
 
657 
    arg = tail;
658 
 
659 
    /* jump to next delimiter */
660 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
661 
 
662 
    /* if \r then remember this is the last arg */
663 
    if (*tail == '\r') lastarg = 1;
664 
 
665 
    *tail = 0;
666 
    tail++;
667 
 
668 
    /* look at the arg now */
669 
    if (*arg == '/') {
1412 mateusz.vi 670 
      if (arg[1] == 't') { /* /t = do not expand tabs */
671 
        glob_tablessmode = 1;
672 
 
673 
      } else if (arg[1] == 'm') { /* /m = force mono mode */
674 
        glob_monomode = 1;
675 
 
676 
      } else {  /* help screen */
677 
        const char far *self = mdr_dos_selfexe();
678 
        unsigned short i;
679 
        if (self == NULL) self = "sved";
680 
        for (i = 0; self[i] != 0; i++) {
681 
          if (self[i] == '\\') {
682 
            self += i + 1;
683 
            i = 0;
684 
          }
1387 mateusz.vi 685 
        }
1419 mateusz.vi 686 
        mdr_coutraw_str(svarlang_str(1,3)); /* Sved, the SvarDOS editor */
1412 mateusz.vi 687 
        mdr_coutraw_str(" [");
1419 mateusz.vi 688 
        mdr_coutraw_str(svarlang_str(1,4)); /* ver */
1412 mateusz.vi 689 
        mdr_coutraw_puts(" " PVER "]");
690 
        mdr_coutraw_puts("Copyright (C) " PDATE " Mateusz Viste");
691 
        mdr_coutraw_crlf();
692 
        mdr_coutraw_str(svarlang_str(1,0)); /* usage: */
693 
        mdr_coutraw_char(' ');
694 
        while (*self != 0) {
695 
          mdr_coutraw_char(*self);
696 
          self++;
697 
        }
698 
        mdr_coutraw_char(' ');
699 
        mdr_coutraw_puts(svarlang_str(1,1)); /* args syntax */
700 
        mdr_coutraw_crlf();
701 
        mdr_coutraw_puts(svarlang_str(1,10)); /* /m */
702 
        mdr_coutraw_puts(svarlang_str(1,11)); /* /t */
703 
        return(-1);
1387 mateusz.vi 704 
      }
1412 mateusz.vi 705 
      continue;
1356 mateusz.vi 706 
    }
707 
 
708 
    /* looks to be a filename */
709 
    if (count == 10) {
1420 mateusz.vi 710 
      mdr_coutraw_puts(svarlang_str(0,12)); /* too many files */
711 
      return(-1);
1356 mateusz.vi 712 
    }
713 
 
714 
    /* try loading it */
1387 mateusz.vi 715 
    mdr_coutraw_str(svarlang_str(1,2));
716 
    mdr_coutraw_char(' ');
1356 mateusz.vi 717 
    mdr_coutraw_puts(arg);
718 
    err = loadfile(&(dbarr[count]), arg);
719 
    if (err) {
720 
      if (err == 1) { /* file not found */
1396 mateusz.vi 721 
        if ((count == 0) && (lastarg != 0)) { /* a 'file not found' is fine if only one file was given */
722 
          memcpy(dbarr[count].fname, arg, strlen(arg) + 1);
723 
          err = 0;
724 
        } else {
725 
          err = 11;
726 
        }
1356 mateusz.vi 727 
      } else { /* general error */
728 
        err = 10;
729 
      }
1396 mateusz.vi 730 
      if (err) {
731 
        mdr_coutraw_puts(svarlang_str(0,err));
732 
        return(-1);
733 
      }
1356 mateusz.vi 734 
    }
735 
    count++;
736 
  }
737 
 
738 
  return(0);
739 
}
740 
 
741 
 
1332 mateusz.vi 742 
static int savefile(const struct file *db, const char *newfname) {
1311 mateusz.vi 743 
  int fd;
744 
  const struct line far *l;
1417 mateusz.vi 745 
  unsigned int bytes;
1313 mateusz.vi 746 
  unsigned char eollen;
747 
  unsigned char eolbuf[2];
1332 mateusz.vi 748 
  int errflag = 0;
1313 mateusz.vi 749 
 
1332 mateusz.vi 750 
  /* either create a new file if newfname provided, or... */
751 
  if (newfname) {
752 
    if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
753 
  } else { /* ...open db->fname */
754 
    if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
1311 mateusz.vi 755 
  }
756 
 
757 
  l = db->cursor;
758 
  while (l->prev) l = l->prev;
759 
 
1313 mateusz.vi 760 
  /* preset line terminators */
761 
  if (db->lfonly) {
762 
    eolbuf[0] = '\n';
763 
    eollen = 1;
764 
  } else {
765 
    eolbuf[0] = '\r';
766 
    eolbuf[1] = '\n';
767 
    eollen = 2;
768 
  }
769 
 
1311 mateusz.vi 770 
  while (l) {
1324 mateusz.vi 771 
    /* do not write the last empty line, it is only useful for edition */
772 
    if (l->len != 0) {
1332 mateusz.vi 773 
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
1324 mateusz.vi 774 
    } else if (l->next == NULL) {
775 
      break;
776 
    }
1332 mateusz.vi 777 
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
1311 mateusz.vi 778 
    l = l->next;
779 
  }
780 
 
1332 mateusz.vi 781 
  errflag |= _dos_close(fd);
1330 mateusz.vi 782 
 
1332 mateusz.vi 783 
  return(errflag);
1311 mateusz.vi 784 
}
785 
 
786 
 
1327 mateusz.vi 787 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1340 mateusz.vi 788 
  if (curline_resize(db, db->cursor->len + len) == 0) {
1317 mateusz.vi 789 
    unsigned short off = db->xoffset + db->cursorposx;
1393 mateusz.vi 790 
    db->modflag = 1;
1317 mateusz.vi 791 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
792 
    db->cursor->len += len;
1327 mateusz.vi 793 
    uidirty.from = db->cursorposy;
794 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 795 
    while (len--) {
796 
      db->cursor->payload[off++] = *databuf;
797 
      databuf++;
1327 mateusz.vi 798 
      cursor_right(db);
1317 mateusz.vi 799 
    }
800 
  }
801 
}
802 
 
803 
 
1343 mateusz.vi 804 
/* recompute db->curline by counting nodes in linked list */
805 
static void recompute_curline(struct file *db) {
806 
  const struct line far *l = db->cursor;
807 
 
808 
  db->curline = 0;
809 
  while (l->prev != NULL) {
810 
    db->curline += 1;
811 
    l = l->prev;
812 
  }
813 
}
814 
 
815 
 
1354 mateusz.vi 816 
enum MENU_ACTION {
1393 mateusz.vi 817 
  MENU_NONE   = 0,
818 
  MENU_OPEN   = 1,
819 
  MENU_SAVE   = 2,
820 
  MENU_SAVEAS = 3,
821 
  MENU_CLOSE  = 4,
822 
  MENU_CHGEOL = 5,
1418 mateusz.vi 823 
  MENU_QUIT   = 6
1354 mateusz.vi 824 
};
825 
 
826 
static enum MENU_ACTION ui_menu(void) {
827 
  unsigned short i, curchoice, attr, x, slen;
1393 mateusz.vi 828 
  unsigned short xorigin, yorigin;
1354 mateusz.vi 829 
 
830 
  /* find out the longest string */
831 
  slen = 0;
1355 mateusz.vi 832 
  for (i = MENU_OPEN; i <= MENU_QUIT; i++) {
1354 mateusz.vi 833 
    x = strlen(svarlang_str(8, i));
834 
    if (x > slen) slen = x;
835 
  }
836 
 
1393 mateusz.vi 837 
  /* calculate where to draw the menu on screen */
838 
  xorigin = (screenw - (slen + 5)) / 2;
1395 mateusz.vi 839 
  yorigin = (screenh - (MENU_QUIT - MENU_OPEN + 6)) / 2;
1393 mateusz.vi 840 
 
1395 mateusz.vi 841 
  /* */
842 
  uidirty.from = yorigin;
843 
  uidirty.to = 0xff;
844 
  uidirty.statusbar = 1;
845 
 
846 
  /* hide the cursor */
847 
  mdr_cout_cursor_hide();
848 
 
1355 mateusz.vi 849 
  curchoice = MENU_OPEN;
1354 mateusz.vi 850 
  for (;;) {
851 
    /* render menu */
1393 mateusz.vi 852 
    for (i = MENU_NONE; i <= MENU_QUIT + 1; i++) {
853 
      mdr_cout_char_rep(yorigin + i, xorigin, ' ', SCHEME_MENU, slen+4);
1354 mateusz.vi 854 
      if (i == curchoice) {
855 
        attr = SCHEME_MENU_CUR;
1415 mateusz.vi 856 
        mdr_cout_char_rep(yorigin + i, xorigin + 1, ' ', SCHEME_MENU_SEL, slen + 2);
1354 mateusz.vi 857 
      } else {
858 
        attr = SCHEME_MENU;
859 
      }
1416 mateusz.vi 860 
      mdr_cout_str(yorigin + i, xorigin + 2, svarlang_str(8, i), attr, slen);
1354 mateusz.vi 861 
    }
862 
    /* wait for key */
1410 mateusz.vi 863 
    switch (mdr_dos_getkey2()) {
1354 mateusz.vi 864 
      case 0x150: /* down */
865 
        if (curchoice == MENU_QUIT) {
1355 mateusz.vi 866 
          curchoice = MENU_OPEN;
1354 mateusz.vi 867 
        } else {
868 
          curchoice++;
869 
        }
870 
        break;
871 
      case 0x148: /* up */
1355 mateusz.vi 872 
        if (curchoice == MENU_OPEN) {
1354 mateusz.vi 873 
          curchoice = MENU_QUIT;
874 
        } else {
875 
          curchoice--;
876 
        }
877 
        break;
1395 mateusz.vi 878 
      default:
879 
        curchoice = MENU_NONE;
880 
        /* FALLTHRU */
881 
      case '\r': /* ENTER */
882 
        mdr_cout_cursor_show();
883 
        return(curchoice);
1354 mateusz.vi 884 
    }
885 
  }
886 
}
887 
 
888 
 
1426 mateusz.vi 889 
static struct file *select_slot(struct file *dbarr, unsigned char curfile) {
1355 mateusz.vi 890 
  uidirty.from = 0;
891 
  uidirty.to = 0xff;
892 
  uidirty.statusbar = 1;
893 
 
894 
  dbarr = &(dbarr[curfile]);
1415 mateusz.vi 895 
  /* force redraw now, because the main() routine might not if this is exit
896 
   * time and we want to show the user which file has unsaved changes */
1355 mateusz.vi 897 
  ui_basic(dbarr, curfile);
898 
  ui_refresh(dbarr);
899 
  return(dbarr);
900 
}
901 
 
902 
 
1347 mateusz.vi 903 
/* main returns nothing, ie. sved always exits with a zero exit code
904 
 * (this saves 20 bytes of executable footprint) */
905 
void main(void) {
1355 mateusz.vi 906 
  static struct file dbarr[10];
1426 mateusz.vi 907 
  unsigned char curfile;
1355 mateusz.vi 908 
  struct file *db = dbarr; /* visible file is the first slot by default */
1410 mateusz.vi 909 
  struct line far *clipboard = NULL;
1414 mateusz.vi 910 
  unsigned char original_breakflag;
1275 mateusz.vi 911 
 
1418 mateusz.vi 912 
  { /* load NLS resource */
1364 mateusz.vi 913 
    unsigned short i = 0;
914 
    const char far *selfptr;
915 
    char self[128], lang[8];
916 
    selfptr = mdr_dos_selfexe();
917 
    if (selfptr != NULL) {
918 
      do {
919 
        self[i] = selfptr[i];
920 
      } while (self[i++] != 0);
921 
      svarlang_autoload_exepath(self, mdr_dos_getenv(lang, "LANG", sizeof(lang)));
922 
    }
1307 mateusz.vi 923 
  }
1282 mateusz.vi 924 
 
1355 mateusz.vi 925 
  /* preload all slots with empty files */
926 
  for (curfile = 9;; curfile--) {
1418 mateusz.vi 927 
    loadfile(&(dbarr[curfile]), NULL);
1355 mateusz.vi 928 
    if (curfile == 0) break;
929 
  }
930 
 
1356 mateusz.vi 931 
  /* parse argv (and load files, if any passed on) */
932 
  if (parseargv(dbarr) != 0) return;
1282 mateusz.vi 933 
 
1412 mateusz.vi 934 
  if ((mdr_cout_init(&screenw, &screenh) != 0) && (glob_monomode == 0)) {
1333 mateusz.vi 935 
    /* load color scheme if mdr_cout_init returns a color flag */
936 
    SCHEME_TEXT = 0x17;
1354 mateusz.vi 937 
    SCHEME_MENU = 0x70;
1388 mateusz.vi 938 
    SCHEME_MENU_CUR = 0x6f;
939 
    SCHEME_MENU_SEL = 0x66;
1333 mateusz.vi 940 
    SCHEME_STBAR1 = 0x70;
941 
    SCHEME_STBAR2 = 0x78;
1392 mateusz.vi 942 
    SCHEME_STBAR3 = 0x3f;
1333 mateusz.vi 943 
    SCHEME_SCROLL = 0x70;
1388 mateusz.vi 944 
    SCHEME_MSG = 0x6f;
1333 mateusz.vi 945 
    SCHEME_ERR = 0x4f;
946 
  }
1427 mateusz.vi 947 
  screenlastrow = screenh - 1;
948 
  screenlastcol = screenw - 1;
1275 mateusz.vi 949 
 
1414 mateusz.vi 950 
  /* instruct DOS to stop detecting CTRL+C because user needs it for
951 
   * copy/paste operations. also remember the original status of the BREAK
952 
   * flag so I can restore it as it was before quitting. */
953 
  original_breakflag = mdr_dos_ctrlc_disable();
1410 mateusz.vi 954 
 
1275 mateusz.vi 955 
  for (;;) {
956 
    int k;
957 
 
1362 mateusz.vi 958 
    /* add an extra empty line if cursor is on last line and this line is not empty */
959 
    if ((db->cursor->next == NULL) && (db->cursor->len != 0)) {
960 
      if (line_add(db, NULL, 0) == 0) {
961 
        db->cursor = db->cursor->prev; /* line_add() changes the cursor pointer */
962 
      }
963 
    }
964 
 
1327 mateusz.vi 965 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 966 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 967 
 
1392 mateusz.vi 968 
    ui_refresh(db);
969 
 
1355 mateusz.vi 970 
    if ((uidirty.statusbar != 0) || (db->modflagprev != db->modflag)) {
971 
      ui_basic(db, curfile);
1342 mateusz.vi 972 
      uidirty.statusbar = 0;
1355 mateusz.vi 973 
      db->modflagprev = db->modflag;
1342 mateusz.vi 974 
    }
1328 mateusz.vi 975 
#ifdef DBG_LINENUM
976 
      {
977 
        char ddd[10];
978 
        db->curline += 1;
979 
        ddd[0] = '0' + db->curline / 100;
980 
        ddd[1] = '0' + (db->curline % 100) / 10;
981 
        ddd[2] = '0' + (db->curline % 10);
982 
        db->curline -= 1;
983 
        ddd[3] = '/';
984 
        ddd[4] = '0' + db->totlines / 100;
985 
        ddd[5] = '0' + (db->totlines % 100) / 10;
986 
        ddd[6] = '0' + (db->totlines % 10);
987 
        ddd[7] = 0;
1333 mateusz.vi 988 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 989 
      }
990 
#endif
1275 mateusz.vi 991 
 
1410 mateusz.vi 992 
    k = mdr_dos_getkey2();
1282 mateusz.vi 993 
 
1275 mateusz.vi 994 
    if (k == 0x150) { /* down */
1327 mateusz.vi 995 
      cursor_down(db);
1275 mateusz.vi 996 
 
997 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 998 
      cursor_up(db);
1275 mateusz.vi 999 
 
1000 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 1001 
      cursor_right(db);
1275 mateusz.vi 1002 
 
1003 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 1004 
      cursor_left(db);
1275 mateusz.vi 1005 
 
1282 mateusz.vi 1006 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 1007 
      unsigned char dist = db->cursorposy + screenh - 1;
1008 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
1009 
        db->cursor = db->cursor->prev;
1010 
        dist--;
1011 
      }
1012 
      if (dist != 0) {
1013 
        db->cursorposy = 0;
1014 
        db->cursorposx = 0;
1015 
      } else {
1016 
        dist = db->cursorposy;
1017 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
1018 
      }
1019 
      uidirty.from = 0;
1020 
      uidirty.to = 0xff;
1343 mateusz.vi 1021 
      recompute_curline(db);
1282 mateusz.vi 1022 
 
1023 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 1024 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
1025 
      while ((dist != 0) && (db->cursor->next != NULL)) {
1026 
        db->cursor = db->cursor->next;
1027 
        dist--;
1028 
      }
1029 
      if (dist != 0) {
1030 
        db->cursorposy = screenh - 2;
1031 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
1032 
        db->cursorposx = 0;
1033 
      } else {
1034 
        dist = screenh - 2 - db->cursorposy;
1035 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
1036 
      }
1037 
      uidirty.from = 0;
1038 
      uidirty.to = 0xff;
1343 mateusz.vi 1039 
      recompute_curline(db);
1282 mateusz.vi 1040 
 
1041 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 1042 
       cursor_home(db);
1282 mateusz.vi 1043 
 
1044 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 1045 
       cursor_eol(db);
1282 mateusz.vi 1046 
 
1275 mateusz.vi 1047 
    } else if (k == 0x1B) { /* ESC */
1354 mateusz.vi 1048 
      int quitnow = 0;
1394 mateusz.vi 1049 
      char fname[64];
1354 mateusz.vi 1050 
      int saveflag = 0;
1393 mateusz.vi 1051 
      enum MENU_ACTION ui_action;
1275 mateusz.vi 1052 
 
1392 mateusz.vi 1053 
      /* collect the exact menu action and clear the screen */
1054 
      ui_action = ui_menu();
1055 
      ui_refresh(db);
1354 mateusz.vi 1056 
 
1392 mateusz.vi 1057 
      switch (ui_action) {
1058 
 
1354 mateusz.vi 1059 
        case MENU_NONE:
1060 
          break;
1061 
 
1062 
        case MENU_OPEN:
1063 
          /* display a warning if unsaved changes are pending */
1064 
          if (db->modflag != 0) ui_msg(svarlang_str(0,4), svarlang_str(0,8), SCHEME_MSG);
1065 
 
1066 
          /* ask for filename */
1067 
          ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
1068 
          if (fname[0] != 0) {
1359 mateusz.vi 1069 
            int err;
1354 mateusz.vi 1070 
            err = loadfile(db, fname);
1071 
            if (err != 0) {
1072 
              if (err == 1) {
1073 
                ui_msg(svarlang_str(0,11), NULL, SCHEME_ERR); /* file not found */
1074 
              } else {
1075 
                ui_msg(svarlang_str(0,10), NULL, SCHEME_ERR);  /* ERROR */
1076 
              }
1077 
              mdr_bios_tickswait(44); /* 3s */
1418 mateusz.vi 1078 
              loadfile(db, NULL);
1354 mateusz.vi 1079 
            }
1080 
          }
1393 mateusz.vi 1081 
          uidirty.from = 0;
1082 
          uidirty.to = 0xff;
1083 
          uidirty.statusbar = 1;
1354 mateusz.vi 1084 
          break;
1085 
 
1086 
        case MENU_SAVEAS:
1087 
          saveflag = 1;
1088 
          /* FALLTHRU */
1089 
        case MENU_SAVE:
1090 
          if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
1091 
            ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
1092 
            if (*fname == 0) break;
1093 
            saveflag = savefile(db, fname);
1094 
            if (saveflag == 0) memcpy(db->fname, fname, sizeof(fname));
1095 
          } else {
1096 
            saveflag = savefile(db, NULL);
1097 
          }
1098 
 
1395 mateusz.vi 1099 
          mdr_cout_cursor_hide();
1100 
 
1354 mateusz.vi 1101 
          if (saveflag == 0) {
1102 
            db->modflag = 0;
1103 
            ui_msg(svarlang_str(0, 2), NULL, SCHEME_MSG);
1104 
            mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
1105 
          } else {
1429 mateusz.vi 1106 
            ui_msg(svarlang_str(0, 10), NULL, SCHEME_ERR);
1354 mateusz.vi 1107 
            mdr_bios_tickswait(36); /* 2s */
1108 
          }
1395 mateusz.vi 1109 
          mdr_cout_cursor_show();
1354 mateusz.vi 1110 
          break;
1111 
 
1355 mateusz.vi 1112 
        case MENU_CLOSE:
1113 
          if (ui_confirm_if_unsaved(db) == 0) {
1418 mateusz.vi 1114 
            loadfile(db, NULL);
1355 mateusz.vi 1115 
          }
1116 
          uidirty.from = 0;
1117 
          uidirty.to = 0xff;
1118 
          uidirty.statusbar = 1;
1119 
          break;
1120 
 
1354 mateusz.vi 1121 
        case MENU_CHGEOL:
1393 mateusz.vi 1122 
          db->modflag = 1;
1354 mateusz.vi 1123 
          db->lfonly ^= 1;
1124 
          break;
1125 
 
1126 
        case MENU_QUIT:
1355 mateusz.vi 1127 
          quitnow = 1;
1128 
          for (curfile = 0; curfile < 10; curfile++) {
1129 
            if (dbarr[curfile].modflag) {
1130 
              db = select_slot(dbarr, curfile);
1131 
              if (ui_confirm_if_unsaved(db) != 0) quitnow = 0;
1132 
            }
1133 
          }
1354 mateusz.vi 1134 
          break;
1135 
      }
1136 
 
1137 
      if (quitnow) break;
1138 
 
1289 mateusz.vi 1139 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 1140 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 1141 
      /* add a new line */
1328 mateusz.vi 1142 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1393 mateusz.vi 1143 
        db->modflag = 1;
1328 mateusz.vi 1144 
        db->cursor = db->cursor->prev; /* back to original line */
1427 mateusz.vi 1145 
        db->curline -= 1;
1289 mateusz.vi 1146 
        /* trim the line above */
1328 mateusz.vi 1147 
        db->cursor->len = off;
1289 mateusz.vi 1148 
        /* move cursor to the (new) line below */
1328 mateusz.vi 1149 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 1150 
        uidirty.to = 0xff;
1328 mateusz.vi 1151 
        cursor_down(db);
1152 
        cursor_home(db);
1289 mateusz.vi 1153 
      } else {
1154 
        /* ERROR: OUT OF MEMORY */
1155 
      }
1156 
 
1292 mateusz.vi 1157 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 1158 
      del(db);
1292 mateusz.vi 1159 
 
1302 mateusz.vi 1160 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 1161 
      bkspc(db);
1302 mateusz.vi 1162 
 
1308 mateusz.vi 1163 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 1164 
      char c = k;
1327 mateusz.vi 1165 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 1166 
 
1317 mateusz.vi 1167 
    } else if (k == 0x009) { /* TAB */
1412 mateusz.vi 1168 
      if (glob_tablessmode == 0) {
1169 
        insert_in_line(db, "        ", 8);
1170 
      } else {
1171 
        insert_in_line(db, "\t", 1);
1172 
      }
1317 mateusz.vi 1173 
 
1355 mateusz.vi 1174 
    } else if ((k >= 0x13b) && (k <= 0x144)) { /* F1..F10 */
1175 
      curfile = k - 0x13b;
1176 
      db = select_slot(dbarr, curfile);
1309 mateusz.vi 1177 
 
1325 mateusz.vi 1178 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
1179 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
1180 
      for (;;) {
1181 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
1182 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 1183 
        cursor_right(db);
1325 mateusz.vi 1184 
      }
1185 
      /* now skip to next non-space or end of file */
1186 
      for (;;) {
1327 mateusz.vi 1187 
        cursor_right(db);
1325 mateusz.vi 1188 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1189 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
1190 
      }
1191 
 
1192 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 1193 
      cursor_left(db);
1325 mateusz.vi 1194 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
1195 
      for (;;) {
1196 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
1197 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 1198 
        cursor_left(db);
1325 mateusz.vi 1199 
      }
1200 
      /* now skip to next space or start of file */
1201 
      for (;;) {
1327 mateusz.vi 1202 
        cursor_left(db);
1325 mateusz.vi 1203 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 1204 
          cursor_right(db);
1325 mateusz.vi 1205 
          break;
1206 
        }
1207 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
1208 
      }
1209 
 
1410 mateusz.vi 1210 
    } else if ((k == 0x003) || (k == 0x018)) { /* CTRL+C or CTRL+X */
1211 
      /* free clipboard if anything in it */
1212 
      if (clipboard != NULL) line_free(clipboard);
1213 
 
1214 
      /* copy cursor line to clipboard */
1215 
      clipboard = line_calloc(db->cursor->len);
1216 
      if (clipboard == NULL) {
1217 
        ui_msg(svarlang_str(0, 10), NULL, SCHEME_ERR); /* ERROR */
1218 
        mdr_bios_tickswait(18); /* 1s */
1219 
      } else {
1427 mateusz.vi 1220 
        mdr_cout_char_rep(db->cursorposy, 0, ' ', ((SCHEME_TEXT >> 4) | (SCHEME_TEXT << 4)) & 0xff, screenlastcol);
1410 mateusz.vi 1221 
        uidirty.from = db->cursorposy;
1222 
        uidirty.to = db->cursorposy;
1223 
        if (db->cursor->len != 0) {
1224 
          _fmemmove(clipboard->payload, db->cursor->payload, db->cursor->len);
1225 
          clipboard->len = db->cursor->len;
1226 
        }
1227 
        mdr_bios_tickswait(2); /* ca 100ms */
1228 
 
1229 
        /* if this is about cutting the line (CTRL+X) then delete cur line */
1230 
        if ((k == 0x018) && ((db->cursor->next != NULL) || (db->cursor->prev != NULL))) {
1231 
          if (db->cursor->next) db->cursor->next->prev = db->cursor->prev;
1232 
          if (db->cursor->prev) db->cursor->prev->next = db->cursor->next;
1233 
          clipboard->prev = db->cursor;
1234 
          if (db->cursor->next) {
1235 
            db->cursor = db->cursor->next;
1236 
          } else {
1237 
            cursor_up(db);
1238 
          }
1239 
          line_free(clipboard->prev);
1423 mateusz.vi 1240 
          db->totlines -= 1;
1410 mateusz.vi 1241 
          uidirty.from = 0;
1242 
          uidirty.to = 0xff;
1412 mateusz.vi 1243 
          recompute_curline(db);
1410 mateusz.vi 1244 
        }
1245 
      }
1246 
 
1420 mateusz.vi 1247 
    } else if ((k == 0x016) && (clipboard != NULL)) { /* CTRL+V */
1248 
      if (line_add(db, clipboard->payload, clipboard->len) != 0) {
1249 
        ui_msg(svarlang_str(0, 10), NULL, SCHEME_ERR); /* ERROR */
1250 
        mdr_bios_tickswait(18); /* 1s */
1251 
      } else {
1252 
        /* rewire the linked list so the new line is on top of the previous one */
1253 
        clipboard->prev = db->cursor->prev;
1254 
        /* remove prev node from list */
1255 
        db->cursor->prev = db->cursor->prev->prev;
1256 
        if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor;
1257 
        /* insert the node after cursor now */
1258 
        clipboard->prev->next = db->cursor->next;
1259 
        if (db->cursor->next != NULL) db->cursor->next->prev = clipboard->prev;
1260 
        clipboard->prev->prev = db->cursor;
1261 
        db->cursor->next = clipboard->prev;
1262 
        cursor_down(db);
1410 mateusz.vi 1263 
      }
1264 
      uidirty.from = 0;
1265 
      uidirty.to = 0xff;
1412 mateusz.vi 1266 
      recompute_curline(db);
1410 mateusz.vi 1267 
 
1333 mateusz.vi 1268 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 1269 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
1270 
      char buff[4];
1271 
      const char *HEX = "0123456789ABCDEF";
1272 
      buff[0] = HEX[(k >> 8) & 15];
1273 
      buff[1] = HEX[(k >> 4) & 15];
1274 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 1275 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
1276 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1410 mateusz.vi 1277 
      mdr_dos_getkey2();
1275 mateusz.vi 1278 
      break;
1333 mateusz.vi 1279 
#endif
1275 mateusz.vi 1280 
    }
1281 
  }
1282 
 
1283 
  mdr_cout_close();
1284 
 
1414 mateusz.vi 1285 
  /* restore the DOS BREAK flag if it was originally set */
1286 
  if (original_breakflag != 0) mdr_dos_ctrlc_enable();
1287 
 
1320 mateusz.vi 1288 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 1289 
 
1347 mateusz.vi 1290 
  return;
1275 mateusz.vi 1291 
}