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1283 mateusz.vi 1 
/* Sved, the SvarDOS editor
2 
 *
3 
 * Copyright (C) 2023 Mateusz Viste
4 
 *
5 
 * Sved is released under the terms of the MIT license.
6 
 *
7 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 
 * of this software and associated documentation files (the "Software"), to
9 
 * deal in the Software without restriction, including without limitation the
10 
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
11 
 * sell copies of the Software, and to permit persons to whom the Software is
12 
 * furnished to do so, subject to the following conditions:
13 
 *
14 
 * The above copyright notice and this permission notice shall be included in
15 
 * all copies or substantial portions of the Software.
16 
 *
17 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22 
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
23 
 * IN THE SOFTWARE.
24 
 */
1275 mateusz.vi 25 
 
1338 mateusz.vi 26 
#include <dos.h>      /* _dos_open(), _dos_read(), _dos_close(), ... */
27 
#include <fcntl.h>    /* O_RDONLY, O_WRONLY */
1275 mateusz.vi 28 
#include <string.h>
29 
 
1312 mateusz.vi 30 
#include "mdr\bios.h"
1275 mateusz.vi 31 
#include "mdr\cout.h"
1307 mateusz.vi 32 
#include "mdr\dos.h"
1275 mateusz.vi 33 
 
1282 mateusz.vi 34 
#include "svarlang\svarlang.h"
35 
 
1326 mateusz.vi 36 
 
1356 mateusz.vi 37 
#define PVER "2023.0"
38 
#define PDATE "2023"
39 
 
1326 mateusz.vi 40 
/*****************************************************************************
41 
 * global variables and definitions                                          *
42 
 *****************************************************************************/
43 
 
1275 mateusz.vi 44 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
1333 mateusz.vi 45 
static unsigned char SCHEME_TEXT   = 0x07,
1354 mateusz.vi 46 
                     SCHEME_MENU   = 0x70,
47 
                     SCHEME_MENU_CUR= 0x0f,
48 
                     SCHEME_MENU_SEL= 0x00,
1333 mateusz.vi 49 
                     SCHEME_STBAR1 = 0x70,
1358 mateusz.vi 50 
                     SCHEME_STBAR2 = 0x70, /* greyed out information */
51 
                     SCHEME_STBAR3 = 0x70, /* query */
1333 mateusz.vi 52 
                     SCHEME_SCROLL = 0x70,
53 
                     SCHEME_MSG    = 0x70,
1358 mateusz.vi 54 
                     SCHEME_ERR    = 0x70;
1327 mateusz.vi 55 
 
1427 mateusz.vi 56 
static unsigned char screenw, screenh, screenlastrow, screenlastcol;
1412 mateusz.vi 57 
static unsigned char glob_monomode, glob_tablessmode;
1275 mateusz.vi 58 
 
1327 mateusz.vi 59 
static struct {
60 
    unsigned char from;
61 
    unsigned char to;
1342 mateusz.vi 62 
    unsigned char statusbar;
63 
} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */
1327 mateusz.vi 64 
 
1275 mateusz.vi 65 
#define SCROLL_CURSOR 0xB1
66 
 
67 
struct line {
1430 mateusz.vi 68 
  unsigned short len;
69 
  struct line far *next;
1288 mateusz.vi 70 
  struct line far *prev;
1275 mateusz.vi 71 
  char payload[1];
72 
};
73 
 
1315 mateusz.vi 74 
struct file {
1288 mateusz.vi 75 
  struct line far *cursor;
1275 mateusz.vi 76 
  unsigned short xoffset;
1348 mateusz.vi 77 
  unsigned short cursorposx;
78 
  unsigned short cursorposy;
1328 mateusz.vi 79 
  unsigned short totlines;
80 
  unsigned short curline;
1436 mateusz.vi 81 
  unsigned short curline_prev;
1330 mateusz.vi 82 
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
83 
  char modflag;  /* non-zero if file has been modified since last save */
1355 mateusz.vi 84 
  char modflagprev;
1332 mateusz.vi 85 
  char fname[128];
1275 mateusz.vi 86 
};
87 
 
88 
 
1326 mateusz.vi 89 
/*****************************************************************************
90 
 * functions                                                                 *
91 
 *****************************************************************************/
92 
 
1339 mateusz.vi 93 
static struct line far *line_calloc(unsigned short siz) {
1342 mateusz.vi 94 
  struct line far *res;
1339 mateusz.vi 95 
  unsigned int seg;
1341 mateusz.vi 96 
  if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);
1342 mateusz.vi 97 
  res = MK_FP(seg, 0);
98 
  _fmemset(res, 0, sizeof(struct line) + siz);
1339 mateusz.vi 99 
  return(MK_FP(seg, 0));
100 
}
101 
 
102 
 
103 
static void line_free(struct line far *ptr) {
104 
  _dos_freemem(FP_SEG(ptr));
105 
}
106 
 
107 
 
1348 mateusz.vi 108 
static int curline_resize(struct file far *db, unsigned short newsiz) {
1339 mateusz.vi 109 
  unsigned int maxavail;
110 
  struct line far *newptr;
111 
 
1341 mateusz.vi 112 
  /* try resizing the block (much faster) */
113 
  if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);
1339 mateusz.vi 114 
 
115 
  /* create a new block and copy data over */
116 
  newptr = line_calloc(newsiz);
1340 mateusz.vi 117 
  if (newptr == NULL) return(-1);
118 
  _fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
119 
 
120 
  /* rewire the linked list */
121 
  db->cursor = newptr;
122 
  if (newptr->next) newptr->next->prev = newptr;
123 
  if (newptr->prev) newptr->prev->next = newptr;
124 
 
125 
  return(0);
1339 mateusz.vi 126 
}
127 
 
128 
 
1328 mateusz.vi 129 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 130 
 * returns non-zero on error */
1328 mateusz.vi 131 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 132 
  struct line far *l;
1275 mateusz.vi 133 
 
1339 mateusz.vi 134 
  l = line_calloc(slen);
1287 mateusz.vi 135 
  if (l == NULL) return(-1);
136 
 
1275 mateusz.vi 137 
  l->prev = db->cursor;
138 
  if (db->cursor) {
139 
    l->next = db->cursor->next;
140 
    db->cursor->next = l;
141 
    l->next->prev = l;
142 
  }
143 
  db->cursor = l;
1342 mateusz.vi 144 
  if (slen > 0) {
145 
    _fmemmove(l->payload, line, slen);
146 
    l->len = slen;
147 
  }
1287 mateusz.vi 148 
 
1328 mateusz.vi 149 
  db->totlines += 1;
150 
  db->curline += 1;
151 
 
1287 mateusz.vi 152 
  return(0);
1275 mateusz.vi 153 
}
154 
 
155 
 
1348 mateusz.vi 156 
static void ui_getstring(const char *query, char *s, unsigned short maxlen) {
157 
  unsigned short len = 0;
158 
  unsigned char y, x;
1332 mateusz.vi 159 
  int k;
160 
 
161 
  if (maxlen == 0) return;
162 
  maxlen--; /* make room for the nul terminator */
163 
 
1427 mateusz.vi 164 
  y = screenlastrow;
1332 mateusz.vi 165 
 
166 
  /* print query string */
1333 mateusz.vi 167 
  x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);
168 
  mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 169 
 
170 
  for (;;) {
171 
    mdr_cout_locate(y, x + len);
1410 mateusz.vi 172 
    k = mdr_dos_getkey2();
1332 mateusz.vi 173 
 
1345 mateusz.vi 174 
    switch (k) {
175 
      case 0x1b: /* ESC */
176 
        s[0] = 0;
177 
        return;
178 
      case '\r':
179 
        s[len] = 0;
180 
        return;
181 
      case 0x08: /* BKSPC */
182 
        if (len > 0) {
183 
          len--;
184 
          mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);
185 
        }
186 
        break;
187 
      default:
188 
        if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
189 
          mdr_cout_char(y, x + len, k, SCHEME_STBAR3);
190 
          s[len++] = k;
191 
        }
1332 mateusz.vi 192 
    }
1345 mateusz.vi 193 
  }
1332 mateusz.vi 194 
 
195 
}
196 
 
197 
 
1324 mateusz.vi 198 
/* append a nul-terminated string to line at cursor position */
199 
static int line_append(struct file *f, const char far *buf, unsigned short len) {
1427 mateusz.vi 200 
  if (sizeof(struct line) + f->cursor->len + len < len) goto ERR; /* overflow check */
201 
  if (curline_resize(f, f->cursor->len + len) != 0) goto ERR;
202 
 
1337 mateusz.vi 203 
  _fmemmove(f->cursor->payload + f->cursor->len, buf, len);
1324 mateusz.vi 204 
  f->cursor->len += len;
205 
 
206 
  return(0);
1427 mateusz.vi 207 
  ERR:
208 
  return(-1);
1324 mateusz.vi 209 
}
210 
 
211 
 
1315 mateusz.vi 212 
static void db_rewind(struct file *db) {
1275 mateusz.vi 213 
  if (db->cursor == NULL) return;
214 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 215 
  db->curline = 0;
1275 mateusz.vi 216 
}
217 
 
218 
 
1435 mateusz.vi 219 
static void ui_statusbar(const struct file *db, unsigned char slotnum) {
1356 mateusz.vi 220 
  const char *s = svarlang_strid(0); /* ESC=MENU */
1348 mateusz.vi 221 
  unsigned short helpcol = screenw - strlen(s);
1394 mateusz.vi 222 
  unsigned short maxfnlen = helpcol - 14;
1275 mateusz.vi 223 
 
1425 mateusz.vi 224 
  /* slot number (guaranteed to be 0-9) */
1355 mateusz.vi 225 
  {
226 
    char slot[4] = "#00";
1425 mateusz.vi 227 
    if (slotnum == 9) {
228 
      slot[1] = '1';
229 
    } else {
230 
      slotnum++;
231 
      slot[2] += slotnum;
232 
    }
1427 mateusz.vi 233 
    mdr_cout_str(screenlastrow, 0, slot, SCHEME_STBAR2, 3);
1355 mateusz.vi 234 
  }
1313 mateusz.vi 235 
 
1355 mateusz.vi 236 
  /* fill rest of status bar with background */
1427 mateusz.vi 237 
  mdr_cout_char_rep(screenlastrow, 3, ' ', SCHEME_STBAR1, helpcol - 3);
1355 mateusz.vi 238 
 
1393 mateusz.vi 239 
  /* filename and modflag */
1330 mateusz.vi 240 
  {
1394 mateusz.vi 241 
    const char *fn;
1355 mateusz.vi 242 
    unsigned short x;
1394 mateusz.vi 243 
    if (db->fname[0] == 0) {
244 
      fn = svarlang_str(0, 1); /* "UNTITLED" */
245 
    } else {
246 
      /* display filename up to maxfnlen chars */
247 
      fn = db->fname;
248 
      x = strlen(fn);
249 
      if (x > maxfnlen) fn += x - maxfnlen;
250 
    }
1427 mateusz.vi 251 
    x = mdr_cout_str(screenlastrow, 4, fn, SCHEME_STBAR1, maxfnlen);
252 
    if (db->modflag) mdr_cout_char(screenlastrow, 5 + x, '!', SCHEME_STBAR2);
1321 mateusz.vi 253 
  }
1313 mateusz.vi 254 
 
255 
  /* eol type */
1330 mateusz.vi 256 
  {
257 
    const char *eoltype = "CRLF";
1353 mateusz.vi 258 
    if (db->lfonly) eoltype += 2;
1427 mateusz.vi 259 
    mdr_cout_str(screenlastrow, helpcol - 6, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 260 
  }
1313 mateusz.vi 261 
 
1438 mateusz.vi 262 
  /* line numbers */
1436 mateusz.vi 263 
  {
1438 mateusz.vi 264 
    unsigned short x;
265 
    unsigned char count = 0;
1436 mateusz.vi 266 
    unsigned short coloffset = 9;
1438 mateusz.vi 267 
 
268 
    x = 1 + db->totlines;
269 
    AGAIN:
1436 mateusz.vi 270 
    do {
271 
      mdr_cout_char(screenlastrow, helpcol - coloffset, '0' + (x % 10), SCHEME_STBAR1);
272 
      x /= 10;
273 
      coloffset++;
274 
    } while (x);
1438 mateusz.vi 275 
    /* redo same exercise, but printing the current line now */
276 
    if (count == 0) {
277 
      count = 1;
278 
      mdr_cout_char(screenlastrow, helpcol - coloffset, '/', SCHEME_STBAR1);
279 
      coloffset++;
280 
      x = 1 + db->curline;
281 
      goto AGAIN;
282 
    }
283 
 
1436 mateusz.vi 284 
  }
285 
 
1427 mateusz.vi 286 
  mdr_cout_str(screenlastrow, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 287 
}
288 
 
289 
 
1331 mateusz.vi 290 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
1312 mateusz.vi 291 
  unsigned short x, y, msglen, i;
1428 mateusz.vi 292 
  unsigned short msg2flag = 0;
1331 mateusz.vi 293 
 
294 
  msglen = strlen(msg1);
295 
  if (msg2) {
296 
    msg2flag = 1;
297 
    i = strlen(msg2);
298 
    if (i > msglen) msglen = i;
299 
  }
300 
 
301 
  y = (screenh - 6) >> 1;
1312 mateusz.vi 302 
  x = (screenw - msglen - 4) >> 1;
1331 mateusz.vi 303 
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
304 
  x++;
1345 mateusz.vi 305 
 
1331 mateusz.vi 306 
  mdr_cout_str(y+1, x, msg1, attr, msglen);
307 
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
1312 mateusz.vi 308 
 
1327 mateusz.vi 309 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 310 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 311 
}
312 
 
313 
 
1412 mateusz.vi 314 
static unsigned char ui_confirm_if_unsaved(const struct file *db) {
1355 mateusz.vi 315 
  unsigned char r = 0;
1342 mateusz.vi 316 
  if (db->modflag == 0) return(0);
317 
 
1355 mateusz.vi 318 
  mdr_cout_cursor_hide();
319 
 
1342 mateusz.vi 320 
  /* if file has been modified then ask for confirmation */
321 
  ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);
1410 mateusz.vi 322 
  if (mdr_dos_getkey2() != '\r') r = 1;
1342 mateusz.vi 323 
 
1355 mateusz.vi 324 
  mdr_cout_cursor_show();
325 
 
326 
  return(r);
1342 mateusz.vi 327 
}
328 
 
329 
 
1327 mateusz.vi 330 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 331 
  unsigned char x;
1310 mateusz.vi 332 
  const struct line far *l;
1316 mateusz.vi 333 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 334 
 
1392 mateusz.vi 335 
  /* quit early if nothing to refresh */
336 
  if (uidirty.from == 0xff) return;
337 
 
1288 mateusz.vi 338 
#ifdef DBG_REFRESH
1282 mateusz.vi 339 
  static char m = 'a';
340 
  m++;
341 
  if (m > 'z') m = 'a';
1288 mateusz.vi 342 
#endif
1282 mateusz.vi 343 
 
1310 mateusz.vi 344 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 345 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 346 
 
1310 mateusz.vi 347 
  /* iterate over lines and redraw whatever needs to be redrawn */
348 
  for (; l != NULL; l = l->next, y++) {
349 
 
350 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 351 
    if (y < uidirty.from) continue;
352 
    if (y > uidirty.to) break;
1282 mateusz.vi 353 
 
1318 mateusz.vi 354 
    x = 0;
1275 mateusz.vi 355 
    if (db->xoffset < l->len) {
1318 mateusz.vi 356 
      unsigned char i, limit;
357 
      if (l->len - db->xoffset < screenw) {
358 
        limit = l->len;
359 
      } else {
1427 mateusz.vi 360 
        limit = db->xoffset + screenlastcol;
1318 mateusz.vi 361 
      }
1333 mateusz.vi 362 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 363 
    }
1282 mateusz.vi 364 
 
1318 mateusz.vi 365 
    /* write empty spaces until end of line */
1427 mateusz.vi 366 
    if (x < screenlastcol) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenlastcol - x);
1318 mateusz.vi 367 
 
1288 mateusz.vi 368 
#ifdef DBG_REFRESH
1333 mateusz.vi 369 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 370 
#endif
1282 mateusz.vi 371 
 
1275 mateusz.vi 372 
    if (y == screenh - 2) break;
373 
  }
1310 mateusz.vi 374 
 
1319 mateusz.vi 375 
  /* fill all lines below if empty (and they need to be redrawn) */
376 
  if (l == NULL) {
1427 mateusz.vi 377 
    while ((y < screenlastrow) && (y < uidirty.to)) {
378 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenlastcol);
1319 mateusz.vi 379 
    }
1318 mateusz.vi 380 
  }
1328 mateusz.vi 381 
 
382 
  /* scroll bar */
1427 mateusz.vi 383 
  for (y = 0; y < screenlastrow; y++) {
384 
    mdr_cout_char(y, screenlastcol, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 385 
  }
386 
 
387 
  /* scroll cursor */
388 
  if (db->totlines >= screenh) {
389 
    unsigned short topline = db->curline - db->cursorposy;
390 
    unsigned short col;
391 
    unsigned short totlines = db->totlines - screenh + 1;
392 
    if (db->totlines - screenh > screenh) {
1427 mateusz.vi 393 
      col = topline / (totlines / screenlastrow);
1328 mateusz.vi 394 
    } else {
1427 mateusz.vi 395 
      col = topline * screenlastrow / totlines;
1328 mateusz.vi 396 
    }
1427 mateusz.vi 397 
    if (col >= screenlastrow) col = screenh - 2;
398 
    mdr_cout_char(col, screenlastcol, ' ', SCHEME_SCROLL);
1328 mateusz.vi 399 
  }
1392 mateusz.vi 400 
 
401 
  /* clear out the dirty flag */
402 
  uidirty.from = 0xff;
1275 mateusz.vi 403 
}
404 
 
405 
 
1327 mateusz.vi 406 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 407 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 408 
 
409 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 410 
    db->cursorposx = 0;
1275 mateusz.vi 411 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 412 
    uidirty.from = 0;
413 
    uidirty.to = 0xff;
1275 mateusz.vi 414 
  } else {
1316 mateusz.vi 415 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 416 
  }
417 
}
418 
 
419 
 
1327 mateusz.vi 420 
static void cursor_up(struct file *db) {
1422 mateusz.vi 421 
  if (db->cursor->prev == NULL) return;
422 
 
423 
  db->curline -= 1;
424 
  db->cursor = db->cursor->prev;
425 
  if (db->cursorposy == 0) {
426 
    uidirty.from = 0;
427 
    uidirty.to = 0xff;
428 
  } else {
429 
    db->cursorposy -= 1;
1275 mateusz.vi 430 
  }
431 
}
432 
 
433 
 
1327 mateusz.vi 434 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 435 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 436 
  if (db->xoffset > db->cursor->len) {
437 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 438 
    uidirty.from = 0;
439 
    uidirty.to = 0xff;
1282 mateusz.vi 440 
  }
441 
 
1427 mateusz.vi 442 
  if (db->xoffset + screenlastcol <= db->cursor->len) {
1282 mateusz.vi 443 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 444 
    uidirty.from = 0;
445 
    uidirty.to = 0xff;
1282 mateusz.vi 446 
  }
1316 mateusz.vi 447 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 448 
}
449 
 
450 
 
1327 mateusz.vi 451 
static void cursor_down(struct file *db) {
1422 mateusz.vi 452 
  if (db->cursor->next == NULL) return;
453 
 
454 
  db->curline += 1;
455 
  db->cursor = db->cursor->next;
456 
  if (db->cursorposy < screenh - 2) {
457 
    db->cursorposy += 1;
458 
  } else {
459 
    uidirty.from = 0;
460 
    uidirty.to = 0xff;
1276 mateusz.vi 461 
  }
462 
}
463 
 
464 
 
1327 mateusz.vi 465 
static void cursor_left(struct file *db) {
1316 mateusz.vi 466 
  if (db->cursorposx > 0) {
467 
    db->cursorposx -= 1;
1302 mateusz.vi 468 
  } else if (db->xoffset > 0) {
469 
    db->xoffset -= 1;
1327 mateusz.vi 470 
    uidirty.from = 0;
471 
    uidirty.to = 0xff;
1302 mateusz.vi 472 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 473 
    cursor_up(db);
474 
    cursor_eol(db);
1302 mateusz.vi 475 
  }
476 
}
477 
 
478 
 
1327 mateusz.vi 479 
static void cursor_home(struct file *db) {
1316 mateusz.vi 480 
  db->cursorposx = 0;
1282 mateusz.vi 481 
  if (db->xoffset != 0) {
482 
    db->xoffset = 0;
1327 mateusz.vi 483 
    uidirty.from = 0;
484 
    uidirty.to = 0xff;
1282 mateusz.vi 485 
  }
1276 mateusz.vi 486 
}
487 
 
488 
 
1327 mateusz.vi 489 
static void cursor_right(struct file *db) {
1316 mateusz.vi 490 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
491 
    if (db->cursorposx < screenw - 2) {
492 
      db->cursorposx += 1;
1308 mateusz.vi 493 
    } else {
494 
      db->xoffset += 1;
1327 mateusz.vi 495 
      uidirty.from = 0;
496 
      uidirty.to = 0xff;
1308 mateusz.vi 497 
    }
1357 mateusz.vi 498 
  } else if (db->cursor->next != NULL) { /* jump to start of next line */
1327 mateusz.vi 499 
    cursor_down(db);
500 
    cursor_home(db);
1308 mateusz.vi 501 
  }
502 
}
503 
 
504 
 
1327 mateusz.vi 505 
static void del(struct file *db) {
1316 mateusz.vi 506 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
507 
    _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 508 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 509 
    uidirty.from = db->cursorposy;
510 
    uidirty.to = db->cursorposy;
1393 mateusz.vi 511 
    db->modflag = 1;
1292 mateusz.vi 512 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
513 
    struct line far *nextline = db->cursor->next;
514 
    if (db->cursor->next->len > 0) {
1340 mateusz.vi 515 
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
1337 mateusz.vi 516 
        _fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 517 
        db->cursor->len += db->cursor->next->len;
518 
      }
519 
    }
1340 mateusz.vi 520 
 
1292 mateusz.vi 521 
    db->cursor->next = db->cursor->next->next;
522 
    db->cursor->next->prev = db->cursor;
1340 mateusz.vi 523 
 
1339 mateusz.vi 524 
    line_free(nextline);
1327 mateusz.vi 525 
    uidirty.from = db->cursorposy;
526 
    uidirty.to = 0xff;
1328 mateusz.vi 527 
    db->totlines -= 1;
1393 mateusz.vi 528 
    db->modflag = 1;
1292 mateusz.vi 529 
  }
530 
}
531 
 
532 
 
1327 mateusz.vi 533 
static void bkspc(struct file *db) {
1302 mateusz.vi 534 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1421 mateusz.vi 535 
  if ((db->cursorposx + db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 536 
 
1327 mateusz.vi 537 
  cursor_left(db);
538 
  del(db);
1302 mateusz.vi 539 
}
540 
 
541 
 
1346 mateusz.vi 542 
/* returns 0 on success, 1 on file not found, 2 on other error */
1359 mateusz.vi 543 
static int loadfile(struct file *db, const char *fname) {
1324 mateusz.vi 544 
  char buff[512]; /* read one entire sector at a time (faster) */
545 
  char *buffptr;
546 
  unsigned int len, llen;
1287 mateusz.vi 547 
  int fd;
1324 mateusz.vi 548 
  unsigned char eolfound;
1287 mateusz.vi 549 
 
1355 mateusz.vi 550 
  /* free the entire linked list of lines */
551 
  db_rewind(db);
552 
  while (db->cursor) {
553 
    struct line far *victim;
554 
    victim = db->cursor;
555 
    db->cursor = db->cursor->next;
556 
    line_free(victim);
557 
  }
1321 mateusz.vi 558 
 
1355 mateusz.vi 559 
  /* zero out the struct */
560 
  bzero(db, sizeof(struct file));
561 
 
1418 mateusz.vi 562 
  if (fname == NULL) goto SKIPLOADING;
1321 mateusz.vi 563 
 
1355 mateusz.vi 564 
  memcpy(db->fname, fname, strlen(fname));
565 
 
1287 mateusz.vi 566 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
1346 mateusz.vi 567 
    return(1);
1287 mateusz.vi 568 
  }
569 
 
1313 mateusz.vi 570 
  db->lfonly = 1;
571 
 
1324 mateusz.vi 572 
  /* start by adding an empty line */
1328 mateusz.vi 573 
  if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 574 
    /* TODO ERROR HANDLING */
575 
  }
1287 mateusz.vi 576 
 
1324 mateusz.vi 577 
  for (eolfound = 0;;) {
578 
    unsigned short consumedbytes;
579 
 
580 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
581 
    buffptr = buff;
582 
 
583 
    FINDLINE:
584 
 
1361 mateusz.vi 585 
    /* look for nearest \n (also expand tabs) */
1324 mateusz.vi 586 
    for (consumedbytes = 0;; consumedbytes++) {
1361 mateusz.vi 587 
 
588 
      if (buffptr[consumedbytes] == '\t') {
589 
        llen = consumedbytes;
590 
        break;
591 
      }
592 
 
1324 mateusz.vi 593 
      if (consumedbytes == len) {
594 
        llen = consumedbytes;
595 
        break;
1323 mateusz.vi 596 
      }
1324 mateusz.vi 597 
      if (buffptr[consumedbytes] == '\r') {
598 
        llen = consumedbytes;
599 
        consumedbytes++;
600 
        db->lfonly = 0;
1320 mateusz.vi 601 
        break;
602 
      }
1324 mateusz.vi 603 
      if (buffptr[consumedbytes] == '\n') {
604 
        eolfound = 1;
605 
        llen = consumedbytes;
606 
        consumedbytes++;
607 
        break;
608 
      }
1287 mateusz.vi 609 
    }
1324 mateusz.vi 610 
 
611 
    /* consumedbytes is the amount of bytes processed from buffptr,
612 
     * llen is the length of line's payload (without its line terminator) */
613 
 
614 
    /* append content, if line is non-empty */
615 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1339 mateusz.vi 616 
      goto IOERR;
1287 mateusz.vi 617 
    }
618 
 
1419 mateusz.vi 619 
    /* allocate the next line if current line ended */
1324 mateusz.vi 620 
    if (eolfound) {
1328 mateusz.vi 621 
      if (line_add(db, NULL, 0) != 0) {
1339 mateusz.vi 622 
        goto IOERR;
1324 mateusz.vi 623 
      }
624 
      eolfound = 0;
625 
    }
1287 mateusz.vi 626 
 
1361 mateusz.vi 627 
    /* append 8 spaces if tab char found */
1412 mateusz.vi 628 
    if ((consumedbytes < len) && (buffptr[consumedbytes] == '\t') && (glob_tablessmode == 0)) {
1361 mateusz.vi 629 
      consumedbytes++;
630 
      if (line_append(db, "        ", 8) != 0) {
631 
        goto IOERR;
632 
      }
633 
    }
634 
 
1324 mateusz.vi 635 
    /* anything left? process the buffer leftover again */
636 
    if (consumedbytes < len) {
637 
      len -= consumedbytes;
638 
      buffptr += consumedbytes;
639 
      goto FINDLINE;
640 
    }
641 
 
642 
  }
643 
 
1287 mateusz.vi 644 
  _dos_close(fd);
645 
 
1321 mateusz.vi 646 
  SKIPLOADING:
647 
 
1320 mateusz.vi 648 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
1339 mateusz.vi 649 
  if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
650 
  db_rewind(db);
1320 mateusz.vi 651 
 
1346 mateusz.vi 652 
  return(0);
1339 mateusz.vi 653 
 
654 
  IOERR:
655 
  _dos_close(fd);
1346 mateusz.vi 656 
  return(2);
1287 mateusz.vi 657 
}
658 
 
659 
 
1356 mateusz.vi 660 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
661 
 * of argc and argv, saves some 330 bytes of binary size
662 
 * returns non-zero on error */
663 
static int parseargv(struct file *dbarr) {
664 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
665 
  unsigned short count = 0;
666 
  char *arg;
667 
  unsigned short lastarg = 0;
1359 mateusz.vi 668 
  int err;
1356 mateusz.vi 669 
 
670 
  while (!lastarg) {
671 
    /* jump to nearest arg */
672 
    while (*tail == ' ') {
673 
      *tail = 0;
674 
      tail++;
675 
    }
676 
 
677 
    if (*tail == '\r') {
678 
      *tail = 0;
679 
      break;
680 
    }
681 
 
682 
    arg = tail;
683 
 
684 
    /* jump to next delimiter */
685 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
686 
 
687 
    /* if \r then remember this is the last arg */
688 
    if (*tail == '\r') lastarg = 1;
689 
 
690 
    *tail = 0;
691 
    tail++;
692 
 
693 
    /* look at the arg now */
694 
    if (*arg == '/') {
1412 mateusz.vi 695 
      if (arg[1] == 't') { /* /t = do not expand tabs */
696 
        glob_tablessmode = 1;
697 
 
698 
      } else if (arg[1] == 'm') { /* /m = force mono mode */
699 
        glob_monomode = 1;
700 
 
701 
      } else {  /* help screen */
1419 mateusz.vi 702 
        mdr_coutraw_str(svarlang_str(1,3)); /* Sved, the SvarDOS editor */
1412 mateusz.vi 703 
        mdr_coutraw_str(" [");
1419 mateusz.vi 704 
        mdr_coutraw_str(svarlang_str(1,4)); /* ver */
1412 mateusz.vi 705 
        mdr_coutraw_puts(" " PVER "]");
706 
        mdr_coutraw_puts("Copyright (C) " PDATE " Mateusz Viste");
707 
        mdr_coutraw_crlf();
1433 mateusz.vi 708 
        mdr_coutraw_str("sved [/m] [/t] ");
1412 mateusz.vi 709 
        mdr_coutraw_puts(svarlang_str(1,1)); /* args syntax */
710 
        mdr_coutraw_crlf();
711 
        mdr_coutraw_puts(svarlang_str(1,10)); /* /m */
712 
        mdr_coutraw_puts(svarlang_str(1,11)); /* /t */
713 
        return(-1);
1387 mateusz.vi 714 
      }
1412 mateusz.vi 715 
      continue;
1356 mateusz.vi 716 
    }
717 
 
718 
    /* looks to be a filename */
719 
    if (count == 10) {
1420 mateusz.vi 720 
      mdr_coutraw_puts(svarlang_str(0,12)); /* too many files */
721 
      return(-1);
1356 mateusz.vi 722 
    }
723 
 
724 
    /* try loading it */
1387 mateusz.vi 725 
    mdr_coutraw_str(svarlang_str(1,2));
726 
    mdr_coutraw_char(' ');
1356 mateusz.vi 727 
    mdr_coutraw_puts(arg);
728 
    err = loadfile(&(dbarr[count]), arg);
729 
    if (err) {
730 
      if (err == 1) { /* file not found */
1396 mateusz.vi 731 
        if ((count == 0) && (lastarg != 0)) { /* a 'file not found' is fine if only one file was given */
732 
          memcpy(dbarr[count].fname, arg, strlen(arg) + 1);
733 
          err = 0;
734 
        } else {
735 
          err = 11;
736 
        }
1356 mateusz.vi 737 
      } else { /* general error */
738 
        err = 10;
739 
      }
1396 mateusz.vi 740 
      if (err) {
741 
        mdr_coutraw_puts(svarlang_str(0,err));
742 
        return(-1);
743 
      }
1356 mateusz.vi 744 
    }
745 
    count++;
746 
  }
747 
 
748 
  return(0);
749 
}
750 
 
751 
 
1332 mateusz.vi 752 
static int savefile(const struct file *db, const char *newfname) {
1311 mateusz.vi 753 
  int fd;
754 
  const struct line far *l;
1417 mateusz.vi 755 
  unsigned int bytes;
1313 mateusz.vi 756 
  unsigned char eollen;
757 
  unsigned char eolbuf[2];
1332 mateusz.vi 758 
  int errflag = 0;
1313 mateusz.vi 759 
 
1332 mateusz.vi 760 
  /* either create a new file if newfname provided, or... */
761 
  if (newfname) {
762 
    if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
763 
  } else { /* ...open db->fname */
764 
    if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
1311 mateusz.vi 765 
  }
766 
 
767 
  l = db->cursor;
768 
  while (l->prev) l = l->prev;
769 
 
1313 mateusz.vi 770 
  /* preset line terminators */
771 
  if (db->lfonly) {
772 
    eolbuf[0] = '\n';
773 
    eollen = 1;
774 
  } else {
775 
    eolbuf[0] = '\r';
776 
    eolbuf[1] = '\n';
777 
    eollen = 2;
778 
  }
779 
 
1311 mateusz.vi 780 
  while (l) {
1324 mateusz.vi 781 
    /* do not write the last empty line, it is only useful for edition */
782 
    if (l->len != 0) {
1332 mateusz.vi 783 
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
1324 mateusz.vi 784 
    } else if (l->next == NULL) {
785 
      break;
786 
    }
1332 mateusz.vi 787 
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
1311 mateusz.vi 788 
    l = l->next;
789 
  }
790 
 
1332 mateusz.vi 791 
  errflag |= _dos_close(fd);
1330 mateusz.vi 792 
 
1332 mateusz.vi 793 
  return(errflag);
1311 mateusz.vi 794 
}
795 
 
796 
 
1327 mateusz.vi 797 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1340 mateusz.vi 798 
  if (curline_resize(db, db->cursor->len + len) == 0) {
1317 mateusz.vi 799 
    unsigned short off = db->xoffset + db->cursorposx;
1393 mateusz.vi 800 
    db->modflag = 1;
1317 mateusz.vi 801 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
802 
    db->cursor->len += len;
1327 mateusz.vi 803 
    uidirty.from = db->cursorposy;
804 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 805 
    while (len--) {
806 
      db->cursor->payload[off++] = *databuf;
807 
      databuf++;
1327 mateusz.vi 808 
      cursor_right(db);
1317 mateusz.vi 809 
    }
810 
  }
811 
}
812 
 
813 
 
1343 mateusz.vi 814 
/* recompute db->curline by counting nodes in linked list */
815 
static void recompute_curline(struct file *db) {
816 
  const struct line far *l = db->cursor;
817 
 
818 
  db->curline = 0;
819 
  while (l->prev != NULL) {
820 
    db->curline += 1;
821 
    l = l->prev;
822 
  }
823 
}
824 
 
825 
 
1354 mateusz.vi 826 
enum MENU_ACTION {
1393 mateusz.vi 827 
  MENU_NONE   = 0,
828 
  MENU_OPEN   = 1,
829 
  MENU_SAVE   = 2,
830 
  MENU_SAVEAS = 3,
831 
  MENU_CLOSE  = 4,
832 
  MENU_CHGEOL = 5,
1418 mateusz.vi 833 
  MENU_QUIT   = 6
1354 mateusz.vi 834 
};
835 
 
836 
static enum MENU_ACTION ui_menu(void) {
837 
  unsigned short i, curchoice, attr, x, slen;
1393 mateusz.vi 838 
  unsigned short xorigin, yorigin;
1354 mateusz.vi 839 
 
840 
  /* find out the longest string */
841 
  slen = 0;
1355 mateusz.vi 842 
  for (i = MENU_OPEN; i <= MENU_QUIT; i++) {
1354 mateusz.vi 843 
    x = strlen(svarlang_str(8, i));
844 
    if (x > slen) slen = x;
845 
  }
846 
 
1393 mateusz.vi 847 
  /* calculate where to draw the menu on screen */
848 
  xorigin = (screenw - (slen + 5)) / 2;
1395 mateusz.vi 849 
  yorigin = (screenh - (MENU_QUIT - MENU_OPEN + 6)) / 2;
1393 mateusz.vi 850 
 
1395 mateusz.vi 851 
  /* */
852 
  uidirty.from = yorigin;
853 
  uidirty.to = 0xff;
854 
  uidirty.statusbar = 1;
855 
 
856 
  /* hide the cursor */
857 
  mdr_cout_cursor_hide();
858 
 
1355 mateusz.vi 859 
  curchoice = MENU_OPEN;
1354 mateusz.vi 860 
  for (;;) {
861 
    /* render menu */
1393 mateusz.vi 862 
    for (i = MENU_NONE; i <= MENU_QUIT + 1; i++) {
863 
      mdr_cout_char_rep(yorigin + i, xorigin, ' ', SCHEME_MENU, slen+4);
1354 mateusz.vi 864 
      if (i == curchoice) {
865 
        attr = SCHEME_MENU_CUR;
1415 mateusz.vi 866 
        mdr_cout_char_rep(yorigin + i, xorigin + 1, ' ', SCHEME_MENU_SEL, slen + 2);
1354 mateusz.vi 867 
      } else {
868 
        attr = SCHEME_MENU;
869 
      }
1416 mateusz.vi 870 
      mdr_cout_str(yorigin + i, xorigin + 2, svarlang_str(8, i), attr, slen);
1354 mateusz.vi 871 
    }
872 
    /* wait for key */
1410 mateusz.vi 873 
    switch (mdr_dos_getkey2()) {
1354 mateusz.vi 874 
      case 0x150: /* down */
875 
        if (curchoice == MENU_QUIT) {
1355 mateusz.vi 876 
          curchoice = MENU_OPEN;
1354 mateusz.vi 877 
        } else {
878 
          curchoice++;
879 
        }
880 
        break;
881 
      case 0x148: /* up */
1355 mateusz.vi 882 
        if (curchoice == MENU_OPEN) {
1354 mateusz.vi 883 
          curchoice = MENU_QUIT;
884 
        } else {
885 
          curchoice--;
886 
        }
887 
        break;
1395 mateusz.vi 888 
      default:
889 
        curchoice = MENU_NONE;
890 
        /* FALLTHRU */
891 
      case '\r': /* ENTER */
892 
        mdr_cout_cursor_show();
893 
        return(curchoice);
1354 mateusz.vi 894 
    }
895 
  }
896 
}
897 
 
898 
 
1426 mateusz.vi 899 
static struct file *select_slot(struct file *dbarr, unsigned char curfile) {
1355 mateusz.vi 900 
  uidirty.from = 0;
901 
  uidirty.to = 0xff;
902 
  uidirty.statusbar = 1;
903 
 
904 
  dbarr = &(dbarr[curfile]);
1415 mateusz.vi 905 
  /* force redraw now, because the main() routine might not if this is exit
906 
   * time and we want to show the user which file has unsaved changes */
1435 mateusz.vi 907 
  ui_statusbar(dbarr, curfile);
1355 mateusz.vi 908 
  ui_refresh(dbarr);
909 
  return(dbarr);
910 
}
911 
 
912 
 
1347 mateusz.vi 913 
/* main returns nothing, ie. sved always exits with a zero exit code
914 
 * (this saves 20 bytes of executable footprint) */
915 
void main(void) {
1355 mateusz.vi 916 
  static struct file dbarr[10];
1426 mateusz.vi 917 
  unsigned char curfile;
1355 mateusz.vi 918 
  struct file *db = dbarr; /* visible file is the first slot by default */
1410 mateusz.vi 919 
  struct line far *clipboard = NULL;
1414 mateusz.vi 920 
  unsigned char original_breakflag;
1275 mateusz.vi 921 
 
1418 mateusz.vi 922 
  { /* load NLS resource */
1364 mateusz.vi 923 
    unsigned short i = 0;
924 
    const char far *selfptr;
925 
    char self[128], lang[8];
926 
    selfptr = mdr_dos_selfexe();
927 
    if (selfptr != NULL) {
928 
      do {
929 
        self[i] = selfptr[i];
930 
      } while (self[i++] != 0);
931 
      svarlang_autoload_exepath(self, mdr_dos_getenv(lang, "LANG", sizeof(lang)));
932 
    }
1307 mateusz.vi 933 
  }
1282 mateusz.vi 934 
 
1355 mateusz.vi 935 
  /* preload all slots with empty files */
936 
  for (curfile = 9;; curfile--) {
1418 mateusz.vi 937 
    loadfile(&(dbarr[curfile]), NULL);
1355 mateusz.vi 938 
    if (curfile == 0) break;
939 
  }
940 
 
1356 mateusz.vi 941 
  /* parse argv (and load files, if any passed on) */
942 
  if (parseargv(dbarr) != 0) return;
1282 mateusz.vi 943 
 
1412 mateusz.vi 944 
  if ((mdr_cout_init(&screenw, &screenh) != 0) && (glob_monomode == 0)) {
1333 mateusz.vi 945 
    /* load color scheme if mdr_cout_init returns a color flag */
946 
    SCHEME_TEXT = 0x17;
1354 mateusz.vi 947 
    SCHEME_MENU = 0x70;
1388 mateusz.vi 948 
    SCHEME_MENU_CUR = 0x6f;
949 
    SCHEME_MENU_SEL = 0x66;
1333 mateusz.vi 950 
    SCHEME_STBAR1 = 0x70;
951 
    SCHEME_STBAR2 = 0x78;
1392 mateusz.vi 952 
    SCHEME_STBAR3 = 0x3f;
1333 mateusz.vi 953 
    SCHEME_SCROLL = 0x70;
1388 mateusz.vi 954 
    SCHEME_MSG = 0x6f;
1333 mateusz.vi 955 
    SCHEME_ERR = 0x4f;
956 
  }
1427 mateusz.vi 957 
  screenlastrow = screenh - 1;
958 
  screenlastcol = screenw - 1;
1275 mateusz.vi 959 
 
1414 mateusz.vi 960 
  /* instruct DOS to stop detecting CTRL+C because user needs it for
961 
   * copy/paste operations. also remember the original status of the BREAK
962 
   * flag so I can restore it as it was before quitting. */
963 
  original_breakflag = mdr_dos_ctrlc_disable();
1410 mateusz.vi 964 
 
1275 mateusz.vi 965 
  for (;;) {
966 
    int k;
967 
 
1362 mateusz.vi 968 
    /* add an extra empty line if cursor is on last line and this line is not empty */
969 
    if ((db->cursor->next == NULL) && (db->cursor->len != 0)) {
970 
      if (line_add(db, NULL, 0) == 0) {
971 
        db->cursor = db->cursor->prev; /* line_add() changes the cursor pointer */
1437 mateusz.vi 972 
        db->curline -= 1;
1362 mateusz.vi 973 
      }
974 
    }
975 
 
1327 mateusz.vi 976 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 977 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 978 
 
1392 mateusz.vi 979 
    ui_refresh(db);
980 
 
1436 mateusz.vi 981 
    if ((uidirty.statusbar != 0) || (db->modflagprev != db->modflag) || (db->curline_prev != db->curline)) {
1435 mateusz.vi 982 
      ui_statusbar(db, curfile);
1342 mateusz.vi 983 
      uidirty.statusbar = 0;
1355 mateusz.vi 984 
      db->modflagprev = db->modflag;
1436 mateusz.vi 985 
      db->curline_prev = db->curline;
1342 mateusz.vi 986 
    }
1328 mateusz.vi 987 
#ifdef DBG_LINENUM
988 
      {
989 
        char ddd[10];
990 
        db->curline += 1;
991 
        ddd[0] = '0' + db->curline / 100;
992 
        ddd[1] = '0' + (db->curline % 100) / 10;
993 
        ddd[2] = '0' + (db->curline % 10);
994 
        db->curline -= 1;
995 
        ddd[3] = '/';
996 
        ddd[4] = '0' + db->totlines / 100;
997 
        ddd[5] = '0' + (db->totlines % 100) / 10;
998 
        ddd[6] = '0' + (db->totlines % 10);
999 
        ddd[7] = 0;
1333 mateusz.vi 1000 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 1001 
      }
1002 
#endif
1275 mateusz.vi 1003 
 
1410 mateusz.vi 1004 
    k = mdr_dos_getkey2();
1282 mateusz.vi 1005 
 
1275 mateusz.vi 1006 
    if (k == 0x150) { /* down */
1327 mateusz.vi 1007 
      cursor_down(db);
1275 mateusz.vi 1008 
 
1009 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 1010 
      cursor_up(db);
1275 mateusz.vi 1011 
 
1012 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 1013 
      cursor_right(db);
1275 mateusz.vi 1014 
 
1015 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 1016 
      cursor_left(db);
1275 mateusz.vi 1017 
 
1282 mateusz.vi 1018 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 1019 
      unsigned char dist = db->cursorposy + screenh - 1;
1020 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
1021 
        db->cursor = db->cursor->prev;
1022 
        dist--;
1023 
      }
1024 
      if (dist != 0) {
1025 
        db->cursorposy = 0;
1026 
        db->cursorposx = 0;
1027 
      } else {
1028 
        dist = db->cursorposy;
1029 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
1030 
      }
1031 
      uidirty.from = 0;
1032 
      uidirty.to = 0xff;
1343 mateusz.vi 1033 
      recompute_curline(db);
1282 mateusz.vi 1034 
 
1035 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 1036 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
1037 
      while ((dist != 0) && (db->cursor->next != NULL)) {
1038 
        db->cursor = db->cursor->next;
1039 
        dist--;
1040 
      }
1041 
      if (dist != 0) {
1042 
        db->cursorposy = screenh - 2;
1043 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
1044 
        db->cursorposx = 0;
1045 
      } else {
1046 
        dist = screenh - 2 - db->cursorposy;
1047 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
1048 
      }
1049 
      uidirty.from = 0;
1050 
      uidirty.to = 0xff;
1343 mateusz.vi 1051 
      recompute_curline(db);
1282 mateusz.vi 1052 
 
1053 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 1054 
       cursor_home(db);
1282 mateusz.vi 1055 
 
1056 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 1057 
       cursor_eol(db);
1282 mateusz.vi 1058 
 
1275 mateusz.vi 1059 
    } else if (k == 0x1B) { /* ESC */
1354 mateusz.vi 1060 
      int quitnow = 0;
1394 mateusz.vi 1061 
      char fname[64];
1354 mateusz.vi 1062 
      int saveflag = 0;
1393 mateusz.vi 1063 
      enum MENU_ACTION ui_action;
1275 mateusz.vi 1064 
 
1392 mateusz.vi 1065 
      /* collect the exact menu action and clear the screen */
1066 
      ui_action = ui_menu();
1067 
      ui_refresh(db);
1354 mateusz.vi 1068 
 
1392 mateusz.vi 1069 
      switch (ui_action) {
1070 
 
1354 mateusz.vi 1071 
        case MENU_NONE:
1072 
          break;
1073 
 
1074 
        case MENU_OPEN:
1075 
          /* display a warning if unsaved changes are pending */
1076 
          if (db->modflag != 0) ui_msg(svarlang_str(0,4), svarlang_str(0,8), SCHEME_MSG);
1077 
 
1078 
          /* ask for filename */
1079 
          ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
1080 
          if (fname[0] != 0) {
1359 mateusz.vi 1081 
            int err;
1354 mateusz.vi 1082 
            err = loadfile(db, fname);
1083 
            if (err != 0) {
1084 
              if (err == 1) {
1085 
                ui_msg(svarlang_str(0,11), NULL, SCHEME_ERR); /* file not found */
1086 
              } else {
1087 
                ui_msg(svarlang_str(0,10), NULL, SCHEME_ERR);  /* ERROR */
1088 
              }
1089 
              mdr_bios_tickswait(44); /* 3s */
1418 mateusz.vi 1090 
              loadfile(db, NULL);
1354 mateusz.vi 1091 
            }
1092 
          }
1393 mateusz.vi 1093 
          uidirty.from = 0;
1094 
          uidirty.to = 0xff;
1095 
          uidirty.statusbar = 1;
1354 mateusz.vi 1096 
          break;
1097 
 
1098 
        case MENU_SAVEAS:
1099 
          saveflag = 1;
1100 
          /* FALLTHRU */
1101 
        case MENU_SAVE:
1102 
          if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
1103 
            ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
1104 
            if (*fname == 0) break;
1105 
            saveflag = savefile(db, fname);
1106 
            if (saveflag == 0) memcpy(db->fname, fname, sizeof(fname));
1107 
          } else {
1108 
            saveflag = savefile(db, NULL);
1109 
          }
1110 
 
1395 mateusz.vi 1111 
          mdr_cout_cursor_hide();
1112 
 
1354 mateusz.vi 1113 
          if (saveflag == 0) {
1114 
            db->modflag = 0;
1115 
            ui_msg(svarlang_str(0, 2), NULL, SCHEME_MSG);
1116 
            mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
1117 
          } else {
1429 mateusz.vi 1118 
            ui_msg(svarlang_str(0, 10), NULL, SCHEME_ERR);
1354 mateusz.vi 1119 
            mdr_bios_tickswait(36); /* 2s */
1120 
          }
1395 mateusz.vi 1121 
          mdr_cout_cursor_show();
1354 mateusz.vi 1122 
          break;
1123 
 
1355 mateusz.vi 1124 
        case MENU_CLOSE:
1125 
          if (ui_confirm_if_unsaved(db) == 0) {
1418 mateusz.vi 1126 
            loadfile(db, NULL);
1355 mateusz.vi 1127 
          }
1128 
          uidirty.from = 0;
1129 
          uidirty.to = 0xff;
1130 
          uidirty.statusbar = 1;
1131 
          break;
1132 
 
1354 mateusz.vi 1133 
        case MENU_CHGEOL:
1393 mateusz.vi 1134 
          db->modflag = 1;
1354 mateusz.vi 1135 
          db->lfonly ^= 1;
1136 
          break;
1137 
 
1138 
        case MENU_QUIT:
1355 mateusz.vi 1139 
          quitnow = 1;
1140 
          for (curfile = 0; curfile < 10; curfile++) {
1141 
            if (dbarr[curfile].modflag) {
1142 
              db = select_slot(dbarr, curfile);
1143 
              if (ui_confirm_if_unsaved(db) != 0) quitnow = 0;
1144 
            }
1145 
          }
1354 mateusz.vi 1146 
          break;
1147 
      }
1148 
 
1149 
      if (quitnow) break;
1150 
 
1289 mateusz.vi 1151 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 1152 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 1153 
      /* add a new line */
1328 mateusz.vi 1154 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1393 mateusz.vi 1155 
        db->modflag = 1;
1328 mateusz.vi 1156 
        db->cursor = db->cursor->prev; /* back to original line */
1427 mateusz.vi 1157 
        db->curline -= 1;
1289 mateusz.vi 1158 
        /* trim the line above */
1328 mateusz.vi 1159 
        db->cursor->len = off;
1289 mateusz.vi 1160 
        /* move cursor to the (new) line below */
1328 mateusz.vi 1161 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 1162 
        uidirty.to = 0xff;
1328 mateusz.vi 1163 
        cursor_down(db);
1164 
        cursor_home(db);
1289 mateusz.vi 1165 
      } else {
1166 
        /* ERROR: OUT OF MEMORY */
1167 
      }
1168 
 
1292 mateusz.vi 1169 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 1170 
      del(db);
1292 mateusz.vi 1171 
 
1302 mateusz.vi 1172 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 1173 
      bkspc(db);
1302 mateusz.vi 1174 
 
1308 mateusz.vi 1175 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 1176 
      char c = k;
1327 mateusz.vi 1177 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 1178 
 
1317 mateusz.vi 1179 
    } else if (k == 0x009) { /* TAB */
1412 mateusz.vi 1180 
      if (glob_tablessmode == 0) {
1181 
        insert_in_line(db, "        ", 8);
1182 
      } else {
1183 
        insert_in_line(db, "\t", 1);
1184 
      }
1317 mateusz.vi 1185 
 
1355 mateusz.vi 1186 
    } else if ((k >= 0x13b) && (k <= 0x144)) { /* F1..F10 */
1187 
      curfile = k - 0x13b;
1188 
      db = select_slot(dbarr, curfile);
1309 mateusz.vi 1189 
 
1325 mateusz.vi 1190 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
1191 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
1192 
      for (;;) {
1193 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
1194 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 1195 
        cursor_right(db);
1325 mateusz.vi 1196 
      }
1197 
      /* now skip to next non-space or end of file */
1198 
      for (;;) {
1327 mateusz.vi 1199 
        cursor_right(db);
1325 mateusz.vi 1200 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1201 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
1202 
      }
1203 
 
1204 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 1205 
      cursor_left(db);
1325 mateusz.vi 1206 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
1207 
      for (;;) {
1208 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
1209 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 1210 
        cursor_left(db);
1325 mateusz.vi 1211 
      }
1212 
      /* now skip to next space or start of file */
1213 
      for (;;) {
1327 mateusz.vi 1214 
        cursor_left(db);
1325 mateusz.vi 1215 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 1216 
          cursor_right(db);
1325 mateusz.vi 1217 
          break;
1218 
        }
1219 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
1220 
      }
1221 
 
1410 mateusz.vi 1222 
    } else if ((k == 0x003) || (k == 0x018)) { /* CTRL+C or CTRL+X */
1223 
      /* free clipboard if anything in it */
1224 
      if (clipboard != NULL) line_free(clipboard);
1225 
 
1226 
      /* copy cursor line to clipboard */
1227 
      clipboard = line_calloc(db->cursor->len);
1228 
      if (clipboard == NULL) {
1229 
        ui_msg(svarlang_str(0, 10), NULL, SCHEME_ERR); /* ERROR */
1230 
        mdr_bios_tickswait(18); /* 1s */
1231 
      } else {
1427 mateusz.vi 1232 
        mdr_cout_char_rep(db->cursorposy, 0, ' ', ((SCHEME_TEXT >> 4) | (SCHEME_TEXT << 4)) & 0xff, screenlastcol);
1410 mateusz.vi 1233 
        uidirty.from = db->cursorposy;
1234 
        uidirty.to = db->cursorposy;
1235 
        if (db->cursor->len != 0) {
1236 
          _fmemmove(clipboard->payload, db->cursor->payload, db->cursor->len);
1237 
          clipboard->len = db->cursor->len;
1238 
        }
1239 
        mdr_bios_tickswait(2); /* ca 100ms */
1240 
 
1241 
        /* if this is about cutting the line (CTRL+X) then delete cur line */
1242 
        if ((k == 0x018) && ((db->cursor->next != NULL) || (db->cursor->prev != NULL))) {
1243 
          if (db->cursor->next) db->cursor->next->prev = db->cursor->prev;
1244 
          if (db->cursor->prev) db->cursor->prev->next = db->cursor->next;
1245 
          clipboard->prev = db->cursor;
1246 
          if (db->cursor->next) {
1247 
            db->cursor = db->cursor->next;
1248 
          } else {
1249 
            cursor_up(db);
1250 
          }
1251 
          line_free(clipboard->prev);
1423 mateusz.vi 1252 
          db->totlines -= 1;
1410 mateusz.vi 1253 
          uidirty.from = 0;
1254 
          uidirty.to = 0xff;
1412 mateusz.vi 1255 
          recompute_curline(db);
1410 mateusz.vi 1256 
        }
1257 
      }
1258 
 
1420 mateusz.vi 1259 
    } else if ((k == 0x016) && (clipboard != NULL)) { /* CTRL+V */
1260 
      if (line_add(db, clipboard->payload, clipboard->len) != 0) {
1261 
        ui_msg(svarlang_str(0, 10), NULL, SCHEME_ERR); /* ERROR */
1262 
        mdr_bios_tickswait(18); /* 1s */
1263 
      } else {
1264 
        /* rewire the linked list so the new line is on top of the previous one */
1265 
        clipboard->prev = db->cursor->prev;
1266 
        /* remove prev node from list */
1267 
        db->cursor->prev = db->cursor->prev->prev;
1268 
        if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor;
1269 
        /* insert the node after cursor now */
1270 
        clipboard->prev->next = db->cursor->next;
1271 
        if (db->cursor->next != NULL) db->cursor->next->prev = clipboard->prev;
1272 
        clipboard->prev->prev = db->cursor;
1273 
        db->cursor->next = clipboard->prev;
1274 
        cursor_down(db);
1410 mateusz.vi 1275 
      }
1276 
      uidirty.from = 0;
1277 
      uidirty.to = 0xff;
1412 mateusz.vi 1278 
      recompute_curline(db);
1410 mateusz.vi 1279 
 
1333 mateusz.vi 1280 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 1281 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
1282 
      char buff[4];
1283 
      const char *HEX = "0123456789ABCDEF";
1284 
      buff[0] = HEX[(k >> 8) & 15];
1285 
      buff[1] = HEX[(k >> 4) & 15];
1286 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 1287 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
1288 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1410 mateusz.vi 1289 
      mdr_dos_getkey2();
1275 mateusz.vi 1290 
      break;
1333 mateusz.vi 1291 
#endif
1275 mateusz.vi 1292 
    }
1293 
  }
1294 
 
1295 
  mdr_cout_close();
1296 
 
1414 mateusz.vi 1297 
  /* restore the DOS BREAK flag if it was originally set */
1298 
  if (original_breakflag != 0) mdr_dos_ctrlc_enable();
1299 
 
1320 mateusz.vi 1300 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 1301 
 
1347 mateusz.vi 1302 
  return;
1275 mateusz.vi 1303 
}