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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 */
1537 mateusz.vi 28 
#include <stdlib.h>   /* _osmajor symbol provided by Open Watcom */
1275 mateusz.vi 29 
#include <string.h>
1545 bernd.boec 30 
#include <strings.h>
1275 mateusz.vi 31 
 
1312 mateusz.vi 32 
#include "mdr\bios.h"
1275 mateusz.vi 33 
#include "mdr\cout.h"
1307 mateusz.vi 34 
#include "mdr\dos.h"
1275 mateusz.vi 35 
 
1282 mateusz.vi 36 
#include "svarlang\svarlang.h"
37 
 
1326 mateusz.vi 38 
 
1537 mateusz.vi 39 
#define PVER "2023.5"
1356 mateusz.vi 40 
#define PDATE "2023"
41 
 
1326 mateusz.vi 42 
/*****************************************************************************
43 
 * global variables and definitions                                          *
44 
 *****************************************************************************/
45 
 
1275 mateusz.vi 46 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
1333 mateusz.vi 47 
static unsigned char SCHEME_TEXT   = 0x07,
1354 mateusz.vi 48 
                     SCHEME_MENU   = 0x70,
49 
                     SCHEME_MENU_CUR= 0x0f,
50 
                     SCHEME_MENU_SEL= 0x00,
1333 mateusz.vi 51 
                     SCHEME_STBAR1 = 0x70,
1358 mateusz.vi 52 
                     SCHEME_STBAR2 = 0x70, /* greyed out information */
53 
                     SCHEME_STBAR3 = 0x70, /* query */
1333 mateusz.vi 54 
                     SCHEME_SCROLL = 0x70,
55 
                     SCHEME_MSG    = 0x70,
1358 mateusz.vi 56 
                     SCHEME_ERR    = 0x70;
1327 mateusz.vi 57 
 
1427 mateusz.vi 58 
static unsigned char screenw, screenh, screenlastrow, screenlastcol;
1412 mateusz.vi 59 
static unsigned char glob_monomode, glob_tablessmode;
1275 mateusz.vi 60 
 
1548 mateusz.vi 61 
static char buff[512]; /* short lived buffer for whatever needed */
62 
 
1327 mateusz.vi 63 
static struct {
64 
    unsigned char from;
65 
    unsigned char to;
1342 mateusz.vi 66 
    unsigned char statusbar;
67 
} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */
1327 mateusz.vi 68 
 
1275 mateusz.vi 69 
#define SCROLL_CURSOR 0xB1
70 
 
71 
struct line {
1430 mateusz.vi 72 
  unsigned short len;
73 
  struct line far *next;
1288 mateusz.vi 74 
  struct line far *prev;
1275 mateusz.vi 75 
  char payload[1];
76 
};
77 
 
1315 mateusz.vi 78 
struct file {
1288 mateusz.vi 79 
  struct line far *cursor;
1275 mateusz.vi 80 
  unsigned short xoffset;
1348 mateusz.vi 81 
  unsigned short cursorposx;
82 
  unsigned short cursorposy;
1328 mateusz.vi 83 
  unsigned short totlines;
84 
  unsigned short curline;
1436 mateusz.vi 85 
  unsigned short curline_prev;
1330 mateusz.vi 86 
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
87 
  char modflag;  /* non-zero if file has been modified since last save */
1355 mateusz.vi 88 
  char modflagprev;
1549 mateusz.vi 89 
  char slotid; /* 0..9 */
1332 mateusz.vi 90 
  char fname[128];
1275 mateusz.vi 91 
};
92 
 
93 
 
1326 mateusz.vi 94 
/*****************************************************************************
95 
 * functions                                                                 *
96 
 *****************************************************************************/
97 
 
1339 mateusz.vi 98 
static struct line far *line_calloc(unsigned short siz) {
1342 mateusz.vi 99 
  struct line far *res;
1339 mateusz.vi 100 
  unsigned int seg;
1461 mateusz.vi 101 
 
1341 mateusz.vi 102 
  if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);
1461 mateusz.vi 103 
 
1342 mateusz.vi 104 
  res = MK_FP(seg, 0);
1461 mateusz.vi 105 
  res->len = 0;
106 
  res->next = NULL;
107 
  res->prev = NULL;
108 
 
109 
  return(res);
1339 mateusz.vi 110 
}
111 
 
112 
 
113 
static void line_free(struct line far *ptr) {
114 
  _dos_freemem(FP_SEG(ptr));
115 
}
116 
 
117 
 
1550 mateusz.vi 118 
static int curline_resize(struct file *db, unsigned short newsiz) {
1339 mateusz.vi 119 
  unsigned int maxavail;
120 
  struct line far *newptr;
121 
 
1341 mateusz.vi 122 
  /* try resizing the block (much faster) */
123 
  if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);
1339 mateusz.vi 124 
 
125 
  /* create a new block and copy data over */
126 
  newptr = line_calloc(newsiz);
1340 mateusz.vi 127 
  if (newptr == NULL) return(-1);
128 
  _fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
129 
 
130 
  /* rewire the linked list */
131 
  db->cursor = newptr;
132 
  if (newptr->next) newptr->next->prev = newptr;
133 
  if (newptr->prev) newptr->prev->next = newptr;
134 
 
135 
  return(0);
1339 mateusz.vi 136 
}
137 
 
138 
 
1328 mateusz.vi 139 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 140 
 * returns non-zero on error */
1328 mateusz.vi 141 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 142 
  struct line far *l;
1275 mateusz.vi 143 
 
1339 mateusz.vi 144 
  l = line_calloc(slen);
1287 mateusz.vi 145 
  if (l == NULL) return(-1);
146 
 
1275 mateusz.vi 147 
  l->prev = db->cursor;
148 
  if (db->cursor) {
149 
    l->next = db->cursor->next;
150 
    db->cursor->next = l;
151 
    l->next->prev = l;
152 
  }
153 
  db->cursor = l;
1342 mateusz.vi 154 
  if (slen > 0) {
155 
    _fmemmove(l->payload, line, slen);
156 
    l->len = slen;
157 
  }
1287 mateusz.vi 158 
 
1328 mateusz.vi 159 
  db->totlines += 1;
160 
  db->curline += 1;
161 
 
1287 mateusz.vi 162 
  return(0);
1275 mateusz.vi 163 
}
164 
 
165 
 
1348 mateusz.vi 166 
static void ui_getstring(const char *query, char *s, unsigned short maxlen) {
167 
  unsigned short len = 0;
1544 mateusz.vi 168 
  unsigned char x;
1332 mateusz.vi 169 
  int k;
170 
 
171 
  if (maxlen == 0) return;
172 
  maxlen--; /* make room for the nul terminator */
173 
 
174 
  /* print query string */
1544 mateusz.vi 175 
  x = mdr_cout_str(screenlastrow, 0, query, SCHEME_STBAR3, 40);
176 
  mdr_cout_char_rep(screenlastrow, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 177 
 
178 
  for (;;) {
1544 mateusz.vi 179 
    mdr_cout_locate(screenlastrow, x + len);
1410 mateusz.vi 180 
    k = mdr_dos_getkey2();
1332 mateusz.vi 181 
 
1345 mateusz.vi 182 
    switch (k) {
183 
      case 0x1b: /* ESC */
184 
        s[0] = 0;
185 
        return;
186 
      case '\r':
187 
        s[len] = 0;
188 
        return;
189 
      case 0x08: /* BKSPC */
190 
        if (len > 0) {
191 
          len--;
1544 mateusz.vi 192 
          mdr_cout_char(screenlastrow, x + len, ' ', SCHEME_STBAR3);
1345 mateusz.vi 193 
        }
194 
        break;
195 
      default:
196 
        if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
1544 mateusz.vi 197 
          mdr_cout_char(screenlastrow, x + len, k, SCHEME_STBAR3);
1345 mateusz.vi 198 
          s[len++] = k;
199 
        }
1332 mateusz.vi 200 
    }
1345 mateusz.vi 201 
  }
1332 mateusz.vi 202 
 
203 
}
204 
 
205 
 
1324 mateusz.vi 206 
/* append a nul-terminated string to line at cursor position */
1550 mateusz.vi 207 
static int line_append(struct file *f, const char *buf, unsigned short len) {
1427 mateusz.vi 208 
  if (sizeof(struct line) + f->cursor->len + len < len) goto ERR; /* overflow check */
209 
  if (curline_resize(f, f->cursor->len + len) != 0) goto ERR;
210 
 
1337 mateusz.vi 211 
  _fmemmove(f->cursor->payload + f->cursor->len, buf, len);
1324 mateusz.vi 212 
  f->cursor->len += len;
213 
 
214 
  return(0);
1427 mateusz.vi 215 
  ERR:
216 
  return(-1);
1324 mateusz.vi 217 
}
218 
 
219 
 
1315 mateusz.vi 220 
static void db_rewind(struct file *db) {
1275 mateusz.vi 221 
  if (db->cursor == NULL) return;
222 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 223 
  db->curline = 0;
1275 mateusz.vi 224 
}
225 
 
226 
 
1541 mateusz.vi 227 
/* saves db file, resets db->modflag on success and overwrites the filename
228 
 * field if saveas is not NULL */
229 
static int savefile(struct file *db, const char *saveas) {
1539 mateusz.vi 230 
  int fd = 0;
231 
  const struct line far *l;
232 
  unsigned int bytes;
233 
  unsigned char eollen = 2;
234 
  const unsigned char *eolbuf = "\r\n";
235 
  int errflag = 0;
236 
 
237 
  /* if filename not overloaded then use the fname in db */
238 
  if (saveas == NULL) saveas = db->fname;
239 
 
240 
  _asm {
241 
    push ax
242 
    push cx
243 
    push dx
244 
 
245 
    mov ah, 0x3C    /* create or truncate file */
246 
    xor cx, cx      /* file attributes */
247 
    mov dx, saveas  /* works only in SMALL/TINY mode */
248 
    int 0x21
249 
    jnc DONE
250 
    mov errflag, ax
251 
    DONE:
252 
    mov fd, ax
253 
 
254 
    pop dx
255 
    pop cx
256 
    pop ax
257 
  }
258 
 
259 
  if (errflag != 0) return(-1);
260 
 
261 
  l = db->cursor;
262 
  while (l->prev) l = l->prev;
263 
 
264 
  /* preset line terminators */
265 
  if (db->lfonly) {
266 
    eolbuf++;
267 
    eollen--;
268 
  }
269 
 
270 
  while (l) {
271 
    /* do not write the last empty line, it is only useful for edition */
272 
    if (l->len != 0) {
273 
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
274 
    } else if (l->next == NULL) {
275 
      break;
276 
    }
277 
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
278 
    l = l->next;
279 
  }
280 
 
281 
  errflag |= _dos_close(fd);
282 
 
1541 mateusz.vi 283 
  /* did it all work? */
284 
  if (errflag == 0) {
285 
    db->modflag = 0;
286 
    if (saveas != db->fname) mdr_dos_truename(db->fname, saveas);
287 
  }
288 
 
1539 mateusz.vi 289 
  return(errflag);
290 
}
291 
 
292 
 
1549 mateusz.vi 293 
static void ui_statusbar(const struct file *db) {
1356 mateusz.vi 294 
  const char *s = svarlang_strid(0); /* ESC=MENU */
1348 mateusz.vi 295 
  unsigned short helpcol = screenw - strlen(s);
1440 mateusz.vi 296 
  unsigned short col;
1275 mateusz.vi 297 
 
1425 mateusz.vi 298 
  /* slot number (guaranteed to be 0-9) */
1355 mateusz.vi 299 
  {
300 
    char slot[4] = "#00";
1549 mateusz.vi 301 
    if (db->slotid == 9) {
1425 mateusz.vi 302 
      slot[1] = '1';
303 
    } else {
1549 mateusz.vi 304 
      slot[2] += db->slotid + 1;
1425 mateusz.vi 305 
    }
1427 mateusz.vi 306 
    mdr_cout_str(screenlastrow, 0, slot, SCHEME_STBAR2, 3);
1355 mateusz.vi 307 
  }
1313 mateusz.vi 308 
 
1355 mateusz.vi 309 
  /* fill rest of status bar with background */
1427 mateusz.vi 310 
  mdr_cout_char_rep(screenlastrow, 3, ' ', SCHEME_STBAR1, helpcol - 3);
1355 mateusz.vi 311 
 
1313 mateusz.vi 312 
  /* eol type */
1330 mateusz.vi 313 
  {
314 
    const char *eoltype = "CRLF";
1353 mateusz.vi 315 
    if (db->lfonly) eoltype += 2;
1440 mateusz.vi 316 
    mdr_cout_str(screenlastrow, helpcol - 5, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 317 
  }
1313 mateusz.vi 318 
 
1438 mateusz.vi 319 
  /* line numbers */
1436 mateusz.vi 320 
  {
1438 mateusz.vi 321 
    unsigned short x;
322 
    unsigned char count = 0;
1440 mateusz.vi 323 
    col = helpcol - 7;
1438 mateusz.vi 324 
 
1439 mateusz.vi 325 
    x = db->totlines;
1438 mateusz.vi 326 
    AGAIN:
1436 mateusz.vi 327 
    do {
1439 mateusz.vi 328 
      mdr_cout_char(screenlastrow, col--, '0' + (x % 10), SCHEME_STBAR1);
1436 mateusz.vi 329 
      x /= 10;
330 
    } while (x);
1438 mateusz.vi 331 
    /* redo same exercise, but printing the current line now */
332 
    if (count == 0) {
333 
      count = 1;
1439 mateusz.vi 334 
      mdr_cout_char(screenlastrow, col--, '/', SCHEME_STBAR1);
1438 mateusz.vi 335 
      x = 1 + db->curline;
336 
      goto AGAIN;
337 
    }
1440 mateusz.vi 338 
  }
1438 mateusz.vi 339 
 
1440 mateusz.vi 340 
  /* filename and modflag */
341 
  {
342 
    const char *fn;
343 
    unsigned short x;
344 
    unsigned short maxfnlen = col - 6;
345 
    if (db->fname[0] == 0) {
346 
      fn = svarlang_str(0, 1); /* "UNTITLED" */
347 
    } else {
348 
      /* display filename up to maxfnlen chars */
349 
      fn = db->fname;
350 
      x = strlen(fn);
351 
      if (x > maxfnlen) fn += x - maxfnlen;
352 
    }
353 
    x = mdr_cout_str(screenlastrow, 4, fn, SCHEME_STBAR1, maxfnlen);
354 
    if (db->modflag) mdr_cout_char(screenlastrow, 5 + x, '!', SCHEME_STBAR2);
1436 mateusz.vi 355 
  }
356 
 
1427 mateusz.vi 357 
  mdr_cout_str(screenlastrow, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 358 
}
359 
 
360 
 
1547 mateusz.vi 361 
static void ui_msg(unsigned short msgid1, unsigned short msgid2, unsigned short msgid3, unsigned char attr) {
362 
  unsigned short x, y, maxmsglen, i;
363 
  unsigned short msgcount = 1;
364 
  const char *msg[3];
1331 mateusz.vi 365 
 
1547 mateusz.vi 366 
  msg[0] = svarlang_strid(msgid1);
367 
 
368 
  if (msgid2 != 0) {
369 
    msgcount = 2;
370 
    msg[1] = svarlang_strid(msgid2);
1331 mateusz.vi 371 
  }
1547 mateusz.vi 372 
  if (msgid3 != 0) {
373 
    msgcount = 3;
374 
    msg[2] = svarlang_strid(msgid3);
375 
  }
1331 mateusz.vi 376 
 
1547 mateusz.vi 377 
  /* find longest msg */
378 
  maxmsglen = 0;
379 
  for (i = 0; i < msgcount; i++) {
380 
    y = strlen(msg[i]);
381 
    if (y > maxmsglen) maxmsglen = y;
382 
  }
383 
 
1331 mateusz.vi 384 
  y = (screenh - 6) >> 1;
1547 mateusz.vi 385 
  x = (screenw - maxmsglen - 3) >> 1;
386 
  for (i = y+1+msgcount; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, maxmsglen + 2);
1331 mateusz.vi 387 
  x++;
1345 mateusz.vi 388 
 
1547 mateusz.vi 389 
  for (i = 0; i < msgcount; i++) {
390 
    mdr_cout_str(y+1+i, x, msg[i], attr, maxmsglen);
391 
  }
1312 mateusz.vi 392 
 
1327 mateusz.vi 393 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 394 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 395 
}
396 
 
397 
 
1539 mateusz.vi 398 
/* returns 0 if operation may proceed, non-zero to cancel */
1541 mateusz.vi 399 
static unsigned char ui_confirm_if_unsaved(struct file *db) {
1539 mateusz.vi 400 
  int k;
401 
 
1342 mateusz.vi 402 
  if (db->modflag == 0) return(0);
403 
 
1355 mateusz.vi 404 
  mdr_cout_cursor_hide();
405 
 
1539 mateusz.vi 406 
  /* if file has been modified then ask for confirmation:
407 
   * ENTER        : agree to data loss
408 
   * SPACE        : SAVE file before quit (only if valid filename present)
409 
   * anything else: ABORT */
1547 mateusz.vi 410 
  ui_msg(4, 5, (db->fname[0])?9:8, SCHEME_MSG);
1342 mateusz.vi 411 
 
1539 mateusz.vi 412 
  k = mdr_dos_getkey2();
1355 mateusz.vi 413 
  mdr_cout_cursor_show();
414 
 
1539 mateusz.vi 415 
  /* ENTER = agree to loose unsaved data */
416 
  if (k == '\r') return(0);
417 
 
418 
  /* SPACE = save file and continue */
419 
  if ((k == ' ') && (db->fname[0] != 0) && (savefile(db, NULL) == 0)) return(0);
420 
 
421 
  /* any other key = cancel operation */
422 
  return(1);
1342 mateusz.vi 423 
}
424 
 
425 
 
1327 mateusz.vi 426 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 427 
  unsigned char x;
1310 mateusz.vi 428 
  const struct line far *l;
1316 mateusz.vi 429 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 430 
 
1392 mateusz.vi 431 
  /* quit early if nothing to refresh */
432 
  if (uidirty.from == 0xff) return;
433 
 
1288 mateusz.vi 434 
#ifdef DBG_REFRESH
1282 mateusz.vi 435 
  static char m = 'a';
436 
  m++;
437 
  if (m > 'z') m = 'a';
1288 mateusz.vi 438 
#endif
1282 mateusz.vi 439 
 
1310 mateusz.vi 440 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 441 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 442 
 
1310 mateusz.vi 443 
  /* iterate over lines and redraw whatever needs to be redrawn */
444 
  for (; l != NULL; l = l->next, y++) {
445 
 
446 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 447 
    if (y < uidirty.from) continue;
448 
    if (y > uidirty.to) break;
1282 mateusz.vi 449 
 
1318 mateusz.vi 450 
    x = 0;
1275 mateusz.vi 451 
    if (db->xoffset < l->len) {
1318 mateusz.vi 452 
      unsigned char i, limit;
453 
      if (l->len - db->xoffset < screenw) {
454 
        limit = l->len;
455 
      } else {
1427 mateusz.vi 456 
        limit = db->xoffset + screenlastcol;
1318 mateusz.vi 457 
      }
1333 mateusz.vi 458 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 459 
    }
1282 mateusz.vi 460 
 
1318 mateusz.vi 461 
    /* write empty spaces until end of line */
1427 mateusz.vi 462 
    if (x < screenlastcol) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenlastcol - x);
1318 mateusz.vi 463 
 
1288 mateusz.vi 464 
#ifdef DBG_REFRESH
1333 mateusz.vi 465 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 466 
#endif
1282 mateusz.vi 467 
 
1275 mateusz.vi 468 
    if (y == screenh - 2) break;
469 
  }
1310 mateusz.vi 470 
 
1319 mateusz.vi 471 
  /* fill all lines below if empty (and they need to be redrawn) */
472 
  if (l == NULL) {
1427 mateusz.vi 473 
    while ((y < screenlastrow) && (y < uidirty.to)) {
474 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenlastcol);
1319 mateusz.vi 475 
    }
1318 mateusz.vi 476 
  }
1328 mateusz.vi 477 
 
478 
  /* scroll bar */
1427 mateusz.vi 479 
  for (y = 0; y < screenlastrow; y++) {
480 
    mdr_cout_char(y, screenlastcol, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 481 
  }
482 
 
483 
  /* scroll cursor */
484 
  if (db->totlines >= screenh) {
485 
    unsigned short topline = db->curline - db->cursorposy;
486 
    unsigned short col;
487 
    unsigned short totlines = db->totlines - screenh + 1;
488 
    if (db->totlines - screenh > screenh) {
1427 mateusz.vi 489 
      col = topline / (totlines / screenlastrow);
1328 mateusz.vi 490 
    } else {
1427 mateusz.vi 491 
      col = topline * screenlastrow / totlines;
1328 mateusz.vi 492 
    }
1427 mateusz.vi 493 
    if (col >= screenlastrow) col = screenh - 2;
494 
    mdr_cout_char(col, screenlastcol, ' ', SCHEME_SCROLL);
1328 mateusz.vi 495 
  }
1392 mateusz.vi 496 
 
497 
  /* clear out the dirty flag */
498 
  uidirty.from = 0xff;
1275 mateusz.vi 499 
}
500 
 
501 
 
1327 mateusz.vi 502 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 503 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 504 
 
505 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 506 
    db->cursorposx = 0;
1275 mateusz.vi 507 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 508 
    uidirty.from = 0;
509 
    uidirty.to = 0xff;
1275 mateusz.vi 510 
  } else {
1316 mateusz.vi 511 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 512 
  }
513 
}
514 
 
515 
 
1327 mateusz.vi 516 
static void cursor_up(struct file *db) {
1422 mateusz.vi 517 
  if (db->cursor->prev == NULL) return;
518 
 
519 
  db->curline -= 1;
520 
  db->cursor = db->cursor->prev;
521 
  if (db->cursorposy == 0) {
522 
    uidirty.from = 0;
523 
    uidirty.to = 0xff;
524 
  } else {
525 
    db->cursorposy -= 1;
1275 mateusz.vi 526 
  }
527 
}
528 
 
529 
 
1327 mateusz.vi 530 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 531 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 532 
  if (db->xoffset > db->cursor->len) {
533 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 534 
    uidirty.from = 0;
535 
    uidirty.to = 0xff;
1282 mateusz.vi 536 
  }
537 
 
1427 mateusz.vi 538 
  if (db->xoffset + screenlastcol <= db->cursor->len) {
1282 mateusz.vi 539 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 540 
    uidirty.from = 0;
541 
    uidirty.to = 0xff;
1282 mateusz.vi 542 
  }
1316 mateusz.vi 543 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 544 
}
545 
 
546 
 
1327 mateusz.vi 547 
static void cursor_down(struct file *db) {
1422 mateusz.vi 548 
  if (db->cursor->next == NULL) return;
549 
 
550 
  db->curline += 1;
551 
  db->cursor = db->cursor->next;
552 
  if (db->cursorposy < screenh - 2) {
553 
    db->cursorposy += 1;
554 
  } else {
555 
    uidirty.from = 0;
556 
    uidirty.to = 0xff;
1276 mateusz.vi 557 
  }
558 
}
559 
 
560 
 
1327 mateusz.vi 561 
static void cursor_left(struct file *db) {
1316 mateusz.vi 562 
  if (db->cursorposx > 0) {
563 
    db->cursorposx -= 1;
1302 mateusz.vi 564 
  } else if (db->xoffset > 0) {
565 
    db->xoffset -= 1;
1327 mateusz.vi 566 
    uidirty.from = 0;
567 
    uidirty.to = 0xff;
1302 mateusz.vi 568 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 569 
    cursor_up(db);
570 
    cursor_eol(db);
1302 mateusz.vi 571 
  }
572 
}
573 
 
574 
 
1327 mateusz.vi 575 
static void cursor_home(struct file *db) {
1316 mateusz.vi 576 
  db->cursorposx = 0;
1282 mateusz.vi 577 
  if (db->xoffset != 0) {
578 
    db->xoffset = 0;
1327 mateusz.vi 579 
    uidirty.from = 0;
580 
    uidirty.to = 0xff;
1282 mateusz.vi 581 
  }
1276 mateusz.vi 582 
}
583 
 
584 
 
1327 mateusz.vi 585 
static void cursor_right(struct file *db) {
1316 mateusz.vi 586 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
587 
    if (db->cursorposx < screenw - 2) {
588 
      db->cursorposx += 1;
1308 mateusz.vi 589 
    } else {
590 
      db->xoffset += 1;
1327 mateusz.vi 591 
      uidirty.from = 0;
592 
      uidirty.to = 0xff;
1308 mateusz.vi 593 
    }
1357 mateusz.vi 594 
  } else if (db->cursor->next != NULL) { /* jump to start of next line */
1327 mateusz.vi 595 
    cursor_down(db);
596 
    cursor_home(db);
1308 mateusz.vi 597 
  }
598 
}
599 
 
600 
 
1327 mateusz.vi 601 
static void del(struct file *db) {
1316 mateusz.vi 602 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
603 
    _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 604 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 605 
    uidirty.from = db->cursorposy;
606 
    uidirty.to = db->cursorposy;
1393 mateusz.vi 607 
    db->modflag = 1;
1292 mateusz.vi 608 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
609 
    struct line far *nextline = db->cursor->next;
610 
    if (db->cursor->next->len > 0) {
1340 mateusz.vi 611 
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
1337 mateusz.vi 612 
        _fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 613 
        db->cursor->len += db->cursor->next->len;
614 
      }
615 
    }
1340 mateusz.vi 616 
 
1292 mateusz.vi 617 
    db->cursor->next = db->cursor->next->next;
618 
    db->cursor->next->prev = db->cursor;
1340 mateusz.vi 619 
 
1339 mateusz.vi 620 
    line_free(nextline);
1327 mateusz.vi 621 
    uidirty.from = db->cursorposy;
622 
    uidirty.to = 0xff;
1328 mateusz.vi 623 
    db->totlines -= 1;
1393 mateusz.vi 624 
    db->modflag = 1;
1292 mateusz.vi 625 
  }
626 
}
627 
 
628 
 
1327 mateusz.vi 629 
static void bkspc(struct file *db) {
1302 mateusz.vi 630 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1421 mateusz.vi 631 
  if ((db->cursorposx + db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 632 
 
1327 mateusz.vi 633 
  cursor_left(db);
634 
  del(db);
1302 mateusz.vi 635 
}
636 
 
637 
 
1450 mateusz.vi 638 
#define LOADFILE_FILENOTFOUND 2
639 
 
1346 mateusz.vi 640 
/* returns 0 on success, 1 on file not found, 2 on other error */
1449 mateusz.vi 641 
static unsigned char loadfile(struct file *db, const char *fname) {
1324 mateusz.vi 642 
  char *buffptr;
643 
  unsigned int len, llen;
1287 mateusz.vi 644 
  int fd;
1324 mateusz.vi 645 
  unsigned char eolfound;
1449 mateusz.vi 646 
  unsigned char err = 0;
1287 mateusz.vi 647 
 
1355 mateusz.vi 648 
  /* free the entire linked list of lines */
649 
  db_rewind(db);
650 
  while (db->cursor) {
651 
    struct line far *victim;
652 
    victim = db->cursor;
653 
    db->cursor = db->cursor->next;
654 
    line_free(victim);
655 
  }
1321 mateusz.vi 656 
 
1551 mateusz.vi 657 
  /* zero out the struct (take care to preserve the id of the slot, though) */
658 
  {
659 
    unsigned char slotid = db->slotid;
660 
    bzero(db, sizeof(struct file));
661 
    db->slotid = slotid;
662 
  }
1355 mateusz.vi 663 
 
1448 mateusz.vi 664 
  /* start by adding an empty line */
665 
  if (line_add(db, NULL, 0) != 0) return(2);
666 
 
1418 mateusz.vi 667 
  if (fname == NULL) goto SKIPLOADING;
1321 mateusz.vi 668 
 
1543 mateusz.vi 669 
  /* make the filename canonical (DOS 3+ only, on earlier versions it just copies the filename) */
670 
  mdr_dos_truename(db->fname, fname);
1355 mateusz.vi 671 
 
1450 mateusz.vi 672 
  err = _dos_open(fname, O_RDONLY, &fd);
673 
  if (err != 0) goto SKIPLOADING;
1287 mateusz.vi 674 
 
1313 mateusz.vi 675 
  db->lfonly = 1;
676 
 
1324 mateusz.vi 677 
  for (eolfound = 0;;) {
678 
    unsigned short consumedbytes;
679 
 
680 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
681 
    buffptr = buff;
682 
 
683 
    FINDLINE:
684 
 
1361 mateusz.vi 685 
    /* look for nearest \n (also expand tabs) */
1324 mateusz.vi 686 
    for (consumedbytes = 0;; consumedbytes++) {
1361 mateusz.vi 687 
 
688 
      if (buffptr[consumedbytes] == '\t') {
689 
        llen = consumedbytes;
690 
        break;
691 
      }
692 
 
1324 mateusz.vi 693 
      if (consumedbytes == len) {
694 
        llen = consumedbytes;
695 
        break;
1323 mateusz.vi 696 
      }
1324 mateusz.vi 697 
      if (buffptr[consumedbytes] == '\r') {
698 
        llen = consumedbytes;
699 
        consumedbytes++;
700 
        db->lfonly = 0;
1320 mateusz.vi 701 
        break;
702 
      }
1324 mateusz.vi 703 
      if (buffptr[consumedbytes] == '\n') {
704 
        eolfound = 1;
705 
        llen = consumedbytes;
706 
        consumedbytes++;
707 
        break;
708 
      }
1287 mateusz.vi 709 
    }
1324 mateusz.vi 710 
 
711 
    /* consumedbytes is the amount of bytes processed from buffptr,
712 
     * llen is the length of line's payload (without its line terminator) */
713 
 
714 
    /* append content, if line is non-empty */
715 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1339 mateusz.vi 716 
      goto IOERR;
1287 mateusz.vi 717 
    }
718 
 
1419 mateusz.vi 719 
    /* allocate the next line if current line ended */
1324 mateusz.vi 720 
    if (eolfound) {
1328 mateusz.vi 721 
      if (line_add(db, NULL, 0) != 0) {
1339 mateusz.vi 722 
        goto IOERR;
1324 mateusz.vi 723 
      }
724 
      eolfound = 0;
725 
    }
1287 mateusz.vi 726 
 
1361 mateusz.vi 727 
    /* append 8 spaces if tab char found */
1412 mateusz.vi 728 
    if ((consumedbytes < len) && (buffptr[consumedbytes] == '\t') && (glob_tablessmode == 0)) {
1361 mateusz.vi 729 
      consumedbytes++;
730 
      if (line_append(db, "        ", 8) != 0) {
731 
        goto IOERR;
732 
      }
733 
    }
734 
 
1324 mateusz.vi 735 
    /* anything left? process the buffer leftover again */
736 
    if (consumedbytes < len) {
737 
      len -= consumedbytes;
738 
      buffptr += consumedbytes;
739 
      goto FINDLINE;
740 
    }
741 
 
742 
  }
743 
 
1287 mateusz.vi 744 
  _dos_close(fd);
745 
 
1321 mateusz.vi 746 
  SKIPLOADING:
747 
 
1448 mateusz.vi 748 
  /* rewind cursor to top of file because it has been used by line_add() */
1339 mateusz.vi 749 
  db_rewind(db);
1320 mateusz.vi 750 
 
1448 mateusz.vi 751 
  return(err);
1339 mateusz.vi 752 
 
753 
  IOERR:
754 
  _dos_close(fd);
1450 mateusz.vi 755 
  return(1);
1287 mateusz.vi 756 
}
757 
 
758 
 
1356 mateusz.vi 759 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
760 
 * of argc and argv, saves some 330 bytes of binary size
761 
 * returns non-zero on error */
762 
static int parseargv(struct file *dbarr) {
763 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
764 
  unsigned short count = 0;
765 
  char *arg;
766 
  unsigned short lastarg = 0;
1449 mateusz.vi 767 
  unsigned char err;
1356 mateusz.vi 768 
 
769 
  while (!lastarg) {
770 
    /* jump to nearest arg */
771 
    while (*tail == ' ') {
772 
      *tail = 0;
773 
      tail++;
774 
    }
775 
 
776 
    if (*tail == '\r') {
777 
      *tail = 0;
778 
      break;
779 
    }
780 
 
781 
    arg = tail;
782 
 
783 
    /* jump to next delimiter */
784 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
785 
 
786 
    /* if \r then remember this is the last arg */
787 
    if (*tail == '\r') lastarg = 1;
788 
 
789 
    *tail = 0;
790 
    tail++;
791 
 
792 
    /* look at the arg now */
793 
    if (*arg == '/') {
1412 mateusz.vi 794 
      if (arg[1] == 't') { /* /t = do not expand tabs */
795 
        glob_tablessmode = 1;
796 
 
797 
      } else if (arg[1] == 'm') { /* /m = force mono mode */
798 
        glob_monomode = 1;
799 
 
800 
      } else {  /* help screen */
1419 mateusz.vi 801 
        mdr_coutraw_str(svarlang_str(1,3)); /* Sved, the SvarDOS editor */
1412 mateusz.vi 802 
        mdr_coutraw_str(" [");
1419 mateusz.vi 803 
        mdr_coutraw_str(svarlang_str(1,4)); /* ver */
1412 mateusz.vi 804 
        mdr_coutraw_puts(" " PVER "]");
805 
        mdr_coutraw_puts("Copyright (C) " PDATE " Mateusz Viste");
806 
        mdr_coutraw_crlf();
1433 mateusz.vi 807 
        mdr_coutraw_str("sved [/m] [/t] ");
1412 mateusz.vi 808 
        mdr_coutraw_puts(svarlang_str(1,1)); /* args syntax */
809 
        mdr_coutraw_crlf();
810 
        mdr_coutraw_puts(svarlang_str(1,10)); /* /m */
811 
        mdr_coutraw_puts(svarlang_str(1,11)); /* /t */
812 
        return(-1);
1387 mateusz.vi 813 
      }
1412 mateusz.vi 814 
      continue;
1356 mateusz.vi 815 
    }
816 
 
817 
    /* looks to be a filename */
818 
    if (count == 10) {
1420 mateusz.vi 819 
      mdr_coutraw_puts(svarlang_str(0,12)); /* too many files */
820 
      return(-1);
1356 mateusz.vi 821 
    }
822 
 
823 
    /* try loading it */
1387 mateusz.vi 824 
    mdr_coutraw_str(svarlang_str(1,2));
825 
    mdr_coutraw_char(' ');
1356 mateusz.vi 826 
    mdr_coutraw_puts(arg);
827 
    err = loadfile(&(dbarr[count]), arg);
828 
    if (err) {
1450 mateusz.vi 829 
      if (err == LOADFILE_FILENOTFOUND) { /* file not found */
1396 mateusz.vi 830 
        if ((count == 0) && (lastarg != 0)) { /* a 'file not found' is fine if only one file was given */
831 
          err = 0;
832 
        } else {
833 
          err = 11;
834 
        }
1356 mateusz.vi 835 
      } else { /* general error */
836 
        err = 10;
837 
      }
1396 mateusz.vi 838 
      if (err) {
839 
        mdr_coutraw_puts(svarlang_str(0,err));
840 
        return(-1);
841 
      }
1356 mateusz.vi 842 
    }
843 
    count++;
844 
  }
845 
 
846 
  return(0);
847 
}
848 
 
849 
 
1327 mateusz.vi 850 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1340 mateusz.vi 851 
  if (curline_resize(db, db->cursor->len + len) == 0) {
1317 mateusz.vi 852 
    unsigned short off = db->xoffset + db->cursorposx;
1393 mateusz.vi 853 
    db->modflag = 1;
1317 mateusz.vi 854 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
855 
    db->cursor->len += len;
1327 mateusz.vi 856 
    uidirty.from = db->cursorposy;
857 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 858 
    while (len--) {
859 
      db->cursor->payload[off++] = *databuf;
860 
      databuf++;
1327 mateusz.vi 861 
      cursor_right(db);
1317 mateusz.vi 862 
    }
863 
  }
864 
}
865 
 
866 
 
1343 mateusz.vi 867 
/* recompute db->curline by counting nodes in linked list */
868 
static void recompute_curline(struct file *db) {
869 
  const struct line far *l = db->cursor;
870 
 
871 
  db->curline = 0;
872 
  while (l->prev != NULL) {
873 
    db->curline += 1;
874 
    l = l->prev;
875 
  }
876 
}
877 
 
878 
 
1354 mateusz.vi 879 
enum MENU_ACTION {
1393 mateusz.vi 880 
  MENU_NONE   = 0,
881 
  MENU_OPEN   = 1,
882 
  MENU_SAVE   = 2,
883 
  MENU_SAVEAS = 3,
884 
  MENU_CLOSE  = 4,
885 
  MENU_CHGEOL = 5,
1418 mateusz.vi 886 
  MENU_QUIT   = 6
1354 mateusz.vi 887 
};
888 
 
889 
static enum MENU_ACTION ui_menu(void) {
890 
  unsigned short i, curchoice, attr, x, slen;
1393 mateusz.vi 891 
  unsigned short xorigin, yorigin;
1354 mateusz.vi 892 
 
893 
  /* find out the longest string */
894 
  slen = 0;
1355 mateusz.vi 895 
  for (i = MENU_OPEN; i <= MENU_QUIT; i++) {
1354 mateusz.vi 896 
    x = strlen(svarlang_str(8, i));
897 
    if (x > slen) slen = x;
898 
  }
899 
 
1393 mateusz.vi 900 
  /* calculate where to draw the menu on screen */
901 
  xorigin = (screenw - (slen + 5)) / 2;
1395 mateusz.vi 902 
  yorigin = (screenh - (MENU_QUIT - MENU_OPEN + 6)) / 2;
1393 mateusz.vi 903 
 
1395 mateusz.vi 904 
  /* */
905 
  uidirty.from = yorigin;
906 
  uidirty.to = 0xff;
907 
  uidirty.statusbar = 1;
908 
 
909 
  /* hide the cursor */
910 
  mdr_cout_cursor_hide();
911 
 
1355 mateusz.vi 912 
  curchoice = MENU_OPEN;
1354 mateusz.vi 913 
  for (;;) {
914 
    /* render menu */
1393 mateusz.vi 915 
    for (i = MENU_NONE; i <= MENU_QUIT + 1; i++) {
916 
      mdr_cout_char_rep(yorigin + i, xorigin, ' ', SCHEME_MENU, slen+4);
1354 mateusz.vi 917 
      if (i == curchoice) {
918 
        attr = SCHEME_MENU_CUR;
1415 mateusz.vi 919 
        mdr_cout_char_rep(yorigin + i, xorigin + 1, ' ', SCHEME_MENU_SEL, slen + 2);
1354 mateusz.vi 920 
      } else {
921 
        attr = SCHEME_MENU;
922 
      }
1416 mateusz.vi 923 
      mdr_cout_str(yorigin + i, xorigin + 2, svarlang_str(8, i), attr, slen);
1354 mateusz.vi 924 
    }
925 
    /* wait for key */
1410 mateusz.vi 926 
    switch (mdr_dos_getkey2()) {
1354 mateusz.vi 927 
      case 0x150: /* down */
928 
        if (curchoice == MENU_QUIT) {
1355 mateusz.vi 929 
          curchoice = MENU_OPEN;
1354 mateusz.vi 930 
        } else {
931 
          curchoice++;
932 
        }
933 
        break;
934 
      case 0x148: /* up */
1355 mateusz.vi 935 
        if (curchoice == MENU_OPEN) {
1354 mateusz.vi 936 
          curchoice = MENU_QUIT;
937 
        } else {
938 
          curchoice--;
939 
        }
940 
        break;
1395 mateusz.vi 941 
      default:
942 
        curchoice = MENU_NONE;
943 
        /* FALLTHRU */
944 
      case '\r': /* ENTER */
945 
        mdr_cout_cursor_show();
946 
        return(curchoice);
1354 mateusz.vi 947 
    }
948 
  }
949 
}
950 
 
951 
 
1549 mateusz.vi 952 
static struct file *select_slot(struct file *dbarr, unsigned short curfile) {
1355 mateusz.vi 953 
  uidirty.from = 0;
954 
  uidirty.to = 0xff;
955 
  uidirty.statusbar = 1;
956 
 
957 
  dbarr = &(dbarr[curfile]);
1549 mateusz.vi 958 
 
1415 mateusz.vi 959 
  /* force redraw now, because the main() routine might not if this is exit
960 
   * time and we want to show the user which file has unsaved changes */
1549 mateusz.vi 961 
  ui_statusbar(dbarr);
1355 mateusz.vi 962 
  ui_refresh(dbarr);
963 
  return(dbarr);
964 
}
965 
 
966 
 
1347 mateusz.vi 967 
/* main returns nothing, ie. sved always exits with a zero exit code
968 
 * (this saves 20 bytes of executable footprint) */
969 
void main(void) {
1355 mateusz.vi 970 
  static struct file dbarr[10];
971 
  struct file *db = dbarr; /* visible file is the first slot by default */
1548 mateusz.vi 972 
  static struct line far *clipboard;
1538 mateusz.vi 973 
  static unsigned char original_breakflag;
1275 mateusz.vi 974 
 
1418 mateusz.vi 975 
  { /* load NLS resource */
1364 mateusz.vi 976 
    unsigned short i = 0;
977 
    const char far *selfptr;
1548 mateusz.vi 978 
    char lang[8];
1364 mateusz.vi 979 
    selfptr = mdr_dos_selfexe();
980 
    if (selfptr != NULL) {
981 
      do {
1548 mateusz.vi 982 
        buff[i] = selfptr[i];
983 
      } while (buff[i++] != 0);
984 
      svarlang_autoload_exepath(buff, mdr_dos_getenv(lang, "LANG", sizeof(lang)));
1364 mateusz.vi 985 
    }
1307 mateusz.vi 986 
  }
1282 mateusz.vi 987 
 
1355 mateusz.vi 988 
  /* preload all slots with empty files */
1549 mateusz.vi 989 
  {
990 
    unsigned short i;
991 
    for (i = 0; i < 10; i++) {
992 
      loadfile(&(dbarr[i]), NULL);
993 
      dbarr[i].slotid = i;
994 
    }
1355 mateusz.vi 995 
  }
996 
 
1356 mateusz.vi 997 
  /* parse argv (and load files, if any passed on) */
998 
  if (parseargv(dbarr) != 0) return;
1282 mateusz.vi 999 
 
1412 mateusz.vi 1000 
  if ((mdr_cout_init(&screenw, &screenh) != 0) && (glob_monomode == 0)) {
1333 mateusz.vi 1001 
    /* load color scheme if mdr_cout_init returns a color flag */
1002 
    SCHEME_TEXT = 0x17;
1354 mateusz.vi 1003 
    SCHEME_MENU = 0x70;
1388 mateusz.vi 1004 
    SCHEME_MENU_CUR = 0x6f;
1005 
    SCHEME_MENU_SEL = 0x66;
1333 mateusz.vi 1006 
    SCHEME_STBAR1 = 0x70;
1007 
    SCHEME_STBAR2 = 0x78;
1392 mateusz.vi 1008 
    SCHEME_STBAR3 = 0x3f;
1333 mateusz.vi 1009 
    SCHEME_SCROLL = 0x70;
1388 mateusz.vi 1010 
    SCHEME_MSG = 0x6f;
1333 mateusz.vi 1011 
    SCHEME_ERR = 0x4f;
1012 
  }
1427 mateusz.vi 1013 
  screenlastrow = screenh - 1;
1014 
  screenlastcol = screenw - 1;
1275 mateusz.vi 1015 
 
1414 mateusz.vi 1016 
  /* instruct DOS to stop detecting CTRL+C because user needs it for
1017 
   * copy/paste operations. also remember the original status of the BREAK
1018 
   * flag so I can restore it as it was before quitting. */
1019 
  original_breakflag = mdr_dos_ctrlc_disable();
1410 mateusz.vi 1020 
 
1275 mateusz.vi 1021 
  for (;;) {
1022 
    int k;
1023 
 
1362 mateusz.vi 1024 
    /* add an extra empty line if cursor is on last line and this line is not empty */
1025 
    if ((db->cursor->next == NULL) && (db->cursor->len != 0)) {
1026 
      if (line_add(db, NULL, 0) == 0) {
1027 
        db->cursor = db->cursor->prev; /* line_add() changes the cursor pointer */
1437 mateusz.vi 1028 
        db->curline -= 1;
1362 mateusz.vi 1029 
      }
1030 
    }
1031 
 
1327 mateusz.vi 1032 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 1033 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 1034 
 
1392 mateusz.vi 1035 
    ui_refresh(db);
1036 
 
1436 mateusz.vi 1037 
    if ((uidirty.statusbar != 0) || (db->modflagprev != db->modflag) || (db->curline_prev != db->curline)) {
1549 mateusz.vi 1038 
      ui_statusbar(db);
1342 mateusz.vi 1039 
      uidirty.statusbar = 0;
1355 mateusz.vi 1040 
      db->modflagprev = db->modflag;
1436 mateusz.vi 1041 
      db->curline_prev = db->curline;
1342 mateusz.vi 1042 
    }
1328 mateusz.vi 1043 
#ifdef DBG_LINENUM
1044 
      {
1045 
        char ddd[10];
1046 
        db->curline += 1;
1047 
        ddd[0] = '0' + db->curline / 100;
1048 
        ddd[1] = '0' + (db->curline % 100) / 10;
1049 
        ddd[2] = '0' + (db->curline % 10);
1050 
        db->curline -= 1;
1051 
        ddd[3] = '/';
1052 
        ddd[4] = '0' + db->totlines / 100;
1053 
        ddd[5] = '0' + (db->totlines % 100) / 10;
1054 
        ddd[6] = '0' + (db->totlines % 10);
1055 
        ddd[7] = 0;
1333 mateusz.vi 1056 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 1057 
      }
1058 
#endif
1275 mateusz.vi 1059 
 
1410 mateusz.vi 1060 
    k = mdr_dos_getkey2();
1282 mateusz.vi 1061 
 
1275 mateusz.vi 1062 
    if (k == 0x150) { /* down */
1327 mateusz.vi 1063 
      cursor_down(db);
1275 mateusz.vi 1064 
 
1065 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 1066 
      cursor_up(db);
1275 mateusz.vi 1067 
 
1068 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 1069 
      cursor_right(db);
1275 mateusz.vi 1070 
 
1071 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 1072 
      cursor_left(db);
1275 mateusz.vi 1073 
 
1282 mateusz.vi 1074 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 1075 
      unsigned char dist = db->cursorposy + screenh - 1;
1076 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
1077 
        db->cursor = db->cursor->prev;
1078 
        dist--;
1079 
      }
1080 
      if (dist != 0) {
1081 
        db->cursorposy = 0;
1082 
        db->cursorposx = 0;
1083 
      } else {
1084 
        dist = db->cursorposy;
1085 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
1086 
      }
1087 
      uidirty.from = 0;
1088 
      uidirty.to = 0xff;
1343 mateusz.vi 1089 
      recompute_curline(db);
1282 mateusz.vi 1090 
 
1091 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 1092 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
1093 
      while ((dist != 0) && (db->cursor->next != NULL)) {
1094 
        db->cursor = db->cursor->next;
1095 
        dist--;
1096 
      }
1097 
      if (dist != 0) {
1098 
        db->cursorposy = screenh - 2;
1099 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
1100 
        db->cursorposx = 0;
1101 
      } else {
1102 
        dist = screenh - 2 - db->cursorposy;
1103 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
1104 
      }
1105 
      uidirty.from = 0;
1106 
      uidirty.to = 0xff;
1343 mateusz.vi 1107 
      recompute_curline(db);
1282 mateusz.vi 1108 
 
1109 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 1110 
       cursor_home(db);
1282 mateusz.vi 1111 
 
1112 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 1113 
       cursor_eol(db);
1282 mateusz.vi 1114 
 
1275 mateusz.vi 1115 
    } else if (k == 0x1B) { /* ESC */
1354 mateusz.vi 1116 
      int quitnow = 0;
1394 mateusz.vi 1117 
      char fname[64];
1354 mateusz.vi 1118 
      int saveflag = 0;
1393 mateusz.vi 1119 
      enum MENU_ACTION ui_action;
1275 mateusz.vi 1120 
 
1392 mateusz.vi 1121 
      /* collect the exact menu action and clear the screen */
1122 
      ui_action = ui_menu();
1123 
      ui_refresh(db);
1354 mateusz.vi 1124 
 
1392 mateusz.vi 1125 
      switch (ui_action) {
1126 
 
1354 mateusz.vi 1127 
        case MENU_NONE:
1128 
          break;
1129 
 
1130 
        case MENU_OPEN:
1131 
          /* display a warning if unsaved changes are pending */
1547 mateusz.vi 1132 
          if (db->modflag != 0) ui_msg(4, 8, 0, SCHEME_MSG);
1354 mateusz.vi 1133 
 
1134 
          /* ask for filename */
1135 
          ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
1136 
          if (fname[0] != 0) {
1449 mateusz.vi 1137 
            unsigned char err;
1354 mateusz.vi 1138 
            err = loadfile(db, fname);
1139 
            if (err != 0) {
1450 mateusz.vi 1140 
              if (err == LOADFILE_FILENOTFOUND) {
1547 mateusz.vi 1141 
                ui_msg(11, 0, 0, SCHEME_ERR); /* file not found */
1354 mateusz.vi 1142 
              } else {
1547 mateusz.vi 1143 
                ui_msg(10, 0, 0, SCHEME_ERR);  /* ERROR */
1354 mateusz.vi 1144 
              }
1145 
              mdr_bios_tickswait(44); /* 3s */
1418 mateusz.vi 1146 
              loadfile(db, NULL);
1354 mateusz.vi 1147 
            }
1148 
          }
1393 mateusz.vi 1149 
          uidirty.from = 0;
1150 
          uidirty.to = 0xff;
1151 
          uidirty.statusbar = 1;
1354 mateusz.vi 1152 
          break;
1153 
 
1154 
        case MENU_SAVEAS:
1155 
          saveflag = 1;
1156 
          /* FALLTHRU */
1157 
        case MENU_SAVE:
1158 
          if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
1159 
            ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
1160 
            if (*fname == 0) break;
1161 
            saveflag = savefile(db, fname);
1162 
          } else {
1163 
            saveflag = savefile(db, NULL);
1164 
          }
1165 
 
1395 mateusz.vi 1166 
          mdr_cout_cursor_hide();
1167 
 
1354 mateusz.vi 1168 
          if (saveflag == 0) {
1547 mateusz.vi 1169 
            ui_msg(2, 0, 0, SCHEME_MSG);
1354 mateusz.vi 1170 
            mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
1171 
          } else {
1547 mateusz.vi 1172 
            ui_msg(10, 0, 0, SCHEME_ERR);
1354 mateusz.vi 1173 
            mdr_bios_tickswait(36); /* 2s */
1174 
          }
1395 mateusz.vi 1175 
          mdr_cout_cursor_show();
1354 mateusz.vi 1176 
          break;
1177 
 
1355 mateusz.vi 1178 
        case MENU_CLOSE:
1179 
          if (ui_confirm_if_unsaved(db) == 0) {
1418 mateusz.vi 1180 
            loadfile(db, NULL);
1355 mateusz.vi 1181 
          }
1182 
          uidirty.from = 0;
1183 
          uidirty.to = 0xff;
1184 
          uidirty.statusbar = 1;
1185 
          break;
1186 
 
1354 mateusz.vi 1187 
        case MENU_CHGEOL:
1393 mateusz.vi 1188 
          db->modflag = 1;
1354 mateusz.vi 1189 
          db->lfonly ^= 1;
1190 
          break;
1191 
 
1192 
        case MENU_QUIT:
1355 mateusz.vi 1193 
          quitnow = 1;
1549 mateusz.vi 1194 
          {
1195 
            unsigned short curfile;
1196 
            for (curfile = 0; curfile < 10; curfile++) {
1197 
              if (dbarr[curfile].modflag == 0) continue; /* skip unmodified slots */
1355 mateusz.vi 1198 
              db = select_slot(dbarr, curfile);
1441 mateusz.vi 1199 
              if (ui_confirm_if_unsaved(db) != 0) {
1200 
                quitnow = 0;
1201 
                break;
1202 
              }
1355 mateusz.vi 1203 
            }
1204 
          }
1354 mateusz.vi 1205 
          break;
1206 
      }
1207 
 
1208 
      if (quitnow) break;
1209 
 
1289 mateusz.vi 1210 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 1211 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 1212 
      /* add a new line */
1328 mateusz.vi 1213 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1393 mateusz.vi 1214 
        db->modflag = 1;
1328 mateusz.vi 1215 
        db->cursor = db->cursor->prev; /* back to original line */
1427 mateusz.vi 1216 
        db->curline -= 1;
1289 mateusz.vi 1217 
        /* trim the line above */
1328 mateusz.vi 1218 
        db->cursor->len = off;
1289 mateusz.vi 1219 
        /* move cursor to the (new) line below */
1328 mateusz.vi 1220 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 1221 
        uidirty.to = 0xff;
1328 mateusz.vi 1222 
        cursor_down(db);
1223 
        cursor_home(db);
1289 mateusz.vi 1224 
      } else {
1225 
        /* ERROR: OUT OF MEMORY */
1226 
      }
1227 
 
1292 mateusz.vi 1228 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 1229 
      del(db);
1292 mateusz.vi 1230 
 
1302 mateusz.vi 1231 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 1232 
      bkspc(db);
1302 mateusz.vi 1233 
 
1308 mateusz.vi 1234 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 1235 
      char c = k;
1327 mateusz.vi 1236 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 1237 
 
1317 mateusz.vi 1238 
    } else if (k == 0x009) { /* TAB */
1412 mateusz.vi 1239 
      if (glob_tablessmode == 0) {
1240 
        insert_in_line(db, "        ", 8);
1241 
      } else {
1242 
        insert_in_line(db, "\t", 1);
1243 
      }
1317 mateusz.vi 1244 
 
1355 mateusz.vi 1245 
    } else if ((k >= 0x13b) && (k <= 0x144)) { /* F1..F10 */
1549 mateusz.vi 1246 
      db = select_slot(dbarr, k - 0x13b);
1309 mateusz.vi 1247 
 
1325 mateusz.vi 1248 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
1249 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
1250 
      for (;;) {
1251 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
1252 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 1253 
        cursor_right(db);
1325 mateusz.vi 1254 
      }
1255 
      /* now skip to next non-space or end of file */
1256 
      for (;;) {
1327 mateusz.vi 1257 
        cursor_right(db);
1325 mateusz.vi 1258 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1259 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
1260 
      }
1261 
 
1262 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 1263 
      cursor_left(db);
1325 mateusz.vi 1264 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
1265 
      for (;;) {
1266 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
1267 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 1268 
        cursor_left(db);
1325 mateusz.vi 1269 
      }
1270 
      /* now skip to next space or start of file */
1271 
      for (;;) {
1327 mateusz.vi 1272 
        cursor_left(db);
1325 mateusz.vi 1273 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 1274 
          cursor_right(db);
1325 mateusz.vi 1275 
          break;
1276 
        }
1277 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
1278 
      }
1279 
 
1410 mateusz.vi 1280 
    } else if ((k == 0x003) || (k == 0x018)) { /* CTRL+C or CTRL+X */
1281 
      /* free clipboard if anything in it */
1282 
      if (clipboard != NULL) line_free(clipboard);
1283 
 
1284 
      /* copy cursor line to clipboard */
1285 
      clipboard = line_calloc(db->cursor->len);
1286 
      if (clipboard == NULL) {
1547 mateusz.vi 1287 
        ui_msg(10, 0, 0, SCHEME_ERR); /* ERROR */
1410 mateusz.vi 1288 
        mdr_bios_tickswait(18); /* 1s */
1289 
      } else {
1427 mateusz.vi 1290 
        mdr_cout_char_rep(db->cursorposy, 0, ' ', ((SCHEME_TEXT >> 4) | (SCHEME_TEXT << 4)) & 0xff, screenlastcol);
1410 mateusz.vi 1291 
        uidirty.from = db->cursorposy;
1292 
        uidirty.to = db->cursorposy;
1293 
        if (db->cursor->len != 0) {
1294 
          _fmemmove(clipboard->payload, db->cursor->payload, db->cursor->len);
1295 
          clipboard->len = db->cursor->len;
1296 
        }
1297 
        mdr_bios_tickswait(2); /* ca 100ms */
1298 
 
1299 
        /* if this is about cutting the line (CTRL+X) then delete cur line */
1300 
        if ((k == 0x018) && ((db->cursor->next != NULL) || (db->cursor->prev != NULL))) {
1301 
          if (db->cursor->next) db->cursor->next->prev = db->cursor->prev;
1302 
          if (db->cursor->prev) db->cursor->prev->next = db->cursor->next;
1303 
          clipboard->prev = db->cursor;
1304 
          if (db->cursor->next) {
1305 
            db->cursor = db->cursor->next;
1306 
          } else {
1307 
            cursor_up(db);
1308 
          }
1309 
          line_free(clipboard->prev);
1423 mateusz.vi 1310 
          db->totlines -= 1;
1410 mateusz.vi 1311 
          uidirty.from = 0;
1312 
          uidirty.to = 0xff;
1412 mateusz.vi 1313 
          recompute_curline(db);
1410 mateusz.vi 1314 
        }
1315 
      }
1316 
 
1420 mateusz.vi 1317 
    } else if ((k == 0x016) && (clipboard != NULL)) { /* CTRL+V */
1318 
      if (line_add(db, clipboard->payload, clipboard->len) != 0) {
1547 mateusz.vi 1319 
        ui_msg(10, 0, 0, SCHEME_ERR); /* ERROR */
1420 mateusz.vi 1320 
        mdr_bios_tickswait(18); /* 1s */
1321 
      } else {
1322 
        /* rewire the linked list so the new line is on top of the previous one */
1323 
        clipboard->prev = db->cursor->prev;
1324 
        /* remove prev node from list */
1325 
        db->cursor->prev = db->cursor->prev->prev;
1326 
        if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor;
1327 
        /* insert the node after cursor now */
1328 
        clipboard->prev->next = db->cursor->next;
1329 
        if (db->cursor->next != NULL) db->cursor->next->prev = clipboard->prev;
1330 
        clipboard->prev->prev = db->cursor;
1331 
        db->cursor->next = clipboard->prev;
1332 
        cursor_down(db);
1410 mateusz.vi 1333 
      }
1334 
      uidirty.from = 0;
1335 
      uidirty.to = 0xff;
1412 mateusz.vi 1336 
      recompute_curline(db);
1410 mateusz.vi 1337 
 
1333 mateusz.vi 1338 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 1339 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
1340 
      char buff[4];
1341 
      const char *HEX = "0123456789ABCDEF";
1342 
      buff[0] = HEX[(k >> 8) & 15];
1343 
      buff[1] = HEX[(k >> 4) & 15];
1344 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 1345 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
1346 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1410 mateusz.vi 1347 
      mdr_dos_getkey2();
1275 mateusz.vi 1348 
      break;
1333 mateusz.vi 1349 
#endif
1275 mateusz.vi 1350 
    }
1351 
  }
1352 
 
1353 
  mdr_cout_close();
1354 
 
1414 mateusz.vi 1355 
  /* restore the DOS BREAK flag if it was originally set */
1356 
  if (original_breakflag != 0) mdr_dos_ctrlc_enable();
1357 
 
1320 mateusz.vi 1358 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 1359 
 
1347 mateusz.vi 1360 
  return;
1275 mateusz.vi 1361 
}