Subversion Repositories SvarDOS

Rev

Rev 1572 | Rev 1574 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
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 
 
1556 mateusz.vi 26 
#include <i86.h> /* MK_FP() */
1275 mateusz.vi 27 
 
1556 mateusz.vi 28 
#include "libc.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 
 
1537 mateusz.vi 37 
#define PVER "2023.5"
1356 mateusz.vi 38 
#define PDATE "2023"
39 
 
1326 mateusz.vi 40 
/*****************************************************************************
41 
 * global variables and definitions                                          *
42 
 *****************************************************************************/
43 
 
1275 mateusz.vi 44 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
1333 mateusz.vi 45 
static unsigned char SCHEME_TEXT   = 0x07,
1354 mateusz.vi 46 
                     SCHEME_MENU   = 0x70,
47 
                     SCHEME_MENU_CUR= 0x0f,
48 
                     SCHEME_MENU_SEL= 0x00,
1333 mateusz.vi 49 
                     SCHEME_STBAR1 = 0x70,
1358 mateusz.vi 50 
                     SCHEME_STBAR2 = 0x70, /* greyed out information */
51 
                     SCHEME_STBAR3 = 0x70, /* query */
1333 mateusz.vi 52 
                     SCHEME_SCROLL = 0x70,
53 
                     SCHEME_MSG    = 0x70,
1358 mateusz.vi 54 
                     SCHEME_ERR    = 0x70;
1327 mateusz.vi 55 
 
1427 mateusz.vi 56 
static unsigned char screenw, screenh, screenlastrow, screenlastcol;
1412 mateusz.vi 57 
static unsigned char glob_monomode, glob_tablessmode;
1275 mateusz.vi 58 
 
1548 mateusz.vi 59 
static char buff[512]; /* short lived buffer for whatever needed */
60 
 
1327 mateusz.vi 61 
static struct {
62 
    unsigned char from;
63 
    unsigned char to;
1342 mateusz.vi 64 
    unsigned char statusbar;
65 
} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */
1327 mateusz.vi 66 
 
1275 mateusz.vi 67 
#define SCROLL_CURSOR 0xB1
68 
 
69 
struct line {
1430 mateusz.vi 70 
  unsigned short len;
71 
  struct line far *next;
1288 mateusz.vi 72 
  struct line far *prev;
1275 mateusz.vi 73 
  char payload[1];
74 
};
75 
 
1315 mateusz.vi 76 
struct file {
1288 mateusz.vi 77 
  struct line far *cursor;
1275 mateusz.vi 78 
  unsigned short xoffset;
1348 mateusz.vi 79 
  unsigned short cursorposx;
80 
  unsigned short cursorposy;
1328 mateusz.vi 81 
  unsigned short totlines;
82 
  unsigned short curline;
1436 mateusz.vi 83 
  unsigned short curline_prev;
1330 mateusz.vi 84 
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
85 
  char modflag;  /* non-zero if file has been modified since last save */
1355 mateusz.vi 86 
  char modflagprev;
1549 mateusz.vi 87 
  char slotid; /* 0..9 */
1332 mateusz.vi 88 
  char fname[128];
1275 mateusz.vi 89 
};
90 
 
91 
 
1572 mateusz.vi 92 
 
1326 mateusz.vi 93 
/*****************************************************************************
1572 mateusz.vi 94 
 * assembly "functions"                                                      *
95 
 *****************************************************************************/
96 
 
97 
unsigned short dosalloc(unsigned short siz);
98 
 
99 
#pragma aux dosalloc = \
100 
"mov ah, 0x48" \
101 
"int 0x21" \
102 
"jnc done" \
103 
"xor ax, ax" \
104 
"done:" \
105 
parm [bx] \
106 
value [ax];
107 
 
108 
 
109 
unsigned short dosfree(unsigned short segn);
110 
 
111 
#pragma aux dosfree = \
112 
"mov ah, 0x49" \
113 
"int 0x21" \
114 
"jc done" \
115 
"xor ax, ax" \
116 
"done:" \
117 
parm [es] \
118 
value [ax];
119 
 
1573 mateusz.vi 120 
unsigned short dosfclose(unsigned short handle);
1572 mateusz.vi 121 
 
1573 mateusz.vi 122 
#pragma aux dosfclose = \
123 
"mov ah,0x3e" \
124 
"int 0x21" \
125 
"jc done" \
126 
"xor ax, ax" \
127 
"done:" \
128 
parm [bx] \
129 
value [ax];
130 
 
131 
 
1572 mateusz.vi 132 
/*****************************************************************************
1326 mateusz.vi 133 
 * functions                                                                 *
134 
 *****************************************************************************/
135 
 
1339 mateusz.vi 136 
static struct line far *line_calloc(unsigned short siz) {
1342 mateusz.vi 137 
  struct line far *res;
1556 mateusz.vi 138 
  unsigned short seg;
1461 mateusz.vi 139 
 
1572 mateusz.vi 140 
  seg = dosalloc((sizeof(struct line) + siz + 15) / 16);
1556 mateusz.vi 141 
  if (seg == 0) return(NULL);
1342 mateusz.vi 142 
  res = MK_FP(seg, 0);
1461 mateusz.vi 143 
  res->len = 0;
144 
  res->next = NULL;
145 
  res->prev = NULL;
146 
 
147 
  return(res);
1339 mateusz.vi 148 
}
149 
 
150 
 
151 
static void line_free(struct line far *ptr) {
1572 mateusz.vi 152 
  dosfree(FP_SEG(ptr));
1339 mateusz.vi 153 
}
154 
 
155 
 
1550 mateusz.vi 156 
static int curline_resize(struct file *db, unsigned short newsiz) {
1339 mateusz.vi 157 
  struct line far *newptr;
158 
 
1341 mateusz.vi 159 
  /* try resizing the block (much faster) */
1557 mateusz.vi 160 
  if (mdr_dos_resizeblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor)) == 0) return(0);
1339 mateusz.vi 161 
 
162 
  /* create a new block and copy data over */
163 
  newptr = line_calloc(newsiz);
1340 mateusz.vi 164 
  if (newptr == NULL) return(-1);
1568 mateusz.vi 165 
  fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
1340 mateusz.vi 166 
 
167 
  /* rewire the linked list */
168 
  db->cursor = newptr;
169 
  if (newptr->next) newptr->next->prev = newptr;
170 
  if (newptr->prev) newptr->prev->next = newptr;
171 
 
172 
  return(0);
1339 mateusz.vi 173 
}
174 
 
175 
 
1328 mateusz.vi 176 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 177 
 * returns non-zero on error */
1328 mateusz.vi 178 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 179 
  struct line far *l;
1275 mateusz.vi 180 
 
1339 mateusz.vi 181 
  l = line_calloc(slen);
1287 mateusz.vi 182 
  if (l == NULL) return(-1);
183 
 
1275 mateusz.vi 184 
  l->prev = db->cursor;
185 
  if (db->cursor) {
186 
    l->next = db->cursor->next;
187 
    db->cursor->next = l;
188 
    l->next->prev = l;
189 
  }
190 
  db->cursor = l;
1342 mateusz.vi 191 
  if (slen > 0) {
1568 mateusz.vi 192 
    fmemmove(l->payload, line, slen);
1342 mateusz.vi 193 
    l->len = slen;
194 
  }
1287 mateusz.vi 195 
 
1328 mateusz.vi 196 
  db->totlines += 1;
197 
  db->curline += 1;
198 
 
1287 mateusz.vi 199 
  return(0);
1275 mateusz.vi 200 
}
201 
 
202 
 
1348 mateusz.vi 203 
static void ui_getstring(const char *query, char *s, unsigned short maxlen) {
204 
  unsigned short len = 0;
1544 mateusz.vi 205 
  unsigned char x;
1332 mateusz.vi 206 
  int k;
207 
 
208 
  if (maxlen == 0) return;
209 
  maxlen--; /* make room for the nul terminator */
210 
 
211 
  /* print query string */
1544 mateusz.vi 212 
  x = mdr_cout_str(screenlastrow, 0, query, SCHEME_STBAR3, 40);
213 
  mdr_cout_char_rep(screenlastrow, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 214 
 
215 
  for (;;) {
1544 mateusz.vi 216 
    mdr_cout_locate(screenlastrow, x + len);
1410 mateusz.vi 217 
    k = mdr_dos_getkey2();
1332 mateusz.vi 218 
 
1345 mateusz.vi 219 
    switch (k) {
220 
      case 0x1b: /* ESC */
221 
        s[0] = 0;
222 
        return;
223 
      case '\r':
224 
        s[len] = 0;
225 
        return;
226 
      case 0x08: /* BKSPC */
227 
        if (len > 0) {
228 
          len--;
1544 mateusz.vi 229 
          mdr_cout_char(screenlastrow, x + len, ' ', SCHEME_STBAR3);
1345 mateusz.vi 230 
        }
231 
        break;
232 
      default:
233 
        if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
1544 mateusz.vi 234 
          mdr_cout_char(screenlastrow, x + len, k, SCHEME_STBAR3);
1345 mateusz.vi 235 
          s[len++] = k;
236 
        }
1332 mateusz.vi 237 
    }
1345 mateusz.vi 238 
  }
1332 mateusz.vi 239 
 
240 
}
241 
 
242 
 
1324 mateusz.vi 243 
/* append a nul-terminated string to line at cursor position */
1550 mateusz.vi 244 
static int line_append(struct file *f, const char *buf, unsigned short len) {
1427 mateusz.vi 245 
  if (sizeof(struct line) + f->cursor->len + len < len) goto ERR; /* overflow check */
246 
  if (curline_resize(f, f->cursor->len + len) != 0) goto ERR;
247 
 
1568 mateusz.vi 248 
  fmemmove(f->cursor->payload + f->cursor->len, buf, len);
1324 mateusz.vi 249 
  f->cursor->len += len;
250 
 
251 
  return(0);
1427 mateusz.vi 252 
  ERR:
253 
  return(-1);
1324 mateusz.vi 254 
}
255 
 
256 
 
1315 mateusz.vi 257 
static void db_rewind(struct file *db) {
1275 mateusz.vi 258 
  if (db->cursor == NULL) return;
259 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 260 
  db->curline = 0;
1275 mateusz.vi 261 
}
262 
 
263 
 
1541 mateusz.vi 264 
/* saves db file, resets db->modflag on success and overwrites the filename
265 
 * field if saveas is not NULL */
266 
static int savefile(struct file *db, const char *saveas) {
1539 mateusz.vi 267 
  int fd = 0;
268 
  const struct line far *l;
1556 mateusz.vi 269 
  unsigned short bytes;
1539 mateusz.vi 270 
  unsigned char eollen = 2;
271 
  const unsigned char *eolbuf = "\r\n";
272 
  int errflag = 0;
273 
 
274 
  /* if filename not overloaded then use the fname in db */
275 
  if (saveas == NULL) saveas = db->fname;
276 
 
277 
  _asm {
278 
    push ax
279 
    push cx
280 
    push dx
281 
 
282 
    mov ah, 0x3C    /* create or truncate file */
283 
    xor cx, cx      /* file attributes */
284 
    mov dx, saveas  /* works only in SMALL/TINY mode */
285 
    int 0x21
286 
    jnc DONE
287 
    mov errflag, ax
288 
    DONE:
289 
    mov fd, ax
290 
 
291 
    pop dx
292 
    pop cx
293 
    pop ax
294 
  }
295 
 
296 
  if (errflag != 0) return(-1);
297 
 
298 
  l = db->cursor;
299 
  while (l->prev) l = l->prev;
300 
 
301 
  /* preset line terminators */
302 
  if (db->lfonly) {
303 
    eolbuf++;
304 
    eollen--;
305 
  }
306 
 
307 
  while (l) {
308 
    /* do not write the last empty line, it is only useful for edition */
309 
    if (l->len != 0) {
1556 mateusz.vi 310 
      errflag |= mdr_dos_write(fd, l->payload, l->len, &bytes);
1539 mateusz.vi 311 
    } else if (l->next == NULL) {
312 
      break;
313 
    }
1556 mateusz.vi 314 
    errflag |= mdr_dos_write(fd, eolbuf, eollen, &bytes);
1539 mateusz.vi 315 
    l = l->next;
316 
  }
317 
 
1573 mateusz.vi 318 
  errflag |= dosfclose(fd);
1539 mateusz.vi 319 
 
1541 mateusz.vi 320 
  /* did it all work? */
321 
  if (errflag == 0) {
322 
    db->modflag = 0;
323 
    if (saveas != db->fname) mdr_dos_truename(db->fname, saveas);
324 
  }
325 
 
1539 mateusz.vi 326 
  return(errflag);
327 
}
328 
 
329 
 
1549 mateusz.vi 330 
static void ui_statusbar(const struct file *db) {
1356 mateusz.vi 331 
  const char *s = svarlang_strid(0); /* ESC=MENU */
1348 mateusz.vi 332 
  unsigned short helpcol = screenw - strlen(s);
1440 mateusz.vi 333 
  unsigned short col;
1275 mateusz.vi 334 
 
1425 mateusz.vi 335 
  /* slot number (guaranteed to be 0-9) */
1355 mateusz.vi 336 
  {
337 
    char slot[4] = "#00";
1549 mateusz.vi 338 
    if (db->slotid == 9) {
1425 mateusz.vi 339 
      slot[1] = '1';
340 
    } else {
1549 mateusz.vi 341 
      slot[2] += db->slotid + 1;
1425 mateusz.vi 342 
    }
1427 mateusz.vi 343 
    mdr_cout_str(screenlastrow, 0, slot, SCHEME_STBAR2, 3);
1355 mateusz.vi 344 
  }
1313 mateusz.vi 345 
 
1355 mateusz.vi 346 
  /* fill rest of status bar with background */
1427 mateusz.vi 347 
  mdr_cout_char_rep(screenlastrow, 3, ' ', SCHEME_STBAR1, helpcol - 3);
1355 mateusz.vi 348 
 
1313 mateusz.vi 349 
  /* eol type */
1330 mateusz.vi 350 
  {
351 
    const char *eoltype = "CRLF";
1353 mateusz.vi 352 
    if (db->lfonly) eoltype += 2;
1440 mateusz.vi 353 
    mdr_cout_str(screenlastrow, helpcol - 5, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 354 
  }
1313 mateusz.vi 355 
 
1438 mateusz.vi 356 
  /* line numbers */
1436 mateusz.vi 357 
  {
1438 mateusz.vi 358 
    unsigned short x;
359 
    unsigned char count = 0;
1440 mateusz.vi 360 
    col = helpcol - 7;
1438 mateusz.vi 361 
 
1439 mateusz.vi 362 
    x = db->totlines;
1438 mateusz.vi 363 
    AGAIN:
1436 mateusz.vi 364 
    do {
1439 mateusz.vi 365 
      mdr_cout_char(screenlastrow, col--, '0' + (x % 10), SCHEME_STBAR1);
1436 mateusz.vi 366 
      x /= 10;
367 
    } while (x);
1438 mateusz.vi 368 
    /* redo same exercise, but printing the current line now */
369 
    if (count == 0) {
370 
      count = 1;
1439 mateusz.vi 371 
      mdr_cout_char(screenlastrow, col--, '/', SCHEME_STBAR1);
1438 mateusz.vi 372 
      x = 1 + db->curline;
373 
      goto AGAIN;
374 
    }
1440 mateusz.vi 375 
  }
1438 mateusz.vi 376 
 
1440 mateusz.vi 377 
  /* filename and modflag */
378 
  {
379 
    const char *fn;
380 
    unsigned short x;
381 
    unsigned short maxfnlen = col - 6;
382 
    if (db->fname[0] == 0) {
383 
      fn = svarlang_str(0, 1); /* "UNTITLED" */
384 
    } else {
385 
      /* display filename up to maxfnlen chars */
386 
      fn = db->fname;
387 
      x = strlen(fn);
388 
      if (x > maxfnlen) fn += x - maxfnlen;
389 
    }
390 
    x = mdr_cout_str(screenlastrow, 4, fn, SCHEME_STBAR1, maxfnlen);
391 
    if (db->modflag) mdr_cout_char(screenlastrow, 5 + x, '!', SCHEME_STBAR2);
1436 mateusz.vi 392 
  }
393 
 
1427 mateusz.vi 394 
  mdr_cout_str(screenlastrow, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 395 
}
396 
 
397 
 
1547 mateusz.vi 398 
static void ui_msg(unsigned short msgid1, unsigned short msgid2, unsigned short msgid3, unsigned char attr) {
399 
  unsigned short x, y, maxmsglen, i;
400 
  unsigned short msgcount = 1;
401 
  const char *msg[3];
1331 mateusz.vi 402 
 
1547 mateusz.vi 403 
  msg[0] = svarlang_strid(msgid1);
404 
 
405 
  if (msgid2 != 0) {
406 
    msgcount = 2;
407 
    msg[1] = svarlang_strid(msgid2);
1331 mateusz.vi 408 
  }
1547 mateusz.vi 409 
  if (msgid3 != 0) {
410 
    msgcount = 3;
411 
    msg[2] = svarlang_strid(msgid3);
412 
  }
1331 mateusz.vi 413 
 
1547 mateusz.vi 414 
  /* find longest msg */
415 
  maxmsglen = 0;
416 
  for (i = 0; i < msgcount; i++) {
417 
    y = strlen(msg[i]);
418 
    if (y > maxmsglen) maxmsglen = y;
419 
  }
420 
 
1331 mateusz.vi 421 
  y = (screenh - 6) >> 1;
1547 mateusz.vi 422 
  x = (screenw - maxmsglen - 3) >> 1;
423 
  for (i = y+1+msgcount; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, maxmsglen + 2);
1331 mateusz.vi 424 
  x++;
1345 mateusz.vi 425 
 
1547 mateusz.vi 426 
  for (i = 0; i < msgcount; i++) {
427 
    mdr_cout_str(y+1+i, x, msg[i], attr, maxmsglen);
428 
  }
1312 mateusz.vi 429 
 
1327 mateusz.vi 430 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 431 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 432 
}
433 
 
434 
 
1539 mateusz.vi 435 
/* returns 0 if operation may proceed, non-zero to cancel */
1541 mateusz.vi 436 
static unsigned char ui_confirm_if_unsaved(struct file *db) {
1539 mateusz.vi 437 
  int k;
438 
 
1342 mateusz.vi 439 
  if (db->modflag == 0) return(0);
440 
 
1355 mateusz.vi 441 
  mdr_cout_cursor_hide();
442 
 
1539 mateusz.vi 443 
  /* if file has been modified then ask for confirmation:
444 
   * ENTER        : agree to data loss
445 
   * SPACE        : SAVE file before quit (only if valid filename present)
446 
   * anything else: ABORT */
1547 mateusz.vi 447 
  ui_msg(4, 5, (db->fname[0])?9:8, SCHEME_MSG);
1342 mateusz.vi 448 
 
1539 mateusz.vi 449 
  k = mdr_dos_getkey2();
1355 mateusz.vi 450 
  mdr_cout_cursor_show();
451 
 
1539 mateusz.vi 452 
  /* ENTER = agree to loose unsaved data */
453 
  if (k == '\r') return(0);
454 
 
455 
  /* SPACE = save file and continue */
456 
  if ((k == ' ') && (db->fname[0] != 0) && (savefile(db, NULL) == 0)) return(0);
457 
 
458 
  /* any other key = cancel operation */
459 
  return(1);
1342 mateusz.vi 460 
}
461 
 
462 
 
1327 mateusz.vi 463 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 464 
  unsigned char x;
1310 mateusz.vi 465 
  const struct line far *l;
1316 mateusz.vi 466 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 467 
 
1392 mateusz.vi 468 
  /* quit early if nothing to refresh */
469 
  if (uidirty.from == 0xff) return;
470 
 
1288 mateusz.vi 471 
#ifdef DBG_REFRESH
1282 mateusz.vi 472 
  static char m = 'a';
473 
  m++;
474 
  if (m > 'z') m = 'a';
1288 mateusz.vi 475 
#endif
1282 mateusz.vi 476 
 
1310 mateusz.vi 477 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 478 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 479 
 
1310 mateusz.vi 480 
  /* iterate over lines and redraw whatever needs to be redrawn */
481 
  for (; l != NULL; l = l->next, y++) {
482 
 
483 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 484 
    if (y < uidirty.from) continue;
485 
    if (y > uidirty.to) break;
1282 mateusz.vi 486 
 
1318 mateusz.vi 487 
    x = 0;
1275 mateusz.vi 488 
    if (db->xoffset < l->len) {
1318 mateusz.vi 489 
      unsigned char i, limit;
490 
      if (l->len - db->xoffset < screenw) {
491 
        limit = l->len;
492 
      } else {
1427 mateusz.vi 493 
        limit = db->xoffset + screenlastcol;
1318 mateusz.vi 494 
      }
1333 mateusz.vi 495 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 496 
    }
1282 mateusz.vi 497 
 
1318 mateusz.vi 498 
    /* write empty spaces until end of line */
1427 mateusz.vi 499 
    if (x < screenlastcol) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenlastcol - x);
1318 mateusz.vi 500 
 
1288 mateusz.vi 501 
#ifdef DBG_REFRESH
1333 mateusz.vi 502 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 503 
#endif
1282 mateusz.vi 504 
 
1275 mateusz.vi 505 
    if (y == screenh - 2) break;
506 
  }
1310 mateusz.vi 507 
 
1319 mateusz.vi 508 
  /* fill all lines below if empty (and they need to be redrawn) */
509 
  if (l == NULL) {
1427 mateusz.vi 510 
    while ((y < screenlastrow) && (y < uidirty.to)) {
511 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenlastcol);
1319 mateusz.vi 512 
    }
1318 mateusz.vi 513 
  }
1328 mateusz.vi 514 
 
515 
  /* scroll bar */
1427 mateusz.vi 516 
  for (y = 0; y < screenlastrow; y++) {
517 
    mdr_cout_char(y, screenlastcol, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 518 
  }
519 
 
520 
  /* scroll cursor */
521 
  if (db->totlines >= screenh) {
522 
    unsigned short topline = db->curline - db->cursorposy;
523 
    unsigned short col;
524 
    unsigned short totlines = db->totlines - screenh + 1;
525 
    if (db->totlines - screenh > screenh) {
1427 mateusz.vi 526 
      col = topline / (totlines / screenlastrow);
1328 mateusz.vi 527 
    } else {
1427 mateusz.vi 528 
      col = topline * screenlastrow / totlines;
1328 mateusz.vi 529 
    }
1427 mateusz.vi 530 
    if (col >= screenlastrow) col = screenh - 2;
531 
    mdr_cout_char(col, screenlastcol, ' ', SCHEME_SCROLL);
1328 mateusz.vi 532 
  }
1392 mateusz.vi 533 
 
534 
  /* clear out the dirty flag */
535 
  uidirty.from = 0xff;
1275 mateusz.vi 536 
}
537 
 
538 
 
1327 mateusz.vi 539 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 540 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 541 
 
542 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 543 
    db->cursorposx = 0;
1275 mateusz.vi 544 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 545 
    uidirty.from = 0;
546 
    uidirty.to = 0xff;
1275 mateusz.vi 547 
  } else {
1316 mateusz.vi 548 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 549 
  }
550 
}
551 
 
552 
 
1327 mateusz.vi 553 
static void cursor_up(struct file *db) {
1422 mateusz.vi 554 
  if (db->cursor->prev == NULL) return;
555 
 
556 
  db->curline -= 1;
557 
  db->cursor = db->cursor->prev;
558 
  if (db->cursorposy == 0) {
559 
    uidirty.from = 0;
560 
    uidirty.to = 0xff;
561 
  } else {
562 
    db->cursorposy -= 1;
1275 mateusz.vi 563 
  }
564 
}
565 
 
566 
 
1327 mateusz.vi 567 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 568 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 569 
  if (db->xoffset > db->cursor->len) {
570 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 571 
    uidirty.from = 0;
572 
    uidirty.to = 0xff;
1282 mateusz.vi 573 
  }
574 
 
1427 mateusz.vi 575 
  if (db->xoffset + screenlastcol <= db->cursor->len) {
1282 mateusz.vi 576 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 577 
    uidirty.from = 0;
578 
    uidirty.to = 0xff;
1282 mateusz.vi 579 
  }
1316 mateusz.vi 580 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 581 
}
582 
 
583 
 
1327 mateusz.vi 584 
static void cursor_down(struct file *db) {
1422 mateusz.vi 585 
  if (db->cursor->next == NULL) return;
586 
 
587 
  db->curline += 1;
588 
  db->cursor = db->cursor->next;
589 
  if (db->cursorposy < screenh - 2) {
590 
    db->cursorposy += 1;
591 
  } else {
592 
    uidirty.from = 0;
593 
    uidirty.to = 0xff;
1276 mateusz.vi 594 
  }
595 
}
596 
 
597 
 
1327 mateusz.vi 598 
static void cursor_left(struct file *db) {
1316 mateusz.vi 599 
  if (db->cursorposx > 0) {
600 
    db->cursorposx -= 1;
1302 mateusz.vi 601 
  } else if (db->xoffset > 0) {
602 
    db->xoffset -= 1;
1327 mateusz.vi 603 
    uidirty.from = 0;
604 
    uidirty.to = 0xff;
1302 mateusz.vi 605 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 606 
    cursor_up(db);
607 
    cursor_eol(db);
1302 mateusz.vi 608 
  }
609 
}
610 
 
611 
 
1327 mateusz.vi 612 
static void cursor_home(struct file *db) {
1316 mateusz.vi 613 
  db->cursorposx = 0;
1282 mateusz.vi 614 
  if (db->xoffset != 0) {
615 
    db->xoffset = 0;
1327 mateusz.vi 616 
    uidirty.from = 0;
617 
    uidirty.to = 0xff;
1282 mateusz.vi 618 
  }
1276 mateusz.vi 619 
}
620 
 
621 
 
1327 mateusz.vi 622 
static void cursor_right(struct file *db) {
1316 mateusz.vi 623 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
624 
    if (db->cursorposx < screenw - 2) {
625 
      db->cursorposx += 1;
1308 mateusz.vi 626 
    } else {
627 
      db->xoffset += 1;
1327 mateusz.vi 628 
      uidirty.from = 0;
629 
      uidirty.to = 0xff;
1308 mateusz.vi 630 
    }
1357 mateusz.vi 631 
  } else if (db->cursor->next != NULL) { /* jump to start of next line */
1327 mateusz.vi 632 
    cursor_down(db);
633 
    cursor_home(db);
1308 mateusz.vi 634 
  }
635 
}
636 
 
637 
 
1327 mateusz.vi 638 
static void del(struct file *db) {
1316 mateusz.vi 639 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
1568 mateusz.vi 640 
    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 641 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 642 
    uidirty.from = db->cursorposy;
643 
    uidirty.to = db->cursorposy;
1393 mateusz.vi 644 
    db->modflag = 1;
1292 mateusz.vi 645 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
646 
    struct line far *nextline = db->cursor->next;
647 
    if (db->cursor->next->len > 0) {
1340 mateusz.vi 648 
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
1568 mateusz.vi 649 
        fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 650 
        db->cursor->len += db->cursor->next->len;
651 
      }
652 
    }
1340 mateusz.vi 653 
 
1292 mateusz.vi 654 
    db->cursor->next = db->cursor->next->next;
655 
    db->cursor->next->prev = db->cursor;
1340 mateusz.vi 656 
 
1339 mateusz.vi 657 
    line_free(nextline);
1327 mateusz.vi 658 
    uidirty.from = db->cursorposy;
659 
    uidirty.to = 0xff;
1328 mateusz.vi 660 
    db->totlines -= 1;
1393 mateusz.vi 661 
    db->modflag = 1;
1292 mateusz.vi 662 
  }
663 
}
664 
 
665 
 
1327 mateusz.vi 666 
static void bkspc(struct file *db) {
1302 mateusz.vi 667 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1421 mateusz.vi 668 
  if ((db->cursorposx + db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 669 
 
1327 mateusz.vi 670 
  cursor_left(db);
671 
  del(db);
1302 mateusz.vi 672 
}
673 
 
674 
 
1450 mateusz.vi 675 
#define LOADFILE_FILENOTFOUND 2
676 
 
1346 mateusz.vi 677 
/* returns 0 on success, 1 on file not found, 2 on other error */
1449 mateusz.vi 678 
static unsigned char loadfile(struct file *db, const char *fname) {
1324 mateusz.vi 679 
  char *buffptr;
1556 mateusz.vi 680 
  unsigned short len, llen;
681 
  unsigned short fd;
1324 mateusz.vi 682 
  unsigned char eolfound;
1449 mateusz.vi 683 
  unsigned char err = 0;
1287 mateusz.vi 684 
 
1355 mateusz.vi 685 
  /* free the entire linked list of lines */
686 
  db_rewind(db);
687 
  while (db->cursor) {
688 
    struct line far *victim;
689 
    victim = db->cursor;
690 
    db->cursor = db->cursor->next;
691 
    line_free(victim);
692 
  }
1321 mateusz.vi 693 
 
1551 mateusz.vi 694 
  /* zero out the struct (take care to preserve the id of the slot, though) */
695 
  {
696 
    unsigned char slotid = db->slotid;
697 
    bzero(db, sizeof(struct file));
698 
    db->slotid = slotid;
699 
  }
1355 mateusz.vi 700 
 
1448 mateusz.vi 701 
  /* start by adding an empty line */
702 
  if (line_add(db, NULL, 0) != 0) return(2);
703 
 
1418 mateusz.vi 704 
  if (fname == NULL) goto SKIPLOADING;
1321 mateusz.vi 705 
 
1543 mateusz.vi 706 
  /* make the filename canonical (DOS 3+ only, on earlier versions it just copies the filename) */
707 
  mdr_dos_truename(db->fname, fname);
1355 mateusz.vi 708 
 
1565 mateusz.vi 709 
  /* fopen file */
710 
  fd = 0;
711 
  _asm {
712 
    push cx
713 
    push dx
714 
 
715 
    mov ax, 0x3d00
716 
    mov dx, fname   // works only in SMALL memory model!
717 
    xor cl, cl
718 
    int 0x21
719 
    mov fd, ax
720 
    jnc done
721 
    mov err, al
722 
    done:
723 
 
724 
    pop dx
725 
    pop cx
726 
  }
727 
 
1450 mateusz.vi 728 
  if (err != 0) goto SKIPLOADING;
1287 mateusz.vi 729 
 
1313 mateusz.vi 730 
  db->lfonly = 1;
731 
 
1324 mateusz.vi 732 
  for (eolfound = 0;;) {
733 
    unsigned short consumedbytes;
734 
 
1556 mateusz.vi 735 
    if ((mdr_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
1324 mateusz.vi 736 
    buffptr = buff;
737 
 
738 
    FINDLINE:
739 
 
1361 mateusz.vi 740 
    /* look for nearest \n (also expand tabs) */
1324 mateusz.vi 741 
    for (consumedbytes = 0;; consumedbytes++) {
1361 mateusz.vi 742 
 
743 
      if (buffptr[consumedbytes] == '\t') {
744 
        llen = consumedbytes;
745 
        break;
746 
      }
747 
 
1324 mateusz.vi 748 
      if (consumedbytes == len) {
749 
        llen = consumedbytes;
750 
        break;
1323 mateusz.vi 751 
      }
1324 mateusz.vi 752 
      if (buffptr[consumedbytes] == '\r') {
753 
        llen = consumedbytes;
754 
        consumedbytes++;
755 
        db->lfonly = 0;
1320 mateusz.vi 756 
        break;
757 
      }
1324 mateusz.vi 758 
      if (buffptr[consumedbytes] == '\n') {
759 
        eolfound = 1;
760 
        llen = consumedbytes;
761 
        consumedbytes++;
762 
        break;
763 
      }
1287 mateusz.vi 764 
    }
1324 mateusz.vi 765 
 
766 
    /* consumedbytes is the amount of bytes processed from buffptr,
767 
     * llen is the length of line's payload (without its line terminator) */
768 
 
769 
    /* append content, if line is non-empty */
770 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1339 mateusz.vi 771 
      goto IOERR;
1287 mateusz.vi 772 
    }
773 
 
1419 mateusz.vi 774 
    /* allocate the next line if current line ended */
1324 mateusz.vi 775 
    if (eolfound) {
1328 mateusz.vi 776 
      if (line_add(db, NULL, 0) != 0) {
1339 mateusz.vi 777 
        goto IOERR;
1324 mateusz.vi 778 
      }
779 
      eolfound = 0;
780 
    }
1287 mateusz.vi 781 
 
1361 mateusz.vi 782 
    /* append 8 spaces if tab char found */
1412 mateusz.vi 783 
    if ((consumedbytes < len) && (buffptr[consumedbytes] == '\t') && (glob_tablessmode == 0)) {
1361 mateusz.vi 784 
      consumedbytes++;
785 
      if (line_append(db, "        ", 8) != 0) {
786 
        goto IOERR;
787 
      }
788 
    }
789 
 
1324 mateusz.vi 790 
    /* anything left? process the buffer leftover again */
791 
    if (consumedbytes < len) {
792 
      len -= consumedbytes;
793 
      buffptr += consumedbytes;
794 
      goto FINDLINE;
795 
    }
796 
 
797 
  }
798 
 
1573 mateusz.vi 799 
  dosfclose(fd);
1287 mateusz.vi 800 
 
1321 mateusz.vi 801 
  SKIPLOADING:
802 
 
1448 mateusz.vi 803 
  /* rewind cursor to top of file because it has been used by line_add() */
1339 mateusz.vi 804 
  db_rewind(db);
1320 mateusz.vi 805 
 
1448 mateusz.vi 806 
  return(err);
1339 mateusz.vi 807 
 
808 
  IOERR:
1573 mateusz.vi 809 
  dosfclose(fd);
1450 mateusz.vi 810 
  return(1);
1287 mateusz.vi 811 
}
812 
 
813 
 
1356 mateusz.vi 814 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
815 
 * of argc and argv, saves some 330 bytes of binary size
816 
 * returns non-zero on error */
817 
static int parseargv(struct file *dbarr) {
818 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
819 
  unsigned short count = 0;
820 
  char *arg;
821 
  unsigned short lastarg = 0;
1449 mateusz.vi 822 
  unsigned char err;
1356 mateusz.vi 823 
 
824 
  while (!lastarg) {
825 
    /* jump to nearest arg */
826 
    while (*tail == ' ') {
827 
      *tail = 0;
828 
      tail++;
829 
    }
830 
 
831 
    if (*tail == '\r') {
832 
      *tail = 0;
833 
      break;
834 
    }
835 
 
836 
    arg = tail;
837 
 
838 
    /* jump to next delimiter */
839 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
840 
 
841 
    /* if \r then remember this is the last arg */
842 
    if (*tail == '\r') lastarg = 1;
843 
 
844 
    *tail = 0;
845 
    tail++;
846 
 
847 
    /* look at the arg now */
848 
    if (*arg == '/') {
1412 mateusz.vi 849 
      if (arg[1] == 't') { /* /t = do not expand tabs */
850 
        glob_tablessmode = 1;
851 
 
852 
      } else if (arg[1] == 'm') { /* /m = force mono mode */
853 
        glob_monomode = 1;
854 
 
855 
      } else {  /* help screen */
1419 mateusz.vi 856 
        mdr_coutraw_str(svarlang_str(1,3)); /* Sved, the SvarDOS editor */
1412 mateusz.vi 857 
        mdr_coutraw_str(" [");
1419 mateusz.vi 858 
        mdr_coutraw_str(svarlang_str(1,4)); /* ver */
1412 mateusz.vi 859 
        mdr_coutraw_puts(" " PVER "]");
860 
        mdr_coutraw_puts("Copyright (C) " PDATE " Mateusz Viste");
861 
        mdr_coutraw_crlf();
1433 mateusz.vi 862 
        mdr_coutraw_str("sved [/m] [/t] ");
1412 mateusz.vi 863 
        mdr_coutraw_puts(svarlang_str(1,1)); /* args syntax */
864 
        mdr_coutraw_crlf();
865 
        mdr_coutraw_puts(svarlang_str(1,10)); /* /m */
866 
        mdr_coutraw_puts(svarlang_str(1,11)); /* /t */
867 
        return(-1);
1387 mateusz.vi 868 
      }
1412 mateusz.vi 869 
      continue;
1356 mateusz.vi 870 
    }
871 
 
872 
    /* looks to be a filename */
873 
    if (count == 10) {
1420 mateusz.vi 874 
      mdr_coutraw_puts(svarlang_str(0,12)); /* too many files */
875 
      return(-1);
1356 mateusz.vi 876 
    }
877 
 
878 
    /* try loading it */
1387 mateusz.vi 879 
    mdr_coutraw_str(svarlang_str(1,2));
880 
    mdr_coutraw_char(' ');
1356 mateusz.vi 881 
    mdr_coutraw_puts(arg);
882 
    err = loadfile(&(dbarr[count]), arg);
883 
    if (err) {
1450 mateusz.vi 884 
      if (err == LOADFILE_FILENOTFOUND) { /* file not found */
1396 mateusz.vi 885 
        if ((count == 0) && (lastarg != 0)) { /* a 'file not found' is fine if only one file was given */
886 
          err = 0;
887 
        } else {
888 
          err = 11;
889 
        }
1356 mateusz.vi 890 
      } else { /* general error */
891 
        err = 10;
892 
      }
1396 mateusz.vi 893 
      if (err) {
894 
        mdr_coutraw_puts(svarlang_str(0,err));
895 
        return(-1);
896 
      }
1356 mateusz.vi 897 
    }
898 
    count++;
899 
  }
900 
 
901 
  return(0);
902 
}
903 
 
904 
 
1327 mateusz.vi 905 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1340 mateusz.vi 906 
  if (curline_resize(db, db->cursor->len + len) == 0) {
1317 mateusz.vi 907 
    unsigned short off = db->xoffset + db->cursorposx;
1393 mateusz.vi 908 
    db->modflag = 1;
1568 mateusz.vi 909 
    fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
1317 mateusz.vi 910 
    db->cursor->len += len;
1327 mateusz.vi 911 
    uidirty.from = db->cursorposy;
912 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 913 
    while (len--) {
914 
      db->cursor->payload[off++] = *databuf;
915 
      databuf++;
1327 mateusz.vi 916 
      cursor_right(db);
1317 mateusz.vi 917 
    }
918 
  }
919 
}
920 
 
921 
 
1343 mateusz.vi 922 
/* recompute db->curline by counting nodes in linked list */
923 
static void recompute_curline(struct file *db) {
924 
  const struct line far *l = db->cursor;
925 
 
926 
  db->curline = 0;
927 
  while (l->prev != NULL) {
928 
    db->curline += 1;
929 
    l = l->prev;
930 
  }
931 
}
932 
 
933 
 
1354 mateusz.vi 934 
enum MENU_ACTION {
1393 mateusz.vi 935 
  MENU_NONE   = 0,
936 
  MENU_OPEN   = 1,
937 
  MENU_SAVE   = 2,
938 
  MENU_SAVEAS = 3,
939 
  MENU_CLOSE  = 4,
940 
  MENU_CHGEOL = 5,
1418 mateusz.vi 941 
  MENU_QUIT   = 6
1354 mateusz.vi 942 
};
943 
 
944 
static enum MENU_ACTION ui_menu(void) {
945 
  unsigned short i, curchoice, attr, x, slen;
1393 mateusz.vi 946 
  unsigned short xorigin, yorigin;
1354 mateusz.vi 947 
 
948 
  /* find out the longest string */
949 
  slen = 0;
1355 mateusz.vi 950 
  for (i = MENU_OPEN; i <= MENU_QUIT; i++) {
1354 mateusz.vi 951 
    x = strlen(svarlang_str(8, i));
952 
    if (x > slen) slen = x;
953 
  }
954 
 
1393 mateusz.vi 955 
  /* calculate where to draw the menu on screen */
956 
  xorigin = (screenw - (slen + 5)) / 2;
1395 mateusz.vi 957 
  yorigin = (screenh - (MENU_QUIT - MENU_OPEN + 6)) / 2;
1393 mateusz.vi 958 
 
1395 mateusz.vi 959 
  /* */
960 
  uidirty.from = yorigin;
961 
  uidirty.to = 0xff;
962 
  uidirty.statusbar = 1;
963 
 
964 
  /* hide the cursor */
965 
  mdr_cout_cursor_hide();
966 
 
1355 mateusz.vi 967 
  curchoice = MENU_OPEN;
1354 mateusz.vi 968 
  for (;;) {
969 
    /* render menu */
1393 mateusz.vi 970 
    for (i = MENU_NONE; i <= MENU_QUIT + 1; i++) {
971 
      mdr_cout_char_rep(yorigin + i, xorigin, ' ', SCHEME_MENU, slen+4);
1354 mateusz.vi 972 
      if (i == curchoice) {
973 
        attr = SCHEME_MENU_CUR;
1415 mateusz.vi 974 
        mdr_cout_char_rep(yorigin + i, xorigin + 1, ' ', SCHEME_MENU_SEL, slen + 2);
1354 mateusz.vi 975 
      } else {
976 
        attr = SCHEME_MENU;
977 
      }
1416 mateusz.vi 978 
      mdr_cout_str(yorigin + i, xorigin + 2, svarlang_str(8, i), attr, slen);
1354 mateusz.vi 979 
    }
980 
    /* wait for key */
1410 mateusz.vi 981 
    switch (mdr_dos_getkey2()) {
1354 mateusz.vi 982 
      case 0x150: /* down */
983 
        if (curchoice == MENU_QUIT) {
1355 mateusz.vi 984 
          curchoice = MENU_OPEN;
1354 mateusz.vi 985 
        } else {
986 
          curchoice++;
987 
        }
988 
        break;
989 
      case 0x148: /* up */
1355 mateusz.vi 990 
        if (curchoice == MENU_OPEN) {
1354 mateusz.vi 991 
          curchoice = MENU_QUIT;
992 
        } else {
993 
          curchoice--;
994 
        }
995 
        break;
1395 mateusz.vi 996 
      default:
997 
        curchoice = MENU_NONE;
998 
        /* FALLTHRU */
999 
      case '\r': /* ENTER */
1000 
        mdr_cout_cursor_show();
1001 
        return(curchoice);
1354 mateusz.vi 1002 
    }
1003 
  }
1004 
}
1005 
 
1006 
 
1549 mateusz.vi 1007 
static struct file *select_slot(struct file *dbarr, unsigned short curfile) {
1355 mateusz.vi 1008 
  uidirty.from = 0;
1009 
  uidirty.to = 0xff;
1010 
  uidirty.statusbar = 1;
1011 
 
1012 
  dbarr = &(dbarr[curfile]);
1549 mateusz.vi 1013 
 
1415 mateusz.vi 1014 
  /* force redraw now, because the main() routine might not if this is exit
1015 
   * time and we want to show the user which file has unsaved changes */
1549 mateusz.vi 1016 
  ui_statusbar(dbarr);
1355 mateusz.vi 1017 
  ui_refresh(dbarr);
1018 
  return(dbarr);
1019 
}
1020 
 
1021 
 
1347 mateusz.vi 1022 
/* main returns nothing, ie. sved always exits with a zero exit code
1023 
 * (this saves 20 bytes of executable footprint) */
1024 
void main(void) {
1355 mateusz.vi 1025 
  static struct file dbarr[10];
1026 
  struct file *db = dbarr; /* visible file is the first slot by default */
1548 mateusz.vi 1027 
  static struct line far *clipboard;
1538 mateusz.vi 1028 
  static unsigned char original_breakflag;
1275 mateusz.vi 1029 
 
1418 mateusz.vi 1030 
  { /* load NLS resource */
1364 mateusz.vi 1031 
    unsigned short i = 0;
1032 
    const char far *selfptr;
1548 mateusz.vi 1033 
    char lang[8];
1364 mateusz.vi 1034 
    selfptr = mdr_dos_selfexe();
1035 
    if (selfptr != NULL) {
1036 
      do {
1548 mateusz.vi 1037 
        buff[i] = selfptr[i];
1038 
      } while (buff[i++] != 0);
1039 
      svarlang_autoload_exepath(buff, mdr_dos_getenv(lang, "LANG", sizeof(lang)));
1364 mateusz.vi 1040 
    }
1307 mateusz.vi 1041 
  }
1282 mateusz.vi 1042 
 
1355 mateusz.vi 1043 
  /* preload all slots with empty files */
1549 mateusz.vi 1044 
  {
1045 
    unsigned short i;
1046 
    for (i = 0; i < 10; i++) {
1047 
      loadfile(&(dbarr[i]), NULL);
1048 
      dbarr[i].slotid = i;
1049 
    }
1355 mateusz.vi 1050 
  }
1051 
 
1356 mateusz.vi 1052 
  /* parse argv (and load files, if any passed on) */
1053 
  if (parseargv(dbarr) != 0) return;
1282 mateusz.vi 1054 
 
1412 mateusz.vi 1055 
  if ((mdr_cout_init(&screenw, &screenh) != 0) && (glob_monomode == 0)) {
1333 mateusz.vi 1056 
    /* load color scheme if mdr_cout_init returns a color flag */
1057 
    SCHEME_TEXT = 0x17;
1354 mateusz.vi 1058 
    SCHEME_MENU = 0x70;
1388 mateusz.vi 1059 
    SCHEME_MENU_CUR = 0x6f;
1060 
    SCHEME_MENU_SEL = 0x66;
1333 mateusz.vi 1061 
    SCHEME_STBAR1 = 0x70;
1062 
    SCHEME_STBAR2 = 0x78;
1392 mateusz.vi 1063 
    SCHEME_STBAR3 = 0x3f;
1333 mateusz.vi 1064 
    SCHEME_SCROLL = 0x70;
1388 mateusz.vi 1065 
    SCHEME_MSG = 0x6f;
1333 mateusz.vi 1066 
    SCHEME_ERR = 0x4f;
1067 
  }
1427 mateusz.vi 1068 
  screenlastrow = screenh - 1;
1069 
  screenlastcol = screenw - 1;
1275 mateusz.vi 1070 
 
1414 mateusz.vi 1071 
  /* instruct DOS to stop detecting CTRL+C because user needs it for
1072 
   * copy/paste operations. also remember the original status of the BREAK
1073 
   * flag so I can restore it as it was before quitting. */
1074 
  original_breakflag = mdr_dos_ctrlc_disable();
1410 mateusz.vi 1075 
 
1275 mateusz.vi 1076 
  for (;;) {
1077 
    int k;
1078 
 
1362 mateusz.vi 1079 
    /* add an extra empty line if cursor is on last line and this line is not empty */
1080 
    if ((db->cursor->next == NULL) && (db->cursor->len != 0)) {
1081 
      if (line_add(db, NULL, 0) == 0) {
1082 
        db->cursor = db->cursor->prev; /* line_add() changes the cursor pointer */
1437 mateusz.vi 1083 
        db->curline -= 1;
1362 mateusz.vi 1084 
      }
1085 
    }
1086 
 
1327 mateusz.vi 1087 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 1088 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 1089 
 
1392 mateusz.vi 1090 
    ui_refresh(db);
1091 
 
1436 mateusz.vi 1092 
    if ((uidirty.statusbar != 0) || (db->modflagprev != db->modflag) || (db->curline_prev != db->curline)) {
1549 mateusz.vi 1093 
      ui_statusbar(db);
1342 mateusz.vi 1094 
      uidirty.statusbar = 0;
1355 mateusz.vi 1095 
      db->modflagprev = db->modflag;
1436 mateusz.vi 1096 
      db->curline_prev = db->curline;
1342 mateusz.vi 1097 
    }
1328 mateusz.vi 1098 
#ifdef DBG_LINENUM
1099 
      {
1100 
        char ddd[10];
1101 
        db->curline += 1;
1102 
        ddd[0] = '0' + db->curline / 100;
1103 
        ddd[1] = '0' + (db->curline % 100) / 10;
1104 
        ddd[2] = '0' + (db->curline % 10);
1105 
        db->curline -= 1;
1106 
        ddd[3] = '/';
1107 
        ddd[4] = '0' + db->totlines / 100;
1108 
        ddd[5] = '0' + (db->totlines % 100) / 10;
1109 
        ddd[6] = '0' + (db->totlines % 10);
1110 
        ddd[7] = 0;
1333 mateusz.vi 1111 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 1112 
      }
1113 
#endif
1275 mateusz.vi 1114 
 
1410 mateusz.vi 1115 
    k = mdr_dos_getkey2();
1282 mateusz.vi 1116 
 
1275 mateusz.vi 1117 
    if (k == 0x150) { /* down */
1327 mateusz.vi 1118 
      cursor_down(db);
1275 mateusz.vi 1119 
 
1120 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 1121 
      cursor_up(db);
1275 mateusz.vi 1122 
 
1123 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 1124 
      cursor_right(db);
1275 mateusz.vi 1125 
 
1126 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 1127 
      cursor_left(db);
1275 mateusz.vi 1128 
 
1282 mateusz.vi 1129 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 1130 
      unsigned char dist = db->cursorposy + screenh - 1;
1131 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
1132 
        db->cursor = db->cursor->prev;
1133 
        dist--;
1134 
      }
1135 
      if (dist != 0) {
1136 
        db->cursorposy = 0;
1137 
        db->cursorposx = 0;
1138 
      } else {
1139 
        dist = db->cursorposy;
1140 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
1141 
      }
1142 
      uidirty.from = 0;
1143 
      uidirty.to = 0xff;
1343 mateusz.vi 1144 
      recompute_curline(db);
1282 mateusz.vi 1145 
 
1146 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 1147 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
1148 
      while ((dist != 0) && (db->cursor->next != NULL)) {
1149 
        db->cursor = db->cursor->next;
1150 
        dist--;
1151 
      }
1152 
      if (dist != 0) {
1153 
        db->cursorposy = screenh - 2;
1154 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
1155 
        db->cursorposx = 0;
1156 
      } else {
1157 
        dist = screenh - 2 - db->cursorposy;
1158 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
1159 
      }
1160 
      uidirty.from = 0;
1161 
      uidirty.to = 0xff;
1343 mateusz.vi 1162 
      recompute_curline(db);
1282 mateusz.vi 1163 
 
1164 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 1165 
       cursor_home(db);
1282 mateusz.vi 1166 
 
1167 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 1168 
       cursor_eol(db);
1282 mateusz.vi 1169 
 
1275 mateusz.vi 1170 
    } else if (k == 0x1B) { /* ESC */
1354 mateusz.vi 1171 
      int quitnow = 0;
1394 mateusz.vi 1172 
      char fname[64];
1354 mateusz.vi 1173 
      int saveflag = 0;
1393 mateusz.vi 1174 
      enum MENU_ACTION ui_action;
1275 mateusz.vi 1175 
 
1392 mateusz.vi 1176 
      /* collect the exact menu action and clear the screen */
1177 
      ui_action = ui_menu();
1178 
      ui_refresh(db);
1354 mateusz.vi 1179 
 
1392 mateusz.vi 1180 
      switch (ui_action) {
1181 
 
1354 mateusz.vi 1182 
        case MENU_NONE:
1183 
          break;
1184 
 
1185 
        case MENU_OPEN:
1186 
          /* display a warning if unsaved changes are pending */
1547 mateusz.vi 1187 
          if (db->modflag != 0) ui_msg(4, 8, 0, SCHEME_MSG);
1354 mateusz.vi 1188 
 
1189 
          /* ask for filename */
1190 
          ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
1191 
          if (fname[0] != 0) {
1449 mateusz.vi 1192 
            unsigned char err;
1354 mateusz.vi 1193 
            err = loadfile(db, fname);
1194 
            if (err != 0) {
1450 mateusz.vi 1195 
              if (err == LOADFILE_FILENOTFOUND) {
1547 mateusz.vi 1196 
                ui_msg(11, 0, 0, SCHEME_ERR); /* file not found */
1354 mateusz.vi 1197 
              } else {
1547 mateusz.vi 1198 
                ui_msg(10, 0, 0, SCHEME_ERR);  /* ERROR */
1354 mateusz.vi 1199 
              }
1200 
              mdr_bios_tickswait(44); /* 3s */
1418 mateusz.vi 1201 
              loadfile(db, NULL);
1354 mateusz.vi 1202 
            }
1203 
          }
1393 mateusz.vi 1204 
          uidirty.from = 0;
1205 
          uidirty.to = 0xff;
1206 
          uidirty.statusbar = 1;
1354 mateusz.vi 1207 
          break;
1208 
 
1209 
        case MENU_SAVEAS:
1210 
          saveflag = 1;
1211 
          /* FALLTHRU */
1212 
        case MENU_SAVE:
1213 
          if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
1214 
            ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
1215 
            if (*fname == 0) break;
1216 
            saveflag = savefile(db, fname);
1217 
          } else {
1218 
            saveflag = savefile(db, NULL);
1219 
          }
1220 
 
1395 mateusz.vi 1221 
          mdr_cout_cursor_hide();
1222 
 
1354 mateusz.vi 1223 
          if (saveflag == 0) {
1547 mateusz.vi 1224 
            ui_msg(2, 0, 0, SCHEME_MSG);
1354 mateusz.vi 1225 
            mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
1226 
          } else {
1547 mateusz.vi 1227 
            ui_msg(10, 0, 0, SCHEME_ERR);
1354 mateusz.vi 1228 
            mdr_bios_tickswait(36); /* 2s */
1229 
          }
1395 mateusz.vi 1230 
          mdr_cout_cursor_show();
1354 mateusz.vi 1231 
          break;
1232 
 
1355 mateusz.vi 1233 
        case MENU_CLOSE:
1234 
          if (ui_confirm_if_unsaved(db) == 0) {
1418 mateusz.vi 1235 
            loadfile(db, NULL);
1355 mateusz.vi 1236 
          }
1237 
          uidirty.from = 0;
1238 
          uidirty.to = 0xff;
1239 
          uidirty.statusbar = 1;
1240 
          break;
1241 
 
1354 mateusz.vi 1242 
        case MENU_CHGEOL:
1393 mateusz.vi 1243 
          db->modflag = 1;
1354 mateusz.vi 1244 
          db->lfonly ^= 1;
1245 
          break;
1246 
 
1247 
        case MENU_QUIT:
1355 mateusz.vi 1248 
          quitnow = 1;
1549 mateusz.vi 1249 
          {
1250 
            unsigned short curfile;
1251 
            for (curfile = 0; curfile < 10; curfile++) {
1252 
              if (dbarr[curfile].modflag == 0) continue; /* skip unmodified slots */
1355 mateusz.vi 1253 
              db = select_slot(dbarr, curfile);
1441 mateusz.vi 1254 
              if (ui_confirm_if_unsaved(db) != 0) {
1255 
                quitnow = 0;
1256 
                break;
1257 
              }
1355 mateusz.vi 1258 
            }
1259 
          }
1354 mateusz.vi 1260 
          break;
1261 
      }
1262 
 
1263 
      if (quitnow) break;
1264 
 
1289 mateusz.vi 1265 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 1266 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 1267 
      /* add a new line */
1328 mateusz.vi 1268 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1393 mateusz.vi 1269 
        db->modflag = 1;
1328 mateusz.vi 1270 
        db->cursor = db->cursor->prev; /* back to original line */
1427 mateusz.vi 1271 
        db->curline -= 1;
1289 mateusz.vi 1272 
        /* trim the line above */
1328 mateusz.vi 1273 
        db->cursor->len = off;
1289 mateusz.vi 1274 
        /* move cursor to the (new) line below */
1328 mateusz.vi 1275 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 1276 
        uidirty.to = 0xff;
1328 mateusz.vi 1277 
        cursor_down(db);
1278 
        cursor_home(db);
1289 mateusz.vi 1279 
      } else {
1280 
        /* ERROR: OUT OF MEMORY */
1281 
      }
1282 
 
1292 mateusz.vi 1283 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 1284 
      del(db);
1292 mateusz.vi 1285 
 
1302 mateusz.vi 1286 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 1287 
      bkspc(db);
1302 mateusz.vi 1288 
 
1308 mateusz.vi 1289 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 1290 
      char c = k;
1327 mateusz.vi 1291 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 1292 
 
1317 mateusz.vi 1293 
    } else if (k == 0x009) { /* TAB */
1412 mateusz.vi 1294 
      if (glob_tablessmode == 0) {
1295 
        insert_in_line(db, "        ", 8);
1296 
      } else {
1297 
        insert_in_line(db, "\t", 1);
1298 
      }
1317 mateusz.vi 1299 
 
1355 mateusz.vi 1300 
    } else if ((k >= 0x13b) && (k <= 0x144)) { /* F1..F10 */
1549 mateusz.vi 1301 
      db = select_slot(dbarr, k - 0x13b);
1309 mateusz.vi 1302 
 
1325 mateusz.vi 1303 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
1304 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
1305 
      for (;;) {
1306 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
1307 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 1308 
        cursor_right(db);
1325 mateusz.vi 1309 
      }
1310 
      /* now skip to next non-space or end of file */
1311 
      for (;;) {
1327 mateusz.vi 1312 
        cursor_right(db);
1325 mateusz.vi 1313 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1314 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
1315 
      }
1316 
 
1317 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 1318 
      cursor_left(db);
1325 mateusz.vi 1319 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
1320 
      for (;;) {
1321 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
1322 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 1323 
        cursor_left(db);
1325 mateusz.vi 1324 
      }
1325 
      /* now skip to next space or start of file */
1326 
      for (;;) {
1327 mateusz.vi 1327 
        cursor_left(db);
1325 mateusz.vi 1328 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 1329 
          cursor_right(db);
1325 mateusz.vi 1330 
          break;
1331 
        }
1332 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
1333 
      }
1334 
 
1410 mateusz.vi 1335 
    } else if ((k == 0x003) || (k == 0x018)) { /* CTRL+C or CTRL+X */
1336 
      /* free clipboard if anything in it */
1337 
      if (clipboard != NULL) line_free(clipboard);
1338 
 
1339 
      /* copy cursor line to clipboard */
1340 
      clipboard = line_calloc(db->cursor->len);
1341 
      if (clipboard == NULL) {
1547 mateusz.vi 1342 
        ui_msg(10, 0, 0, SCHEME_ERR); /* ERROR */
1410 mateusz.vi 1343 
        mdr_bios_tickswait(18); /* 1s */
1344 
      } else {
1427 mateusz.vi 1345 
        mdr_cout_char_rep(db->cursorposy, 0, ' ', ((SCHEME_TEXT >> 4) | (SCHEME_TEXT << 4)) & 0xff, screenlastcol);
1410 mateusz.vi 1346 
        uidirty.from = db->cursorposy;
1347 
        uidirty.to = db->cursorposy;
1348 
        if (db->cursor->len != 0) {
1568 mateusz.vi 1349 
          fmemmove(clipboard->payload, db->cursor->payload, db->cursor->len);
1410 mateusz.vi 1350 
          clipboard->len = db->cursor->len;
1351 
        }
1352 
        mdr_bios_tickswait(2); /* ca 100ms */
1353 
 
1354 
        /* if this is about cutting the line (CTRL+X) then delete cur line */
1355 
        if ((k == 0x018) && ((db->cursor->next != NULL) || (db->cursor->prev != NULL))) {
1356 
          if (db->cursor->next) db->cursor->next->prev = db->cursor->prev;
1357 
          if (db->cursor->prev) db->cursor->prev->next = db->cursor->next;
1358 
          clipboard->prev = db->cursor;
1359 
          if (db->cursor->next) {
1360 
            db->cursor = db->cursor->next;
1361 
          } else {
1362 
            cursor_up(db);
1363 
          }
1364 
          line_free(clipboard->prev);
1423 mateusz.vi 1365 
          db->totlines -= 1;
1552 mateusz.vi 1366 
          db->modflag = 1;
1410 mateusz.vi 1367 
          uidirty.from = 0;
1368 
          uidirty.to = 0xff;
1412 mateusz.vi 1369 
          recompute_curline(db);
1410 mateusz.vi 1370 
        }
1371 
      }
1372 
 
1420 mateusz.vi 1373 
    } else if ((k == 0x016) && (clipboard != NULL)) { /* CTRL+V */
1374 
      if (line_add(db, clipboard->payload, clipboard->len) != 0) {
1547 mateusz.vi 1375 
        ui_msg(10, 0, 0, SCHEME_ERR); /* ERROR */
1420 mateusz.vi 1376 
        mdr_bios_tickswait(18); /* 1s */
1377 
      } else {
1378 
        /* rewire the linked list so the new line is on top of the previous one */
1379 
        clipboard->prev = db->cursor->prev;
1380 
        /* remove prev node from list */
1381 
        db->cursor->prev = db->cursor->prev->prev;
1382 
        if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor;
1383 
        /* insert the node after cursor now */
1384 
        clipboard->prev->next = db->cursor->next;
1385 
        if (db->cursor->next != NULL) db->cursor->next->prev = clipboard->prev;
1386 
        clipboard->prev->prev = db->cursor;
1387 
        db->cursor->next = clipboard->prev;
1388 
        cursor_down(db);
1552 mateusz.vi 1389 
        db->modflag = 1;
1410 mateusz.vi 1390 
      }
1391 
      uidirty.from = 0;
1392 
      uidirty.to = 0xff;
1412 mateusz.vi 1393 
      recompute_curline(db);
1410 mateusz.vi 1394 
 
1333 mateusz.vi 1395 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 1396 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
1397 
      char buff[4];
1398 
      const char *HEX = "0123456789ABCDEF";
1399 
      buff[0] = HEX[(k >> 8) & 15];
1400 
      buff[1] = HEX[(k >> 4) & 15];
1401 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 1402 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
1403 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1410 mateusz.vi 1404 
      mdr_dos_getkey2();
1275 mateusz.vi 1405 
      break;
1333 mateusz.vi 1406 
#endif
1275 mateusz.vi 1407 
    }
1408 
  }
1409 
 
1410 
  mdr_cout_close();
1411 
 
1414 mateusz.vi 1412 
  /* restore the DOS BREAK flag if it was originally set */
1413 
  if (original_breakflag != 0) mdr_dos_ctrlc_enable();
1414 
 
1320 mateusz.vi 1415 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 1416 
 
1347 mateusz.vi 1417 
  return;
1275 mateusz.vi 1418 
}