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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 
 
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 
 
1574 mateusz.vi 131 
unsigned short dosfread(unsigned short handle, void *buf, unsigned short count, unsigned short *bytes);
1573 mateusz.vi 132 
 
1574 mateusz.vi 133 
#pragma aux dosfread = \
134 
"mov ah, 0x3f" \
135 
"int 0x21" \
136 
"jc done" \
137 
"mov [di], ax" \
138 
"xor ax, ax" \
139 
"done:" \
140 
parm [bx] [dx] [cx] [di] \
141 
value [ax]
142 
 
143 
 
144 
 
1572 mateusz.vi 145 
/*****************************************************************************
1326 mateusz.vi 146 
 * functions                                                                 *
147 
 *****************************************************************************/
148 
 
1339 mateusz.vi 149 
static struct line far *line_calloc(unsigned short siz) {
1342 mateusz.vi 150 
  struct line far *res;
1556 mateusz.vi 151 
  unsigned short seg;
1461 mateusz.vi 152 
 
1572 mateusz.vi 153 
  seg = dosalloc((sizeof(struct line) + siz + 15) / 16);
1556 mateusz.vi 154 
  if (seg == 0) return(NULL);
1342 mateusz.vi 155 
  res = MK_FP(seg, 0);
1461 mateusz.vi 156 
  res->len = 0;
157 
  res->next = NULL;
158 
  res->prev = NULL;
159 
 
160 
  return(res);
1339 mateusz.vi 161 
}
162 
 
163 
 
164 
static void line_free(struct line far *ptr) {
1572 mateusz.vi 165 
  dosfree(FP_SEG(ptr));
1339 mateusz.vi 166 
}
167 
 
168 
 
1550 mateusz.vi 169 
static int curline_resize(struct file *db, unsigned short newsiz) {
1339 mateusz.vi 170 
  struct line far *newptr;
171 
 
1341 mateusz.vi 172 
  /* try resizing the block (much faster) */
1557 mateusz.vi 173 
  if (mdr_dos_resizeblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor)) == 0) return(0);
1339 mateusz.vi 174 
 
175 
  /* create a new block and copy data over */
176 
  newptr = line_calloc(newsiz);
1340 mateusz.vi 177 
  if (newptr == NULL) return(-1);
1568 mateusz.vi 178 
  fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
1340 mateusz.vi 179 
 
180 
  /* rewire the linked list */
181 
  db->cursor = newptr;
182 
  if (newptr->next) newptr->next->prev = newptr;
183 
  if (newptr->prev) newptr->prev->next = newptr;
184 
 
185 
  return(0);
1339 mateusz.vi 186 
}
187 
 
188 
 
1328 mateusz.vi 189 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 190 
 * returns non-zero on error */
1328 mateusz.vi 191 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 192 
  struct line far *l;
1275 mateusz.vi 193 
 
1339 mateusz.vi 194 
  l = line_calloc(slen);
1287 mateusz.vi 195 
  if (l == NULL) return(-1);
196 
 
1275 mateusz.vi 197 
  l->prev = db->cursor;
198 
  if (db->cursor) {
199 
    l->next = db->cursor->next;
200 
    db->cursor->next = l;
201 
    l->next->prev = l;
202 
  }
203 
  db->cursor = l;
1342 mateusz.vi 204 
  if (slen > 0) {
1568 mateusz.vi 205 
    fmemmove(l->payload, line, slen);
1342 mateusz.vi 206 
    l->len = slen;
207 
  }
1287 mateusz.vi 208 
 
1328 mateusz.vi 209 
  db->totlines += 1;
210 
  db->curline += 1;
211 
 
1287 mateusz.vi 212 
  return(0);
1275 mateusz.vi 213 
}
214 
 
215 
 
1348 mateusz.vi 216 
static void ui_getstring(const char *query, char *s, unsigned short maxlen) {
217 
  unsigned short len = 0;
1544 mateusz.vi 218 
  unsigned char x;
1332 mateusz.vi 219 
  int k;
220 
 
221 
  if (maxlen == 0) return;
222 
  maxlen--; /* make room for the nul terminator */
223 
 
224 
  /* print query string */
1544 mateusz.vi 225 
  x = mdr_cout_str(screenlastrow, 0, query, SCHEME_STBAR3, 40);
226 
  mdr_cout_char_rep(screenlastrow, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 227 
 
228 
  for (;;) {
1544 mateusz.vi 229 
    mdr_cout_locate(screenlastrow, x + len);
1410 mateusz.vi 230 
    k = mdr_dos_getkey2();
1332 mateusz.vi 231 
 
1345 mateusz.vi 232 
    switch (k) {
233 
      case 0x1b: /* ESC */
234 
        s[0] = 0;
235 
        return;
236 
      case '\r':
237 
        s[len] = 0;
238 
        return;
239 
      case 0x08: /* BKSPC */
240 
        if (len > 0) {
241 
          len--;
1544 mateusz.vi 242 
          mdr_cout_char(screenlastrow, x + len, ' ', SCHEME_STBAR3);
1345 mateusz.vi 243 
        }
244 
        break;
245 
      default:
246 
        if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
1544 mateusz.vi 247 
          mdr_cout_char(screenlastrow, x + len, k, SCHEME_STBAR3);
1345 mateusz.vi 248 
          s[len++] = k;
249 
        }
1332 mateusz.vi 250 
    }
1345 mateusz.vi 251 
  }
1332 mateusz.vi 252 
 
253 
}
254 
 
255 
 
1324 mateusz.vi 256 
/* append a nul-terminated string to line at cursor position */
1550 mateusz.vi 257 
static int line_append(struct file *f, const char *buf, unsigned short len) {
1427 mateusz.vi 258 
  if (sizeof(struct line) + f->cursor->len + len < len) goto ERR; /* overflow check */
259 
  if (curline_resize(f, f->cursor->len + len) != 0) goto ERR;
260 
 
1568 mateusz.vi 261 
  fmemmove(f->cursor->payload + f->cursor->len, buf, len);
1324 mateusz.vi 262 
  f->cursor->len += len;
263 
 
264 
  return(0);
1427 mateusz.vi 265 
  ERR:
266 
  return(-1);
1324 mateusz.vi 267 
}
268 
 
269 
 
1315 mateusz.vi 270 
static void db_rewind(struct file *db) {
1275 mateusz.vi 271 
  if (db->cursor == NULL) return;
272 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 273 
  db->curline = 0;
1275 mateusz.vi 274 
}
275 
 
276 
 
1541 mateusz.vi 277 
/* saves db file, resets db->modflag on success and overwrites the filename
278 
 * field if saveas is not NULL */
279 
static int savefile(struct file *db, const char *saveas) {
1539 mateusz.vi 280 
  int fd = 0;
281 
  const struct line far *l;
1556 mateusz.vi 282 
  unsigned short bytes;
1539 mateusz.vi 283 
  unsigned char eollen = 2;
284 
  const unsigned char *eolbuf = "\r\n";
285 
  int errflag = 0;
286 
 
287 
  /* if filename not overloaded then use the fname in db */
288 
  if (saveas == NULL) saveas = db->fname;
289 
 
290 
  _asm {
291 
    push ax
292 
    push cx
293 
    push dx
294 
 
295 
    mov ah, 0x3C    /* create or truncate file */
296 
    xor cx, cx      /* file attributes */
297 
    mov dx, saveas  /* works only in SMALL/TINY mode */
298 
    int 0x21
299 
    jnc DONE
300 
    mov errflag, ax
301 
    DONE:
302 
    mov fd, ax
303 
 
304 
    pop dx
305 
    pop cx
306 
    pop ax
307 
  }
308 
 
309 
  if (errflag != 0) return(-1);
310 
 
311 
  l = db->cursor;
312 
  while (l->prev) l = l->prev;
313 
 
314 
  /* preset line terminators */
315 
  if (db->lfonly) {
316 
    eolbuf++;
317 
    eollen--;
318 
  }
319 
 
320 
  while (l) {
321 
    /* do not write the last empty line, it is only useful for edition */
322 
    if (l->len != 0) {
1556 mateusz.vi 323 
      errflag |= mdr_dos_write(fd, l->payload, l->len, &bytes);
1539 mateusz.vi 324 
    } else if (l->next == NULL) {
325 
      break;
326 
    }
1556 mateusz.vi 327 
    errflag |= mdr_dos_write(fd, eolbuf, eollen, &bytes);
1539 mateusz.vi 328 
    l = l->next;
329 
  }
330 
 
1573 mateusz.vi 331 
  errflag |= dosfclose(fd);
1539 mateusz.vi 332 
 
1541 mateusz.vi 333 
  /* did it all work? */
334 
  if (errflag == 0) {
335 
    db->modflag = 0;
336 
    if (saveas != db->fname) mdr_dos_truename(db->fname, saveas);
337 
  }
338 
 
1539 mateusz.vi 339 
  return(errflag);
340 
}
341 
 
342 
 
1549 mateusz.vi 343 
static void ui_statusbar(const struct file *db) {
1356 mateusz.vi 344 
  const char *s = svarlang_strid(0); /* ESC=MENU */
1348 mateusz.vi 345 
  unsigned short helpcol = screenw - strlen(s);
1440 mateusz.vi 346 
  unsigned short col;
1275 mateusz.vi 347 
 
1425 mateusz.vi 348 
  /* slot number (guaranteed to be 0-9) */
1355 mateusz.vi 349 
  {
350 
    char slot[4] = "#00";
1549 mateusz.vi 351 
    if (db->slotid == 9) {
1425 mateusz.vi 352 
      slot[1] = '1';
353 
    } else {
1549 mateusz.vi 354 
      slot[2] += db->slotid + 1;
1425 mateusz.vi 355 
    }
1427 mateusz.vi 356 
    mdr_cout_str(screenlastrow, 0, slot, SCHEME_STBAR2, 3);
1355 mateusz.vi 357 
  }
1313 mateusz.vi 358 
 
1355 mateusz.vi 359 
  /* fill rest of status bar with background */
1427 mateusz.vi 360 
  mdr_cout_char_rep(screenlastrow, 3, ' ', SCHEME_STBAR1, helpcol - 3);
1355 mateusz.vi 361 
 
1313 mateusz.vi 362 
  /* eol type */
1330 mateusz.vi 363 
  {
364 
    const char *eoltype = "CRLF";
1353 mateusz.vi 365 
    if (db->lfonly) eoltype += 2;
1440 mateusz.vi 366 
    mdr_cout_str(screenlastrow, helpcol - 5, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 367 
  }
1313 mateusz.vi 368 
 
1438 mateusz.vi 369 
  /* line numbers */
1436 mateusz.vi 370 
  {
1438 mateusz.vi 371 
    unsigned short x;
372 
    unsigned char count = 0;
1440 mateusz.vi 373 
    col = helpcol - 7;
1438 mateusz.vi 374 
 
1439 mateusz.vi 375 
    x = db->totlines;
1438 mateusz.vi 376 
    AGAIN:
1436 mateusz.vi 377 
    do {
1439 mateusz.vi 378 
      mdr_cout_char(screenlastrow, col--, '0' + (x % 10), SCHEME_STBAR1);
1436 mateusz.vi 379 
      x /= 10;
380 
    } while (x);
1438 mateusz.vi 381 
    /* redo same exercise, but printing the current line now */
382 
    if (count == 0) {
383 
      count = 1;
1439 mateusz.vi 384 
      mdr_cout_char(screenlastrow, col--, '/', SCHEME_STBAR1);
1438 mateusz.vi 385 
      x = 1 + db->curline;
386 
      goto AGAIN;
387 
    }
1440 mateusz.vi 388 
  }
1438 mateusz.vi 389 
 
1440 mateusz.vi 390 
  /* filename and modflag */
391 
  {
392 
    const char *fn;
393 
    unsigned short x;
394 
    unsigned short maxfnlen = col - 6;
395 
    if (db->fname[0] == 0) {
396 
      fn = svarlang_str(0, 1); /* "UNTITLED" */
397 
    } else {
398 
      /* display filename up to maxfnlen chars */
399 
      fn = db->fname;
400 
      x = strlen(fn);
401 
      if (x > maxfnlen) fn += x - maxfnlen;
402 
    }
403 
    x = mdr_cout_str(screenlastrow, 4, fn, SCHEME_STBAR1, maxfnlen);
404 
    if (db->modflag) mdr_cout_char(screenlastrow, 5 + x, '!', SCHEME_STBAR2);
1436 mateusz.vi 405 
  }
406 
 
1427 mateusz.vi 407 
  mdr_cout_str(screenlastrow, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 408 
}
409 
 
410 
 
1547 mateusz.vi 411 
static void ui_msg(unsigned short msgid1, unsigned short msgid2, unsigned short msgid3, unsigned char attr) {
412 
  unsigned short x, y, maxmsglen, i;
413 
  unsigned short msgcount = 1;
414 
  const char *msg[3];
1331 mateusz.vi 415 
 
1547 mateusz.vi 416 
  msg[0] = svarlang_strid(msgid1);
417 
 
418 
  if (msgid2 != 0) {
419 
    msgcount = 2;
420 
    msg[1] = svarlang_strid(msgid2);
1331 mateusz.vi 421 
  }
1547 mateusz.vi 422 
  if (msgid3 != 0) {
423 
    msgcount = 3;
424 
    msg[2] = svarlang_strid(msgid3);
425 
  }
1331 mateusz.vi 426 
 
1547 mateusz.vi 427 
  /* find longest msg */
428 
  maxmsglen = 0;
429 
  for (i = 0; i < msgcount; i++) {
430 
    y = strlen(msg[i]);
431 
    if (y > maxmsglen) maxmsglen = y;
432 
  }
433 
 
1331 mateusz.vi 434 
  y = (screenh - 6) >> 1;
1547 mateusz.vi 435 
  x = (screenw - maxmsglen - 3) >> 1;
436 
  for (i = y+1+msgcount; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, maxmsglen + 2);
1331 mateusz.vi 437 
  x++;
1345 mateusz.vi 438 
 
1547 mateusz.vi 439 
  for (i = 0; i < msgcount; i++) {
440 
    mdr_cout_str(y+1+i, x, msg[i], attr, maxmsglen);
441 
  }
1312 mateusz.vi 442 
 
1327 mateusz.vi 443 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 444 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 445 
}
446 
 
447 
 
1539 mateusz.vi 448 
/* returns 0 if operation may proceed, non-zero to cancel */
1541 mateusz.vi 449 
static unsigned char ui_confirm_if_unsaved(struct file *db) {
1539 mateusz.vi 450 
  int k;
451 
 
1342 mateusz.vi 452 
  if (db->modflag == 0) return(0);
453 
 
1355 mateusz.vi 454 
  mdr_cout_cursor_hide();
455 
 
1539 mateusz.vi 456 
  /* if file has been modified then ask for confirmation:
457 
   * ENTER        : agree to data loss
458 
   * SPACE        : SAVE file before quit (only if valid filename present)
459 
   * anything else: ABORT */
1547 mateusz.vi 460 
  ui_msg(4, 5, (db->fname[0])?9:8, SCHEME_MSG);
1342 mateusz.vi 461 
 
1539 mateusz.vi 462 
  k = mdr_dos_getkey2();
1355 mateusz.vi 463 
  mdr_cout_cursor_show();
464 
 
1539 mateusz.vi 465 
  /* ENTER = agree to loose unsaved data */
466 
  if (k == '\r') return(0);
467 
 
468 
  /* SPACE = save file and continue */
469 
  if ((k == ' ') && (db->fname[0] != 0) && (savefile(db, NULL) == 0)) return(0);
470 
 
471 
  /* any other key = cancel operation */
472 
  return(1);
1342 mateusz.vi 473 
}
474 
 
475 
 
1327 mateusz.vi 476 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 477 
  unsigned char x;
1310 mateusz.vi 478 
  const struct line far *l;
1316 mateusz.vi 479 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 480 
 
1392 mateusz.vi 481 
  /* quit early if nothing to refresh */
482 
  if (uidirty.from == 0xff) return;
483 
 
1288 mateusz.vi 484 
#ifdef DBG_REFRESH
1282 mateusz.vi 485 
  static char m = 'a';
486 
  m++;
487 
  if (m > 'z') m = 'a';
1288 mateusz.vi 488 
#endif
1282 mateusz.vi 489 
 
1310 mateusz.vi 490 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 491 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 492 
 
1310 mateusz.vi 493 
  /* iterate over lines and redraw whatever needs to be redrawn */
494 
  for (; l != NULL; l = l->next, y++) {
495 
 
496 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 497 
    if (y < uidirty.from) continue;
498 
    if (y > uidirty.to) break;
1282 mateusz.vi 499 
 
1318 mateusz.vi 500 
    x = 0;
1275 mateusz.vi 501 
    if (db->xoffset < l->len) {
1318 mateusz.vi 502 
      unsigned char i, limit;
503 
      if (l->len - db->xoffset < screenw) {
504 
        limit = l->len;
505 
      } else {
1427 mateusz.vi 506 
        limit = db->xoffset + screenlastcol;
1318 mateusz.vi 507 
      }
1333 mateusz.vi 508 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 509 
    }
1282 mateusz.vi 510 
 
1318 mateusz.vi 511 
    /* write empty spaces until end of line */
1427 mateusz.vi 512 
    if (x < screenlastcol) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenlastcol - x);
1318 mateusz.vi 513 
 
1288 mateusz.vi 514 
#ifdef DBG_REFRESH
1333 mateusz.vi 515 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 516 
#endif
1282 mateusz.vi 517 
 
1275 mateusz.vi 518 
    if (y == screenh - 2) break;
519 
  }
1310 mateusz.vi 520 
 
1319 mateusz.vi 521 
  /* fill all lines below if empty (and they need to be redrawn) */
522 
  if (l == NULL) {
1427 mateusz.vi 523 
    while ((y < screenlastrow) && (y < uidirty.to)) {
524 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenlastcol);
1319 mateusz.vi 525 
    }
1318 mateusz.vi 526 
  }
1328 mateusz.vi 527 
 
528 
  /* scroll bar */
1427 mateusz.vi 529 
  for (y = 0; y < screenlastrow; y++) {
530 
    mdr_cout_char(y, screenlastcol, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 531 
  }
532 
 
533 
  /* scroll cursor */
534 
  if (db->totlines >= screenh) {
535 
    unsigned short topline = db->curline - db->cursorposy;
536 
    unsigned short col;
537 
    unsigned short totlines = db->totlines - screenh + 1;
538 
    if (db->totlines - screenh > screenh) {
1427 mateusz.vi 539 
      col = topline / (totlines / screenlastrow);
1328 mateusz.vi 540 
    } else {
1427 mateusz.vi 541 
      col = topline * screenlastrow / totlines;
1328 mateusz.vi 542 
    }
1427 mateusz.vi 543 
    if (col >= screenlastrow) col = screenh - 2;
544 
    mdr_cout_char(col, screenlastcol, ' ', SCHEME_SCROLL);
1328 mateusz.vi 545 
  }
1392 mateusz.vi 546 
 
547 
  /* clear out the dirty flag */
548 
  uidirty.from = 0xff;
1275 mateusz.vi 549 
}
550 
 
551 
 
1327 mateusz.vi 552 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 553 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 554 
 
555 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 556 
    db->cursorposx = 0;
1275 mateusz.vi 557 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 558 
    uidirty.from = 0;
559 
    uidirty.to = 0xff;
1275 mateusz.vi 560 
  } else {
1316 mateusz.vi 561 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 562 
  }
563 
}
564 
 
565 
 
1327 mateusz.vi 566 
static void cursor_up(struct file *db) {
1422 mateusz.vi 567 
  if (db->cursor->prev == NULL) return;
568 
 
569 
  db->curline -= 1;
570 
  db->cursor = db->cursor->prev;
571 
  if (db->cursorposy == 0) {
572 
    uidirty.from = 0;
573 
    uidirty.to = 0xff;
574 
  } else {
575 
    db->cursorposy -= 1;
1275 mateusz.vi 576 
  }
577 
}
578 
 
579 
 
1327 mateusz.vi 580 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 581 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 582 
  if (db->xoffset > db->cursor->len) {
583 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 584 
    uidirty.from = 0;
585 
    uidirty.to = 0xff;
1282 mateusz.vi 586 
  }
587 
 
1427 mateusz.vi 588 
  if (db->xoffset + screenlastcol <= db->cursor->len) {
1282 mateusz.vi 589 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 590 
    uidirty.from = 0;
591 
    uidirty.to = 0xff;
1282 mateusz.vi 592 
  }
1316 mateusz.vi 593 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 594 
}
595 
 
596 
 
1327 mateusz.vi 597 
static void cursor_down(struct file *db) {
1422 mateusz.vi 598 
  if (db->cursor->next == NULL) return;
599 
 
600 
  db->curline += 1;
601 
  db->cursor = db->cursor->next;
602 
  if (db->cursorposy < screenh - 2) {
603 
    db->cursorposy += 1;
604 
  } else {
605 
    uidirty.from = 0;
606 
    uidirty.to = 0xff;
1276 mateusz.vi 607 
  }
608 
}
609 
 
610 
 
1327 mateusz.vi 611 
static void cursor_left(struct file *db) {
1316 mateusz.vi 612 
  if (db->cursorposx > 0) {
613 
    db->cursorposx -= 1;
1302 mateusz.vi 614 
  } else if (db->xoffset > 0) {
615 
    db->xoffset -= 1;
1327 mateusz.vi 616 
    uidirty.from = 0;
617 
    uidirty.to = 0xff;
1302 mateusz.vi 618 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 619 
    cursor_up(db);
620 
    cursor_eol(db);
1302 mateusz.vi 621 
  }
622 
}
623 
 
624 
 
1327 mateusz.vi 625 
static void cursor_home(struct file *db) {
1316 mateusz.vi 626 
  db->cursorposx = 0;
1282 mateusz.vi 627 
  if (db->xoffset != 0) {
628 
    db->xoffset = 0;
1327 mateusz.vi 629 
    uidirty.from = 0;
630 
    uidirty.to = 0xff;
1282 mateusz.vi 631 
  }
1276 mateusz.vi 632 
}
633 
 
634 
 
1327 mateusz.vi 635 
static void cursor_right(struct file *db) {
1316 mateusz.vi 636 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
637 
    if (db->cursorposx < screenw - 2) {
638 
      db->cursorposx += 1;
1308 mateusz.vi 639 
    } else {
640 
      db->xoffset += 1;
1327 mateusz.vi 641 
      uidirty.from = 0;
642 
      uidirty.to = 0xff;
1308 mateusz.vi 643 
    }
1357 mateusz.vi 644 
  } else if (db->cursor->next != NULL) { /* jump to start of next line */
1327 mateusz.vi 645 
    cursor_down(db);
646 
    cursor_home(db);
1308 mateusz.vi 647 
  }
648 
}
649 
 
650 
 
1327 mateusz.vi 651 
static void del(struct file *db) {
1316 mateusz.vi 652 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
1568 mateusz.vi 653 
    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 654 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 655 
    uidirty.from = db->cursorposy;
656 
    uidirty.to = db->cursorposy;
1393 mateusz.vi 657 
    db->modflag = 1;
1292 mateusz.vi 658 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
659 
    struct line far *nextline = db->cursor->next;
660 
    if (db->cursor->next->len > 0) {
1340 mateusz.vi 661 
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
1568 mateusz.vi 662 
        fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 663 
        db->cursor->len += db->cursor->next->len;
664 
      }
665 
    }
1340 mateusz.vi 666 
 
1292 mateusz.vi 667 
    db->cursor->next = db->cursor->next->next;
668 
    db->cursor->next->prev = db->cursor;
1340 mateusz.vi 669 
 
1339 mateusz.vi 670 
    line_free(nextline);
1327 mateusz.vi 671 
    uidirty.from = db->cursorposy;
672 
    uidirty.to = 0xff;
1328 mateusz.vi 673 
    db->totlines -= 1;
1393 mateusz.vi 674 
    db->modflag = 1;
1292 mateusz.vi 675 
  }
676 
}
677 
 
678 
 
1327 mateusz.vi 679 
static void bkspc(struct file *db) {
1302 mateusz.vi 680 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1421 mateusz.vi 681 
  if ((db->cursorposx + db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 682 
 
1327 mateusz.vi 683 
  cursor_left(db);
684 
  del(db);
1302 mateusz.vi 685 
}
686 
 
687 
 
1450 mateusz.vi 688 
#define LOADFILE_FILENOTFOUND 2
689 
 
1346 mateusz.vi 690 
/* returns 0 on success, 1 on file not found, 2 on other error */
1449 mateusz.vi 691 
static unsigned char loadfile(struct file *db, const char *fname) {
1324 mateusz.vi 692 
  char *buffptr;
1556 mateusz.vi 693 
  unsigned short len, llen;
694 
  unsigned short fd;
1324 mateusz.vi 695 
  unsigned char eolfound;
1449 mateusz.vi 696 
  unsigned char err = 0;
1287 mateusz.vi 697 
 
1355 mateusz.vi 698 
  /* free the entire linked list of lines */
699 
  db_rewind(db);
700 
  while (db->cursor) {
701 
    struct line far *victim;
702 
    victim = db->cursor;
703 
    db->cursor = db->cursor->next;
704 
    line_free(victim);
705 
  }
1321 mateusz.vi 706 
 
1551 mateusz.vi 707 
  /* zero out the struct (take care to preserve the id of the slot, though) */
708 
  {
709 
    unsigned char slotid = db->slotid;
710 
    bzero(db, sizeof(struct file));
711 
    db->slotid = slotid;
712 
  }
1355 mateusz.vi 713 
 
1448 mateusz.vi 714 
  /* start by adding an empty line */
715 
  if (line_add(db, NULL, 0) != 0) return(2);
716 
 
1418 mateusz.vi 717 
  if (fname == NULL) goto SKIPLOADING;
1321 mateusz.vi 718 
 
1543 mateusz.vi 719 
  /* make the filename canonical (DOS 3+ only, on earlier versions it just copies the filename) */
720 
  mdr_dos_truename(db->fname, fname);
1355 mateusz.vi 721 
 
1565 mateusz.vi 722 
  /* fopen file */
723 
  fd = 0;
724 
  _asm {
725 
    push cx
726 
    push dx
727 
 
728 
    mov ax, 0x3d00
729 
    mov dx, fname   // works only in SMALL memory model!
730 
    xor cl, cl
731 
    int 0x21
732 
    mov fd, ax
733 
    jnc done
734 
    mov err, al
735 
    done:
736 
 
737 
    pop dx
738 
    pop cx
739 
  }
740 
 
1450 mateusz.vi 741 
  if (err != 0) goto SKIPLOADING;
1287 mateusz.vi 742 
 
1313 mateusz.vi 743 
  db->lfonly = 1;
744 
 
1324 mateusz.vi 745 
  for (eolfound = 0;;) {
746 
    unsigned short consumedbytes;
747 
 
1574 mateusz.vi 748 
    if ((dosfread(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
1324 mateusz.vi 749 
    buffptr = buff;
750 
 
751 
    FINDLINE:
752 
 
1361 mateusz.vi 753 
    /* look for nearest \n (also expand tabs) */
1324 mateusz.vi 754 
    for (consumedbytes = 0;; consumedbytes++) {
1361 mateusz.vi 755 
 
756 
      if (buffptr[consumedbytes] == '\t') {
757 
        llen = consumedbytes;
758 
        break;
759 
      }
760 
 
1324 mateusz.vi 761 
      if (consumedbytes == len) {
762 
        llen = consumedbytes;
763 
        break;
1323 mateusz.vi 764 
      }
1324 mateusz.vi 765 
      if (buffptr[consumedbytes] == '\r') {
766 
        llen = consumedbytes;
767 
        consumedbytes++;
768 
        db->lfonly = 0;
1320 mateusz.vi 769 
        break;
770 
      }
1324 mateusz.vi 771 
      if (buffptr[consumedbytes] == '\n') {
772 
        eolfound = 1;
773 
        llen = consumedbytes;
774 
        consumedbytes++;
775 
        break;
776 
      }
1287 mateusz.vi 777 
    }
1324 mateusz.vi 778 
 
779 
    /* consumedbytes is the amount of bytes processed from buffptr,
780 
     * llen is the length of line's payload (without its line terminator) */
781 
 
782 
    /* append content, if line is non-empty */
783 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1339 mateusz.vi 784 
      goto IOERR;
1287 mateusz.vi 785 
    }
786 
 
1419 mateusz.vi 787 
    /* allocate the next line if current line ended */
1324 mateusz.vi 788 
    if (eolfound) {
1328 mateusz.vi 789 
      if (line_add(db, NULL, 0) != 0) {
1339 mateusz.vi 790 
        goto IOERR;
1324 mateusz.vi 791 
      }
792 
      eolfound = 0;
793 
    }
1287 mateusz.vi 794 
 
1361 mateusz.vi 795 
    /* append 8 spaces if tab char found */
1412 mateusz.vi 796 
    if ((consumedbytes < len) && (buffptr[consumedbytes] == '\t') && (glob_tablessmode == 0)) {
1361 mateusz.vi 797 
      consumedbytes++;
798 
      if (line_append(db, "        ", 8) != 0) {
799 
        goto IOERR;
800 
      }
801 
    }
802 
 
1324 mateusz.vi 803 
    /* anything left? process the buffer leftover again */
804 
    if (consumedbytes < len) {
805 
      len -= consumedbytes;
806 
      buffptr += consumedbytes;
807 
      goto FINDLINE;
808 
    }
809 
 
810 
  }
811 
 
1573 mateusz.vi 812 
  dosfclose(fd);
1287 mateusz.vi 813 
 
1321 mateusz.vi 814 
  SKIPLOADING:
815 
 
1448 mateusz.vi 816 
  /* rewind cursor to top of file because it has been used by line_add() */
1339 mateusz.vi 817 
  db_rewind(db);
1320 mateusz.vi 818 
 
1448 mateusz.vi 819 
  return(err);
1339 mateusz.vi 820 
 
821 
  IOERR:
1573 mateusz.vi 822 
  dosfclose(fd);
1450 mateusz.vi 823 
  return(1);
1287 mateusz.vi 824 
}
825 
 
826 
 
1356 mateusz.vi 827 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
828 
 * of argc and argv, saves some 330 bytes of binary size
829 
 * returns non-zero on error */
830 
static int parseargv(struct file *dbarr) {
831 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
832 
  unsigned short count = 0;
833 
  char *arg;
834 
  unsigned short lastarg = 0;
1449 mateusz.vi 835 
  unsigned char err;
1356 mateusz.vi 836 
 
837 
  while (!lastarg) {
838 
    /* jump to nearest arg */
839 
    while (*tail == ' ') {
840 
      *tail = 0;
841 
      tail++;
842 
    }
843 
 
844 
    if (*tail == '\r') {
845 
      *tail = 0;
846 
      break;
847 
    }
848 
 
849 
    arg = tail;
850 
 
851 
    /* jump to next delimiter */
852 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
853 
 
854 
    /* if \r then remember this is the last arg */
855 
    if (*tail == '\r') lastarg = 1;
856 
 
857 
    *tail = 0;
858 
    tail++;
859 
 
860 
    /* look at the arg now */
861 
    if (*arg == '/') {
1412 mateusz.vi 862 
      if (arg[1] == 't') { /* /t = do not expand tabs */
863 
        glob_tablessmode = 1;
864 
 
865 
      } else if (arg[1] == 'm') { /* /m = force mono mode */
866 
        glob_monomode = 1;
867 
 
868 
      } else {  /* help screen */
1419 mateusz.vi 869 
        mdr_coutraw_str(svarlang_str(1,3)); /* Sved, the SvarDOS editor */
1412 mateusz.vi 870 
        mdr_coutraw_str(" [");
1419 mateusz.vi 871 
        mdr_coutraw_str(svarlang_str(1,4)); /* ver */
1412 mateusz.vi 872 
        mdr_coutraw_puts(" " PVER "]");
873 
        mdr_coutraw_puts("Copyright (C) " PDATE " Mateusz Viste");
874 
        mdr_coutraw_crlf();
1433 mateusz.vi 875 
        mdr_coutraw_str("sved [/m] [/t] ");
1412 mateusz.vi 876 
        mdr_coutraw_puts(svarlang_str(1,1)); /* args syntax */
877 
        mdr_coutraw_crlf();
878 
        mdr_coutraw_puts(svarlang_str(1,10)); /* /m */
879 
        mdr_coutraw_puts(svarlang_str(1,11)); /* /t */
880 
        return(-1);
1387 mateusz.vi 881 
      }
1412 mateusz.vi 882 
      continue;
1356 mateusz.vi 883 
    }
884 
 
885 
    /* looks to be a filename */
886 
    if (count == 10) {
1420 mateusz.vi 887 
      mdr_coutraw_puts(svarlang_str(0,12)); /* too many files */
888 
      return(-1);
1356 mateusz.vi 889 
    }
890 
 
891 
    /* try loading it */
1387 mateusz.vi 892 
    mdr_coutraw_str(svarlang_str(1,2));
893 
    mdr_coutraw_char(' ');
1356 mateusz.vi 894 
    mdr_coutraw_puts(arg);
895 
    err = loadfile(&(dbarr[count]), arg);
896 
    if (err) {
1450 mateusz.vi 897 
      if (err == LOADFILE_FILENOTFOUND) { /* file not found */
1396 mateusz.vi 898 
        if ((count == 0) && (lastarg != 0)) { /* a 'file not found' is fine if only one file was given */
899 
          err = 0;
900 
        } else {
901 
          err = 11;
902 
        }
1356 mateusz.vi 903 
      } else { /* general error */
904 
        err = 10;
905 
      }
1396 mateusz.vi 906 
      if (err) {
907 
        mdr_coutraw_puts(svarlang_str(0,err));
908 
        return(-1);
909 
      }
1356 mateusz.vi 910 
    }
911 
    count++;
912 
  }
913 
 
914 
  return(0);
915 
}
916 
 
917 
 
1327 mateusz.vi 918 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1340 mateusz.vi 919 
  if (curline_resize(db, db->cursor->len + len) == 0) {
1317 mateusz.vi 920 
    unsigned short off = db->xoffset + db->cursorposx;
1393 mateusz.vi 921 
    db->modflag = 1;
1568 mateusz.vi 922 
    fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
1317 mateusz.vi 923 
    db->cursor->len += len;
1327 mateusz.vi 924 
    uidirty.from = db->cursorposy;
925 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 926 
    while (len--) {
927 
      db->cursor->payload[off++] = *databuf;
928 
      databuf++;
1327 mateusz.vi 929 
      cursor_right(db);
1317 mateusz.vi 930 
    }
931 
  }
932 
}
933 
 
934 
 
1343 mateusz.vi 935 
/* recompute db->curline by counting nodes in linked list */
936 
static void recompute_curline(struct file *db) {
937 
  const struct line far *l = db->cursor;
938 
 
939 
  db->curline = 0;
940 
  while (l->prev != NULL) {
941 
    db->curline += 1;
942 
    l = l->prev;
943 
  }
944 
}
945 
 
946 
 
1354 mateusz.vi 947 
enum MENU_ACTION {
1393 mateusz.vi 948 
  MENU_NONE   = 0,
949 
  MENU_OPEN   = 1,
950 
  MENU_SAVE   = 2,
951 
  MENU_SAVEAS = 3,
952 
  MENU_CLOSE  = 4,
953 
  MENU_CHGEOL = 5,
1418 mateusz.vi 954 
  MENU_QUIT   = 6
1354 mateusz.vi 955 
};
956 
 
957 
static enum MENU_ACTION ui_menu(void) {
958 
  unsigned short i, curchoice, attr, x, slen;
1393 mateusz.vi 959 
  unsigned short xorigin, yorigin;
1354 mateusz.vi 960 
 
961 
  /* find out the longest string */
962 
  slen = 0;
1355 mateusz.vi 963 
  for (i = MENU_OPEN; i <= MENU_QUIT; i++) {
1354 mateusz.vi 964 
    x = strlen(svarlang_str(8, i));
965 
    if (x > slen) slen = x;
966 
  }
967 
 
1393 mateusz.vi 968 
  /* calculate where to draw the menu on screen */
969 
  xorigin = (screenw - (slen + 5)) / 2;
1395 mateusz.vi 970 
  yorigin = (screenh - (MENU_QUIT - MENU_OPEN + 6)) / 2;
1393 mateusz.vi 971 
 
1395 mateusz.vi 972 
  /* */
973 
  uidirty.from = yorigin;
974 
  uidirty.to = 0xff;
975 
  uidirty.statusbar = 1;
976 
 
977 
  /* hide the cursor */
978 
  mdr_cout_cursor_hide();
979 
 
1355 mateusz.vi 980 
  curchoice = MENU_OPEN;
1354 mateusz.vi 981 
  for (;;) {
982 
    /* render menu */
1393 mateusz.vi 983 
    for (i = MENU_NONE; i <= MENU_QUIT + 1; i++) {
984 
      mdr_cout_char_rep(yorigin + i, xorigin, ' ', SCHEME_MENU, slen+4);
1354 mateusz.vi 985 
      if (i == curchoice) {
986 
        attr = SCHEME_MENU_CUR;
1415 mateusz.vi 987 
        mdr_cout_char_rep(yorigin + i, xorigin + 1, ' ', SCHEME_MENU_SEL, slen + 2);
1354 mateusz.vi 988 
      } else {
989 
        attr = SCHEME_MENU;
990 
      }
1416 mateusz.vi 991 
      mdr_cout_str(yorigin + i, xorigin + 2, svarlang_str(8, i), attr, slen);
1354 mateusz.vi 992 
    }
993 
    /* wait for key */
1410 mateusz.vi 994 
    switch (mdr_dos_getkey2()) {
1354 mateusz.vi 995 
      case 0x150: /* down */
996 
        if (curchoice == MENU_QUIT) {
1355 mateusz.vi 997 
          curchoice = MENU_OPEN;
1354 mateusz.vi 998 
        } else {
999 
          curchoice++;
1000 
        }
1001 
        break;
1002 
      case 0x148: /* up */
1355 mateusz.vi 1003 
        if (curchoice == MENU_OPEN) {
1354 mateusz.vi 1004 
          curchoice = MENU_QUIT;
1005 
        } else {
1006 
          curchoice--;
1007 
        }
1008 
        break;
1395 mateusz.vi 1009 
      default:
1010 
        curchoice = MENU_NONE;
1011 
        /* FALLTHRU */
1012 
      case '\r': /* ENTER */
1013 
        mdr_cout_cursor_show();
1014 
        return(curchoice);
1354 mateusz.vi 1015 
    }
1016 
  }
1017 
}
1018 
 
1019 
 
1549 mateusz.vi 1020 
static struct file *select_slot(struct file *dbarr, unsigned short curfile) {
1355 mateusz.vi 1021 
  uidirty.from = 0;
1022 
  uidirty.to = 0xff;
1023 
  uidirty.statusbar = 1;
1024 
 
1025 
  dbarr = &(dbarr[curfile]);
1549 mateusz.vi 1026 
 
1415 mateusz.vi 1027 
  /* force redraw now, because the main() routine might not if this is exit
1028 
   * time and we want to show the user which file has unsaved changes */
1549 mateusz.vi 1029 
  ui_statusbar(dbarr);
1355 mateusz.vi 1030 
  ui_refresh(dbarr);
1031 
  return(dbarr);
1032 
}
1033 
 
1034 
 
1347 mateusz.vi 1035 
/* main returns nothing, ie. sved always exits with a zero exit code
1036 
 * (this saves 20 bytes of executable footprint) */
1037 
void main(void) {
1355 mateusz.vi 1038 
  static struct file dbarr[10];
1039 
  struct file *db = dbarr; /* visible file is the first slot by default */
1548 mateusz.vi 1040 
  static struct line far *clipboard;
1538 mateusz.vi 1041 
  static unsigned char original_breakflag;
1275 mateusz.vi 1042 
 
1418 mateusz.vi 1043 
  { /* load NLS resource */
1364 mateusz.vi 1044 
    unsigned short i = 0;
1045 
    const char far *selfptr;
1548 mateusz.vi 1046 
    char lang[8];
1364 mateusz.vi 1047 
    selfptr = mdr_dos_selfexe();
1048 
    if (selfptr != NULL) {
1049 
      do {
1548 mateusz.vi 1050 
        buff[i] = selfptr[i];
1051 
      } while (buff[i++] != 0);
1052 
      svarlang_autoload_exepath(buff, mdr_dos_getenv(lang, "LANG", sizeof(lang)));
1364 mateusz.vi 1053 
    }
1307 mateusz.vi 1054 
  }
1282 mateusz.vi 1055 
 
1355 mateusz.vi 1056 
  /* preload all slots with empty files */
1549 mateusz.vi 1057 
  {
1058 
    unsigned short i;
1059 
    for (i = 0; i < 10; i++) {
1060 
      loadfile(&(dbarr[i]), NULL);
1061 
      dbarr[i].slotid = i;
1062 
    }
1355 mateusz.vi 1063 
  }
1064 
 
1356 mateusz.vi 1065 
  /* parse argv (and load files, if any passed on) */
1066 
  if (parseargv(dbarr) != 0) return;
1282 mateusz.vi 1067 
 
1412 mateusz.vi 1068 
  if ((mdr_cout_init(&screenw, &screenh) != 0) && (glob_monomode == 0)) {
1333 mateusz.vi 1069 
    /* load color scheme if mdr_cout_init returns a color flag */
1070 
    SCHEME_TEXT = 0x17;
1354 mateusz.vi 1071 
    SCHEME_MENU = 0x70;
1388 mateusz.vi 1072 
    SCHEME_MENU_CUR = 0x6f;
1073 
    SCHEME_MENU_SEL = 0x66;
1333 mateusz.vi 1074 
    SCHEME_STBAR1 = 0x70;
1075 
    SCHEME_STBAR2 = 0x78;
1392 mateusz.vi 1076 
    SCHEME_STBAR3 = 0x3f;
1333 mateusz.vi 1077 
    SCHEME_SCROLL = 0x70;
1388 mateusz.vi 1078 
    SCHEME_MSG = 0x6f;
1333 mateusz.vi 1079 
    SCHEME_ERR = 0x4f;
1080 
  }
1427 mateusz.vi 1081 
  screenlastrow = screenh - 1;
1082 
  screenlastcol = screenw - 1;
1275 mateusz.vi 1083 
 
1414 mateusz.vi 1084 
  /* instruct DOS to stop detecting CTRL+C because user needs it for
1085 
   * copy/paste operations. also remember the original status of the BREAK
1086 
   * flag so I can restore it as it was before quitting. */
1087 
  original_breakflag = mdr_dos_ctrlc_disable();
1410 mateusz.vi 1088 
 
1275 mateusz.vi 1089 
  for (;;) {
1090 
    int k;
1091 
 
1362 mateusz.vi 1092 
    /* add an extra empty line if cursor is on last line and this line is not empty */
1093 
    if ((db->cursor->next == NULL) && (db->cursor->len != 0)) {
1094 
      if (line_add(db, NULL, 0) == 0) {
1095 
        db->cursor = db->cursor->prev; /* line_add() changes the cursor pointer */
1437 mateusz.vi 1096 
        db->curline -= 1;
1362 mateusz.vi 1097 
      }
1098 
    }
1099 
 
1327 mateusz.vi 1100 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 1101 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 1102 
 
1392 mateusz.vi 1103 
    ui_refresh(db);
1104 
 
1436 mateusz.vi 1105 
    if ((uidirty.statusbar != 0) || (db->modflagprev != db->modflag) || (db->curline_prev != db->curline)) {
1549 mateusz.vi 1106 
      ui_statusbar(db);
1342 mateusz.vi 1107 
      uidirty.statusbar = 0;
1355 mateusz.vi 1108 
      db->modflagprev = db->modflag;
1436 mateusz.vi 1109 
      db->curline_prev = db->curline;
1342 mateusz.vi 1110 
    }
1328 mateusz.vi 1111 
#ifdef DBG_LINENUM
1112 
      {
1113 
        char ddd[10];
1114 
        db->curline += 1;
1115 
        ddd[0] = '0' + db->curline / 100;
1116 
        ddd[1] = '0' + (db->curline % 100) / 10;
1117 
        ddd[2] = '0' + (db->curline % 10);
1118 
        db->curline -= 1;
1119 
        ddd[3] = '/';
1120 
        ddd[4] = '0' + db->totlines / 100;
1121 
        ddd[5] = '0' + (db->totlines % 100) / 10;
1122 
        ddd[6] = '0' + (db->totlines % 10);
1123 
        ddd[7] = 0;
1333 mateusz.vi 1124 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 1125 
      }
1126 
#endif
1275 mateusz.vi 1127 
 
1410 mateusz.vi 1128 
    k = mdr_dos_getkey2();
1282 mateusz.vi 1129 
 
1275 mateusz.vi 1130 
    if (k == 0x150) { /* down */
1327 mateusz.vi 1131 
      cursor_down(db);
1275 mateusz.vi 1132 
 
1133 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 1134 
      cursor_up(db);
1275 mateusz.vi 1135 
 
1136 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 1137 
      cursor_right(db);
1275 mateusz.vi 1138 
 
1139 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 1140 
      cursor_left(db);
1275 mateusz.vi 1141 
 
1282 mateusz.vi 1142 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 1143 
      unsigned char dist = db->cursorposy + screenh - 1;
1144 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
1145 
        db->cursor = db->cursor->prev;
1146 
        dist--;
1147 
      }
1148 
      if (dist != 0) {
1149 
        db->cursorposy = 0;
1150 
        db->cursorposx = 0;
1151 
      } else {
1152 
        dist = db->cursorposy;
1153 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
1154 
      }
1155 
      uidirty.from = 0;
1156 
      uidirty.to = 0xff;
1343 mateusz.vi 1157 
      recompute_curline(db);
1282 mateusz.vi 1158 
 
1159 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 1160 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
1161 
      while ((dist != 0) && (db->cursor->next != NULL)) {
1162 
        db->cursor = db->cursor->next;
1163 
        dist--;
1164 
      }
1165 
      if (dist != 0) {
1166 
        db->cursorposy = screenh - 2;
1167 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
1168 
        db->cursorposx = 0;
1169 
      } else {
1170 
        dist = screenh - 2 - db->cursorposy;
1171 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
1172 
      }
1173 
      uidirty.from = 0;
1174 
      uidirty.to = 0xff;
1343 mateusz.vi 1175 
      recompute_curline(db);
1282 mateusz.vi 1176 
 
1177 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 1178 
       cursor_home(db);
1282 mateusz.vi 1179 
 
1180 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 1181 
       cursor_eol(db);
1282 mateusz.vi 1182 
 
1275 mateusz.vi 1183 
    } else if (k == 0x1B) { /* ESC */
1354 mateusz.vi 1184 
      int quitnow = 0;
1394 mateusz.vi 1185 
      char fname[64];
1354 mateusz.vi 1186 
      int saveflag = 0;
1393 mateusz.vi 1187 
      enum MENU_ACTION ui_action;
1275 mateusz.vi 1188 
 
1392 mateusz.vi 1189 
      /* collect the exact menu action and clear the screen */
1190 
      ui_action = ui_menu();
1191 
      ui_refresh(db);
1354 mateusz.vi 1192 
 
1392 mateusz.vi 1193 
      switch (ui_action) {
1194 
 
1354 mateusz.vi 1195 
        case MENU_NONE:
1196 
          break;
1197 
 
1198 
        case MENU_OPEN:
1199 
          /* display a warning if unsaved changes are pending */
1547 mateusz.vi 1200 
          if (db->modflag != 0) ui_msg(4, 8, 0, SCHEME_MSG);
1354 mateusz.vi 1201 
 
1202 
          /* ask for filename */
1203 
          ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
1204 
          if (fname[0] != 0) {
1449 mateusz.vi 1205 
            unsigned char err;
1354 mateusz.vi 1206 
            err = loadfile(db, fname);
1207 
            if (err != 0) {
1450 mateusz.vi 1208 
              if (err == LOADFILE_FILENOTFOUND) {
1547 mateusz.vi 1209 
                ui_msg(11, 0, 0, SCHEME_ERR); /* file not found */
1354 mateusz.vi 1210 
              } else {
1547 mateusz.vi 1211 
                ui_msg(10, 0, 0, SCHEME_ERR);  /* ERROR */
1354 mateusz.vi 1212 
              }
1213 
              mdr_bios_tickswait(44); /* 3s */
1418 mateusz.vi 1214 
              loadfile(db, NULL);
1354 mateusz.vi 1215 
            }
1216 
          }
1393 mateusz.vi 1217 
          uidirty.from = 0;
1218 
          uidirty.to = 0xff;
1219 
          uidirty.statusbar = 1;
1354 mateusz.vi 1220 
          break;
1221 
 
1222 
        case MENU_SAVEAS:
1223 
          saveflag = 1;
1224 
          /* FALLTHRU */
1225 
        case MENU_SAVE:
1226 
          if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
1227 
            ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
1228 
            if (*fname == 0) break;
1229 
            saveflag = savefile(db, fname);
1230 
          } else {
1231 
            saveflag = savefile(db, NULL);
1232 
          }
1233 
 
1395 mateusz.vi 1234 
          mdr_cout_cursor_hide();
1235 
 
1354 mateusz.vi 1236 
          if (saveflag == 0) {
1547 mateusz.vi 1237 
            ui_msg(2, 0, 0, SCHEME_MSG);
1354 mateusz.vi 1238 
            mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
1239 
          } else {
1547 mateusz.vi 1240 
            ui_msg(10, 0, 0, SCHEME_ERR);
1354 mateusz.vi 1241 
            mdr_bios_tickswait(36); /* 2s */
1242 
          }
1395 mateusz.vi 1243 
          mdr_cout_cursor_show();
1354 mateusz.vi 1244 
          break;
1245 
 
1355 mateusz.vi 1246 
        case MENU_CLOSE:
1247 
          if (ui_confirm_if_unsaved(db) == 0) {
1418 mateusz.vi 1248 
            loadfile(db, NULL);
1355 mateusz.vi 1249 
          }
1250 
          uidirty.from = 0;
1251 
          uidirty.to = 0xff;
1252 
          uidirty.statusbar = 1;
1253 
          break;
1254 
 
1354 mateusz.vi 1255 
        case MENU_CHGEOL:
1393 mateusz.vi 1256 
          db->modflag = 1;
1354 mateusz.vi 1257 
          db->lfonly ^= 1;
1258 
          break;
1259 
 
1260 
        case MENU_QUIT:
1355 mateusz.vi 1261 
          quitnow = 1;
1549 mateusz.vi 1262 
          {
1263 
            unsigned short curfile;
1264 
            for (curfile = 0; curfile < 10; curfile++) {
1265 
              if (dbarr[curfile].modflag == 0) continue; /* skip unmodified slots */
1355 mateusz.vi 1266 
              db = select_slot(dbarr, curfile);
1441 mateusz.vi 1267 
              if (ui_confirm_if_unsaved(db) != 0) {
1268 
                quitnow = 0;
1269 
                break;
1270 
              }
1355 mateusz.vi 1271 
            }
1272 
          }
1354 mateusz.vi 1273 
          break;
1274 
      }
1275 
 
1276 
      if (quitnow) break;
1277 
 
1289 mateusz.vi 1278 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 1279 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 1280 
      /* add a new line */
1328 mateusz.vi 1281 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1393 mateusz.vi 1282 
        db->modflag = 1;
1328 mateusz.vi 1283 
        db->cursor = db->cursor->prev; /* back to original line */
1427 mateusz.vi 1284 
        db->curline -= 1;
1289 mateusz.vi 1285 
        /* trim the line above */
1328 mateusz.vi 1286 
        db->cursor->len = off;
1289 mateusz.vi 1287 
        /* move cursor to the (new) line below */
1328 mateusz.vi 1288 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 1289 
        uidirty.to = 0xff;
1328 mateusz.vi 1290 
        cursor_down(db);
1291 
        cursor_home(db);
1289 mateusz.vi 1292 
      } else {
1293 
        /* ERROR: OUT OF MEMORY */
1294 
      }
1295 
 
1292 mateusz.vi 1296 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 1297 
      del(db);
1292 mateusz.vi 1298 
 
1302 mateusz.vi 1299 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 1300 
      bkspc(db);
1302 mateusz.vi 1301 
 
1308 mateusz.vi 1302 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 1303 
      char c = k;
1327 mateusz.vi 1304 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 1305 
 
1317 mateusz.vi 1306 
    } else if (k == 0x009) { /* TAB */
1412 mateusz.vi 1307 
      if (glob_tablessmode == 0) {
1308 
        insert_in_line(db, "        ", 8);
1309 
      } else {
1310 
        insert_in_line(db, "\t", 1);
1311 
      }
1317 mateusz.vi 1312 
 
1355 mateusz.vi 1313 
    } else if ((k >= 0x13b) && (k <= 0x144)) { /* F1..F10 */
1549 mateusz.vi 1314 
      db = select_slot(dbarr, k - 0x13b);
1309 mateusz.vi 1315 
 
1325 mateusz.vi 1316 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
1317 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
1318 
      for (;;) {
1319 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
1320 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 1321 
        cursor_right(db);
1325 mateusz.vi 1322 
      }
1323 
      /* now skip to next non-space or end of file */
1324 
      for (;;) {
1327 mateusz.vi 1325 
        cursor_right(db);
1325 mateusz.vi 1326 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
1328 
      }
1329 
 
1330 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 1331 
      cursor_left(db);
1325 mateusz.vi 1332 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
1333 
      for (;;) {
1334 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
1335 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 1336 
        cursor_left(db);
1325 mateusz.vi 1337 
      }
1338 
      /* now skip to next space or start of file */
1339 
      for (;;) {
1327 mateusz.vi 1340 
        cursor_left(db);
1325 mateusz.vi 1341 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 1342 
          cursor_right(db);
1325 mateusz.vi 1343 
          break;
1344 
        }
1345 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
1346 
      }
1347 
 
1410 mateusz.vi 1348 
    } else if ((k == 0x003) || (k == 0x018)) { /* CTRL+C or CTRL+X */
1349 
      /* free clipboard if anything in it */
1350 
      if (clipboard != NULL) line_free(clipboard);
1351 
 
1352 
      /* copy cursor line to clipboard */
1353 
      clipboard = line_calloc(db->cursor->len);
1354 
      if (clipboard == NULL) {
1547 mateusz.vi 1355 
        ui_msg(10, 0, 0, SCHEME_ERR); /* ERROR */
1410 mateusz.vi 1356 
        mdr_bios_tickswait(18); /* 1s */
1357 
      } else {
1427 mateusz.vi 1358 
        mdr_cout_char_rep(db->cursorposy, 0, ' ', ((SCHEME_TEXT >> 4) | (SCHEME_TEXT << 4)) & 0xff, screenlastcol);
1410 mateusz.vi 1359 
        uidirty.from = db->cursorposy;
1360 
        uidirty.to = db->cursorposy;
1361 
        if (db->cursor->len != 0) {
1568 mateusz.vi 1362 
          fmemmove(clipboard->payload, db->cursor->payload, db->cursor->len);
1410 mateusz.vi 1363 
          clipboard->len = db->cursor->len;
1364 
        }
1365 
        mdr_bios_tickswait(2); /* ca 100ms */
1366 
 
1367 
        /* if this is about cutting the line (CTRL+X) then delete cur line */
1368 
        if ((k == 0x018) && ((db->cursor->next != NULL) || (db->cursor->prev != NULL))) {
1369 
          if (db->cursor->next) db->cursor->next->prev = db->cursor->prev;
1370 
          if (db->cursor->prev) db->cursor->prev->next = db->cursor->next;
1371 
          clipboard->prev = db->cursor;
1372 
          if (db->cursor->next) {
1373 
            db->cursor = db->cursor->next;
1374 
          } else {
1375 
            cursor_up(db);
1376 
          }
1377 
          line_free(clipboard->prev);
1423 mateusz.vi 1378 
          db->totlines -= 1;
1552 mateusz.vi 1379 
          db->modflag = 1;
1410 mateusz.vi 1380 
          uidirty.from = 0;
1381 
          uidirty.to = 0xff;
1412 mateusz.vi 1382 
          recompute_curline(db);
1410 mateusz.vi 1383 
        }
1384 
      }
1385 
 
1420 mateusz.vi 1386 
    } else if ((k == 0x016) && (clipboard != NULL)) { /* CTRL+V */
1387 
      if (line_add(db, clipboard->payload, clipboard->len) != 0) {
1547 mateusz.vi 1388 
        ui_msg(10, 0, 0, SCHEME_ERR); /* ERROR */
1420 mateusz.vi 1389 
        mdr_bios_tickswait(18); /* 1s */
1390 
      } else {
1391 
        /* rewire the linked list so the new line is on top of the previous one */
1392 
        clipboard->prev = db->cursor->prev;
1393 
        /* remove prev node from list */
1394 
        db->cursor->prev = db->cursor->prev->prev;
1395 
        if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor;
1396 
        /* insert the node after cursor now */
1397 
        clipboard->prev->next = db->cursor->next;
1398 
        if (db->cursor->next != NULL) db->cursor->next->prev = clipboard->prev;
1399 
        clipboard->prev->prev = db->cursor;
1400 
        db->cursor->next = clipboard->prev;
1401 
        cursor_down(db);
1552 mateusz.vi 1402 
        db->modflag = 1;
1410 mateusz.vi 1403 
      }
1404 
      uidirty.from = 0;
1405 
      uidirty.to = 0xff;
1412 mateusz.vi 1406 
      recompute_curline(db);
1410 mateusz.vi 1407 
 
1333 mateusz.vi 1408 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 1409 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
1410 
      char buff[4];
1411 
      const char *HEX = "0123456789ABCDEF";
1412 
      buff[0] = HEX[(k >> 8) & 15];
1413 
      buff[1] = HEX[(k >> 4) & 15];
1414 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 1415 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
1416 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1410 mateusz.vi 1417 
      mdr_dos_getkey2();
1275 mateusz.vi 1418 
      break;
1333 mateusz.vi 1419 
#endif
1275 mateusz.vi 1420 
    }
1421 
  }
1422 
 
1423 
  mdr_cout_close();
1424 
 
1414 mateusz.vi 1425 
  /* restore the DOS BREAK flag if it was originally set */
1426 
  if (original_breakflag != 0) mdr_dos_ctrlc_enable();
1427 
 
1320 mateusz.vi 1428 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 1429 
 
1347 mateusz.vi 1430 
  return;
1275 mateusz.vi 1431 
}