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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 
 
1575 mateusz.vi 149 
 
150 
static size_t strlen(const char *s) {
151 
  const char *ptr = s;
152 
  while (*ptr != 0) ptr++;
153 
  return(ptr - s);
154 
}
155 
 
156 
 
157 
static void bzero(void *ptr, size_t len) {
158 
  char *p = ptr;
159 
  while (len > 0) {
160 
    *p = 0;
161 
    p++;
162 
    len--;
163 
  }
164 
}
165 
 
166 
 
167 
/* TODO this function does not handle overlapping strings well! */
168 
static void fmemmove(void far *dst, const void far *src, size_t len) {
169 
  while (len-- > 0) {
170 
    *(char far *)dst = *(char far *)src;
171 
    dst = (char far *)dst + 1;
172 
    src = (char far *)src + 1;
173 
  }
174 
}
175 
 
176 
 
1339 mateusz.vi 177 
static struct line far *line_calloc(unsigned short siz) {
1342 mateusz.vi 178 
  struct line far *res;
1556 mateusz.vi 179 
  unsigned short seg;
1461 mateusz.vi 180 
 
1572 mateusz.vi 181 
  seg = dosalloc((sizeof(struct line) + siz + 15) / 16);
1556 mateusz.vi 182 
  if (seg == 0) return(NULL);
1342 mateusz.vi 183 
  res = MK_FP(seg, 0);
1461 mateusz.vi 184 
  res->len = 0;
185 
  res->next = NULL;
186 
  res->prev = NULL;
187 
 
188 
  return(res);
1339 mateusz.vi 189 
}
190 
 
191 
 
192 
static void line_free(struct line far *ptr) {
1572 mateusz.vi 193 
  dosfree(FP_SEG(ptr));
1339 mateusz.vi 194 
}
195 
 
196 
 
1550 mateusz.vi 197 
static int curline_resize(struct file *db, unsigned short newsiz) {
1339 mateusz.vi 198 
  struct line far *newptr;
199 
 
1341 mateusz.vi 200 
  /* try resizing the block (much faster) */
1557 mateusz.vi 201 
  if (mdr_dos_resizeblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor)) == 0) return(0);
1339 mateusz.vi 202 
 
203 
  /* create a new block and copy data over */
204 
  newptr = line_calloc(newsiz);
1340 mateusz.vi 205 
  if (newptr == NULL) return(-1);
1568 mateusz.vi 206 
  fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
1340 mateusz.vi 207 
 
208 
  /* rewire the linked list */
209 
  db->cursor = newptr;
210 
  if (newptr->next) newptr->next->prev = newptr;
211 
  if (newptr->prev) newptr->prev->next = newptr;
212 
 
213 
  return(0);
1339 mateusz.vi 214 
}
215 
 
216 
 
1328 mateusz.vi 217 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 218 
 * returns non-zero on error */
1328 mateusz.vi 219 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 220 
  struct line far *l;
1275 mateusz.vi 221 
 
1339 mateusz.vi 222 
  l = line_calloc(slen);
1287 mateusz.vi 223 
  if (l == NULL) return(-1);
224 
 
1275 mateusz.vi 225 
  l->prev = db->cursor;
226 
  if (db->cursor) {
227 
    l->next = db->cursor->next;
228 
    db->cursor->next = l;
229 
    l->next->prev = l;
230 
  }
231 
  db->cursor = l;
1342 mateusz.vi 232 
  if (slen > 0) {
1568 mateusz.vi 233 
    fmemmove(l->payload, line, slen);
1342 mateusz.vi 234 
    l->len = slen;
235 
  }
1287 mateusz.vi 236 
 
1328 mateusz.vi 237 
  db->totlines += 1;
238 
  db->curline += 1;
239 
 
1287 mateusz.vi 240 
  return(0);
1275 mateusz.vi 241 
}
242 
 
243 
 
1348 mateusz.vi 244 
static void ui_getstring(const char *query, char *s, unsigned short maxlen) {
245 
  unsigned short len = 0;
1544 mateusz.vi 246 
  unsigned char x;
1332 mateusz.vi 247 
  int k;
248 
 
249 
  if (maxlen == 0) return;
250 
  maxlen--; /* make room for the nul terminator */
251 
 
252 
  /* print query string */
1544 mateusz.vi 253 
  x = mdr_cout_str(screenlastrow, 0, query, SCHEME_STBAR3, 40);
254 
  mdr_cout_char_rep(screenlastrow, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 255 
 
256 
  for (;;) {
1544 mateusz.vi 257 
    mdr_cout_locate(screenlastrow, x + len);
1410 mateusz.vi 258 
    k = mdr_dos_getkey2();
1332 mateusz.vi 259 
 
1345 mateusz.vi 260 
    switch (k) {
261 
      case 0x1b: /* ESC */
262 
        s[0] = 0;
263 
        return;
264 
      case '\r':
265 
        s[len] = 0;
266 
        return;
267 
      case 0x08: /* BKSPC */
268 
        if (len > 0) {
269 
          len--;
1544 mateusz.vi 270 
          mdr_cout_char(screenlastrow, x + len, ' ', SCHEME_STBAR3);
1345 mateusz.vi 271 
        }
272 
        break;
273 
      default:
274 
        if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
1544 mateusz.vi 275 
          mdr_cout_char(screenlastrow, x + len, k, SCHEME_STBAR3);
1345 mateusz.vi 276 
          s[len++] = k;
277 
        }
1332 mateusz.vi 278 
    }
1345 mateusz.vi 279 
  }
1332 mateusz.vi 280 
 
281 
}
282 
 
283 
 
1324 mateusz.vi 284 
/* append a nul-terminated string to line at cursor position */
1550 mateusz.vi 285 
static int line_append(struct file *f, const char *buf, unsigned short len) {
1427 mateusz.vi 286 
  if (sizeof(struct line) + f->cursor->len + len < len) goto ERR; /* overflow check */
287 
  if (curline_resize(f, f->cursor->len + len) != 0) goto ERR;
288 
 
1568 mateusz.vi 289 
  fmemmove(f->cursor->payload + f->cursor->len, buf, len);
1324 mateusz.vi 290 
  f->cursor->len += len;
291 
 
292 
  return(0);
1427 mateusz.vi 293 
  ERR:
294 
  return(-1);
1324 mateusz.vi 295 
}
296 
 
297 
 
1315 mateusz.vi 298 
static void db_rewind(struct file *db) {
1275 mateusz.vi 299 
  if (db->cursor == NULL) return;
300 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 301 
  db->curline = 0;
1275 mateusz.vi 302 
}
303 
 
304 
 
1541 mateusz.vi 305 
/* saves db file, resets db->modflag on success and overwrites the filename
306 
 * field if saveas is not NULL */
307 
static int savefile(struct file *db, const char *saveas) {
1539 mateusz.vi 308 
  int fd = 0;
309 
  const struct line far *l;
1556 mateusz.vi 310 
  unsigned short bytes;
1539 mateusz.vi 311 
  unsigned char eollen = 2;
312 
  const unsigned char *eolbuf = "\r\n";
313 
  int errflag = 0;
314 
 
315 
  /* if filename not overloaded then use the fname in db */
316 
  if (saveas == NULL) saveas = db->fname;
317 
 
318 
  _asm {
319 
    push ax
320 
    push cx
321 
    push dx
322 
 
323 
    mov ah, 0x3C    /* create or truncate file */
324 
    xor cx, cx      /* file attributes */
325 
    mov dx, saveas  /* works only in SMALL/TINY mode */
326 
    int 0x21
327 
    jnc DONE
328 
    mov errflag, ax
329 
    DONE:
330 
    mov fd, ax
331 
 
332 
    pop dx
333 
    pop cx
334 
    pop ax
335 
  }
336 
 
337 
  if (errflag != 0) return(-1);
338 
 
339 
  l = db->cursor;
340 
  while (l->prev) l = l->prev;
341 
 
342 
  /* preset line terminators */
343 
  if (db->lfonly) {
344 
    eolbuf++;
345 
    eollen--;
346 
  }
347 
 
348 
  while (l) {
349 
    /* do not write the last empty line, it is only useful for edition */
350 
    if (l->len != 0) {
1556 mateusz.vi 351 
      errflag |= mdr_dos_write(fd, l->payload, l->len, &bytes);
1539 mateusz.vi 352 
    } else if (l->next == NULL) {
353 
      break;
354 
    }
1556 mateusz.vi 355 
    errflag |= mdr_dos_write(fd, eolbuf, eollen, &bytes);
1539 mateusz.vi 356 
    l = l->next;
357 
  }
358 
 
1573 mateusz.vi 359 
  errflag |= dosfclose(fd);
1539 mateusz.vi 360 
 
1541 mateusz.vi 361 
  /* did it all work? */
362 
  if (errflag == 0) {
363 
    db->modflag = 0;
364 
    if (saveas != db->fname) mdr_dos_truename(db->fname, saveas);
365 
  }
366 
 
1539 mateusz.vi 367 
  return(errflag);
368 
}
369 
 
370 
 
1549 mateusz.vi 371 
static void ui_statusbar(const struct file *db) {
1356 mateusz.vi 372 
  const char *s = svarlang_strid(0); /* ESC=MENU */
1348 mateusz.vi 373 
  unsigned short helpcol = screenw - strlen(s);
1440 mateusz.vi 374 
  unsigned short col;
1275 mateusz.vi 375 
 
1425 mateusz.vi 376 
  /* slot number (guaranteed to be 0-9) */
1355 mateusz.vi 377 
  {
378 
    char slot[4] = "#00";
1549 mateusz.vi 379 
    if (db->slotid == 9) {
1425 mateusz.vi 380 
      slot[1] = '1';
381 
    } else {
1549 mateusz.vi 382 
      slot[2] += db->slotid + 1;
1425 mateusz.vi 383 
    }
1427 mateusz.vi 384 
    mdr_cout_str(screenlastrow, 0, slot, SCHEME_STBAR2, 3);
1355 mateusz.vi 385 
  }
1313 mateusz.vi 386 
 
1355 mateusz.vi 387 
  /* fill rest of status bar with background */
1427 mateusz.vi 388 
  mdr_cout_char_rep(screenlastrow, 3, ' ', SCHEME_STBAR1, helpcol - 3);
1355 mateusz.vi 389 
 
1313 mateusz.vi 390 
  /* eol type */
1330 mateusz.vi 391 
  {
392 
    const char *eoltype = "CRLF";
1353 mateusz.vi 393 
    if (db->lfonly) eoltype += 2;
1440 mateusz.vi 394 
    mdr_cout_str(screenlastrow, helpcol - 5, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 395 
  }
1313 mateusz.vi 396 
 
1438 mateusz.vi 397 
  /* line numbers */
1436 mateusz.vi 398 
  {
1438 mateusz.vi 399 
    unsigned short x;
400 
    unsigned char count = 0;
1440 mateusz.vi 401 
    col = helpcol - 7;
1438 mateusz.vi 402 
 
1439 mateusz.vi 403 
    x = db->totlines;
1438 mateusz.vi 404 
    AGAIN:
1436 mateusz.vi 405 
    do {
1439 mateusz.vi 406 
      mdr_cout_char(screenlastrow, col--, '0' + (x % 10), SCHEME_STBAR1);
1436 mateusz.vi 407 
      x /= 10;
408 
    } while (x);
1438 mateusz.vi 409 
    /* redo same exercise, but printing the current line now */
410 
    if (count == 0) {
411 
      count = 1;
1439 mateusz.vi 412 
      mdr_cout_char(screenlastrow, col--, '/', SCHEME_STBAR1);
1438 mateusz.vi 413 
      x = 1 + db->curline;
414 
      goto AGAIN;
415 
    }
1440 mateusz.vi 416 
  }
1438 mateusz.vi 417 
 
1440 mateusz.vi 418 
  /* filename and modflag */
419 
  {
420 
    const char *fn;
421 
    unsigned short x;
422 
    unsigned short maxfnlen = col - 6;
423 
    if (db->fname[0] == 0) {
424 
      fn = svarlang_str(0, 1); /* "UNTITLED" */
425 
    } else {
426 
      /* display filename up to maxfnlen chars */
427 
      fn = db->fname;
428 
      x = strlen(fn);
429 
      if (x > maxfnlen) fn += x - maxfnlen;
430 
    }
431 
    x = mdr_cout_str(screenlastrow, 4, fn, SCHEME_STBAR1, maxfnlen);
432 
    if (db->modflag) mdr_cout_char(screenlastrow, 5 + x, '!', SCHEME_STBAR2);
1436 mateusz.vi 433 
  }
434 
 
1427 mateusz.vi 435 
  mdr_cout_str(screenlastrow, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 436 
}
437 
 
438 
 
1547 mateusz.vi 439 
static void ui_msg(unsigned short msgid1, unsigned short msgid2, unsigned short msgid3, unsigned char attr) {
440 
  unsigned short x, y, maxmsglen, i;
441 
  unsigned short msgcount = 1;
442 
  const char *msg[3];
1331 mateusz.vi 443 
 
1547 mateusz.vi 444 
  msg[0] = svarlang_strid(msgid1);
445 
 
446 
  if (msgid2 != 0) {
447 
    msgcount = 2;
448 
    msg[1] = svarlang_strid(msgid2);
1331 mateusz.vi 449 
  }
1547 mateusz.vi 450 
  if (msgid3 != 0) {
451 
    msgcount = 3;
452 
    msg[2] = svarlang_strid(msgid3);
453 
  }
1331 mateusz.vi 454 
 
1547 mateusz.vi 455 
  /* find longest msg */
456 
  maxmsglen = 0;
457 
  for (i = 0; i < msgcount; i++) {
458 
    y = strlen(msg[i]);
459 
    if (y > maxmsglen) maxmsglen = y;
460 
  }
461 
 
1331 mateusz.vi 462 
  y = (screenh - 6) >> 1;
1547 mateusz.vi 463 
  x = (screenw - maxmsglen - 3) >> 1;
464 
  for (i = y+1+msgcount; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, maxmsglen + 2);
1331 mateusz.vi 465 
  x++;
1345 mateusz.vi 466 
 
1547 mateusz.vi 467 
  for (i = 0; i < msgcount; i++) {
468 
    mdr_cout_str(y+1+i, x, msg[i], attr, maxmsglen);
469 
  }
1312 mateusz.vi 470 
 
1327 mateusz.vi 471 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 472 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 473 
}
474 
 
475 
 
1539 mateusz.vi 476 
/* returns 0 if operation may proceed, non-zero to cancel */
1541 mateusz.vi 477 
static unsigned char ui_confirm_if_unsaved(struct file *db) {
1539 mateusz.vi 478 
  int k;
479 
 
1342 mateusz.vi 480 
  if (db->modflag == 0) return(0);
481 
 
1355 mateusz.vi 482 
  mdr_cout_cursor_hide();
483 
 
1539 mateusz.vi 484 
  /* if file has been modified then ask for confirmation:
485 
   * ENTER        : agree to data loss
486 
   * SPACE        : SAVE file before quit (only if valid filename present)
487 
   * anything else: ABORT */
1547 mateusz.vi 488 
  ui_msg(4, 5, (db->fname[0])?9:8, SCHEME_MSG);
1342 mateusz.vi 489 
 
1539 mateusz.vi 490 
  k = mdr_dos_getkey2();
1355 mateusz.vi 491 
  mdr_cout_cursor_show();
492 
 
1539 mateusz.vi 493 
  /* ENTER = agree to loose unsaved data */
494 
  if (k == '\r') return(0);
495 
 
496 
  /* SPACE = save file and continue */
497 
  if ((k == ' ') && (db->fname[0] != 0) && (savefile(db, NULL) == 0)) return(0);
498 
 
499 
  /* any other key = cancel operation */
500 
  return(1);
1342 mateusz.vi 501 
}
502 
 
503 
 
1327 mateusz.vi 504 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 505 
  unsigned char x;
1310 mateusz.vi 506 
  const struct line far *l;
1316 mateusz.vi 507 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 508 
 
1392 mateusz.vi 509 
  /* quit early if nothing to refresh */
510 
  if (uidirty.from == 0xff) return;
511 
 
1288 mateusz.vi 512 
#ifdef DBG_REFRESH
1282 mateusz.vi 513 
  static char m = 'a';
514 
  m++;
515 
  if (m > 'z') m = 'a';
1288 mateusz.vi 516 
#endif
1282 mateusz.vi 517 
 
1310 mateusz.vi 518 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 519 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 520 
 
1310 mateusz.vi 521 
  /* iterate over lines and redraw whatever needs to be redrawn */
522 
  for (; l != NULL; l = l->next, y++) {
523 
 
524 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 525 
    if (y < uidirty.from) continue;
526 
    if (y > uidirty.to) break;
1282 mateusz.vi 527 
 
1318 mateusz.vi 528 
    x = 0;
1275 mateusz.vi 529 
    if (db->xoffset < l->len) {
1318 mateusz.vi 530 
      unsigned char i, limit;
531 
      if (l->len - db->xoffset < screenw) {
532 
        limit = l->len;
533 
      } else {
1427 mateusz.vi 534 
        limit = db->xoffset + screenlastcol;
1318 mateusz.vi 535 
      }
1333 mateusz.vi 536 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 537 
    }
1282 mateusz.vi 538 
 
1318 mateusz.vi 539 
    /* write empty spaces until end of line */
1427 mateusz.vi 540 
    if (x < screenlastcol) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenlastcol - x);
1318 mateusz.vi 541 
 
1288 mateusz.vi 542 
#ifdef DBG_REFRESH
1333 mateusz.vi 543 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 544 
#endif
1282 mateusz.vi 545 
 
1275 mateusz.vi 546 
    if (y == screenh - 2) break;
547 
  }
1310 mateusz.vi 548 
 
1319 mateusz.vi 549 
  /* fill all lines below if empty (and they need to be redrawn) */
550 
  if (l == NULL) {
1427 mateusz.vi 551 
    while ((y < screenlastrow) && (y < uidirty.to)) {
552 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenlastcol);
1319 mateusz.vi 553 
    }
1318 mateusz.vi 554 
  }
1328 mateusz.vi 555 
 
556 
  /* scroll bar */
1427 mateusz.vi 557 
  for (y = 0; y < screenlastrow; y++) {
558 
    mdr_cout_char(y, screenlastcol, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 559 
  }
560 
 
561 
  /* scroll cursor */
562 
  if (db->totlines >= screenh) {
563 
    unsigned short topline = db->curline - db->cursorposy;
564 
    unsigned short col;
565 
    unsigned short totlines = db->totlines - screenh + 1;
566 
    if (db->totlines - screenh > screenh) {
1427 mateusz.vi 567 
      col = topline / (totlines / screenlastrow);
1328 mateusz.vi 568 
    } else {
1427 mateusz.vi 569 
      col = topline * screenlastrow / totlines;
1328 mateusz.vi 570 
    }
1427 mateusz.vi 571 
    if (col >= screenlastrow) col = screenh - 2;
572 
    mdr_cout_char(col, screenlastcol, ' ', SCHEME_SCROLL);
1328 mateusz.vi 573 
  }
1392 mateusz.vi 574 
 
575 
  /* clear out the dirty flag */
576 
  uidirty.from = 0xff;
1275 mateusz.vi 577 
}
578 
 
579 
 
1327 mateusz.vi 580 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 581 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 582 
 
583 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 584 
    db->cursorposx = 0;
1275 mateusz.vi 585 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 586 
    uidirty.from = 0;
587 
    uidirty.to = 0xff;
1275 mateusz.vi 588 
  } else {
1316 mateusz.vi 589 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 590 
  }
591 
}
592 
 
593 
 
1327 mateusz.vi 594 
static void cursor_up(struct file *db) {
1422 mateusz.vi 595 
  if (db->cursor->prev == NULL) return;
596 
 
597 
  db->curline -= 1;
598 
  db->cursor = db->cursor->prev;
599 
  if (db->cursorposy == 0) {
600 
    uidirty.from = 0;
601 
    uidirty.to = 0xff;
602 
  } else {
603 
    db->cursorposy -= 1;
1275 mateusz.vi 604 
  }
605 
}
606 
 
607 
 
1327 mateusz.vi 608 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 609 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 610 
  if (db->xoffset > db->cursor->len) {
611 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 612 
    uidirty.from = 0;
613 
    uidirty.to = 0xff;
1282 mateusz.vi 614 
  }
615 
 
1427 mateusz.vi 616 
  if (db->xoffset + screenlastcol <= db->cursor->len) {
1282 mateusz.vi 617 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 618 
    uidirty.from = 0;
619 
    uidirty.to = 0xff;
1282 mateusz.vi 620 
  }
1316 mateusz.vi 621 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 622 
}
623 
 
624 
 
1327 mateusz.vi 625 
static void cursor_down(struct file *db) {
1422 mateusz.vi 626 
  if (db->cursor->next == NULL) return;
627 
 
628 
  db->curline += 1;
629 
  db->cursor = db->cursor->next;
630 
  if (db->cursorposy < screenh - 2) {
631 
    db->cursorposy += 1;
632 
  } else {
633 
    uidirty.from = 0;
634 
    uidirty.to = 0xff;
1276 mateusz.vi 635 
  }
636 
}
637 
 
638 
 
1327 mateusz.vi 639 
static void cursor_left(struct file *db) {
1316 mateusz.vi 640 
  if (db->cursorposx > 0) {
641 
    db->cursorposx -= 1;
1302 mateusz.vi 642 
  } else if (db->xoffset > 0) {
643 
    db->xoffset -= 1;
1327 mateusz.vi 644 
    uidirty.from = 0;
645 
    uidirty.to = 0xff;
1302 mateusz.vi 646 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 647 
    cursor_up(db);
648 
    cursor_eol(db);
1302 mateusz.vi 649 
  }
650 
}
651 
 
652 
 
1327 mateusz.vi 653 
static void cursor_home(struct file *db) {
1316 mateusz.vi 654 
  db->cursorposx = 0;
1282 mateusz.vi 655 
  if (db->xoffset != 0) {
656 
    db->xoffset = 0;
1327 mateusz.vi 657 
    uidirty.from = 0;
658 
    uidirty.to = 0xff;
1282 mateusz.vi 659 
  }
1276 mateusz.vi 660 
}
661 
 
662 
 
1327 mateusz.vi 663 
static void cursor_right(struct file *db) {
1316 mateusz.vi 664 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
665 
    if (db->cursorposx < screenw - 2) {
666 
      db->cursorposx += 1;
1308 mateusz.vi 667 
    } else {
668 
      db->xoffset += 1;
1327 mateusz.vi 669 
      uidirty.from = 0;
670 
      uidirty.to = 0xff;
1308 mateusz.vi 671 
    }
1357 mateusz.vi 672 
  } else if (db->cursor->next != NULL) { /* jump to start of next line */
1327 mateusz.vi 673 
    cursor_down(db);
674 
    cursor_home(db);
1308 mateusz.vi 675 
  }
676 
}
677 
 
678 
 
1327 mateusz.vi 679 
static void del(struct file *db) {
1316 mateusz.vi 680 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
1568 mateusz.vi 681 
    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 682 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 683 
    uidirty.from = db->cursorposy;
684 
    uidirty.to = db->cursorposy;
1393 mateusz.vi 685 
    db->modflag = 1;
1292 mateusz.vi 686 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
687 
    struct line far *nextline = db->cursor->next;
688 
    if (db->cursor->next->len > 0) {
1340 mateusz.vi 689 
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
1568 mateusz.vi 690 
        fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 691 
        db->cursor->len += db->cursor->next->len;
692 
      }
693 
    }
1340 mateusz.vi 694 
 
1292 mateusz.vi 695 
    db->cursor->next = db->cursor->next->next;
696 
    db->cursor->next->prev = db->cursor;
1340 mateusz.vi 697 
 
1339 mateusz.vi 698 
    line_free(nextline);
1327 mateusz.vi 699 
    uidirty.from = db->cursorposy;
700 
    uidirty.to = 0xff;
1328 mateusz.vi 701 
    db->totlines -= 1;
1393 mateusz.vi 702 
    db->modflag = 1;
1292 mateusz.vi 703 
  }
704 
}
705 
 
706 
 
1327 mateusz.vi 707 
static void bkspc(struct file *db) {
1302 mateusz.vi 708 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1421 mateusz.vi 709 
  if ((db->cursorposx + db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 710 
 
1327 mateusz.vi 711 
  cursor_left(db);
712 
  del(db);
1302 mateusz.vi 713 
}
714 
 
715 
 
1450 mateusz.vi 716 
#define LOADFILE_FILENOTFOUND 2
717 
 
1346 mateusz.vi 718 
/* returns 0 on success, 1 on file not found, 2 on other error */
1449 mateusz.vi 719 
static unsigned char loadfile(struct file *db, const char *fname) {
1324 mateusz.vi 720 
  char *buffptr;
1556 mateusz.vi 721 
  unsigned short len, llen;
722 
  unsigned short fd;
1324 mateusz.vi 723 
  unsigned char eolfound;
1449 mateusz.vi 724 
  unsigned char err = 0;
1287 mateusz.vi 725 
 
1355 mateusz.vi 726 
  /* free the entire linked list of lines */
727 
  db_rewind(db);
728 
  while (db->cursor) {
729 
    struct line far *victim;
730 
    victim = db->cursor;
731 
    db->cursor = db->cursor->next;
732 
    line_free(victim);
733 
  }
1321 mateusz.vi 734 
 
1551 mateusz.vi 735 
  /* zero out the struct (take care to preserve the id of the slot, though) */
736 
  {
737 
    unsigned char slotid = db->slotid;
738 
    bzero(db, sizeof(struct file));
739 
    db->slotid = slotid;
740 
  }
1355 mateusz.vi 741 
 
1448 mateusz.vi 742 
  /* start by adding an empty line */
743 
  if (line_add(db, NULL, 0) != 0) return(2);
744 
 
1418 mateusz.vi 745 
  if (fname == NULL) goto SKIPLOADING;
1321 mateusz.vi 746 
 
1543 mateusz.vi 747 
  /* make the filename canonical (DOS 3+ only, on earlier versions it just copies the filename) */
748 
  mdr_dos_truename(db->fname, fname);
1355 mateusz.vi 749 
 
1565 mateusz.vi 750 
  /* fopen file */
751 
  fd = 0;
752 
  _asm {
753 
    push cx
754 
    push dx
755 
 
756 
    mov ax, 0x3d00
757 
    mov dx, fname   // works only in SMALL memory model!
758 
    xor cl, cl
759 
    int 0x21
760 
    mov fd, ax
761 
    jnc done
762 
    mov err, al
763 
    done:
764 
 
765 
    pop dx
766 
    pop cx
767 
  }
768 
 
1450 mateusz.vi 769 
  if (err != 0) goto SKIPLOADING;
1287 mateusz.vi 770 
 
1313 mateusz.vi 771 
  db->lfonly = 1;
772 
 
1324 mateusz.vi 773 
  for (eolfound = 0;;) {
774 
    unsigned short consumedbytes;
775 
 
1574 mateusz.vi 776 
    if ((dosfread(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
1324 mateusz.vi 777 
    buffptr = buff;
778 
 
779 
    FINDLINE:
780 
 
1361 mateusz.vi 781 
    /* look for nearest \n (also expand tabs) */
1324 mateusz.vi 782 
    for (consumedbytes = 0;; consumedbytes++) {
1361 mateusz.vi 783 
 
784 
      if (buffptr[consumedbytes] == '\t') {
785 
        llen = consumedbytes;
786 
        break;
787 
      }
788 
 
1324 mateusz.vi 789 
      if (consumedbytes == len) {
790 
        llen = consumedbytes;
791 
        break;
1323 mateusz.vi 792 
      }
1324 mateusz.vi 793 
      if (buffptr[consumedbytes] == '\r') {
794 
        llen = consumedbytes;
795 
        consumedbytes++;
796 
        db->lfonly = 0;
1320 mateusz.vi 797 
        break;
798 
      }
1324 mateusz.vi 799 
      if (buffptr[consumedbytes] == '\n') {
800 
        eolfound = 1;
801 
        llen = consumedbytes;
802 
        consumedbytes++;
803 
        break;
804 
      }
1287 mateusz.vi 805 
    }
1324 mateusz.vi 806 
 
807 
    /* consumedbytes is the amount of bytes processed from buffptr,
808 
     * llen is the length of line's payload (without its line terminator) */
809 
 
810 
    /* append content, if line is non-empty */
811 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1339 mateusz.vi 812 
      goto IOERR;
1287 mateusz.vi 813 
    }
814 
 
1419 mateusz.vi 815 
    /* allocate the next line if current line ended */
1324 mateusz.vi 816 
    if (eolfound) {
1328 mateusz.vi 817 
      if (line_add(db, NULL, 0) != 0) {
1339 mateusz.vi 818 
        goto IOERR;
1324 mateusz.vi 819 
      }
820 
      eolfound = 0;
821 
    }
1287 mateusz.vi 822 
 
1361 mateusz.vi 823 
    /* append 8 spaces if tab char found */
1412 mateusz.vi 824 
    if ((consumedbytes < len) && (buffptr[consumedbytes] == '\t') && (glob_tablessmode == 0)) {
1361 mateusz.vi 825 
      consumedbytes++;
826 
      if (line_append(db, "        ", 8) != 0) {
827 
        goto IOERR;
828 
      }
829 
    }
830 
 
1324 mateusz.vi 831 
    /* anything left? process the buffer leftover again */
832 
    if (consumedbytes < len) {
833 
      len -= consumedbytes;
834 
      buffptr += consumedbytes;
835 
      goto FINDLINE;
836 
    }
837 
 
838 
  }
839 
 
1573 mateusz.vi 840 
  dosfclose(fd);
1287 mateusz.vi 841 
 
1321 mateusz.vi 842 
  SKIPLOADING:
843 
 
1448 mateusz.vi 844 
  /* rewind cursor to top of file because it has been used by line_add() */
1339 mateusz.vi 845 
  db_rewind(db);
1320 mateusz.vi 846 
 
1448 mateusz.vi 847 
  return(err);
1339 mateusz.vi 848 
 
849 
  IOERR:
1573 mateusz.vi 850 
  dosfclose(fd);
1450 mateusz.vi 851 
  return(1);
1287 mateusz.vi 852 
}
853 
 
854 
 
1356 mateusz.vi 855 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
856 
 * of argc and argv, saves some 330 bytes of binary size
857 
 * returns non-zero on error */
858 
static int parseargv(struct file *dbarr) {
859 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
860 
  unsigned short count = 0;
861 
  char *arg;
862 
  unsigned short lastarg = 0;
1449 mateusz.vi 863 
  unsigned char err;
1356 mateusz.vi 864 
 
865 
  while (!lastarg) {
866 
    /* jump to nearest arg */
867 
    while (*tail == ' ') {
868 
      *tail = 0;
869 
      tail++;
870 
    }
871 
 
872 
    if (*tail == '\r') {
873 
      *tail = 0;
874 
      break;
875 
    }
876 
 
877 
    arg = tail;
878 
 
879 
    /* jump to next delimiter */
880 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
881 
 
882 
    /* if \r then remember this is the last arg */
883 
    if (*tail == '\r') lastarg = 1;
884 
 
885 
    *tail = 0;
886 
    tail++;
887 
 
888 
    /* look at the arg now */
889 
    if (*arg == '/') {
1412 mateusz.vi 890 
      if (arg[1] == 't') { /* /t = do not expand tabs */
891 
        glob_tablessmode = 1;
892 
 
893 
      } else if (arg[1] == 'm') { /* /m = force mono mode */
894 
        glob_monomode = 1;
895 
 
896 
      } else {  /* help screen */
1419 mateusz.vi 897 
        mdr_coutraw_str(svarlang_str(1,3)); /* Sved, the SvarDOS editor */
1412 mateusz.vi 898 
        mdr_coutraw_str(" [");
1419 mateusz.vi 899 
        mdr_coutraw_str(svarlang_str(1,4)); /* ver */
1412 mateusz.vi 900 
        mdr_coutraw_puts(" " PVER "]");
901 
        mdr_coutraw_puts("Copyright (C) " PDATE " Mateusz Viste");
902 
        mdr_coutraw_crlf();
1433 mateusz.vi 903 
        mdr_coutraw_str("sved [/m] [/t] ");
1412 mateusz.vi 904 
        mdr_coutraw_puts(svarlang_str(1,1)); /* args syntax */
905 
        mdr_coutraw_crlf();
906 
        mdr_coutraw_puts(svarlang_str(1,10)); /* /m */
907 
        mdr_coutraw_puts(svarlang_str(1,11)); /* /t */
908 
        return(-1);
1387 mateusz.vi 909 
      }
1412 mateusz.vi 910 
      continue;
1356 mateusz.vi 911 
    }
912 
 
913 
    /* looks to be a filename */
914 
    if (count == 10) {
1420 mateusz.vi 915 
      mdr_coutraw_puts(svarlang_str(0,12)); /* too many files */
916 
      return(-1);
1356 mateusz.vi 917 
    }
918 
 
919 
    /* try loading it */
1387 mateusz.vi 920 
    mdr_coutraw_str(svarlang_str(1,2));
921 
    mdr_coutraw_char(' ');
1356 mateusz.vi 922 
    mdr_coutraw_puts(arg);
923 
    err = loadfile(&(dbarr[count]), arg);
924 
    if (err) {
1450 mateusz.vi 925 
      if (err == LOADFILE_FILENOTFOUND) { /* file not found */
1396 mateusz.vi 926 
        if ((count == 0) && (lastarg != 0)) { /* a 'file not found' is fine if only one file was given */
927 
          err = 0;
928 
        } else {
929 
          err = 11;
930 
        }
1356 mateusz.vi 931 
      } else { /* general error */
932 
        err = 10;
933 
      }
1396 mateusz.vi 934 
      if (err) {
935 
        mdr_coutraw_puts(svarlang_str(0,err));
936 
        return(-1);
937 
      }
1356 mateusz.vi 938 
    }
939 
    count++;
940 
  }
941 
 
942 
  return(0);
943 
}
944 
 
945 
 
1327 mateusz.vi 946 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1340 mateusz.vi 947 
  if (curline_resize(db, db->cursor->len + len) == 0) {
1317 mateusz.vi 948 
    unsigned short off = db->xoffset + db->cursorposx;
1393 mateusz.vi 949 
    db->modflag = 1;
1568 mateusz.vi 950 
    fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
1317 mateusz.vi 951 
    db->cursor->len += len;
1327 mateusz.vi 952 
    uidirty.from = db->cursorposy;
953 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 954 
    while (len--) {
955 
      db->cursor->payload[off++] = *databuf;
956 
      databuf++;
1327 mateusz.vi 957 
      cursor_right(db);
1317 mateusz.vi 958 
    }
959 
  }
960 
}
961 
 
962 
 
1343 mateusz.vi 963 
/* recompute db->curline by counting nodes in linked list */
964 
static void recompute_curline(struct file *db) {
965 
  const struct line far *l = db->cursor;
966 
 
967 
  db->curline = 0;
968 
  while (l->prev != NULL) {
969 
    db->curline += 1;
970 
    l = l->prev;
971 
  }
972 
}
973 
 
974 
 
1354 mateusz.vi 975 
enum MENU_ACTION {
1393 mateusz.vi 976 
  MENU_NONE   = 0,
977 
  MENU_OPEN   = 1,
978 
  MENU_SAVE   = 2,
979 
  MENU_SAVEAS = 3,
980 
  MENU_CLOSE  = 4,
981 
  MENU_CHGEOL = 5,
1418 mateusz.vi 982 
  MENU_QUIT   = 6
1354 mateusz.vi 983 
};
984 
 
985 
static enum MENU_ACTION ui_menu(void) {
986 
  unsigned short i, curchoice, attr, x, slen;
1393 mateusz.vi 987 
  unsigned short xorigin, yorigin;
1354 mateusz.vi 988 
 
989 
  /* find out the longest string */
990 
  slen = 0;
1355 mateusz.vi 991 
  for (i = MENU_OPEN; i <= MENU_QUIT; i++) {
1354 mateusz.vi 992 
    x = strlen(svarlang_str(8, i));
993 
    if (x > slen) slen = x;
994 
  }
995 
 
1393 mateusz.vi 996 
  /* calculate where to draw the menu on screen */
997 
  xorigin = (screenw - (slen + 5)) / 2;
1395 mateusz.vi 998 
  yorigin = (screenh - (MENU_QUIT - MENU_OPEN + 6)) / 2;
1393 mateusz.vi 999 
 
1395 mateusz.vi 1000 
  /* */
1001 
  uidirty.from = yorigin;
1002 
  uidirty.to = 0xff;
1003 
  uidirty.statusbar = 1;
1004 
 
1005 
  /* hide the cursor */
1006 
  mdr_cout_cursor_hide();
1007 
 
1355 mateusz.vi 1008 
  curchoice = MENU_OPEN;
1354 mateusz.vi 1009 
  for (;;) {
1010 
    /* render menu */
1393 mateusz.vi 1011 
    for (i = MENU_NONE; i <= MENU_QUIT + 1; i++) {
1012 
      mdr_cout_char_rep(yorigin + i, xorigin, ' ', SCHEME_MENU, slen+4);
1354 mateusz.vi 1013 
      if (i == curchoice) {
1014 
        attr = SCHEME_MENU_CUR;
1415 mateusz.vi 1015 
        mdr_cout_char_rep(yorigin + i, xorigin + 1, ' ', SCHEME_MENU_SEL, slen + 2);
1354 mateusz.vi 1016 
      } else {
1017 
        attr = SCHEME_MENU;
1018 
      }
1416 mateusz.vi 1019 
      mdr_cout_str(yorigin + i, xorigin + 2, svarlang_str(8, i), attr, slen);
1354 mateusz.vi 1020 
    }
1021 
    /* wait for key */
1410 mateusz.vi 1022 
    switch (mdr_dos_getkey2()) {
1354 mateusz.vi 1023 
      case 0x150: /* down */
1024 
        if (curchoice == MENU_QUIT) {
1355 mateusz.vi 1025 
          curchoice = MENU_OPEN;
1354 mateusz.vi 1026 
        } else {
1027 
          curchoice++;
1028 
        }
1029 
        break;
1030 
      case 0x148: /* up */
1355 mateusz.vi 1031 
        if (curchoice == MENU_OPEN) {
1354 mateusz.vi 1032 
          curchoice = MENU_QUIT;
1033 
        } else {
1034 
          curchoice--;
1035 
        }
1036 
        break;
1395 mateusz.vi 1037 
      default:
1038 
        curchoice = MENU_NONE;
1039 
        /* FALLTHRU */
1040 
      case '\r': /* ENTER */
1041 
        mdr_cout_cursor_show();
1042 
        return(curchoice);
1354 mateusz.vi 1043 
    }
1044 
  }
1045 
}
1046 
 
1047 
 
1549 mateusz.vi 1048 
static struct file *select_slot(struct file *dbarr, unsigned short curfile) {
1355 mateusz.vi 1049 
  uidirty.from = 0;
1050 
  uidirty.to = 0xff;
1051 
  uidirty.statusbar = 1;
1052 
 
1053 
  dbarr = &(dbarr[curfile]);
1549 mateusz.vi 1054 
 
1415 mateusz.vi 1055 
  /* force redraw now, because the main() routine might not if this is exit
1056 
   * time and we want to show the user which file has unsaved changes */
1549 mateusz.vi 1057 
  ui_statusbar(dbarr);
1355 mateusz.vi 1058 
  ui_refresh(dbarr);
1059 
  return(dbarr);
1060 
}
1061 
 
1062 
 
1347 mateusz.vi 1063 
/* main returns nothing, ie. sved always exits with a zero exit code
1064 
 * (this saves 20 bytes of executable footprint) */
1065 
void main(void) {
1355 mateusz.vi 1066 
  static struct file dbarr[10];
1067 
  struct file *db = dbarr; /* visible file is the first slot by default */
1548 mateusz.vi 1068 
  static struct line far *clipboard;
1538 mateusz.vi 1069 
  static unsigned char original_breakflag;
1275 mateusz.vi 1070 
 
1418 mateusz.vi 1071 
  { /* load NLS resource */
1364 mateusz.vi 1072 
    unsigned short i = 0;
1073 
    const char far *selfptr;
1548 mateusz.vi 1074 
    char lang[8];
1364 mateusz.vi 1075 
    selfptr = mdr_dos_selfexe();
1076 
    if (selfptr != NULL) {
1077 
      do {
1548 mateusz.vi 1078 
        buff[i] = selfptr[i];
1079 
      } while (buff[i++] != 0);
1080 
      svarlang_autoload_exepath(buff, mdr_dos_getenv(lang, "LANG", sizeof(lang)));
1364 mateusz.vi 1081 
    }
1307 mateusz.vi 1082 
  }
1282 mateusz.vi 1083 
 
1355 mateusz.vi 1084 
  /* preload all slots with empty files */
1549 mateusz.vi 1085 
  {
1086 
    unsigned short i;
1087 
    for (i = 0; i < 10; i++) {
1088 
      loadfile(&(dbarr[i]), NULL);
1089 
      dbarr[i].slotid = i;
1090 
    }
1355 mateusz.vi 1091 
  }
1092 
 
1356 mateusz.vi 1093 
  /* parse argv (and load files, if any passed on) */
1094 
  if (parseargv(dbarr) != 0) return;
1282 mateusz.vi 1095 
 
1412 mateusz.vi 1096 
  if ((mdr_cout_init(&screenw, &screenh) != 0) && (glob_monomode == 0)) {
1333 mateusz.vi 1097 
    /* load color scheme if mdr_cout_init returns a color flag */
1098 
    SCHEME_TEXT = 0x17;
1354 mateusz.vi 1099 
    SCHEME_MENU = 0x70;
1388 mateusz.vi 1100 
    SCHEME_MENU_CUR = 0x6f;
1101 
    SCHEME_MENU_SEL = 0x66;
1333 mateusz.vi 1102 
    SCHEME_STBAR1 = 0x70;
1103 
    SCHEME_STBAR2 = 0x78;
1392 mateusz.vi 1104 
    SCHEME_STBAR3 = 0x3f;
1333 mateusz.vi 1105 
    SCHEME_SCROLL = 0x70;
1388 mateusz.vi 1106 
    SCHEME_MSG = 0x6f;
1333 mateusz.vi 1107 
    SCHEME_ERR = 0x4f;
1108 
  }
1427 mateusz.vi 1109 
  screenlastrow = screenh - 1;
1110 
  screenlastcol = screenw - 1;
1275 mateusz.vi 1111 
 
1414 mateusz.vi 1112 
  /* instruct DOS to stop detecting CTRL+C because user needs it for
1113 
   * copy/paste operations. also remember the original status of the BREAK
1114 
   * flag so I can restore it as it was before quitting. */
1115 
  original_breakflag = mdr_dos_ctrlc_disable();
1410 mateusz.vi 1116 
 
1275 mateusz.vi 1117 
  for (;;) {
1118 
    int k;
1119 
 
1362 mateusz.vi 1120 
    /* add an extra empty line if cursor is on last line and this line is not empty */
1121 
    if ((db->cursor->next == NULL) && (db->cursor->len != 0)) {
1122 
      if (line_add(db, NULL, 0) == 0) {
1123 
        db->cursor = db->cursor->prev; /* line_add() changes the cursor pointer */
1437 mateusz.vi 1124 
        db->curline -= 1;
1362 mateusz.vi 1125 
      }
1126 
    }
1127 
 
1327 mateusz.vi 1128 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 1129 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 1130 
 
1392 mateusz.vi 1131 
    ui_refresh(db);
1132 
 
1436 mateusz.vi 1133 
    if ((uidirty.statusbar != 0) || (db->modflagprev != db->modflag) || (db->curline_prev != db->curline)) {
1549 mateusz.vi 1134 
      ui_statusbar(db);
1342 mateusz.vi 1135 
      uidirty.statusbar = 0;
1355 mateusz.vi 1136 
      db->modflagprev = db->modflag;
1436 mateusz.vi 1137 
      db->curline_prev = db->curline;
1342 mateusz.vi 1138 
    }
1328 mateusz.vi 1139 
#ifdef DBG_LINENUM
1140 
      {
1141 
        char ddd[10];
1142 
        db->curline += 1;
1143 
        ddd[0] = '0' + db->curline / 100;
1144 
        ddd[1] = '0' + (db->curline % 100) / 10;
1145 
        ddd[2] = '0' + (db->curline % 10);
1146 
        db->curline -= 1;
1147 
        ddd[3] = '/';
1148 
        ddd[4] = '0' + db->totlines / 100;
1149 
        ddd[5] = '0' + (db->totlines % 100) / 10;
1150 
        ddd[6] = '0' + (db->totlines % 10);
1151 
        ddd[7] = 0;
1333 mateusz.vi 1152 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 1153 
      }
1154 
#endif
1275 mateusz.vi 1155 
 
1410 mateusz.vi 1156 
    k = mdr_dos_getkey2();
1282 mateusz.vi 1157 
 
1275 mateusz.vi 1158 
    if (k == 0x150) { /* down */
1327 mateusz.vi 1159 
      cursor_down(db);
1275 mateusz.vi 1160 
 
1161 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 1162 
      cursor_up(db);
1275 mateusz.vi 1163 
 
1164 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 1165 
      cursor_right(db);
1275 mateusz.vi 1166 
 
1167 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 1168 
      cursor_left(db);
1275 mateusz.vi 1169 
 
1282 mateusz.vi 1170 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 1171 
      unsigned char dist = db->cursorposy + screenh - 1;
1172 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
1173 
        db->cursor = db->cursor->prev;
1174 
        dist--;
1175 
      }
1176 
      if (dist != 0) {
1177 
        db->cursorposy = 0;
1178 
        db->cursorposx = 0;
1179 
      } else {
1180 
        dist = db->cursorposy;
1181 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
1182 
      }
1183 
      uidirty.from = 0;
1184 
      uidirty.to = 0xff;
1343 mateusz.vi 1185 
      recompute_curline(db);
1282 mateusz.vi 1186 
 
1187 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 1188 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
1189 
      while ((dist != 0) && (db->cursor->next != NULL)) {
1190 
        db->cursor = db->cursor->next;
1191 
        dist--;
1192 
      }
1193 
      if (dist != 0) {
1194 
        db->cursorposy = screenh - 2;
1195 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
1196 
        db->cursorposx = 0;
1197 
      } else {
1198 
        dist = screenh - 2 - db->cursorposy;
1199 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
1200 
      }
1201 
      uidirty.from = 0;
1202 
      uidirty.to = 0xff;
1343 mateusz.vi 1203 
      recompute_curline(db);
1282 mateusz.vi 1204 
 
1205 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 1206 
       cursor_home(db);
1282 mateusz.vi 1207 
 
1208 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 1209 
       cursor_eol(db);
1282 mateusz.vi 1210 
 
1275 mateusz.vi 1211 
    } else if (k == 0x1B) { /* ESC */
1354 mateusz.vi 1212 
      int quitnow = 0;
1394 mateusz.vi 1213 
      char fname[64];
1354 mateusz.vi 1214 
      int saveflag = 0;
1393 mateusz.vi 1215 
      enum MENU_ACTION ui_action;
1275 mateusz.vi 1216 
 
1392 mateusz.vi 1217 
      /* collect the exact menu action and clear the screen */
1218 
      ui_action = ui_menu();
1219 
      ui_refresh(db);
1354 mateusz.vi 1220 
 
1392 mateusz.vi 1221 
      switch (ui_action) {
1222 
 
1354 mateusz.vi 1223 
        case MENU_NONE:
1224 
          break;
1225 
 
1226 
        case MENU_OPEN:
1227 
          /* display a warning if unsaved changes are pending */
1547 mateusz.vi 1228 
          if (db->modflag != 0) ui_msg(4, 8, 0, SCHEME_MSG);
1354 mateusz.vi 1229 
 
1230 
          /* ask for filename */
1231 
          ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
1232 
          if (fname[0] != 0) {
1449 mateusz.vi 1233 
            unsigned char err;
1354 mateusz.vi 1234 
            err = loadfile(db, fname);
1235 
            if (err != 0) {
1450 mateusz.vi 1236 
              if (err == LOADFILE_FILENOTFOUND) {
1547 mateusz.vi 1237 
                ui_msg(11, 0, 0, SCHEME_ERR); /* file not found */
1354 mateusz.vi 1238 
              } else {
1547 mateusz.vi 1239 
                ui_msg(10, 0, 0, SCHEME_ERR);  /* ERROR */
1354 mateusz.vi 1240 
              }
1241 
              mdr_bios_tickswait(44); /* 3s */
1418 mateusz.vi 1242 
              loadfile(db, NULL);
1354 mateusz.vi 1243 
            }
1244 
          }
1393 mateusz.vi 1245 
          uidirty.from = 0;
1246 
          uidirty.to = 0xff;
1247 
          uidirty.statusbar = 1;
1354 mateusz.vi 1248 
          break;
1249 
 
1250 
        case MENU_SAVEAS:
1251 
          saveflag = 1;
1252 
          /* FALLTHRU */
1253 
        case MENU_SAVE:
1254 
          if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
1255 
            ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
1256 
            if (*fname == 0) break;
1257 
            saveflag = savefile(db, fname);
1258 
          } else {
1259 
            saveflag = savefile(db, NULL);
1260 
          }
1261 
 
1395 mateusz.vi 1262 
          mdr_cout_cursor_hide();
1263 
 
1354 mateusz.vi 1264 
          if (saveflag == 0) {
1547 mateusz.vi 1265 
            ui_msg(2, 0, 0, SCHEME_MSG);
1354 mateusz.vi 1266 
            mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
1267 
          } else {
1547 mateusz.vi 1268 
            ui_msg(10, 0, 0, SCHEME_ERR);
1354 mateusz.vi 1269 
            mdr_bios_tickswait(36); /* 2s */
1270 
          }
1395 mateusz.vi 1271 
          mdr_cout_cursor_show();
1354 mateusz.vi 1272 
          break;
1273 
 
1355 mateusz.vi 1274 
        case MENU_CLOSE:
1275 
          if (ui_confirm_if_unsaved(db) == 0) {
1418 mateusz.vi 1276 
            loadfile(db, NULL);
1355 mateusz.vi 1277 
          }
1278 
          uidirty.from = 0;
1279 
          uidirty.to = 0xff;
1280 
          uidirty.statusbar = 1;
1281 
          break;
1282 
 
1354 mateusz.vi 1283 
        case MENU_CHGEOL:
1393 mateusz.vi 1284 
          db->modflag = 1;
1354 mateusz.vi 1285 
          db->lfonly ^= 1;
1286 
          break;
1287 
 
1288 
        case MENU_QUIT:
1355 mateusz.vi 1289 
          quitnow = 1;
1549 mateusz.vi 1290 
          {
1291 
            unsigned short curfile;
1292 
            for (curfile = 0; curfile < 10; curfile++) {
1293 
              if (dbarr[curfile].modflag == 0) continue; /* skip unmodified slots */
1355 mateusz.vi 1294 
              db = select_slot(dbarr, curfile);
1441 mateusz.vi 1295 
              if (ui_confirm_if_unsaved(db) != 0) {
1296 
                quitnow = 0;
1297 
                break;
1298 
              }
1355 mateusz.vi 1299 
            }
1300 
          }
1354 mateusz.vi 1301 
          break;
1302 
      }
1303 
 
1304 
      if (quitnow) break;
1305 
 
1289 mateusz.vi 1306 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 1307 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 1308 
      /* add a new line */
1328 mateusz.vi 1309 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1393 mateusz.vi 1310 
        db->modflag = 1;
1328 mateusz.vi 1311 
        db->cursor = db->cursor->prev; /* back to original line */
1427 mateusz.vi 1312 
        db->curline -= 1;
1289 mateusz.vi 1313 
        /* trim the line above */
1328 mateusz.vi 1314 
        db->cursor->len = off;
1289 mateusz.vi 1315 
        /* move cursor to the (new) line below */
1328 mateusz.vi 1316 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 1317 
        uidirty.to = 0xff;
1328 mateusz.vi 1318 
        cursor_down(db);
1319 
        cursor_home(db);
1289 mateusz.vi 1320 
      } else {
1321 
        /* ERROR: OUT OF MEMORY */
1322 
      }
1323 
 
1292 mateusz.vi 1324 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 1325 
      del(db);
1292 mateusz.vi 1326 
 
1302 mateusz.vi 1327 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 1328 
      bkspc(db);
1302 mateusz.vi 1329 
 
1308 mateusz.vi 1330 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 1331 
      char c = k;
1327 mateusz.vi 1332 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 1333 
 
1317 mateusz.vi 1334 
    } else if (k == 0x009) { /* TAB */
1412 mateusz.vi 1335 
      if (glob_tablessmode == 0) {
1336 
        insert_in_line(db, "        ", 8);
1337 
      } else {
1338 
        insert_in_line(db, "\t", 1);
1339 
      }
1317 mateusz.vi 1340 
 
1355 mateusz.vi 1341 
    } else if ((k >= 0x13b) && (k <= 0x144)) { /* F1..F10 */
1549 mateusz.vi 1342 
      db = select_slot(dbarr, k - 0x13b);
1309 mateusz.vi 1343 
 
1325 mateusz.vi 1344 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
1345 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
1346 
      for (;;) {
1347 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
1348 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 1349 
        cursor_right(db);
1325 mateusz.vi 1350 
      }
1351 
      /* now skip to next non-space or end of file */
1352 
      for (;;) {
1327 mateusz.vi 1353 
        cursor_right(db);
1325 mateusz.vi 1354 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1355 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
1356 
      }
1357 
 
1358 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 1359 
      cursor_left(db);
1325 mateusz.vi 1360 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
1361 
      for (;;) {
1362 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
1363 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 1364 
        cursor_left(db);
1325 mateusz.vi 1365 
      }
1366 
      /* now skip to next space or start of file */
1367 
      for (;;) {
1327 mateusz.vi 1368 
        cursor_left(db);
1325 mateusz.vi 1369 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 1370 
          cursor_right(db);
1325 mateusz.vi 1371 
          break;
1372 
        }
1373 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
1374 
      }
1375 
 
1410 mateusz.vi 1376 
    } else if ((k == 0x003) || (k == 0x018)) { /* CTRL+C or CTRL+X */
1377 
      /* free clipboard if anything in it */
1378 
      if (clipboard != NULL) line_free(clipboard);
1379 
 
1380 
      /* copy cursor line to clipboard */
1381 
      clipboard = line_calloc(db->cursor->len);
1382 
      if (clipboard == NULL) {
1547 mateusz.vi 1383 
        ui_msg(10, 0, 0, SCHEME_ERR); /* ERROR */
1410 mateusz.vi 1384 
        mdr_bios_tickswait(18); /* 1s */
1385 
      } else {
1427 mateusz.vi 1386 
        mdr_cout_char_rep(db->cursorposy, 0, ' ', ((SCHEME_TEXT >> 4) | (SCHEME_TEXT << 4)) & 0xff, screenlastcol);
1410 mateusz.vi 1387 
        uidirty.from = db->cursorposy;
1388 
        uidirty.to = db->cursorposy;
1389 
        if (db->cursor->len != 0) {
1568 mateusz.vi 1390 
          fmemmove(clipboard->payload, db->cursor->payload, db->cursor->len);
1410 mateusz.vi 1391 
          clipboard->len = db->cursor->len;
1392 
        }
1393 
        mdr_bios_tickswait(2); /* ca 100ms */
1394 
 
1395 
        /* if this is about cutting the line (CTRL+X) then delete cur line */
1396 
        if ((k == 0x018) && ((db->cursor->next != NULL) || (db->cursor->prev != NULL))) {
1397 
          if (db->cursor->next) db->cursor->next->prev = db->cursor->prev;
1398 
          if (db->cursor->prev) db->cursor->prev->next = db->cursor->next;
1399 
          clipboard->prev = db->cursor;
1400 
          if (db->cursor->next) {
1401 
            db->cursor = db->cursor->next;
1402 
          } else {
1403 
            cursor_up(db);
1404 
          }
1405 
          line_free(clipboard->prev);
1423 mateusz.vi 1406 
          db->totlines -= 1;
1552 mateusz.vi 1407 
          db->modflag = 1;
1410 mateusz.vi 1408 
          uidirty.from = 0;
1409 
          uidirty.to = 0xff;
1412 mateusz.vi 1410 
          recompute_curline(db);
1410 mateusz.vi 1411 
        }
1412 
      }
1413 
 
1420 mateusz.vi 1414 
    } else if ((k == 0x016) && (clipboard != NULL)) { /* CTRL+V */
1415 
      if (line_add(db, clipboard->payload, clipboard->len) != 0) {
1547 mateusz.vi 1416 
        ui_msg(10, 0, 0, SCHEME_ERR); /* ERROR */
1420 mateusz.vi 1417 
        mdr_bios_tickswait(18); /* 1s */
1418 
      } else {
1419 
        /* rewire the linked list so the new line is on top of the previous one */
1420 
        clipboard->prev = db->cursor->prev;
1421 
        /* remove prev node from list */
1422 
        db->cursor->prev = db->cursor->prev->prev;
1423 
        if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor;
1424 
        /* insert the node after cursor now */
1425 
        clipboard->prev->next = db->cursor->next;
1426 
        if (db->cursor->next != NULL) db->cursor->next->prev = clipboard->prev;
1427 
        clipboard->prev->prev = db->cursor;
1428 
        db->cursor->next = clipboard->prev;
1429 
        cursor_down(db);
1552 mateusz.vi 1430 
        db->modflag = 1;
1410 mateusz.vi 1431 
      }
1432 
      uidirty.from = 0;
1433 
      uidirty.to = 0xff;
1412 mateusz.vi 1434 
      recompute_curline(db);
1410 mateusz.vi 1435 
 
1333 mateusz.vi 1436 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 1437 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
1438 
      char buff[4];
1439 
      const char *HEX = "0123456789ABCDEF";
1440 
      buff[0] = HEX[(k >> 8) & 15];
1441 
      buff[1] = HEX[(k >> 4) & 15];
1442 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 1443 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
1444 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1410 mateusz.vi 1445 
      mdr_dos_getkey2();
1275 mateusz.vi 1446 
      break;
1333 mateusz.vi 1447 
#endif
1275 mateusz.vi 1448 
    }
1449 
  }
1450 
 
1451 
  mdr_cout_close();
1452 
 
1414 mateusz.vi 1453 
  /* restore the DOS BREAK flag if it was originally set */
1454 
  if (original_breakflag != 0) mdr_dos_ctrlc_enable();
1455 
 
1320 mateusz.vi 1456 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 1457 
 
1347 mateusz.vi 1458 
  return;
1275 mateusz.vi 1459 
}