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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 
 
1282 mateusz.vi 26 
#include <dos.h>
27 
#include <fcntl.h>
1275 mateusz.vi 28 
#include <stdlib.h>
29 
#include <string.h>
1288 mateusz.vi 30 
#include <malloc.h>   /* _fcalloc() */
1275 mateusz.vi 31 
 
1312 mateusz.vi 32 
#include "mdr\bios.h"
1275 mateusz.vi 33 
#include "mdr\cout.h"
1307 mateusz.vi 34 
#include "mdr\dos.h"
1275 mateusz.vi 35 
#include "mdr\keyb.h"
36 
 
1282 mateusz.vi 37 
#include "svarlang\svarlang.h"
38 
 
1326 mateusz.vi 39 
 
40 
/*****************************************************************************
41 
 * global variables and definitions                                          *
42 
 *****************************************************************************/
1275 mateusz.vi 43 
#define COL_TXT        0
44 
#define COL_STATUSBAR1 1
45 
#define COL_STATUSBAR2 2
46 
#define COL_SCROLLBAR  3
1322 mateusz.vi 47 
#define COL_MSG        4
48 
#define COL_ERR        5
1326 mateusz.vi 49 
 
1275 mateusz.vi 50 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
1324 mateusz.vi 51 
static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70, 0x70, 0xf0};
1327 mateusz.vi 52 
 
1326 mateusz.vi 53 
static unsigned char screenw, screenh;
1275 mateusz.vi 54 
 
1327 mateusz.vi 55 
static struct {
56 
    unsigned char from;
57 
    unsigned char to;
58 
} uidirty = {0, 0xff}; /* make sure to redraw entire UI at first run */
59 
 
1275 mateusz.vi 60 
#define SCROLL_CURSOR 0xB1
61 
 
62 
struct line {
1288 mateusz.vi 63 
  struct line far *prev;
64 
  struct line far *next;
1275 mateusz.vi 65 
  unsigned short len;
66 
  char payload[1];
67 
};
68 
 
1315 mateusz.vi 69 
struct file {
1320 mateusz.vi 70 
  int fd;
1288 mateusz.vi 71 
  struct line far *cursor;
1275 mateusz.vi 72 
  unsigned short xoffset;
1316 mateusz.vi 73 
  unsigned char cursorposx;
74 
  unsigned char cursorposy;
1328 mateusz.vi 75 
  unsigned short totlines;
76 
  unsigned short curline;
1330 mateusz.vi 77 
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
78 
  char modflag;  /* non-zero if file has been modified since last save */
1320 mateusz.vi 79 
  char fname[1]; /* dynamically sized */
1275 mateusz.vi 80 
};
81 
 
82 
 
1326 mateusz.vi 83 
/*****************************************************************************
84 
 * functions                                                                 *
85 
 *****************************************************************************/
86 
 
1328 mateusz.vi 87 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 88 
 * returns non-zero on error */
1328 mateusz.vi 89 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 90 
  struct line far *l;
1275 mateusz.vi 91 
 
1328 mateusz.vi 92 
  l = _fcalloc(1, sizeof(struct line) + slen);
1287 mateusz.vi 93 
  if (l == NULL) return(-1);
94 
 
1275 mateusz.vi 95 
  l->prev = db->cursor;
96 
  if (db->cursor) {
97 
    l->next = db->cursor->next;
98 
    db->cursor->next = l;
99 
    l->next->prev = l;
100 
  }
101 
  db->cursor = l;
1288 mateusz.vi 102 
  _fmemcpy(l->payload, line, slen);
1275 mateusz.vi 103 
  l->len = slen;
1287 mateusz.vi 104 
 
1328 mateusz.vi 105 
  db->totlines += 1;
106 
  db->curline += 1;
107 
 
1287 mateusz.vi 108 
  return(0);
1275 mateusz.vi 109 
}
110 
 
111 
 
1324 mateusz.vi 112 
/* append a nul-terminated string to line at cursor position */
113 
static int line_append(struct file *f, const char far *buf, unsigned short len) {
114 
  struct line far *n;
115 
  if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */
116 
  n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);
117 
  if (n == NULL) return(-1);
118 
  f->cursor = n;
119 
  _fmemcpy(f->cursor->payload + f->cursor->len, buf, len);
120 
  f->cursor->len += len;
121 
 
122 
  /* rewire the linked list */
123 
  if (f->cursor->next) f->cursor->next->prev = f->cursor;
124 
  if (f->cursor->prev) f->cursor->prev->next = f->cursor;
125 
 
126 
  return(0);
127 
}
128 
 
129 
 
1315 mateusz.vi 130 
static void db_rewind(struct file *db) {
1275 mateusz.vi 131 
  if (db->cursor == NULL) return;
132 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 133 
  db->curline = 0;
1275 mateusz.vi 134 
}
135 
 
136 
 
1289 mateusz.vi 137 
static void load_colorscheme(void) {
1275 mateusz.vi 138 
  scheme[COL_TXT] = 0x17;
139 
  scheme[COL_STATUSBAR1] = 0x70;
140 
  scheme[COL_STATUSBAR2] = 0x78;
141 
  scheme[COL_SCROLLBAR] = 0x70;
1324 mateusz.vi 142 
  scheme[COL_MSG] = 0xf0;
1322 mateusz.vi 143 
  scheme[COL_ERR] = 0x4f;
1275 mateusz.vi 144 
}
145 
 
146 
 
1326 mateusz.vi 147 
static void ui_basic(const struct file *db) {
1302 mateusz.vi 148 
  const char *s = svarlang_strid(0); /* HELP */
1275 mateusz.vi 149 
  unsigned char helpcol = screenw - (strlen(s) + 4);
150 
 
1330 mateusz.vi 151 
  /* fill status bar with background (without modflag as it is refreshed by ui_refresh) */
152 
  mdr_cout_char_rep(screenh - 1, 1, ' ', scheme[COL_STATUSBAR1], screenw - 1);
1313 mateusz.vi 153 
 
154 
  /* filename */
1330 mateusz.vi 155 
  {
156 
    const char *fn = db->fname;
157 
    if (*fn == 0) fn = svarlang_str(0, 1);
158 
    mdr_cout_str(screenh - 1, 1, fn, scheme[COL_STATUSBAR1], screenw);
1321 mateusz.vi 159 
  }
1313 mateusz.vi 160 
 
161 
  /* eol type */
1330 mateusz.vi 162 
  {
163 
    const char *eoltype = "CRLF";
164 
    if (db->lfonly) eoltype = "LF";
165 
    mdr_cout_str(screenh - 1, helpcol - 5, eoltype, scheme[COL_STATUSBAR1], 5);
1275 mateusz.vi 166 
  }
1313 mateusz.vi 167 
 
1275 mateusz.vi 168 
  mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);
169 
  mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);
170 
}
171 
 
172 
 
1327 mateusz.vi 173 
static void ui_msg(const char *msg, unsigned char attr) {
1312 mateusz.vi 174 
  unsigned short x, y, msglen, i;
175 
  msglen = strlen(msg);
176 
  y = (screenh - 4) >> 1;
177 
  x = (screenw - msglen - 4) >> 1;
1322 mateusz.vi 178 
  for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
179 
  mdr_cout_str(y+1, x+1, msg, attr, msglen);
1312 mateusz.vi 180 
 
1327 mateusz.vi 181 
  if (uidirty.from > y) uidirty.from = y;
1330 mateusz.vi 182 
  if (uidirty.to < y+3) uidirty.to = y+3;
1312 mateusz.vi 183 
}
184 
 
185 
 
1326 mateusz.vi 186 
static void ui_help(void) {
1309 mateusz.vi 187 
#define MAXLINLEN 35
1312 mateusz.vi 188 
  unsigned short i, offset;
1325 mateusz.vi 189 
  offset = (screenw - MAXLINLEN + 2) >> 1;
1309 mateusz.vi 190 
  mdr_cout_cursor_hide();
1325 mateusz.vi 191 
  for (i = 2; i <= 15; i++) {
192 
    mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);
1309 mateusz.vi 193 
  }
194 
 
195 
  mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);
1325 mateusz.vi 196 
  for (i = 0; i <= 4; i++) {
1309 mateusz.vi 197 
    mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);
198 
  }
1325 mateusz.vi 199 
  mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);
1309 mateusz.vi 200 
 
1325 mateusz.vi 201 
  /* Press any key */
202 
  mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);
203 
 
1309 mateusz.vi 204 
  keyb_getkey();
205 
  mdr_cout_cursor_show();
206 
#undef MAXLINLEN
207 
}
208 
 
209 
 
1327 mateusz.vi 210 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 211 
  unsigned char x;
1310 mateusz.vi 212 
  const struct line far *l;
1316 mateusz.vi 213 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 214 
 
1288 mateusz.vi 215 
#ifdef DBG_REFRESH
1282 mateusz.vi 216 
  static char m = 'a';
217 
  m++;
218 
  if (m > 'z') m = 'a';
1288 mateusz.vi 219 
#endif
1282 mateusz.vi 220 
 
1310 mateusz.vi 221 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 222 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 223 
 
1310 mateusz.vi 224 
  /* iterate over lines and redraw whatever needs to be redrawn */
225 
  for (; l != NULL; l = l->next, y++) {
226 
 
227 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 228 
    if (y < uidirty.from) continue;
229 
    if (y > uidirty.to) break;
1282 mateusz.vi 230 
 
1318 mateusz.vi 231 
    x = 0;
1275 mateusz.vi 232 
    if (db->xoffset < l->len) {
1318 mateusz.vi 233 
      unsigned char i, limit;
234 
      if (l->len - db->xoffset < screenw) {
235 
        limit = l->len;
236 
      } else {
237 
        limit = db->xoffset + screenw - 1;
238 
      }
239 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);
1275 mateusz.vi 240 
    }
1282 mateusz.vi 241 
 
1318 mateusz.vi 242 
    /* write empty spaces until end of line */
243 
    if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);
244 
 
1288 mateusz.vi 245 
#ifdef DBG_REFRESH
1282 mateusz.vi 246 
    mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);
1288 mateusz.vi 247 
#endif
1282 mateusz.vi 248 
 
1275 mateusz.vi 249 
    if (y == screenh - 2) break;
250 
  }
1310 mateusz.vi 251 
 
1319 mateusz.vi 252 
  /* fill all lines below if empty (and they need to be redrawn) */
253 
  if (l == NULL) {
1327 mateusz.vi 254 
    while ((y < screenh - 1) && (y < uidirty.to)) {
1319 mateusz.vi 255 
      mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);
256 
    }
1318 mateusz.vi 257 
  }
1328 mateusz.vi 258 
 
1330 mateusz.vi 259 
  /* "file changed" flag */
260 
  {
261 
    char flg = ' ';
262 
    if (db->modflag) flg = '*';
263 
    mdr_cout_char(screenh - 1, 0, flg, scheme[COL_STATUSBAR1]);
264 
  }
265 
 
1328 mateusz.vi 266 
  /* scroll bar */
267 
  for (y = 0; y < (screenh - 1); y++) {
268 
    mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);
269 
  }
270 
 
271 
  /* scroll cursor */
272 
  if (db->totlines >= screenh) {
273 
    unsigned short topline = db->curline - db->cursorposy;
274 
    unsigned short col;
275 
    unsigned short totlines = db->totlines - screenh + 1;
276 
    if (db->totlines - screenh > screenh) {
277 
      col = topline / (totlines / (screenh - 1));
278 
    } else {
279 
      col = topline * (screenh - 1) / totlines;
280 
    }
281 
    if (col >= screenh - 1) col = screenh - 2;
282 
    mdr_cout_char(col, screenw - 1, ' ', scheme[COL_SCROLLBAR]);
283 
  }
1275 mateusz.vi 284 
}
285 
 
286 
 
1327 mateusz.vi 287 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 288 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 289 
 
290 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 291 
    db->cursorposx = 0;
1275 mateusz.vi 292 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 293 
    uidirty.from = 0;
294 
    uidirty.to = 0xff;
1275 mateusz.vi 295 
  } else {
1316 mateusz.vi 296 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 297 
  }
298 
}
299 
 
300 
 
1327 mateusz.vi 301 
static void cursor_up(struct file *db) {
1275 mateusz.vi 302 
  if (db->cursor->prev != NULL) {
1328 mateusz.vi 303 
    db->curline -= 1;
1275 mateusz.vi 304 
    db->cursor = db->cursor->prev;
1316 mateusz.vi 305 
    if (db->cursorposy == 0) {
1327 mateusz.vi 306 
      uidirty.from = 0;
307 
      uidirty.to = 0xff;
1275 mateusz.vi 308 
    } else {
1316 mateusz.vi 309 
      db->cursorposy -= 1;
1275 mateusz.vi 310 
    }
311 
  }
312 
}
313 
 
314 
 
1327 mateusz.vi 315 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 316 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 317 
  if (db->xoffset > db->cursor->len) {
318 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 319 
    uidirty.from = 0;
320 
    uidirty.to = 0xff;
1282 mateusz.vi 321 
  }
322 
 
323 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
324 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 325 
    uidirty.from = 0;
326 
    uidirty.to = 0xff;
1282 mateusz.vi 327 
  }
1316 mateusz.vi 328 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 329 
}
330 
 
331 
 
1327 mateusz.vi 332 
static void cursor_down(struct file *db) {
1276 mateusz.vi 333 
  if (db->cursor->next != NULL) {
1328 mateusz.vi 334 
    db->curline += 1;
1276 mateusz.vi 335 
    db->cursor = db->cursor->next;
1316 mateusz.vi 336 
    if (db->cursorposy < screenh - 2) {
337 
      db->cursorposy += 1;
1276 mateusz.vi 338 
    } else {
1327 mateusz.vi 339 
      uidirty.from = 0;
340 
      uidirty.to = 0xff;
1276 mateusz.vi 341 
    }
342 
  }
343 
}
344 
 
345 
 
1327 mateusz.vi 346 
static void cursor_left(struct file *db) {
1316 mateusz.vi 347 
  if (db->cursorposx > 0) {
348 
    db->cursorposx -= 1;
1302 mateusz.vi 349 
  } else if (db->xoffset > 0) {
350 
    db->xoffset -= 1;
1327 mateusz.vi 351 
    uidirty.from = 0;
352 
    uidirty.to = 0xff;
1302 mateusz.vi 353 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 354 
    cursor_up(db);
355 
    cursor_eol(db);
1302 mateusz.vi 356 
  }
357 
}
358 
 
359 
 
1327 mateusz.vi 360 
static void cursor_home(struct file *db) {
1316 mateusz.vi 361 
  db->cursorposx = 0;
1282 mateusz.vi 362 
  if (db->xoffset != 0) {
363 
    db->xoffset = 0;
1327 mateusz.vi 364 
    uidirty.from = 0;
365 
    uidirty.to = 0xff;
1282 mateusz.vi 366 
  }
1276 mateusz.vi 367 
}
368 
 
369 
 
1327 mateusz.vi 370 
static void cursor_right(struct file *db) {
1316 mateusz.vi 371 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
372 
    if (db->cursorposx < screenw - 2) {
373 
      db->cursorposx += 1;
1308 mateusz.vi 374 
    } else {
375 
      db->xoffset += 1;
1327 mateusz.vi 376 
      uidirty.from = 0;
377 
      uidirty.to = 0xff;
1308 mateusz.vi 378 
    }
379 
  } else {
1327 mateusz.vi 380 
    cursor_down(db);
381 
    cursor_home(db);
1308 mateusz.vi 382 
  }
383 
}
384 
 
385 
 
1327 mateusz.vi 386 
static void del(struct file *db) {
1316 mateusz.vi 387 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
388 
    _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 389 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 390 
    uidirty.from = db->cursorposy;
391 
    uidirty.to = db->cursorposy;
1330 mateusz.vi 392 
    db->modflag = 1;
1292 mateusz.vi 393 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
394 
    struct line far *nextline = db->cursor->next;
395 
    if (db->cursor->next->len > 0) {
396 
      void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);
397 
      if (newptr != NULL) {
398 
        db->cursor = newptr;
399 
        _fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
400 
        db->cursor->len += db->cursor->next->len;
401 
      }
402 
    }
403 
    db->cursor->next = db->cursor->next->next;
404 
    db->cursor->next->prev = db->cursor;
405 
    if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
406 
    _ffree(nextline);
1327 mateusz.vi 407 
    uidirty.from = db->cursorposy;
408 
    uidirty.to = 0xff;
1328 mateusz.vi 409 
    db->totlines -= 1;
1330 mateusz.vi 410 
    db->modflag = 1;
1292 mateusz.vi 411 
  }
412 
}
413 
 
414 
 
1327 mateusz.vi 415 
static void bkspc(struct file *db) {
1302 mateusz.vi 416 
 
417 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1316 mateusz.vi 418 
  if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 419 
 
1327 mateusz.vi 420 
  cursor_left(db);
421 
  del(db);
1302 mateusz.vi 422 
}
423 
 
424 
 
1286 mateusz.vi 425 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
426 
 * of argc and argv, saves some 330 bytes of binary size */
427 
static char *parseargv(void) {
428 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
429 
  unsigned char count = 0;
430 
  char *argv[4];
431 
 
432 
  while (count < 4) {
433 
    /* jump to nearest arg */
434 
    while (*tail == ' ') {
435 
      *tail = 0;
436 
      tail++;
437 
    }
438 
 
439 
    if (*tail == '\r') {
440 
      *tail = 0;
441 
      break;
442 
    }
443 
 
444 
    argv[count++] = tail;
445 
 
446 
    /* jump to next delimiter */
447 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
448 
  }
449 
 
450 
  /* check args now */
1321 mateusz.vi 451 
  if (count == 0) return("");
1286 mateusz.vi 452 
 
453 
  return(argv[0]);
454 
}
455 
 
456 
 
1320 mateusz.vi 457 
static struct file *loadfile(const char *fname) {
1324 mateusz.vi 458 
  char buff[512]; /* read one entire sector at a time (faster) */
459 
  char *buffptr;
460 
  unsigned int len, llen;
1287 mateusz.vi 461 
  int fd;
1324 mateusz.vi 462 
  unsigned char eolfound;
1320 mateusz.vi 463 
  struct file *db;
1287 mateusz.vi 464 
 
1321 mateusz.vi 465 
  len = strlen(fname) + 1;
466 
  db = calloc(1, sizeof(struct file) + len);
467 
  if (db == NULL) return(NULL);
468 
  memcpy(db->fname, fname, len);
469 
 
470 
  if (*fname == 0) goto SKIPLOADING;
471 
 
1287 mateusz.vi 472 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
473 
    mdr_coutraw_puts("Failed to open file:");
474 
    mdr_coutraw_puts(fname);
1321 mateusz.vi 475 
    free(db);
1320 mateusz.vi 476 
    return(NULL);
1287 mateusz.vi 477 
  }
478 
 
1313 mateusz.vi 479 
  db->lfonly = 1;
480 
 
1324 mateusz.vi 481 
  /* start by adding an empty line */
1328 mateusz.vi 482 
  if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 483 
    /* TODO ERROR HANDLING */
484 
  }
1287 mateusz.vi 485 
 
1324 mateusz.vi 486 
  for (eolfound = 0;;) {
487 
    unsigned short consumedbytes;
488 
 
489 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
490 
    buffptr = buff;
491 
 
492 
    FINDLINE:
493 
 
494 
    /* look for nearest \n */
495 
    for (consumedbytes = 0;; consumedbytes++) {
496 
      if (consumedbytes == len) {
497 
        llen = consumedbytes;
498 
        break;
1323 mateusz.vi 499 
      }
1324 mateusz.vi 500 
      if (buffptr[consumedbytes] == '\r') {
501 
        llen = consumedbytes;
502 
        consumedbytes++;
503 
        db->lfonly = 0;
1320 mateusz.vi 504 
        break;
505 
      }
1324 mateusz.vi 506 
      if (buffptr[consumedbytes] == '\n') {
507 
        eolfound = 1;
508 
        llen = consumedbytes;
509 
        consumedbytes++;
510 
        break;
511 
      }
1287 mateusz.vi 512 
    }
1324 mateusz.vi 513 
 
514 
    /* consumedbytes is the amount of bytes processed from buffptr,
515 
     * llen is the length of line's payload (without its line terminator) */
516 
 
517 
    /* append content, if line is non-empty */
518 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1287 mateusz.vi 519 
      mdr_coutraw_puts("out of memory");
1320 mateusz.vi 520 
      free(db);
521 
      db = NULL;
1287 mateusz.vi 522 
      break;
523 
    }
524 
 
1324 mateusz.vi 525 
    /* add a new line if necessary */
526 
    if (eolfound) {
1328 mateusz.vi 527 
      if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 528 
      /* TODO ERROR HANDLING */
529 
        mdr_coutraw_puts("out of memory");
530 
        free(db);
531 
        db = NULL;
532 
        break;
533 
      }
534 
      eolfound = 0;
535 
    }
1287 mateusz.vi 536 
 
1324 mateusz.vi 537 
    /* anything left? process the buffer leftover again */
538 
    if (consumedbytes < len) {
539 
      len -= consumedbytes;
540 
      buffptr += consumedbytes;
541 
      goto FINDLINE;
542 
    }
543 
 
544 
  }
545 
 
1287 mateusz.vi 546 
  _dos_close(fd);
547 
 
1321 mateusz.vi 548 
  SKIPLOADING:
549 
 
1320 mateusz.vi 550 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
551 
  if (db != NULL) {
1328 mateusz.vi 552 
    if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
1320 mateusz.vi 553 
    db_rewind(db);
554 
  }
555 
 
556 
  return(db);
1287 mateusz.vi 557 
}
558 
 
559 
 
1320 mateusz.vi 560 
static int savefile(const struct file *db) {
1311 mateusz.vi 561 
  int fd;
562 
  const struct line far *l;
563 
  unsigned bytes;
1313 mateusz.vi 564 
  unsigned char eollen;
565 
  unsigned char eolbuf[2];
566 
 
1320 mateusz.vi 567 
  if (_dos_open(db->fname, O_WRONLY, &fd) != 0) {
1311 mateusz.vi 568 
    return(-1);
569 
  }
570 
 
571 
  l = db->cursor;
572 
  while (l->prev) l = l->prev;
573 
 
1313 mateusz.vi 574 
  /* preset line terminators */
575 
  if (db->lfonly) {
576 
    eolbuf[0] = '\n';
577 
    eollen = 1;
578 
  } else {
579 
    eolbuf[0] = '\r';
580 
    eolbuf[1] = '\n';
581 
    eollen = 2;
582 
  }
583 
 
1311 mateusz.vi 584 
  while (l) {
1324 mateusz.vi 585 
    /* do not write the last empty line, it is only useful for edition */
586 
    if (l->len != 0) {
587 
      _dos_write(fd, l->payload, l->len, &bytes);
588 
    } else if (l->next == NULL) {
589 
      break;
590 
    }
1313 mateusz.vi 591 
    _dos_write(fd, eolbuf, eollen, &bytes);
1311 mateusz.vi 592 
    l = l->next;
593 
  }
594 
 
595 
  _dos_close(fd);
1330 mateusz.vi 596 
 
1311 mateusz.vi 597 
  return(0);
598 
}
599 
 
600 
 
1327 mateusz.vi 601 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1317 mateusz.vi 602 
  struct line far *n;
603 
  n = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + len);
604 
  if (n != NULL) {
605 
    unsigned short off = db->xoffset + db->cursorposx;
1330 mateusz.vi 606 
    db->modflag = 1;
1317 mateusz.vi 607 
    if (n->prev) n->prev->next = n;
608 
    if (n->next) n->next->prev = n;
609 
    db->cursor = n;
610 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
611 
    db->cursor->len += len;
1327 mateusz.vi 612 
    uidirty.from = db->cursorposy;
613 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 614 
    while (len--) {
615 
      db->cursor->payload[off++] = *databuf;
616 
      databuf++;
1327 mateusz.vi 617 
      cursor_right(db);
1317 mateusz.vi 618 
    }
619 
  }
620 
}
621 
 
622 
 
1286 mateusz.vi 623 
int main(void) {
624 
  const char *fname;
1320 mateusz.vi 625 
  struct file *db;
1275 mateusz.vi 626 
 
1307 mateusz.vi 627 
  {
628 
    char nlspath[128], lang[8];
629 
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
630 
  }
1282 mateusz.vi 631 
 
1286 mateusz.vi 632 
  fname = parseargv();
633 
 
634 
  if (fname == NULL) {
1302 mateusz.vi 635 
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
1275 mateusz.vi 636 
    return(0);
637 
  }
638 
 
1282 mateusz.vi 639 
  /* load file */
1320 mateusz.vi 640 
  db = loadfile(fname);
641 
  if (db == NULL) return(1);
1282 mateusz.vi 642 
 
1275 mateusz.vi 643 
  if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();
1326 mateusz.vi 644 
  ui_basic(db);
1275 mateusz.vi 645 
 
646 
  for (;;) {
647 
    int k;
648 
 
1327 mateusz.vi 649 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 650 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 651 
 
1327 mateusz.vi 652 
    if (uidirty.from != 0xff) {
653 
      ui_refresh(db);
654 
      uidirty.from = 0xff;
1282 mateusz.vi 655 
    }
1328 mateusz.vi 656 
#ifdef DBG_LINENUM
657 
      {
658 
        char ddd[10];
659 
        db->curline += 1;
660 
        ddd[0] = '0' + db->curline / 100;
661 
        ddd[1] = '0' + (db->curline % 100) / 10;
662 
        ddd[2] = '0' + (db->curline % 10);
663 
        db->curline -= 1;
664 
        ddd[3] = '/';
665 
        ddd[4] = '0' + db->totlines / 100;
666 
        ddd[5] = '0' + (db->totlines % 100) / 10;
667 
        ddd[6] = '0' + (db->totlines % 10);
668 
        ddd[7] = 0;
669 
        mdr_cout_str(screenh - 1, 40, ddd, scheme[COL_STATUSBAR1], sizeof(ddd));
670 
      }
671 
#endif
1275 mateusz.vi 672 
 
673 
    k = keyb_getkey();
1282 mateusz.vi 674 
 
1275 mateusz.vi 675 
    if (k == 0x150) { /* down */
1327 mateusz.vi 676 
      cursor_down(db);
1275 mateusz.vi 677 
 
678 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 679 
      cursor_up(db);
1275 mateusz.vi 680 
 
681 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 682 
      cursor_right(db);
1275 mateusz.vi 683 
 
684 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 685 
      cursor_left(db);
1275 mateusz.vi 686 
 
1282 mateusz.vi 687 
    } else if (k == 0x149) { /* pgup */
688 
      // TODO
689 
 
690 
    } else if (k == 0x151) { /* pgdown */
691 
      // TODO
692 
 
693 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 694 
       cursor_home(db);
1282 mateusz.vi 695 
 
696 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 697 
       cursor_eol(db);
1282 mateusz.vi 698 
 
1275 mateusz.vi 699 
    } else if (k == 0x1B) { /* ESC */
700 
      break;
701 
 
1289 mateusz.vi 702 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 703 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 704 
      /* add a new line */
1328 mateusz.vi 705 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1330 mateusz.vi 706 
        db->modflag = 1;
1328 mateusz.vi 707 
        db->cursor = db->cursor->prev; /* back to original line */
708 
        db->curline -= 1;
1289 mateusz.vi 709 
        /* trim the line above */
1328 mateusz.vi 710 
        db->cursor->len = off;
1289 mateusz.vi 711 
        /* move cursor to the (new) line below */
1328 mateusz.vi 712 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 713 
        uidirty.to = 0xff;
1328 mateusz.vi 714 
        cursor_down(db);
715 
        cursor_home(db);
1289 mateusz.vi 716 
      } else {
717 
        /* ERROR: OUT OF MEMORY */
718 
      }
719 
 
1292 mateusz.vi 720 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 721 
      del(db);
1292 mateusz.vi 722 
 
1302 mateusz.vi 723 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 724 
      bkspc(db);
1302 mateusz.vi 725 
 
1308 mateusz.vi 726 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 727 
      char c = k;
1327 mateusz.vi 728 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 729 
 
1317 mateusz.vi 730 
    } else if (k == 0x009) { /* TAB */
731 
      const char *tab = "        ";
1327 mateusz.vi 732 
      insert_in_line(db, tab, 8);
1317 mateusz.vi 733 
 
1309 mateusz.vi 734 
    } else if (k == 0x13b) { /* F1 */
1326 mateusz.vi 735 
      ui_help();
1327 mateusz.vi 736 
      uidirty.from = 0;
737 
      uidirty.to = 0xff;
1309 mateusz.vi 738 
 
1311 mateusz.vi 739 
    } else if (k == 0x13f) { /* F5 */
1322 mateusz.vi 740 
      if (savefile(db) == 0) {
1330 mateusz.vi 741 
        db->modflag = 0;
1327 mateusz.vi 742 
        ui_msg(svarlang_str(0, 2), scheme[COL_MSG]);
1322 mateusz.vi 743 
        mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
744 
      } else {
1327 mateusz.vi 745 
        ui_msg(svarlang_str(0, 3), scheme[COL_ERR]);
1322 mateusz.vi 746 
        mdr_bios_tickswait(36); /* 2s */
747 
      }
1311 mateusz.vi 748 
 
1314 mateusz.vi 749 
    } else if (k == 0x144) { /* F10 */
1330 mateusz.vi 750 
      db->modflag = 1;
1320 mateusz.vi 751 
      db->lfonly ^= 1;
1326 mateusz.vi 752 
      ui_basic(db);
1314 mateusz.vi 753 
 
1325 mateusz.vi 754 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
755 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
756 
      for (;;) {
757 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
758 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 759 
        cursor_right(db);
1325 mateusz.vi 760 
      }
761 
      /* now skip to next non-space or end of file */
762 
      for (;;) {
1327 mateusz.vi 763 
        cursor_right(db);
1325 mateusz.vi 764 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
765 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
766 
      }
767 
 
768 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 769 
      cursor_left(db);
1325 mateusz.vi 770 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
771 
      for (;;) {
772 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
773 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 774 
        cursor_left(db);
1325 mateusz.vi 775 
      }
776 
      /* now skip to next space or start of file */
777 
      for (;;) {
1327 mateusz.vi 778 
        cursor_left(db);
1325 mateusz.vi 779 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 780 
          cursor_right(db);
1325 mateusz.vi 781 
          break;
782 
        }
783 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
784 
      }
785 
 
1282 mateusz.vi 786 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
787 
      char buff[4];
788 
      const char *HEX = "0123456789ABCDEF";
789 
      buff[0] = HEX[(k >> 8) & 15];
790 
      buff[1] = HEX[(k >> 4) & 15];
791 
      buff[2] = HEX[k & 15];
792 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", scheme[COL_STATUSBAR1], 17);
793 
      mdr_cout_str(screenh - 1, 17, buff, scheme[COL_STATUSBAR1], 3);
1275 mateusz.vi 794 
      keyb_getkey();
795 
      break;
796 
    }
797 
  }
798 
 
799 
  mdr_cout_close();
800 
 
1320 mateusz.vi 801 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 802 
 
803 
  return(0);
804 
}