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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 
 *****************************************************************************/
43 
 
1275 mateusz.vi 44 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
1333 mateusz.vi 45 
// 11 524
46 
static unsigned char SCHEME_TEXT   = 0x07,
47 
                     SCHEME_STBAR1 = 0x70,
48 
                     SCHEME_STBAR2 = 0x70,
49 
                     SCHEME_STBAR3 = 0xf0,
50 
                     SCHEME_SCROLL = 0x70,
51 
                     SCHEME_MSG    = 0x70,
52 
                     SCHEME_ERR    = 0xf0;
1327 mateusz.vi 53 
 
1326 mateusz.vi 54 
static unsigned char screenw, screenh;
1275 mateusz.vi 55 
 
1327 mateusz.vi 56 
static struct {
57 
    unsigned char from;
58 
    unsigned char to;
59 
} uidirty = {0, 0xff}; /* make sure to redraw entire UI at first run */
60 
 
1275 mateusz.vi 61 
#define SCROLL_CURSOR 0xB1
62 
 
63 
struct line {
1288 mateusz.vi 64 
  struct line far *prev;
65 
  struct line far *next;
1275 mateusz.vi 66 
  unsigned short len;
67 
  char payload[1];
68 
};
69 
 
1315 mateusz.vi 70 
struct file {
1320 mateusz.vi 71 
  int fd;
1288 mateusz.vi 72 
  struct line far *cursor;
1275 mateusz.vi 73 
  unsigned short xoffset;
1316 mateusz.vi 74 
  unsigned char cursorposx;
75 
  unsigned char cursorposy;
1328 mateusz.vi 76 
  unsigned short totlines;
77 
  unsigned short curline;
1330 mateusz.vi 78 
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
79 
  char modflag;  /* non-zero if file has been modified since last save */
1332 mateusz.vi 80 
  char fname[128];
1275 mateusz.vi 81 
};
82 
 
83 
 
1326 mateusz.vi 84 
/*****************************************************************************
85 
 * functions                                                                 *
86 
 *****************************************************************************/
87 
 
1328 mateusz.vi 88 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 89 
 * returns non-zero on error */
1328 mateusz.vi 90 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 91 
  struct line far *l;
1275 mateusz.vi 92 
 
1328 mateusz.vi 93 
  l = _fcalloc(1, sizeof(struct line) + slen);
1287 mateusz.vi 94 
  if (l == NULL) return(-1);
95 
 
1275 mateusz.vi 96 
  l->prev = db->cursor;
97 
  if (db->cursor) {
98 
    l->next = db->cursor->next;
99 
    db->cursor->next = l;
100 
    l->next->prev = l;
101 
  }
102 
  db->cursor = l;
1288 mateusz.vi 103 
  _fmemcpy(l->payload, line, slen);
1275 mateusz.vi 104 
  l->len = slen;
1287 mateusz.vi 105 
 
1328 mateusz.vi 106 
  db->totlines += 1;
107 
  db->curline += 1;
108 
 
1287 mateusz.vi 109 
  return(0);
1275 mateusz.vi 110 
}
111 
 
112 
 
1332 mateusz.vi 113 
static void ui_getstring(const char *query, char *s, unsigned char maxlen) {
114 
  unsigned char len = 0, y, x;
115 
  int k;
116 
 
117 
  if (maxlen == 0) return;
118 
  maxlen--; /* make room for the nul terminator */
119 
 
120 
  y = screenh - 1;
121 
 
122 
  /* print query string */
1333 mateusz.vi 123 
  x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);
124 
  mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 125 
 
126 
  for (;;) {
127 
    mdr_cout_locate(y, x + len);
128 
    k = keyb_getkey();
129 
 
130 
    if (k == 0x1b) return; /* ESC */
131 
 
132 
    if (k == '\r') {
133 
      s[len] = 0;
134 
      return;
135 
    }
136 
 
137 
    if ((k == 0x08) && (len > 0)) { /* BKSPC */
138 
      len--;
1333 mateusz.vi 139 
      mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);
1332 mateusz.vi 140 
      continue;
141 
    }
142 
 
143 
    if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
1333 mateusz.vi 144 
      mdr_cout_char(y, x + len, k, SCHEME_STBAR3);
1332 mateusz.vi 145 
      s[len++] = k;
146 
    }
147 
 
148 
  }
149 
}
150 
 
151 
 
1324 mateusz.vi 152 
/* append a nul-terminated string to line at cursor position */
153 
static int line_append(struct file *f, const char far *buf, unsigned short len) {
154 
  struct line far *n;
155 
  if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */
156 
  n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);
157 
  if (n == NULL) return(-1);
158 
  f->cursor = n;
159 
  _fmemcpy(f->cursor->payload + f->cursor->len, buf, len);
160 
  f->cursor->len += len;
161 
 
162 
  /* rewire the linked list */
163 
  if (f->cursor->next) f->cursor->next->prev = f->cursor;
164 
  if (f->cursor->prev) f->cursor->prev->next = f->cursor;
165 
 
166 
  return(0);
167 
}
168 
 
169 
 
1315 mateusz.vi 170 
static void db_rewind(struct file *db) {
1275 mateusz.vi 171 
  if (db->cursor == NULL) return;
172 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 173 
  db->curline = 0;
1275 mateusz.vi 174 
}
175 
 
176 
 
1326 mateusz.vi 177 
static void ui_basic(const struct file *db) {
1302 mateusz.vi 178 
  const char *s = svarlang_strid(0); /* HELP */
1275 mateusz.vi 179 
  unsigned char helpcol = screenw - (strlen(s) + 4);
180 
 
1330 mateusz.vi 181 
  /* fill status bar with background (without modflag as it is refreshed by ui_refresh) */
1333 mateusz.vi 182 
  mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);
1313 mateusz.vi 183 
 
184 
  /* filename */
1330 mateusz.vi 185 
  {
186 
    const char *fn = db->fname;
187 
    if (*fn == 0) fn = svarlang_str(0, 1);
1333 mateusz.vi 188 
    mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);
1321 mateusz.vi 189 
  }
1313 mateusz.vi 190 
 
191 
  /* eol type */
1330 mateusz.vi 192 
  {
193 
    const char *eoltype = "CRLF";
194 
    if (db->lfonly) eoltype = "LF";
1333 mateusz.vi 195 
    mdr_cout_str(screenh - 1, helpcol - 5, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 196 
  }
1313 mateusz.vi 197 
 
1333 mateusz.vi 198 
  mdr_cout_str(screenh - 1, helpcol, " F1=", SCHEME_STBAR2, 40);
199 
  mdr_cout_str(screenh - 1, helpcol + 4, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 200 
}
201 
 
202 
 
1331 mateusz.vi 203 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
1312 mateusz.vi 204 
  unsigned short x, y, msglen, i;
1331 mateusz.vi 205 
  unsigned char msg2flag = 0;
206 
 
207 
  msglen = strlen(msg1);
208 
  if (msg2) {
209 
    msg2flag = 1;
210 
    i = strlen(msg2);
211 
    if (i > msglen) msglen = i;
212 
  }
213 
 
214 
  y = (screenh - 6) >> 1;
1312 mateusz.vi 215 
  x = (screenw - msglen - 4) >> 1;
1331 mateusz.vi 216 
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
217 
  x++;
218 
  mdr_cout_str(y+1, x, msg1, attr, msglen);
219 
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
1312 mateusz.vi 220 
 
1327 mateusz.vi 221 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 222 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 223 
}
224 
 
225 
 
1326 mateusz.vi 226 
static void ui_help(void) {
1309 mateusz.vi 227 
#define MAXLINLEN 35
1312 mateusz.vi 228 
  unsigned short i, offset;
1325 mateusz.vi 229 
  offset = (screenw - MAXLINLEN + 2) >> 1;
1309 mateusz.vi 230 
  mdr_cout_cursor_hide();
1325 mateusz.vi 231 
  for (i = 2; i <= 15; i++) {
1333 mateusz.vi 232 
    mdr_cout_char_rep(i, offset - 2, ' ', SCHEME_STBAR1, MAXLINLEN + 2);
1309 mateusz.vi 233 
  }
234 
 
1333 mateusz.vi 235 
  mdr_cout_str(3, offset, svarlang_str(0, 0), SCHEME_STBAR1, MAXLINLEN);
1325 mateusz.vi 236 
  for (i = 0; i <= 4; i++) {
1333 mateusz.vi 237 
    mdr_cout_str(5 + i, offset, svarlang_str(8, i), SCHEME_STBAR1, MAXLINLEN);
1309 mateusz.vi 238 
  }
1333 mateusz.vi 239 
  mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), SCHEME_STBAR1, MAXLINLEN);
1309 mateusz.vi 240 
 
1325 mateusz.vi 241 
  /* Press any key */
1333 mateusz.vi 242 
  mdr_cout_str(14, offset, svarlang_str(8, 11), SCHEME_STBAR1, MAXLINLEN);
1325 mateusz.vi 243 
 
1309 mateusz.vi 244 
  keyb_getkey();
245 
  mdr_cout_cursor_show();
246 
#undef MAXLINLEN
247 
}
248 
 
249 
 
1327 mateusz.vi 250 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 251 
  unsigned char x;
1310 mateusz.vi 252 
  const struct line far *l;
1316 mateusz.vi 253 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 254 
 
1288 mateusz.vi 255 
#ifdef DBG_REFRESH
1282 mateusz.vi 256 
  static char m = 'a';
257 
  m++;
258 
  if (m > 'z') m = 'a';
1288 mateusz.vi 259 
#endif
1282 mateusz.vi 260 
 
1310 mateusz.vi 261 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 262 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 263 
 
1310 mateusz.vi 264 
  /* iterate over lines and redraw whatever needs to be redrawn */
265 
  for (; l != NULL; l = l->next, y++) {
266 
 
267 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 268 
    if (y < uidirty.from) continue;
269 
    if (y > uidirty.to) break;
1282 mateusz.vi 270 
 
1318 mateusz.vi 271 
    x = 0;
1275 mateusz.vi 272 
    if (db->xoffset < l->len) {
1318 mateusz.vi 273 
      unsigned char i, limit;
274 
      if (l->len - db->xoffset < screenw) {
275 
        limit = l->len;
276 
      } else {
277 
        limit = db->xoffset + screenw - 1;
278 
      }
1333 mateusz.vi 279 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 280 
    }
1282 mateusz.vi 281 
 
1318 mateusz.vi 282 
    /* write empty spaces until end of line */
1333 mateusz.vi 283 
    if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);
1318 mateusz.vi 284 
 
1288 mateusz.vi 285 
#ifdef DBG_REFRESH
1333 mateusz.vi 286 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 287 
#endif
1282 mateusz.vi 288 
 
1275 mateusz.vi 289 
    if (y == screenh - 2) break;
290 
  }
1310 mateusz.vi 291 
 
1319 mateusz.vi 292 
  /* fill all lines below if empty (and they need to be redrawn) */
293 
  if (l == NULL) {
1327 mateusz.vi 294 
    while ((y < screenh - 1) && (y < uidirty.to)) {
1333 mateusz.vi 295 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);
1319 mateusz.vi 296 
    }
1318 mateusz.vi 297 
  }
1328 mateusz.vi 298 
 
1330 mateusz.vi 299 
  /* "file changed" flag */
300 
  {
301 
    char flg = ' ';
302 
    if (db->modflag) flg = '*';
1333 mateusz.vi 303 
    mdr_cout_char(screenh - 1, 0, flg, SCHEME_STBAR1);
1330 mateusz.vi 304 
  }
305 
 
1328 mateusz.vi 306 
  /* scroll bar */
307 
  for (y = 0; y < (screenh - 1); y++) {
1333 mateusz.vi 308 
    mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 309 
  }
310 
 
311 
  /* scroll cursor */
312 
  if (db->totlines >= screenh) {
313 
    unsigned short topline = db->curline - db->cursorposy;
314 
    unsigned short col;
315 
    unsigned short totlines = db->totlines - screenh + 1;
316 
    if (db->totlines - screenh > screenh) {
317 
      col = topline / (totlines / (screenh - 1));
318 
    } else {
319 
      col = topline * (screenh - 1) / totlines;
320 
    }
321 
    if (col >= screenh - 1) col = screenh - 2;
1333 mateusz.vi 322 
    mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);
1328 mateusz.vi 323 
  }
1275 mateusz.vi 324 
}
325 
 
326 
 
1327 mateusz.vi 327 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 328 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 329 
 
330 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 331 
    db->cursorposx = 0;
1275 mateusz.vi 332 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 333 
    uidirty.from = 0;
334 
    uidirty.to = 0xff;
1275 mateusz.vi 335 
  } else {
1316 mateusz.vi 336 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 337 
  }
338 
}
339 
 
340 
 
1327 mateusz.vi 341 
static void cursor_up(struct file *db) {
1275 mateusz.vi 342 
  if (db->cursor->prev != NULL) {
1328 mateusz.vi 343 
    db->curline -= 1;
1275 mateusz.vi 344 
    db->cursor = db->cursor->prev;
1316 mateusz.vi 345 
    if (db->cursorposy == 0) {
1327 mateusz.vi 346 
      uidirty.from = 0;
347 
      uidirty.to = 0xff;
1275 mateusz.vi 348 
    } else {
1316 mateusz.vi 349 
      db->cursorposy -= 1;
1275 mateusz.vi 350 
    }
351 
  }
352 
}
353 
 
354 
 
1327 mateusz.vi 355 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 356 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 357 
  if (db->xoffset > db->cursor->len) {
358 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 359 
    uidirty.from = 0;
360 
    uidirty.to = 0xff;
1282 mateusz.vi 361 
  }
362 
 
363 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
364 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 365 
    uidirty.from = 0;
366 
    uidirty.to = 0xff;
1282 mateusz.vi 367 
  }
1316 mateusz.vi 368 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 369 
}
370 
 
371 
 
1327 mateusz.vi 372 
static void cursor_down(struct file *db) {
1276 mateusz.vi 373 
  if (db->cursor->next != NULL) {
1328 mateusz.vi 374 
    db->curline += 1;
1276 mateusz.vi 375 
    db->cursor = db->cursor->next;
1316 mateusz.vi 376 
    if (db->cursorposy < screenh - 2) {
377 
      db->cursorposy += 1;
1276 mateusz.vi 378 
    } else {
1327 mateusz.vi 379 
      uidirty.from = 0;
380 
      uidirty.to = 0xff;
1276 mateusz.vi 381 
    }
382 
  }
383 
}
384 
 
385 
 
1327 mateusz.vi 386 
static void cursor_left(struct file *db) {
1316 mateusz.vi 387 
  if (db->cursorposx > 0) {
388 
    db->cursorposx -= 1;
1302 mateusz.vi 389 
  } else if (db->xoffset > 0) {
390 
    db->xoffset -= 1;
1327 mateusz.vi 391 
    uidirty.from = 0;
392 
    uidirty.to = 0xff;
1302 mateusz.vi 393 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 394 
    cursor_up(db);
395 
    cursor_eol(db);
1302 mateusz.vi 396 
  }
397 
}
398 
 
399 
 
1327 mateusz.vi 400 
static void cursor_home(struct file *db) {
1316 mateusz.vi 401 
  db->cursorposx = 0;
1282 mateusz.vi 402 
  if (db->xoffset != 0) {
403 
    db->xoffset = 0;
1327 mateusz.vi 404 
    uidirty.from = 0;
405 
    uidirty.to = 0xff;
1282 mateusz.vi 406 
  }
1276 mateusz.vi 407 
}
408 
 
409 
 
1327 mateusz.vi 410 
static void cursor_right(struct file *db) {
1316 mateusz.vi 411 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
412 
    if (db->cursorposx < screenw - 2) {
413 
      db->cursorposx += 1;
1308 mateusz.vi 414 
    } else {
415 
      db->xoffset += 1;
1327 mateusz.vi 416 
      uidirty.from = 0;
417 
      uidirty.to = 0xff;
1308 mateusz.vi 418 
    }
419 
  } else {
1327 mateusz.vi 420 
    cursor_down(db);
421 
    cursor_home(db);
1308 mateusz.vi 422 
  }
423 
}
424 
 
425 
 
1327 mateusz.vi 426 
static void del(struct file *db) {
1316 mateusz.vi 427 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
428 
    _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 429 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 430 
    uidirty.from = db->cursorposy;
431 
    uidirty.to = db->cursorposy;
1330 mateusz.vi 432 
    db->modflag = 1;
1292 mateusz.vi 433 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
434 
    struct line far *nextline = db->cursor->next;
435 
    if (db->cursor->next->len > 0) {
436 
      void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);
437 
      if (newptr != NULL) {
438 
        db->cursor = newptr;
439 
        _fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
440 
        db->cursor->len += db->cursor->next->len;
441 
      }
442 
    }
443 
    db->cursor->next = db->cursor->next->next;
444 
    db->cursor->next->prev = db->cursor;
445 
    if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
446 
    _ffree(nextline);
1327 mateusz.vi 447 
    uidirty.from = db->cursorposy;
448 
    uidirty.to = 0xff;
1328 mateusz.vi 449 
    db->totlines -= 1;
1330 mateusz.vi 450 
    db->modflag = 1;
1292 mateusz.vi 451 
  }
452 
}
453 
 
454 
 
1327 mateusz.vi 455 
static void bkspc(struct file *db) {
1302 mateusz.vi 456 
 
457 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1316 mateusz.vi 458 
  if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 459 
 
1327 mateusz.vi 460 
  cursor_left(db);
461 
  del(db);
1302 mateusz.vi 462 
}
463 
 
464 
 
1286 mateusz.vi 465 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
466 
 * of argc and argv, saves some 330 bytes of binary size */
467 
static char *parseargv(void) {
468 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
469 
  unsigned char count = 0;
470 
  char *argv[4];
471 
 
472 
  while (count < 4) {
473 
    /* jump to nearest arg */
474 
    while (*tail == ' ') {
475 
      *tail = 0;
476 
      tail++;
477 
    }
478 
 
479 
    if (*tail == '\r') {
480 
      *tail = 0;
481 
      break;
482 
    }
483 
 
484 
    argv[count++] = tail;
485 
 
486 
    /* jump to next delimiter */
487 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
488 
  }
489 
 
490 
  /* check args now */
1321 mateusz.vi 491 
  if (count == 0) return("");
1286 mateusz.vi 492 
 
493 
  return(argv[0]);
494 
}
495 
 
496 
 
1320 mateusz.vi 497 
static struct file *loadfile(const char *fname) {
1324 mateusz.vi 498 
  char buff[512]; /* read one entire sector at a time (faster) */
499 
  char *buffptr;
500 
  unsigned int len, llen;
1287 mateusz.vi 501 
  int fd;
1324 mateusz.vi 502 
  unsigned char eolfound;
1320 mateusz.vi 503 
  struct file *db;
1287 mateusz.vi 504 
 
1321 mateusz.vi 505 
  len = strlen(fname) + 1;
1332 mateusz.vi 506 
  db = calloc(1, sizeof(struct file));
1321 mateusz.vi 507 
  if (db == NULL) return(NULL);
508 
  memcpy(db->fname, fname, len);
509 
 
510 
  if (*fname == 0) goto SKIPLOADING;
511 
 
1287 mateusz.vi 512 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
513 
    mdr_coutraw_puts("Failed to open file:");
514 
    mdr_coutraw_puts(fname);
1321 mateusz.vi 515 
    free(db);
1320 mateusz.vi 516 
    return(NULL);
1287 mateusz.vi 517 
  }
518 
 
1313 mateusz.vi 519 
  db->lfonly = 1;
520 
 
1324 mateusz.vi 521 
  /* start by adding an empty line */
1328 mateusz.vi 522 
  if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 523 
    /* TODO ERROR HANDLING */
524 
  }
1287 mateusz.vi 525 
 
1324 mateusz.vi 526 
  for (eolfound = 0;;) {
527 
    unsigned short consumedbytes;
528 
 
529 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
530 
    buffptr = buff;
531 
 
532 
    FINDLINE:
533 
 
534 
    /* look for nearest \n */
535 
    for (consumedbytes = 0;; consumedbytes++) {
536 
      if (consumedbytes == len) {
537 
        llen = consumedbytes;
538 
        break;
1323 mateusz.vi 539 
      }
1324 mateusz.vi 540 
      if (buffptr[consumedbytes] == '\r') {
541 
        llen = consumedbytes;
542 
        consumedbytes++;
543 
        db->lfonly = 0;
1320 mateusz.vi 544 
        break;
545 
      }
1324 mateusz.vi 546 
      if (buffptr[consumedbytes] == '\n') {
547 
        eolfound = 1;
548 
        llen = consumedbytes;
549 
        consumedbytes++;
550 
        break;
551 
      }
1287 mateusz.vi 552 
    }
1324 mateusz.vi 553 
 
554 
    /* consumedbytes is the amount of bytes processed from buffptr,
555 
     * llen is the length of line's payload (without its line terminator) */
556 
 
557 
    /* append content, if line is non-empty */
558 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1287 mateusz.vi 559 
      mdr_coutraw_puts("out of memory");
1320 mateusz.vi 560 
      free(db);
561 
      db = NULL;
1287 mateusz.vi 562 
      break;
563 
    }
564 
 
1324 mateusz.vi 565 
    /* add a new line if necessary */
566 
    if (eolfound) {
1328 mateusz.vi 567 
      if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 568 
      /* TODO ERROR HANDLING */
569 
        mdr_coutraw_puts("out of memory");
570 
        free(db);
571 
        db = NULL;
572 
        break;
573 
      }
574 
      eolfound = 0;
575 
    }
1287 mateusz.vi 576 
 
1324 mateusz.vi 577 
    /* anything left? process the buffer leftover again */
578 
    if (consumedbytes < len) {
579 
      len -= consumedbytes;
580 
      buffptr += consumedbytes;
581 
      goto FINDLINE;
582 
    }
583 
 
584 
  }
585 
 
1287 mateusz.vi 586 
  _dos_close(fd);
587 
 
1321 mateusz.vi 588 
  SKIPLOADING:
589 
 
1320 mateusz.vi 590 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
591 
  if (db != NULL) {
1328 mateusz.vi 592 
    if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
1320 mateusz.vi 593 
    db_rewind(db);
594 
  }
595 
 
596 
  return(db);
1287 mateusz.vi 597 
}
598 
 
599 
 
1332 mateusz.vi 600 
static int savefile(const struct file *db, const char *newfname) {
1311 mateusz.vi 601 
  int fd;
602 
  const struct line far *l;
603 
  unsigned bytes;
1313 mateusz.vi 604 
  unsigned char eollen;
605 
  unsigned char eolbuf[2];
1332 mateusz.vi 606 
  int errflag = 0;
1313 mateusz.vi 607 
 
1332 mateusz.vi 608 
  /* either create a new file if newfname provided, or... */
609 
  if (newfname) {
610 
    if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
611 
  } else { /* ...open db->fname */
612 
    if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
1311 mateusz.vi 613 
  }
614 
 
615 
  l = db->cursor;
616 
  while (l->prev) l = l->prev;
617 
 
1313 mateusz.vi 618 
  /* preset line terminators */
619 
  if (db->lfonly) {
620 
    eolbuf[0] = '\n';
621 
    eollen = 1;
622 
  } else {
623 
    eolbuf[0] = '\r';
624 
    eolbuf[1] = '\n';
625 
    eollen = 2;
626 
  }
627 
 
1311 mateusz.vi 628 
  while (l) {
1324 mateusz.vi 629 
    /* do not write the last empty line, it is only useful for edition */
630 
    if (l->len != 0) {
1332 mateusz.vi 631 
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
1324 mateusz.vi 632 
    } else if (l->next == NULL) {
633 
      break;
634 
    }
1332 mateusz.vi 635 
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
1311 mateusz.vi 636 
    l = l->next;
637 
  }
638 
 
1332 mateusz.vi 639 
  errflag |= _dos_close(fd);
1330 mateusz.vi 640 
 
1332 mateusz.vi 641 
  return(errflag);
1311 mateusz.vi 642 
}
643 
 
644 
 
1327 mateusz.vi 645 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1317 mateusz.vi 646 
  struct line far *n;
647 
  n = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + len);
648 
  if (n != NULL) {
649 
    unsigned short off = db->xoffset + db->cursorposx;
1330 mateusz.vi 650 
    db->modflag = 1;
1317 mateusz.vi 651 
    if (n->prev) n->prev->next = n;
652 
    if (n->next) n->next->prev = n;
653 
    db->cursor = n;
654 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
655 
    db->cursor->len += len;
1327 mateusz.vi 656 
    uidirty.from = db->cursorposy;
657 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 658 
    while (len--) {
659 
      db->cursor->payload[off++] = *databuf;
660 
      databuf++;
1327 mateusz.vi 661 
      cursor_right(db);
1317 mateusz.vi 662 
    }
663 
  }
664 
}
665 
 
666 
 
1286 mateusz.vi 667 
int main(void) {
668 
  const char *fname;
1320 mateusz.vi 669 
  struct file *db;
1275 mateusz.vi 670 
 
1307 mateusz.vi 671 
  {
672 
    char nlspath[128], lang[8];
673 
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
674 
  }
1282 mateusz.vi 675 
 
1286 mateusz.vi 676 
  fname = parseargv();
677 
 
678 
  if (fname == NULL) {
1302 mateusz.vi 679 
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
1275 mateusz.vi 680 
    return(0);
681 
  }
682 
 
1282 mateusz.vi 683 
  /* load file */
1320 mateusz.vi 684 
  db = loadfile(fname);
685 
  if (db == NULL) return(1);
1282 mateusz.vi 686 
 
1333 mateusz.vi 687 
  if (mdr_cout_init(&screenw, &screenh)) {
688 
    /* load color scheme if mdr_cout_init returns a color flag */
689 
    SCHEME_TEXT = 0x17;
690 
    SCHEME_STBAR1 = 0x70;
691 
    SCHEME_STBAR2 = 0x78;
692 
    SCHEME_STBAR3 = 0xf0;
693 
    SCHEME_SCROLL = 0x70;
694 
    SCHEME_MSG = 0xf0;
695 
    SCHEME_ERR = 0x4f;
696 
  }
1326 mateusz.vi 697 
  ui_basic(db);
1275 mateusz.vi 698 
 
699 
  for (;;) {
700 
    int k;
701 
 
1327 mateusz.vi 702 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 703 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 704 
 
1327 mateusz.vi 705 
    if (uidirty.from != 0xff) {
706 
      ui_refresh(db);
707 
      uidirty.from = 0xff;
1282 mateusz.vi 708 
    }
1328 mateusz.vi 709 
#ifdef DBG_LINENUM
710 
      {
711 
        char ddd[10];
712 
        db->curline += 1;
713 
        ddd[0] = '0' + db->curline / 100;
714 
        ddd[1] = '0' + (db->curline % 100) / 10;
715 
        ddd[2] = '0' + (db->curline % 10);
716 
        db->curline -= 1;
717 
        ddd[3] = '/';
718 
        ddd[4] = '0' + db->totlines / 100;
719 
        ddd[5] = '0' + (db->totlines % 100) / 10;
720 
        ddd[6] = '0' + (db->totlines % 10);
721 
        ddd[7] = 0;
1333 mateusz.vi 722 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 723 
      }
724 
#endif
1275 mateusz.vi 725 
 
726 
    k = keyb_getkey();
1282 mateusz.vi 727 
 
1275 mateusz.vi 728 
    if (k == 0x150) { /* down */
1327 mateusz.vi 729 
      cursor_down(db);
1275 mateusz.vi 730 
 
731 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 732 
      cursor_up(db);
1275 mateusz.vi 733 
 
734 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 735 
      cursor_right(db);
1275 mateusz.vi 736 
 
737 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 738 
      cursor_left(db);
1275 mateusz.vi 739 
 
1282 mateusz.vi 740 
    } else if (k == 0x149) { /* pgup */
741 
      // TODO
742 
 
743 
    } else if (k == 0x151) { /* pgdown */
744 
      // TODO
745 
 
746 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 747 
       cursor_home(db);
1282 mateusz.vi 748 
 
749 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 750 
       cursor_eol(db);
1282 mateusz.vi 751 
 
1275 mateusz.vi 752 
    } else if (k == 0x1B) { /* ESC */
1331 mateusz.vi 753 
      if (db->modflag == 0) break;
754 
      /* if file has been modified then ask for confirmation */
1333 mateusz.vi 755 
      ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);
1331 mateusz.vi 756 
      if (keyb_getkey() == '\r') break;
1275 mateusz.vi 757 
 
1289 mateusz.vi 758 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 759 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 760 
      /* add a new line */
1328 mateusz.vi 761 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1330 mateusz.vi 762 
        db->modflag = 1;
1328 mateusz.vi 763 
        db->cursor = db->cursor->prev; /* back to original line */
764 
        db->curline -= 1;
1289 mateusz.vi 765 
        /* trim the line above */
1328 mateusz.vi 766 
        db->cursor->len = off;
1289 mateusz.vi 767 
        /* move cursor to the (new) line below */
1328 mateusz.vi 768 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 769 
        uidirty.to = 0xff;
1328 mateusz.vi 770 
        cursor_down(db);
771 
        cursor_home(db);
1289 mateusz.vi 772 
      } else {
773 
        /* ERROR: OUT OF MEMORY */
774 
      }
775 
 
1292 mateusz.vi 776 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 777 
      del(db);
1292 mateusz.vi 778 
 
1302 mateusz.vi 779 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 780 
      bkspc(db);
1302 mateusz.vi 781 
 
1308 mateusz.vi 782 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 783 
      char c = k;
1327 mateusz.vi 784 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 785 
 
1317 mateusz.vi 786 
    } else if (k == 0x009) { /* TAB */
787 
      const char *tab = "        ";
1327 mateusz.vi 788 
      insert_in_line(db, tab, 8);
1317 mateusz.vi 789 
 
1309 mateusz.vi 790 
    } else if (k == 0x13b) { /* F1 */
1326 mateusz.vi 791 
      ui_help();
1327 mateusz.vi 792 
      uidirty.from = 0;
793 
      uidirty.to = 0xff;
1309 mateusz.vi 794 
 
1332 mateusz.vi 795 
    } else if ((k == 0x13f) || (k == 0x140)) { /* F5 or F6 */
796 
      int saveres;
797 
 
798 
      if ((k == 0x140) || (db->fname[0] == 0)) { /* save as... */
799 
        char fname[25];
800 
        ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
801 
        if (*fname == 0) continue;
802 
        saveres = savefile(db, fname);
803 
        if (saveres == 0) memcpy(db->fname, fname, sizeof(fname));
804 
      } else {
805 
        saveres = savefile(db, NULL);
806 
      }
807 
 
808 
      if (saveres == 0) {
1330 mateusz.vi 809 
        db->modflag = 0;
1333 mateusz.vi 810 
        ui_msg(svarlang_str(0, 2), NULL, SCHEME_MSG);
1322 mateusz.vi 811 
        mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
812 
      } else {
1333 mateusz.vi 813 
        ui_msg(svarlang_str(0, 3), NULL, SCHEME_ERR);
1322 mateusz.vi 814 
        mdr_bios_tickswait(36); /* 2s */
815 
      }
1311 mateusz.vi 816 
 
1332 mateusz.vi 817 
      ui_basic(db);
818 
      ui_refresh(db);
819 
 
1314 mateusz.vi 820 
    } else if (k == 0x144) { /* F10 */
1330 mateusz.vi 821 
      db->modflag = 1;
1320 mateusz.vi 822 
      db->lfonly ^= 1;
1326 mateusz.vi 823 
      ui_basic(db);
1314 mateusz.vi 824 
 
1325 mateusz.vi 825 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
826 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
827 
      for (;;) {
828 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
829 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 830 
        cursor_right(db);
1325 mateusz.vi 831 
      }
832 
      /* now skip to next non-space or end of file */
833 
      for (;;) {
1327 mateusz.vi 834 
        cursor_right(db);
1325 mateusz.vi 835 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
836 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
837 
      }
838 
 
839 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 840 
      cursor_left(db);
1325 mateusz.vi 841 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
842 
      for (;;) {
843 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
844 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 845 
        cursor_left(db);
1325 mateusz.vi 846 
      }
847 
      /* now skip to next space or start of file */
848 
      for (;;) {
1327 mateusz.vi 849 
        cursor_left(db);
1325 mateusz.vi 850 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 851 
          cursor_right(db);
1325 mateusz.vi 852 
          break;
853 
        }
854 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
855 
      }
856 
 
1333 mateusz.vi 857 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 858 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
859 
      char buff[4];
860 
      const char *HEX = "0123456789ABCDEF";
861 
      buff[0] = HEX[(k >> 8) & 15];
862 
      buff[1] = HEX[(k >> 4) & 15];
863 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 864 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
865 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1275 mateusz.vi 866 
      keyb_getkey();
867 
      break;
1333 mateusz.vi 868 
#endif
1275 mateusz.vi 869 
    }
870 
  }
871 
 
872 
  mdr_cout_close();
873 
 
1320 mateusz.vi 874 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 875 
 
876 
  return(0);
877 
}