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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 
static unsigned char SCHEME_TEXT   = 0x07,
46 
                     SCHEME_STBAR1 = 0x70,
47 
                     SCHEME_STBAR2 = 0x70,
48 
                     SCHEME_STBAR3 = 0xf0,
49 
                     SCHEME_SCROLL = 0x70,
50 
                     SCHEME_MSG    = 0x70,
51 
                     SCHEME_ERR    = 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 */
1332 mateusz.vi 79 
  char fname[128];
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 
 
1332 mateusz.vi 112 
static void ui_getstring(const char *query, char *s, unsigned char maxlen) {
113 
  unsigned char len = 0, y, x;
114 
  int k;
115 
 
116 
  if (maxlen == 0) return;
117 
  maxlen--; /* make room for the nul terminator */
118 
 
119 
  y = screenh - 1;
120 
 
121 
  /* print query string */
1333 mateusz.vi 122 
  x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);
123 
  mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 124 
 
125 
  for (;;) {
126 
    mdr_cout_locate(y, x + len);
127 
    k = keyb_getkey();
128 
 
129 
    if (k == 0x1b) return; /* ESC */
130 
 
131 
    if (k == '\r') {
132 
      s[len] = 0;
133 
      return;
134 
    }
135 
 
136 
    if ((k == 0x08) && (len > 0)) { /* BKSPC */
137 
      len--;
1333 mateusz.vi 138 
      mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);
1332 mateusz.vi 139 
      continue;
140 
    }
141 
 
142 
    if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
1333 mateusz.vi 143 
      mdr_cout_char(y, x + len, k, SCHEME_STBAR3);
1332 mateusz.vi 144 
      s[len++] = k;
145 
    }
146 
 
147 
  }
148 
}
149 
 
150 
 
1324 mateusz.vi 151 
/* append a nul-terminated string to line at cursor position */
152 
static int line_append(struct file *f, const char far *buf, unsigned short len) {
153 
  struct line far *n;
154 
  if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */
155 
  n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);
156 
  if (n == NULL) return(-1);
157 
  f->cursor = n;
158 
  _fmemcpy(f->cursor->payload + f->cursor->len, buf, len);
159 
  f->cursor->len += len;
160 
 
161 
  /* rewire the linked list */
162 
  if (f->cursor->next) f->cursor->next->prev = f->cursor;
163 
  if (f->cursor->prev) f->cursor->prev->next = f->cursor;
164 
 
165 
  return(0);
166 
}
167 
 
168 
 
1315 mateusz.vi 169 
static void db_rewind(struct file *db) {
1275 mateusz.vi 170 
  if (db->cursor == NULL) return;
171 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 172 
  db->curline = 0;
1275 mateusz.vi 173 
}
174 
 
175 
 
1326 mateusz.vi 176 
static void ui_basic(const struct file *db) {
1302 mateusz.vi 177 
  const char *s = svarlang_strid(0); /* HELP */
1275 mateusz.vi 178 
  unsigned char helpcol = screenw - (strlen(s) + 4);
179 
 
1330 mateusz.vi 180 
  /* fill status bar with background (without modflag as it is refreshed by ui_refresh) */
1333 mateusz.vi 181 
  mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);
1313 mateusz.vi 182 
 
183 
  /* filename */
1330 mateusz.vi 184 
  {
185 
    const char *fn = db->fname;
186 
    if (*fn == 0) fn = svarlang_str(0, 1);
1333 mateusz.vi 187 
    mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);
1321 mateusz.vi 188 
  }
1313 mateusz.vi 189 
 
190 
  /* eol type */
1330 mateusz.vi 191 
  {
192 
    const char *eoltype = "CRLF";
193 
    if (db->lfonly) eoltype = "LF";
1333 mateusz.vi 194 
    mdr_cout_str(screenh - 1, helpcol - 5, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 195 
  }
1313 mateusz.vi 196 
 
1333 mateusz.vi 197 
  mdr_cout_str(screenh - 1, helpcol, " F1=", SCHEME_STBAR2, 40);
198 
  mdr_cout_str(screenh - 1, helpcol + 4, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 199 
}
200 
 
201 
 
1331 mateusz.vi 202 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
1312 mateusz.vi 203 
  unsigned short x, y, msglen, i;
1331 mateusz.vi 204 
  unsigned char msg2flag = 0;
205 
 
206 
  msglen = strlen(msg1);
207 
  if (msg2) {
208 
    msg2flag = 1;
209 
    i = strlen(msg2);
210 
    if (i > msglen) msglen = i;
211 
  }
212 
 
213 
  y = (screenh - 6) >> 1;
1312 mateusz.vi 214 
  x = (screenw - msglen - 4) >> 1;
1331 mateusz.vi 215 
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
216 
  x++;
217 
  mdr_cout_str(y+1, x, msg1, attr, msglen);
218 
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
1312 mateusz.vi 219 
 
1327 mateusz.vi 220 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 221 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 222 
}
223 
 
224 
 
1326 mateusz.vi 225 
static void ui_help(void) {
1309 mateusz.vi 226 
#define MAXLINLEN 35
1312 mateusz.vi 227 
  unsigned short i, offset;
1325 mateusz.vi 228 
  offset = (screenw - MAXLINLEN + 2) >> 1;
1309 mateusz.vi 229 
  mdr_cout_cursor_hide();
1325 mateusz.vi 230 
  for (i = 2; i <= 15; i++) {
1333 mateusz.vi 231 
    mdr_cout_char_rep(i, offset - 2, ' ', SCHEME_STBAR1, MAXLINLEN + 2);
1309 mateusz.vi 232 
  }
233 
 
1333 mateusz.vi 234 
  mdr_cout_str(3, offset, svarlang_str(0, 0), SCHEME_STBAR1, MAXLINLEN);
1325 mateusz.vi 235 
  for (i = 0; i <= 4; i++) {
1333 mateusz.vi 236 
    mdr_cout_str(5 + i, offset, svarlang_str(8, i), SCHEME_STBAR1, MAXLINLEN);
1309 mateusz.vi 237 
  }
1333 mateusz.vi 238 
  mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), SCHEME_STBAR1, MAXLINLEN);
1309 mateusz.vi 239 
 
1325 mateusz.vi 240 
  /* Press any key */
1333 mateusz.vi 241 
  mdr_cout_str(14, offset, svarlang_str(8, 11), SCHEME_STBAR1, MAXLINLEN);
1325 mateusz.vi 242 
 
1309 mateusz.vi 243 
  keyb_getkey();
244 
  mdr_cout_cursor_show();
245 
#undef MAXLINLEN
246 
}
247 
 
248 
 
1327 mateusz.vi 249 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 250 
  unsigned char x;
1310 mateusz.vi 251 
  const struct line far *l;
1316 mateusz.vi 252 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 253 
 
1288 mateusz.vi 254 
#ifdef DBG_REFRESH
1282 mateusz.vi 255 
  static char m = 'a';
256 
  m++;
257 
  if (m > 'z') m = 'a';
1288 mateusz.vi 258 
#endif
1282 mateusz.vi 259 
 
1310 mateusz.vi 260 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 261 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 262 
 
1310 mateusz.vi 263 
  /* iterate over lines and redraw whatever needs to be redrawn */
264 
  for (; l != NULL; l = l->next, y++) {
265 
 
266 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 267 
    if (y < uidirty.from) continue;
268 
    if (y > uidirty.to) break;
1282 mateusz.vi 269 
 
1318 mateusz.vi 270 
    x = 0;
1275 mateusz.vi 271 
    if (db->xoffset < l->len) {
1318 mateusz.vi 272 
      unsigned char i, limit;
273 
      if (l->len - db->xoffset < screenw) {
274 
        limit = l->len;
275 
      } else {
276 
        limit = db->xoffset + screenw - 1;
277 
      }
1333 mateusz.vi 278 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 279 
    }
1282 mateusz.vi 280 
 
1318 mateusz.vi 281 
    /* write empty spaces until end of line */
1333 mateusz.vi 282 
    if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);
1318 mateusz.vi 283 
 
1288 mateusz.vi 284 
#ifdef DBG_REFRESH
1333 mateusz.vi 285 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 286 
#endif
1282 mateusz.vi 287 
 
1275 mateusz.vi 288 
    if (y == screenh - 2) break;
289 
  }
1310 mateusz.vi 290 
 
1319 mateusz.vi 291 
  /* fill all lines below if empty (and they need to be redrawn) */
292 
  if (l == NULL) {
1327 mateusz.vi 293 
    while ((y < screenh - 1) && (y < uidirty.to)) {
1333 mateusz.vi 294 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);
1319 mateusz.vi 295 
    }
1318 mateusz.vi 296 
  }
1328 mateusz.vi 297 
 
1330 mateusz.vi 298 
  /* "file changed" flag */
299 
  {
300 
    char flg = ' ';
301 
    if (db->modflag) flg = '*';
1333 mateusz.vi 302 
    mdr_cout_char(screenh - 1, 0, flg, SCHEME_STBAR1);
1330 mateusz.vi 303 
  }
304 
 
1328 mateusz.vi 305 
  /* scroll bar */
306 
  for (y = 0; y < (screenh - 1); y++) {
1333 mateusz.vi 307 
    mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 308 
  }
309 
 
310 
  /* scroll cursor */
311 
  if (db->totlines >= screenh) {
312 
    unsigned short topline = db->curline - db->cursorposy;
313 
    unsigned short col;
314 
    unsigned short totlines = db->totlines - screenh + 1;
315 
    if (db->totlines - screenh > screenh) {
316 
      col = topline / (totlines / (screenh - 1));
317 
    } else {
318 
      col = topline * (screenh - 1) / totlines;
319 
    }
320 
    if (col >= screenh - 1) col = screenh - 2;
1333 mateusz.vi 321 
    mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);
1328 mateusz.vi 322 
  }
1275 mateusz.vi 323 
}
324 
 
325 
 
1327 mateusz.vi 326 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 327 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 328 
 
329 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 330 
    db->cursorposx = 0;
1275 mateusz.vi 331 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 332 
    uidirty.from = 0;
333 
    uidirty.to = 0xff;
1275 mateusz.vi 334 
  } else {
1316 mateusz.vi 335 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 336 
  }
337 
}
338 
 
339 
 
1327 mateusz.vi 340 
static void cursor_up(struct file *db) {
1275 mateusz.vi 341 
  if (db->cursor->prev != NULL) {
1328 mateusz.vi 342 
    db->curline -= 1;
1275 mateusz.vi 343 
    db->cursor = db->cursor->prev;
1316 mateusz.vi 344 
    if (db->cursorposy == 0) {
1327 mateusz.vi 345 
      uidirty.from = 0;
346 
      uidirty.to = 0xff;
1275 mateusz.vi 347 
    } else {
1316 mateusz.vi 348 
      db->cursorposy -= 1;
1275 mateusz.vi 349 
    }
350 
  }
351 
}
352 
 
353 
 
1327 mateusz.vi 354 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 355 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 356 
  if (db->xoffset > db->cursor->len) {
357 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 358 
    uidirty.from = 0;
359 
    uidirty.to = 0xff;
1282 mateusz.vi 360 
  }
361 
 
362 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
363 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 364 
    uidirty.from = 0;
365 
    uidirty.to = 0xff;
1282 mateusz.vi 366 
  }
1316 mateusz.vi 367 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 368 
}
369 
 
370 
 
1327 mateusz.vi 371 
static void cursor_down(struct file *db) {
1276 mateusz.vi 372 
  if (db->cursor->next != NULL) {
1328 mateusz.vi 373 
    db->curline += 1;
1276 mateusz.vi 374 
    db->cursor = db->cursor->next;
1316 mateusz.vi 375 
    if (db->cursorposy < screenh - 2) {
376 
      db->cursorposy += 1;
1276 mateusz.vi 377 
    } else {
1327 mateusz.vi 378 
      uidirty.from = 0;
379 
      uidirty.to = 0xff;
1276 mateusz.vi 380 
    }
381 
  }
382 
}
383 
 
384 
 
1327 mateusz.vi 385 
static void cursor_left(struct file *db) {
1316 mateusz.vi 386 
  if (db->cursorposx > 0) {
387 
    db->cursorposx -= 1;
1302 mateusz.vi 388 
  } else if (db->xoffset > 0) {
389 
    db->xoffset -= 1;
1327 mateusz.vi 390 
    uidirty.from = 0;
391 
    uidirty.to = 0xff;
1302 mateusz.vi 392 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 393 
    cursor_up(db);
394 
    cursor_eol(db);
1302 mateusz.vi 395 
  }
396 
}
397 
 
398 
 
1327 mateusz.vi 399 
static void cursor_home(struct file *db) {
1316 mateusz.vi 400 
  db->cursorposx = 0;
1282 mateusz.vi 401 
  if (db->xoffset != 0) {
402 
    db->xoffset = 0;
1327 mateusz.vi 403 
    uidirty.from = 0;
404 
    uidirty.to = 0xff;
1282 mateusz.vi 405 
  }
1276 mateusz.vi 406 
}
407 
 
408 
 
1327 mateusz.vi 409 
static void cursor_right(struct file *db) {
1316 mateusz.vi 410 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
411 
    if (db->cursorposx < screenw - 2) {
412 
      db->cursorposx += 1;
1308 mateusz.vi 413 
    } else {
414 
      db->xoffset += 1;
1327 mateusz.vi 415 
      uidirty.from = 0;
416 
      uidirty.to = 0xff;
1308 mateusz.vi 417 
    }
418 
  } else {
1327 mateusz.vi 419 
    cursor_down(db);
420 
    cursor_home(db);
1308 mateusz.vi 421 
  }
422 
}
423 
 
424 
 
1327 mateusz.vi 425 
static void del(struct file *db) {
1316 mateusz.vi 426 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
427 
    _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 428 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 429 
    uidirty.from = db->cursorposy;
430 
    uidirty.to = db->cursorposy;
1330 mateusz.vi 431 
    db->modflag = 1;
1292 mateusz.vi 432 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
433 
    struct line far *nextline = db->cursor->next;
434 
    if (db->cursor->next->len > 0) {
435 
      void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);
436 
      if (newptr != NULL) {
437 
        db->cursor = newptr;
438 
        _fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
439 
        db->cursor->len += db->cursor->next->len;
440 
      }
441 
    }
442 
    db->cursor->next = db->cursor->next->next;
443 
    db->cursor->next->prev = db->cursor;
444 
    if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
445 
    _ffree(nextline);
1327 mateusz.vi 446 
    uidirty.from = db->cursorposy;
447 
    uidirty.to = 0xff;
1328 mateusz.vi 448 
    db->totlines -= 1;
1330 mateusz.vi 449 
    db->modflag = 1;
1292 mateusz.vi 450 
  }
451 
}
452 
 
453 
 
1327 mateusz.vi 454 
static void bkspc(struct file *db) {
1302 mateusz.vi 455 
 
456 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1316 mateusz.vi 457 
  if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 458 
 
1327 mateusz.vi 459 
  cursor_left(db);
460 
  del(db);
1302 mateusz.vi 461 
}
462 
 
463 
 
1286 mateusz.vi 464 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
465 
 * of argc and argv, saves some 330 bytes of binary size */
466 
static char *parseargv(void) {
467 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
468 
  unsigned char count = 0;
469 
  char *argv[4];
470 
 
471 
  while (count < 4) {
472 
    /* jump to nearest arg */
473 
    while (*tail == ' ') {
474 
      *tail = 0;
475 
      tail++;
476 
    }
477 
 
478 
    if (*tail == '\r') {
479 
      *tail = 0;
480 
      break;
481 
    }
482 
 
483 
    argv[count++] = tail;
484 
 
485 
    /* jump to next delimiter */
486 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
487 
  }
488 
 
489 
  /* check args now */
1321 mateusz.vi 490 
  if (count == 0) return("");
1286 mateusz.vi 491 
 
492 
  return(argv[0]);
493 
}
494 
 
495 
 
1320 mateusz.vi 496 
static struct file *loadfile(const char *fname) {
1324 mateusz.vi 497 
  char buff[512]; /* read one entire sector at a time (faster) */
498 
  char *buffptr;
499 
  unsigned int len, llen;
1287 mateusz.vi 500 
  int fd;
1324 mateusz.vi 501 
  unsigned char eolfound;
1320 mateusz.vi 502 
  struct file *db;
1287 mateusz.vi 503 
 
1321 mateusz.vi 504 
  len = strlen(fname) + 1;
1332 mateusz.vi 505 
  db = calloc(1, sizeof(struct file));
1321 mateusz.vi 506 
  if (db == NULL) return(NULL);
507 
  memcpy(db->fname, fname, len);
508 
 
509 
  if (*fname == 0) goto SKIPLOADING;
510 
 
1287 mateusz.vi 511 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
512 
    mdr_coutraw_puts("Failed to open file:");
513 
    mdr_coutraw_puts(fname);
1321 mateusz.vi 514 
    free(db);
1320 mateusz.vi 515 
    return(NULL);
1287 mateusz.vi 516 
  }
517 
 
1313 mateusz.vi 518 
  db->lfonly = 1;
519 
 
1324 mateusz.vi 520 
  /* start by adding an empty line */
1328 mateusz.vi 521 
  if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 522 
    /* TODO ERROR HANDLING */
523 
  }
1287 mateusz.vi 524 
 
1324 mateusz.vi 525 
  for (eolfound = 0;;) {
526 
    unsigned short consumedbytes;
527 
 
528 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
529 
    buffptr = buff;
530 
 
531 
    FINDLINE:
532 
 
533 
    /* look for nearest \n */
534 
    for (consumedbytes = 0;; consumedbytes++) {
535 
      if (consumedbytes == len) {
536 
        llen = consumedbytes;
537 
        break;
1323 mateusz.vi 538 
      }
1324 mateusz.vi 539 
      if (buffptr[consumedbytes] == '\r') {
540 
        llen = consumedbytes;
541 
        consumedbytes++;
542 
        db->lfonly = 0;
1320 mateusz.vi 543 
        break;
544 
      }
1324 mateusz.vi 545 
      if (buffptr[consumedbytes] == '\n') {
546 
        eolfound = 1;
547 
        llen = consumedbytes;
548 
        consumedbytes++;
549 
        break;
550 
      }
1287 mateusz.vi 551 
    }
1324 mateusz.vi 552 
 
553 
    /* consumedbytes is the amount of bytes processed from buffptr,
554 
     * llen is the length of line's payload (without its line terminator) */
555 
 
556 
    /* append content, if line is non-empty */
557 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1287 mateusz.vi 558 
      mdr_coutraw_puts("out of memory");
1320 mateusz.vi 559 
      free(db);
560 
      db = NULL;
1287 mateusz.vi 561 
      break;
562 
    }
563 
 
1324 mateusz.vi 564 
    /* add a new line if necessary */
565 
    if (eolfound) {
1328 mateusz.vi 566 
      if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 567 
      /* TODO ERROR HANDLING */
568 
        mdr_coutraw_puts("out of memory");
569 
        free(db);
570 
        db = NULL;
571 
        break;
572 
      }
573 
      eolfound = 0;
574 
    }
1287 mateusz.vi 575 
 
1324 mateusz.vi 576 
    /* anything left? process the buffer leftover again */
577 
    if (consumedbytes < len) {
578 
      len -= consumedbytes;
579 
      buffptr += consumedbytes;
580 
      goto FINDLINE;
581 
    }
582 
 
583 
  }
584 
 
1287 mateusz.vi 585 
  _dos_close(fd);
586 
 
1321 mateusz.vi 587 
  SKIPLOADING:
588 
 
1320 mateusz.vi 589 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
590 
  if (db != NULL) {
1328 mateusz.vi 591 
    if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
1320 mateusz.vi 592 
    db_rewind(db);
593 
  }
594 
 
595 
  return(db);
1287 mateusz.vi 596 
}
597 
 
598 
 
1332 mateusz.vi 599 
static int savefile(const struct file *db, const char *newfname) {
1311 mateusz.vi 600 
  int fd;
601 
  const struct line far *l;
602 
  unsigned bytes;
1313 mateusz.vi 603 
  unsigned char eollen;
604 
  unsigned char eolbuf[2];
1332 mateusz.vi 605 
  int errflag = 0;
1313 mateusz.vi 606 
 
1332 mateusz.vi 607 
  /* either create a new file if newfname provided, or... */
608 
  if (newfname) {
609 
    if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
610 
  } else { /* ...open db->fname */
611 
    if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
1311 mateusz.vi 612 
  }
613 
 
614 
  l = db->cursor;
615 
  while (l->prev) l = l->prev;
616 
 
1313 mateusz.vi 617 
  /* preset line terminators */
618 
  if (db->lfonly) {
619 
    eolbuf[0] = '\n';
620 
    eollen = 1;
621 
  } else {
622 
    eolbuf[0] = '\r';
623 
    eolbuf[1] = '\n';
624 
    eollen = 2;
625 
  }
626 
 
1311 mateusz.vi 627 
  while (l) {
1324 mateusz.vi 628 
    /* do not write the last empty line, it is only useful for edition */
629 
    if (l->len != 0) {
1332 mateusz.vi 630 
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
1324 mateusz.vi 631 
    } else if (l->next == NULL) {
632 
      break;
633 
    }
1332 mateusz.vi 634 
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
1311 mateusz.vi 635 
    l = l->next;
636 
  }
637 
 
1332 mateusz.vi 638 
  errflag |= _dos_close(fd);
1330 mateusz.vi 639 
 
1332 mateusz.vi 640 
  return(errflag);
1311 mateusz.vi 641 
}
642 
 
643 
 
1327 mateusz.vi 644 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1317 mateusz.vi 645 
  struct line far *n;
646 
  n = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + len);
647 
  if (n != NULL) {
648 
    unsigned short off = db->xoffset + db->cursorposx;
1330 mateusz.vi 649 
    db->modflag = 1;
1317 mateusz.vi 650 
    if (n->prev) n->prev->next = n;
651 
    if (n->next) n->next->prev = n;
652 
    db->cursor = n;
653 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
654 
    db->cursor->len += len;
1327 mateusz.vi 655 
    uidirty.from = db->cursorposy;
656 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 657 
    while (len--) {
658 
      db->cursor->payload[off++] = *databuf;
659 
      databuf++;
1327 mateusz.vi 660 
      cursor_right(db);
1317 mateusz.vi 661 
    }
662 
  }
663 
}
664 
 
665 
 
1286 mateusz.vi 666 
int main(void) {
667 
  const char *fname;
1320 mateusz.vi 668 
  struct file *db;
1275 mateusz.vi 669 
 
1307 mateusz.vi 670 
  {
671 
    char nlspath[128], lang[8];
672 
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
673 
  }
1282 mateusz.vi 674 
 
1286 mateusz.vi 675 
  fname = parseargv();
676 
 
677 
  if (fname == NULL) {
1302 mateusz.vi 678 
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
1275 mateusz.vi 679 
    return(0);
680 
  }
681 
 
1282 mateusz.vi 682 
  /* load file */
1320 mateusz.vi 683 
  db = loadfile(fname);
684 
  if (db == NULL) return(1);
1282 mateusz.vi 685 
 
1333 mateusz.vi 686 
  if (mdr_cout_init(&screenw, &screenh)) {
687 
    /* load color scheme if mdr_cout_init returns a color flag */
688 
    SCHEME_TEXT = 0x17;
689 
    SCHEME_STBAR1 = 0x70;
690 
    SCHEME_STBAR2 = 0x78;
691 
    SCHEME_STBAR3 = 0xf0;
692 
    SCHEME_SCROLL = 0x70;
693 
    SCHEME_MSG = 0xf0;
694 
    SCHEME_ERR = 0x4f;
695 
  }
1326 mateusz.vi 696 
  ui_basic(db);
1275 mateusz.vi 697 
 
698 
  for (;;) {
699 
    int k;
700 
 
1327 mateusz.vi 701 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 702 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 703 
 
1327 mateusz.vi 704 
    if (uidirty.from != 0xff) {
705 
      ui_refresh(db);
706 
      uidirty.from = 0xff;
1282 mateusz.vi 707 
    }
1328 mateusz.vi 708 
#ifdef DBG_LINENUM
709 
      {
710 
        char ddd[10];
711 
        db->curline += 1;
712 
        ddd[0] = '0' + db->curline / 100;
713 
        ddd[1] = '0' + (db->curline % 100) / 10;
714 
        ddd[2] = '0' + (db->curline % 10);
715 
        db->curline -= 1;
716 
        ddd[3] = '/';
717 
        ddd[4] = '0' + db->totlines / 100;
718 
        ddd[5] = '0' + (db->totlines % 100) / 10;
719 
        ddd[6] = '0' + (db->totlines % 10);
720 
        ddd[7] = 0;
1333 mateusz.vi 721 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 722 
      }
723 
#endif
1275 mateusz.vi 724 
 
725 
    k = keyb_getkey();
1282 mateusz.vi 726 
 
1275 mateusz.vi 727 
    if (k == 0x150) { /* down */
1327 mateusz.vi 728 
      cursor_down(db);
1275 mateusz.vi 729 
 
730 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 731 
      cursor_up(db);
1275 mateusz.vi 732 
 
733 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 734 
      cursor_right(db);
1275 mateusz.vi 735 
 
736 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 737 
      cursor_left(db);
1275 mateusz.vi 738 
 
1282 mateusz.vi 739 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 740 
      unsigned char dist = db->cursorposy + screenh - 1;
741 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
742 
        db->cursor = db->cursor->prev;
743 
        dist--;
744 
      }
745 
      if (dist != 0) {
746 
        db->cursorposy = 0;
747 
        db->cursorposx = 0;
748 
      } else {
749 
        dist = db->cursorposy;
750 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
751 
      }
752 
      uidirty.from = 0;
753 
      uidirty.to = 0xff;
1282 mateusz.vi 754 
 
755 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 756 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
757 
      while ((dist != 0) && (db->cursor->next != NULL)) {
758 
        db->cursor = db->cursor->next;
759 
        dist--;
760 
      }
761 
      if (dist != 0) {
762 
        db->cursorposy = screenh - 2;
763 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
764 
        db->cursorposx = 0;
765 
      } else {
766 
        dist = screenh - 2 - db->cursorposy;
767 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
768 
      }
769 
      uidirty.from = 0;
770 
      uidirty.to = 0xff;
1282 mateusz.vi 771 
 
772 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 773 
       cursor_home(db);
1282 mateusz.vi 774 
 
775 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 776 
       cursor_eol(db);
1282 mateusz.vi 777 
 
1275 mateusz.vi 778 
    } else if (k == 0x1B) { /* ESC */
1331 mateusz.vi 779 
      if (db->modflag == 0) break;
780 
      /* if file has been modified then ask for confirmation */
1333 mateusz.vi 781 
      ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);
1331 mateusz.vi 782 
      if (keyb_getkey() == '\r') break;
1275 mateusz.vi 783 
 
1289 mateusz.vi 784 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 785 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 786 
      /* add a new line */
1328 mateusz.vi 787 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1330 mateusz.vi 788 
        db->modflag = 1;
1328 mateusz.vi 789 
        db->cursor = db->cursor->prev; /* back to original line */
790 
        db->curline -= 1;
1289 mateusz.vi 791 
        /* trim the line above */
1328 mateusz.vi 792 
        db->cursor->len = off;
1289 mateusz.vi 793 
        /* move cursor to the (new) line below */
1328 mateusz.vi 794 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 795 
        uidirty.to = 0xff;
1328 mateusz.vi 796 
        cursor_down(db);
797 
        cursor_home(db);
1289 mateusz.vi 798 
      } else {
799 
        /* ERROR: OUT OF MEMORY */
800 
      }
801 
 
1292 mateusz.vi 802 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 803 
      del(db);
1292 mateusz.vi 804 
 
1302 mateusz.vi 805 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 806 
      bkspc(db);
1302 mateusz.vi 807 
 
1308 mateusz.vi 808 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 809 
      char c = k;
1327 mateusz.vi 810 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 811 
 
1317 mateusz.vi 812 
    } else if (k == 0x009) { /* TAB */
813 
      const char *tab = "        ";
1327 mateusz.vi 814 
      insert_in_line(db, tab, 8);
1317 mateusz.vi 815 
 
1309 mateusz.vi 816 
    } else if (k == 0x13b) { /* F1 */
1326 mateusz.vi 817 
      ui_help();
1327 mateusz.vi 818 
      uidirty.from = 0;
819 
      uidirty.to = 0xff;
1309 mateusz.vi 820 
 
1332 mateusz.vi 821 
    } else if ((k == 0x13f) || (k == 0x140)) { /* F5 or F6 */
822 
      int saveres;
823 
 
824 
      if ((k == 0x140) || (db->fname[0] == 0)) { /* save as... */
825 
        char fname[25];
826 
        ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
827 
        if (*fname == 0) continue;
828 
        saveres = savefile(db, fname);
829 
        if (saveres == 0) memcpy(db->fname, fname, sizeof(fname));
830 
      } else {
831 
        saveres = savefile(db, NULL);
832 
      }
833 
 
834 
      if (saveres == 0) {
1330 mateusz.vi 835 
        db->modflag = 0;
1333 mateusz.vi 836 
        ui_msg(svarlang_str(0, 2), NULL, SCHEME_MSG);
1322 mateusz.vi 837 
        mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
838 
      } else {
1333 mateusz.vi 839 
        ui_msg(svarlang_str(0, 3), NULL, SCHEME_ERR);
1322 mateusz.vi 840 
        mdr_bios_tickswait(36); /* 2s */
841 
      }
1311 mateusz.vi 842 
 
1332 mateusz.vi 843 
      ui_basic(db);
844 
      ui_refresh(db);
845 
 
1314 mateusz.vi 846 
    } else if (k == 0x144) { /* F10 */
1330 mateusz.vi 847 
      db->modflag = 1;
1320 mateusz.vi 848 
      db->lfonly ^= 1;
1326 mateusz.vi 849 
      ui_basic(db);
1314 mateusz.vi 850 
 
1325 mateusz.vi 851 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
852 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
853 
      for (;;) {
854 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
855 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 856 
        cursor_right(db);
1325 mateusz.vi 857 
      }
858 
      /* now skip to next non-space or end of file */
859 
      for (;;) {
1327 mateusz.vi 860 
        cursor_right(db);
1325 mateusz.vi 861 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
862 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
863 
      }
864 
 
865 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 866 
      cursor_left(db);
1325 mateusz.vi 867 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
868 
      for (;;) {
869 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
870 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 871 
        cursor_left(db);
1325 mateusz.vi 872 
      }
873 
      /* now skip to next space or start of file */
874 
      for (;;) {
1327 mateusz.vi 875 
        cursor_left(db);
1325 mateusz.vi 876 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 877 
          cursor_right(db);
1325 mateusz.vi 878 
          break;
879 
        }
880 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
881 
      }
882 
 
1333 mateusz.vi 883 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 884 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
885 
      char buff[4];
886 
      const char *HEX = "0123456789ABCDEF";
887 
      buff[0] = HEX[(k >> 8) & 15];
888 
      buff[1] = HEX[(k >> 4) & 15];
889 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 890 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
891 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1275 mateusz.vi 892 
      keyb_getkey();
893 
      break;
1333 mateusz.vi 894 
#endif
1275 mateusz.vi 895 
    }
896 
  }
897 
 
898 
  mdr_cout_close();
899 
 
1320 mateusz.vi 900 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 901 
 
902 
  return(0);
903 
}