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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 
 
1338 mateusz.vi 26 
#include <dos.h>      /* _dos_open(), _dos_read(), _dos_close(), ... */
27 
#include <fcntl.h>    /* O_RDONLY, O_WRONLY */
1275 mateusz.vi 28 
#include <string.h>
29 
 
1312 mateusz.vi 30 
#include "mdr\bios.h"
1275 mateusz.vi 31 
#include "mdr\cout.h"
1307 mateusz.vi 32 
#include "mdr\dos.h"
1275 mateusz.vi 33 
#include "mdr\keyb.h"
34 
 
1282 mateusz.vi 35 
#include "svarlang\svarlang.h"
36 
 
1326 mateusz.vi 37 
 
1356 mateusz.vi 38 
#define PVER "2023.0"
39 
#define PDATE "2023"
40 
 
1326 mateusz.vi 41 
/*****************************************************************************
42 
 * global variables and definitions                                          *
43 
 *****************************************************************************/
44 
 
1275 mateusz.vi 45 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
1333 mateusz.vi 46 
static unsigned char SCHEME_TEXT   = 0x07,
1354 mateusz.vi 47 
                     SCHEME_MENU   = 0x70,
48 
                     SCHEME_MENU_CUR= 0x0f,
49 
                     SCHEME_MENU_SEL= 0x00,
1333 mateusz.vi 50 
                     SCHEME_STBAR1 = 0x70,
1358 mateusz.vi 51 
                     SCHEME_STBAR2 = 0x70, /* greyed out information */
52 
                     SCHEME_STBAR3 = 0x70, /* query */
1333 mateusz.vi 53 
                     SCHEME_SCROLL = 0x70,
54 
                     SCHEME_MSG    = 0x70,
1358 mateusz.vi 55 
                     SCHEME_ERR    = 0x70;
1327 mateusz.vi 56 
 
1326 mateusz.vi 57 
static unsigned char screenw, screenh;
1275 mateusz.vi 58 
 
1327 mateusz.vi 59 
static struct {
60 
    unsigned char from;
61 
    unsigned char to;
1342 mateusz.vi 62 
    unsigned char statusbar;
63 
} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */
1327 mateusz.vi 64 
 
1275 mateusz.vi 65 
#define SCROLL_CURSOR 0xB1
66 
 
67 
struct line {
1288 mateusz.vi 68 
  struct line far *prev;
69 
  struct line far *next;
1275 mateusz.vi 70 
  unsigned short len;
71 
  char payload[1];
72 
};
73 
 
1315 mateusz.vi 74 
struct file {
1288 mateusz.vi 75 
  struct line far *cursor;
1275 mateusz.vi 76 
  unsigned short xoffset;
1348 mateusz.vi 77 
  unsigned short cursorposx;
78 
  unsigned short cursorposy;
1328 mateusz.vi 79 
  unsigned short totlines;
80 
  unsigned short curline;
1330 mateusz.vi 81 
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
82 
  char modflag;  /* non-zero if file has been modified since last save */
1355 mateusz.vi 83 
  char modflagprev;
1332 mateusz.vi 84 
  char fname[128];
1275 mateusz.vi 85 
};
86 
 
87 
 
1326 mateusz.vi 88 
/*****************************************************************************
89 
 * functions                                                                 *
90 
 *****************************************************************************/
91 
 
1339 mateusz.vi 92 
static struct line far *line_calloc(unsigned short siz) {
1342 mateusz.vi 93 
  struct line far *res;
1339 mateusz.vi 94 
  unsigned int seg;
1341 mateusz.vi 95 
  if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);
1342 mateusz.vi 96 
  res = MK_FP(seg, 0);
97 
  _fmemset(res, 0, sizeof(struct line) + siz);
1339 mateusz.vi 98 
  return(MK_FP(seg, 0));
99 
}
100 
 
101 
 
102 
static void line_free(struct line far *ptr) {
103 
  _dos_freemem(FP_SEG(ptr));
104 
}
105 
 
106 
 
1348 mateusz.vi 107 
static int curline_resize(struct file far *db, unsigned short newsiz) {
1339 mateusz.vi 108 
  unsigned int maxavail;
109 
  struct line far *newptr;
110 
 
1341 mateusz.vi 111 
  /* try resizing the block (much faster) */
112 
  if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);
1339 mateusz.vi 113 
 
114 
  /* create a new block and copy data over */
115 
  newptr = line_calloc(newsiz);
1340 mateusz.vi 116 
  if (newptr == NULL) return(-1);
117 
  _fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
118 
 
119 
  /* rewire the linked list */
120 
  db->cursor = newptr;
121 
  if (newptr->next) newptr->next->prev = newptr;
122 
  if (newptr->prev) newptr->prev->next = newptr;
123 
 
124 
  return(0);
1339 mateusz.vi 125 
}
126 
 
127 
 
1328 mateusz.vi 128 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 129 
 * returns non-zero on error */
1328 mateusz.vi 130 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 131 
  struct line far *l;
1275 mateusz.vi 132 
 
1339 mateusz.vi 133 
  l = line_calloc(slen);
1287 mateusz.vi 134 
  if (l == NULL) return(-1);
135 
 
1275 mateusz.vi 136 
  l->prev = db->cursor;
137 
  if (db->cursor) {
138 
    l->next = db->cursor->next;
139 
    db->cursor->next = l;
140 
    l->next->prev = l;
141 
  }
142 
  db->cursor = l;
1342 mateusz.vi 143 
  if (slen > 0) {
144 
    _fmemmove(l->payload, line, slen);
145 
    l->len = slen;
146 
  }
1287 mateusz.vi 147 
 
1328 mateusz.vi 148 
  db->totlines += 1;
149 
  db->curline += 1;
150 
 
1287 mateusz.vi 151 
  return(0);
1275 mateusz.vi 152 
}
153 
 
154 
 
1348 mateusz.vi 155 
static void ui_getstring(const char *query, char *s, unsigned short maxlen) {
156 
  unsigned short len = 0;
157 
  unsigned char y, x;
1332 mateusz.vi 158 
  int k;
159 
 
160 
  if (maxlen == 0) return;
161 
  maxlen--; /* make room for the nul terminator */
162 
 
163 
  y = screenh - 1;
164 
 
165 
  /* print query string */
1333 mateusz.vi 166 
  x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);
167 
  mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 168 
 
169 
  for (;;) {
170 
    mdr_cout_locate(y, x + len);
171 
    k = keyb_getkey();
172 
 
1345 mateusz.vi 173 
    switch (k) {
174 
      case 0x1b: /* ESC */
175 
        s[0] = 0;
176 
        return;
177 
      case '\r':
178 
        s[len] = 0;
179 
        return;
180 
      case 0x08: /* BKSPC */
181 
        if (len > 0) {
182 
          len--;
183 
          mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);
184 
        }
185 
        break;
186 
      default:
187 
        if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
188 
          mdr_cout_char(y, x + len, k, SCHEME_STBAR3);
189 
          s[len++] = k;
190 
        }
1332 mateusz.vi 191 
    }
1345 mateusz.vi 192 
  }
1332 mateusz.vi 193 
 
194 
}
195 
 
196 
 
1324 mateusz.vi 197 
/* append a nul-terminated string to line at cursor position */
198 
static int line_append(struct file *f, const char far *buf, unsigned short len) {
199 
  if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */
1340 mateusz.vi 200 
  if (curline_resize(f, f->cursor->len + len) != 0) return(-1);
1337 mateusz.vi 201 
  _fmemmove(f->cursor->payload + f->cursor->len, buf, len);
1324 mateusz.vi 202 
  f->cursor->len += len;
203 
 
204 
  return(0);
205 
}
206 
 
207 
 
1315 mateusz.vi 208 
static void db_rewind(struct file *db) {
1275 mateusz.vi 209 
  if (db->cursor == NULL) return;
210 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 211 
  db->curline = 0;
1275 mateusz.vi 212 
}
213 
 
214 
 
1355 mateusz.vi 215 
static void ui_basic(const struct file *db, unsigned short slotnum) {
1356 mateusz.vi 216 
  const char *s = svarlang_strid(0); /* ESC=MENU */
1348 mateusz.vi 217 
  unsigned short helpcol = screenw - strlen(s);
1275 mateusz.vi 218 
 
1355 mateusz.vi 219 
  /* slot number */
220 
  {
221 
    char slot[4] = "#00";
222 
    slotnum++;
223 
    slot[1] += (slotnum / 10);
224 
    slot[2] += (slotnum % 10);
225 
    mdr_cout_str(screenh - 1, 0, slot, SCHEME_STBAR2, 3);
226 
  }
1313 mateusz.vi 227 
 
1355 mateusz.vi 228 
  /* fill rest of status bar with background */
229 
  mdr_cout_char_rep(screenh - 1, 3, ' ', SCHEME_STBAR1, screenw - 1);
230 
 
1313 mateusz.vi 231 
  /* filename */
1330 mateusz.vi 232 
  {
233 
    const char *fn = db->fname;
1355 mateusz.vi 234 
    unsigned short x;
1330 mateusz.vi 235 
    if (*fn == 0) fn = svarlang_str(0, 1);
1355 mateusz.vi 236 
    x = mdr_cout_str(screenh - 1, 4, fn, SCHEME_STBAR1, screenw);
237 
    if (db->modflag) mdr_cout_char(screenh - 1, 5 + x, '*', SCHEME_STBAR1);
1321 mateusz.vi 238 
  }
1313 mateusz.vi 239 
 
240 
  /* eol type */
1330 mateusz.vi 241 
  {
242 
    const char *eoltype = "CRLF";
1353 mateusz.vi 243 
    if (db->lfonly) eoltype += 2;
1335 mateusz.vi 244 
    mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 245 
  }
1313 mateusz.vi 246 
 
1335 mateusz.vi 247 
  mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 248 
}
249 
 
250 
 
1331 mateusz.vi 251 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
1312 mateusz.vi 252 
  unsigned short x, y, msglen, i;
1331 mateusz.vi 253 
  unsigned char msg2flag = 0;
254 
 
255 
  msglen = strlen(msg1);
256 
  if (msg2) {
257 
    msg2flag = 1;
258 
    i = strlen(msg2);
259 
    if (i > msglen) msglen = i;
260 
  }
261 
 
262 
  y = (screenh - 6) >> 1;
1312 mateusz.vi 263 
  x = (screenw - msglen - 4) >> 1;
1331 mateusz.vi 264 
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
265 
  x++;
1345 mateusz.vi 266 
 
1331 mateusz.vi 267 
  mdr_cout_str(y+1, x, msg1, attr, msglen);
268 
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
1312 mateusz.vi 269 
 
1327 mateusz.vi 270 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 271 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 272 
}
273 
 
274 
 
1342 mateusz.vi 275 
static unsigned char ui_confirm_if_unsaved(struct file *db) {
1355 mateusz.vi 276 
  unsigned char r = 0;
1342 mateusz.vi 277 
  if (db->modflag == 0) return(0);
278 
 
1355 mateusz.vi 279 
  mdr_cout_cursor_hide();
280 
 
1342 mateusz.vi 281 
  /* if file has been modified then ask for confirmation */
282 
  ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);
1355 mateusz.vi 283 
  if (keyb_getkey() != '\r') r = 1;
1342 mateusz.vi 284 
 
1355 mateusz.vi 285 
  mdr_cout_cursor_show();
286 
 
287 
  return(r);
1342 mateusz.vi 288 
}
289 
 
290 
 
1327 mateusz.vi 291 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 292 
  unsigned char x;
1310 mateusz.vi 293 
  const struct line far *l;
1316 mateusz.vi 294 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 295 
 
1392 mateusz.vi 296 
  /* quit early if nothing to refresh */
297 
  if (uidirty.from == 0xff) return;
298 
 
1288 mateusz.vi 299 
#ifdef DBG_REFRESH
1282 mateusz.vi 300 
  static char m = 'a';
301 
  m++;
302 
  if (m > 'z') m = 'a';
1288 mateusz.vi 303 
#endif
1282 mateusz.vi 304 
 
1310 mateusz.vi 305 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 306 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 307 
 
1310 mateusz.vi 308 
  /* iterate over lines and redraw whatever needs to be redrawn */
309 
  for (; l != NULL; l = l->next, y++) {
310 
 
311 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 312 
    if (y < uidirty.from) continue;
313 
    if (y > uidirty.to) break;
1282 mateusz.vi 314 
 
1318 mateusz.vi 315 
    x = 0;
1275 mateusz.vi 316 
    if (db->xoffset < l->len) {
1318 mateusz.vi 317 
      unsigned char i, limit;
318 
      if (l->len - db->xoffset < screenw) {
319 
        limit = l->len;
320 
      } else {
321 
        limit = db->xoffset + screenw - 1;
322 
      }
1333 mateusz.vi 323 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 324 
    }
1282 mateusz.vi 325 
 
1318 mateusz.vi 326 
    /* write empty spaces until end of line */
1333 mateusz.vi 327 
    if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);
1318 mateusz.vi 328 
 
1288 mateusz.vi 329 
#ifdef DBG_REFRESH
1333 mateusz.vi 330 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 331 
#endif
1282 mateusz.vi 332 
 
1275 mateusz.vi 333 
    if (y == screenh - 2) break;
334 
  }
1310 mateusz.vi 335 
 
1319 mateusz.vi 336 
  /* fill all lines below if empty (and they need to be redrawn) */
337 
  if (l == NULL) {
1327 mateusz.vi 338 
    while ((y < screenh - 1) && (y < uidirty.to)) {
1333 mateusz.vi 339 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);
1319 mateusz.vi 340 
    }
1318 mateusz.vi 341 
  }
1328 mateusz.vi 342 
 
343 
  /* scroll bar */
344 
  for (y = 0; y < (screenh - 1); y++) {
1333 mateusz.vi 345 
    mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 346 
  }
347 
 
348 
  /* scroll cursor */
349 
  if (db->totlines >= screenh) {
350 
    unsigned short topline = db->curline - db->cursorposy;
351 
    unsigned short col;
352 
    unsigned short totlines = db->totlines - screenh + 1;
353 
    if (db->totlines - screenh > screenh) {
354 
      col = topline / (totlines / (screenh - 1));
355 
    } else {
356 
      col = topline * (screenh - 1) / totlines;
357 
    }
358 
    if (col >= screenh - 1) col = screenh - 2;
1333 mateusz.vi 359 
    mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);
1328 mateusz.vi 360 
  }
1392 mateusz.vi 361 
 
362 
  /* clear out the dirty flag */
363 
  uidirty.from = 0xff;
1275 mateusz.vi 364 
}
365 
 
366 
 
1327 mateusz.vi 367 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 368 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 369 
 
370 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 371 
    db->cursorposx = 0;
1275 mateusz.vi 372 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 373 
    uidirty.from = 0;
374 
    uidirty.to = 0xff;
1275 mateusz.vi 375 
  } else {
1316 mateusz.vi 376 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 377 
  }
378 
}
379 
 
380 
 
1327 mateusz.vi 381 
static void cursor_up(struct file *db) {
1275 mateusz.vi 382 
  if (db->cursor->prev != NULL) {
1328 mateusz.vi 383 
    db->curline -= 1;
1275 mateusz.vi 384 
    db->cursor = db->cursor->prev;
1316 mateusz.vi 385 
    if (db->cursorposy == 0) {
1327 mateusz.vi 386 
      uidirty.from = 0;
387 
      uidirty.to = 0xff;
1275 mateusz.vi 388 
    } else {
1316 mateusz.vi 389 
      db->cursorposy -= 1;
1275 mateusz.vi 390 
    }
391 
  }
392 
}
393 
 
394 
 
1327 mateusz.vi 395 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 396 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 397 
  if (db->xoffset > db->cursor->len) {
398 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 399 
    uidirty.from = 0;
400 
    uidirty.to = 0xff;
1282 mateusz.vi 401 
  }
402 
 
403 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
404 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 405 
    uidirty.from = 0;
406 
    uidirty.to = 0xff;
1282 mateusz.vi 407 
  }
1316 mateusz.vi 408 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 409 
}
410 
 
411 
 
1327 mateusz.vi 412 
static void cursor_down(struct file *db) {
1276 mateusz.vi 413 
  if (db->cursor->next != NULL) {
1328 mateusz.vi 414 
    db->curline += 1;
1276 mateusz.vi 415 
    db->cursor = db->cursor->next;
1316 mateusz.vi 416 
    if (db->cursorposy < screenh - 2) {
417 
      db->cursorposy += 1;
1276 mateusz.vi 418 
    } else {
1327 mateusz.vi 419 
      uidirty.from = 0;
420 
      uidirty.to = 0xff;
1276 mateusz.vi 421 
    }
422 
  }
423 
}
424 
 
425 
 
1327 mateusz.vi 426 
static void cursor_left(struct file *db) {
1316 mateusz.vi 427 
  if (db->cursorposx > 0) {
428 
    db->cursorposx -= 1;
1302 mateusz.vi 429 
  } else if (db->xoffset > 0) {
430 
    db->xoffset -= 1;
1327 mateusz.vi 431 
    uidirty.from = 0;
432 
    uidirty.to = 0xff;
1302 mateusz.vi 433 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 434 
    cursor_up(db);
435 
    cursor_eol(db);
1302 mateusz.vi 436 
  }
437 
}
438 
 
439 
 
1327 mateusz.vi 440 
static void cursor_home(struct file *db) {
1316 mateusz.vi 441 
  db->cursorposx = 0;
1282 mateusz.vi 442 
  if (db->xoffset != 0) {
443 
    db->xoffset = 0;
1327 mateusz.vi 444 
    uidirty.from = 0;
445 
    uidirty.to = 0xff;
1282 mateusz.vi 446 
  }
1276 mateusz.vi 447 
}
448 
 
449 
 
1327 mateusz.vi 450 
static void cursor_right(struct file *db) {
1316 mateusz.vi 451 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
452 
    if (db->cursorposx < screenw - 2) {
453 
      db->cursorposx += 1;
1308 mateusz.vi 454 
    } else {
455 
      db->xoffset += 1;
1327 mateusz.vi 456 
      uidirty.from = 0;
457 
      uidirty.to = 0xff;
1308 mateusz.vi 458 
    }
1357 mateusz.vi 459 
  } else if (db->cursor->next != NULL) { /* jump to start of next line */
1327 mateusz.vi 460 
    cursor_down(db);
461 
    cursor_home(db);
1308 mateusz.vi 462 
  }
463 
}
464 
 
465 
 
1327 mateusz.vi 466 
static void del(struct file *db) {
1316 mateusz.vi 467 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
468 
    _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 469 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 470 
    uidirty.from = db->cursorposy;
471 
    uidirty.to = db->cursorposy;
1351 mateusz.vi 472 
    db->modflag = '*';
1292 mateusz.vi 473 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
474 
    struct line far *nextline = db->cursor->next;
475 
    if (db->cursor->next->len > 0) {
1340 mateusz.vi 476 
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
1337 mateusz.vi 477 
        _fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 478 
        db->cursor->len += db->cursor->next->len;
479 
      }
480 
    }
1340 mateusz.vi 481 
 
1292 mateusz.vi 482 
    db->cursor->next = db->cursor->next->next;
483 
    db->cursor->next->prev = db->cursor;
1340 mateusz.vi 484 
 
1339 mateusz.vi 485 
    line_free(nextline);
1327 mateusz.vi 486 
    uidirty.from = db->cursorposy;
487 
    uidirty.to = 0xff;
1328 mateusz.vi 488 
    db->totlines -= 1;
1351 mateusz.vi 489 
    db->modflag = '*';
1292 mateusz.vi 490 
  }
491 
}
492 
 
493 
 
1327 mateusz.vi 494 
static void bkspc(struct file *db) {
1302 mateusz.vi 495 
 
496 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1316 mateusz.vi 497 
  if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 498 
 
1327 mateusz.vi 499 
  cursor_left(db);
500 
  del(db);
1302 mateusz.vi 501 
}
502 
 
503 
 
1346 mateusz.vi 504 
/* returns 0 on success, 1 on file not found, 2 on other error */
1359 mateusz.vi 505 
static int loadfile(struct file *db, const char *fname) {
1324 mateusz.vi 506 
  char buff[512]; /* read one entire sector at a time (faster) */
507 
  char *buffptr;
508 
  unsigned int len, llen;
1287 mateusz.vi 509 
  int fd;
1324 mateusz.vi 510 
  unsigned char eolfound;
1287 mateusz.vi 511 
 
1355 mateusz.vi 512 
  /* free the entire linked list of lines */
513 
  db_rewind(db);
514 
  while (db->cursor) {
515 
    struct line far *victim;
516 
    victim = db->cursor;
517 
    db->cursor = db->cursor->next;
518 
    line_free(victim);
519 
  }
1321 mateusz.vi 520 
 
1355 mateusz.vi 521 
  /* zero out the struct */
522 
  bzero(db, sizeof(struct file));
523 
 
1321 mateusz.vi 524 
  if (*fname == 0) goto SKIPLOADING;
525 
 
1355 mateusz.vi 526 
  memcpy(db->fname, fname, strlen(fname));
527 
 
1287 mateusz.vi 528 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
1346 mateusz.vi 529 
    return(1);
1287 mateusz.vi 530 
  }
531 
 
1313 mateusz.vi 532 
  db->lfonly = 1;
533 
 
1324 mateusz.vi 534 
  /* start by adding an empty line */
1328 mateusz.vi 535 
  if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 536 
    /* TODO ERROR HANDLING */
537 
  }
1287 mateusz.vi 538 
 
1324 mateusz.vi 539 
  for (eolfound = 0;;) {
540 
    unsigned short consumedbytes;
541 
 
542 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
543 
    buffptr = buff;
544 
 
545 
    FINDLINE:
546 
 
1361 mateusz.vi 547 
    /* look for nearest \n (also expand tabs) */
1324 mateusz.vi 548 
    for (consumedbytes = 0;; consumedbytes++) {
1361 mateusz.vi 549 
 
550 
      if (buffptr[consumedbytes] == '\t') {
551 
        llen = consumedbytes;
552 
        break;
553 
      }
554 
 
1324 mateusz.vi 555 
      if (consumedbytes == len) {
556 
        llen = consumedbytes;
557 
        break;
1323 mateusz.vi 558 
      }
1324 mateusz.vi 559 
      if (buffptr[consumedbytes] == '\r') {
560 
        llen = consumedbytes;
561 
        consumedbytes++;
562 
        db->lfonly = 0;
1320 mateusz.vi 563 
        break;
564 
      }
1324 mateusz.vi 565 
      if (buffptr[consumedbytes] == '\n') {
566 
        eolfound = 1;
567 
        llen = consumedbytes;
568 
        consumedbytes++;
569 
        break;
570 
      }
1287 mateusz.vi 571 
    }
1324 mateusz.vi 572 
 
573 
    /* consumedbytes is the amount of bytes processed from buffptr,
574 
     * llen is the length of line's payload (without its line terminator) */
575 
 
576 
    /* append content, if line is non-empty */
577 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1339 mateusz.vi 578 
      goto IOERR;
1287 mateusz.vi 579 
    }
580 
 
1324 mateusz.vi 581 
    /* add a new line if necessary */
582 
    if (eolfound) {
1328 mateusz.vi 583 
      if (line_add(db, NULL, 0) != 0) {
1339 mateusz.vi 584 
        goto IOERR;
1324 mateusz.vi 585 
      }
586 
      eolfound = 0;
587 
    }
1287 mateusz.vi 588 
 
1361 mateusz.vi 589 
    /* append 8 spaces if tab char found */
590 
    if ((consumedbytes < len) && (buffptr[consumedbytes] == '\t')) {
591 
      consumedbytes++;
592 
      if (line_append(db, "        ", 8) != 0) {
593 
        goto IOERR;
594 
      }
595 
    }
596 
 
1324 mateusz.vi 597 
    /* anything left? process the buffer leftover again */
598 
    if (consumedbytes < len) {
599 
      len -= consumedbytes;
600 
      buffptr += consumedbytes;
601 
      goto FINDLINE;
602 
    }
603 
 
604 
  }
605 
 
1287 mateusz.vi 606 
  _dos_close(fd);
607 
 
1321 mateusz.vi 608 
  SKIPLOADING:
609 
 
1320 mateusz.vi 610 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
1339 mateusz.vi 611 
  if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
612 
  db_rewind(db);
1320 mateusz.vi 613 
 
1346 mateusz.vi 614 
  return(0);
1339 mateusz.vi 615 
 
616 
  IOERR:
617 
  _dos_close(fd);
1346 mateusz.vi 618 
  return(2);
1287 mateusz.vi 619 
}
620 
 
621 
 
1356 mateusz.vi 622 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
623 
 * of argc and argv, saves some 330 bytes of binary size
624 
 * returns non-zero on error */
625 
static int parseargv(struct file *dbarr) {
626 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
627 
  unsigned short count = 0;
628 
  char *arg;
629 
  unsigned short lastarg = 0;
1359 mateusz.vi 630 
  int err;
1356 mateusz.vi 631 
 
632 
  while (!lastarg) {
633 
    /* jump to nearest arg */
634 
    while (*tail == ' ') {
635 
      *tail = 0;
636 
      tail++;
637 
    }
638 
 
639 
    if (*tail == '\r') {
640 
      *tail = 0;
641 
      break;
642 
    }
643 
 
644 
    arg = tail;
645 
 
646 
    /* jump to next delimiter */
647 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
648 
 
649 
    /* if \r then remember this is the last arg */
650 
    if (*tail == '\r') lastarg = 1;
651 
 
652 
    *tail = 0;
653 
    tail++;
654 
 
655 
    /* look at the arg now */
656 
    if (*arg == '/') {
1387 mateusz.vi 657 
      const char far *self = mdr_dos_selfexe();
658 
      unsigned short i;
659 
      if (self == NULL) self = "sved";
660 
      for (i = 0; self[i] != 0; i++) {
661 
        if (self[i] == '\\') {
662 
          self += i + 1;
663 
          i = 0;
664 
        }
665 
      }
1390 mateusz.vi 666 
      mdr_coutraw_str(svarlang_str(1,3));
667 
      mdr_coutraw_str(" [");
668 
      mdr_coutraw_str(svarlang_str(1,4));
669 
      mdr_coutraw_puts(" " PVER "]");
670 
      mdr_coutraw_puts("Copyright (C) " PDATE " Mateusz Viste");
1387 mateusz.vi 671 
      mdr_coutraw_crlf();
672 
      mdr_coutraw_str(svarlang_str(1,0)); /* usage: */
673 
      mdr_coutraw_char(' ');
674 
      while (*self != 0) {
675 
        mdr_coutraw_char(*self);
676 
        self++;
677 
      }
678 
      mdr_coutraw_char(' ');
679 
      mdr_coutraw_puts(svarlang_str(1,1)); /* args syntax */
1356 mateusz.vi 680 
      return(-1);
681 
    }
682 
 
683 
    /* looks to be a filename */
684 
    if (count == 10) {
685 
      mdr_coutraw_puts(svarlang_str(0,12));
686 
      return(-1); /* too many files */
687 
    }
688 
 
689 
    /* try loading it */
1387 mateusz.vi 690 
    mdr_coutraw_str(svarlang_str(1,2));
691 
    mdr_coutraw_char(' ');
1356 mateusz.vi 692 
    mdr_coutraw_puts(arg);
693 
    err = loadfile(&(dbarr[count]), arg);
694 
    if (err) {
695 
      if (err == 1) { /* file not found */
696 
        err = 11;
697 
      } else { /* general error */
698 
        err = 10;
699 
      }
700 
      mdr_coutraw_puts(svarlang_str(0,err));
701 
      return(-1);
702 
    }
703 
    count++;
704 
  }
705 
 
706 
  return(0);
707 
}
708 
 
709 
 
1332 mateusz.vi 710 
static int savefile(const struct file *db, const char *newfname) {
1311 mateusz.vi 711 
  int fd;
712 
  const struct line far *l;
713 
  unsigned bytes;
1313 mateusz.vi 714 
  unsigned char eollen;
715 
  unsigned char eolbuf[2];
1332 mateusz.vi 716 
  int errflag = 0;
1313 mateusz.vi 717 
 
1332 mateusz.vi 718 
  /* either create a new file if newfname provided, or... */
719 
  if (newfname) {
720 
    if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
721 
  } else { /* ...open db->fname */
722 
    if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
1311 mateusz.vi 723 
  }
724 
 
725 
  l = db->cursor;
726 
  while (l->prev) l = l->prev;
727 
 
1313 mateusz.vi 728 
  /* preset line terminators */
729 
  if (db->lfonly) {
730 
    eolbuf[0] = '\n';
731 
    eollen = 1;
732 
  } else {
733 
    eolbuf[0] = '\r';
734 
    eolbuf[1] = '\n';
735 
    eollen = 2;
736 
  }
737 
 
1311 mateusz.vi 738 
  while (l) {
1324 mateusz.vi 739 
    /* do not write the last empty line, it is only useful for edition */
740 
    if (l->len != 0) {
1332 mateusz.vi 741 
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
1324 mateusz.vi 742 
    } else if (l->next == NULL) {
743 
      break;
744 
    }
1332 mateusz.vi 745 
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
1311 mateusz.vi 746 
    l = l->next;
747 
  }
748 
 
1332 mateusz.vi 749 
  errflag |= _dos_close(fd);
1330 mateusz.vi 750 
 
1332 mateusz.vi 751 
  return(errflag);
1311 mateusz.vi 752 
}
753 
 
754 
 
1327 mateusz.vi 755 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1340 mateusz.vi 756 
  if (curline_resize(db, db->cursor->len + len) == 0) {
1317 mateusz.vi 757 
    unsigned short off = db->xoffset + db->cursorposx;
1351 mateusz.vi 758 
    db->modflag = '*';
1317 mateusz.vi 759 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
760 
    db->cursor->len += len;
1327 mateusz.vi 761 
    uidirty.from = db->cursorposy;
762 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 763 
    while (len--) {
764 
      db->cursor->payload[off++] = *databuf;
765 
      databuf++;
1327 mateusz.vi 766 
      cursor_right(db);
1317 mateusz.vi 767 
    }
768 
  }
769 
}
770 
 
771 
 
1343 mateusz.vi 772 
/* recompute db->curline by counting nodes in linked list */
773 
static void recompute_curline(struct file *db) {
774 
  const struct line far *l = db->cursor;
775 
 
776 
  db->curline = 0;
777 
  while (l->prev != NULL) {
778 
    db->curline += 1;
779 
    l = l->prev;
780 
  }
781 
}
782 
 
783 
 
1354 mateusz.vi 784 
enum MENU_ACTION {
1363 mateusz.vi 785 
  MENU_OPEN   = 0,
786 
  MENU_SAVE   = 1,
787 
  MENU_SAVEAS = 2,
788 
  MENU_CLOSE  = 3,
789 
  MENU_CHGEOL = 4,
790 
  MENU_QUIT   = 5,
791 
  MENU_NONE   = 0xff
1354 mateusz.vi 792 
};
793 
 
794 
static enum MENU_ACTION ui_menu(void) {
795 
  unsigned short i, curchoice, attr, x, slen;
796 
  uidirty.from = 0;
797 
  uidirty.to = 0xff;
798 
  uidirty.statusbar = 1;
799 
 
800 
  /* find out the longest string */
801 
  slen = 0;
1355 mateusz.vi 802 
  for (i = MENU_OPEN; i <= MENU_QUIT; i++) {
1354 mateusz.vi 803 
    x = strlen(svarlang_str(8, i));
804 
    if (x > slen) slen = x;
805 
  }
806 
 
1355 mateusz.vi 807 
  curchoice = MENU_OPEN;
1354 mateusz.vi 808 
  for (;;) {
809 
    /* render menu */
1363 mateusz.vi 810 
    for (i = MENU_OPEN; i <= MENU_QUIT + 1; i++) {
811 
      mdr_cout_char_rep(i, 0, ' ', SCHEME_MENU, slen+3);
1354 mateusz.vi 812 
      if (i == curchoice) {
813 
        attr = SCHEME_MENU_CUR;
1363 mateusz.vi 814 
        mdr_cout_char(i, 0, '>', SCHEME_MENU_SEL);
1354 mateusz.vi 815 
      } else {
816 
        attr = SCHEME_MENU;
817 
      }
1363 mateusz.vi 818 
      x = mdr_cout_str(i, 1, svarlang_str(8, i), attr, slen);
1354 mateusz.vi 819 
      if (i == curchoice) {
1363 mateusz.vi 820 
        mdr_cout_char_rep(i, x + 1, ' ', SCHEME_MENU_SEL, slen - x + 1);
821 
        mdr_cout_locate(i, x + 1);
1354 mateusz.vi 822 
      }
823 
    }
824 
    /* wait for key */
825 
    switch (keyb_getkey()) {
826 
      case '\r': return(curchoice); /* ENTER */
827 
      case 0x150: /* down */
828 
        if (curchoice == MENU_QUIT) {
1355 mateusz.vi 829 
          curchoice = MENU_OPEN;
1354 mateusz.vi 830 
        } else {
831 
          curchoice++;
832 
        }
833 
        break;
834 
      case 0x148: /* up */
1355 mateusz.vi 835 
        if (curchoice == MENU_OPEN) {
1354 mateusz.vi 836 
          curchoice = MENU_QUIT;
837 
        } else {
838 
          curchoice--;
839 
        }
840 
        break;
841 
      default: return(MENU_NONE);
842 
    }
843 
  }
844 
}
845 
 
846 
 
1355 mateusz.vi 847 
static struct file *select_slot(struct file *dbarr, unsigned short curfile) {
848 
  uidirty.from = 0;
849 
  uidirty.to = 0xff;
850 
  uidirty.statusbar = 1;
851 
 
852 
  dbarr = &(dbarr[curfile]);
853 
  ui_basic(dbarr, curfile);
854 
  ui_refresh(dbarr);
855 
  return(dbarr);
856 
}
857 
 
858 
 
1347 mateusz.vi 859 
/* main returns nothing, ie. sved always exits with a zero exit code
860 
 * (this saves 20 bytes of executable footprint) */
861 
void main(void) {
1355 mateusz.vi 862 
  static struct file dbarr[10];
863 
  unsigned short curfile;
864 
  struct file *db = dbarr; /* visible file is the first slot by default */
1275 mateusz.vi 865 
 
1307 mateusz.vi 866 
  {
1364 mateusz.vi 867 
    unsigned short i = 0;
868 
    const char far *selfptr;
869 
    char self[128], lang[8];
870 
    selfptr = mdr_dos_selfexe();
871 
    if (selfptr != NULL) {
872 
      do {
873 
        self[i] = selfptr[i];
874 
      } while (self[i++] != 0);
875 
      svarlang_autoload_exepath(self, mdr_dos_getenv(lang, "LANG", sizeof(lang)));
876 
    }
1307 mateusz.vi 877 
  }
1282 mateusz.vi 878 
 
1355 mateusz.vi 879 
  /* preload all slots with empty files */
880 
  for (curfile = 9;; curfile--) {
881 
    loadfile(&(dbarr[curfile]), "");
882 
    if (curfile == 0) break;
883 
  }
884 
 
1356 mateusz.vi 885 
  /* parse argv (and load files, if any passed on) */
886 
  if (parseargv(dbarr) != 0) return;
1282 mateusz.vi 887 
 
1333 mateusz.vi 888 
  if (mdr_cout_init(&screenw, &screenh)) {
889 
    /* load color scheme if mdr_cout_init returns a color flag */
890 
    SCHEME_TEXT = 0x17;
1354 mateusz.vi 891 
    SCHEME_MENU = 0x70;
1388 mateusz.vi 892 
    SCHEME_MENU_CUR = 0x6f;
893 
    SCHEME_MENU_SEL = 0x66;
1333 mateusz.vi 894 
    SCHEME_STBAR1 = 0x70;
895 
    SCHEME_STBAR2 = 0x78;
1392 mateusz.vi 896 
    SCHEME_STBAR3 = 0x3f;
1333 mateusz.vi 897 
    SCHEME_SCROLL = 0x70;
1388 mateusz.vi 898 
    SCHEME_MSG = 0x6f;
1333 mateusz.vi 899 
    SCHEME_ERR = 0x4f;
900 
  }
1275 mateusz.vi 901 
 
902 
  for (;;) {
903 
    int k;
904 
 
1362 mateusz.vi 905 
    /* add an extra empty line if cursor is on last line and this line is not empty */
906 
    if ((db->cursor->next == NULL) && (db->cursor->len != 0)) {
907 
      if (line_add(db, NULL, 0) == 0) {
908 
        db->cursor = db->cursor->prev; /* line_add() changes the cursor pointer */
909 
      }
910 
    }
911 
 
1327 mateusz.vi 912 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 913 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 914 
 
1392 mateusz.vi 915 
    ui_refresh(db);
916 
 
1355 mateusz.vi 917 
    if ((uidirty.statusbar != 0) || (db->modflagprev != db->modflag)) {
918 
      ui_basic(db, curfile);
1342 mateusz.vi 919 
      uidirty.statusbar = 0;
1355 mateusz.vi 920 
      db->modflagprev = db->modflag;
1342 mateusz.vi 921 
    }
1328 mateusz.vi 922 
#ifdef DBG_LINENUM
923 
      {
924 
        char ddd[10];
925 
        db->curline += 1;
926 
        ddd[0] = '0' + db->curline / 100;
927 
        ddd[1] = '0' + (db->curline % 100) / 10;
928 
        ddd[2] = '0' + (db->curline % 10);
929 
        db->curline -= 1;
930 
        ddd[3] = '/';
931 
        ddd[4] = '0' + db->totlines / 100;
932 
        ddd[5] = '0' + (db->totlines % 100) / 10;
933 
        ddd[6] = '0' + (db->totlines % 10);
934 
        ddd[7] = 0;
1333 mateusz.vi 935 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 936 
      }
937 
#endif
1275 mateusz.vi 938 
 
939 
    k = keyb_getkey();
1282 mateusz.vi 940 
 
1275 mateusz.vi 941 
    if (k == 0x150) { /* down */
1327 mateusz.vi 942 
      cursor_down(db);
1275 mateusz.vi 943 
 
944 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 945 
      cursor_up(db);
1275 mateusz.vi 946 
 
947 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 948 
      cursor_right(db);
1275 mateusz.vi 949 
 
950 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 951 
      cursor_left(db);
1275 mateusz.vi 952 
 
1282 mateusz.vi 953 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 954 
      unsigned char dist = db->cursorposy + screenh - 1;
955 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
956 
        db->cursor = db->cursor->prev;
957 
        dist--;
958 
      }
959 
      if (dist != 0) {
960 
        db->cursorposy = 0;
961 
        db->cursorposx = 0;
962 
      } else {
963 
        dist = db->cursorposy;
964 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
965 
      }
966 
      uidirty.from = 0;
967 
      uidirty.to = 0xff;
1343 mateusz.vi 968 
      recompute_curline(db);
1282 mateusz.vi 969 
 
970 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 971 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
972 
      while ((dist != 0) && (db->cursor->next != NULL)) {
973 
        db->cursor = db->cursor->next;
974 
        dist--;
975 
      }
976 
      if (dist != 0) {
977 
        db->cursorposy = screenh - 2;
978 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
979 
        db->cursorposx = 0;
980 
      } else {
981 
        dist = screenh - 2 - db->cursorposy;
982 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
983 
      }
984 
      uidirty.from = 0;
985 
      uidirty.to = 0xff;
1343 mateusz.vi 986 
      recompute_curline(db);
1282 mateusz.vi 987 
 
988 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 989 
       cursor_home(db);
1282 mateusz.vi 990 
 
991 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 992 
       cursor_eol(db);
1282 mateusz.vi 993 
 
1275 mateusz.vi 994 
    } else if (k == 0x1B) { /* ESC */
1354 mateusz.vi 995 
      int quitnow = 0;
996 
      char fname[25];
997 
      int saveflag = 0;
1392 mateusz.vi 998 
      unsigned short ui_action;
1275 mateusz.vi 999 
 
1392 mateusz.vi 1000 
      /* collect the exact menu action and clear the screen */
1001 
      ui_action = ui_menu();
1002 
      ui_refresh(db);
1354 mateusz.vi 1003 
 
1392 mateusz.vi 1004 
      switch (ui_action) {
1005 
 
1354 mateusz.vi 1006 
        case MENU_NONE:
1007 
          break;
1008 
 
1009 
        case MENU_OPEN:
1010 
          /* display a warning if unsaved changes are pending */
1011 
          if (db->modflag != 0) ui_msg(svarlang_str(0,4), svarlang_str(0,8), SCHEME_MSG);
1012 
 
1013 
          /* ask for filename */
1014 
          ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
1015 
          if (fname[0] != 0) {
1359 mateusz.vi 1016 
            int err;
1354 mateusz.vi 1017 
            err = loadfile(db, fname);
1018 
            if (err != 0) {
1019 
              if (err == 1) {
1020 
                ui_msg(svarlang_str(0,11), NULL, SCHEME_ERR); /* file not found */
1021 
              } else {
1022 
                ui_msg(svarlang_str(0,10), NULL, SCHEME_ERR);  /* ERROR */
1023 
              }
1024 
              mdr_bios_tickswait(44); /* 3s */
1355 mateusz.vi 1025 
              loadfile(db, "");
1354 mateusz.vi 1026 
            }
1027 
          }
1028 
          break;
1029 
 
1030 
        case MENU_SAVEAS:
1031 
          saveflag = 1;
1032 
          /* FALLTHRU */
1033 
        case MENU_SAVE:
1034 
          if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
1035 
            ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
1036 
            if (*fname == 0) break;
1037 
            saveflag = savefile(db, fname);
1038 
            if (saveflag == 0) memcpy(db->fname, fname, sizeof(fname));
1039 
          } else {
1040 
            saveflag = savefile(db, NULL);
1041 
          }
1042 
 
1043 
          if (saveflag == 0) {
1044 
            db->modflag = 0;
1045 
            ui_msg(svarlang_str(0, 2), NULL, SCHEME_MSG);
1046 
            mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
1047 
          } else {
1048 
            ui_msg(svarlang_str(0, 3), NULL, SCHEME_ERR);
1049 
            mdr_bios_tickswait(36); /* 2s */
1050 
          }
1051 
          break;
1052 
 
1355 mateusz.vi 1053 
        case MENU_CLOSE:
1054 
          if (ui_confirm_if_unsaved(db) == 0) {
1055 
            loadfile(db, "");
1056 
          }
1057 
          uidirty.from = 0;
1058 
          uidirty.to = 0xff;
1059 
          uidirty.statusbar = 1;
1060 
          break;
1061 
 
1354 mateusz.vi 1062 
        case MENU_CHGEOL:
1063 
          db->modflag = '*';
1064 
          db->lfonly ^= 1;
1065 
          break;
1066 
 
1067 
        case MENU_QUIT:
1355 mateusz.vi 1068 
          quitnow = 1;
1069 
          for (curfile = 0; curfile < 10; curfile++) {
1070 
            if (dbarr[curfile].modflag) {
1071 
              db = select_slot(dbarr, curfile);
1072 
              if (ui_confirm_if_unsaved(db) != 0) quitnow = 0;
1073 
            }
1074 
          }
1354 mateusz.vi 1075 
          break;
1076 
      }
1077 
 
1078 
      if (quitnow) break;
1079 
 
1289 mateusz.vi 1080 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 1081 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 1082 
      /* add a new line */
1328 mateusz.vi 1083 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1351 mateusz.vi 1084 
        db->modflag = '*';
1328 mateusz.vi 1085 
        db->cursor = db->cursor->prev; /* back to original line */
1289 mateusz.vi 1086 
        /* trim the line above */
1328 mateusz.vi 1087 
        db->cursor->len = off;
1289 mateusz.vi 1088 
        /* move cursor to the (new) line below */
1343 mateusz.vi 1089 
        db->curline -= 1;
1328 mateusz.vi 1090 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 1091 
        uidirty.to = 0xff;
1328 mateusz.vi 1092 
        cursor_down(db);
1093 
        cursor_home(db);
1289 mateusz.vi 1094 
      } else {
1095 
        /* ERROR: OUT OF MEMORY */
1096 
      }
1097 
 
1292 mateusz.vi 1098 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 1099 
      del(db);
1292 mateusz.vi 1100 
 
1302 mateusz.vi 1101 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 1102 
      bkspc(db);
1302 mateusz.vi 1103 
 
1308 mateusz.vi 1104 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 1105 
      char c = k;
1327 mateusz.vi 1106 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 1107 
 
1317 mateusz.vi 1108 
    } else if (k == 0x009) { /* TAB */
1348 mateusz.vi 1109 
      insert_in_line(db, "        ", 8);
1317 mateusz.vi 1110 
 
1355 mateusz.vi 1111 
    } else if ((k >= 0x13b) && (k <= 0x144)) { /* F1..F10 */
1112 
      curfile = k - 0x13b;
1113 
      db = select_slot(dbarr, curfile);
1309 mateusz.vi 1114 
 
1325 mateusz.vi 1115 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
1116 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
1117 
      for (;;) {
1118 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
1119 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 1120 
        cursor_right(db);
1325 mateusz.vi 1121 
      }
1122 
      /* now skip to next non-space or end of file */
1123 
      for (;;) {
1327 mateusz.vi 1124 
        cursor_right(db);
1325 mateusz.vi 1125 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1126 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
1127 
      }
1128 
 
1129 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 1130 
      cursor_left(db);
1325 mateusz.vi 1131 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
1132 
      for (;;) {
1133 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
1134 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 1135 
        cursor_left(db);
1325 mateusz.vi 1136 
      }
1137 
      /* now skip to next space or start of file */
1138 
      for (;;) {
1327 mateusz.vi 1139 
        cursor_left(db);
1325 mateusz.vi 1140 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 1141 
          cursor_right(db);
1325 mateusz.vi 1142 
          break;
1143 
        }
1144 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
1145 
      }
1146 
 
1333 mateusz.vi 1147 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 1148 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
1149 
      char buff[4];
1150 
      const char *HEX = "0123456789ABCDEF";
1151 
      buff[0] = HEX[(k >> 8) & 15];
1152 
      buff[1] = HEX[(k >> 4) & 15];
1153 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 1154 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
1155 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1275 mateusz.vi 1156 
      keyb_getkey();
1157 
      break;
1333 mateusz.vi 1158 
#endif
1275 mateusz.vi 1159 
    }
1160 
  }
1161 
 
1162 
  mdr_cout_close();
1163 
 
1320 mateusz.vi 1164 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 1165 
 
1347 mateusz.vi 1166 
  return;
1275 mateusz.vi 1167 
}