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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);
1394 mateusz.vi 218 
  unsigned short maxfnlen = helpcol - 14;
1275 mateusz.vi 219 
 
1355 mateusz.vi 220 
  /* slot number */
221 
  {
222 
    char slot[4] = "#00";
223 
    slotnum++;
224 
    slot[1] += (slotnum / 10);
225 
    slot[2] += (slotnum % 10);
226 
    mdr_cout_str(screenh - 1, 0, slot, SCHEME_STBAR2, 3);
227 
  }
1313 mateusz.vi 228 
 
1355 mateusz.vi 229 
  /* fill rest of status bar with background */
230 
  mdr_cout_char_rep(screenh - 1, 3, ' ', SCHEME_STBAR1, screenw - 1);
231 
 
1393 mateusz.vi 232 
  /* filename and modflag */
1330 mateusz.vi 233 
  {
1394 mateusz.vi 234 
    const char *fn;
1355 mateusz.vi 235 
    unsigned short x;
1394 mateusz.vi 236 
    if (db->fname[0] == 0) {
237 
      fn = svarlang_str(0, 1); /* "UNTITLED" */
238 
    } else {
239 
      /* display filename up to maxfnlen chars */
240 
      fn = db->fname;
241 
      x = strlen(fn);
242 
      if (x > maxfnlen) fn += x - maxfnlen;
243 
    }
244 
    x = mdr_cout_str(screenh - 1, 4, fn, SCHEME_STBAR1, maxfnlen);
1393 mateusz.vi 245 
    if (db->modflag) mdr_cout_char(screenh - 1, 5 + x, '!', SCHEME_STBAR2);
1321 mateusz.vi 246 
  }
1313 mateusz.vi 247 
 
248 
  /* eol type */
1330 mateusz.vi 249 
  {
250 
    const char *eoltype = "CRLF";
1353 mateusz.vi 251 
    if (db->lfonly) eoltype += 2;
1335 mateusz.vi 252 
    mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 253 
  }
1313 mateusz.vi 254 
 
1335 mateusz.vi 255 
  mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 256 
}
257 
 
258 
 
1331 mateusz.vi 259 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
1312 mateusz.vi 260 
  unsigned short x, y, msglen, i;
1331 mateusz.vi 261 
  unsigned char msg2flag = 0;
262 
 
263 
  msglen = strlen(msg1);
264 
  if (msg2) {
265 
    msg2flag = 1;
266 
    i = strlen(msg2);
267 
    if (i > msglen) msglen = i;
268 
  }
269 
 
270 
  y = (screenh - 6) >> 1;
1312 mateusz.vi 271 
  x = (screenw - msglen - 4) >> 1;
1331 mateusz.vi 272 
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
273 
  x++;
1345 mateusz.vi 274 
 
1331 mateusz.vi 275 
  mdr_cout_str(y+1, x, msg1, attr, msglen);
276 
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
1312 mateusz.vi 277 
 
1327 mateusz.vi 278 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 279 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 280 
}
281 
 
282 
 
1342 mateusz.vi 283 
static unsigned char ui_confirm_if_unsaved(struct file *db) {
1355 mateusz.vi 284 
  unsigned char r = 0;
1342 mateusz.vi 285 
  if (db->modflag == 0) return(0);
286 
 
1355 mateusz.vi 287 
  mdr_cout_cursor_hide();
288 
 
1342 mateusz.vi 289 
  /* if file has been modified then ask for confirmation */
290 
  ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);
1355 mateusz.vi 291 
  if (keyb_getkey() != '\r') r = 1;
1342 mateusz.vi 292 
 
1355 mateusz.vi 293 
  mdr_cout_cursor_show();
294 
 
295 
  return(r);
1342 mateusz.vi 296 
}
297 
 
298 
 
1327 mateusz.vi 299 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 300 
  unsigned char x;
1310 mateusz.vi 301 
  const struct line far *l;
1316 mateusz.vi 302 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 303 
 
1392 mateusz.vi 304 
  /* quit early if nothing to refresh */
305 
  if (uidirty.from == 0xff) return;
306 
 
1288 mateusz.vi 307 
#ifdef DBG_REFRESH
1282 mateusz.vi 308 
  static char m = 'a';
309 
  m++;
310 
  if (m > 'z') m = 'a';
1288 mateusz.vi 311 
#endif
1282 mateusz.vi 312 
 
1310 mateusz.vi 313 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 314 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 315 
 
1310 mateusz.vi 316 
  /* iterate over lines and redraw whatever needs to be redrawn */
317 
  for (; l != NULL; l = l->next, y++) {
318 
 
319 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 320 
    if (y < uidirty.from) continue;
321 
    if (y > uidirty.to) break;
1282 mateusz.vi 322 
 
1318 mateusz.vi 323 
    x = 0;
1275 mateusz.vi 324 
    if (db->xoffset < l->len) {
1318 mateusz.vi 325 
      unsigned char i, limit;
326 
      if (l->len - db->xoffset < screenw) {
327 
        limit = l->len;
328 
      } else {
329 
        limit = db->xoffset + screenw - 1;
330 
      }
1333 mateusz.vi 331 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 332 
    }
1282 mateusz.vi 333 
 
1318 mateusz.vi 334 
    /* write empty spaces until end of line */
1333 mateusz.vi 335 
    if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);
1318 mateusz.vi 336 
 
1288 mateusz.vi 337 
#ifdef DBG_REFRESH
1333 mateusz.vi 338 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 339 
#endif
1282 mateusz.vi 340 
 
1275 mateusz.vi 341 
    if (y == screenh - 2) break;
342 
  }
1310 mateusz.vi 343 
 
1319 mateusz.vi 344 
  /* fill all lines below if empty (and they need to be redrawn) */
345 
  if (l == NULL) {
1327 mateusz.vi 346 
    while ((y < screenh - 1) && (y < uidirty.to)) {
1333 mateusz.vi 347 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);
1319 mateusz.vi 348 
    }
1318 mateusz.vi 349 
  }
1328 mateusz.vi 350 
 
351 
  /* scroll bar */
352 
  for (y = 0; y < (screenh - 1); y++) {
1333 mateusz.vi 353 
    mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 354 
  }
355 
 
356 
  /* scroll cursor */
357 
  if (db->totlines >= screenh) {
358 
    unsigned short topline = db->curline - db->cursorposy;
359 
    unsigned short col;
360 
    unsigned short totlines = db->totlines - screenh + 1;
361 
    if (db->totlines - screenh > screenh) {
362 
      col = topline / (totlines / (screenh - 1));
363 
    } else {
364 
      col = topline * (screenh - 1) / totlines;
365 
    }
366 
    if (col >= screenh - 1) col = screenh - 2;
1333 mateusz.vi 367 
    mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);
1328 mateusz.vi 368 
  }
1392 mateusz.vi 369 
 
370 
  /* clear out the dirty flag */
371 
  uidirty.from = 0xff;
1275 mateusz.vi 372 
}
373 
 
374 
 
1327 mateusz.vi 375 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 376 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 377 
 
378 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 379 
    db->cursorposx = 0;
1275 mateusz.vi 380 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 381 
    uidirty.from = 0;
382 
    uidirty.to = 0xff;
1275 mateusz.vi 383 
  } else {
1316 mateusz.vi 384 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 385 
  }
386 
}
387 
 
388 
 
1327 mateusz.vi 389 
static void cursor_up(struct file *db) {
1275 mateusz.vi 390 
  if (db->cursor->prev != NULL) {
1328 mateusz.vi 391 
    db->curline -= 1;
1275 mateusz.vi 392 
    db->cursor = db->cursor->prev;
1316 mateusz.vi 393 
    if (db->cursorposy == 0) {
1327 mateusz.vi 394 
      uidirty.from = 0;
395 
      uidirty.to = 0xff;
1275 mateusz.vi 396 
    } else {
1316 mateusz.vi 397 
      db->cursorposy -= 1;
1275 mateusz.vi 398 
    }
399 
  }
400 
}
401 
 
402 
 
1327 mateusz.vi 403 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 404 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 405 
  if (db->xoffset > db->cursor->len) {
406 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 407 
    uidirty.from = 0;
408 
    uidirty.to = 0xff;
1282 mateusz.vi 409 
  }
410 
 
411 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
412 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 413 
    uidirty.from = 0;
414 
    uidirty.to = 0xff;
1282 mateusz.vi 415 
  }
1316 mateusz.vi 416 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 417 
}
418 
 
419 
 
1327 mateusz.vi 420 
static void cursor_down(struct file *db) {
1276 mateusz.vi 421 
  if (db->cursor->next != NULL) {
1328 mateusz.vi 422 
    db->curline += 1;
1276 mateusz.vi 423 
    db->cursor = db->cursor->next;
1316 mateusz.vi 424 
    if (db->cursorposy < screenh - 2) {
425 
      db->cursorposy += 1;
1276 mateusz.vi 426 
    } else {
1327 mateusz.vi 427 
      uidirty.from = 0;
428 
      uidirty.to = 0xff;
1276 mateusz.vi 429 
    }
430 
  }
431 
}
432 
 
433 
 
1327 mateusz.vi 434 
static void cursor_left(struct file *db) {
1316 mateusz.vi 435 
  if (db->cursorposx > 0) {
436 
    db->cursorposx -= 1;
1302 mateusz.vi 437 
  } else if (db->xoffset > 0) {
438 
    db->xoffset -= 1;
1327 mateusz.vi 439 
    uidirty.from = 0;
440 
    uidirty.to = 0xff;
1302 mateusz.vi 441 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 442 
    cursor_up(db);
443 
    cursor_eol(db);
1302 mateusz.vi 444 
  }
445 
}
446 
 
447 
 
1327 mateusz.vi 448 
static void cursor_home(struct file *db) {
1316 mateusz.vi 449 
  db->cursorposx = 0;
1282 mateusz.vi 450 
  if (db->xoffset != 0) {
451 
    db->xoffset = 0;
1327 mateusz.vi 452 
    uidirty.from = 0;
453 
    uidirty.to = 0xff;
1282 mateusz.vi 454 
  }
1276 mateusz.vi 455 
}
456 
 
457 
 
1327 mateusz.vi 458 
static void cursor_right(struct file *db) {
1316 mateusz.vi 459 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
460 
    if (db->cursorposx < screenw - 2) {
461 
      db->cursorposx += 1;
1308 mateusz.vi 462 
    } else {
463 
      db->xoffset += 1;
1327 mateusz.vi 464 
      uidirty.from = 0;
465 
      uidirty.to = 0xff;
1308 mateusz.vi 466 
    }
1357 mateusz.vi 467 
  } else if (db->cursor->next != NULL) { /* jump to start of next line */
1327 mateusz.vi 468 
    cursor_down(db);
469 
    cursor_home(db);
1308 mateusz.vi 470 
  }
471 
}
472 
 
473 
 
1327 mateusz.vi 474 
static void del(struct file *db) {
1316 mateusz.vi 475 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
476 
    _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 477 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 478 
    uidirty.from = db->cursorposy;
479 
    uidirty.to = db->cursorposy;
1393 mateusz.vi 480 
    db->modflag = 1;
1292 mateusz.vi 481 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
482 
    struct line far *nextline = db->cursor->next;
483 
    if (db->cursor->next->len > 0) {
1340 mateusz.vi 484 
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
1337 mateusz.vi 485 
        _fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 486 
        db->cursor->len += db->cursor->next->len;
487 
      }
488 
    }
1340 mateusz.vi 489 
 
1292 mateusz.vi 490 
    db->cursor->next = db->cursor->next->next;
491 
    db->cursor->next->prev = db->cursor;
1340 mateusz.vi 492 
 
1339 mateusz.vi 493 
    line_free(nextline);
1327 mateusz.vi 494 
    uidirty.from = db->cursorposy;
495 
    uidirty.to = 0xff;
1328 mateusz.vi 496 
    db->totlines -= 1;
1393 mateusz.vi 497 
    db->modflag = 1;
1292 mateusz.vi 498 
  }
499 
}
500 
 
501 
 
1327 mateusz.vi 502 
static void bkspc(struct file *db) {
1302 mateusz.vi 503 
 
504 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1316 mateusz.vi 505 
  if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 506 
 
1327 mateusz.vi 507 
  cursor_left(db);
508 
  del(db);
1302 mateusz.vi 509 
}
510 
 
511 
 
1346 mateusz.vi 512 
/* returns 0 on success, 1 on file not found, 2 on other error */
1359 mateusz.vi 513 
static int loadfile(struct file *db, const char *fname) {
1324 mateusz.vi 514 
  char buff[512]; /* read one entire sector at a time (faster) */
515 
  char *buffptr;
516 
  unsigned int len, llen;
1287 mateusz.vi 517 
  int fd;
1324 mateusz.vi 518 
  unsigned char eolfound;
1287 mateusz.vi 519 
 
1355 mateusz.vi 520 
  /* free the entire linked list of lines */
521 
  db_rewind(db);
522 
  while (db->cursor) {
523 
    struct line far *victim;
524 
    victim = db->cursor;
525 
    db->cursor = db->cursor->next;
526 
    line_free(victim);
527 
  }
1321 mateusz.vi 528 
 
1355 mateusz.vi 529 
  /* zero out the struct */
530 
  bzero(db, sizeof(struct file));
531 
 
1321 mateusz.vi 532 
  if (*fname == 0) goto SKIPLOADING;
533 
 
1355 mateusz.vi 534 
  memcpy(db->fname, fname, strlen(fname));
535 
 
1287 mateusz.vi 536 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
1346 mateusz.vi 537 
    return(1);
1287 mateusz.vi 538 
  }
539 
 
1313 mateusz.vi 540 
  db->lfonly = 1;
541 
 
1324 mateusz.vi 542 
  /* start by adding an empty line */
1328 mateusz.vi 543 
  if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 544 
    /* TODO ERROR HANDLING */
545 
  }
1287 mateusz.vi 546 
 
1324 mateusz.vi 547 
  for (eolfound = 0;;) {
548 
    unsigned short consumedbytes;
549 
 
550 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
551 
    buffptr = buff;
552 
 
553 
    FINDLINE:
554 
 
1361 mateusz.vi 555 
    /* look for nearest \n (also expand tabs) */
1324 mateusz.vi 556 
    for (consumedbytes = 0;; consumedbytes++) {
1361 mateusz.vi 557 
 
558 
      if (buffptr[consumedbytes] == '\t') {
559 
        llen = consumedbytes;
560 
        break;
561 
      }
562 
 
1324 mateusz.vi 563 
      if (consumedbytes == len) {
564 
        llen = consumedbytes;
565 
        break;
1323 mateusz.vi 566 
      }
1324 mateusz.vi 567 
      if (buffptr[consumedbytes] == '\r') {
568 
        llen = consumedbytes;
569 
        consumedbytes++;
570 
        db->lfonly = 0;
1320 mateusz.vi 571 
        break;
572 
      }
1324 mateusz.vi 573 
      if (buffptr[consumedbytes] == '\n') {
574 
        eolfound = 1;
575 
        llen = consumedbytes;
576 
        consumedbytes++;
577 
        break;
578 
      }
1287 mateusz.vi 579 
    }
1324 mateusz.vi 580 
 
581 
    /* consumedbytes is the amount of bytes processed from buffptr,
582 
     * llen is the length of line's payload (without its line terminator) */
583 
 
584 
    /* append content, if line is non-empty */
585 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1339 mateusz.vi 586 
      goto IOERR;
1287 mateusz.vi 587 
    }
588 
 
1324 mateusz.vi 589 
    /* add a new line if necessary */
590 
    if (eolfound) {
1328 mateusz.vi 591 
      if (line_add(db, NULL, 0) != 0) {
1339 mateusz.vi 592 
        goto IOERR;
1324 mateusz.vi 593 
      }
594 
      eolfound = 0;
595 
    }
1287 mateusz.vi 596 
 
1361 mateusz.vi 597 
    /* append 8 spaces if tab char found */
598 
    if ((consumedbytes < len) && (buffptr[consumedbytes] == '\t')) {
599 
      consumedbytes++;
600 
      if (line_append(db, "        ", 8) != 0) {
601 
        goto IOERR;
602 
      }
603 
    }
604 
 
1324 mateusz.vi 605 
    /* anything left? process the buffer leftover again */
606 
    if (consumedbytes < len) {
607 
      len -= consumedbytes;
608 
      buffptr += consumedbytes;
609 
      goto FINDLINE;
610 
    }
611 
 
612 
  }
613 
 
1287 mateusz.vi 614 
  _dos_close(fd);
615 
 
1321 mateusz.vi 616 
  SKIPLOADING:
617 
 
1320 mateusz.vi 618 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
1339 mateusz.vi 619 
  if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
620 
  db_rewind(db);
1320 mateusz.vi 621 
 
1346 mateusz.vi 622 
  return(0);
1339 mateusz.vi 623 
 
624 
  IOERR:
625 
  _dos_close(fd);
1346 mateusz.vi 626 
  return(2);
1287 mateusz.vi 627 
}
628 
 
629 
 
1356 mateusz.vi 630 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
631 
 * of argc and argv, saves some 330 bytes of binary size
632 
 * returns non-zero on error */
633 
static int parseargv(struct file *dbarr) {
634 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
635 
  unsigned short count = 0;
636 
  char *arg;
637 
  unsigned short lastarg = 0;
1359 mateusz.vi 638 
  int err;
1356 mateusz.vi 639 
 
640 
  while (!lastarg) {
641 
    /* jump to nearest arg */
642 
    while (*tail == ' ') {
643 
      *tail = 0;
644 
      tail++;
645 
    }
646 
 
647 
    if (*tail == '\r') {
648 
      *tail = 0;
649 
      break;
650 
    }
651 
 
652 
    arg = tail;
653 
 
654 
    /* jump to next delimiter */
655 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
656 
 
657 
    /* if \r then remember this is the last arg */
658 
    if (*tail == '\r') lastarg = 1;
659 
 
660 
    *tail = 0;
661 
    tail++;
662 
 
663 
    /* look at the arg now */
664 
    if (*arg == '/') {
1387 mateusz.vi 665 
      const char far *self = mdr_dos_selfexe();
666 
      unsigned short i;
667 
      if (self == NULL) self = "sved";
668 
      for (i = 0; self[i] != 0; i++) {
669 
        if (self[i] == '\\') {
670 
          self += i + 1;
671 
          i = 0;
672 
        }
673 
      }
1390 mateusz.vi 674 
      mdr_coutraw_str(svarlang_str(1,3));
675 
      mdr_coutraw_str(" [");
676 
      mdr_coutraw_str(svarlang_str(1,4));
677 
      mdr_coutraw_puts(" " PVER "]");
678 
      mdr_coutraw_puts("Copyright (C) " PDATE " Mateusz Viste");
1387 mateusz.vi 679 
      mdr_coutraw_crlf();
680 
      mdr_coutraw_str(svarlang_str(1,0)); /* usage: */
681 
      mdr_coutraw_char(' ');
682 
      while (*self != 0) {
683 
        mdr_coutraw_char(*self);
684 
        self++;
685 
      }
686 
      mdr_coutraw_char(' ');
687 
      mdr_coutraw_puts(svarlang_str(1,1)); /* args syntax */
1356 mateusz.vi 688 
      return(-1);
689 
    }
690 
 
691 
    /* looks to be a filename */
692 
    if (count == 10) {
693 
      mdr_coutraw_puts(svarlang_str(0,12));
694 
      return(-1); /* too many files */
695 
    }
696 
 
697 
    /* try loading it */
1387 mateusz.vi 698 
    mdr_coutraw_str(svarlang_str(1,2));
699 
    mdr_coutraw_char(' ');
1356 mateusz.vi 700 
    mdr_coutraw_puts(arg);
701 
    err = loadfile(&(dbarr[count]), arg);
702 
    if (err) {
703 
      if (err == 1) { /* file not found */
704 
        err = 11;
705 
      } else { /* general error */
706 
        err = 10;
707 
      }
708 
      mdr_coutraw_puts(svarlang_str(0,err));
709 
      return(-1);
710 
    }
711 
    count++;
712 
  }
713 
 
714 
  return(0);
715 
}
716 
 
717 
 
1332 mateusz.vi 718 
static int savefile(const struct file *db, const char *newfname) {
1311 mateusz.vi 719 
  int fd;
720 
  const struct line far *l;
721 
  unsigned bytes;
1313 mateusz.vi 722 
  unsigned char eollen;
723 
  unsigned char eolbuf[2];
1332 mateusz.vi 724 
  int errflag = 0;
1313 mateusz.vi 725 
 
1332 mateusz.vi 726 
  /* either create a new file if newfname provided, or... */
727 
  if (newfname) {
728 
    if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
729 
  } else { /* ...open db->fname */
730 
    if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
1311 mateusz.vi 731 
  }
732 
 
733 
  l = db->cursor;
734 
  while (l->prev) l = l->prev;
735 
 
1313 mateusz.vi 736 
  /* preset line terminators */
737 
  if (db->lfonly) {
738 
    eolbuf[0] = '\n';
739 
    eollen = 1;
740 
  } else {
741 
    eolbuf[0] = '\r';
742 
    eolbuf[1] = '\n';
743 
    eollen = 2;
744 
  }
745 
 
1311 mateusz.vi 746 
  while (l) {
1324 mateusz.vi 747 
    /* do not write the last empty line, it is only useful for edition */
748 
    if (l->len != 0) {
1332 mateusz.vi 749 
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
1324 mateusz.vi 750 
    } else if (l->next == NULL) {
751 
      break;
752 
    }
1332 mateusz.vi 753 
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
1311 mateusz.vi 754 
    l = l->next;
755 
  }
756 
 
1332 mateusz.vi 757 
  errflag |= _dos_close(fd);
1330 mateusz.vi 758 
 
1332 mateusz.vi 759 
  return(errflag);
1311 mateusz.vi 760 
}
761 
 
762 
 
1327 mateusz.vi 763 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1340 mateusz.vi 764 
  if (curline_resize(db, db->cursor->len + len) == 0) {
1317 mateusz.vi 765 
    unsigned short off = db->xoffset + db->cursorposx;
1393 mateusz.vi 766 
    db->modflag = 1;
1317 mateusz.vi 767 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
768 
    db->cursor->len += len;
1327 mateusz.vi 769 
    uidirty.from = db->cursorposy;
770 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 771 
    while (len--) {
772 
      db->cursor->payload[off++] = *databuf;
773 
      databuf++;
1327 mateusz.vi 774 
      cursor_right(db);
1317 mateusz.vi 775 
    }
776 
  }
777 
}
778 
 
779 
 
1343 mateusz.vi 780 
/* recompute db->curline by counting nodes in linked list */
781 
static void recompute_curline(struct file *db) {
782 
  const struct line far *l = db->cursor;
783 
 
784 
  db->curline = 0;
785 
  while (l->prev != NULL) {
786 
    db->curline += 1;
787 
    l = l->prev;
788 
  }
789 
}
790 
 
791 
 
1354 mateusz.vi 792 
enum MENU_ACTION {
1393 mateusz.vi 793 
  MENU_NONE   = 0,
794 
  MENU_OPEN   = 1,
795 
  MENU_SAVE   = 2,
796 
  MENU_SAVEAS = 3,
797 
  MENU_CLOSE  = 4,
798 
  MENU_CHGEOL = 5,
799 
  MENU_QUIT   = 6,
1354 mateusz.vi 800 
};
801 
 
802 
static enum MENU_ACTION ui_menu(void) {
803 
  unsigned short i, curchoice, attr, x, slen;
1393 mateusz.vi 804 
  unsigned short xorigin, yorigin;
1354 mateusz.vi 805 
  uidirty.from = 0;
806 
  uidirty.to = 0xff;
807 
  uidirty.statusbar = 1;
808 
 
809 
  /* find out the longest string */
810 
  slen = 0;
1355 mateusz.vi 811 
  for (i = MENU_OPEN; i <= MENU_QUIT; i++) {
1354 mateusz.vi 812 
    x = strlen(svarlang_str(8, i));
813 
    if (x > slen) slen = x;
814 
  }
815 
 
1393 mateusz.vi 816 
  /* calculate where to draw the menu on screen */
817 
  xorigin = (screenw - (slen + 5)) / 2;
818 
  yorigin = (screenh - (MENU_QUIT - MENU_OPEN + 5)) / 2;
819 
 
1355 mateusz.vi 820 
  curchoice = MENU_OPEN;
1354 mateusz.vi 821 
  for (;;) {
822 
    /* render menu */
1393 mateusz.vi 823 
    for (i = MENU_NONE; i <= MENU_QUIT + 1; i++) {
824 
      mdr_cout_char_rep(yorigin + i, xorigin, ' ', SCHEME_MENU, slen+4);
1354 mateusz.vi 825 
      if (i == curchoice) {
826 
        attr = SCHEME_MENU_CUR;
1393 mateusz.vi 827 
        mdr_cout_char(yorigin + i, xorigin + 1, '>', SCHEME_MENU_SEL);
1354 mateusz.vi 828 
      } else {
829 
        attr = SCHEME_MENU;
830 
      }
1393 mateusz.vi 831 
      x = mdr_cout_str(yorigin + i, xorigin + 2, svarlang_str(8, i), attr, slen);
1354 mateusz.vi 832 
      if (i == curchoice) {
1393 mateusz.vi 833 
        mdr_cout_char_rep(yorigin + i, xorigin + x + 2, ' ', SCHEME_MENU_SEL, slen - x + 1);
834 
        mdr_cout_locate(yorigin + i, xorigin + x + 2);
1354 mateusz.vi 835 
      }
836 
    }
837 
    /* wait for key */
838 
    switch (keyb_getkey()) {
839 
      case '\r': return(curchoice); /* ENTER */
840 
      case 0x150: /* down */
841 
        if (curchoice == MENU_QUIT) {
1355 mateusz.vi 842 
          curchoice = MENU_OPEN;
1354 mateusz.vi 843 
        } else {
844 
          curchoice++;
845 
        }
846 
        break;
847 
      case 0x148: /* up */
1355 mateusz.vi 848 
        if (curchoice == MENU_OPEN) {
1354 mateusz.vi 849 
          curchoice = MENU_QUIT;
850 
        } else {
851 
          curchoice--;
852 
        }
853 
        break;
854 
      default: return(MENU_NONE);
855 
    }
856 
  }
857 
}
858 
 
859 
 
1355 mateusz.vi 860 
static struct file *select_slot(struct file *dbarr, unsigned short curfile) {
861 
  uidirty.from = 0;
862 
  uidirty.to = 0xff;
863 
  uidirty.statusbar = 1;
864 
 
865 
  dbarr = &(dbarr[curfile]);
866 
  ui_basic(dbarr, curfile);
867 
  ui_refresh(dbarr);
868 
  return(dbarr);
869 
}
870 
 
871 
 
1347 mateusz.vi 872 
/* main returns nothing, ie. sved always exits with a zero exit code
873 
 * (this saves 20 bytes of executable footprint) */
874 
void main(void) {
1355 mateusz.vi 875 
  static struct file dbarr[10];
876 
  unsigned short curfile;
877 
  struct file *db = dbarr; /* visible file is the first slot by default */
1275 mateusz.vi 878 
 
1307 mateusz.vi 879 
  {
1364 mateusz.vi 880 
    unsigned short i = 0;
881 
    const char far *selfptr;
882 
    char self[128], lang[8];
883 
    selfptr = mdr_dos_selfexe();
884 
    if (selfptr != NULL) {
885 
      do {
886 
        self[i] = selfptr[i];
887 
      } while (self[i++] != 0);
888 
      svarlang_autoload_exepath(self, mdr_dos_getenv(lang, "LANG", sizeof(lang)));
889 
    }
1307 mateusz.vi 890 
  }
1282 mateusz.vi 891 
 
1355 mateusz.vi 892 
  /* preload all slots with empty files */
893 
  for (curfile = 9;; curfile--) {
894 
    loadfile(&(dbarr[curfile]), "");
895 
    if (curfile == 0) break;
896 
  }
897 
 
1356 mateusz.vi 898 
  /* parse argv (and load files, if any passed on) */
899 
  if (parseargv(dbarr) != 0) return;
1282 mateusz.vi 900 
 
1333 mateusz.vi 901 
  if (mdr_cout_init(&screenw, &screenh)) {
902 
    /* load color scheme if mdr_cout_init returns a color flag */
903 
    SCHEME_TEXT = 0x17;
1354 mateusz.vi 904 
    SCHEME_MENU = 0x70;
1388 mateusz.vi 905 
    SCHEME_MENU_CUR = 0x6f;
906 
    SCHEME_MENU_SEL = 0x66;
1333 mateusz.vi 907 
    SCHEME_STBAR1 = 0x70;
908 
    SCHEME_STBAR2 = 0x78;
1392 mateusz.vi 909 
    SCHEME_STBAR3 = 0x3f;
1333 mateusz.vi 910 
    SCHEME_SCROLL = 0x70;
1388 mateusz.vi 911 
    SCHEME_MSG = 0x6f;
1333 mateusz.vi 912 
    SCHEME_ERR = 0x4f;
913 
  }
1275 mateusz.vi 914 
 
915 
  for (;;) {
916 
    int k;
917 
 
1362 mateusz.vi 918 
    /* add an extra empty line if cursor is on last line and this line is not empty */
919 
    if ((db->cursor->next == NULL) && (db->cursor->len != 0)) {
920 
      if (line_add(db, NULL, 0) == 0) {
921 
        db->cursor = db->cursor->prev; /* line_add() changes the cursor pointer */
922 
      }
923 
    }
924 
 
1327 mateusz.vi 925 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 926 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 927 
 
1392 mateusz.vi 928 
    ui_refresh(db);
929 
 
1355 mateusz.vi 930 
    if ((uidirty.statusbar != 0) || (db->modflagprev != db->modflag)) {
931 
      ui_basic(db, curfile);
1342 mateusz.vi 932 
      uidirty.statusbar = 0;
1355 mateusz.vi 933 
      db->modflagprev = db->modflag;
1342 mateusz.vi 934 
    }
1328 mateusz.vi 935 
#ifdef DBG_LINENUM
936 
      {
937 
        char ddd[10];
938 
        db->curline += 1;
939 
        ddd[0] = '0' + db->curline / 100;
940 
        ddd[1] = '0' + (db->curline % 100) / 10;
941 
        ddd[2] = '0' + (db->curline % 10);
942 
        db->curline -= 1;
943 
        ddd[3] = '/';
944 
        ddd[4] = '0' + db->totlines / 100;
945 
        ddd[5] = '0' + (db->totlines % 100) / 10;
946 
        ddd[6] = '0' + (db->totlines % 10);
947 
        ddd[7] = 0;
1333 mateusz.vi 948 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 949 
      }
950 
#endif
1275 mateusz.vi 951 
 
952 
    k = keyb_getkey();
1282 mateusz.vi 953 
 
1275 mateusz.vi 954 
    if (k == 0x150) { /* down */
1327 mateusz.vi 955 
      cursor_down(db);
1275 mateusz.vi 956 
 
957 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 958 
      cursor_up(db);
1275 mateusz.vi 959 
 
960 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 961 
      cursor_right(db);
1275 mateusz.vi 962 
 
963 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 964 
      cursor_left(db);
1275 mateusz.vi 965 
 
1282 mateusz.vi 966 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 967 
      unsigned char dist = db->cursorposy + screenh - 1;
968 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
969 
        db->cursor = db->cursor->prev;
970 
        dist--;
971 
      }
972 
      if (dist != 0) {
973 
        db->cursorposy = 0;
974 
        db->cursorposx = 0;
975 
      } else {
976 
        dist = db->cursorposy;
977 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
978 
      }
979 
      uidirty.from = 0;
980 
      uidirty.to = 0xff;
1343 mateusz.vi 981 
      recompute_curline(db);
1282 mateusz.vi 982 
 
983 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 984 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
985 
      while ((dist != 0) && (db->cursor->next != NULL)) {
986 
        db->cursor = db->cursor->next;
987 
        dist--;
988 
      }
989 
      if (dist != 0) {
990 
        db->cursorposy = screenh - 2;
991 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
992 
        db->cursorposx = 0;
993 
      } else {
994 
        dist = screenh - 2 - db->cursorposy;
995 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
996 
      }
997 
      uidirty.from = 0;
998 
      uidirty.to = 0xff;
1343 mateusz.vi 999 
      recompute_curline(db);
1282 mateusz.vi 1000 
 
1001 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 1002 
       cursor_home(db);
1282 mateusz.vi 1003 
 
1004 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 1005 
       cursor_eol(db);
1282 mateusz.vi 1006 
 
1275 mateusz.vi 1007 
    } else if (k == 0x1B) { /* ESC */
1354 mateusz.vi 1008 
      int quitnow = 0;
1394 mateusz.vi 1009 
      char fname[64];
1354 mateusz.vi 1010 
      int saveflag = 0;
1393 mateusz.vi 1011 
      enum MENU_ACTION ui_action;
1275 mateusz.vi 1012 
 
1392 mateusz.vi 1013 
      /* collect the exact menu action and clear the screen */
1014 
      ui_action = ui_menu();
1015 
      ui_refresh(db);
1354 mateusz.vi 1016 
 
1392 mateusz.vi 1017 
      switch (ui_action) {
1018 
 
1354 mateusz.vi 1019 
        case MENU_NONE:
1020 
          break;
1021 
 
1022 
        case MENU_OPEN:
1023 
          /* display a warning if unsaved changes are pending */
1024 
          if (db->modflag != 0) ui_msg(svarlang_str(0,4), svarlang_str(0,8), SCHEME_MSG);
1025 
 
1026 
          /* ask for filename */
1027 
          ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
1028 
          if (fname[0] != 0) {
1359 mateusz.vi 1029 
            int err;
1354 mateusz.vi 1030 
            err = loadfile(db, fname);
1031 
            if (err != 0) {
1032 
              if (err == 1) {
1033 
                ui_msg(svarlang_str(0,11), NULL, SCHEME_ERR); /* file not found */
1034 
              } else {
1035 
                ui_msg(svarlang_str(0,10), NULL, SCHEME_ERR);  /* ERROR */
1036 
              }
1037 
              mdr_bios_tickswait(44); /* 3s */
1355 mateusz.vi 1038 
              loadfile(db, "");
1354 mateusz.vi 1039 
            }
1040 
          }
1393 mateusz.vi 1041 
          uidirty.from = 0;
1042 
          uidirty.to = 0xff;
1043 
          uidirty.statusbar = 1;
1354 mateusz.vi 1044 
          break;
1045 
 
1046 
        case MENU_SAVEAS:
1047 
          saveflag = 1;
1048 
          /* FALLTHRU */
1049 
        case MENU_SAVE:
1050 
          if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
1051 
            ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
1052 
            if (*fname == 0) break;
1053 
            saveflag = savefile(db, fname);
1054 
            if (saveflag == 0) memcpy(db->fname, fname, sizeof(fname));
1055 
          } else {
1056 
            saveflag = savefile(db, NULL);
1057 
          }
1058 
 
1059 
          if (saveflag == 0) {
1060 
            db->modflag = 0;
1061 
            ui_msg(svarlang_str(0, 2), NULL, SCHEME_MSG);
1062 
            mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
1063 
          } else {
1064 
            ui_msg(svarlang_str(0, 3), NULL, SCHEME_ERR);
1065 
            mdr_bios_tickswait(36); /* 2s */
1066 
          }
1067 
          break;
1068 
 
1355 mateusz.vi 1069 
        case MENU_CLOSE:
1070 
          if (ui_confirm_if_unsaved(db) == 0) {
1071 
            loadfile(db, "");
1072 
          }
1073 
          uidirty.from = 0;
1074 
          uidirty.to = 0xff;
1075 
          uidirty.statusbar = 1;
1076 
          break;
1077 
 
1354 mateusz.vi 1078 
        case MENU_CHGEOL:
1393 mateusz.vi 1079 
          db->modflag = 1;
1354 mateusz.vi 1080 
          db->lfonly ^= 1;
1081 
          break;
1082 
 
1083 
        case MENU_QUIT:
1355 mateusz.vi 1084 
          quitnow = 1;
1085 
          for (curfile = 0; curfile < 10; curfile++) {
1086 
            if (dbarr[curfile].modflag) {
1087 
              db = select_slot(dbarr, curfile);
1088 
              if (ui_confirm_if_unsaved(db) != 0) quitnow = 0;
1089 
            }
1090 
          }
1354 mateusz.vi 1091 
          break;
1092 
      }
1093 
 
1094 
      if (quitnow) break;
1095 
 
1289 mateusz.vi 1096 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 1097 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 1098 
      /* add a new line */
1328 mateusz.vi 1099 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1393 mateusz.vi 1100 
        db->modflag = 1;
1328 mateusz.vi 1101 
        db->cursor = db->cursor->prev; /* back to original line */
1289 mateusz.vi 1102 
        /* trim the line above */
1328 mateusz.vi 1103 
        db->cursor->len = off;
1289 mateusz.vi 1104 
        /* move cursor to the (new) line below */
1343 mateusz.vi 1105 
        db->curline -= 1;
1328 mateusz.vi 1106 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 1107 
        uidirty.to = 0xff;
1328 mateusz.vi 1108 
        cursor_down(db);
1109 
        cursor_home(db);
1289 mateusz.vi 1110 
      } else {
1111 
        /* ERROR: OUT OF MEMORY */
1112 
      }
1113 
 
1292 mateusz.vi 1114 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 1115 
      del(db);
1292 mateusz.vi 1116 
 
1302 mateusz.vi 1117 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 1118 
      bkspc(db);
1302 mateusz.vi 1119 
 
1308 mateusz.vi 1120 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 1121 
      char c = k;
1327 mateusz.vi 1122 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 1123 
 
1317 mateusz.vi 1124 
    } else if (k == 0x009) { /* TAB */
1348 mateusz.vi 1125 
      insert_in_line(db, "        ", 8);
1317 mateusz.vi 1126 
 
1355 mateusz.vi 1127 
    } else if ((k >= 0x13b) && (k <= 0x144)) { /* F1..F10 */
1128 
      curfile = k - 0x13b;
1129 
      db = select_slot(dbarr, curfile);
1309 mateusz.vi 1130 
 
1325 mateusz.vi 1131 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
1132 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
1133 
      for (;;) {
1134 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
1135 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 1136 
        cursor_right(db);
1325 mateusz.vi 1137 
      }
1138 
      /* now skip to next non-space or end of file */
1139 
      for (;;) {
1327 mateusz.vi 1140 
        cursor_right(db);
1325 mateusz.vi 1141 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1142 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
1143 
      }
1144 
 
1145 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 1146 
      cursor_left(db);
1325 mateusz.vi 1147 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
1148 
      for (;;) {
1149 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
1150 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 1151 
        cursor_left(db);
1325 mateusz.vi 1152 
      }
1153 
      /* now skip to next space or start of file */
1154 
      for (;;) {
1327 mateusz.vi 1155 
        cursor_left(db);
1325 mateusz.vi 1156 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 1157 
          cursor_right(db);
1325 mateusz.vi 1158 
          break;
1159 
        }
1160 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
1161 
      }
1162 
 
1333 mateusz.vi 1163 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 1164 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
1165 
      char buff[4];
1166 
      const char *HEX = "0123456789ABCDEF";
1167 
      buff[0] = HEX[(k >> 8) & 15];
1168 
      buff[1] = HEX[(k >> 4) & 15];
1169 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 1170 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
1171 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1275 mateusz.vi 1172 
      keyb_getkey();
1173 
      break;
1333 mateusz.vi 1174 
#endif
1275 mateusz.vi 1175 
    }
1176 
  }
1177 
 
1178 
  mdr_cout_close();
1179 
 
1320 mateusz.vi 1180 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 1181 
 
1347 mateusz.vi 1182 
  return;
1275 mateusz.vi 1183 
}