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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 <stdlib.h>
29 
#include <string.h>
30 
 
1312 mateusz.vi 31 
#include "mdr\bios.h"
1275 mateusz.vi 32 
#include "mdr\cout.h"
1307 mateusz.vi 33 
#include "mdr\dos.h"
1275 mateusz.vi 34 
#include "mdr\keyb.h"
35 
 
1282 mateusz.vi 36 
#include "svarlang\svarlang.h"
37 
 
1326 mateusz.vi 38 
 
39 
/*****************************************************************************
40 
 * global variables and definitions                                          *
41 
 *****************************************************************************/
42 
 
1275 mateusz.vi 43 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
1333 mateusz.vi 44 
static unsigned char SCHEME_TEXT   = 0x07,
45 
                     SCHEME_STBAR1 = 0x70,
46 
                     SCHEME_STBAR2 = 0x70,
47 
                     SCHEME_STBAR3 = 0xf0,
48 
                     SCHEME_SCROLL = 0x70,
49 
                     SCHEME_MSG    = 0x70,
50 
                     SCHEME_ERR    = 0xf0;
1327 mateusz.vi 51 
 
1326 mateusz.vi 52 
static unsigned char screenw, screenh;
1275 mateusz.vi 53 
 
1327 mateusz.vi 54 
static struct {
55 
    unsigned char from;
56 
    unsigned char to;
1342 mateusz.vi 57 
    unsigned char statusbar;
58 
} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */
1327 mateusz.vi 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 
 
1339 mateusz.vi 87 
static struct line far *line_calloc(unsigned short siz) {
1342 mateusz.vi 88 
  struct line far *res;
1339 mateusz.vi 89 
  unsigned int seg;
1341 mateusz.vi 90 
  if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);
1342 mateusz.vi 91 
  res = MK_FP(seg, 0);
92 
  _fmemset(res, 0, sizeof(struct line) + siz);
1339 mateusz.vi 93 
  return(MK_FP(seg, 0));
94 
}
95 
 
96 
 
97 
static void line_free(struct line far *ptr) {
98 
  _dos_freemem(FP_SEG(ptr));
99 
}
100 
 
101 
 
1340 mateusz.vi 102 
static signed char curline_resize(struct file far *db, unsigned short newsiz) {
1339 mateusz.vi 103 
  unsigned int maxavail;
104 
  struct line far *newptr;
105 
 
1341 mateusz.vi 106 
  /* try resizing the block (much faster) */
107 
  if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);
1339 mateusz.vi 108 
 
109 
  /* create a new block and copy data over */
110 
  newptr = line_calloc(newsiz);
1340 mateusz.vi 111 
  if (newptr == NULL) return(-1);
112 
  _fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
113 
 
114 
  /* rewire the linked list */
115 
  db->cursor = newptr;
116 
  if (newptr->next) newptr->next->prev = newptr;
117 
  if (newptr->prev) newptr->prev->next = newptr;
118 
 
119 
  return(0);
1339 mateusz.vi 120 
}
121 
 
122 
 
1328 mateusz.vi 123 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 124 
 * returns non-zero on error */
1328 mateusz.vi 125 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 126 
  struct line far *l;
1275 mateusz.vi 127 
 
1339 mateusz.vi 128 
  l = line_calloc(slen);
1287 mateusz.vi 129 
  if (l == NULL) return(-1);
130 
 
1275 mateusz.vi 131 
  l->prev = db->cursor;
132 
  if (db->cursor) {
133 
    l->next = db->cursor->next;
134 
    db->cursor->next = l;
135 
    l->next->prev = l;
136 
  }
137 
  db->cursor = l;
1342 mateusz.vi 138 
  if (slen > 0) {
139 
    _fmemmove(l->payload, line, slen);
140 
    l->len = slen;
141 
  }
1287 mateusz.vi 142 
 
1328 mateusz.vi 143 
  db->totlines += 1;
144 
  db->curline += 1;
145 
 
1287 mateusz.vi 146 
  return(0);
1275 mateusz.vi 147 
}
148 
 
149 
 
1332 mateusz.vi 150 
static void ui_getstring(const char *query, char *s, unsigned char maxlen) {
151 
  unsigned char len = 0, y, x;
152 
  int k;
153 
 
154 
  if (maxlen == 0) return;
155 
  maxlen--; /* make room for the nul terminator */
156 
 
157 
  y = screenh - 1;
158 
 
159 
  /* print query string */
1333 mateusz.vi 160 
  x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);
161 
  mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 162 
 
163 
  for (;;) {
164 
    mdr_cout_locate(y, x + len);
165 
    k = keyb_getkey();
166 
 
167 
    if (k == 0x1b) return; /* ESC */
168 
 
169 
    if (k == '\r') {
170 
      s[len] = 0;
171 
      return;
172 
    }
173 
 
174 
    if ((k == 0x08) && (len > 0)) { /* BKSPC */
175 
      len--;
1333 mateusz.vi 176 
      mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);
1332 mateusz.vi 177 
      continue;
178 
    }
179 
 
180 
    if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
1333 mateusz.vi 181 
      mdr_cout_char(y, x + len, k, SCHEME_STBAR3);
1332 mateusz.vi 182 
      s[len++] = k;
183 
    }
184 
 
185 
  }
186 
}
187 
 
188 
 
1324 mateusz.vi 189 
/* append a nul-terminated string to line at cursor position */
190 
static int line_append(struct file *f, const char far *buf, unsigned short len) {
191 
  if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */
1340 mateusz.vi 192 
  if (curline_resize(f, f->cursor->len + len) != 0) return(-1);
1337 mateusz.vi 193 
  _fmemmove(f->cursor->payload + f->cursor->len, buf, len);
1324 mateusz.vi 194 
  f->cursor->len += len;
195 
 
196 
  return(0);
197 
}
198 
 
199 
 
1315 mateusz.vi 200 
static void db_rewind(struct file *db) {
1275 mateusz.vi 201 
  if (db->cursor == NULL) return;
202 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 203 
  db->curline = 0;
1275 mateusz.vi 204 
}
205 
 
206 
 
1326 mateusz.vi 207 
static void ui_basic(const struct file *db) {
1302 mateusz.vi 208 
  const char *s = svarlang_strid(0); /* HELP */
1335 mateusz.vi 209 
  unsigned char helpcol = screenw - strlen(s);
1275 mateusz.vi 210 
 
1330 mateusz.vi 211 
  /* fill status bar with background (without modflag as it is refreshed by ui_refresh) */
1333 mateusz.vi 212 
  mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);
1313 mateusz.vi 213 
 
214 
  /* filename */
1330 mateusz.vi 215 
  {
216 
    const char *fn = db->fname;
217 
    if (*fn == 0) fn = svarlang_str(0, 1);
1333 mateusz.vi 218 
    mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);
1321 mateusz.vi 219 
  }
1313 mateusz.vi 220 
 
221 
  /* eol type */
1330 mateusz.vi 222 
  {
223 
    const char *eoltype = "CRLF";
224 
    if (db->lfonly) eoltype = "LF";
1335 mateusz.vi 225 
    mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 226 
  }
1313 mateusz.vi 227 
 
1335 mateusz.vi 228 
  mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 229 
}
230 
 
231 
 
1331 mateusz.vi 232 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
1312 mateusz.vi 233 
  unsigned short x, y, msglen, i;
1331 mateusz.vi 234 
  unsigned char msg2flag = 0;
235 
 
236 
  msglen = strlen(msg1);
237 
  if (msg2) {
238 
    msg2flag = 1;
239 
    i = strlen(msg2);
240 
    if (i > msglen) msglen = i;
241 
  }
242 
 
243 
  y = (screenh - 6) >> 1;
1312 mateusz.vi 244 
  x = (screenw - msglen - 4) >> 1;
1331 mateusz.vi 245 
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
246 
  x++;
247 
  mdr_cout_str(y+1, x, msg1, attr, msglen);
248 
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
1312 mateusz.vi 249 
 
1327 mateusz.vi 250 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 251 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 252 
}
253 
 
254 
 
1342 mateusz.vi 255 
static unsigned char ui_confirm_if_unsaved(struct file *db) {
256 
  if (db->modflag == 0) return(0);
257 
 
258 
  /* if file has been modified then ask for confirmation */
259 
  ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);
260 
  if (keyb_getkey() == '\r') return(0);
261 
 
262 
  return(1);
263 
}
264 
 
265 
 
1326 mateusz.vi 266 
static void ui_help(void) {
1309 mateusz.vi 267 
#define MAXLINLEN 35
1336 mateusz.vi 268 
  unsigned char i, offset;
1325 mateusz.vi 269 
  offset = (screenw - MAXLINLEN + 2) >> 1;
1335 mateusz.vi 270 
 
271 
  for (i = 2; i < 18; i++) {
1333 mateusz.vi 272 
    mdr_cout_char_rep(i, offset - 2, ' ', SCHEME_STBAR1, MAXLINLEN + 2);
1309 mateusz.vi 273 
  }
274 
 
1335 mateusz.vi 275 
  for (i = 0; i < 20; i++) {
1337 mateusz.vi 276 
    const char *s = svarlang_str(8, i);
1335 mateusz.vi 277 
    if (s[0] == 0) break;
278 
    if (s[0] == '.') continue;
1336 mateusz.vi 279 
    mdr_cout_locate(3 + i, offset + mdr_cout_str(3 + i, offset, s, SCHEME_STBAR1, MAXLINLEN));
1309 mateusz.vi 280 
  }
281 
 
282 
  keyb_getkey();
283 
#undef MAXLINLEN
284 
}
285 
 
286 
 
1327 mateusz.vi 287 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 288 
  unsigned char x;
1310 mateusz.vi 289 
  const struct line far *l;
1316 mateusz.vi 290 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 291 
 
1288 mateusz.vi 292 
#ifdef DBG_REFRESH
1282 mateusz.vi 293 
  static char m = 'a';
294 
  m++;
295 
  if (m > 'z') m = 'a';
1288 mateusz.vi 296 
#endif
1282 mateusz.vi 297 
 
1310 mateusz.vi 298 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 299 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 300 
 
1310 mateusz.vi 301 
  /* iterate over lines and redraw whatever needs to be redrawn */
302 
  for (; l != NULL; l = l->next, y++) {
303 
 
304 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 305 
    if (y < uidirty.from) continue;
306 
    if (y > uidirty.to) break;
1282 mateusz.vi 307 
 
1318 mateusz.vi 308 
    x = 0;
1275 mateusz.vi 309 
    if (db->xoffset < l->len) {
1318 mateusz.vi 310 
      unsigned char i, limit;
311 
      if (l->len - db->xoffset < screenw) {
312 
        limit = l->len;
313 
      } else {
314 
        limit = db->xoffset + screenw - 1;
315 
      }
1333 mateusz.vi 316 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 317 
    }
1282 mateusz.vi 318 
 
1318 mateusz.vi 319 
    /* write empty spaces until end of line */
1333 mateusz.vi 320 
    if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);
1318 mateusz.vi 321 
 
1288 mateusz.vi 322 
#ifdef DBG_REFRESH
1333 mateusz.vi 323 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 324 
#endif
1282 mateusz.vi 325 
 
1275 mateusz.vi 326 
    if (y == screenh - 2) break;
327 
  }
1310 mateusz.vi 328 
 
1319 mateusz.vi 329 
  /* fill all lines below if empty (and they need to be redrawn) */
330 
  if (l == NULL) {
1327 mateusz.vi 331 
    while ((y < screenh - 1) && (y < uidirty.to)) {
1333 mateusz.vi 332 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);
1319 mateusz.vi 333 
    }
1318 mateusz.vi 334 
  }
1328 mateusz.vi 335 
 
1330 mateusz.vi 336 
  /* "file changed" flag */
337 
  {
338 
    char flg = ' ';
339 
    if (db->modflag) flg = '*';
1333 mateusz.vi 340 
    mdr_cout_char(screenh - 1, 0, flg, SCHEME_STBAR1);
1330 mateusz.vi 341 
  }
342 
 
1328 mateusz.vi 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 
  }
1275 mateusz.vi 361 
}
362 
 
363 
 
1327 mateusz.vi 364 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 365 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 366 
 
367 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 368 
    db->cursorposx = 0;
1275 mateusz.vi 369 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 370 
    uidirty.from = 0;
371 
    uidirty.to = 0xff;
1275 mateusz.vi 372 
  } else {
1316 mateusz.vi 373 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 374 
  }
375 
}
376 
 
377 
 
1327 mateusz.vi 378 
static void cursor_up(struct file *db) {
1275 mateusz.vi 379 
  if (db->cursor->prev != NULL) {
1328 mateusz.vi 380 
    db->curline -= 1;
1275 mateusz.vi 381 
    db->cursor = db->cursor->prev;
1316 mateusz.vi 382 
    if (db->cursorposy == 0) {
1327 mateusz.vi 383 
      uidirty.from = 0;
384 
      uidirty.to = 0xff;
1275 mateusz.vi 385 
    } else {
1316 mateusz.vi 386 
      db->cursorposy -= 1;
1275 mateusz.vi 387 
    }
388 
  }
389 
}
390 
 
391 
 
1327 mateusz.vi 392 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 393 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 394 
  if (db->xoffset > db->cursor->len) {
395 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 396 
    uidirty.from = 0;
397 
    uidirty.to = 0xff;
1282 mateusz.vi 398 
  }
399 
 
400 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
401 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 402 
    uidirty.from = 0;
403 
    uidirty.to = 0xff;
1282 mateusz.vi 404 
  }
1316 mateusz.vi 405 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 406 
}
407 
 
408 
 
1327 mateusz.vi 409 
static void cursor_down(struct file *db) {
1276 mateusz.vi 410 
  if (db->cursor->next != NULL) {
1328 mateusz.vi 411 
    db->curline += 1;
1276 mateusz.vi 412 
    db->cursor = db->cursor->next;
1316 mateusz.vi 413 
    if (db->cursorposy < screenh - 2) {
414 
      db->cursorposy += 1;
1276 mateusz.vi 415 
    } else {
1327 mateusz.vi 416 
      uidirty.from = 0;
417 
      uidirty.to = 0xff;
1276 mateusz.vi 418 
    }
419 
  }
420 
}
421 
 
422 
 
1327 mateusz.vi 423 
static void cursor_left(struct file *db) {
1316 mateusz.vi 424 
  if (db->cursorposx > 0) {
425 
    db->cursorposx -= 1;
1302 mateusz.vi 426 
  } else if (db->xoffset > 0) {
427 
    db->xoffset -= 1;
1327 mateusz.vi 428 
    uidirty.from = 0;
429 
    uidirty.to = 0xff;
1302 mateusz.vi 430 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 431 
    cursor_up(db);
432 
    cursor_eol(db);
1302 mateusz.vi 433 
  }
434 
}
435 
 
436 
 
1327 mateusz.vi 437 
static void cursor_home(struct file *db) {
1316 mateusz.vi 438 
  db->cursorposx = 0;
1282 mateusz.vi 439 
  if (db->xoffset != 0) {
440 
    db->xoffset = 0;
1327 mateusz.vi 441 
    uidirty.from = 0;
442 
    uidirty.to = 0xff;
1282 mateusz.vi 443 
  }
1276 mateusz.vi 444 
}
445 
 
446 
 
1327 mateusz.vi 447 
static void cursor_right(struct file *db) {
1316 mateusz.vi 448 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
449 
    if (db->cursorposx < screenw - 2) {
450 
      db->cursorposx += 1;
1308 mateusz.vi 451 
    } else {
452 
      db->xoffset += 1;
1327 mateusz.vi 453 
      uidirty.from = 0;
454 
      uidirty.to = 0xff;
1308 mateusz.vi 455 
    }
456 
  } else {
1327 mateusz.vi 457 
    cursor_down(db);
458 
    cursor_home(db);
1308 mateusz.vi 459 
  }
460 
}
461 
 
462 
 
1327 mateusz.vi 463 
static void del(struct file *db) {
1316 mateusz.vi 464 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
465 
    _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 466 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 467 
    uidirty.from = db->cursorposy;
468 
    uidirty.to = db->cursorposy;
1330 mateusz.vi 469 
    db->modflag = 1;
1292 mateusz.vi 470 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
471 
    struct line far *nextline = db->cursor->next;
472 
    if (db->cursor->next->len > 0) {
1340 mateusz.vi 473 
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
1337 mateusz.vi 474 
        _fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 475 
        db->cursor->len += db->cursor->next->len;
476 
      }
477 
    }
1340 mateusz.vi 478 
 
1292 mateusz.vi 479 
    db->cursor->next = db->cursor->next->next;
480 
    db->cursor->next->prev = db->cursor;
1340 mateusz.vi 481 
 
1339 mateusz.vi 482 
    line_free(nextline);
1327 mateusz.vi 483 
    uidirty.from = db->cursorposy;
484 
    uidirty.to = 0xff;
1328 mateusz.vi 485 
    db->totlines -= 1;
1330 mateusz.vi 486 
    db->modflag = 1;
1292 mateusz.vi 487 
  }
488 
}
489 
 
490 
 
1327 mateusz.vi 491 
static void bkspc(struct file *db) {
1302 mateusz.vi 492 
 
493 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1316 mateusz.vi 494 
  if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 495 
 
1327 mateusz.vi 496 
  cursor_left(db);
497 
  del(db);
1302 mateusz.vi 498 
}
499 
 
500 
 
1286 mateusz.vi 501 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
502 
 * of argc and argv, saves some 330 bytes of binary size */
503 
static char *parseargv(void) {
504 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
505 
  unsigned char count = 0;
506 
  char *argv[4];
507 
 
508 
  while (count < 4) {
509 
    /* jump to nearest arg */
510 
    while (*tail == ' ') {
511 
      *tail = 0;
512 
      tail++;
513 
    }
514 
 
515 
    if (*tail == '\r') {
516 
      *tail = 0;
517 
      break;
518 
    }
519 
 
520 
    argv[count++] = tail;
521 
 
522 
    /* jump to next delimiter */
523 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
524 
  }
525 
 
526 
  /* check args now */
1321 mateusz.vi 527 
  if (count == 0) return("");
1286 mateusz.vi 528 
 
529 
  return(argv[0]);
530 
}
531 
 
532 
 
1320 mateusz.vi 533 
static struct file *loadfile(const char *fname) {
1324 mateusz.vi 534 
  char buff[512]; /* read one entire sector at a time (faster) */
535 
  char *buffptr;
536 
  unsigned int len, llen;
1287 mateusz.vi 537 
  int fd;
1324 mateusz.vi 538 
  unsigned char eolfound;
1339 mateusz.vi 539 
  static struct file db[1];
1287 mateusz.vi 540 
 
1339 mateusz.vi 541 
  bzero(db, sizeof(db));
542 
  memcpy(db->fname, fname, strlen(fname));
1321 mateusz.vi 543 
 
544 
  if (*fname == 0) goto SKIPLOADING;
545 
 
1287 mateusz.vi 546 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
547 
    mdr_coutraw_puts("Failed to open file:");
548 
    mdr_coutraw_puts(fname);
1320 mateusz.vi 549 
    return(NULL);
1287 mateusz.vi 550 
  }
551 
 
1313 mateusz.vi 552 
  db->lfonly = 1;
553 
 
1324 mateusz.vi 554 
  /* start by adding an empty line */
1328 mateusz.vi 555 
  if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 556 
    /* TODO ERROR HANDLING */
557 
  }
1287 mateusz.vi 558 
 
1324 mateusz.vi 559 
  for (eolfound = 0;;) {
560 
    unsigned short consumedbytes;
561 
 
562 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
563 
    buffptr = buff;
564 
 
565 
    FINDLINE:
566 
 
567 
    /* look for nearest \n */
568 
    for (consumedbytes = 0;; consumedbytes++) {
569 
      if (consumedbytes == len) {
570 
        llen = consumedbytes;
571 
        break;
1323 mateusz.vi 572 
      }
1324 mateusz.vi 573 
      if (buffptr[consumedbytes] == '\r') {
574 
        llen = consumedbytes;
575 
        consumedbytes++;
576 
        db->lfonly = 0;
1320 mateusz.vi 577 
        break;
578 
      }
1324 mateusz.vi 579 
      if (buffptr[consumedbytes] == '\n') {
580 
        eolfound = 1;
581 
        llen = consumedbytes;
582 
        consumedbytes++;
583 
        break;
584 
      }
1287 mateusz.vi 585 
    }
1324 mateusz.vi 586 
 
587 
    /* consumedbytes is the amount of bytes processed from buffptr,
588 
     * llen is the length of line's payload (without its line terminator) */
589 
 
590 
    /* append content, if line is non-empty */
591 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1287 mateusz.vi 592 
      mdr_coutraw_puts("out of memory");
1339 mateusz.vi 593 
      goto IOERR;
1287 mateusz.vi 594 
    }
595 
 
1324 mateusz.vi 596 
    /* add a new line if necessary */
597 
    if (eolfound) {
1328 mateusz.vi 598 
      if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 599 
      /* TODO ERROR HANDLING */
600 
        mdr_coutraw_puts("out of memory");
1339 mateusz.vi 601 
        goto IOERR;
1324 mateusz.vi 602 
      }
603 
      eolfound = 0;
604 
    }
1287 mateusz.vi 605 
 
1324 mateusz.vi 606 
    /* anything left? process the buffer leftover again */
607 
    if (consumedbytes < len) {
608 
      len -= consumedbytes;
609 
      buffptr += consumedbytes;
610 
      goto FINDLINE;
611 
    }
612 
 
613 
  }
614 
 
1287 mateusz.vi 615 
  _dos_close(fd);
616 
 
1321 mateusz.vi 617 
  SKIPLOADING:
618 
 
1320 mateusz.vi 619 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
1339 mateusz.vi 620 
  if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
621 
  db_rewind(db);
1320 mateusz.vi 622 
 
623 
  return(db);
1339 mateusz.vi 624 
 
625 
  IOERR:
626 
  _dos_close(fd);
627 
  return(NULL);
1287 mateusz.vi 628 
}
629 
 
630 
 
1332 mateusz.vi 631 
static int savefile(const struct file *db, const char *newfname) {
1311 mateusz.vi 632 
  int fd;
633 
  const struct line far *l;
634 
  unsigned bytes;
1313 mateusz.vi 635 
  unsigned char eollen;
636 
  unsigned char eolbuf[2];
1332 mateusz.vi 637 
  int errflag = 0;
1313 mateusz.vi 638 
 
1332 mateusz.vi 639 
  /* either create a new file if newfname provided, or... */
640 
  if (newfname) {
641 
    if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
642 
  } else { /* ...open db->fname */
643 
    if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
1311 mateusz.vi 644 
  }
645 
 
646 
  l = db->cursor;
647 
  while (l->prev) l = l->prev;
648 
 
1313 mateusz.vi 649 
  /* preset line terminators */
650 
  if (db->lfonly) {
651 
    eolbuf[0] = '\n';
652 
    eollen = 1;
653 
  } else {
654 
    eolbuf[0] = '\r';
655 
    eolbuf[1] = '\n';
656 
    eollen = 2;
657 
  }
658 
 
1311 mateusz.vi 659 
  while (l) {
1324 mateusz.vi 660 
    /* do not write the last empty line, it is only useful for edition */
661 
    if (l->len != 0) {
1332 mateusz.vi 662 
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
1324 mateusz.vi 663 
    } else if (l->next == NULL) {
664 
      break;
665 
    }
1332 mateusz.vi 666 
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
1311 mateusz.vi 667 
    l = l->next;
668 
  }
669 
 
1332 mateusz.vi 670 
  errflag |= _dos_close(fd);
1330 mateusz.vi 671 
 
1332 mateusz.vi 672 
  return(errflag);
1311 mateusz.vi 673 
}
674 
 
675 
 
1327 mateusz.vi 676 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1340 mateusz.vi 677 
  if (curline_resize(db, db->cursor->len + len) == 0) {
1317 mateusz.vi 678 
    unsigned short off = db->xoffset + db->cursorposx;
1330 mateusz.vi 679 
    db->modflag = 1;
1317 mateusz.vi 680 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
681 
    db->cursor->len += len;
1327 mateusz.vi 682 
    uidirty.from = db->cursorposy;
683 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 684 
    while (len--) {
685 
      db->cursor->payload[off++] = *databuf;
686 
      databuf++;
1327 mateusz.vi 687 
      cursor_right(db);
1317 mateusz.vi 688 
    }
689 
  }
690 
}
691 
 
692 
 
1342 mateusz.vi 693 
static void clear_file(struct file *db) {
694 
 
695 
  /* free the entire linked list of lines */
696 
  db_rewind(db);
697 
  while (db->cursor) {
698 
    struct line far *victim;
699 
    victim = db->cursor;
700 
    db->cursor = db->cursor->next;
701 
    line_free(victim);
702 
  }
703 
 
704 
  /* zero out the struct */
705 
  bzero(db, sizeof(struct file));
706 
 
707 
  /* add a single empty line and rewind */
708 
  line_add(db, NULL, 0);
709 
  db_rewind(db);
710 
}
711 
 
712 
 
1343 mateusz.vi 713 
/* recompute db->curline by counting nodes in linked list */
714 
static void recompute_curline(struct file *db) {
715 
  const struct line far *l = db->cursor;
716 
 
717 
  db->curline = 0;
718 
  while (l->prev != NULL) {
719 
    db->curline += 1;
720 
    l = l->prev;
721 
  }
722 
}
723 
 
724 
 
1286 mateusz.vi 725 
int main(void) {
726 
  const char *fname;
1320 mateusz.vi 727 
  struct file *db;
1275 mateusz.vi 728 
 
1307 mateusz.vi 729 
  {
730 
    char nlspath[128], lang[8];
731 
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
732 
  }
1282 mateusz.vi 733 
 
1286 mateusz.vi 734 
  fname = parseargv();
735 
 
736 
  if (fname == NULL) {
1302 mateusz.vi 737 
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
1275 mateusz.vi 738 
    return(0);
739 
  }
740 
 
1282 mateusz.vi 741 
  /* load file */
1320 mateusz.vi 742 
  db = loadfile(fname);
743 
  if (db == NULL) return(1);
1282 mateusz.vi 744 
 
1333 mateusz.vi 745 
  if (mdr_cout_init(&screenw, &screenh)) {
746 
    /* load color scheme if mdr_cout_init returns a color flag */
747 
    SCHEME_TEXT = 0x17;
748 
    SCHEME_STBAR1 = 0x70;
749 
    SCHEME_STBAR2 = 0x78;
750 
    SCHEME_STBAR3 = 0xf0;
751 
    SCHEME_SCROLL = 0x70;
752 
    SCHEME_MSG = 0xf0;
753 
    SCHEME_ERR = 0x4f;
754 
  }
1275 mateusz.vi 755 
 
756 
  for (;;) {
757 
    int k;
758 
 
1327 mateusz.vi 759 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 760 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 761 
 
1327 mateusz.vi 762 
    if (uidirty.from != 0xff) {
763 
      ui_refresh(db);
764 
      uidirty.from = 0xff;
1282 mateusz.vi 765 
    }
1342 mateusz.vi 766 
    if (uidirty.statusbar) {
767 
      ui_basic(db);
768 
      uidirty.statusbar = 0;
769 
    }
1328 mateusz.vi 770 
#ifdef DBG_LINENUM
771 
      {
772 
        char ddd[10];
773 
        db->curline += 1;
774 
        ddd[0] = '0' + db->curline / 100;
775 
        ddd[1] = '0' + (db->curline % 100) / 10;
776 
        ddd[2] = '0' + (db->curline % 10);
777 
        db->curline -= 1;
778 
        ddd[3] = '/';
779 
        ddd[4] = '0' + db->totlines / 100;
780 
        ddd[5] = '0' + (db->totlines % 100) / 10;
781 
        ddd[6] = '0' + (db->totlines % 10);
782 
        ddd[7] = 0;
1333 mateusz.vi 783 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 784 
      }
785 
#endif
1275 mateusz.vi 786 
 
787 
    k = keyb_getkey();
1282 mateusz.vi 788 
 
1275 mateusz.vi 789 
    if (k == 0x150) { /* down */
1327 mateusz.vi 790 
      cursor_down(db);
1275 mateusz.vi 791 
 
792 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 793 
      cursor_up(db);
1275 mateusz.vi 794 
 
795 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 796 
      cursor_right(db);
1275 mateusz.vi 797 
 
798 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 799 
      cursor_left(db);
1275 mateusz.vi 800 
 
1282 mateusz.vi 801 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 802 
      unsigned char dist = db->cursorposy + screenh - 1;
803 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
804 
        db->cursor = db->cursor->prev;
805 
        dist--;
806 
      }
807 
      if (dist != 0) {
808 
        db->cursorposy = 0;
809 
        db->cursorposx = 0;
810 
      } else {
811 
        dist = db->cursorposy;
812 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
813 
      }
814 
      uidirty.from = 0;
815 
      uidirty.to = 0xff;
1343 mateusz.vi 816 
      recompute_curline(db);
1282 mateusz.vi 817 
 
818 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 819 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
820 
      while ((dist != 0) && (db->cursor->next != NULL)) {
821 
        db->cursor = db->cursor->next;
822 
        dist--;
823 
      }
824 
      if (dist != 0) {
825 
        db->cursorposy = screenh - 2;
826 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
827 
        db->cursorposx = 0;
828 
      } else {
829 
        dist = screenh - 2 - db->cursorposy;
830 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
831 
      }
832 
      uidirty.from = 0;
833 
      uidirty.to = 0xff;
1343 mateusz.vi 834 
      recompute_curline(db);
1282 mateusz.vi 835 
 
836 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 837 
       cursor_home(db);
1282 mateusz.vi 838 
 
839 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 840 
       cursor_eol(db);
1282 mateusz.vi 841 
 
1275 mateusz.vi 842 
    } else if (k == 0x1B) { /* ESC */
1342 mateusz.vi 843 
      if (ui_confirm_if_unsaved(db) == 0) break;
1275 mateusz.vi 844 
 
1289 mateusz.vi 845 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 846 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 847 
      /* add a new line */
1328 mateusz.vi 848 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1330 mateusz.vi 849 
        db->modflag = 1;
1328 mateusz.vi 850 
        db->cursor = db->cursor->prev; /* back to original line */
1289 mateusz.vi 851 
        /* trim the line above */
1328 mateusz.vi 852 
        db->cursor->len = off;
1289 mateusz.vi 853 
        /* move cursor to the (new) line below */
1343 mateusz.vi 854 
        db->curline -= 1;
1328 mateusz.vi 855 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 856 
        uidirty.to = 0xff;
1328 mateusz.vi 857 
        cursor_down(db);
858 
        cursor_home(db);
1289 mateusz.vi 859 
      } else {
860 
        /* ERROR: OUT OF MEMORY */
861 
      }
862 
 
1292 mateusz.vi 863 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 864 
      del(db);
1292 mateusz.vi 865 
 
1302 mateusz.vi 866 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 867 
      bkspc(db);
1302 mateusz.vi 868 
 
1308 mateusz.vi 869 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 870 
      char c = k;
1327 mateusz.vi 871 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 872 
 
1317 mateusz.vi 873 
    } else if (k == 0x009) { /* TAB */
874 
      const char *tab = "        ";
1327 mateusz.vi 875 
      insert_in_line(db, tab, 8);
1317 mateusz.vi 876 
 
1309 mateusz.vi 877 
    } else if (k == 0x13b) { /* F1 */
1326 mateusz.vi 878 
      ui_help();
1327 mateusz.vi 879 
      uidirty.from = 0;
880 
      uidirty.to = 0xff;
1309 mateusz.vi 881 
 
1342 mateusz.vi 882 
    } else if (k == 0x13c) { /* F2 (new file) */
883 
      if (ui_confirm_if_unsaved(db) == 0) clear_file(db);
884 
      uidirty.from = 0;
885 
      uidirty.to = 0xff;
886 
      uidirty.statusbar = 1;
887 
 
1332 mateusz.vi 888 
    } else if ((k == 0x13f) || (k == 0x140)) { /* F5 or F6 */
889 
      int saveres;
890 
 
891 
      if ((k == 0x140) || (db->fname[0] == 0)) { /* save as... */
892 
        char fname[25];
893 
        ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
894 
        if (*fname == 0) continue;
895 
        saveres = savefile(db, fname);
896 
        if (saveres == 0) memcpy(db->fname, fname, sizeof(fname));
897 
      } else {
898 
        saveres = savefile(db, NULL);
899 
      }
900 
 
901 
      if (saveres == 0) {
1330 mateusz.vi 902 
        db->modflag = 0;
1333 mateusz.vi 903 
        ui_msg(svarlang_str(0, 2), NULL, SCHEME_MSG);
1322 mateusz.vi 904 
        mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
905 
      } else {
1333 mateusz.vi 906 
        ui_msg(svarlang_str(0, 3), NULL, SCHEME_ERR);
1322 mateusz.vi 907 
        mdr_bios_tickswait(36); /* 2s */
908 
      }
1311 mateusz.vi 909 
 
1332 mateusz.vi 910 
      ui_refresh(db);
1342 mateusz.vi 911 
      uidirty.statusbar = 1;
1332 mateusz.vi 912 
 
1314 mateusz.vi 913 
    } else if (k == 0x144) { /* F10 */
1330 mateusz.vi 914 
      db->modflag = 1;
1320 mateusz.vi 915 
      db->lfonly ^= 1;
1342 mateusz.vi 916 
      uidirty.statusbar = 1;
1314 mateusz.vi 917 
 
1325 mateusz.vi 918 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
919 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
920 
      for (;;) {
921 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
922 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 923 
        cursor_right(db);
1325 mateusz.vi 924 
      }
925 
      /* now skip to next non-space or end of file */
926 
      for (;;) {
1327 mateusz.vi 927 
        cursor_right(db);
1325 mateusz.vi 928 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
929 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
930 
      }
931 
 
932 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 933 
      cursor_left(db);
1325 mateusz.vi 934 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
935 
      for (;;) {
936 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
937 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 938 
        cursor_left(db);
1325 mateusz.vi 939 
      }
940 
      /* now skip to next space or start of file */
941 
      for (;;) {
1327 mateusz.vi 942 
        cursor_left(db);
1325 mateusz.vi 943 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 944 
          cursor_right(db);
1325 mateusz.vi 945 
          break;
946 
        }
947 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
948 
      }
949 
 
1333 mateusz.vi 950 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 951 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
952 
      char buff[4];
953 
      const char *HEX = "0123456789ABCDEF";
954 
      buff[0] = HEX[(k >> 8) & 15];
955 
      buff[1] = HEX[(k >> 4) & 15];
956 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 957 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
958 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1275 mateusz.vi 959 
      keyb_getkey();
960 
      break;
1333 mateusz.vi 961 
#endif
1275 mateusz.vi 962 
    }
963 
  }
964 
 
965 
  mdr_cout_close();
966 
 
1320 mateusz.vi 967 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 968 
 
969 
  return(0);
970 
}