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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;
57 
} uidirty = {0, 0xff}; /* make sure to redraw entire UI at first run */
58 
 
1275 mateusz.vi 59 
#define SCROLL_CURSOR 0xB1
60 
 
61 
struct line {
1288 mateusz.vi 62 
  struct line far *prev;
63 
  struct line far *next;
1275 mateusz.vi 64 
  unsigned short len;
65 
  char payload[1];
66 
};
67 
 
1315 mateusz.vi 68 
struct file {
1320 mateusz.vi 69 
  int fd;
1288 mateusz.vi 70 
  struct line far *cursor;
1275 mateusz.vi 71 
  unsigned short xoffset;
1316 mateusz.vi 72 
  unsigned char cursorposx;
73 
  unsigned char cursorposy;
1328 mateusz.vi 74 
  unsigned short totlines;
75 
  unsigned short curline;
1330 mateusz.vi 76 
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
77 
  char modflag;  /* non-zero if file has been modified since last save */
1332 mateusz.vi 78 
  char fname[128];
1275 mateusz.vi 79 
};
80 
 
81 
 
1326 mateusz.vi 82 
/*****************************************************************************
83 
 * functions                                                                 *
84 
 *****************************************************************************/
85 
 
1339 mateusz.vi 86 
static struct line far *line_calloc(unsigned short siz) {
87 
  unsigned int seg;
88 
  if (_dos_allocmem((sizeof(struct line) + siz) / 16 + 1, &seg) != 0) return(NULL);
89 
  _fmemset(MK_FP(seg, 0), 0, siz);
90 
  return(MK_FP(seg, 0));
91 
}
92 
 
93 
 
94 
static void line_free(struct line far *ptr) {
95 
  _dos_freemem(FP_SEG(ptr));
96 
}
97 
 
98 
 
99 
static struct line far *line_resize(struct line far *ptr, unsigned short newsiz) {
100 
  unsigned int maxavail;
101 
  struct line far *newptr;
102 
 
103 
  /* try resizing the block (faster) */
104 
  if (_dos_setblock((sizeof(struct line) + newsiz) / 16 + 1, FP_SEG(ptr), &maxavail) == 0) return(ptr);
105 
 
106 
  /* create a new block and copy data over */
107 
  newptr = line_calloc(newsiz);
108 
  if (newptr == NULL) return(NULL);
109 
  _fmemmove(newptr, ptr, sizeof(struct line) + ptr->len);
110 
  return(newptr);
111 
}
112 
 
113 
 
1328 mateusz.vi 114 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 115 
 * returns non-zero on error */
1328 mateusz.vi 116 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 117 
  struct line far *l;
1275 mateusz.vi 118 
 
1339 mateusz.vi 119 
  l = line_calloc(slen);
1287 mateusz.vi 120 
  if (l == NULL) return(-1);
121 
 
1275 mateusz.vi 122 
  l->prev = db->cursor;
123 
  if (db->cursor) {
124 
    l->next = db->cursor->next;
125 
    db->cursor->next = l;
126 
    l->next->prev = l;
127 
  }
128 
  db->cursor = l;
1337 mateusz.vi 129 
  _fmemmove(l->payload, line, slen);
1275 mateusz.vi 130 
  l->len = slen;
1287 mateusz.vi 131 
 
1328 mateusz.vi 132 
  db->totlines += 1;
133 
  db->curline += 1;
134 
 
1287 mateusz.vi 135 
  return(0);
1275 mateusz.vi 136 
}
137 
 
138 
 
1332 mateusz.vi 139 
static void ui_getstring(const char *query, char *s, unsigned char maxlen) {
140 
  unsigned char len = 0, y, x;
141 
  int k;
142 
 
143 
  if (maxlen == 0) return;
144 
  maxlen--; /* make room for the nul terminator */
145 
 
146 
  y = screenh - 1;
147 
 
148 
  /* print query string */
1333 mateusz.vi 149 
  x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);
150 
  mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 151 
 
152 
  for (;;) {
153 
    mdr_cout_locate(y, x + len);
154 
    k = keyb_getkey();
155 
 
156 
    if (k == 0x1b) return; /* ESC */
157 
 
158 
    if (k == '\r') {
159 
      s[len] = 0;
160 
      return;
161 
    }
162 
 
163 
    if ((k == 0x08) && (len > 0)) { /* BKSPC */
164 
      len--;
1333 mateusz.vi 165 
      mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);
1332 mateusz.vi 166 
      continue;
167 
    }
168 
 
169 
    if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
1333 mateusz.vi 170 
      mdr_cout_char(y, x + len, k, SCHEME_STBAR3);
1332 mateusz.vi 171 
      s[len++] = k;
172 
    }
173 
 
174 
  }
175 
}
176 
 
177 
 
1324 mateusz.vi 178 
/* append a nul-terminated string to line at cursor position */
179 
static int line_append(struct file *f, const char far *buf, unsigned short len) {
180 
  struct line far *n;
181 
  if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */
1339 mateusz.vi 182 
  n = line_resize(f->cursor, f->cursor->len + len);
1324 mateusz.vi 183 
  if (n == NULL) return(-1);
184 
  f->cursor = n;
1337 mateusz.vi 185 
  _fmemmove(f->cursor->payload + f->cursor->len, buf, len);
1324 mateusz.vi 186 
  f->cursor->len += len;
187 
 
188 
  /* rewire the linked list */
189 
  if (f->cursor->next) f->cursor->next->prev = f->cursor;
190 
  if (f->cursor->prev) f->cursor->prev->next = f->cursor;
191 
 
192 
  return(0);
193 
}
194 
 
195 
 
1315 mateusz.vi 196 
static void db_rewind(struct file *db) {
1275 mateusz.vi 197 
  if (db->cursor == NULL) return;
198 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 199 
  db->curline = 0;
1275 mateusz.vi 200 
}
201 
 
202 
 
1326 mateusz.vi 203 
static void ui_basic(const struct file *db) {
1302 mateusz.vi 204 
  const char *s = svarlang_strid(0); /* HELP */
1335 mateusz.vi 205 
  unsigned char helpcol = screenw - strlen(s);
1275 mateusz.vi 206 
 
1330 mateusz.vi 207 
  /* fill status bar with background (without modflag as it is refreshed by ui_refresh) */
1333 mateusz.vi 208 
  mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);
1313 mateusz.vi 209 
 
210 
  /* filename */
1330 mateusz.vi 211 
  {
212 
    const char *fn = db->fname;
213 
    if (*fn == 0) fn = svarlang_str(0, 1);
1333 mateusz.vi 214 
    mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);
1321 mateusz.vi 215 
  }
1313 mateusz.vi 216 
 
217 
  /* eol type */
1330 mateusz.vi 218 
  {
219 
    const char *eoltype = "CRLF";
220 
    if (db->lfonly) eoltype = "LF";
1335 mateusz.vi 221 
    mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 222 
  }
1313 mateusz.vi 223 
 
1335 mateusz.vi 224 
  mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 225 
}
226 
 
227 
 
1331 mateusz.vi 228 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
1312 mateusz.vi 229 
  unsigned short x, y, msglen, i;
1331 mateusz.vi 230 
  unsigned char msg2flag = 0;
231 
 
232 
  msglen = strlen(msg1);
233 
  if (msg2) {
234 
    msg2flag = 1;
235 
    i = strlen(msg2);
236 
    if (i > msglen) msglen = i;
237 
  }
238 
 
239 
  y = (screenh - 6) >> 1;
1312 mateusz.vi 240 
  x = (screenw - msglen - 4) >> 1;
1331 mateusz.vi 241 
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
242 
  x++;
243 
  mdr_cout_str(y+1, x, msg1, attr, msglen);
244 
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
1312 mateusz.vi 245 
 
1327 mateusz.vi 246 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 247 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 248 
}
249 
 
250 
 
1326 mateusz.vi 251 
static void ui_help(void) {
1309 mateusz.vi 252 
#define MAXLINLEN 35
1336 mateusz.vi 253 
  unsigned char i, offset;
1325 mateusz.vi 254 
  offset = (screenw - MAXLINLEN + 2) >> 1;
1335 mateusz.vi 255 
 
256 
  for (i = 2; i < 18; i++) {
1333 mateusz.vi 257 
    mdr_cout_char_rep(i, offset - 2, ' ', SCHEME_STBAR1, MAXLINLEN + 2);
1309 mateusz.vi 258 
  }
259 
 
1335 mateusz.vi 260 
  for (i = 0; i < 20; i++) {
1337 mateusz.vi 261 
    const char *s = svarlang_str(8, i);
1335 mateusz.vi 262 
    if (s[0] == 0) break;
263 
    if (s[0] == '.') continue;
1336 mateusz.vi 264 
    mdr_cout_locate(3 + i, offset + mdr_cout_str(3 + i, offset, s, SCHEME_STBAR1, MAXLINLEN));
1309 mateusz.vi 265 
  }
266 
 
267 
  keyb_getkey();
268 
#undef MAXLINLEN
269 
}
270 
 
271 
 
1327 mateusz.vi 272 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 273 
  unsigned char x;
1310 mateusz.vi 274 
  const struct line far *l;
1316 mateusz.vi 275 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 276 
 
1288 mateusz.vi 277 
#ifdef DBG_REFRESH
1282 mateusz.vi 278 
  static char m = 'a';
279 
  m++;
280 
  if (m > 'z') m = 'a';
1288 mateusz.vi 281 
#endif
1282 mateusz.vi 282 
 
1310 mateusz.vi 283 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 284 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 285 
 
1310 mateusz.vi 286 
  /* iterate over lines and redraw whatever needs to be redrawn */
287 
  for (; l != NULL; l = l->next, y++) {
288 
 
289 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 290 
    if (y < uidirty.from) continue;
291 
    if (y > uidirty.to) break;
1282 mateusz.vi 292 
 
1318 mateusz.vi 293 
    x = 0;
1275 mateusz.vi 294 
    if (db->xoffset < l->len) {
1318 mateusz.vi 295 
      unsigned char i, limit;
296 
      if (l->len - db->xoffset < screenw) {
297 
        limit = l->len;
298 
      } else {
299 
        limit = db->xoffset + screenw - 1;
300 
      }
1333 mateusz.vi 301 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 302 
    }
1282 mateusz.vi 303 
 
1318 mateusz.vi 304 
    /* write empty spaces until end of line */
1333 mateusz.vi 305 
    if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);
1318 mateusz.vi 306 
 
1288 mateusz.vi 307 
#ifdef DBG_REFRESH
1333 mateusz.vi 308 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 309 
#endif
1282 mateusz.vi 310 
 
1275 mateusz.vi 311 
    if (y == screenh - 2) break;
312 
  }
1310 mateusz.vi 313 
 
1319 mateusz.vi 314 
  /* fill all lines below if empty (and they need to be redrawn) */
315 
  if (l == NULL) {
1327 mateusz.vi 316 
    while ((y < screenh - 1) && (y < uidirty.to)) {
1333 mateusz.vi 317 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);
1319 mateusz.vi 318 
    }
1318 mateusz.vi 319 
  }
1328 mateusz.vi 320 
 
1330 mateusz.vi 321 
  /* "file changed" flag */
322 
  {
323 
    char flg = ' ';
324 
    if (db->modflag) flg = '*';
1333 mateusz.vi 325 
    mdr_cout_char(screenh - 1, 0, flg, SCHEME_STBAR1);
1330 mateusz.vi 326 
  }
327 
 
1328 mateusz.vi 328 
  /* scroll bar */
329 
  for (y = 0; y < (screenh - 1); y++) {
1333 mateusz.vi 330 
    mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 331 
  }
332 
 
333 
  /* scroll cursor */
334 
  if (db->totlines >= screenh) {
335 
    unsigned short topline = db->curline - db->cursorposy;
336 
    unsigned short col;
337 
    unsigned short totlines = db->totlines - screenh + 1;
338 
    if (db->totlines - screenh > screenh) {
339 
      col = topline / (totlines / (screenh - 1));
340 
    } else {
341 
      col = topline * (screenh - 1) / totlines;
342 
    }
343 
    if (col >= screenh - 1) col = screenh - 2;
1333 mateusz.vi 344 
    mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);
1328 mateusz.vi 345 
  }
1275 mateusz.vi 346 
}
347 
 
348 
 
1327 mateusz.vi 349 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 350 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 351 
 
352 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 353 
    db->cursorposx = 0;
1275 mateusz.vi 354 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 355 
    uidirty.from = 0;
356 
    uidirty.to = 0xff;
1275 mateusz.vi 357 
  } else {
1316 mateusz.vi 358 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 359 
  }
360 
}
361 
 
362 
 
1327 mateusz.vi 363 
static void cursor_up(struct file *db) {
1275 mateusz.vi 364 
  if (db->cursor->prev != NULL) {
1328 mateusz.vi 365 
    db->curline -= 1;
1275 mateusz.vi 366 
    db->cursor = db->cursor->prev;
1316 mateusz.vi 367 
    if (db->cursorposy == 0) {
1327 mateusz.vi 368 
      uidirty.from = 0;
369 
      uidirty.to = 0xff;
1275 mateusz.vi 370 
    } else {
1316 mateusz.vi 371 
      db->cursorposy -= 1;
1275 mateusz.vi 372 
    }
373 
  }
374 
}
375 
 
376 
 
1327 mateusz.vi 377 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 378 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 379 
  if (db->xoffset > db->cursor->len) {
380 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 381 
    uidirty.from = 0;
382 
    uidirty.to = 0xff;
1282 mateusz.vi 383 
  }
384 
 
385 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
386 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 387 
    uidirty.from = 0;
388 
    uidirty.to = 0xff;
1282 mateusz.vi 389 
  }
1316 mateusz.vi 390 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 391 
}
392 
 
393 
 
1327 mateusz.vi 394 
static void cursor_down(struct file *db) {
1276 mateusz.vi 395 
  if (db->cursor->next != NULL) {
1328 mateusz.vi 396 
    db->curline += 1;
1276 mateusz.vi 397 
    db->cursor = db->cursor->next;
1316 mateusz.vi 398 
    if (db->cursorposy < screenh - 2) {
399 
      db->cursorposy += 1;
1276 mateusz.vi 400 
    } else {
1327 mateusz.vi 401 
      uidirty.from = 0;
402 
      uidirty.to = 0xff;
1276 mateusz.vi 403 
    }
404 
  }
405 
}
406 
 
407 
 
1327 mateusz.vi 408 
static void cursor_left(struct file *db) {
1316 mateusz.vi 409 
  if (db->cursorposx > 0) {
410 
    db->cursorposx -= 1;
1302 mateusz.vi 411 
  } else if (db->xoffset > 0) {
412 
    db->xoffset -= 1;
1327 mateusz.vi 413 
    uidirty.from = 0;
414 
    uidirty.to = 0xff;
1302 mateusz.vi 415 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 416 
    cursor_up(db);
417 
    cursor_eol(db);
1302 mateusz.vi 418 
  }
419 
}
420 
 
421 
 
1327 mateusz.vi 422 
static void cursor_home(struct file *db) {
1316 mateusz.vi 423 
  db->cursorposx = 0;
1282 mateusz.vi 424 
  if (db->xoffset != 0) {
425 
    db->xoffset = 0;
1327 mateusz.vi 426 
    uidirty.from = 0;
427 
    uidirty.to = 0xff;
1282 mateusz.vi 428 
  }
1276 mateusz.vi 429 
}
430 
 
431 
 
1327 mateusz.vi 432 
static void cursor_right(struct file *db) {
1316 mateusz.vi 433 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
434 
    if (db->cursorposx < screenw - 2) {
435 
      db->cursorposx += 1;
1308 mateusz.vi 436 
    } else {
437 
      db->xoffset += 1;
1327 mateusz.vi 438 
      uidirty.from = 0;
439 
      uidirty.to = 0xff;
1308 mateusz.vi 440 
    }
441 
  } else {
1327 mateusz.vi 442 
    cursor_down(db);
443 
    cursor_home(db);
1308 mateusz.vi 444 
  }
445 
}
446 
 
447 
 
1327 mateusz.vi 448 
static void del(struct file *db) {
1316 mateusz.vi 449 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
450 
    _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 451 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 452 
    uidirty.from = db->cursorposy;
453 
    uidirty.to = db->cursorposy;
1330 mateusz.vi 454 
    db->modflag = 1;
1292 mateusz.vi 455 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
456 
    struct line far *nextline = db->cursor->next;
457 
    if (db->cursor->next->len > 0) {
1339 mateusz.vi 458 
      void far *newptr = line_resize(db->cursor, db->cursor->len + db->cursor->next->len + 1);
1292 mateusz.vi 459 
      if (newptr != NULL) {
460 
        db->cursor = newptr;
1337 mateusz.vi 461 
        _fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 462 
        db->cursor->len += db->cursor->next->len;
463 
      }
464 
    }
465 
    db->cursor->next = db->cursor->next->next;
466 
    db->cursor->next->prev = db->cursor;
467 
    if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
1339 mateusz.vi 468 
    line_free(nextline);
1327 mateusz.vi 469 
    uidirty.from = db->cursorposy;
470 
    uidirty.to = 0xff;
1328 mateusz.vi 471 
    db->totlines -= 1;
1330 mateusz.vi 472 
    db->modflag = 1;
1292 mateusz.vi 473 
  }
474 
}
475 
 
476 
 
1327 mateusz.vi 477 
static void bkspc(struct file *db) {
1302 mateusz.vi 478 
 
479 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1316 mateusz.vi 480 
  if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 481 
 
1327 mateusz.vi 482 
  cursor_left(db);
483 
  del(db);
1302 mateusz.vi 484 
}
485 
 
486 
 
1286 mateusz.vi 487 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
488 
 * of argc and argv, saves some 330 bytes of binary size */
489 
static char *parseargv(void) {
490 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
491 
  unsigned char count = 0;
492 
  char *argv[4];
493 
 
494 
  while (count < 4) {
495 
    /* jump to nearest arg */
496 
    while (*tail == ' ') {
497 
      *tail = 0;
498 
      tail++;
499 
    }
500 
 
501 
    if (*tail == '\r') {
502 
      *tail = 0;
503 
      break;
504 
    }
505 
 
506 
    argv[count++] = tail;
507 
 
508 
    /* jump to next delimiter */
509 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
510 
  }
511 
 
512 
  /* check args now */
1321 mateusz.vi 513 
  if (count == 0) return("");
1286 mateusz.vi 514 
 
515 
  return(argv[0]);
516 
}
517 
 
518 
 
1320 mateusz.vi 519 
static struct file *loadfile(const char *fname) {
1324 mateusz.vi 520 
  char buff[512]; /* read one entire sector at a time (faster) */
521 
  char *buffptr;
522 
  unsigned int len, llen;
1287 mateusz.vi 523 
  int fd;
1324 mateusz.vi 524 
  unsigned char eolfound;
1339 mateusz.vi 525 
  static struct file db[1];
1287 mateusz.vi 526 
 
1339 mateusz.vi 527 
  bzero(db, sizeof(db));
528 
  memcpy(db->fname, fname, strlen(fname));
1321 mateusz.vi 529 
 
530 
  if (*fname == 0) goto SKIPLOADING;
531 
 
1287 mateusz.vi 532 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
533 
    mdr_coutraw_puts("Failed to open file:");
534 
    mdr_coutraw_puts(fname);
1320 mateusz.vi 535 
    return(NULL);
1287 mateusz.vi 536 
  }
537 
 
1313 mateusz.vi 538 
  db->lfonly = 1;
539 
 
1324 mateusz.vi 540 
  /* start by adding an empty line */
1328 mateusz.vi 541 
  if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 542 
    /* TODO ERROR HANDLING */
543 
  }
1287 mateusz.vi 544 
 
1324 mateusz.vi 545 
  for (eolfound = 0;;) {
546 
    unsigned short consumedbytes;
547 
 
548 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
549 
    buffptr = buff;
550 
 
551 
    FINDLINE:
552 
 
553 
    /* look for nearest \n */
554 
    for (consumedbytes = 0;; consumedbytes++) {
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)) {
1287 mateusz.vi 578 
      mdr_coutraw_puts("out of memory");
1339 mateusz.vi 579 
      goto IOERR;
1287 mateusz.vi 580 
    }
581 
 
1324 mateusz.vi 582 
    /* add a new line if necessary */
583 
    if (eolfound) {
1328 mateusz.vi 584 
      if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 585 
      /* TODO ERROR HANDLING */
586 
        mdr_coutraw_puts("out of memory");
1339 mateusz.vi 587 
        goto IOERR;
1324 mateusz.vi 588 
      }
589 
      eolfound = 0;
590 
    }
1287 mateusz.vi 591 
 
1324 mateusz.vi 592 
    /* anything left? process the buffer leftover again */
593 
    if (consumedbytes < len) {
594 
      len -= consumedbytes;
595 
      buffptr += consumedbytes;
596 
      goto FINDLINE;
597 
    }
598 
 
599 
  }
600 
 
1287 mateusz.vi 601 
  _dos_close(fd);
602 
 
1321 mateusz.vi 603 
  SKIPLOADING:
604 
 
1320 mateusz.vi 605 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
1339 mateusz.vi 606 
  if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
607 
  db_rewind(db);
1320 mateusz.vi 608 
 
609 
  return(db);
1339 mateusz.vi 610 
 
611 
  IOERR:
612 
  _dos_close(fd);
613 
  return(NULL);
1287 mateusz.vi 614 
}
615 
 
616 
 
1332 mateusz.vi 617 
static int savefile(const struct file *db, const char *newfname) {
1311 mateusz.vi 618 
  int fd;
619 
  const struct line far *l;
620 
  unsigned bytes;
1313 mateusz.vi 621 
  unsigned char eollen;
622 
  unsigned char eolbuf[2];
1332 mateusz.vi 623 
  int errflag = 0;
1313 mateusz.vi 624 
 
1332 mateusz.vi 625 
  /* either create a new file if newfname provided, or... */
626 
  if (newfname) {
627 
    if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
628 
  } else { /* ...open db->fname */
629 
    if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
1311 mateusz.vi 630 
  }
631 
 
632 
  l = db->cursor;
633 
  while (l->prev) l = l->prev;
634 
 
1313 mateusz.vi 635 
  /* preset line terminators */
636 
  if (db->lfonly) {
637 
    eolbuf[0] = '\n';
638 
    eollen = 1;
639 
  } else {
640 
    eolbuf[0] = '\r';
641 
    eolbuf[1] = '\n';
642 
    eollen = 2;
643 
  }
644 
 
1311 mateusz.vi 645 
  while (l) {
1324 mateusz.vi 646 
    /* do not write the last empty line, it is only useful for edition */
647 
    if (l->len != 0) {
1332 mateusz.vi 648 
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
1324 mateusz.vi 649 
    } else if (l->next == NULL) {
650 
      break;
651 
    }
1332 mateusz.vi 652 
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
1311 mateusz.vi 653 
    l = l->next;
654 
  }
655 
 
1332 mateusz.vi 656 
  errflag |= _dos_close(fd);
1330 mateusz.vi 657 
 
1332 mateusz.vi 658 
  return(errflag);
1311 mateusz.vi 659 
}
660 
 
661 
 
1327 mateusz.vi 662 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1317 mateusz.vi 663 
  struct line far *n;
1339 mateusz.vi 664 
  n = line_resize(db->cursor, db->cursor->len + len);
1317 mateusz.vi 665 
  if (n != NULL) {
666 
    unsigned short off = db->xoffset + db->cursorposx;
1330 mateusz.vi 667 
    db->modflag = 1;
1317 mateusz.vi 668 
    if (n->prev) n->prev->next = n;
669 
    if (n->next) n->next->prev = n;
670 
    db->cursor = n;
671 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
672 
    db->cursor->len += len;
1327 mateusz.vi 673 
    uidirty.from = db->cursorposy;
674 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 675 
    while (len--) {
676 
      db->cursor->payload[off++] = *databuf;
677 
      databuf++;
1327 mateusz.vi 678 
      cursor_right(db);
1317 mateusz.vi 679 
    }
680 
  }
681 
}
682 
 
683 
 
1286 mateusz.vi 684 
int main(void) {
685 
  const char *fname;
1320 mateusz.vi 686 
  struct file *db;
1275 mateusz.vi 687 
 
1307 mateusz.vi 688 
  {
689 
    char nlspath[128], lang[8];
690 
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
691 
  }
1282 mateusz.vi 692 
 
1286 mateusz.vi 693 
  fname = parseargv();
694 
 
695 
  if (fname == NULL) {
1302 mateusz.vi 696 
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
1275 mateusz.vi 697 
    return(0);
698 
  }
699 
 
1282 mateusz.vi 700 
  /* load file */
1320 mateusz.vi 701 
  db = loadfile(fname);
702 
  if (db == NULL) return(1);
1282 mateusz.vi 703 
 
1333 mateusz.vi 704 
  if (mdr_cout_init(&screenw, &screenh)) {
705 
    /* load color scheme if mdr_cout_init returns a color flag */
706 
    SCHEME_TEXT = 0x17;
707 
    SCHEME_STBAR1 = 0x70;
708 
    SCHEME_STBAR2 = 0x78;
709 
    SCHEME_STBAR3 = 0xf0;
710 
    SCHEME_SCROLL = 0x70;
711 
    SCHEME_MSG = 0xf0;
712 
    SCHEME_ERR = 0x4f;
713 
  }
1326 mateusz.vi 714 
  ui_basic(db);
1275 mateusz.vi 715 
 
716 
  for (;;) {
717 
    int k;
718 
 
1327 mateusz.vi 719 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 720 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 721 
 
1327 mateusz.vi 722 
    if (uidirty.from != 0xff) {
723 
      ui_refresh(db);
724 
      uidirty.from = 0xff;
1282 mateusz.vi 725 
    }
1328 mateusz.vi 726 
#ifdef DBG_LINENUM
727 
      {
728 
        char ddd[10];
729 
        db->curline += 1;
730 
        ddd[0] = '0' + db->curline / 100;
731 
        ddd[1] = '0' + (db->curline % 100) / 10;
732 
        ddd[2] = '0' + (db->curline % 10);
733 
        db->curline -= 1;
734 
        ddd[3] = '/';
735 
        ddd[4] = '0' + db->totlines / 100;
736 
        ddd[5] = '0' + (db->totlines % 100) / 10;
737 
        ddd[6] = '0' + (db->totlines % 10);
738 
        ddd[7] = 0;
1333 mateusz.vi 739 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 740 
      }
741 
#endif
1275 mateusz.vi 742 
 
743 
    k = keyb_getkey();
1282 mateusz.vi 744 
 
1275 mateusz.vi 745 
    if (k == 0x150) { /* down */
1327 mateusz.vi 746 
      cursor_down(db);
1275 mateusz.vi 747 
 
748 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 749 
      cursor_up(db);
1275 mateusz.vi 750 
 
751 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 752 
      cursor_right(db);
1275 mateusz.vi 753 
 
754 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 755 
      cursor_left(db);
1275 mateusz.vi 756 
 
1282 mateusz.vi 757 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 758 
      unsigned char dist = db->cursorposy + screenh - 1;
759 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
760 
        db->cursor = db->cursor->prev;
761 
        dist--;
762 
      }
763 
      if (dist != 0) {
764 
        db->cursorposy = 0;
765 
        db->cursorposx = 0;
766 
      } else {
767 
        dist = db->cursorposy;
768 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
769 
      }
770 
      uidirty.from = 0;
771 
      uidirty.to = 0xff;
1282 mateusz.vi 772 
 
773 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 774 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
775 
      while ((dist != 0) && (db->cursor->next != NULL)) {
776 
        db->cursor = db->cursor->next;
777 
        dist--;
778 
      }
779 
      if (dist != 0) {
780 
        db->cursorposy = screenh - 2;
781 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
782 
        db->cursorposx = 0;
783 
      } else {
784 
        dist = screenh - 2 - db->cursorposy;
785 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
786 
      }
787 
      uidirty.from = 0;
788 
      uidirty.to = 0xff;
1282 mateusz.vi 789 
 
790 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 791 
       cursor_home(db);
1282 mateusz.vi 792 
 
793 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 794 
       cursor_eol(db);
1282 mateusz.vi 795 
 
1275 mateusz.vi 796 
    } else if (k == 0x1B) { /* ESC */
1331 mateusz.vi 797 
      if (db->modflag == 0) break;
798 
      /* if file has been modified then ask for confirmation */
1333 mateusz.vi 799 
      ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);
1331 mateusz.vi 800 
      if (keyb_getkey() == '\r') break;
1275 mateusz.vi 801 
 
1289 mateusz.vi 802 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 803 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 804 
      /* add a new line */
1328 mateusz.vi 805 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1330 mateusz.vi 806 
        db->modflag = 1;
1328 mateusz.vi 807 
        db->cursor = db->cursor->prev; /* back to original line */
808 
        db->curline -= 1;
1289 mateusz.vi 809 
        /* trim the line above */
1328 mateusz.vi 810 
        db->cursor->len = off;
1289 mateusz.vi 811 
        /* move cursor to the (new) line below */
1328 mateusz.vi 812 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 813 
        uidirty.to = 0xff;
1328 mateusz.vi 814 
        cursor_down(db);
815 
        cursor_home(db);
1289 mateusz.vi 816 
      } else {
817 
        /* ERROR: OUT OF MEMORY */
818 
      }
819 
 
1292 mateusz.vi 820 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 821 
      del(db);
1292 mateusz.vi 822 
 
1302 mateusz.vi 823 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 824 
      bkspc(db);
1302 mateusz.vi 825 
 
1308 mateusz.vi 826 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 827 
      char c = k;
1327 mateusz.vi 828 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 829 
 
1317 mateusz.vi 830 
    } else if (k == 0x009) { /* TAB */
831 
      const char *tab = "        ";
1327 mateusz.vi 832 
      insert_in_line(db, tab, 8);
1317 mateusz.vi 833 
 
1309 mateusz.vi 834 
    } else if (k == 0x13b) { /* F1 */
1326 mateusz.vi 835 
      ui_help();
1327 mateusz.vi 836 
      uidirty.from = 0;
837 
      uidirty.to = 0xff;
1309 mateusz.vi 838 
 
1332 mateusz.vi 839 
    } else if ((k == 0x13f) || (k == 0x140)) { /* F5 or F6 */
840 
      int saveres;
841 
 
842 
      if ((k == 0x140) || (db->fname[0] == 0)) { /* save as... */
843 
        char fname[25];
844 
        ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
845 
        if (*fname == 0) continue;
846 
        saveres = savefile(db, fname);
847 
        if (saveres == 0) memcpy(db->fname, fname, sizeof(fname));
848 
      } else {
849 
        saveres = savefile(db, NULL);
850 
      }
851 
 
852 
      if (saveres == 0) {
1330 mateusz.vi 853 
        db->modflag = 0;
1333 mateusz.vi 854 
        ui_msg(svarlang_str(0, 2), NULL, SCHEME_MSG);
1322 mateusz.vi 855 
        mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
856 
      } else {
1333 mateusz.vi 857 
        ui_msg(svarlang_str(0, 3), NULL, SCHEME_ERR);
1322 mateusz.vi 858 
        mdr_bios_tickswait(36); /* 2s */
859 
      }
1311 mateusz.vi 860 
 
1332 mateusz.vi 861 
      ui_basic(db);
862 
      ui_refresh(db);
863 
 
1314 mateusz.vi 864 
    } else if (k == 0x144) { /* F10 */
1330 mateusz.vi 865 
      db->modflag = 1;
1320 mateusz.vi 866 
      db->lfonly ^= 1;
1326 mateusz.vi 867 
      ui_basic(db);
1314 mateusz.vi 868 
 
1325 mateusz.vi 869 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
870 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
871 
      for (;;) {
872 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
873 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 874 
        cursor_right(db);
1325 mateusz.vi 875 
      }
876 
      /* now skip to next non-space or end of file */
877 
      for (;;) {
1327 mateusz.vi 878 
        cursor_right(db);
1325 mateusz.vi 879 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
880 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
881 
      }
882 
 
883 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 884 
      cursor_left(db);
1325 mateusz.vi 885 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
886 
      for (;;) {
887 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
888 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 889 
        cursor_left(db);
1325 mateusz.vi 890 
      }
891 
      /* now skip to next space or start of file */
892 
      for (;;) {
1327 mateusz.vi 893 
        cursor_left(db);
1325 mateusz.vi 894 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 895 
          cursor_right(db);
1325 mateusz.vi 896 
          break;
897 
        }
898 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
899 
      }
900 
 
1333 mateusz.vi 901 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 902 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
903 
      char buff[4];
904 
      const char *HEX = "0123456789ABCDEF";
905 
      buff[0] = HEX[(k >> 8) & 15];
906 
      buff[1] = HEX[(k >> 4) & 15];
907 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 908 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
909 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1275 mateusz.vi 910 
      keyb_getkey();
911 
      break;
1333 mateusz.vi 912 
#endif
1275 mateusz.vi 913 
    }
914 
  }
915 
 
916 
  mdr_cout_close();
917 
 
1320 mateusz.vi 918 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 919 
 
920 
  return(0);
921 
}