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1283 mateusz.vi 1 
/* Sved, the SvarDOS editor
2 
 *
3 
 * Copyright (C) 2023 Mateusz Viste
4 
 *
5 
 * Sved is released under the terms of the MIT license.
6 
 *
7 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 
 * of this software and associated documentation files (the "Software"), to
9 
 * deal in the Software without restriction, including without limitation the
10 
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
11 
 * sell copies of the Software, and to permit persons to whom the Software is
12 
 * furnished to do so, subject to the following conditions:
13 
 *
14 
 * The above copyright notice and this permission notice shall be included in
15 
 * all copies or substantial portions of the Software.
16 
 *
17 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22 
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
23 
 * IN THE SOFTWARE.
24 
 */
1275 mateusz.vi 25 
 
1282 mateusz.vi 26 
#include <dos.h>
27 
#include <fcntl.h>
1275 mateusz.vi 28 
#include <stdlib.h>
29 
#include <string.h>
1288 mateusz.vi 30 
#include <malloc.h>   /* _fcalloc() */
1275 mateusz.vi 31 
 
1312 mateusz.vi 32 
#include "mdr\bios.h"
1275 mateusz.vi 33 
#include "mdr\cout.h"
1307 mateusz.vi 34 
#include "mdr\dos.h"
1275 mateusz.vi 35 
#include "mdr\keyb.h"
36 
 
1282 mateusz.vi 37 
#include "svarlang\svarlang.h"
38 
 
1326 mateusz.vi 39 
 
40 
/*****************************************************************************
41 
 * global variables and definitions                                          *
42 
 *****************************************************************************/
43 
 
1275 mateusz.vi 44 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
1333 mateusz.vi 45 
static unsigned char SCHEME_TEXT   = 0x07,
46 
                     SCHEME_STBAR1 = 0x70,
47 
                     SCHEME_STBAR2 = 0x70,
48 
                     SCHEME_STBAR3 = 0xf0,
49 
                     SCHEME_SCROLL = 0x70,
50 
                     SCHEME_MSG    = 0x70,
51 
                     SCHEME_ERR    = 0xf0;
1327 mateusz.vi 52 
 
1326 mateusz.vi 53 
static unsigned char screenw, screenh;
1275 mateusz.vi 54 
 
1327 mateusz.vi 55 
static struct {
56 
    unsigned char from;
57 
    unsigned char to;
58 
} uidirty = {0, 0xff}; /* make sure to redraw entire UI at first run */
59 
 
1275 mateusz.vi 60 
#define SCROLL_CURSOR 0xB1
61 
 
62 
struct line {
1288 mateusz.vi 63 
  struct line far *prev;
64 
  struct line far *next;
1275 mateusz.vi 65 
  unsigned short len;
66 
  char payload[1];
67 
};
68 
 
1315 mateusz.vi 69 
struct file {
1320 mateusz.vi 70 
  int fd;
1288 mateusz.vi 71 
  struct line far *cursor;
1275 mateusz.vi 72 
  unsigned short xoffset;
1316 mateusz.vi 73 
  unsigned char cursorposx;
74 
  unsigned char cursorposy;
1328 mateusz.vi 75 
  unsigned short totlines;
76 
  unsigned short curline;
1330 mateusz.vi 77 
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
78 
  char modflag;  /* non-zero if file has been modified since last save */
1332 mateusz.vi 79 
  char fname[128];
1275 mateusz.vi 80 
};
81 
 
82 
 
1326 mateusz.vi 83 
/*****************************************************************************
84 
 * functions                                                                 *
85 
 *****************************************************************************/
86 
 
1328 mateusz.vi 87 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 88 
 * returns non-zero on error */
1328 mateusz.vi 89 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 90 
  struct line far *l;
1275 mateusz.vi 91 
 
1328 mateusz.vi 92 
  l = _fcalloc(1, sizeof(struct line) + slen);
1287 mateusz.vi 93 
  if (l == NULL) return(-1);
94 
 
1275 mateusz.vi 95 
  l->prev = db->cursor;
96 
  if (db->cursor) {
97 
    l->next = db->cursor->next;
98 
    db->cursor->next = l;
99 
    l->next->prev = l;
100 
  }
101 
  db->cursor = l;
1337 mateusz.vi 102 
  _fmemmove(l->payload, line, slen);
1275 mateusz.vi 103 
  l->len = slen;
1287 mateusz.vi 104 
 
1328 mateusz.vi 105 
  db->totlines += 1;
106 
  db->curline += 1;
107 
 
1287 mateusz.vi 108 
  return(0);
1275 mateusz.vi 109 
}
110 
 
111 
 
1332 mateusz.vi 112 
static void ui_getstring(const char *query, char *s, unsigned char maxlen) {
113 
  unsigned char len = 0, y, x;
114 
  int k;
115 
 
116 
  if (maxlen == 0) return;
117 
  maxlen--; /* make room for the nul terminator */
118 
 
119 
  y = screenh - 1;
120 
 
121 
  /* print query string */
1333 mateusz.vi 122 
  x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);
123 
  mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 124 
 
125 
  for (;;) {
126 
    mdr_cout_locate(y, x + len);
127 
    k = keyb_getkey();
128 
 
129 
    if (k == 0x1b) return; /* ESC */
130 
 
131 
    if (k == '\r') {
132 
      s[len] = 0;
133 
      return;
134 
    }
135 
 
136 
    if ((k == 0x08) && (len > 0)) { /* BKSPC */
137 
      len--;
1333 mateusz.vi 138 
      mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);
1332 mateusz.vi 139 
      continue;
140 
    }
141 
 
142 
    if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
1333 mateusz.vi 143 
      mdr_cout_char(y, x + len, k, SCHEME_STBAR3);
1332 mateusz.vi 144 
      s[len++] = k;
145 
    }
146 
 
147 
  }
148 
}
149 
 
150 
 
1324 mateusz.vi 151 
/* append a nul-terminated string to line at cursor position */
152 
static int line_append(struct file *f, const char far *buf, unsigned short len) {
153 
  struct line far *n;
154 
  if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */
155 
  n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);
156 
  if (n == NULL) return(-1);
157 
  f->cursor = n;
1337 mateusz.vi 158 
  _fmemmove(f->cursor->payload + f->cursor->len, buf, len);
1324 mateusz.vi 159 
  f->cursor->len += len;
160 
 
161 
  /* rewire the linked list */
162 
  if (f->cursor->next) f->cursor->next->prev = f->cursor;
163 
  if (f->cursor->prev) f->cursor->prev->next = f->cursor;
164 
 
165 
  return(0);
166 
}
167 
 
168 
 
1315 mateusz.vi 169 
static void db_rewind(struct file *db) {
1275 mateusz.vi 170 
  if (db->cursor == NULL) return;
171 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 172 
  db->curline = 0;
1275 mateusz.vi 173 
}
174 
 
175 
 
1326 mateusz.vi 176 
static void ui_basic(const struct file *db) {
1302 mateusz.vi 177 
  const char *s = svarlang_strid(0); /* HELP */
1335 mateusz.vi 178 
  unsigned char helpcol = screenw - strlen(s);
1275 mateusz.vi 179 
 
1330 mateusz.vi 180 
  /* fill status bar with background (without modflag as it is refreshed by ui_refresh) */
1333 mateusz.vi 181 
  mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);
1313 mateusz.vi 182 
 
183 
  /* filename */
1330 mateusz.vi 184 
  {
185 
    const char *fn = db->fname;
186 
    if (*fn == 0) fn = svarlang_str(0, 1);
1333 mateusz.vi 187 
    mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);
1321 mateusz.vi 188 
  }
1313 mateusz.vi 189 
 
190 
  /* eol type */
1330 mateusz.vi 191 
  {
192 
    const char *eoltype = "CRLF";
193 
    if (db->lfonly) eoltype = "LF";
1335 mateusz.vi 194 
    mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 195 
  }
1313 mateusz.vi 196 
 
1335 mateusz.vi 197 
  mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 198 
}
199 
 
200 
 
1331 mateusz.vi 201 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
1312 mateusz.vi 202 
  unsigned short x, y, msglen, i;
1331 mateusz.vi 203 
  unsigned char msg2flag = 0;
204 
 
205 
  msglen = strlen(msg1);
206 
  if (msg2) {
207 
    msg2flag = 1;
208 
    i = strlen(msg2);
209 
    if (i > msglen) msglen = i;
210 
  }
211 
 
212 
  y = (screenh - 6) >> 1;
1312 mateusz.vi 213 
  x = (screenw - msglen - 4) >> 1;
1331 mateusz.vi 214 
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
215 
  x++;
216 
  mdr_cout_str(y+1, x, msg1, attr, msglen);
217 
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
1312 mateusz.vi 218 
 
1327 mateusz.vi 219 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 220 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 221 
}
222 
 
223 
 
1326 mateusz.vi 224 
static void ui_help(void) {
1309 mateusz.vi 225 
#define MAXLINLEN 35
1336 mateusz.vi 226 
  unsigned char i, offset;
1325 mateusz.vi 227 
  offset = (screenw - MAXLINLEN + 2) >> 1;
1335 mateusz.vi 228 
 
229 
  for (i = 2; i < 18; i++) {
1333 mateusz.vi 230 
    mdr_cout_char_rep(i, offset - 2, ' ', SCHEME_STBAR1, MAXLINLEN + 2);
1309 mateusz.vi 231 
  }
232 
 
1335 mateusz.vi 233 
  for (i = 0; i < 20; i++) {
1337 mateusz.vi 234 
    const char *s = svarlang_str(8, i);
1335 mateusz.vi 235 
    if (s[0] == 0) break;
236 
    if (s[0] == '.') continue;
1336 mateusz.vi 237 
    mdr_cout_locate(3 + i, offset + mdr_cout_str(3 + i, offset, s, SCHEME_STBAR1, MAXLINLEN));
1309 mateusz.vi 238 
  }
239 
 
240 
  keyb_getkey();
241 
#undef MAXLINLEN
242 
}
243 
 
244 
 
1327 mateusz.vi 245 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 246 
  unsigned char x;
1310 mateusz.vi 247 
  const struct line far *l;
1316 mateusz.vi 248 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 249 
 
1288 mateusz.vi 250 
#ifdef DBG_REFRESH
1282 mateusz.vi 251 
  static char m = 'a';
252 
  m++;
253 
  if (m > 'z') m = 'a';
1288 mateusz.vi 254 
#endif
1282 mateusz.vi 255 
 
1310 mateusz.vi 256 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 257 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 258 
 
1310 mateusz.vi 259 
  /* iterate over lines and redraw whatever needs to be redrawn */
260 
  for (; l != NULL; l = l->next, y++) {
261 
 
262 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 263 
    if (y < uidirty.from) continue;
264 
    if (y > uidirty.to) break;
1282 mateusz.vi 265 
 
1318 mateusz.vi 266 
    x = 0;
1275 mateusz.vi 267 
    if (db->xoffset < l->len) {
1318 mateusz.vi 268 
      unsigned char i, limit;
269 
      if (l->len - db->xoffset < screenw) {
270 
        limit = l->len;
271 
      } else {
272 
        limit = db->xoffset + screenw - 1;
273 
      }
1333 mateusz.vi 274 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 275 
    }
1282 mateusz.vi 276 
 
1318 mateusz.vi 277 
    /* write empty spaces until end of line */
1333 mateusz.vi 278 
    if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);
1318 mateusz.vi 279 
 
1288 mateusz.vi 280 
#ifdef DBG_REFRESH
1333 mateusz.vi 281 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 282 
#endif
1282 mateusz.vi 283 
 
1275 mateusz.vi 284 
    if (y == screenh - 2) break;
285 
  }
1310 mateusz.vi 286 
 
1319 mateusz.vi 287 
  /* fill all lines below if empty (and they need to be redrawn) */
288 
  if (l == NULL) {
1327 mateusz.vi 289 
    while ((y < screenh - 1) && (y < uidirty.to)) {
1333 mateusz.vi 290 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);
1319 mateusz.vi 291 
    }
1318 mateusz.vi 292 
  }
1328 mateusz.vi 293 
 
1330 mateusz.vi 294 
  /* "file changed" flag */
295 
  {
296 
    char flg = ' ';
297 
    if (db->modflag) flg = '*';
1333 mateusz.vi 298 
    mdr_cout_char(screenh - 1, 0, flg, SCHEME_STBAR1);
1330 mateusz.vi 299 
  }
300 
 
1328 mateusz.vi 301 
  /* scroll bar */
302 
  for (y = 0; y < (screenh - 1); y++) {
1333 mateusz.vi 303 
    mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 304 
  }
305 
 
306 
  /* scroll cursor */
307 
  if (db->totlines >= screenh) {
308 
    unsigned short topline = db->curline - db->cursorposy;
309 
    unsigned short col;
310 
    unsigned short totlines = db->totlines - screenh + 1;
311 
    if (db->totlines - screenh > screenh) {
312 
      col = topline / (totlines / (screenh - 1));
313 
    } else {
314 
      col = topline * (screenh - 1) / totlines;
315 
    }
316 
    if (col >= screenh - 1) col = screenh - 2;
1333 mateusz.vi 317 
    mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);
1328 mateusz.vi 318 
  }
1275 mateusz.vi 319 
}
320 
 
321 
 
1327 mateusz.vi 322 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 323 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 324 
 
325 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 326 
    db->cursorposx = 0;
1275 mateusz.vi 327 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 328 
    uidirty.from = 0;
329 
    uidirty.to = 0xff;
1275 mateusz.vi 330 
  } else {
1316 mateusz.vi 331 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 332 
  }
333 
}
334 
 
335 
 
1327 mateusz.vi 336 
static void cursor_up(struct file *db) {
1275 mateusz.vi 337 
  if (db->cursor->prev != NULL) {
1328 mateusz.vi 338 
    db->curline -= 1;
1275 mateusz.vi 339 
    db->cursor = db->cursor->prev;
1316 mateusz.vi 340 
    if (db->cursorposy == 0) {
1327 mateusz.vi 341 
      uidirty.from = 0;
342 
      uidirty.to = 0xff;
1275 mateusz.vi 343 
    } else {
1316 mateusz.vi 344 
      db->cursorposy -= 1;
1275 mateusz.vi 345 
    }
346 
  }
347 
}
348 
 
349 
 
1327 mateusz.vi 350 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 351 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 352 
  if (db->xoffset > db->cursor->len) {
353 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 354 
    uidirty.from = 0;
355 
    uidirty.to = 0xff;
1282 mateusz.vi 356 
  }
357 
 
358 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
359 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 360 
    uidirty.from = 0;
361 
    uidirty.to = 0xff;
1282 mateusz.vi 362 
  }
1316 mateusz.vi 363 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 364 
}
365 
 
366 
 
1327 mateusz.vi 367 
static void cursor_down(struct file *db) {
1276 mateusz.vi 368 
  if (db->cursor->next != NULL) {
1328 mateusz.vi 369 
    db->curline += 1;
1276 mateusz.vi 370 
    db->cursor = db->cursor->next;
1316 mateusz.vi 371 
    if (db->cursorposy < screenh - 2) {
372 
      db->cursorposy += 1;
1276 mateusz.vi 373 
    } else {
1327 mateusz.vi 374 
      uidirty.from = 0;
375 
      uidirty.to = 0xff;
1276 mateusz.vi 376 
    }
377 
  }
378 
}
379 
 
380 
 
1327 mateusz.vi 381 
static void cursor_left(struct file *db) {
1316 mateusz.vi 382 
  if (db->cursorposx > 0) {
383 
    db->cursorposx -= 1;
1302 mateusz.vi 384 
  } else if (db->xoffset > 0) {
385 
    db->xoffset -= 1;
1327 mateusz.vi 386 
    uidirty.from = 0;
387 
    uidirty.to = 0xff;
1302 mateusz.vi 388 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 389 
    cursor_up(db);
390 
    cursor_eol(db);
1302 mateusz.vi 391 
  }
392 
}
393 
 
394 
 
1327 mateusz.vi 395 
static void cursor_home(struct file *db) {
1316 mateusz.vi 396 
  db->cursorposx = 0;
1282 mateusz.vi 397 
  if (db->xoffset != 0) {
398 
    db->xoffset = 0;
1327 mateusz.vi 399 
    uidirty.from = 0;
400 
    uidirty.to = 0xff;
1282 mateusz.vi 401 
  }
1276 mateusz.vi 402 
}
403 
 
404 
 
1327 mateusz.vi 405 
static void cursor_right(struct file *db) {
1316 mateusz.vi 406 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
407 
    if (db->cursorposx < screenw - 2) {
408 
      db->cursorposx += 1;
1308 mateusz.vi 409 
    } else {
410 
      db->xoffset += 1;
1327 mateusz.vi 411 
      uidirty.from = 0;
412 
      uidirty.to = 0xff;
1308 mateusz.vi 413 
    }
414 
  } else {
1327 mateusz.vi 415 
    cursor_down(db);
416 
    cursor_home(db);
1308 mateusz.vi 417 
  }
418 
}
419 
 
420 
 
1327 mateusz.vi 421 
static void del(struct file *db) {
1316 mateusz.vi 422 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
423 
    _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 424 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 425 
    uidirty.from = db->cursorposy;
426 
    uidirty.to = db->cursorposy;
1330 mateusz.vi 427 
    db->modflag = 1;
1292 mateusz.vi 428 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
429 
    struct line far *nextline = db->cursor->next;
430 
    if (db->cursor->next->len > 0) {
431 
      void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);
432 
      if (newptr != NULL) {
433 
        db->cursor = newptr;
1337 mateusz.vi 434 
        _fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 435 
        db->cursor->len += db->cursor->next->len;
436 
      }
437 
    }
438 
    db->cursor->next = db->cursor->next->next;
439 
    db->cursor->next->prev = db->cursor;
440 
    if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
441 
    _ffree(nextline);
1327 mateusz.vi 442 
    uidirty.from = db->cursorposy;
443 
    uidirty.to = 0xff;
1328 mateusz.vi 444 
    db->totlines -= 1;
1330 mateusz.vi 445 
    db->modflag = 1;
1292 mateusz.vi 446 
  }
447 
}
448 
 
449 
 
1327 mateusz.vi 450 
static void bkspc(struct file *db) {
1302 mateusz.vi 451 
 
452 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1316 mateusz.vi 453 
  if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 454 
 
1327 mateusz.vi 455 
  cursor_left(db);
456 
  del(db);
1302 mateusz.vi 457 
}
458 
 
459 
 
1286 mateusz.vi 460 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
461 
 * of argc and argv, saves some 330 bytes of binary size */
462 
static char *parseargv(void) {
463 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
464 
  unsigned char count = 0;
465 
  char *argv[4];
466 
 
467 
  while (count < 4) {
468 
    /* jump to nearest arg */
469 
    while (*tail == ' ') {
470 
      *tail = 0;
471 
      tail++;
472 
    }
473 
 
474 
    if (*tail == '\r') {
475 
      *tail = 0;
476 
      break;
477 
    }
478 
 
479 
    argv[count++] = tail;
480 
 
481 
    /* jump to next delimiter */
482 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
483 
  }
484 
 
485 
  /* check args now */
1321 mateusz.vi 486 
  if (count == 0) return("");
1286 mateusz.vi 487 
 
488 
  return(argv[0]);
489 
}
490 
 
491 
 
1320 mateusz.vi 492 
static struct file *loadfile(const char *fname) {
1324 mateusz.vi 493 
  char buff[512]; /* read one entire sector at a time (faster) */
494 
  char *buffptr;
495 
  unsigned int len, llen;
1287 mateusz.vi 496 
  int fd;
1324 mateusz.vi 497 
  unsigned char eolfound;
1320 mateusz.vi 498 
  struct file *db;
1287 mateusz.vi 499 
 
1321 mateusz.vi 500 
  len = strlen(fname) + 1;
1332 mateusz.vi 501 
  db = calloc(1, sizeof(struct file));
1321 mateusz.vi 502 
  if (db == NULL) return(NULL);
503 
  memcpy(db->fname, fname, len);
504 
 
505 
  if (*fname == 0) goto SKIPLOADING;
506 
 
1287 mateusz.vi 507 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
508 
    mdr_coutraw_puts("Failed to open file:");
509 
    mdr_coutraw_puts(fname);
1321 mateusz.vi 510 
    free(db);
1320 mateusz.vi 511 
    return(NULL);
1287 mateusz.vi 512 
  }
513 
 
1313 mateusz.vi 514 
  db->lfonly = 1;
515 
 
1324 mateusz.vi 516 
  /* start by adding an empty line */
1328 mateusz.vi 517 
  if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 518 
    /* TODO ERROR HANDLING */
519 
  }
1287 mateusz.vi 520 
 
1324 mateusz.vi 521 
  for (eolfound = 0;;) {
522 
    unsigned short consumedbytes;
523 
 
524 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
525 
    buffptr = buff;
526 
 
527 
    FINDLINE:
528 
 
529 
    /* look for nearest \n */
530 
    for (consumedbytes = 0;; consumedbytes++) {
531 
      if (consumedbytes == len) {
532 
        llen = consumedbytes;
533 
        break;
1323 mateusz.vi 534 
      }
1324 mateusz.vi 535 
      if (buffptr[consumedbytes] == '\r') {
536 
        llen = consumedbytes;
537 
        consumedbytes++;
538 
        db->lfonly = 0;
1320 mateusz.vi 539 
        break;
540 
      }
1324 mateusz.vi 541 
      if (buffptr[consumedbytes] == '\n') {
542 
        eolfound = 1;
543 
        llen = consumedbytes;
544 
        consumedbytes++;
545 
        break;
546 
      }
1287 mateusz.vi 547 
    }
1324 mateusz.vi 548 
 
549 
    /* consumedbytes is the amount of bytes processed from buffptr,
550 
     * llen is the length of line's payload (without its line terminator) */
551 
 
552 
    /* append content, if line is non-empty */
553 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1287 mateusz.vi 554 
      mdr_coutraw_puts("out of memory");
1320 mateusz.vi 555 
      free(db);
556 
      db = NULL;
1287 mateusz.vi 557 
      break;
558 
    }
559 
 
1324 mateusz.vi 560 
    /* add a new line if necessary */
561 
    if (eolfound) {
1328 mateusz.vi 562 
      if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 563 
      /* TODO ERROR HANDLING */
564 
        mdr_coutraw_puts("out of memory");
565 
        free(db);
566 
        db = NULL;
567 
        break;
568 
      }
569 
      eolfound = 0;
570 
    }
1287 mateusz.vi 571 
 
1324 mateusz.vi 572 
    /* anything left? process the buffer leftover again */
573 
    if (consumedbytes < len) {
574 
      len -= consumedbytes;
575 
      buffptr += consumedbytes;
576 
      goto FINDLINE;
577 
    }
578 
 
579 
  }
580 
 
1287 mateusz.vi 581 
  _dos_close(fd);
582 
 
1321 mateusz.vi 583 
  SKIPLOADING:
584 
 
1320 mateusz.vi 585 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
586 
  if (db != NULL) {
1328 mateusz.vi 587 
    if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
1320 mateusz.vi 588 
    db_rewind(db);
589 
  }
590 
 
591 
  return(db);
1287 mateusz.vi 592 
}
593 
 
594 
 
1332 mateusz.vi 595 
static int savefile(const struct file *db, const char *newfname) {
1311 mateusz.vi 596 
  int fd;
597 
  const struct line far *l;
598 
  unsigned bytes;
1313 mateusz.vi 599 
  unsigned char eollen;
600 
  unsigned char eolbuf[2];
1332 mateusz.vi 601 
  int errflag = 0;
1313 mateusz.vi 602 
 
1332 mateusz.vi 603 
  /* either create a new file if newfname provided, or... */
604 
  if (newfname) {
605 
    if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
606 
  } else { /* ...open db->fname */
607 
    if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
1311 mateusz.vi 608 
  }
609 
 
610 
  l = db->cursor;
611 
  while (l->prev) l = l->prev;
612 
 
1313 mateusz.vi 613 
  /* preset line terminators */
614 
  if (db->lfonly) {
615 
    eolbuf[0] = '\n';
616 
    eollen = 1;
617 
  } else {
618 
    eolbuf[0] = '\r';
619 
    eolbuf[1] = '\n';
620 
    eollen = 2;
621 
  }
622 
 
1311 mateusz.vi 623 
  while (l) {
1324 mateusz.vi 624 
    /* do not write the last empty line, it is only useful for edition */
625 
    if (l->len != 0) {
1332 mateusz.vi 626 
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
1324 mateusz.vi 627 
    } else if (l->next == NULL) {
628 
      break;
629 
    }
1332 mateusz.vi 630 
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
1311 mateusz.vi 631 
    l = l->next;
632 
  }
633 
 
1332 mateusz.vi 634 
  errflag |= _dos_close(fd);
1330 mateusz.vi 635 
 
1332 mateusz.vi 636 
  return(errflag);
1311 mateusz.vi 637 
}
638 
 
639 
 
1327 mateusz.vi 640 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1317 mateusz.vi 641 
  struct line far *n;
642 
  n = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + len);
643 
  if (n != NULL) {
644 
    unsigned short off = db->xoffset + db->cursorposx;
1330 mateusz.vi 645 
    db->modflag = 1;
1317 mateusz.vi 646 
    if (n->prev) n->prev->next = n;
647 
    if (n->next) n->next->prev = n;
648 
    db->cursor = n;
649 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
650 
    db->cursor->len += len;
1327 mateusz.vi 651 
    uidirty.from = db->cursorposy;
652 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 653 
    while (len--) {
654 
      db->cursor->payload[off++] = *databuf;
655 
      databuf++;
1327 mateusz.vi 656 
      cursor_right(db);
1317 mateusz.vi 657 
    }
658 
  }
659 
}
660 
 
661 
 
1286 mateusz.vi 662 
int main(void) {
663 
  const char *fname;
1320 mateusz.vi 664 
  struct file *db;
1275 mateusz.vi 665 
 
1307 mateusz.vi 666 
  {
667 
    char nlspath[128], lang[8];
668 
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
669 
  }
1282 mateusz.vi 670 
 
1286 mateusz.vi 671 
  fname = parseargv();
672 
 
673 
  if (fname == NULL) {
1302 mateusz.vi 674 
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
1275 mateusz.vi 675 
    return(0);
676 
  }
677 
 
1282 mateusz.vi 678 
  /* load file */
1320 mateusz.vi 679 
  db = loadfile(fname);
680 
  if (db == NULL) return(1);
1282 mateusz.vi 681 
 
1333 mateusz.vi 682 
  if (mdr_cout_init(&screenw, &screenh)) {
683 
    /* load color scheme if mdr_cout_init returns a color flag */
684 
    SCHEME_TEXT = 0x17;
685 
    SCHEME_STBAR1 = 0x70;
686 
    SCHEME_STBAR2 = 0x78;
687 
    SCHEME_STBAR3 = 0xf0;
688 
    SCHEME_SCROLL = 0x70;
689 
    SCHEME_MSG = 0xf0;
690 
    SCHEME_ERR = 0x4f;
691 
  }
1326 mateusz.vi 692 
  ui_basic(db);
1275 mateusz.vi 693 
 
694 
  for (;;) {
695 
    int k;
696 
 
1327 mateusz.vi 697 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 698 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 699 
 
1327 mateusz.vi 700 
    if (uidirty.from != 0xff) {
701 
      ui_refresh(db);
702 
      uidirty.from = 0xff;
1282 mateusz.vi 703 
    }
1328 mateusz.vi 704 
#ifdef DBG_LINENUM
705 
      {
706 
        char ddd[10];
707 
        db->curline += 1;
708 
        ddd[0] = '0' + db->curline / 100;
709 
        ddd[1] = '0' + (db->curline % 100) / 10;
710 
        ddd[2] = '0' + (db->curline % 10);
711 
        db->curline -= 1;
712 
        ddd[3] = '/';
713 
        ddd[4] = '0' + db->totlines / 100;
714 
        ddd[5] = '0' + (db->totlines % 100) / 10;
715 
        ddd[6] = '0' + (db->totlines % 10);
716 
        ddd[7] = 0;
1333 mateusz.vi 717 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 718 
      }
719 
#endif
1275 mateusz.vi 720 
 
721 
    k = keyb_getkey();
1282 mateusz.vi 722 
 
1275 mateusz.vi 723 
    if (k == 0x150) { /* down */
1327 mateusz.vi 724 
      cursor_down(db);
1275 mateusz.vi 725 
 
726 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 727 
      cursor_up(db);
1275 mateusz.vi 728 
 
729 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 730 
      cursor_right(db);
1275 mateusz.vi 731 
 
732 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 733 
      cursor_left(db);
1275 mateusz.vi 734 
 
1282 mateusz.vi 735 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 736 
      unsigned char dist = db->cursorposy + screenh - 1;
737 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
738 
        db->cursor = db->cursor->prev;
739 
        dist--;
740 
      }
741 
      if (dist != 0) {
742 
        db->cursorposy = 0;
743 
        db->cursorposx = 0;
744 
      } else {
745 
        dist = db->cursorposy;
746 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
747 
      }
748 
      uidirty.from = 0;
749 
      uidirty.to = 0xff;
1282 mateusz.vi 750 
 
751 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 752 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
753 
      while ((dist != 0) && (db->cursor->next != NULL)) {
754 
        db->cursor = db->cursor->next;
755 
        dist--;
756 
      }
757 
      if (dist != 0) {
758 
        db->cursorposy = screenh - 2;
759 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
760 
        db->cursorposx = 0;
761 
      } else {
762 
        dist = screenh - 2 - db->cursorposy;
763 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
764 
      }
765 
      uidirty.from = 0;
766 
      uidirty.to = 0xff;
1282 mateusz.vi 767 
 
768 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 769 
       cursor_home(db);
1282 mateusz.vi 770 
 
771 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 772 
       cursor_eol(db);
1282 mateusz.vi 773 
 
1275 mateusz.vi 774 
    } else if (k == 0x1B) { /* ESC */
1331 mateusz.vi 775 
      if (db->modflag == 0) break;
776 
      /* if file has been modified then ask for confirmation */
1333 mateusz.vi 777 
      ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);
1331 mateusz.vi 778 
      if (keyb_getkey() == '\r') break;
1275 mateusz.vi 779 
 
1289 mateusz.vi 780 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 781 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 782 
      /* add a new line */
1328 mateusz.vi 783 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1330 mateusz.vi 784 
        db->modflag = 1;
1328 mateusz.vi 785 
        db->cursor = db->cursor->prev; /* back to original line */
786 
        db->curline -= 1;
1289 mateusz.vi 787 
        /* trim the line above */
1328 mateusz.vi 788 
        db->cursor->len = off;
1289 mateusz.vi 789 
        /* move cursor to the (new) line below */
1328 mateusz.vi 790 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 791 
        uidirty.to = 0xff;
1328 mateusz.vi 792 
        cursor_down(db);
793 
        cursor_home(db);
1289 mateusz.vi 794 
      } else {
795 
        /* ERROR: OUT OF MEMORY */
796 
      }
797 
 
1292 mateusz.vi 798 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 799 
      del(db);
1292 mateusz.vi 800 
 
1302 mateusz.vi 801 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 802 
      bkspc(db);
1302 mateusz.vi 803 
 
1308 mateusz.vi 804 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 805 
      char c = k;
1327 mateusz.vi 806 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 807 
 
1317 mateusz.vi 808 
    } else if (k == 0x009) { /* TAB */
809 
      const char *tab = "        ";
1327 mateusz.vi 810 
      insert_in_line(db, tab, 8);
1317 mateusz.vi 811 
 
1309 mateusz.vi 812 
    } else if (k == 0x13b) { /* F1 */
1326 mateusz.vi 813 
      ui_help();
1327 mateusz.vi 814 
      uidirty.from = 0;
815 
      uidirty.to = 0xff;
1309 mateusz.vi 816 
 
1332 mateusz.vi 817 
    } else if ((k == 0x13f) || (k == 0x140)) { /* F5 or F6 */
818 
      int saveres;
819 
 
820 
      if ((k == 0x140) || (db->fname[0] == 0)) { /* save as... */
821 
        char fname[25];
822 
        ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
823 
        if (*fname == 0) continue;
824 
        saveres = savefile(db, fname);
825 
        if (saveres == 0) memcpy(db->fname, fname, sizeof(fname));
826 
      } else {
827 
        saveres = savefile(db, NULL);
828 
      }
829 
 
830 
      if (saveres == 0) {
1330 mateusz.vi 831 
        db->modflag = 0;
1333 mateusz.vi 832 
        ui_msg(svarlang_str(0, 2), NULL, SCHEME_MSG);
1322 mateusz.vi 833 
        mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
834 
      } else {
1333 mateusz.vi 835 
        ui_msg(svarlang_str(0, 3), NULL, SCHEME_ERR);
1322 mateusz.vi 836 
        mdr_bios_tickswait(36); /* 2s */
837 
      }
1311 mateusz.vi 838 
 
1332 mateusz.vi 839 
      ui_basic(db);
840 
      ui_refresh(db);
841 
 
1314 mateusz.vi 842 
    } else if (k == 0x144) { /* F10 */
1330 mateusz.vi 843 
      db->modflag = 1;
1320 mateusz.vi 844 
      db->lfonly ^= 1;
1326 mateusz.vi 845 
      ui_basic(db);
1314 mateusz.vi 846 
 
1325 mateusz.vi 847 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
848 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
849 
      for (;;) {
850 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
851 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 852 
        cursor_right(db);
1325 mateusz.vi 853 
      }
854 
      /* now skip to next non-space or end of file */
855 
      for (;;) {
1327 mateusz.vi 856 
        cursor_right(db);
1325 mateusz.vi 857 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
858 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
859 
      }
860 
 
861 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 862 
      cursor_left(db);
1325 mateusz.vi 863 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
864 
      for (;;) {
865 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
866 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 867 
        cursor_left(db);
1325 mateusz.vi 868 
      }
869 
      /* now skip to next space or start of file */
870 
      for (;;) {
1327 mateusz.vi 871 
        cursor_left(db);
1325 mateusz.vi 872 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 873 
          cursor_right(db);
1325 mateusz.vi 874 
          break;
875 
        }
876 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
877 
      }
878 
 
1333 mateusz.vi 879 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 880 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
881 
      char buff[4];
882 
      const char *HEX = "0123456789ABCDEF";
883 
      buff[0] = HEX[(k >> 8) & 15];
884 
      buff[1] = HEX[(k >> 4) & 15];
885 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 886 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
887 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1275 mateusz.vi 888 
      keyb_getkey();
889 
      break;
1333 mateusz.vi 890 
#endif
1275 mateusz.vi 891 
    }
892 
  }
893 
 
894 
  mdr_cout_close();
895 
 
1320 mateusz.vi 896 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 897 
 
898 
  return(0);
899 
}