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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 
 *****************************************************************************/
1275 mateusz.vi 43 
#define COL_TXT        0
44 
#define COL_STATUSBAR1 1
45 
#define COL_STATUSBAR2 2
1332 mateusz.vi 46 
#define COL_STATUSBAR3 3
47 
#define COL_SCROLLBAR  4
48 
#define COL_MSG        5
49 
#define COL_ERR        6
1326 mateusz.vi 50 
 
1275 mateusz.vi 51 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
1332 mateusz.vi 52 
static unsigned char scheme[] = {0x07, 0x70, 0x70, 0xf0, 0x70, 0x70, 0xf0};
1327 mateusz.vi 53 
 
1326 mateusz.vi 54 
static unsigned char screenw, screenh;
1275 mateusz.vi 55 
 
1327 mateusz.vi 56 
static struct {
57 
    unsigned char from;
58 
    unsigned char to;
59 
} uidirty = {0, 0xff}; /* make sure to redraw entire UI at first run */
60 
 
1275 mateusz.vi 61 
#define SCROLL_CURSOR 0xB1
62 
 
63 
struct line {
1288 mateusz.vi 64 
  struct line far *prev;
65 
  struct line far *next;
1275 mateusz.vi 66 
  unsigned short len;
67 
  char payload[1];
68 
};
69 
 
1315 mateusz.vi 70 
struct file {
1320 mateusz.vi 71 
  int fd;
1288 mateusz.vi 72 
  struct line far *cursor;
1275 mateusz.vi 73 
  unsigned short xoffset;
1316 mateusz.vi 74 
  unsigned char cursorposx;
75 
  unsigned char cursorposy;
1328 mateusz.vi 76 
  unsigned short totlines;
77 
  unsigned short curline;
1330 mateusz.vi 78 
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
79 
  char modflag;  /* non-zero if file has been modified since last save */
1332 mateusz.vi 80 
  char fname[128];
1275 mateusz.vi 81 
};
82 
 
83 
 
1326 mateusz.vi 84 
/*****************************************************************************
85 
 * functions                                                                 *
86 
 *****************************************************************************/
87 
 
1328 mateusz.vi 88 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 89 
 * returns non-zero on error */
1328 mateusz.vi 90 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 91 
  struct line far *l;
1275 mateusz.vi 92 
 
1328 mateusz.vi 93 
  l = _fcalloc(1, sizeof(struct line) + slen);
1287 mateusz.vi 94 
  if (l == NULL) return(-1);
95 
 
1275 mateusz.vi 96 
  l->prev = db->cursor;
97 
  if (db->cursor) {
98 
    l->next = db->cursor->next;
99 
    db->cursor->next = l;
100 
    l->next->prev = l;
101 
  }
102 
  db->cursor = l;
1288 mateusz.vi 103 
  _fmemcpy(l->payload, line, slen);
1275 mateusz.vi 104 
  l->len = slen;
1287 mateusz.vi 105 
 
1328 mateusz.vi 106 
  db->totlines += 1;
107 
  db->curline += 1;
108 
 
1287 mateusz.vi 109 
  return(0);
1275 mateusz.vi 110 
}
111 
 
112 
 
1332 mateusz.vi 113 
static void ui_getstring(const char *query, char *s, unsigned char maxlen) {
114 
  unsigned char len = 0, y, x;
115 
  int k;
116 
 
117 
  if (maxlen == 0) return;
118 
  maxlen--; /* make room for the nul terminator */
119 
 
120 
  y = screenh - 1;
121 
 
122 
  /* print query string */
123 
  x = mdr_cout_str(y, 0, query, scheme[COL_STATUSBAR3], 40);
124 
  mdr_cout_char_rep(y, x++, ' ', scheme[COL_STATUSBAR3], screenw - x);
125 
 
126 
  for (;;) {
127 
    mdr_cout_locate(y, x + len);
128 
    k = keyb_getkey();
129 
 
130 
    if (k == 0x1b) return; /* ESC */
131 
 
132 
    if (k == '\r') {
133 
      s[len] = 0;
134 
      return;
135 
    }
136 
 
137 
    if ((k == 0x08) && (len > 0)) { /* BKSPC */
138 
      len--;
139 
      mdr_cout_char(y, x + len, ' ', scheme[COL_STATUSBAR3]);
140 
      continue;
141 
    }
142 
 
143 
    if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
144 
      mdr_cout_char(y, x + len, k, scheme[COL_STATUSBAR3]);
145 
      s[len++] = k;
146 
    }
147 
 
148 
  }
149 
}
150 
 
151 
 
1324 mateusz.vi 152 
/* append a nul-terminated string to line at cursor position */
153 
static int line_append(struct file *f, const char far *buf, unsigned short len) {
154 
  struct line far *n;
155 
  if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */
156 
  n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);
157 
  if (n == NULL) return(-1);
158 
  f->cursor = n;
159 
  _fmemcpy(f->cursor->payload + f->cursor->len, buf, len);
160 
  f->cursor->len += len;
161 
 
162 
  /* rewire the linked list */
163 
  if (f->cursor->next) f->cursor->next->prev = f->cursor;
164 
  if (f->cursor->prev) f->cursor->prev->next = f->cursor;
165 
 
166 
  return(0);
167 
}
168 
 
169 
 
1315 mateusz.vi 170 
static void db_rewind(struct file *db) {
1275 mateusz.vi 171 
  if (db->cursor == NULL) return;
172 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 173 
  db->curline = 0;
1275 mateusz.vi 174 
}
175 
 
176 
 
1289 mateusz.vi 177 
static void load_colorscheme(void) {
1275 mateusz.vi 178 
  scheme[COL_TXT] = 0x17;
179 
  scheme[COL_STATUSBAR1] = 0x70;
180 
  scheme[COL_STATUSBAR2] = 0x78;
1332 mateusz.vi 181 
  scheme[COL_STATUSBAR3] = 0xf0;
1275 mateusz.vi 182 
  scheme[COL_SCROLLBAR] = 0x70;
1324 mateusz.vi 183 
  scheme[COL_MSG] = 0xf0;
1322 mateusz.vi 184 
  scheme[COL_ERR] = 0x4f;
1275 mateusz.vi 185 
}
186 
 
187 
 
1326 mateusz.vi 188 
static void ui_basic(const struct file *db) {
1302 mateusz.vi 189 
  const char *s = svarlang_strid(0); /* HELP */
1275 mateusz.vi 190 
  unsigned char helpcol = screenw - (strlen(s) + 4);
191 
 
1330 mateusz.vi 192 
  /* fill status bar with background (without modflag as it is refreshed by ui_refresh) */
193 
  mdr_cout_char_rep(screenh - 1, 1, ' ', scheme[COL_STATUSBAR1], screenw - 1);
1313 mateusz.vi 194 
 
195 
  /* filename */
1330 mateusz.vi 196 
  {
197 
    const char *fn = db->fname;
198 
    if (*fn == 0) fn = svarlang_str(0, 1);
199 
    mdr_cout_str(screenh - 1, 1, fn, scheme[COL_STATUSBAR1], screenw);
1321 mateusz.vi 200 
  }
1313 mateusz.vi 201 
 
202 
  /* eol type */
1330 mateusz.vi 203 
  {
204 
    const char *eoltype = "CRLF";
205 
    if (db->lfonly) eoltype = "LF";
206 
    mdr_cout_str(screenh - 1, helpcol - 5, eoltype, scheme[COL_STATUSBAR1], 5);
1275 mateusz.vi 207 
  }
1313 mateusz.vi 208 
 
1275 mateusz.vi 209 
  mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);
210 
  mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);
211 
}
212 
 
213 
 
1331 mateusz.vi 214 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
1312 mateusz.vi 215 
  unsigned short x, y, msglen, i;
1331 mateusz.vi 216 
  unsigned char msg2flag = 0;
217 
 
218 
  msglen = strlen(msg1);
219 
  if (msg2) {
220 
    msg2flag = 1;
221 
    i = strlen(msg2);
222 
    if (i > msglen) msglen = i;
223 
  }
224 
 
225 
  y = (screenh - 6) >> 1;
1312 mateusz.vi 226 
  x = (screenw - msglen - 4) >> 1;
1331 mateusz.vi 227 
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
228 
  x++;
229 
  mdr_cout_str(y+1, x, msg1, attr, msglen);
230 
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
1312 mateusz.vi 231 
 
1327 mateusz.vi 232 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 233 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 234 
}
235 
 
236 
 
1326 mateusz.vi 237 
static void ui_help(void) {
1309 mateusz.vi 238 
#define MAXLINLEN 35
1312 mateusz.vi 239 
  unsigned short i, offset;
1325 mateusz.vi 240 
  offset = (screenw - MAXLINLEN + 2) >> 1;
1309 mateusz.vi 241 
  mdr_cout_cursor_hide();
1325 mateusz.vi 242 
  for (i = 2; i <= 15; i++) {
243 
    mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);
1309 mateusz.vi 244 
  }
245 
 
246 
  mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);
1325 mateusz.vi 247 
  for (i = 0; i <= 4; i++) {
1309 mateusz.vi 248 
    mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);
249 
  }
1325 mateusz.vi 250 
  mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);
1309 mateusz.vi 251 
 
1325 mateusz.vi 252 
  /* Press any key */
253 
  mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);
254 
 
1309 mateusz.vi 255 
  keyb_getkey();
256 
  mdr_cout_cursor_show();
257 
#undef MAXLINLEN
258 
}
259 
 
260 
 
1327 mateusz.vi 261 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 262 
  unsigned char x;
1310 mateusz.vi 263 
  const struct line far *l;
1316 mateusz.vi 264 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 265 
 
1288 mateusz.vi 266 
#ifdef DBG_REFRESH
1282 mateusz.vi 267 
  static char m = 'a';
268 
  m++;
269 
  if (m > 'z') m = 'a';
1288 mateusz.vi 270 
#endif
1282 mateusz.vi 271 
 
1310 mateusz.vi 272 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 273 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 274 
 
1310 mateusz.vi 275 
  /* iterate over lines and redraw whatever needs to be redrawn */
276 
  for (; l != NULL; l = l->next, y++) {
277 
 
278 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 279 
    if (y < uidirty.from) continue;
280 
    if (y > uidirty.to) break;
1282 mateusz.vi 281 
 
1318 mateusz.vi 282 
    x = 0;
1275 mateusz.vi 283 
    if (db->xoffset < l->len) {
1318 mateusz.vi 284 
      unsigned char i, limit;
285 
      if (l->len - db->xoffset < screenw) {
286 
        limit = l->len;
287 
      } else {
288 
        limit = db->xoffset + screenw - 1;
289 
      }
290 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);
1275 mateusz.vi 291 
    }
1282 mateusz.vi 292 
 
1318 mateusz.vi 293 
    /* write empty spaces until end of line */
294 
    if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);
295 
 
1288 mateusz.vi 296 
#ifdef DBG_REFRESH
1282 mateusz.vi 297 
    mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);
1288 mateusz.vi 298 
#endif
1282 mateusz.vi 299 
 
1275 mateusz.vi 300 
    if (y == screenh - 2) break;
301 
  }
1310 mateusz.vi 302 
 
1319 mateusz.vi 303 
  /* fill all lines below if empty (and they need to be redrawn) */
304 
  if (l == NULL) {
1327 mateusz.vi 305 
    while ((y < screenh - 1) && (y < uidirty.to)) {
1319 mateusz.vi 306 
      mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);
307 
    }
1318 mateusz.vi 308 
  }
1328 mateusz.vi 309 
 
1330 mateusz.vi 310 
  /* "file changed" flag */
311 
  {
312 
    char flg = ' ';
313 
    if (db->modflag) flg = '*';
314 
    mdr_cout_char(screenh - 1, 0, flg, scheme[COL_STATUSBAR1]);
315 
  }
316 
 
1328 mateusz.vi 317 
  /* scroll bar */
318 
  for (y = 0; y < (screenh - 1); y++) {
319 
    mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);
320 
  }
321 
 
322 
  /* scroll cursor */
323 
  if (db->totlines >= screenh) {
324 
    unsigned short topline = db->curline - db->cursorposy;
325 
    unsigned short col;
326 
    unsigned short totlines = db->totlines - screenh + 1;
327 
    if (db->totlines - screenh > screenh) {
328 
      col = topline / (totlines / (screenh - 1));
329 
    } else {
330 
      col = topline * (screenh - 1) / totlines;
331 
    }
332 
    if (col >= screenh - 1) col = screenh - 2;
333 
    mdr_cout_char(col, screenw - 1, ' ', scheme[COL_SCROLLBAR]);
334 
  }
1275 mateusz.vi 335 
}
336 
 
337 
 
1327 mateusz.vi 338 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 339 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 340 
 
341 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 342 
    db->cursorposx = 0;
1275 mateusz.vi 343 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 344 
    uidirty.from = 0;
345 
    uidirty.to = 0xff;
1275 mateusz.vi 346 
  } else {
1316 mateusz.vi 347 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 348 
  }
349 
}
350 
 
351 
 
1327 mateusz.vi 352 
static void cursor_up(struct file *db) {
1275 mateusz.vi 353 
  if (db->cursor->prev != NULL) {
1328 mateusz.vi 354 
    db->curline -= 1;
1275 mateusz.vi 355 
    db->cursor = db->cursor->prev;
1316 mateusz.vi 356 
    if (db->cursorposy == 0) {
1327 mateusz.vi 357 
      uidirty.from = 0;
358 
      uidirty.to = 0xff;
1275 mateusz.vi 359 
    } else {
1316 mateusz.vi 360 
      db->cursorposy -= 1;
1275 mateusz.vi 361 
    }
362 
  }
363 
}
364 
 
365 
 
1327 mateusz.vi 366 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 367 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 368 
  if (db->xoffset > db->cursor->len) {
369 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 370 
    uidirty.from = 0;
371 
    uidirty.to = 0xff;
1282 mateusz.vi 372 
  }
373 
 
374 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
375 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 376 
    uidirty.from = 0;
377 
    uidirty.to = 0xff;
1282 mateusz.vi 378 
  }
1316 mateusz.vi 379 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 380 
}
381 
 
382 
 
1327 mateusz.vi 383 
static void cursor_down(struct file *db) {
1276 mateusz.vi 384 
  if (db->cursor->next != NULL) {
1328 mateusz.vi 385 
    db->curline += 1;
1276 mateusz.vi 386 
    db->cursor = db->cursor->next;
1316 mateusz.vi 387 
    if (db->cursorposy < screenh - 2) {
388 
      db->cursorposy += 1;
1276 mateusz.vi 389 
    } else {
1327 mateusz.vi 390 
      uidirty.from = 0;
391 
      uidirty.to = 0xff;
1276 mateusz.vi 392 
    }
393 
  }
394 
}
395 
 
396 
 
1327 mateusz.vi 397 
static void cursor_left(struct file *db) {
1316 mateusz.vi 398 
  if (db->cursorposx > 0) {
399 
    db->cursorposx -= 1;
1302 mateusz.vi 400 
  } else if (db->xoffset > 0) {
401 
    db->xoffset -= 1;
1327 mateusz.vi 402 
    uidirty.from = 0;
403 
    uidirty.to = 0xff;
1302 mateusz.vi 404 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 405 
    cursor_up(db);
406 
    cursor_eol(db);
1302 mateusz.vi 407 
  }
408 
}
409 
 
410 
 
1327 mateusz.vi 411 
static void cursor_home(struct file *db) {
1316 mateusz.vi 412 
  db->cursorposx = 0;
1282 mateusz.vi 413 
  if (db->xoffset != 0) {
414 
    db->xoffset = 0;
1327 mateusz.vi 415 
    uidirty.from = 0;
416 
    uidirty.to = 0xff;
1282 mateusz.vi 417 
  }
1276 mateusz.vi 418 
}
419 
 
420 
 
1327 mateusz.vi 421 
static void cursor_right(struct file *db) {
1316 mateusz.vi 422 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
423 
    if (db->cursorposx < screenw - 2) {
424 
      db->cursorposx += 1;
1308 mateusz.vi 425 
    } else {
426 
      db->xoffset += 1;
1327 mateusz.vi 427 
      uidirty.from = 0;
428 
      uidirty.to = 0xff;
1308 mateusz.vi 429 
    }
430 
  } else {
1327 mateusz.vi 431 
    cursor_down(db);
432 
    cursor_home(db);
1308 mateusz.vi 433 
  }
434 
}
435 
 
436 
 
1327 mateusz.vi 437 
static void del(struct file *db) {
1316 mateusz.vi 438 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
439 
    _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 440 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 441 
    uidirty.from = db->cursorposy;
442 
    uidirty.to = db->cursorposy;
1330 mateusz.vi 443 
    db->modflag = 1;
1292 mateusz.vi 444 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
445 
    struct line far *nextline = db->cursor->next;
446 
    if (db->cursor->next->len > 0) {
447 
      void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);
448 
      if (newptr != NULL) {
449 
        db->cursor = newptr;
450 
        _fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
451 
        db->cursor->len += db->cursor->next->len;
452 
      }
453 
    }
454 
    db->cursor->next = db->cursor->next->next;
455 
    db->cursor->next->prev = db->cursor;
456 
    if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
457 
    _ffree(nextline);
1327 mateusz.vi 458 
    uidirty.from = db->cursorposy;
459 
    uidirty.to = 0xff;
1328 mateusz.vi 460 
    db->totlines -= 1;
1330 mateusz.vi 461 
    db->modflag = 1;
1292 mateusz.vi 462 
  }
463 
}
464 
 
465 
 
1327 mateusz.vi 466 
static void bkspc(struct file *db) {
1302 mateusz.vi 467 
 
468 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1316 mateusz.vi 469 
  if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 470 
 
1327 mateusz.vi 471 
  cursor_left(db);
472 
  del(db);
1302 mateusz.vi 473 
}
474 
 
475 
 
1286 mateusz.vi 476 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
477 
 * of argc and argv, saves some 330 bytes of binary size */
478 
static char *parseargv(void) {
479 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
480 
  unsigned char count = 0;
481 
  char *argv[4];
482 
 
483 
  while (count < 4) {
484 
    /* jump to nearest arg */
485 
    while (*tail == ' ') {
486 
      *tail = 0;
487 
      tail++;
488 
    }
489 
 
490 
    if (*tail == '\r') {
491 
      *tail = 0;
492 
      break;
493 
    }
494 
 
495 
    argv[count++] = tail;
496 
 
497 
    /* jump to next delimiter */
498 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
499 
  }
500 
 
501 
  /* check args now */
1321 mateusz.vi 502 
  if (count == 0) return("");
1286 mateusz.vi 503 
 
504 
  return(argv[0]);
505 
}
506 
 
507 
 
1320 mateusz.vi 508 
static struct file *loadfile(const char *fname) {
1324 mateusz.vi 509 
  char buff[512]; /* read one entire sector at a time (faster) */
510 
  char *buffptr;
511 
  unsigned int len, llen;
1287 mateusz.vi 512 
  int fd;
1324 mateusz.vi 513 
  unsigned char eolfound;
1320 mateusz.vi 514 
  struct file *db;
1287 mateusz.vi 515 
 
1321 mateusz.vi 516 
  len = strlen(fname) + 1;
1332 mateusz.vi 517 
  db = calloc(1, sizeof(struct file));
1321 mateusz.vi 518 
  if (db == NULL) return(NULL);
519 
  memcpy(db->fname, fname, len);
520 
 
521 
  if (*fname == 0) goto SKIPLOADING;
522 
 
1287 mateusz.vi 523 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
524 
    mdr_coutraw_puts("Failed to open file:");
525 
    mdr_coutraw_puts(fname);
1321 mateusz.vi 526 
    free(db);
1320 mateusz.vi 527 
    return(NULL);
1287 mateusz.vi 528 
  }
529 
 
1313 mateusz.vi 530 
  db->lfonly = 1;
531 
 
1324 mateusz.vi 532 
  /* start by adding an empty line */
1328 mateusz.vi 533 
  if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 534 
    /* TODO ERROR HANDLING */
535 
  }
1287 mateusz.vi 536 
 
1324 mateusz.vi 537 
  for (eolfound = 0;;) {
538 
    unsigned short consumedbytes;
539 
 
540 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
541 
    buffptr = buff;
542 
 
543 
    FINDLINE:
544 
 
545 
    /* look for nearest \n */
546 
    for (consumedbytes = 0;; consumedbytes++) {
547 
      if (consumedbytes == len) {
548 
        llen = consumedbytes;
549 
        break;
1323 mateusz.vi 550 
      }
1324 mateusz.vi 551 
      if (buffptr[consumedbytes] == '\r') {
552 
        llen = consumedbytes;
553 
        consumedbytes++;
554 
        db->lfonly = 0;
1320 mateusz.vi 555 
        break;
556 
      }
1324 mateusz.vi 557 
      if (buffptr[consumedbytes] == '\n') {
558 
        eolfound = 1;
559 
        llen = consumedbytes;
560 
        consumedbytes++;
561 
        break;
562 
      }
1287 mateusz.vi 563 
    }
1324 mateusz.vi 564 
 
565 
    /* consumedbytes is the amount of bytes processed from buffptr,
566 
     * llen is the length of line's payload (without its line terminator) */
567 
 
568 
    /* append content, if line is non-empty */
569 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1287 mateusz.vi 570 
      mdr_coutraw_puts("out of memory");
1320 mateusz.vi 571 
      free(db);
572 
      db = NULL;
1287 mateusz.vi 573 
      break;
574 
    }
575 
 
1324 mateusz.vi 576 
    /* add a new line if necessary */
577 
    if (eolfound) {
1328 mateusz.vi 578 
      if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 579 
      /* TODO ERROR HANDLING */
580 
        mdr_coutraw_puts("out of memory");
581 
        free(db);
582 
        db = NULL;
583 
        break;
584 
      }
585 
      eolfound = 0;
586 
    }
1287 mateusz.vi 587 
 
1324 mateusz.vi 588 
    /* anything left? process the buffer leftover again */
589 
    if (consumedbytes < len) {
590 
      len -= consumedbytes;
591 
      buffptr += consumedbytes;
592 
      goto FINDLINE;
593 
    }
594 
 
595 
  }
596 
 
1287 mateusz.vi 597 
  _dos_close(fd);
598 
 
1321 mateusz.vi 599 
  SKIPLOADING:
600 
 
1320 mateusz.vi 601 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
602 
  if (db != NULL) {
1328 mateusz.vi 603 
    if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
1320 mateusz.vi 604 
    db_rewind(db);
605 
  }
606 
 
607 
  return(db);
1287 mateusz.vi 608 
}
609 
 
610 
 
1332 mateusz.vi 611 
static int savefile(const struct file *db, const char *newfname) {
1311 mateusz.vi 612 
  int fd;
613 
  const struct line far *l;
614 
  unsigned bytes;
1313 mateusz.vi 615 
  unsigned char eollen;
616 
  unsigned char eolbuf[2];
1332 mateusz.vi 617 
  int errflag = 0;
1313 mateusz.vi 618 
 
1332 mateusz.vi 619 
  /* either create a new file if newfname provided, or... */
620 
  if (newfname) {
621 
    if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
622 
  } else { /* ...open db->fname */
623 
    if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
1311 mateusz.vi 624 
  }
625 
 
626 
  l = db->cursor;
627 
  while (l->prev) l = l->prev;
628 
 
1313 mateusz.vi 629 
  /* preset line terminators */
630 
  if (db->lfonly) {
631 
    eolbuf[0] = '\n';
632 
    eollen = 1;
633 
  } else {
634 
    eolbuf[0] = '\r';
635 
    eolbuf[1] = '\n';
636 
    eollen = 2;
637 
  }
638 
 
1311 mateusz.vi 639 
  while (l) {
1324 mateusz.vi 640 
    /* do not write the last empty line, it is only useful for edition */
641 
    if (l->len != 0) {
1332 mateusz.vi 642 
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
1324 mateusz.vi 643 
    } else if (l->next == NULL) {
644 
      break;
645 
    }
1332 mateusz.vi 646 
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
1311 mateusz.vi 647 
    l = l->next;
648 
  }
649 
 
1332 mateusz.vi 650 
  errflag |= _dos_close(fd);
1330 mateusz.vi 651 
 
1332 mateusz.vi 652 
  return(errflag);
1311 mateusz.vi 653 
}
654 
 
655 
 
1327 mateusz.vi 656 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1317 mateusz.vi 657 
  struct line far *n;
658 
  n = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + len);
659 
  if (n != NULL) {
660 
    unsigned short off = db->xoffset + db->cursorposx;
1330 mateusz.vi 661 
    db->modflag = 1;
1317 mateusz.vi 662 
    if (n->prev) n->prev->next = n;
663 
    if (n->next) n->next->prev = n;
664 
    db->cursor = n;
665 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
666 
    db->cursor->len += len;
1327 mateusz.vi 667 
    uidirty.from = db->cursorposy;
668 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 669 
    while (len--) {
670 
      db->cursor->payload[off++] = *databuf;
671 
      databuf++;
1327 mateusz.vi 672 
      cursor_right(db);
1317 mateusz.vi 673 
    }
674 
  }
675 
}
676 
 
677 
 
1286 mateusz.vi 678 
int main(void) {
679 
  const char *fname;
1320 mateusz.vi 680 
  struct file *db;
1275 mateusz.vi 681 
 
1307 mateusz.vi 682 
  {
683 
    char nlspath[128], lang[8];
684 
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
685 
  }
1282 mateusz.vi 686 
 
1286 mateusz.vi 687 
  fname = parseargv();
688 
 
689 
  if (fname == NULL) {
1302 mateusz.vi 690 
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
1275 mateusz.vi 691 
    return(0);
692 
  }
693 
 
1282 mateusz.vi 694 
  /* load file */
1320 mateusz.vi 695 
  db = loadfile(fname);
696 
  if (db == NULL) return(1);
1282 mateusz.vi 697 
 
1275 mateusz.vi 698 
  if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();
1326 mateusz.vi 699 
  ui_basic(db);
1275 mateusz.vi 700 
 
701 
  for (;;) {
702 
    int k;
703 
 
1327 mateusz.vi 704 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 705 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 706 
 
1327 mateusz.vi 707 
    if (uidirty.from != 0xff) {
708 
      ui_refresh(db);
709 
      uidirty.from = 0xff;
1282 mateusz.vi 710 
    }
1328 mateusz.vi 711 
#ifdef DBG_LINENUM
712 
      {
713 
        char ddd[10];
714 
        db->curline += 1;
715 
        ddd[0] = '0' + db->curline / 100;
716 
        ddd[1] = '0' + (db->curline % 100) / 10;
717 
        ddd[2] = '0' + (db->curline % 10);
718 
        db->curline -= 1;
719 
        ddd[3] = '/';
720 
        ddd[4] = '0' + db->totlines / 100;
721 
        ddd[5] = '0' + (db->totlines % 100) / 10;
722 
        ddd[6] = '0' + (db->totlines % 10);
723 
        ddd[7] = 0;
724 
        mdr_cout_str(screenh - 1, 40, ddd, scheme[COL_STATUSBAR1], sizeof(ddd));
725 
      }
726 
#endif
1275 mateusz.vi 727 
 
728 
    k = keyb_getkey();
1282 mateusz.vi 729 
 
1275 mateusz.vi 730 
    if (k == 0x150) { /* down */
1327 mateusz.vi 731 
      cursor_down(db);
1275 mateusz.vi 732 
 
733 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 734 
      cursor_up(db);
1275 mateusz.vi 735 
 
736 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 737 
      cursor_right(db);
1275 mateusz.vi 738 
 
739 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 740 
      cursor_left(db);
1275 mateusz.vi 741 
 
1282 mateusz.vi 742 
    } else if (k == 0x149) { /* pgup */
743 
      // TODO
744 
 
745 
    } else if (k == 0x151) { /* pgdown */
746 
      // TODO
747 
 
748 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 749 
       cursor_home(db);
1282 mateusz.vi 750 
 
751 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 752 
       cursor_eol(db);
1282 mateusz.vi 753 
 
1275 mateusz.vi 754 
    } else if (k == 0x1B) { /* ESC */
1331 mateusz.vi 755 
      if (db->modflag == 0) break;
756 
      /* if file has been modified then ask for confirmation */
757 
      ui_msg(svarlang_str(0,4), svarlang_str(0,5), scheme[COL_MSG]);
758 
      if (keyb_getkey() == '\r') break;
1275 mateusz.vi 759 
 
1289 mateusz.vi 760 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 761 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 762 
      /* add a new line */
1328 mateusz.vi 763 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1330 mateusz.vi 764 
        db->modflag = 1;
1328 mateusz.vi 765 
        db->cursor = db->cursor->prev; /* back to original line */
766 
        db->curline -= 1;
1289 mateusz.vi 767 
        /* trim the line above */
1328 mateusz.vi 768 
        db->cursor->len = off;
1289 mateusz.vi 769 
        /* move cursor to the (new) line below */
1328 mateusz.vi 770 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 771 
        uidirty.to = 0xff;
1328 mateusz.vi 772 
        cursor_down(db);
773 
        cursor_home(db);
1289 mateusz.vi 774 
      } else {
775 
        /* ERROR: OUT OF MEMORY */
776 
      }
777 
 
1292 mateusz.vi 778 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 779 
      del(db);
1292 mateusz.vi 780 
 
1302 mateusz.vi 781 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 782 
      bkspc(db);
1302 mateusz.vi 783 
 
1308 mateusz.vi 784 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 785 
      char c = k;
1327 mateusz.vi 786 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 787 
 
1317 mateusz.vi 788 
    } else if (k == 0x009) { /* TAB */
789 
      const char *tab = "        ";
1327 mateusz.vi 790 
      insert_in_line(db, tab, 8);
1317 mateusz.vi 791 
 
1309 mateusz.vi 792 
    } else if (k == 0x13b) { /* F1 */
1326 mateusz.vi 793 
      ui_help();
1327 mateusz.vi 794 
      uidirty.from = 0;
795 
      uidirty.to = 0xff;
1309 mateusz.vi 796 
 
1332 mateusz.vi 797 
    } else if ((k == 0x13f) || (k == 0x140)) { /* F5 or F6 */
798 
      int saveres;
799 
 
800 
      if ((k == 0x140) || (db->fname[0] == 0)) { /* save as... */
801 
        char fname[25];
802 
        ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
803 
        if (*fname == 0) continue;
804 
        saveres = savefile(db, fname);
805 
        if (saveres == 0) memcpy(db->fname, fname, sizeof(fname));
806 
      } else {
807 
        saveres = savefile(db, NULL);
808 
      }
809 
 
810 
      if (saveres == 0) {
1330 mateusz.vi 811 
        db->modflag = 0;
1331 mateusz.vi 812 
        ui_msg(svarlang_str(0, 2), NULL, scheme[COL_MSG]);
1322 mateusz.vi 813 
        mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
814 
      } else {
1331 mateusz.vi 815 
        ui_msg(svarlang_str(0, 3), NULL, scheme[COL_ERR]);
1322 mateusz.vi 816 
        mdr_bios_tickswait(36); /* 2s */
817 
      }
1311 mateusz.vi 818 
 
1332 mateusz.vi 819 
      ui_basic(db);
820 
      ui_refresh(db);
821 
 
1314 mateusz.vi 822 
    } else if (k == 0x144) { /* F10 */
1330 mateusz.vi 823 
      db->modflag = 1;
1320 mateusz.vi 824 
      db->lfonly ^= 1;
1326 mateusz.vi 825 
      ui_basic(db);
1314 mateusz.vi 826 
 
1325 mateusz.vi 827 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
828 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
829 
      for (;;) {
830 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
831 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 832 
        cursor_right(db);
1325 mateusz.vi 833 
      }
834 
      /* now skip to next non-space or end of file */
835 
      for (;;) {
1327 mateusz.vi 836 
        cursor_right(db);
1325 mateusz.vi 837 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
838 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
839 
      }
840 
 
841 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 842 
      cursor_left(db);
1325 mateusz.vi 843 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
844 
      for (;;) {
845 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
846 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 847 
        cursor_left(db);
1325 mateusz.vi 848 
      }
849 
      /* now skip to next space or start of file */
850 
      for (;;) {
1327 mateusz.vi 851 
        cursor_left(db);
1325 mateusz.vi 852 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 853 
          cursor_right(db);
1325 mateusz.vi 854 
          break;
855 
        }
856 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
857 
      }
858 
 
1282 mateusz.vi 859 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
860 
      char buff[4];
861 
      const char *HEX = "0123456789ABCDEF";
862 
      buff[0] = HEX[(k >> 8) & 15];
863 
      buff[1] = HEX[(k >> 4) & 15];
864 
      buff[2] = HEX[k & 15];
865 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", scheme[COL_STATUSBAR1], 17);
866 
      mdr_cout_str(screenh - 1, 17, buff, scheme[COL_STATUSBAR1], 3);
1275 mateusz.vi 867 
      keyb_getkey();
868 
      break;
869 
    }
870 
  }
871 
 
872 
  mdr_cout_close();
873 
 
1320 mateusz.vi 874 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 875 
 
876 
  return(0);
877 
}