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