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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 
 
1275 mateusz.vi 39 
#define COL_TXT        0
40 
#define COL_STATUSBAR1 1
41 
#define COL_STATUSBAR2 2
42 
#define COL_SCROLLBAR  3
43 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
44 
static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};
45 
 
46 
#define SCROLL_CURSOR 0xB1
47 
 
48 
 
49 
struct line {
1288 mateusz.vi 50 
  struct line far *prev;
51 
  struct line far *next;
1275 mateusz.vi 52 
  unsigned short len;
53 
  char payload[1];
54 
};
55 
 
1315 mateusz.vi 56 
struct file {
1320 mateusz.vi 57 
  int fd;
1288 mateusz.vi 58 
  struct line far *cursor;
1275 mateusz.vi 59 
  unsigned short xoffset;
1316 mateusz.vi 60 
  unsigned char cursorposx;
61 
  unsigned char cursorposy;
1313 mateusz.vi 62 
  char lfonly; /* set if line endings are LF (CR/LF otherwise) */
1320 mateusz.vi 63 
  char fname[1]; /* dynamically sized */
1275 mateusz.vi 64 
};
65 
 
66 
 
1287 mateusz.vi 67 
/* returns non-zero on error */
1315 mateusz.vi 68 
static int line_add(struct file *db, const char far *line) {
1289 mateusz.vi 69 
  unsigned short slen;
1288 mateusz.vi 70 
  struct line far *l;
1275 mateusz.vi 71 
 
1289 mateusz.vi 72 
  /* slen = strlen(line) (but for far pointer) */
73 
  for (slen = 0; line[slen] != 0; slen++);
74 
 
1275 mateusz.vi 75 
  /* trim out CR/LF line endings */
76 
  if ((slen >= 2) && (line[slen - 2] == '\r')) {
77 
    slen -= 2;
78 
  } else if ((slen >= 1) && (line[slen - 1] == '\n')) {
79 
    slen--;
80 
  }
81 
 
1288 mateusz.vi 82 
  l = _fcalloc(1, sizeof(struct line) + slen + 1);
1287 mateusz.vi 83 
  if (l == NULL) return(-1);
84 
 
1275 mateusz.vi 85 
  l->prev = db->cursor;
86 
  if (db->cursor) {
87 
    l->next = db->cursor->next;
88 
    db->cursor->next = l;
89 
    l->next->prev = l;
90 
  }
91 
  db->cursor = l;
1288 mateusz.vi 92 
  _fmemcpy(l->payload, line, slen);
1275 mateusz.vi 93 
  l->len = slen;
1287 mateusz.vi 94 
 
95 
  return(0);
1275 mateusz.vi 96 
}
97 
 
98 
 
1315 mateusz.vi 99 
static void db_rewind(struct file *db) {
1275 mateusz.vi 100 
  if (db->cursor == NULL) return;
101 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
102 
}
103 
 
104 
 
1289 mateusz.vi 105 
static void load_colorscheme(void) {
1275 mateusz.vi 106 
  scheme[COL_TXT] = 0x17;
107 
  scheme[COL_STATUSBAR1] = 0x70;
108 
  scheme[COL_STATUSBAR2] = 0x78;
109 
  scheme[COL_SCROLLBAR] = 0x70;
110 
}
111 
 
112 
 
1320 mateusz.vi 113 
static void ui_basic(unsigned char screenw, unsigned char screenh, const struct file *db) {
1275 mateusz.vi 114 
  unsigned char i;
1302 mateusz.vi 115 
  const char *s = svarlang_strid(0); /* HELP */
1275 mateusz.vi 116 
  unsigned char helpcol = screenw - (strlen(s) + 4);
117 
 
1313 mateusz.vi 118 
  /* fill status bar with background */
119 
  mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);
120 
 
121 
  /* filename */
1321 mateusz.vi 122 
  if (db->fname[0] == 0) {
123 
    mdr_cout_str(screenh - 1, 0, svarlang_str(0, 1), scheme[COL_STATUSBAR1], screenw);
124 
  } else {
125 
    mdr_cout_str(screenh - 1, 0, db->fname, scheme[COL_STATUSBAR1], screenw);
126 
  }
1313 mateusz.vi 127 
 
128 
  /* eol type */
129 
  if (db->lfonly) {
130 
    mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);
131 
  } else {
132 
    mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);
1275 mateusz.vi 133 
  }
1313 mateusz.vi 134 
 
1275 mateusz.vi 135 
  mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);
136 
  mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);
137 
 
138 
  /* scroll bar */
139 
  for (i = 0; i < (screenh - 1); i++) {
140 
    mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);
141 
  }
142 
}
143 
 
144 
 
1312 mateusz.vi 145 
static void ui_msg(const char *msg, unsigned char screenw, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
146 
  unsigned short x, y, msglen, i;
147 
  msglen = strlen(msg);
148 
  y = (screenh - 4) >> 1;
149 
  x = (screenw - msglen - 4) >> 1;
150 
  for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', scheme[COL_STATUSBAR1], msglen + 2);
151 
  mdr_cout_str(y+1, x+1, msg, scheme[COL_STATUSBAR1], msglen);
152 
 
153 
  if (*uidirtyfrom > y) *uidirtyfrom = y;
154 
  if (*uidirtyto < y+2) *uidirtyto = y+2;
155 
}
156 
 
157 
 
1309 mateusz.vi 158 
static void ui_help(unsigned char screenw) {
159 
#define MAXLINLEN 35
1312 mateusz.vi 160 
  unsigned short i, offset;
1309 mateusz.vi 161 
  offset = (screenw - MAXLINLEN + 1) >> 1;
162 
  mdr_cout_cursor_hide();
163 
  for (i = 2; i <= 12; i++) {
1312 mateusz.vi 164 
    mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);
1309 mateusz.vi 165 
  }
166 
 
167 
  mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);
168 
  for (i = 0; i <= 2; i++) {
169 
    mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);
170 
  }
171 
  mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);
172 
  mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);
173 
 
174 
  keyb_getkey();
175 
  mdr_cout_cursor_show();
176 
#undef MAXLINLEN
177 
}
178 
 
179 
 
1316 mateusz.vi 180 
static void ui_refresh(const struct file *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {
1318 mateusz.vi 181 
  unsigned char x;
1310 mateusz.vi 182 
  const struct line far *l;
1316 mateusz.vi 183 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 184 
 
1288 mateusz.vi 185 
#ifdef DBG_REFRESH
1282 mateusz.vi 186 
  static char m = 'a';
187 
  m++;
188 
  if (m > 'z') m = 'a';
1288 mateusz.vi 189 
#endif
1282 mateusz.vi 190 
 
1310 mateusz.vi 191 
  /* rewind cursor line to first line that needs redrawing */
192 
  for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;
1282 mateusz.vi 193 
 
1310 mateusz.vi 194 
  /* iterate over lines and redraw whatever needs to be redrawn */
195 
  for (; l != NULL; l = l->next, y++) {
196 
 
197 
    /* skip lines that do not need to be refreshed */
1289 mateusz.vi 198 
    if (y < uidirtyfrom) continue;
199 
    if (y > uidirtyto) break;
1282 mateusz.vi 200 
 
1318 mateusz.vi 201 
    x = 0;
1275 mateusz.vi 202 
    if (db->xoffset < l->len) {
1318 mateusz.vi 203 
      unsigned char i, limit;
204 
      if (l->len - db->xoffset < screenw) {
205 
        limit = l->len;
206 
      } else {
207 
        limit = db->xoffset + screenw - 1;
208 
      }
209 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);
1275 mateusz.vi 210 
    }
1282 mateusz.vi 211 
 
1318 mateusz.vi 212 
    /* write empty spaces until end of line */
213 
    if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);
214 
 
1288 mateusz.vi 215 
#ifdef DBG_REFRESH
1282 mateusz.vi 216 
    mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);
1288 mateusz.vi 217 
#endif
1282 mateusz.vi 218 
 
1275 mateusz.vi 219 
    if (y == screenh - 2) break;
220 
  }
1310 mateusz.vi 221 
 
1319 mateusz.vi 222 
  /* fill all lines below if empty (and they need to be redrawn) */
223 
  if (l == NULL) {
224 
    while ((y < screenh - 1) && (y < uidirtyto)) {
225 
      mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);
226 
    }
1318 mateusz.vi 227 
  }
1275 mateusz.vi 228 
}
229 
 
230 
 
1316 mateusz.vi 231 
static void check_cursor_not_after_eol(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
232 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 233 
 
234 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 235 
    db->cursorposx = 0;
1275 mateusz.vi 236 
    db->xoffset = db->cursor->len;
1282 mateusz.vi 237 
    *uidirtyfrom = 0;
238 
    *uidirtyto = 0xff;
1275 mateusz.vi 239 
  } else {
1316 mateusz.vi 240 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 241 
  }
242 
}
243 
 
244 
 
1316 mateusz.vi 245 
static void cursor_up(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
1275 mateusz.vi 246 
  if (db->cursor->prev != NULL) {
247 
    db->cursor = db->cursor->prev;
1316 mateusz.vi 248 
    if (db->cursorposy == 0) {
1282 mateusz.vi 249 
      *uidirtyfrom = 0;
250 
      *uidirtyto = 0xff;
1275 mateusz.vi 251 
    } else {
1316 mateusz.vi 252 
      db->cursorposy -= 1;
1275 mateusz.vi 253 
    }
254 
  }
255 
}
256 
 
257 
 
1316 mateusz.vi 258 
static void cursor_eol(struct file *db, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
1275 mateusz.vi 259 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 260 
  if (db->xoffset > db->cursor->len) {
261 
    db->xoffset = db->cursor->len - 1;
262 
    *uidirtyfrom = 0;
263 
    *uidirtyto = 0xff;
264 
  }
265 
 
266 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
267 
    db->xoffset = db->cursor->len - screenw + 2;
268 
    *uidirtyfrom = 0;
269 
    *uidirtyto = 0xff;
270 
  }
1316 mateusz.vi 271 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 272 
}
273 
 
274 
 
1316 mateusz.vi 275 
static void cursor_down(struct file *db, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
1276 mateusz.vi 276 
  if (db->cursor->next != NULL) {
277 
    db->cursor = db->cursor->next;
1316 mateusz.vi 278 
    if (db->cursorposy < screenh - 2) {
279 
      db->cursorposy += 1;
1276 mateusz.vi 280 
    } else {
1282 mateusz.vi 281 
      *uidirtyfrom = 0;
282 
      *uidirtyto = 0xff;
1276 mateusz.vi 283 
    }
284 
  }
285 
}
286 
 
287 
 
1316 mateusz.vi 288 
static void cursor_left(struct file *db, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
289 
  if (db->cursorposx > 0) {
290 
    db->cursorposx -= 1;
1302 mateusz.vi 291 
  } else if (db->xoffset > 0) {
292 
    db->xoffset -= 1;
293 
    *uidirtyfrom = 0;
294 
    *uidirtyto = 0xff;
295 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1316 mateusz.vi 296 
    cursor_up(db, uidirtyfrom, uidirtyto);
297 
    cursor_eol(db, screenw, uidirtyfrom, uidirtyto);
1302 mateusz.vi 298 
  }
299 
}
300 
 
301 
 
1316 mateusz.vi 302 
static void cursor_home(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
303 
  db->cursorposx = 0;
1282 mateusz.vi 304 
  if (db->xoffset != 0) {
305 
    db->xoffset = 0;
306 
    *uidirtyfrom = 0;
307 
    *uidirtyto = 0xff;
308 
  }
1276 mateusz.vi 309 
}
310 
 
311 
 
1316 mateusz.vi 312 
static void cursor_right(struct file *db, unsigned char screenw, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
313 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
314 
    if (db->cursorposx < screenw - 2) {
315 
      db->cursorposx += 1;
1308 mateusz.vi 316 
    } else {
317 
      db->xoffset += 1;
318 
      *uidirtyfrom = 0;
319 
      *uidirtyto = 0xff;
320 
    }
321 
  } else {
1316 mateusz.vi 322 
    cursor_down(db, screenh, uidirtyfrom, uidirtyto);
323 
    cursor_home(db, uidirtyfrom, uidirtyto);
1308 mateusz.vi 324 
  }
325 
}
326 
 
327 
 
1316 mateusz.vi 328 
static void del(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
329 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
330 
    _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 331 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1316 mateusz.vi 332 
    *uidirtyfrom = db->cursorposy;
333 
    *uidirtyto = db->cursorposy;
1292 mateusz.vi 334 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
335 
    struct line far *nextline = db->cursor->next;
336 
    if (db->cursor->next->len > 0) {
337 
      void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);
338 
      if (newptr != NULL) {
339 
        db->cursor = newptr;
340 
        _fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
341 
        db->cursor->len += db->cursor->next->len;
342 
      }
343 
    }
344 
    db->cursor->next = db->cursor->next->next;
345 
    db->cursor->next->prev = db->cursor;
346 
    if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
347 
    _ffree(nextline);
1316 mateusz.vi 348 
    *uidirtyfrom = db->cursorposy;
1292 mateusz.vi 349 
    *uidirtyto = 0xff;
350 
  }
351 
}
352 
 
353 
 
1316 mateusz.vi 354 
static void bkspc(struct file *db, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
1302 mateusz.vi 355 
 
356 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1316 mateusz.vi 357 
  if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 358 
 
1316 mateusz.vi 359 
  cursor_left(db, screenw, uidirtyfrom, uidirtyto);
360 
  del(db, uidirtyfrom, uidirtyto);
1302 mateusz.vi 361 
}
362 
 
363 
 
1286 mateusz.vi 364 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
365 
 * of argc and argv, saves some 330 bytes of binary size */
366 
static char *parseargv(void) {
367 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
368 
  unsigned char count = 0;
369 
  char *argv[4];
370 
 
371 
  while (count < 4) {
372 
    /* jump to nearest arg */
373 
    while (*tail == ' ') {
374 
      *tail = 0;
375 
      tail++;
376 
    }
377 
 
378 
    if (*tail == '\r') {
379 
      *tail = 0;
380 
      break;
381 
    }
382 
 
383 
    argv[count++] = tail;
384 
 
385 
    /* jump to next delimiter */
386 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
387 
  }
388 
 
389 
  /* check args now */
1321 mateusz.vi 390 
  if (count == 0) return("");
1286 mateusz.vi 391 
 
392 
  return(argv[0]);
393 
}
394 
 
395 
 
1320 mateusz.vi 396 
static struct file *loadfile(const char *fname) {
1287 mateusz.vi 397 
  char buff[1024];
398 
  unsigned int prevlen = 0, len, llen;
399 
  int fd;
1320 mateusz.vi 400 
  struct file *db;
1287 mateusz.vi 401 
 
1321 mateusz.vi 402 
  len = strlen(fname) + 1;
403 
  db = calloc(1, sizeof(struct file) + len);
404 
  if (db == NULL) return(NULL);
405 
  memcpy(db->fname, fname, len);
406 
 
407 
  if (*fname == 0) goto SKIPLOADING;
408 
 
1287 mateusz.vi 409 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
410 
    mdr_coutraw_puts("Failed to open file:");
411 
    mdr_coutraw_puts(fname);
1321 mateusz.vi 412 
    free(db);
1320 mateusz.vi 413 
    return(NULL);
1287 mateusz.vi 414 
  }
415 
 
1313 mateusz.vi 416 
  db->lfonly = 1;
417 
 
1287 mateusz.vi 418 
  do {
419 
    if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {
420 
      len += prevlen;
421 
    } else {
422 
      len = prevlen;
423 
    }
424 
 
425 
    /* look for nearest \n and replace with 0*/
426 
    for (llen = 0; buff[llen] != '\n'; llen++) {
1320 mateusz.vi 427 
      if (llen == sizeof(buff)) { /* TODO line too long: handle it in some classy way */
428 
        break;
429 
      }
1287 mateusz.vi 430 
    }
431 
    buff[llen] = 0;
1313 mateusz.vi 432 
    if ((llen > 0) && (buff[llen - 1] == '\r')) {
433 
      buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */
434 
      db->lfonly = 0;
435 
    }
1287 mateusz.vi 436 
    if (line_add(db, buff) != 0) {
437 
      mdr_coutraw_puts("out of memory");
1320 mateusz.vi 438 
      free(db);
439 
      db = NULL;
1287 mateusz.vi 440 
      break;
441 
    }
442 
 
443 
    len -= llen + 1;
444 
    memmove(buff, buff + llen + 1, len);
445 
    prevlen = len;
446 
  } while (len > 0);
447 
 
448 
  _dos_close(fd);
449 
 
1321 mateusz.vi 450 
  SKIPLOADING:
451 
 
1320 mateusz.vi 452 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
453 
  if (db != NULL) {
1321 mateusz.vi 454 
    if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, "");
1320 mateusz.vi 455 
    db_rewind(db);
456 
  }
457 
 
458 
  return(db);
1287 mateusz.vi 459 
}
460 
 
461 
 
1320 mateusz.vi 462 
static int savefile(const struct file *db) {
1311 mateusz.vi 463 
  int fd;
464 
  const struct line far *l;
465 
  unsigned bytes;
1313 mateusz.vi 466 
  unsigned char eollen;
467 
  unsigned char eolbuf[2];
468 
 
1320 mateusz.vi 469 
  if (_dos_open(db->fname, O_WRONLY, &fd) != 0) {
1311 mateusz.vi 470 
    return(-1);
471 
  }
472 
 
473 
  l = db->cursor;
474 
  while (l->prev) l = l->prev;
475 
 
1313 mateusz.vi 476 
  /* preset line terminators */
477 
  if (db->lfonly) {
478 
    eolbuf[0] = '\n';
479 
    eollen = 1;
480 
  } else {
481 
    eolbuf[0] = '\r';
482 
    eolbuf[1] = '\n';
483 
    eollen = 2;
484 
  }
485 
 
1311 mateusz.vi 486 
  while (l) {
487 
    _dos_write(fd, l->payload, l->len, &bytes);
1313 mateusz.vi 488 
    _dos_write(fd, eolbuf, eollen, &bytes);
1311 mateusz.vi 489 
    l = l->next;
490 
  }
491 
 
492 
  _dos_close(fd);
493 
  return(0);
494 
}
495 
 
496 
 
1317 mateusz.vi 497 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len, unsigned char screenw, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
498 
  struct line far *n;
499 
  n = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + len);
500 
  if (n != NULL) {
501 
    unsigned short off = db->xoffset + db->cursorposx;
502 
    if (n->prev) n->prev->next = n;
503 
    if (n->next) n->next->prev = n;
504 
    db->cursor = n;
505 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
506 
    db->cursor->len += len;
507 
    *uidirtyfrom = db->cursorposy;
508 
    *uidirtyto = db->cursorposy;
509 
    while (len--) {
510 
      db->cursor->payload[off++] = *databuf;
511 
      databuf++;
512 
      cursor_right(db, screenw, screenh, uidirtyfrom, uidirtyto);
513 
    }
514 
  }
515 
}
516 
 
517 
 
1286 mateusz.vi 518 
int main(void) {
519 
  const char *fname;
1320 mateusz.vi 520 
  struct file *db;
1275 mateusz.vi 521 
  unsigned char screenw = 0, screenh = 0;
1282 mateusz.vi 522 
  unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */
1275 mateusz.vi 523 
 
1307 mateusz.vi 524 
  {
525 
    char nlspath[128], lang[8];
526 
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
527 
  }
1282 mateusz.vi 528 
 
1286 mateusz.vi 529 
  fname = parseargv();
530 
 
531 
  if (fname == NULL) {
1302 mateusz.vi 532 
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
1275 mateusz.vi 533 
    return(0);
534 
  }
535 
 
1282 mateusz.vi 536 
  /* load file */
1320 mateusz.vi 537 
  db = loadfile(fname);
538 
  if (db == NULL) return(1);
1282 mateusz.vi 539 
 
1275 mateusz.vi 540 
  if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();
1320 mateusz.vi 541 
  ui_basic(screenw, screenh, db);
1275 mateusz.vi 542 
 
543 
  for (;;) {
544 
    int k;
545 
 
1320 mateusz.vi 546 
    check_cursor_not_after_eol(db, &uidirtyfrom, &uidirtyto);
547 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 548 
 
1282 mateusz.vi 549 
    if (uidirtyfrom != 0xff) {
1320 mateusz.vi 550 
      ui_refresh(db, screenw, screenh, uidirtyfrom, uidirtyto);
1282 mateusz.vi 551 
      uidirtyfrom = 0xff;
552 
    }
1275 mateusz.vi 553 
 
554 
    k = keyb_getkey();
1282 mateusz.vi 555 
 
1275 mateusz.vi 556 
    if (k == 0x150) { /* down */
1320 mateusz.vi 557 
      cursor_down(db, screenh, &uidirtyfrom, &uidirtyto);
1275 mateusz.vi 558 
 
559 
    } else if (k == 0x148) { /* up */
1320 mateusz.vi 560 
      cursor_up(db, &uidirtyfrom, &uidirtyto);
1275 mateusz.vi 561 
 
562 
    } else if (k == 0x14D) { /* right */
1320 mateusz.vi 563 
      cursor_right(db, screenw, screenh, &uidirtyfrom, &uidirtyto);
1275 mateusz.vi 564 
 
565 
    } else if (k == 0x14B) { /* left */
1320 mateusz.vi 566 
      cursor_left(db, screenw, &uidirtyfrom, &uidirtyto);
1275 mateusz.vi 567 
 
1282 mateusz.vi 568 
    } else if (k == 0x149) { /* pgup */
569 
      // TODO
570 
 
571 
    } else if (k == 0x151) { /* pgdown */
572 
      // TODO
573 
 
574 
    } else if (k == 0x147) { /* home */
1320 mateusz.vi 575 
       cursor_home(db, &uidirtyfrom, &uidirtyto);
1282 mateusz.vi 576 
 
577 
    } else if (k == 0x14F) { /* end */
1320 mateusz.vi 578 
       cursor_eol(db, screenw, &uidirtyfrom, &uidirtyto);
1282 mateusz.vi 579 
 
1275 mateusz.vi 580 
    } else if (k == 0x1B) { /* ESC */
581 
      break;
582 
 
1289 mateusz.vi 583 
    } else if (k == 0x0D) { /* ENTER */
584 
      /* add a new line */
1320 mateusz.vi 585 
      if (line_add(db, db->cursor->payload + db->xoffset + db->cursorposx) == 0) {
1289 mateusz.vi 586 
        /* trim the line above */
1320 mateusz.vi 587 
        db->cursor->prev->len = db->xoffset + db->cursorposx;
588 
        db->cursor->prev->payload[db->cursor->prev->len] = 0;
1289 mateusz.vi 589 
        /* move cursor to the (new) line below */
1320 mateusz.vi 590 
        db->cursorposx = 0;
591 
        if (db->cursorposy < screenh - 2) {
592 
          uidirtyfrom = db->cursorposy;
593 
          db->cursorposy++;
1289 mateusz.vi 594 
        } else {
595 
          uidirtyfrom = 0;
596 
        }
597 
        uidirtyto = 0xff;
598 
      } else {
599 
        /* ERROR: OUT OF MEMORY */
600 
      }
601 
 
1292 mateusz.vi 602 
    } else if (k == 0x153) {  /* DEL */
1320 mateusz.vi 603 
      del(db, &uidirtyfrom, &uidirtyto);
1292 mateusz.vi 604 
 
1302 mateusz.vi 605 
    } else if (k == 0x008) { /* BKSPC */
1320 mateusz.vi 606 
      bkspc(db, screenw, &uidirtyfrom, &uidirtyto);
1302 mateusz.vi 607 
 
1308 mateusz.vi 608 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 609 
      char c = k;
1320 mateusz.vi 610 
      insert_in_line(db, &c, 1, screenw, screenh, &uidirtyfrom, &uidirtyto);
1308 mateusz.vi 611 
 
1317 mateusz.vi 612 
    } else if (k == 0x009) { /* TAB */
613 
      const char *tab = "        ";
1320 mateusz.vi 614 
      insert_in_line(db, tab, 8, screenw, screenh, &uidirtyfrom, &uidirtyto);
1317 mateusz.vi 615 
 
1309 mateusz.vi 616 
    } else if (k == 0x13b) { /* F1 */
617 
      ui_help(screenw);
618 
      uidirtyfrom = 0;
619 
      uidirtyto = 0xff;
620 
 
1311 mateusz.vi 621 
    } else if (k == 0x13f) { /* F5 */
1312 mateusz.vi 622 
      const char *m[] = {"SAVED", "SAVING FILE FAILED"};
623 
      int i;
1320 mateusz.vi 624 
      i = !!savefile(db);
1312 mateusz.vi 625 
      ui_msg(m[i], screenw, screenh, &uidirtyfrom, &uidirtyto);
626 
      mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
1311 mateusz.vi 627 
 
1314 mateusz.vi 628 
    } else if (k == 0x144) { /* F10 */
1320 mateusz.vi 629 
      db->lfonly ^= 1;
630 
      ui_basic(screenw, screenh, db);
1314 mateusz.vi 631 
 
1282 mateusz.vi 632 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
633 
      char buff[4];
634 
      const char *HEX = "0123456789ABCDEF";
635 
      buff[0] = HEX[(k >> 8) & 15];
636 
      buff[1] = HEX[(k >> 4) & 15];
637 
      buff[2] = HEX[k & 15];
638 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", scheme[COL_STATUSBAR1], 17);
639 
      mdr_cout_str(screenh - 1, 17, buff, scheme[COL_STATUSBAR1], 3);
1275 mateusz.vi 640 
      keyb_getkey();
641 
      break;
642 
    }
643 
  }
644 
 
645 
  mdr_cout_close();
646 
 
1320 mateusz.vi 647 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 648 
 
649 
  return(0);
650 
}