Subversion Repositories SvarDOS

Rev

Rev 1327 | Rev 1330 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

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