Subversion Repositories SvarDOS

Rev

Rev 1339 | Rev 1341 | 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 
 
1338 mateusz.vi 26 
#include <dos.h>      /* _dos_open(), _dos_read(), _dos_close(), ... */
27 
#include <fcntl.h>    /* O_RDONLY, O_WRONLY */
1275 mateusz.vi 28 
#include <stdlib.h>
29 
#include <string.h>
30 
 
1312 mateusz.vi 31 
#include "mdr\bios.h"
1275 mateusz.vi 32 
#include "mdr\cout.h"
1307 mateusz.vi 33 
#include "mdr\dos.h"
1275 mateusz.vi 34 
#include "mdr\keyb.h"
35 
 
1282 mateusz.vi 36 
#include "svarlang\svarlang.h"
37 
 
1326 mateusz.vi 38 
 
39 
/*****************************************************************************
40 
 * global variables and definitions                                          *
41 
 *****************************************************************************/
42 
 
1275 mateusz.vi 43 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
1333 mateusz.vi 44 
static unsigned char SCHEME_TEXT   = 0x07,
45 
                     SCHEME_STBAR1 = 0x70,
46 
                     SCHEME_STBAR2 = 0x70,
47 
                     SCHEME_STBAR3 = 0xf0,
48 
                     SCHEME_SCROLL = 0x70,
49 
                     SCHEME_MSG    = 0x70,
50 
                     SCHEME_ERR    = 0xf0;
1327 mateusz.vi 51 
 
1326 mateusz.vi 52 
static unsigned char screenw, screenh;
1275 mateusz.vi 53 
 
1327 mateusz.vi 54 
static struct {
55 
    unsigned char from;
56 
    unsigned char to;
57 
} uidirty = {0, 0xff}; /* make sure to redraw entire UI at first run */
58 
 
1275 mateusz.vi 59 
#define SCROLL_CURSOR 0xB1
60 
 
61 
struct line {
1288 mateusz.vi 62 
  struct line far *prev;
63 
  struct line far *next;
1275 mateusz.vi 64 
  unsigned short len;
65 
  char payload[1];
66 
};
67 
 
1315 mateusz.vi 68 
struct file {
1320 mateusz.vi 69 
  int fd;
1288 mateusz.vi 70 
  struct line far *cursor;
1275 mateusz.vi 71 
  unsigned short xoffset;
1316 mateusz.vi 72 
  unsigned char cursorposx;
73 
  unsigned char cursorposy;
1328 mateusz.vi 74 
  unsigned short totlines;
75 
  unsigned short curline;
1330 mateusz.vi 76 
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
77 
  char modflag;  /* non-zero if file has been modified since last save */
1332 mateusz.vi 78 
  char fname[128];
1275 mateusz.vi 79 
};
80 
 
81 
 
1326 mateusz.vi 82 
/*****************************************************************************
83 
 * functions                                                                 *
84 
 *****************************************************************************/
85 
 
1339 mateusz.vi 86 
static struct line far *line_calloc(unsigned short siz) {
87 
  unsigned int seg;
88 
  if (_dos_allocmem((sizeof(struct line) + siz) / 16 + 1, &seg) != 0) return(NULL);
89 
  _fmemset(MK_FP(seg, 0), 0, siz);
90 
  return(MK_FP(seg, 0));
91 
}
92 
 
93 
 
94 
static void line_free(struct line far *ptr) {
95 
  _dos_freemem(FP_SEG(ptr));
96 
}
97 
 
98 
 
1340 mateusz.vi 99 
static signed char curline_resize(struct file far *db, unsigned short newsiz) {
1339 mateusz.vi 100 
  unsigned int maxavail;
101 
  struct line far *newptr;
102 
 
103 
  /* try resizing the block (faster) */
1340 mateusz.vi 104 
  if (_dos_setblock((sizeof(struct line) + newsiz) / 16 + 1, FP_SEG(db->cursor), &maxavail) == 0) return(0);
1339 mateusz.vi 105 
 
106 
  /* create a new block and copy data over */
107 
  newptr = line_calloc(newsiz);
1340 mateusz.vi 108 
  if (newptr == NULL) return(-1);
109 
  _fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
110 
 
111 
  /* rewire the linked list */
112 
  db->cursor = newptr;
113 
  if (newptr->next) newptr->next->prev = newptr;
114 
  if (newptr->prev) newptr->prev->next = newptr;
115 
 
116 
  return(0);
1339 mateusz.vi 117 
}
118 
 
119 
 
1328 mateusz.vi 120 
/* adds a new line at cursor position into file linked list and advance cursor
1324 mateusz.vi 121 
 * returns non-zero on error */
1328 mateusz.vi 122 
static int line_add(struct file *db, const char far *line, unsigned short slen) {
1288 mateusz.vi 123 
  struct line far *l;
1275 mateusz.vi 124 
 
1339 mateusz.vi 125 
  l = line_calloc(slen);
1287 mateusz.vi 126 
  if (l == NULL) return(-1);
127 
 
1275 mateusz.vi 128 
  l->prev = db->cursor;
129 
  if (db->cursor) {
130 
    l->next = db->cursor->next;
131 
    db->cursor->next = l;
132 
    l->next->prev = l;
133 
  }
134 
  db->cursor = l;
1337 mateusz.vi 135 
  _fmemmove(l->payload, line, slen);
1275 mateusz.vi 136 
  l->len = slen;
1287 mateusz.vi 137 
 
1328 mateusz.vi 138 
  db->totlines += 1;
139 
  db->curline += 1;
140 
 
1287 mateusz.vi 141 
  return(0);
1275 mateusz.vi 142 
}
143 
 
144 
 
1332 mateusz.vi 145 
static void ui_getstring(const char *query, char *s, unsigned char maxlen) {
146 
  unsigned char len = 0, y, x;
147 
  int k;
148 
 
149 
  if (maxlen == 0) return;
150 
  maxlen--; /* make room for the nul terminator */
151 
 
152 
  y = screenh - 1;
153 
 
154 
  /* print query string */
1333 mateusz.vi 155 
  x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);
156 
  mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);
1332 mateusz.vi 157 
 
158 
  for (;;) {
159 
    mdr_cout_locate(y, x + len);
160 
    k = keyb_getkey();
161 
 
162 
    if (k == 0x1b) return; /* ESC */
163 
 
164 
    if (k == '\r') {
165 
      s[len] = 0;
166 
      return;
167 
    }
168 
 
169 
    if ((k == 0x08) && (len > 0)) { /* BKSPC */
170 
      len--;
1333 mateusz.vi 171 
      mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);
1332 mateusz.vi 172 
      continue;
173 
    }
174 
 
175 
    if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
1333 mateusz.vi 176 
      mdr_cout_char(y, x + len, k, SCHEME_STBAR3);
1332 mateusz.vi 177 
      s[len++] = k;
178 
    }
179 
 
180 
  }
181 
}
182 
 
183 
 
1324 mateusz.vi 184 
/* append a nul-terminated string to line at cursor position */
185 
static int line_append(struct file *f, const char far *buf, unsigned short len) {
186 
  if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */
1340 mateusz.vi 187 
  if (curline_resize(f, f->cursor->len + len) != 0) return(-1);
1337 mateusz.vi 188 
  _fmemmove(f->cursor->payload + f->cursor->len, buf, len);
1324 mateusz.vi 189 
  f->cursor->len += len;
190 
 
191 
  return(0);
192 
}
193 
 
194 
 
1315 mateusz.vi 195 
static void db_rewind(struct file *db) {
1275 mateusz.vi 196 
  if (db->cursor == NULL) return;
197 
  while (db->cursor->prev) db->cursor = db->cursor->prev;
1328 mateusz.vi 198 
  db->curline = 0;
1275 mateusz.vi 199 
}
200 
 
201 
 
1326 mateusz.vi 202 
static void ui_basic(const struct file *db) {
1302 mateusz.vi 203 
  const char *s = svarlang_strid(0); /* HELP */
1335 mateusz.vi 204 
  unsigned char helpcol = screenw - strlen(s);
1275 mateusz.vi 205 
 
1330 mateusz.vi 206 
  /* fill status bar with background (without modflag as it is refreshed by ui_refresh) */
1333 mateusz.vi 207 
  mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);
1313 mateusz.vi 208 
 
209 
  /* filename */
1330 mateusz.vi 210 
  {
211 
    const char *fn = db->fname;
212 
    if (*fn == 0) fn = svarlang_str(0, 1);
1333 mateusz.vi 213 
    mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);
1321 mateusz.vi 214 
  }
1313 mateusz.vi 215 
 
216 
  /* eol type */
1330 mateusz.vi 217 
  {
218 
    const char *eoltype = "CRLF";
219 
    if (db->lfonly) eoltype = "LF";
1335 mateusz.vi 220 
    mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);
1275 mateusz.vi 221 
  }
1313 mateusz.vi 222 
 
1335 mateusz.vi 223 
  mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);
1275 mateusz.vi 224 
}
225 
 
226 
 
1331 mateusz.vi 227 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
1312 mateusz.vi 228 
  unsigned short x, y, msglen, i;
1331 mateusz.vi 229 
  unsigned char msg2flag = 0;
230 
 
231 
  msglen = strlen(msg1);
232 
  if (msg2) {
233 
    msg2flag = 1;
234 
    i = strlen(msg2);
235 
    if (i > msglen) msglen = i;
236 
  }
237 
 
238 
  y = (screenh - 6) >> 1;
1312 mateusz.vi 239 
  x = (screenw - msglen - 4) >> 1;
1331 mateusz.vi 240 
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
241 
  x++;
242 
  mdr_cout_str(y+1, x, msg1, attr, msglen);
243 
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
1312 mateusz.vi 244 
 
1327 mateusz.vi 245 
  if (uidirty.from > y) uidirty.from = y;
1331 mateusz.vi 246 
  if (uidirty.to < y+4) uidirty.to = y+4;
1312 mateusz.vi 247 
}
248 
 
249 
 
1326 mateusz.vi 250 
static void ui_help(void) {
1309 mateusz.vi 251 
#define MAXLINLEN 35
1336 mateusz.vi 252 
  unsigned char i, offset;
1325 mateusz.vi 253 
  offset = (screenw - MAXLINLEN + 2) >> 1;
1335 mateusz.vi 254 
 
255 
  for (i = 2; i < 18; i++) {
1333 mateusz.vi 256 
    mdr_cout_char_rep(i, offset - 2, ' ', SCHEME_STBAR1, MAXLINLEN + 2);
1309 mateusz.vi 257 
  }
258 
 
1335 mateusz.vi 259 
  for (i = 0; i < 20; i++) {
1337 mateusz.vi 260 
    const char *s = svarlang_str(8, i);
1335 mateusz.vi 261 
    if (s[0] == 0) break;
262 
    if (s[0] == '.') continue;
1336 mateusz.vi 263 
    mdr_cout_locate(3 + i, offset + mdr_cout_str(3 + i, offset, s, SCHEME_STBAR1, MAXLINLEN));
1309 mateusz.vi 264 
  }
265 
 
266 
  keyb_getkey();
267 
#undef MAXLINLEN
268 
}
269 
 
270 
 
1327 mateusz.vi 271 
static void ui_refresh(const struct file *db) {
1318 mateusz.vi 272 
  unsigned char x;
1310 mateusz.vi 273 
  const struct line far *l;
1316 mateusz.vi 274 
  unsigned char y = db->cursorposy;
1275 mateusz.vi 275 
 
1288 mateusz.vi 276 
#ifdef DBG_REFRESH
1282 mateusz.vi 277 
  static char m = 'a';
278 
  m++;
279 
  if (m > 'z') m = 'a';
1288 mateusz.vi 280 
#endif
1282 mateusz.vi 281 
 
1310 mateusz.vi 282 
  /* rewind cursor line to first line that needs redrawing */
1327 mateusz.vi 283 
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
1282 mateusz.vi 284 
 
1310 mateusz.vi 285 
  /* iterate over lines and redraw whatever needs to be redrawn */
286 
  for (; l != NULL; l = l->next, y++) {
287 
 
288 
    /* skip lines that do not need to be refreshed */
1327 mateusz.vi 289 
    if (y < uidirty.from) continue;
290 
    if (y > uidirty.to) break;
1282 mateusz.vi 291 
 
1318 mateusz.vi 292 
    x = 0;
1275 mateusz.vi 293 
    if (db->xoffset < l->len) {
1318 mateusz.vi 294 
      unsigned char i, limit;
295 
      if (l->len - db->xoffset < screenw) {
296 
        limit = l->len;
297 
      } else {
298 
        limit = db->xoffset + screenw - 1;
299 
      }
1333 mateusz.vi 300 
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
1275 mateusz.vi 301 
    }
1282 mateusz.vi 302 
 
1318 mateusz.vi 303 
    /* write empty spaces until end of line */
1333 mateusz.vi 304 
    if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);
1318 mateusz.vi 305 
 
1288 mateusz.vi 306 
#ifdef DBG_REFRESH
1333 mateusz.vi 307 
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
1288 mateusz.vi 308 
#endif
1282 mateusz.vi 309 
 
1275 mateusz.vi 310 
    if (y == screenh - 2) break;
311 
  }
1310 mateusz.vi 312 
 
1319 mateusz.vi 313 
  /* fill all lines below if empty (and they need to be redrawn) */
314 
  if (l == NULL) {
1327 mateusz.vi 315 
    while ((y < screenh - 1) && (y < uidirty.to)) {
1333 mateusz.vi 316 
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);
1319 mateusz.vi 317 
    }
1318 mateusz.vi 318 
  }
1328 mateusz.vi 319 
 
1330 mateusz.vi 320 
  /* "file changed" flag */
321 
  {
322 
    char flg = ' ';
323 
    if (db->modflag) flg = '*';
1333 mateusz.vi 324 
    mdr_cout_char(screenh - 1, 0, flg, SCHEME_STBAR1);
1330 mateusz.vi 325 
  }
326 
 
1328 mateusz.vi 327 
  /* scroll bar */
328 
  for (y = 0; y < (screenh - 1); y++) {
1333 mateusz.vi 329 
    mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);
1328 mateusz.vi 330 
  }
331 
 
332 
  /* scroll cursor */
333 
  if (db->totlines >= screenh) {
334 
    unsigned short topline = db->curline - db->cursorposy;
335 
    unsigned short col;
336 
    unsigned short totlines = db->totlines - screenh + 1;
337 
    if (db->totlines - screenh > screenh) {
338 
      col = topline / (totlines / (screenh - 1));
339 
    } else {
340 
      col = topline * (screenh - 1) / totlines;
341 
    }
342 
    if (col >= screenh - 1) col = screenh - 2;
1333 mateusz.vi 343 
    mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);
1328 mateusz.vi 344 
  }
1275 mateusz.vi 345 
}
346 
 
347 
 
1327 mateusz.vi 348 
static void check_cursor_not_after_eol(struct file *db) {
1316 mateusz.vi 349 
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
1275 mateusz.vi 350 
 
351 
  if (db->cursor->len < db->xoffset) {
1316 mateusz.vi 352 
    db->cursorposx = 0;
1275 mateusz.vi 353 
    db->xoffset = db->cursor->len;
1327 mateusz.vi 354 
    uidirty.from = 0;
355 
    uidirty.to = 0xff;
1275 mateusz.vi 356 
  } else {
1316 mateusz.vi 357 
    db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 358 
  }
359 
}
360 
 
361 
 
1327 mateusz.vi 362 
static void cursor_up(struct file *db) {
1275 mateusz.vi 363 
  if (db->cursor->prev != NULL) {
1328 mateusz.vi 364 
    db->curline -= 1;
1275 mateusz.vi 365 
    db->cursor = db->cursor->prev;
1316 mateusz.vi 366 
    if (db->cursorposy == 0) {
1327 mateusz.vi 367 
      uidirty.from = 0;
368 
      uidirty.to = 0xff;
1275 mateusz.vi 369 
    } else {
1316 mateusz.vi 370 
      db->cursorposy -= 1;
1275 mateusz.vi 371 
    }
372 
  }
373 
}
374 
 
375 
 
1327 mateusz.vi 376 
static void cursor_eol(struct file *db) {
1275 mateusz.vi 377 
  /* adjust xoffset to make sure eol is visible on screen */
1282 mateusz.vi 378 
  if (db->xoffset > db->cursor->len) {
379 
    db->xoffset = db->cursor->len - 1;
1327 mateusz.vi 380 
    uidirty.from = 0;
381 
    uidirty.to = 0xff;
1282 mateusz.vi 382 
  }
383 
 
384 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
385 
    db->xoffset = db->cursor->len - screenw + 2;
1327 mateusz.vi 386 
    uidirty.from = 0;
387 
    uidirty.to = 0xff;
1282 mateusz.vi 388 
  }
1316 mateusz.vi 389 
  db->cursorposx = db->cursor->len - db->xoffset;
1275 mateusz.vi 390 
}
391 
 
392 
 
1327 mateusz.vi 393 
static void cursor_down(struct file *db) {
1276 mateusz.vi 394 
  if (db->cursor->next != NULL) {
1328 mateusz.vi 395 
    db->curline += 1;
1276 mateusz.vi 396 
    db->cursor = db->cursor->next;
1316 mateusz.vi 397 
    if (db->cursorposy < screenh - 2) {
398 
      db->cursorposy += 1;
1276 mateusz.vi 399 
    } else {
1327 mateusz.vi 400 
      uidirty.from = 0;
401 
      uidirty.to = 0xff;
1276 mateusz.vi 402 
    }
403 
  }
404 
}
405 
 
406 
 
1327 mateusz.vi 407 
static void cursor_left(struct file *db) {
1316 mateusz.vi 408 
  if (db->cursorposx > 0) {
409 
    db->cursorposx -= 1;
1302 mateusz.vi 410 
  } else if (db->xoffset > 0) {
411 
    db->xoffset -= 1;
1327 mateusz.vi 412 
    uidirty.from = 0;
413 
    uidirty.to = 0xff;
1302 mateusz.vi 414 
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
1327 mateusz.vi 415 
    cursor_up(db);
416 
    cursor_eol(db);
1302 mateusz.vi 417 
  }
418 
}
419 
 
420 
 
1327 mateusz.vi 421 
static void cursor_home(struct file *db) {
1316 mateusz.vi 422 
  db->cursorposx = 0;
1282 mateusz.vi 423 
  if (db->xoffset != 0) {
424 
    db->xoffset = 0;
1327 mateusz.vi 425 
    uidirty.from = 0;
426 
    uidirty.to = 0xff;
1282 mateusz.vi 427 
  }
1276 mateusz.vi 428 
}
429 
 
430 
 
1327 mateusz.vi 431 
static void cursor_right(struct file *db) {
1316 mateusz.vi 432 
  if (db->cursor->len > db->xoffset + db->cursorposx) {
433 
    if (db->cursorposx < screenw - 2) {
434 
      db->cursorposx += 1;
1308 mateusz.vi 435 
    } else {
436 
      db->xoffset += 1;
1327 mateusz.vi 437 
      uidirty.from = 0;
438 
      uidirty.to = 0xff;
1308 mateusz.vi 439 
    }
440 
  } else {
1327 mateusz.vi 441 
    cursor_down(db);
442 
    cursor_home(db);
1308 mateusz.vi 443 
  }
444 
}
445 
 
446 
 
1327 mateusz.vi 447 
static void del(struct file *db) {
1316 mateusz.vi 448 
  if (db->cursorposx + db->xoffset < db->cursor->len) {
449 
    _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 450 
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
1327 mateusz.vi 451 
    uidirty.from = db->cursorposy;
452 
    uidirty.to = db->cursorposy;
1330 mateusz.vi 453 
    db->modflag = 1;
1292 mateusz.vi 454 
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
455 
    struct line far *nextline = db->cursor->next;
456 
    if (db->cursor->next->len > 0) {
1340 mateusz.vi 457 
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
1337 mateusz.vi 458 
        _fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
1292 mateusz.vi 459 
        db->cursor->len += db->cursor->next->len;
460 
      }
461 
    }
1340 mateusz.vi 462 
 
1292 mateusz.vi 463 
    db->cursor->next = db->cursor->next->next;
464 
    db->cursor->next->prev = db->cursor;
1340 mateusz.vi 465 
 
1339 mateusz.vi 466 
    line_free(nextline);
1327 mateusz.vi 467 
    uidirty.from = db->cursorposy;
468 
    uidirty.to = 0xff;
1328 mateusz.vi 469 
    db->totlines -= 1;
1330 mateusz.vi 470 
    db->modflag = 1;
1292 mateusz.vi 471 
  }
472 
}
473 
 
474 
 
1327 mateusz.vi 475 
static void bkspc(struct file *db) {
1302 mateusz.vi 476 
 
477 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
1316 mateusz.vi 478 
  if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
1302 mateusz.vi 479 
 
1327 mateusz.vi 480 
  cursor_left(db);
481 
  del(db);
1302 mateusz.vi 482 
}
483 
 
484 
 
1286 mateusz.vi 485 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
486 
 * of argc and argv, saves some 330 bytes of binary size */
487 
static char *parseargv(void) {
488 
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
489 
  unsigned char count = 0;
490 
  char *argv[4];
491 
 
492 
  while (count < 4) {
493 
    /* jump to nearest arg */
494 
    while (*tail == ' ') {
495 
      *tail = 0;
496 
      tail++;
497 
    }
498 
 
499 
    if (*tail == '\r') {
500 
      *tail = 0;
501 
      break;
502 
    }
503 
 
504 
    argv[count++] = tail;
505 
 
506 
    /* jump to next delimiter */
507 
    while ((*tail != ' ') && (*tail != '\r')) tail++;
508 
  }
509 
 
510 
  /* check args now */
1321 mateusz.vi 511 
  if (count == 0) return("");
1286 mateusz.vi 512 
 
513 
  return(argv[0]);
514 
}
515 
 
516 
 
1320 mateusz.vi 517 
static struct file *loadfile(const char *fname) {
1324 mateusz.vi 518 
  char buff[512]; /* read one entire sector at a time (faster) */
519 
  char *buffptr;
520 
  unsigned int len, llen;
1287 mateusz.vi 521 
  int fd;
1324 mateusz.vi 522 
  unsigned char eolfound;
1339 mateusz.vi 523 
  static struct file db[1];
1287 mateusz.vi 524 
 
1339 mateusz.vi 525 
  bzero(db, sizeof(db));
526 
  memcpy(db->fname, fname, strlen(fname));
1321 mateusz.vi 527 
 
528 
  if (*fname == 0) goto SKIPLOADING;
529 
 
1287 mateusz.vi 530 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
531 
    mdr_coutraw_puts("Failed to open file:");
532 
    mdr_coutraw_puts(fname);
1320 mateusz.vi 533 
    return(NULL);
1287 mateusz.vi 534 
  }
535 
 
1313 mateusz.vi 536 
  db->lfonly = 1;
537 
 
1324 mateusz.vi 538 
  /* start by adding an empty line */
1328 mateusz.vi 539 
  if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 540 
    /* TODO ERROR HANDLING */
541 
  }
1287 mateusz.vi 542 
 
1324 mateusz.vi 543 
  for (eolfound = 0;;) {
544 
    unsigned short consumedbytes;
545 
 
546 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
547 
    buffptr = buff;
548 
 
549 
    FINDLINE:
550 
 
551 
    /* look for nearest \n */
552 
    for (consumedbytes = 0;; consumedbytes++) {
553 
      if (consumedbytes == len) {
554 
        llen = consumedbytes;
555 
        break;
1323 mateusz.vi 556 
      }
1324 mateusz.vi 557 
      if (buffptr[consumedbytes] == '\r') {
558 
        llen = consumedbytes;
559 
        consumedbytes++;
560 
        db->lfonly = 0;
1320 mateusz.vi 561 
        break;
562 
      }
1324 mateusz.vi 563 
      if (buffptr[consumedbytes] == '\n') {
564 
        eolfound = 1;
565 
        llen = consumedbytes;
566 
        consumedbytes++;
567 
        break;
568 
      }
1287 mateusz.vi 569 
    }
1324 mateusz.vi 570 
 
571 
    /* consumedbytes is the amount of bytes processed from buffptr,
572 
     * llen is the length of line's payload (without its line terminator) */
573 
 
574 
    /* append content, if line is non-empty */
575 
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
1287 mateusz.vi 576 
      mdr_coutraw_puts("out of memory");
1339 mateusz.vi 577 
      goto IOERR;
1287 mateusz.vi 578 
    }
579 
 
1324 mateusz.vi 580 
    /* add a new line if necessary */
581 
    if (eolfound) {
1328 mateusz.vi 582 
      if (line_add(db, NULL, 0) != 0) {
1324 mateusz.vi 583 
      /* TODO ERROR HANDLING */
584 
        mdr_coutraw_puts("out of memory");
1339 mateusz.vi 585 
        goto IOERR;
1324 mateusz.vi 586 
      }
587 
      eolfound = 0;
588 
    }
1287 mateusz.vi 589 
 
1324 mateusz.vi 590 
    /* anything left? process the buffer leftover again */
591 
    if (consumedbytes < len) {
592 
      len -= consumedbytes;
593 
      buffptr += consumedbytes;
594 
      goto FINDLINE;
595 
    }
596 
 
597 
  }
598 
 
1287 mateusz.vi 599 
  _dos_close(fd);
600 
 
1321 mateusz.vi 601 
  SKIPLOADING:
602 
 
1320 mateusz.vi 603 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
1339 mateusz.vi 604 
  if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
605 
  db_rewind(db);
1320 mateusz.vi 606 
 
607 
  return(db);
1339 mateusz.vi 608 
 
609 
  IOERR:
610 
  _dos_close(fd);
611 
  return(NULL);
1287 mateusz.vi 612 
}
613 
 
614 
 
1332 mateusz.vi 615 
static int savefile(const struct file *db, const char *newfname) {
1311 mateusz.vi 616 
  int fd;
617 
  const struct line far *l;
618 
  unsigned bytes;
1313 mateusz.vi 619 
  unsigned char eollen;
620 
  unsigned char eolbuf[2];
1332 mateusz.vi 621 
  int errflag = 0;
1313 mateusz.vi 622 
 
1332 mateusz.vi 623 
  /* either create a new file if newfname provided, or... */
624 
  if (newfname) {
625 
    if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
626 
  } else { /* ...open db->fname */
627 
    if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
1311 mateusz.vi 628 
  }
629 
 
630 
  l = db->cursor;
631 
  while (l->prev) l = l->prev;
632 
 
1313 mateusz.vi 633 
  /* preset line terminators */
634 
  if (db->lfonly) {
635 
    eolbuf[0] = '\n';
636 
    eollen = 1;
637 
  } else {
638 
    eolbuf[0] = '\r';
639 
    eolbuf[1] = '\n';
640 
    eollen = 2;
641 
  }
642 
 
1311 mateusz.vi 643 
  while (l) {
1324 mateusz.vi 644 
    /* do not write the last empty line, it is only useful for edition */
645 
    if (l->len != 0) {
1332 mateusz.vi 646 
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
1324 mateusz.vi 647 
    } else if (l->next == NULL) {
648 
      break;
649 
    }
1332 mateusz.vi 650 
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
1311 mateusz.vi 651 
    l = l->next;
652 
  }
653 
 
1332 mateusz.vi 654 
  errflag |= _dos_close(fd);
1330 mateusz.vi 655 
 
1332 mateusz.vi 656 
  return(errflag);
1311 mateusz.vi 657 
}
658 
 
659 
 
1327 mateusz.vi 660 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
1340 mateusz.vi 661 
  if (curline_resize(db, db->cursor->len + len) == 0) {
1317 mateusz.vi 662 
    unsigned short off = db->xoffset + db->cursorposx;
1330 mateusz.vi 663 
    db->modflag = 1;
1317 mateusz.vi 664 
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
665 
    db->cursor->len += len;
1327 mateusz.vi 666 
    uidirty.from = db->cursorposy;
667 
    uidirty.to = db->cursorposy;
1317 mateusz.vi 668 
    while (len--) {
669 
      db->cursor->payload[off++] = *databuf;
670 
      databuf++;
1327 mateusz.vi 671 
      cursor_right(db);
1317 mateusz.vi 672 
    }
673 
  }
674 
}
675 
 
676 
 
1286 mateusz.vi 677 
int main(void) {
678 
  const char *fname;
1320 mateusz.vi 679 
  struct file *db;
1275 mateusz.vi 680 
 
1307 mateusz.vi 681 
  {
682 
    char nlspath[128], lang[8];
683 
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
684 
  }
1282 mateusz.vi 685 
 
1286 mateusz.vi 686 
  fname = parseargv();
687 
 
688 
  if (fname == NULL) {
1302 mateusz.vi 689 
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
1275 mateusz.vi 690 
    return(0);
691 
  }
692 
 
1282 mateusz.vi 693 
  /* load file */
1320 mateusz.vi 694 
  db = loadfile(fname);
695 
  if (db == NULL) return(1);
1282 mateusz.vi 696 
 
1333 mateusz.vi 697 
  if (mdr_cout_init(&screenw, &screenh)) {
698 
    /* load color scheme if mdr_cout_init returns a color flag */
699 
    SCHEME_TEXT = 0x17;
700 
    SCHEME_STBAR1 = 0x70;
701 
    SCHEME_STBAR2 = 0x78;
702 
    SCHEME_STBAR3 = 0xf0;
703 
    SCHEME_SCROLL = 0x70;
704 
    SCHEME_MSG = 0xf0;
705 
    SCHEME_ERR = 0x4f;
706 
  }
1326 mateusz.vi 707 
  ui_basic(db);
1275 mateusz.vi 708 
 
709 
  for (;;) {
710 
    int k;
711 
 
1327 mateusz.vi 712 
    check_cursor_not_after_eol(db);
1320 mateusz.vi 713 
    mdr_cout_locate(db->cursorposy, db->cursorposx);
1275 mateusz.vi 714 
 
1327 mateusz.vi 715 
    if (uidirty.from != 0xff) {
716 
      ui_refresh(db);
717 
      uidirty.from = 0xff;
1282 mateusz.vi 718 
    }
1328 mateusz.vi 719 
#ifdef DBG_LINENUM
720 
      {
721 
        char ddd[10];
722 
        db->curline += 1;
723 
        ddd[0] = '0' + db->curline / 100;
724 
        ddd[1] = '0' + (db->curline % 100) / 10;
725 
        ddd[2] = '0' + (db->curline % 10);
726 
        db->curline -= 1;
727 
        ddd[3] = '/';
728 
        ddd[4] = '0' + db->totlines / 100;
729 
        ddd[5] = '0' + (db->totlines % 100) / 10;
730 
        ddd[6] = '0' + (db->totlines % 10);
731 
        ddd[7] = 0;
1333 mateusz.vi 732 
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
1328 mateusz.vi 733 
      }
734 
#endif
1275 mateusz.vi 735 
 
736 
    k = keyb_getkey();
1282 mateusz.vi 737 
 
1275 mateusz.vi 738 
    if (k == 0x150) { /* down */
1327 mateusz.vi 739 
      cursor_down(db);
1275 mateusz.vi 740 
 
741 
    } else if (k == 0x148) { /* up */
1327 mateusz.vi 742 
      cursor_up(db);
1275 mateusz.vi 743 
 
744 
    } else if (k == 0x14D) { /* right */
1327 mateusz.vi 745 
      cursor_right(db);
1275 mateusz.vi 746 
 
747 
    } else if (k == 0x14B) { /* left */
1327 mateusz.vi 748 
      cursor_left(db);
1275 mateusz.vi 749 
 
1282 mateusz.vi 750 
    } else if (k == 0x149) { /* pgup */
1334 mateusz.vi 751 
      unsigned char dist = db->cursorposy + screenh - 1;
752 
      while ((dist != 0) && (db->cursor->prev != NULL)) {
753 
        db->cursor = db->cursor->prev;
754 
        dist--;
755 
      }
756 
      if (dist != 0) {
757 
        db->cursorposy = 0;
758 
        db->cursorposx = 0;
759 
      } else {
760 
        dist = db->cursorposy;
761 
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
762 
      }
763 
      uidirty.from = 0;
764 
      uidirty.to = 0xff;
1282 mateusz.vi 765 
 
766 
    } else if (k == 0x151) { /* pgdown */
1334 mateusz.vi 767 
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
768 
      while ((dist != 0) && (db->cursor->next != NULL)) {
769 
        db->cursor = db->cursor->next;
770 
        dist--;
771 
      }
772 
      if (dist != 0) {
773 
        db->cursorposy = screenh - 2;
774 
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
775 
        db->cursorposx = 0;
776 
      } else {
777 
        dist = screenh - 2 - db->cursorposy;
778 
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
779 
      }
780 
      uidirty.from = 0;
781 
      uidirty.to = 0xff;
1282 mateusz.vi 782 
 
783 
    } else if (k == 0x147) { /* home */
1327 mateusz.vi 784 
       cursor_home(db);
1282 mateusz.vi 785 
 
786 
    } else if (k == 0x14F) { /* end */
1327 mateusz.vi 787 
       cursor_eol(db);
1282 mateusz.vi 788 
 
1275 mateusz.vi 789 
    } else if (k == 0x1B) { /* ESC */
1331 mateusz.vi 790 
      if (db->modflag == 0) break;
791 
      /* if file has been modified then ask for confirmation */
1333 mateusz.vi 792 
      ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);
1331 mateusz.vi 793 
      if (keyb_getkey() == '\r') break;
1275 mateusz.vi 794 
 
1289 mateusz.vi 795 
    } else if (k == 0x0D) { /* ENTER */
1328 mateusz.vi 796 
      unsigned short off = db->xoffset + db->cursorposx;
1289 mateusz.vi 797 
      /* add a new line */
1328 mateusz.vi 798 
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
1330 mateusz.vi 799 
        db->modflag = 1;
1328 mateusz.vi 800 
        db->cursor = db->cursor->prev; /* back to original line */
801 
        db->curline -= 1;
1289 mateusz.vi 802 
        /* trim the line above */
1328 mateusz.vi 803 
        db->cursor->len = off;
1289 mateusz.vi 804 
        /* move cursor to the (new) line below */
1328 mateusz.vi 805 
        uidirty.from = db->cursorposy;
1327 mateusz.vi 806 
        uidirty.to = 0xff;
1328 mateusz.vi 807 
        cursor_down(db);
808 
        cursor_home(db);
1289 mateusz.vi 809 
      } else {
810 
        /* ERROR: OUT OF MEMORY */
811 
      }
812 
 
1292 mateusz.vi 813 
    } else if (k == 0x153) {  /* DEL */
1327 mateusz.vi 814 
      del(db);
1292 mateusz.vi 815 
 
1302 mateusz.vi 816 
    } else if (k == 0x008) { /* BKSPC */
1327 mateusz.vi 817 
      bkspc(db);
1302 mateusz.vi 818 
 
1308 mateusz.vi 819 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
1317 mateusz.vi 820 
      char c = k;
1327 mateusz.vi 821 
      insert_in_line(db, &c, 1);
1308 mateusz.vi 822 
 
1317 mateusz.vi 823 
    } else if (k == 0x009) { /* TAB */
824 
      const char *tab = "        ";
1327 mateusz.vi 825 
      insert_in_line(db, tab, 8);
1317 mateusz.vi 826 
 
1309 mateusz.vi 827 
    } else if (k == 0x13b) { /* F1 */
1326 mateusz.vi 828 
      ui_help();
1327 mateusz.vi 829 
      uidirty.from = 0;
830 
      uidirty.to = 0xff;
1309 mateusz.vi 831 
 
1332 mateusz.vi 832 
    } else if ((k == 0x13f) || (k == 0x140)) { /* F5 or F6 */
833 
      int saveres;
834 
 
835 
      if ((k == 0x140) || (db->fname[0] == 0)) { /* save as... */
836 
        char fname[25];
837 
        ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
838 
        if (*fname == 0) continue;
839 
        saveres = savefile(db, fname);
840 
        if (saveres == 0) memcpy(db->fname, fname, sizeof(fname));
841 
      } else {
842 
        saveres = savefile(db, NULL);
843 
      }
844 
 
845 
      if (saveres == 0) {
1330 mateusz.vi 846 
        db->modflag = 0;
1333 mateusz.vi 847 
        ui_msg(svarlang_str(0, 2), NULL, SCHEME_MSG);
1322 mateusz.vi 848 
        mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
849 
      } else {
1333 mateusz.vi 850 
        ui_msg(svarlang_str(0, 3), NULL, SCHEME_ERR);
1322 mateusz.vi 851 
        mdr_bios_tickswait(36); /* 2s */
852 
      }
1311 mateusz.vi 853 
 
1332 mateusz.vi 854 
      ui_basic(db);
855 
      ui_refresh(db);
856 
 
1314 mateusz.vi 857 
    } else if (k == 0x144) { /* F10 */
1330 mateusz.vi 858 
      db->modflag = 1;
1320 mateusz.vi 859 
      db->lfonly ^= 1;
1326 mateusz.vi 860 
      ui_basic(db);
1314 mateusz.vi 861 
 
1325 mateusz.vi 862 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
863 
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
864 
      for (;;) {
865 
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
866 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
1327 mateusz.vi 867 
        cursor_right(db);
1325 mateusz.vi 868 
      }
869 
      /* now skip to next non-space or end of file */
870 
      for (;;) {
1327 mateusz.vi 871 
        cursor_right(db);
1325 mateusz.vi 872 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
873 
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
874 
      }
875 
 
876 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
1327 mateusz.vi 877 
      cursor_left(db);
1325 mateusz.vi 878 
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
879 
      for (;;) {
880 
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
881 
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
1327 mateusz.vi 882 
        cursor_left(db);
1325 mateusz.vi 883 
      }
884 
      /* now skip to next space or start of file */
885 
      for (;;) {
1327 mateusz.vi 886 
        cursor_left(db);
1325 mateusz.vi 887 
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
1327 mateusz.vi 888 
          cursor_right(db);
1325 mateusz.vi 889 
          break;
890 
        }
891 
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
892 
      }
893 
 
1333 mateusz.vi 894 
#ifdef DBG_UNHKEYS
1282 mateusz.vi 895 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
896 
      char buff[4];
897 
      const char *HEX = "0123456789ABCDEF";
898 
      buff[0] = HEX[(k >> 8) & 15];
899 
      buff[1] = HEX[(k >> 4) & 15];
900 
      buff[2] = HEX[k & 15];
1333 mateusz.vi 901 
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
902 
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
1275 mateusz.vi 903 
      keyb_getkey();
904 
      break;
1333 mateusz.vi 905 
#endif
1275 mateusz.vi 906 
    }
907 
  }
908 
 
909 
  mdr_cout_close();
910 
 
1320 mateusz.vi 911 
  /* no need to free memory, DOS will do it for me */
1275 mateusz.vi 912 
 
913 
  return(0);
914 
}