WebSVN – SvarDOS – Diff – /sved/trunk/sved.c


/* Sved, the SvarDOS editor
 *
 * Copyright (C) 2023 Mateusz Viste
 *
 * Sved is released under the terms of the MIT license.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
 
#include <dos.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>   /* _fcalloc() */
 
#include "mdr\cout.h"
#include "mdr\dos.h"
#include "mdr\keyb.h"
 
#include "svarlang\svarlang.h"
 
#define COL_TXT        0
#define COL_STATUSBAR1 1
#define COL_STATUSBAR2 2
#define COL_SCROLLBAR  3
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};
 
#define SCROLL_CURSOR 0xB1
 
 
struct line {
  struct line far *prev;
  struct line far *next;
  unsigned short len;
  char payload[1];
};
 
struct linedb {
  struct line far *topscreen;
  struct line far *cursor;
  unsigned short xoffset;
};
 
 
/* returns non-zero on error */
static int line_add(struct linedb *db, const char far *line) {
  unsigned short slen;
  struct line far *l;
 
  /* slen = strlen(line) (but for far pointer) */
  for (slen = 0; line[slen] != 0; slen++);
 
  /* trim out CR/LF line endings */
  if ((slen >= 2) && (line[slen - 2] == '\r')) {
    slen -= 2;
  } else if ((slen >= 1) && (line[slen - 1] == '\n')) {
    slen--;
  }
 
  l = _fcalloc(1, sizeof(struct line) + slen + 1);
  if (l == NULL) return(-1);
 
  l->prev = db->cursor;
  if (db->cursor) {
    l->next = db->cursor->next;
    db->cursor->next = l;
    l->next->prev = l;
  }
  db->cursor = l;
  _fmemcpy(l->payload, line, slen);
  l->len = slen;
 
  return(0);
}
 
 
static void db_rewind(struct linedb *db) {
  if (db->cursor == NULL) return;
  while (db->cursor->prev) db->cursor = db->cursor->prev;
  db->topscreen = db->cursor;
}
 
 
static void load_colorscheme(void) {
  scheme[COL_TXT] = 0x17;
  scheme[COL_STATUSBAR1] = 0x70;
  scheme[COL_STATUSBAR2] = 0x78;
  scheme[COL_SCROLLBAR] = 0x70;
}
 
 
static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname) {
  unsigned char i;
  const char *s = svarlang_strid(0); /* HELP */
  unsigned char helpcol = screenw - (strlen(s) + 4);
 
  /* clear screen */
  mdr_cout_cls(scheme[COL_TXT]);
 
  /* status bar */
  for (i = 0; i < helpcol; i++) {
    mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);
    if (*fname != 0) fname++;
  }
  mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);
  mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);
 
  /* scroll bar */
  for (i = 0; i < (screenh - 1); i++) {
    mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);
  }
}
 
 
static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {
  unsigned char y = 0;
  unsigned char len;
  struct line far *l;
 
#ifdef DBG_REFRESH
  static char m = 'a';
  m++;
  if (m > 'z') m = 'a';
#endif
 
  for (l = db->topscreen; l != NULL; l = l->next, y++) {
 
    /* skip lines that do not to be refreshed */
    if (y < uidirtyfrom) continue;
    if (y > uidirtyto) break;
 
    if (db->xoffset < l->len) {
      for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);
    } else {
      len = 0;
    }
    while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);
 
#ifdef DBG_REFRESH
    mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);
#endif
 
    if (y == screenh - 2) break;
  }
}
 
 
static void check_cursor_not_after_eol(struct linedb *db, unsigned char *cursorpos, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->xoffset + *cursorpos <= db->cursor->len) return;
 
  if (db->cursor->len < db->xoffset) {
    *cursorpos = 0;
    db->xoffset = db->cursor->len;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  } else {
    *cursorpos = db->cursor->len - db->xoffset;
  }
}
 
 
static void cursor_up(struct linedb *db, unsigned char *cursorposy, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->prev != NULL) {
    db->cursor = db->cursor->prev;
    if (*cursorposy == 0) {
      db->topscreen = db->cursor;
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    } else {
      *cursorposy -= 1;
    }
  }
}
 
 
static void cursor_eol(struct linedb *db, unsigned char *cursorposx, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  /* adjust xoffset to make sure eol is visible on screen */
  if (db->xoffset > db->cursor->len) {
    db->xoffset = db->cursor->len - 1;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  }
 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
    db->xoffset = db->cursor->len - screenw + 2;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  }
  *cursorposx = db->cursor->len - db->xoffset;
}
 
 
static void cursor_down(struct linedb *db, unsigned char *cursorposy, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->next != NULL) {
    db->cursor = db->cursor->next;
    if (*cursorposy < screenh - 2) {
      *cursorposy += 1;
    } else {
      db->topscreen = db->topscreen->next;
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    }
  }
}
 
 
static void cursor_left(struct linedb *db, unsigned char *cursorposx, unsigned char *cursorposy, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (*cursorposx > 0) {
    *cursorposx -= 1;
  } else if (db->xoffset > 0) {
    db->xoffset -= 1;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
    cursor_up(db, cursorposy, uidirtyfrom, uidirtyto);
    cursor_eol(db, cursorposx, screenw, uidirtyfrom, uidirtyto);
  }
}
 
 
static void cursor_home(struct linedb *db, unsigned char *cursorposx, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  *cursorposx = 0;
  if (db->xoffset != 0) {
    db->xoffset = 0;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  }
}
 
 
static void cursor_right(struct linedb *db, unsigned char *cursorposx, unsigned char *cursorposy, unsigned char screenw, unsigned char screenh, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->len > db->xoffset + *cursorposx) {
    if (*cursorposx < screenw - 2) {
      *cursorposx += 1;
    } else {
      db->xoffset += 1;
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    }
  } else {
    cursor_down(db, cursorposy, screenh, uidirtyfrom, uidirtyto);
    cursor_home(db, cursorposx, uidirtyfrom, uidirtyto);
  }
}
 
 
static void del(struct linedb *db, unsigned char cursorposx, unsigned char cursorposy, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (cursorposx + db->xoffset < db->cursor->len) {
    _fmemmove(db->cursor->payload + cursorposx + db->xoffset, db->cursor->payload + cursorposx + db->xoffset + 1, db->cursor->len - cursorposx - db->xoffset);
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
    *uidirtyfrom = cursorposy;
    *uidirtyto = cursorposy;
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
    struct line far *nextline = db->cursor->next;
    if (db->cursor->next->len > 0) {
      void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);
      if (newptr != NULL) {
        db->cursor = newptr;
        _fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
        db->cursor->len += db->cursor->next->len;
        /* update db->topscreen if needed */
        if (cursorposy == 0) db->topscreen = db->cursor;
      }
    }
    db->cursor->next = db->cursor->next->next;
    db->cursor->next->prev = db->cursor;
    if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
    _ffree(nextline);
    *uidirtyfrom = cursorposy;
    *uidirtyto = 0xff;
  }
}
 
 
static void bkspc(struct linedb *db, unsigned char *cursorposx, unsigned char *cursorposy, unsigned char screenw, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
  if ((*cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
 
  cursor_left(db, cursorposx, cursorposy, screenw, uidirtyfrom, uidirtyto);
  del(db, *cursorposx, *cursorposy, uidirtyfrom, uidirtyto);
}
 
 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
 * of argc and argv, saves some 330 bytes of binary size */
static char *parseargv(void) {
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
  unsigned char count = 0;
  char *argv[4];
 
  while (count < 4) {
    /* jump to nearest arg */
    while (*tail == ' ') {
      *tail = 0;
      tail++;
    }
 
    if (*tail == '\r') {
      *tail = 0;
      break;
    }
 
    argv[count++] = tail;
 
    /* jump to next delimiter */
    while ((*tail != ' ') && (*tail != '\r')) tail++;
  }
 
  /* check args now */
  if (count != 1) return(NULL);
 
  return(argv[0]);
}
 
 
static int loadfile(struct linedb *db, const char *fname) {
  char buff[1024];
  unsigned int prevlen = 0, len, llen;
  int fd;
  int r = 0;
 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
    mdr_coutraw_puts("Failed to open file:");
    mdr_coutraw_puts(fname);
    return(-1);
  }
 
  do {
    if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {
      len += prevlen;
    } else {
      len = prevlen;
    }
 
    /* look for nearest \n and replace with 0*/
    for (llen = 0; buff[llen] != '\n'; llen++) {
      if (llen == sizeof(buff)) break;
    }
    buff[llen] = 0;
    if ((llen > 0) && (buff[llen - 1])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */
    if (line_add(db, buff) != 0) {
      mdr_coutraw_puts("out of memory");
      r = -1;
      break;
    }
 
    len -= llen + 1;
    memmove(buff, buff + llen + 1, len);
    prevlen = len;
  } while (len > 0);
 
  _dos_close(fd);
 
  return(r);
}
 
 
int main(void) {
  const char *fname;
  struct linedb db;
  unsigned char screenw = 0, screenh = 0;
  unsigned char cursorposx = 0, cursorposy = 0;
  unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */
 
  bzero(&db, sizeof(db));
 
  {
    char nlspath[128], lang[8];
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
  }
 
  fname = parseargv();
 
  if (fname == NULL) {
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
    return(0);
  }
 
  /* load file */
  if (loadfile(&db, fname) != 0) return(1);
 
  /* add an empty line at end if not present already */
  if (db.cursor->len != 0) line_add(&db, "");
 
  if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();
  ui_basic(screenw, screenh, fname);
 
  db_rewind(&db);
 
  for (;;) {
    int k;
 
    check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);
    mdr_cout_locate(cursorposy, cursorposx);
 
    if (uidirtyfrom != 0xff) {
      ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto);
      uidirtyfrom = 0xff;
    }
 
    k = keyb_getkey();
 
    if (k == 0x150) { /* down */
      cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x148) { /* up */
      cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14D) { /* right */
 
 
 
 
 
 
 
 
 
      cursor_right(&db, &cursorposx, &cursorposy, screenw, screenh, &uidirtyfrom, &uidirtyto);
 
 
 
    } else if (k == 0x14B) { /* left */
      cursor_left(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x149) { /* pgup */
      // TODO
 
    } else if (k == 0x151) { /* pgdown */
      // TODO
 
    } else if (k == 0x147) { /* home */
       cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14F) { /* end */
       cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x1B) { /* ESC */
      break;
 
    } else if (k == 0x0D) { /* ENTER */
      /* add a new line */
      if (line_add(&db, db.cursor->payload + db.xoffset + cursorposx) == 0) {
        /* trim the line above */
        db.cursor->prev->len = db.xoffset + cursorposx;
        db.cursor->prev->payload[db.cursor->prev->len] = 0;
        /* move cursor to the (new) line below */
        cursorposx = 0;
        if (cursorposy < screenh - 2) {
          uidirtyfrom = cursorposy;
          cursorposy++;
        } else {
          db.topscreen = db.topscreen->next;
          uidirtyfrom = 0;
        }
        uidirtyto = 0xff;
      } else {
        /* ERROR: OUT OF MEMORY */
      }
 
    } else if (k == 0x153) {  /* DEL */
      del(&db, cursorposx, cursorposy, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x008) { /* BKSPC */
      bkspc(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);
 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
      struct line far *n;
      n = _frealloc(db.cursor, sizeof(struct line) + db.cursor->len);
      if (n != NULL) {
        unsigned short off = db.xoffset + cursorposx;
        if (n->prev) n->prev->next = n;
        if (n->next) n->next->prev = n;
        if (db.topscreen == db.cursor) db.topscreen = n;
        db.cursor = n;
        _fmemmove(db.cursor->payload + off + 1, db.cursor->payload + off, db.cursor->len - off + 1);
        db.cursor->len += 1;
        uidirtyfrom = cursorposy;
        uidirtyto = cursorposy;
        db.cursor->payload[off] = k;
        cursor_right(&db, &cursorposx, &cursorposy, screenw, screenh, &uidirtyfrom, &uidirtyto);
      }
 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
      char buff[4];
      const char *HEX = "0123456789ABCDEF";
      buff[0] = HEX[(k >> 8) & 15];
      buff[1] = HEX[(k >> 4) & 15];
      buff[2] = HEX[k & 15];
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", scheme[COL_STATUSBAR1], 17);
      mdr_cout_str(screenh - 1, 17, buff, scheme[COL_STATUSBAR1], 3);
      keyb_getkey();
      break;
    }
  }
 
  mdr_cout_close();
 
  /* TODO free memory */
 
  return(0);
}
 

Rev 1307	Rev 1308
1	`/* Sved, the SvarDOS editor`	1	`/* Sved, the SvarDOS editor`
2	`*`	2	`*`
3	`* Copyright (C) 2023 Mateusz Viste`	3	`* Copyright (C) 2023 Mateusz Viste`
4	`*`	4	`*`
5	`* Sved is released under the terms of the MIT license.`	5	`* Sved is released under the terms of the MIT license.`
6	`*`	6	`*`
7	`* Permission is hereby granted, free of charge, to any person obtaining a copy`	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`	8	`* of this software and associated documentation files (the "Software"), to`
9	`* deal in the Software without restriction, including without limitation the`	9	`* deal in the Software without restriction, including without limitation the`
10	`* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or`	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`	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:`	12	`* furnished to do so, subject to the following conditions:`
13	`*`	13	`*`
14	`* The above copyright notice and this permission notice shall be included in`	14	`* The above copyright notice and this permission notice shall be included in`
15	`* all copies or substantial portions of the Software.`	15	`* all copies or substantial portions of the Software.`
16	`*`	16	`*`
17	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`	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,`	18	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`
19	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`	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`	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`	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`	22	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS`
23	`* IN THE SOFTWARE.`	23	`* IN THE SOFTWARE.`
24	`*/`	24	`*/`
25		25
26	`#include <dos.h>`	26	`#include <dos.h>`
27	`#include <fcntl.h>`	27	`#include <fcntl.h>`
28	`#include <stdlib.h>`	28	`#include <stdlib.h>`
29	`#include <string.h>`	29	`#include <string.h>`
30	`#include <malloc.h> /* _fcalloc() */`	30	`#include <malloc.h> /* _fcalloc() */`
31		31
32	`#include "mdr\cout.h"`	32	`#include "mdr\cout.h"`
33	`#include "mdr\dos.h"`	33	`#include "mdr\dos.h"`
34	`#include "mdr\keyb.h"`	34	`#include "mdr\keyb.h"`
35		35
36	`#include "svarlang\svarlang.h"`	36	`#include "svarlang\svarlang.h"`
37		37
38	`#define COL_TXT 0`	38	`#define COL_TXT 0`
39	`#define COL_STATUSBAR1 1`	39	`#define COL_STATUSBAR1 1`
40	`#define COL_STATUSBAR2 2`	40	`#define COL_STATUSBAR2 2`
41	`#define COL_SCROLLBAR 3`	41	`#define COL_SCROLLBAR 3`
42	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`	42	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`
43	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};`	43	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};`
44		44
45	`#define SCROLL_CURSOR 0xB1`	45	`#define SCROLL_CURSOR 0xB1`
46		46
47		47
48	`struct line {`	48	`struct line {`
49	`struct line far *prev;`	49	`struct line far *prev;`
50	`struct line far *next;`	50	`struct line far *next;`
51	`unsigned short len;`	51	`unsigned short len;`
52	`char payload[1];`	52	`char payload[1];`
53	`};`	53	`};`
54		54
55	`struct linedb {`	55	`struct linedb {`
56	`struct line far *topscreen;`	56	`struct line far *topscreen;`
57	`struct line far *cursor;`	57	`struct line far *cursor;`
58	`unsigned short xoffset;`	58	`unsigned short xoffset;`
59	`};`	59	`};`
60		60
61		61
62	`/* returns non-zero on error */`	62	`/* returns non-zero on error */`
63	`static int line_add(struct linedb db, const char far line) {`	63	`static int line_add(struct linedb db, const char far line) {`
64	`unsigned short slen;`	64	`unsigned short slen;`
65	`struct line far *l;`	65	`struct line far *l;`
66		66
67	`/* slen = strlen(line) (but for far pointer) */`	67	`/* slen = strlen(line) (but for far pointer) */`
68	`for (slen = 0; line[slen] != 0; slen++);`	68	`for (slen = 0; line[slen] != 0; slen++);`
69		69
70	`/* trim out CR/LF line endings */`	70	`/* trim out CR/LF line endings */`
71	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`	71	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`
72	`slen -= 2;`	72	`slen -= 2;`
73	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`	73	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`
74	`slen--;`	74	`slen--;`
75	`}`	75	`}`
76		76
77	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`	77	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`
78	`if (l == NULL) return(-1);`	78	`if (l == NULL) return(-1);`
79		79
80	`l->prev = db->cursor;`	80	`l->prev = db->cursor;`
81	`if (db->cursor) {`	81	`if (db->cursor) {`
82	`l->next = db->cursor->next;`	82	`l->next = db->cursor->next;`
83	`db->cursor->next = l;`	83	`db->cursor->next = l;`
84	`l->next->prev = l;`	84	`l->next->prev = l;`
85	`}`	85	`}`
86	`db->cursor = l;`	86	`db->cursor = l;`
87	`_fmemcpy(l->payload, line, slen);`	87	`_fmemcpy(l->payload, line, slen);`
88	`l->len = slen;`	88	`l->len = slen;`
89		89
90	`return(0);`	90	`return(0);`
91	`}`	91	`}`
92		92
93		93
94	`static void db_rewind(struct linedb *db) {`	94	`static void db_rewind(struct linedb *db) {`
95	`if (db->cursor == NULL) return;`	95	`if (db->cursor == NULL) return;`
96	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	96	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
97	`db->topscreen = db->cursor;`	97	`db->topscreen = db->cursor;`
98	`}`	98	`}`
99		99
100		100
101	`static void load_colorscheme(void) {`	101	`static void load_colorscheme(void) {`
102	`scheme[COL_TXT] = 0x17;`	102	`scheme[COL_TXT] = 0x17;`
103	`scheme[COL_STATUSBAR1] = 0x70;`	103	`scheme[COL_STATUSBAR1] = 0x70;`
104	`scheme[COL_STATUSBAR2] = 0x78;`	104	`scheme[COL_STATUSBAR2] = 0x78;`
105	`scheme[COL_SCROLLBAR] = 0x70;`	105	`scheme[COL_SCROLLBAR] = 0x70;`
106	`}`	106	`}`
107		107
108		108
109	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname) {`	109	`static void ui_basic(unsigned char screenw, unsigned char screenh, const char *fname) {`
110	`unsigned char i;`	110	`unsigned char i;`
111	`const char s = svarlang_strid(0); / HELP */`	111	`const char s = svarlang_strid(0); / HELP */`
112	`unsigned char helpcol = screenw - (strlen(s) + 4);`	112	`unsigned char helpcol = screenw - (strlen(s) + 4);`
113		113
114	`/* clear screen */`	114	`/* clear screen */`
115	`mdr_cout_cls(scheme[COL_TXT]);`	115	`mdr_cout_cls(scheme[COL_TXT]);`
116		116
117	`/* status bar */`	117	`/* status bar */`
118	`for (i = 0; i < helpcol; i++) {`	118	`for (i = 0; i < helpcol; i++) {`
119	`mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);`	119	`mdr_cout_char(screenh - 1, i, *fname, scheme[COL_STATUSBAR1]);`
120	`if (*fname != 0) fname++;`	120	`if (*fname != 0) fname++;`
121	`}`	121	`}`
122	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	122	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
123	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`	123	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`
124		124
125	`/* scroll bar */`	125	`/* scroll bar */`
126	`for (i = 0; i < (screenh - 1); i++) {`	126	`for (i = 0; i < (screenh - 1); i++) {`
127	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	127	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
128	`}`	128	`}`
129	`}`	129	`}`
130		130
131		131
132	`static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	132	`static void ui_refresh(const struct linedb *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
133	`unsigned char y = 0;`	133	`unsigned char y = 0;`
134	`unsigned char len;`	134	`unsigned char len;`
135	`struct line far *l;`	135	`struct line far *l;`
136		136
137	`#ifdef DBG_REFRESH`	137	`#ifdef DBG_REFRESH`
138	`static char m = 'a';`	138	`static char m = 'a';`
139	`m++;`	139	`m++;`
140	`if (m > 'z') m = 'a';`	140	`if (m > 'z') m = 'a';`
141	`#endif`	141	`#endif`
142		142
143	`for (l = db->topscreen; l != NULL; l = l->next, y++) {`	143	`for (l = db->topscreen; l != NULL; l = l->next, y++) {`
144		144
145	`/* skip lines that do not to be refreshed */`	145	`/* skip lines that do not to be refreshed */`
146	`if (y < uidirtyfrom) continue;`	146	`if (y < uidirtyfrom) continue;`
147	`if (y > uidirtyto) break;`	147	`if (y > uidirtyto) break;`
148		148
149	`if (db->xoffset < l->len) {`	149	`if (db->xoffset < l->len) {`
150	`for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);`	150	`for (len = 0; l->payload[len] != 0; len++) mdr_cout_char(y, len, l->payload[len], scheme[COL_TXT]);`
151	`} else {`	151	`} else {`
152	`len = 0;`	152	`len = 0;`
153	`}`	153	`}`
154	`while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);`	154	`while (len < screenw - 1) mdr_cout_char(y, len++, ' ', scheme[COL_TXT]);`
155		155
156	`#ifdef DBG_REFRESH`	156	`#ifdef DBG_REFRESH`
157	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	157	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
158	`#endif`	158	`#endif`
159		159
160	`if (y == screenh - 2) break;`	160	`if (y == screenh - 2) break;`
161	`}`	161	`}`
162	`}`	162	`}`
163		163
164		164
165	`static void check_cursor_not_after_eol(struct linedb db, unsigned char cursorpos, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	165	`static void check_cursor_not_after_eol(struct linedb db, unsigned char cursorpos, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
166	`if (db->xoffset + *cursorpos <= db->cursor->len) return;`	166	`if (db->xoffset + *cursorpos <= db->cursor->len) return;`
167		167
168	`if (db->cursor->len < db->xoffset) {`	168	`if (db->cursor->len < db->xoffset) {`
169	`*cursorpos = 0;`	169	`*cursorpos = 0;`
170	`db->xoffset = db->cursor->len;`	170	`db->xoffset = db->cursor->len;`
171	`*uidirtyfrom = 0;`	171	`*uidirtyfrom = 0;`
172	`*uidirtyto = 0xff;`	172	`*uidirtyto = 0xff;`
173	`} else {`	173	`} else {`
174	`*cursorpos = db->cursor->len - db->xoffset;`	174	`*cursorpos = db->cursor->len - db->xoffset;`
175	`}`	175	`}`
176	`}`	176	`}`
177		177
178		178
179	`static void cursor_up(struct linedb db, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	179	`static void cursor_up(struct linedb db, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
180	`if (db->cursor->prev != NULL) {`	180	`if (db->cursor->prev != NULL) {`
181	`db->cursor = db->cursor->prev;`	181	`db->cursor = db->cursor->prev;`
182	`if (*cursorposy == 0) {`	182	`if (*cursorposy == 0) {`
183	`db->topscreen = db->cursor;`	183	`db->topscreen = db->cursor;`
184	`*uidirtyfrom = 0;`	184	`*uidirtyfrom = 0;`
185	`*uidirtyto = 0xff;`	185	`*uidirtyto = 0xff;`
186	`} else {`	186	`} else {`
187	`*cursorposy -= 1;`	187	`*cursorposy -= 1;`
188	`}`	188	`}`
189	`}`	189	`}`
190	`}`	190	`}`
191		191
192		192
193	`static void cursor_eol(struct linedb db, unsigned char cursorposx, unsigned char screenw, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	193	`static void cursor_eol(struct linedb db, unsigned char cursorposx, unsigned char screenw, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
194	`/* adjust xoffset to make sure eol is visible on screen */`	194	`/* adjust xoffset to make sure eol is visible on screen */`
195	`if (db->xoffset > db->cursor->len) {`	195	`if (db->xoffset > db->cursor->len) {`
196	`db->xoffset = db->cursor->len - 1;`	196	`db->xoffset = db->cursor->len - 1;`
197	`*uidirtyfrom = 0;`	197	`*uidirtyfrom = 0;`
198	`*uidirtyto = 0xff;`	198	`*uidirtyto = 0xff;`
199	`}`	199	`}`
200		200
201	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	201	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
202	`db->xoffset = db->cursor->len - screenw + 2;`	202	`db->xoffset = db->cursor->len - screenw + 2;`
203	`*uidirtyfrom = 0;`	203	`*uidirtyfrom = 0;`
204	`*uidirtyto = 0xff;`	204	`*uidirtyto = 0xff;`
205	`}`	205	`}`
206	`*cursorposx = db->cursor->len - db->xoffset;`	206	`*cursorposx = db->cursor->len - db->xoffset;`
207	`}`	207	`}`
208		208
209		209
210	`static void cursor_down(struct linedb db, unsigned char cursorposy, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	210	`static void cursor_down(struct linedb db, unsigned char cursorposy, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
211	`if (db->cursor->next != NULL) {`	211	`if (db->cursor->next != NULL) {`
212	`db->cursor = db->cursor->next;`	212	`db->cursor = db->cursor->next;`
213	`if (*cursorposy < screenh - 2) {`	213	`if (*cursorposy < screenh - 2) {`
214	`*cursorposy += 1;`	214	`*cursorposy += 1;`
215	`} else {`	215	`} else {`
216	`db->topscreen = db->topscreen->next;`	216	`db->topscreen = db->topscreen->next;`
217	`*uidirtyfrom = 0;`	217	`*uidirtyfrom = 0;`
218	`*uidirtyto = 0xff;`	218	`*uidirtyto = 0xff;`
219	`}`	219	`}`
220	`}`	220	`}`
221	`}`	221	`}`
222		222
223		223
224	`static void cursor_left(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	224	`static void cursor_left(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
225	`if (*cursorposx > 0) {`	225	`if (*cursorposx > 0) {`
226	`*cursorposx -= 1;`	226	`*cursorposx -= 1;`
227	`} else if (db->xoffset > 0) {`	227	`} else if (db->xoffset > 0) {`
228	`db->xoffset -= 1;`	228	`db->xoffset -= 1;`
229	`*uidirtyfrom = 0;`	229	`*uidirtyfrom = 0;`
230	`*uidirtyto = 0xff;`	230	`*uidirtyto = 0xff;`
231	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	231	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
232	`cursor_up(db, cursorposy, uidirtyfrom, uidirtyto);`	232	`cursor_up(db, cursorposy, uidirtyfrom, uidirtyto);`
233	`cursor_eol(db, cursorposx, screenw, uidirtyfrom, uidirtyto);`	233	`cursor_eol(db, cursorposx, screenw, uidirtyfrom, uidirtyto);`
234	`}`	234	`}`
235	`}`	235	`}`
236		236
237		237
238	`static void cursor_home(struct linedb db, unsigned char cursorposx, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	238	`static void cursor_home(struct linedb db, unsigned char cursorposx, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
239	`*cursorposx = 0;`	239	`*cursorposx = 0;`
240	`if (db->xoffset != 0) {`	240	`if (db->xoffset != 0) {`
241	`db->xoffset = 0;`	241	`db->xoffset = 0;`
242	`*uidirtyfrom = 0;`	242	`*uidirtyfrom = 0;`
243	`*uidirtyto = 0xff;`	243	`*uidirtyto = 0xff;`
244	`}`	244	`}`
245	`}`	245	`}`
246		246
247		247
-		248	`static void cursor_right(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
-		249	`if (db->cursor->len > db->xoffset + *cursorposx) {`
-		250	`if (*cursorposx < screenw - 2) {`
-		251	`*cursorposx += 1;`
-		252	`} else {`
-		253	`db->xoffset += 1;`
-		254	`*uidirtyfrom = 0;`
-		255	`*uidirtyto = 0xff;`
-		256	`}`
-		257	`} else {`
-		258	`cursor_down(db, cursorposy, screenh, uidirtyfrom, uidirtyto);`
-		259	`cursor_home(db, cursorposx, uidirtyfrom, uidirtyto);`
-		260	`}`
-		261	`}`
-		262
-		263
248	`static void del(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	264	`static void del(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
249	`if (cursorposx + db->xoffset < db->cursor->len) {`	265	`if (cursorposx + db->xoffset < db->cursor->len) {`
250	`_fmemmove(db->cursor->payload + cursorposx + db->xoffset, db->cursor->payload + cursorposx + db->xoffset + 1, db->cursor->len - cursorposx - db->xoffset);`	266	`_fmemmove(db->cursor->payload + cursorposx + db->xoffset, db->cursor->payload + cursorposx + db->xoffset + 1, db->cursor->len - cursorposx - db->xoffset);`
251	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	267	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
252	`*uidirtyfrom = cursorposy;`	268	`*uidirtyfrom = cursorposy;`
253	`*uidirtyto = cursorposy;`	269	`*uidirtyto = cursorposy;`
254	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	270	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`
255	`struct line far *nextline = db->cursor->next;`	271	`struct line far *nextline = db->cursor->next;`
256	`if (db->cursor->next->len > 0) {`	272	`if (db->cursor->next->len > 0) {`
257	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	273	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
258	`if (newptr != NULL) {`	274	`if (newptr != NULL) {`
259	`db->cursor = newptr;`	275	`db->cursor = newptr;`
260	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	276	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
261	`db->cursor->len += db->cursor->next->len;`	277	`db->cursor->len += db->cursor->next->len;`
262	`/* update db->topscreen if needed */`	278	`/* update db->topscreen if needed */`
263	`if (cursorposy == 0) db->topscreen = db->cursor;`	279	`if (cursorposy == 0) db->topscreen = db->cursor;`
264	`}`	280	`}`
265	`}`	281	`}`
266	`db->cursor->next = db->cursor->next->next;`	282	`db->cursor->next = db->cursor->next->next;`
267	`db->cursor->next->prev = db->cursor;`	283	`db->cursor->next->prev = db->cursor;`
268	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	284	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
269	`_ffree(nextline);`	285	`_ffree(nextline);`
270	`*uidirtyfrom = cursorposy;`	286	`*uidirtyfrom = cursorposy;`
271	`*uidirtyto = 0xff;`	287	`*uidirtyto = 0xff;`
272	`}`	288	`}`
273	`}`	289	`}`
274		290
275		291
276	`static void bkspc(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	292	`static void bkspc(struct linedb db, unsigned char cursorposx, unsigned char cursorposy, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
277		293
278	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	294	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
279	`if ((*cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	295	`if ((*cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
280		296
281	`cursor_left(db, cursorposx, cursorposy, screenw, uidirtyfrom, uidirtyto);`	297	`cursor_left(db, cursorposx, cursorposy, screenw, uidirtyfrom, uidirtyto);`
282	`del(db, cursorposx, cursorposy, uidirtyfrom, uidirtyto);`	298	`del(db, cursorposx, cursorposy, uidirtyfrom, uidirtyto);`
283	`}`	299	`}`
284		300
285		301
286	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	302	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
287	`* of argc and argv, saves some 330 bytes of binary size */`	303	`* of argc and argv, saves some 330 bytes of binary size */`
288	`static char *parseargv(void) {`	304	`static char *parseargv(void) {`
289	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	305	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
290	`unsigned char count = 0;`	306	`unsigned char count = 0;`
291	`char *argv[4];`	307	`char *argv[4];`
292		308
293	`while (count < 4) {`	309	`while (count < 4) {`
294	`/* jump to nearest arg */`	310	`/* jump to nearest arg */`
295	`while (*tail == ' ') {`	311	`while (*tail == ' ') {`
296	`*tail = 0;`	312	`*tail = 0;`
297	`tail++;`	313	`tail++;`
298	`}`	314	`}`
299		315
300	`if (*tail == '\r') {`	316	`if (*tail == '\r') {`
301	`*tail = 0;`	317	`*tail = 0;`
302	`break;`	318	`break;`
303	`}`	319	`}`
304		320
305	`argv[count++] = tail;`	321	`argv[count++] = tail;`
306		322
307	`/* jump to next delimiter */`	323	`/* jump to next delimiter */`
308	`while ((tail != ' ') && (tail != '\r')) tail++;`	324	`while ((tail != ' ') && (tail != '\r')) tail++;`
309	`}`	325	`}`
310		326
311	`/* check args now */`	327	`/* check args now */`
312	`if (count != 1) return(NULL);`	328	`if (count != 1) return(NULL);`
313		329
314	`return(argv[0]);`	330	`return(argv[0]);`
315	`}`	331	`}`
316		332
317		333
318	`static int loadfile(struct linedb db, const char fname) {`	334	`static int loadfile(struct linedb db, const char fname) {`
319	`char buff[1024];`	335	`char buff[1024];`
320	`unsigned int prevlen = 0, len, llen;`	336	`unsigned int prevlen = 0, len, llen;`
321	`int fd;`	337	`int fd;`
322	`int r = 0;`	338	`int r = 0;`
323		339
324	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	340	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
325	`mdr_coutraw_puts("Failed to open file:");`	341	`mdr_coutraw_puts("Failed to open file:");`
326	`mdr_coutraw_puts(fname);`	342	`mdr_coutraw_puts(fname);`
327	`return(-1);`	343	`return(-1);`
328	`}`	344	`}`
329		345
330	`do {`	346	`do {`
331	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`	347	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`
332	`len += prevlen;`	348	`len += prevlen;`
333	`} else {`	349	`} else {`
334	`len = prevlen;`	350	`len = prevlen;`
335	`}`	351	`}`
336		352
337	`/* look for nearest \n and replace with 0*/`	353	`/* look for nearest \n and replace with 0*/`
338	`for (llen = 0; buff[llen] != '\n'; llen++) {`	354	`for (llen = 0; buff[llen] != '\n'; llen++) {`
339	`if (llen == sizeof(buff)) break;`	355	`if (llen == sizeof(buff)) break;`
340	`}`	356	`}`
341	`buff[llen] = 0;`	357	`buff[llen] = 0;`
342	`if ((llen > 0) && (buff[llen - 1])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`	358	`if ((llen > 0) && (buff[llen - 1])) buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`
343	`if (line_add(db, buff) != 0) {`	359	`if (line_add(db, buff) != 0) {`
344	`mdr_coutraw_puts("out of memory");`	360	`mdr_coutraw_puts("out of memory");`
345	`r = -1;`	361	`r = -1;`
346	`break;`	362	`break;`
347	`}`	363	`}`
348		364
349	`len -= llen + 1;`	365	`len -= llen + 1;`
350	`memmove(buff, buff + llen + 1, len);`	366	`memmove(buff, buff + llen + 1, len);`
351	`prevlen = len;`	367	`prevlen = len;`
352	`} while (len > 0);`	368	`} while (len > 0);`
353		369
354	`_dos_close(fd);`	370	`_dos_close(fd);`
355		371
356	`return(r);`	372	`return(r);`
357	`}`	373	`}`
358		374
359		375
360	`int main(void) {`	376	`int main(void) {`
361	`const char *fname;`	377	`const char *fname;`
362	`struct linedb db;`	378	`struct linedb db;`
363	`unsigned char screenw = 0, screenh = 0;`	379	`unsigned char screenw = 0, screenh = 0;`
364	`unsigned char cursorposx = 0, cursorposy = 0;`	380	`unsigned char cursorposx = 0, cursorposy = 0;`
365	`unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */`	381	`unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */`
366		382
367	`bzero(&db, sizeof(db));`	383	`bzero(&db, sizeof(db));`
368		384
369	`{`	385	`{`
370	`char nlspath[128], lang[8];`	386	`char nlspath[128], lang[8];`
371	`svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));`	387	`svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));`
372	`}`	388	`}`
373		389
374	`fname = parseargv();`	390	`fname = parseargv();`
375		391
376	`if (fname == NULL) {`	392	`if (fname == NULL) {`
377	`mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */`	393	`mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */`
378	`return(0);`	394	`return(0);`
379	`}`	395	`}`
380		396
381	`/* load file */`	397	`/* load file */`
382	`if (loadfile(&db, fname) != 0) return(1);`	398	`if (loadfile(&db, fname) != 0) return(1);`
383		399
384	`/* add an empty line at end if not present already */`	400	`/* add an empty line at end if not present already */`
385	`if (db.cursor->len != 0) line_add(&db, "");`	401	`if (db.cursor->len != 0) line_add(&db, "");`
386		402
387	`if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();`	403	`if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();`
388	`ui_basic(screenw, screenh, fname);`	404	`ui_basic(screenw, screenh, fname);`
389		405
390	`db_rewind(&db);`	406	`db_rewind(&db);`
391		407
392	`for (;;) {`	408	`for (;;) {`
393	`int k;`	409	`int k;`
394		410
395	`check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`	411	`check_cursor_not_after_eol(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`
396	`mdr_cout_locate(cursorposy, cursorposx);`	412	`mdr_cout_locate(cursorposy, cursorposx);`
397		413
398	`if (uidirtyfrom != 0xff) {`	414	`if (uidirtyfrom != 0xff) {`
399	`ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto);`	415	`ui_refresh(&db, screenw, screenh, uidirtyfrom, uidirtyto);`
400	`uidirtyfrom = 0xff;`	416	`uidirtyfrom = 0xff;`
401	`}`	417	`}`
402		418
403	`k = keyb_getkey();`	419	`k = keyb_getkey();`
404		420
405	`if (k == 0x150) { /* down */`	421	`if (k == 0x150) { /* down */`
406	`cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);`	422	`cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);`
407		423
408	`} else if (k == 0x148) { /* up */`	424	`} else if (k == 0x148) { /* up */`
409	`cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);`	425	`cursor_up(&db, &cursorposy, &uidirtyfrom, &uidirtyto);`
410		426
411	`} else if (k == 0x14D) { /* right */`	427	`} else if (k == 0x14D) { /* right */`
412	`if (db.cursor->len > db.xoffset + cursorposx) {`	-
413	`if (cursorposx < screenw - 2) {`	-
414	`cursorposx++;`	-
415	`} else {`	-
416	`db.xoffset++;`	-
417	`uidirtyfrom = 0;`	-
418	`uidirtyto = 0xff;`	-
419	`}`	-
420	`} else {`	-
421	`cursor_down(&db, &cursorposy, screenh, &uidirtyfrom, &uidirtyto);`	428	`cursor_right(&db, &cursorposx, &cursorposy, screenw, screenh, &uidirtyfrom, &uidirtyto);`
422	`cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`	-
423	`}`	-
424		429
425	`} else if (k == 0x14B) { /* left */`	430	`} else if (k == 0x14B) { /* left */`
426	`cursor_left(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);`	431	`cursor_left(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);`
427		432
428	`} else if (k == 0x149) { /* pgup */`	433	`} else if (k == 0x149) { /* pgup */`
429	`// TODO`	434	`// TODO`
430		435
431	`} else if (k == 0x151) { /* pgdown */`	436	`} else if (k == 0x151) { /* pgdown */`
432	`// TODO`	437	`// TODO`
433		438
434	`} else if (k == 0x147) { /* home */`	439	`} else if (k == 0x147) { /* home */`
435	`cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`	440	`cursor_home(&db, &cursorposx, &uidirtyfrom, &uidirtyto);`
436		441
437	`} else if (k == 0x14F) { /* end */`	442	`} else if (k == 0x14F) { /* end */`
438	`cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);`	443	`cursor_eol(&db, &cursorposx, screenw, &uidirtyfrom, &uidirtyto);`
439		444
440	`} else if (k == 0x1B) { /* ESC */`	445	`} else if (k == 0x1B) { /* ESC */`
441	`break;`	446	`break;`
442		447
443	`} else if (k == 0x0D) { /* ENTER */`	448	`} else if (k == 0x0D) { /* ENTER */`
444	`/* add a new line */`	449	`/* add a new line */`
445	`if (line_add(&db, db.cursor->payload + db.xoffset + cursorposx) == 0) {`	450	`if (line_add(&db, db.cursor->payload + db.xoffset + cursorposx) == 0) {`
446	`/* trim the line above */`	451	`/* trim the line above */`
447	`db.cursor->prev->len = db.xoffset + cursorposx;`	452	`db.cursor->prev->len = db.xoffset + cursorposx;`
448	`db.cursor->prev->payload[db.cursor->prev->len] = 0;`	453	`db.cursor->prev->payload[db.cursor->prev->len] = 0;`
449	`/* move cursor to the (new) line below */`	454	`/* move cursor to the (new) line below */`
450	`cursorposx = 0;`	455	`cursorposx = 0;`
451	`if (cursorposy < screenh - 2) {`	456	`if (cursorposy < screenh - 2) {`
452	`uidirtyfrom = cursorposy;`	457	`uidirtyfrom = cursorposy;`
453	`cursorposy++;`	458	`cursorposy++;`
454	`} else {`	459	`} else {`
455	`db.topscreen = db.topscreen->next;`	460	`db.topscreen = db.topscreen->next;`
456	`uidirtyfrom = 0;`	461	`uidirtyfrom = 0;`
457	`}`	462	`}`
458	`uidirtyto = 0xff;`	463	`uidirtyto = 0xff;`
459	`} else {`	464	`} else {`
460	`/* ERROR: OUT OF MEMORY */`	465	`/* ERROR: OUT OF MEMORY */`
461	`}`	466	`}`
462		467
463	`} else if (k == 0x153) { /* DEL */`	468	`} else if (k == 0x153) { /* DEL */`
464	`del(&db, cursorposx, cursorposy, &uidirtyfrom, &uidirtyto);`	469	`del(&db, cursorposx, cursorposy, &uidirtyfrom, &uidirtyto);`
465		470
466	`} else if (k == 0x008) { /* BKSPC */`	471	`} else if (k == 0x008) { /* BKSPC */`
467	`bkspc(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);`	472	`bkspc(&db, &cursorposx, &cursorposy, screenw, &uidirtyfrom, &uidirtyto);`
468		473
-		474	`} else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */`
-		475	`struct line far *n;`
-		476	`n = _frealloc(db.cursor, sizeof(struct line) + db.cursor->len);`
-		477	`if (n != NULL) {`
-		478	`unsigned short off = db.xoffset + cursorposx;`
-		479	`if (n->prev) n->prev->next = n;`
-		480	`if (n->next) n->next->prev = n;`
-		481	`if (db.topscreen == db.cursor) db.topscreen = n;`
-		482	`db.cursor = n;`
-		483	`_fmemmove(db.cursor->payload + off + 1, db.cursor->payload + off, db.cursor->len - off + 1);`
-		484	`db.cursor->len += 1;`
-		485	`uidirtyfrom = cursorposy;`
-		486	`uidirtyto = cursorposy;`
-		487	`db.cursor->payload[off] = k;`
-		488	`cursor_right(&db, &cursorposx, &cursorposy, screenw, screenh, &uidirtyfrom, &uidirtyto);`
-		489	`}`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1560 – Rev 1307 → 1308