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>      /* _dos_open(), _dos_read(), _dos_close(), ... */
#include <fcntl.h>    /* O_RDONLY, O_WRONLY */
#include <stdlib.h>   /* _osmajor symbol provided by Open Watcom */
#include <string.h>
 
#include "mdr\bios.h"
#include "mdr\cout.h"
#include "mdr\dos.h"
 
#include "svarlang\svarlang.h"
 
 
#define PVER "2023.5"
#define PDATE "2023"
 
/*****************************************************************************
 * global variables and definitions                                          *
 *****************************************************************************/
 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
static unsigned char SCHEME_TEXT   = 0x07,
                     SCHEME_MENU   = 0x70,
                     SCHEME_MENU_CUR= 0x0f,
                     SCHEME_MENU_SEL= 0x00,
                     SCHEME_STBAR1 = 0x70,
                     SCHEME_STBAR2 = 0x70, /* greyed out information */
                     SCHEME_STBAR3 = 0x70, /* query */
                     SCHEME_SCROLL = 0x70,
                     SCHEME_MSG    = 0x70,
                     SCHEME_ERR    = 0x70;
 
static unsigned char screenw, screenh, screenlastrow, screenlastcol;
static unsigned char glob_monomode, glob_tablessmode;
 
static struct {
    unsigned char from;
    unsigned char to;
    unsigned char statusbar;
} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */
 
#define SCROLL_CURSOR 0xB1
 
struct line {
  unsigned short len;
  struct line far *next;
  struct line far *prev;
  char payload[1];
};
 
struct file {
  struct line far *cursor;
  unsigned short xoffset;
  unsigned short cursorposx;
  unsigned short cursorposy;
  unsigned short totlines;
  unsigned short curline;
  unsigned short curline_prev;
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
  char modflag;  /* non-zero if file has been modified since last save */
  char modflagprev;
  char fname[128];
};
 
 
/*****************************************************************************
 * functions                                                                 *
 *****************************************************************************/
 
static struct line far *line_calloc(unsigned short siz) {
  struct line far *res;
  unsigned int seg;
 
  if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);
 
  res = MK_FP(seg, 0);
  res->len = 0;
  res->next = NULL;
  res->prev = NULL;
 
  return(res);
}
 
 
static void line_free(struct line far *ptr) {
  _dos_freemem(FP_SEG(ptr));
}
 
 
static int curline_resize(struct file far *db, unsigned short newsiz) {
  unsigned int maxavail;
  struct line far *newptr;
 
  /* try resizing the block (much faster) */
  if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);
 
  /* create a new block and copy data over */
  newptr = line_calloc(newsiz);
  if (newptr == NULL) return(-1);
  _fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
 
  /* rewire the linked list */
  db->cursor = newptr;
  if (newptr->next) newptr->next->prev = newptr;
  if (newptr->prev) newptr->prev->next = newptr;
 
  return(0);
}
 
 
/* adds a new line at cursor position into file linked list and advance cursor
 * returns non-zero on error */
static int line_add(struct file *db, const char far *line, unsigned short slen) {
  struct line far *l;
 
  l = line_calloc(slen);
  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;
  if (slen > 0) {
    _fmemmove(l->payload, line, slen);
    l->len = slen;
  }
 
  db->totlines += 1;
  db->curline += 1;
 
  return(0);
}
 
 
static void ui_getstring(const char *query, char *s, unsigned short maxlen) {
  unsigned short len = 0;
  unsigned char y, x;
  int k;
 
  if (maxlen == 0) return;
  maxlen--; /* make room for the nul terminator */
 
  y = screenlastrow;
 
  /* print query string */
  x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);
  mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);
 
  for (;;) {
    mdr_cout_locate(y, x + len);
    k = mdr_dos_getkey2();
 
    switch (k) {
      case 0x1b: /* ESC */
        s[0] = 0;
        return;
      case '\r':
        s[len] = 0;
        return;
      case 0x08: /* BKSPC */
        if (len > 0) {
          len--;
          mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);
        }
        break;
      default:
        if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
          mdr_cout_char(y, x + len, k, SCHEME_STBAR3);
          s[len++] = k;
        }
    }
  }
 
}
 
 
/* append a nul-terminated string to line at cursor position */
static int line_append(struct file *f, const char far *buf, unsigned short len) {
  if (sizeof(struct line) + f->cursor->len + len < len) goto ERR; /* overflow check */
  if (curline_resize(f, f->cursor->len + len) != 0) goto ERR;
 
  _fmemmove(f->cursor->payload + f->cursor->len, buf, len);
  f->cursor->len += len;
 
  return(0);
  ERR:
  return(-1);
}
 
 
static void db_rewind(struct file *db) {
  if (db->cursor == NULL) return;
  while (db->cursor->prev) db->cursor = db->cursor->prev;
  db->curline = 0;
}
 
 
/* saves db file, resets db->modflag on success and overwrites the filename
 * field if saveas is not NULL */
static int savefile(struct file *db, const char *saveas) {
  int fd = 0;
  const struct line far *l;
  unsigned int bytes;
  unsigned char eollen = 2;
  const unsigned char *eolbuf = "\r\n";
  int errflag = 0;
 
  /* if filename not overloaded then use the fname in db */
  if (saveas == NULL) saveas = db->fname;
 
  _asm {
    push ax
    push cx
    push dx
 
    mov ah, 0x3C    /* create or truncate file */
    xor cx, cx      /* file attributes */
    mov dx, saveas  /* works only in SMALL/TINY mode */
    int 0x21
    jnc DONE
    mov errflag, ax
    DONE:
    mov fd, ax
 
    pop dx
    pop cx
    pop ax
  }
 
  if (errflag != 0) return(-1);
 
  l = db->cursor;
  while (l->prev) l = l->prev;
 
  /* preset line terminators */
  if (db->lfonly) {
    eolbuf++;
    eollen--;
  }
 
  while (l) {
    /* do not write the last empty line, it is only useful for edition */
    if (l->len != 0) {
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
    } else if (l->next == NULL) {
      break;
    }
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
    l = l->next;
  }
 
  errflag |= _dos_close(fd);
 
  /* did it all work? */
  if (errflag == 0) {
    db->modflag = 0;
    if (saveas != db->fname) mdr_dos_truename(db->fname, saveas);
  }
 
  return(errflag);
}
 
 
static void ui_statusbar(const struct file *db, unsigned char slotnum) {
  const char *s = svarlang_strid(0); /* ESC=MENU */
  unsigned short helpcol = screenw - strlen(s);
  unsigned short col;
 
  /* slot number (guaranteed to be 0-9) */
  {
    char slot[4] = "#00";
    if (slotnum == 9) {
      slot[1] = '1';
    } else {
      slotnum++;
      slot[2] += slotnum;
    }
    mdr_cout_str(screenlastrow, 0, slot, SCHEME_STBAR2, 3);
  }
 
  /* fill rest of status bar with background */
  mdr_cout_char_rep(screenlastrow, 3, ' ', SCHEME_STBAR1, helpcol - 3);
 
  /* eol type */
  {
    const char *eoltype = "CRLF";
    if (db->lfonly) eoltype += 2;
    mdr_cout_str(screenlastrow, helpcol - 5, eoltype, SCHEME_STBAR1, 5);
  }
 
  /* line numbers */
  {
    unsigned short x;
    unsigned char count = 0;
    col = helpcol - 7;
 
    x = db->totlines;
    AGAIN:
    do {
      mdr_cout_char(screenlastrow, col--, '0' + (x % 10), SCHEME_STBAR1);
      x /= 10;
    } while (x);
    /* redo same exercise, but printing the current line now */
    if (count == 0) {
      count = 1;
      mdr_cout_char(screenlastrow, col--, '/', SCHEME_STBAR1);
      x = 1 + db->curline;
      goto AGAIN;
    }
  }
 
  /* filename and modflag */
  {
    const char *fn;
    unsigned short x;
    unsigned short maxfnlen = col - 6;
    if (db->fname[0] == 0) {
      fn = svarlang_str(0, 1); /* "UNTITLED" */
    } else {
      /* display filename up to maxfnlen chars */
      fn = db->fname;
      x = strlen(fn);
      if (x > maxfnlen) fn += x - maxfnlen;
    }
    x = mdr_cout_str(screenlastrow, 4, fn, SCHEME_STBAR1, maxfnlen);
    if (db->modflag) mdr_cout_char(screenlastrow, 5 + x, '!', SCHEME_STBAR2);
  }
 
  mdr_cout_str(screenlastrow, helpcol, s, SCHEME_STBAR2, 40);
}
 
 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
  unsigned short x, y, msglen, i;
  unsigned short msg2flag = 0;
 
  msglen = strlen(msg1);
  if (msg2) {
    msg2flag = 1;
    i = strlen(msg2);
    if (i > msglen) msglen = i;
  }
 
  y = (screenh - 6) >> 1;
  x = (screenw - msglen - 3) >> 1;
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
  x++;
 
  mdr_cout_str(y+1, x, msg1, attr, msglen);
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
 
  if (uidirty.from > y) uidirty.from = y;
  if (uidirty.to < y+4) uidirty.to = y+4;
}
 
 
/* returns 0 if operation may proceed, non-zero to cancel */
static unsigned char ui_confirm_if_unsaved(struct file *db) {
  int k;
 
  if (db->modflag == 0) return(0);
 
  mdr_cout_cursor_hide();
 
  /* if file has been modified then ask for confirmation:
   * ENTER        : agree to data loss
   * SPACE        : SAVE file before quit (only if valid filename present)
   * anything else: ABORT */
  ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);
 
  k = mdr_dos_getkey2();
  mdr_cout_cursor_show();
 
  /* ENTER = agree to loose unsaved data */
  if (k == '\r') return(0);
 
  /* SPACE = save file and continue */
  if ((k == ' ') && (db->fname[0] != 0) && (savefile(db, NULL) == 0)) return(0);
 
  /* any other key = cancel operation */
  return(1);
}
 
 
static void ui_refresh(const struct file *db) {
  unsigned char x;
  const struct line far *l;
  unsigned char y = db->cursorposy;
 
  /* quit early if nothing to refresh */
  if (uidirty.from == 0xff) return;
 
#ifdef DBG_REFRESH
  static char m = 'a';
  m++;
  if (m > 'z') m = 'a';
#endif
 
  /* rewind cursor line to first line that needs redrawing */
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
 
  /* iterate over lines and redraw whatever needs to be redrawn */
  for (; l != NULL; l = l->next, y++) {
 
    /* skip lines that do not need to be refreshed */
    if (y < uidirty.from) continue;
    if (y > uidirty.to) break;
 
    x = 0;
    if (db->xoffset < l->len) {
      unsigned char i, limit;
      if (l->len - db->xoffset < screenw) {
        limit = l->len;
      } else {
        limit = db->xoffset + screenlastcol;
      }
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
    }
 
    /* write empty spaces until end of line */
    if (x < screenlastcol) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenlastcol - x);
 
#ifdef DBG_REFRESH
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
#endif
 
    if (y == screenh - 2) break;
  }
 
  /* fill all lines below if empty (and they need to be redrawn) */
  if (l == NULL) {
    while ((y < screenlastrow) && (y < uidirty.to)) {
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenlastcol);
    }
  }
 
  /* scroll bar */
  for (y = 0; y < screenlastrow; y++) {
    mdr_cout_char(y, screenlastcol, SCROLL_CURSOR, SCHEME_SCROLL);
  }
 
  /* scroll cursor */
  if (db->totlines >= screenh) {
    unsigned short topline = db->curline - db->cursorposy;
    unsigned short col;
    unsigned short totlines = db->totlines - screenh + 1;
    if (db->totlines - screenh > screenh) {
      col = topline / (totlines / screenlastrow);
    } else {
      col = topline * screenlastrow / totlines;
    }
    if (col >= screenlastrow) col = screenh - 2;
    mdr_cout_char(col, screenlastcol, ' ', SCHEME_SCROLL);
  }
 
  /* clear out the dirty flag */
  uidirty.from = 0xff;
}
 
 
static void check_cursor_not_after_eol(struct file *db) {
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
 
  if (db->cursor->len < db->xoffset) {
    db->cursorposx = 0;
    db->xoffset = db->cursor->len;
    uidirty.from = 0;
    uidirty.to = 0xff;
  } else {
    db->cursorposx = db->cursor->len - db->xoffset;
  }
}
 
 
static void cursor_up(struct file *db) {
  if (db->cursor->prev == NULL) return;
 
  db->curline -= 1;
  db->cursor = db->cursor->prev;
  if (db->cursorposy == 0) {
    uidirty.from = 0;
    uidirty.to = 0xff;
  } else {
    db->cursorposy -= 1;
  }
}
 
 
static void cursor_eol(struct file *db) {
  /* adjust xoffset to make sure eol is visible on screen */
  if (db->xoffset > db->cursor->len) {
    db->xoffset = db->cursor->len - 1;
    uidirty.from = 0;
    uidirty.to = 0xff;
  }
 
  if (db->xoffset + screenlastcol <= db->cursor->len) {
    db->xoffset = db->cursor->len - screenw + 2;
    uidirty.from = 0;
    uidirty.to = 0xff;
  }
  db->cursorposx = db->cursor->len - db->xoffset;
}
 
 
static void cursor_down(struct file *db) {
  if (db->cursor->next == NULL) return;
 
  db->curline += 1;
  db->cursor = db->cursor->next;
  if (db->cursorposy < screenh - 2) {
    db->cursorposy += 1;
  } else {
    uidirty.from = 0;
    uidirty.to = 0xff;
  }
}
 
 
static void cursor_left(struct file *db) {
  if (db->cursorposx > 0) {
    db->cursorposx -= 1;
  } else if (db->xoffset > 0) {
    db->xoffset -= 1;
    uidirty.from = 0;
    uidirty.to = 0xff;
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
    cursor_up(db);
    cursor_eol(db);
  }
}
 
 
static void cursor_home(struct file *db) {
  db->cursorposx = 0;
  if (db->xoffset != 0) {
    db->xoffset = 0;
    uidirty.from = 0;
    uidirty.to = 0xff;
  }
}
 
 
static void cursor_right(struct file *db) {
  if (db->cursor->len > db->xoffset + db->cursorposx) {
    if (db->cursorposx < screenw - 2) {
      db->cursorposx += 1;
    } else {
      db->xoffset += 1;
      uidirty.from = 0;
      uidirty.to = 0xff;
    }
  } else if (db->cursor->next != NULL) { /* jump to start of next line */
    cursor_down(db);
    cursor_home(db);
  }
}
 
 
static void del(struct file *db) {
  if (db->cursorposx + db->xoffset < db->cursor->len) {
    _fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
    uidirty.from = db->cursorposy;
    uidirty.to = db->cursorposy;
    db->modflag = 1;
  } 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) {
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
        _fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
        db->cursor->len += db->cursor->next->len;
      }
    }
 
    db->cursor->next = db->cursor->next->next;
    db->cursor->next->prev = db->cursor;
 
    line_free(nextline);
    uidirty.from = db->cursorposy;
    uidirty.to = 0xff;
    db->totlines -= 1;
    db->modflag = 1;
  }
}
 
 
static void bkspc(struct file *db) {
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
  if ((db->cursorposx + db->xoffset == 0) && (db->cursor->prev == NULL)) return;
 
  cursor_left(db);
  del(db);
}
 
 
#define LOADFILE_FILENOTFOUND 2
 
/* returns 0 on success, 1 on file not found, 2 on other error */
static unsigned char loadfile(struct file *db, const char *fname) {
  char buff[512]; /* read one entire sector at a time (faster) */
  char *buffptr;
  unsigned int len, llen;
  int fd;
  unsigned char eolfound;
  unsigned char err = 0;
 
  /* free the entire linked list of lines */
  db_rewind(db);
  while (db->cursor) {
    struct line far *victim;
    victim = db->cursor;
    db->cursor = db->cursor->next;
    line_free(victim);
  }
 
  /* zero out the struct */
  bzero(db, sizeof(struct file));
 
  /* start by adding an empty line */
  if (line_add(db, NULL, 0) != 0) return(2);
 
  if (fname == NULL) goto SKIPLOADING;
 
  /* make the filename canonical (DOS 3+ only, on earlier versions it just copies the filename) */
 
  mdr_dos_truename(db->fname, fname);
 
 
 
 
 
 
 
  err = _dos_open(fname, O_RDONLY, &fd);
  if (err != 0) goto SKIPLOADING;
 
  db->lfonly = 1;
 
  for (eolfound = 0;;) {
    unsigned short consumedbytes;
 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
    buffptr = buff;
 
    FINDLINE:
 
    /* look for nearest \n (also expand tabs) */
    for (consumedbytes = 0;; consumedbytes++) {
 
      if (buffptr[consumedbytes] == '\t') {
        llen = consumedbytes;
        break;
      }
 
      if (consumedbytes == len) {
        llen = consumedbytes;
        break;
      }
      if (buffptr[consumedbytes] == '\r') {
        llen = consumedbytes;
        consumedbytes++;
        db->lfonly = 0;
        break;
      }
      if (buffptr[consumedbytes] == '\n') {
        eolfound = 1;
        llen = consumedbytes;
        consumedbytes++;
        break;
      }
    }
 
    /* consumedbytes is the amount of bytes processed from buffptr,
     * llen is the length of line's payload (without its line terminator) */
 
    /* append content, if line is non-empty */
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
      goto IOERR;
    }
 
    /* allocate the next line if current line ended */
    if (eolfound) {
      if (line_add(db, NULL, 0) != 0) {
        goto IOERR;
      }
      eolfound = 0;
    }
 
    /* append 8 spaces if tab char found */
    if ((consumedbytes < len) && (buffptr[consumedbytes] == '\t') && (glob_tablessmode == 0)) {
      consumedbytes++;
      if (line_append(db, "        ", 8) != 0) {
        goto IOERR;
      }
    }
 
    /* anything left? process the buffer leftover again */
    if (consumedbytes < len) {
      len -= consumedbytes;
      buffptr += consumedbytes;
      goto FINDLINE;
    }
 
  }
 
  _dos_close(fd);
 
  SKIPLOADING:
 
  /* rewind cursor to top of file because it has been used by line_add() */
  db_rewind(db);
 
  return(err);
 
  IOERR:
  _dos_close(fd);
  return(1);
}
 
 
/* 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
 * returns non-zero on error */
static int parseargv(struct file *dbarr) {
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
  unsigned short count = 0;
  char *arg;
  unsigned short lastarg = 0;
  unsigned char err;
 
  while (!lastarg) {
    /* jump to nearest arg */
    while (*tail == ' ') {
      *tail = 0;
      tail++;
    }
 
    if (*tail == '\r') {
      *tail = 0;
      break;
    }
 
    arg = tail;
 
    /* jump to next delimiter */
    while ((*tail != ' ') && (*tail != '\r')) tail++;
 
    /* if \r then remember this is the last arg */
    if (*tail == '\r') lastarg = 1;
 
    *tail = 0;
    tail++;
 
    /* look at the arg now */
    if (*arg == '/') {
      if (arg[1] == 't') { /* /t = do not expand tabs */
        glob_tablessmode = 1;
 
      } else if (arg[1] == 'm') { /* /m = force mono mode */
        glob_monomode = 1;
 
      } else {  /* help screen */
        mdr_coutraw_str(svarlang_str(1,3)); /* Sved, the SvarDOS editor */
        mdr_coutraw_str(" [");
        mdr_coutraw_str(svarlang_str(1,4)); /* ver */
        mdr_coutraw_puts(" " PVER "]");
        mdr_coutraw_puts("Copyright (C) " PDATE " Mateusz Viste");
        mdr_coutraw_crlf();
        mdr_coutraw_str("sved [/m] [/t] ");
        mdr_coutraw_puts(svarlang_str(1,1)); /* args syntax */
        mdr_coutraw_crlf();
        mdr_coutraw_puts(svarlang_str(1,10)); /* /m */
        mdr_coutraw_puts(svarlang_str(1,11)); /* /t */
        return(-1);
      }
      continue;
    }
 
    /* looks to be a filename */
    if (count == 10) {
      mdr_coutraw_puts(svarlang_str(0,12)); /* too many files */
      return(-1);
    }
 
    /* try loading it */
    mdr_coutraw_str(svarlang_str(1,2));
    mdr_coutraw_char(' ');
    mdr_coutraw_puts(arg);
    err = loadfile(&(dbarr[count]), arg);
    if (err) {
      if (err == LOADFILE_FILENOTFOUND) { /* file not found */
        if ((count == 0) && (lastarg != 0)) { /* a 'file not found' is fine if only one file was given */
          err = 0;
        } else {
          err = 11;
        }
      } else { /* general error */
        err = 10;
      }
      if (err) {
        mdr_coutraw_puts(svarlang_str(0,err));
        return(-1);
      }
    }
    count++;
  }
 
  return(0);
}
 
 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
  if (curline_resize(db, db->cursor->len + len) == 0) {
    unsigned short off = db->xoffset + db->cursorposx;
    db->modflag = 1;
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
    db->cursor->len += len;
    uidirty.from = db->cursorposy;
    uidirty.to = db->cursorposy;
    while (len--) {
      db->cursor->payload[off++] = *databuf;
      databuf++;
      cursor_right(db);
    }
  }
}
 
 
/* recompute db->curline by counting nodes in linked list */
static void recompute_curline(struct file *db) {
  const struct line far *l = db->cursor;
 
  db->curline = 0;
  while (l->prev != NULL) {
    db->curline += 1;
    l = l->prev;
  }
}
 
 
enum MENU_ACTION {
  MENU_NONE   = 0,
  MENU_OPEN   = 1,
  MENU_SAVE   = 2,
  MENU_SAVEAS = 3,
  MENU_CLOSE  = 4,
  MENU_CHGEOL = 5,
  MENU_QUIT   = 6
};
 
static enum MENU_ACTION ui_menu(void) {
  unsigned short i, curchoice, attr, x, slen;
  unsigned short xorigin, yorigin;
 
  /* find out the longest string */
  slen = 0;
  for (i = MENU_OPEN; i <= MENU_QUIT; i++) {
    x = strlen(svarlang_str(8, i));
    if (x > slen) slen = x;
  }
 
  /* calculate where to draw the menu on screen */
  xorigin = (screenw - (slen + 5)) / 2;
  yorigin = (screenh - (MENU_QUIT - MENU_OPEN + 6)) / 2;
 
  /* */
  uidirty.from = yorigin;
  uidirty.to = 0xff;
  uidirty.statusbar = 1;
 
  /* hide the cursor */
  mdr_cout_cursor_hide();
 
  curchoice = MENU_OPEN;
  for (;;) {
    /* render menu */
    for (i = MENU_NONE; i <= MENU_QUIT + 1; i++) {
      mdr_cout_char_rep(yorigin + i, xorigin, ' ', SCHEME_MENU, slen+4);
      if (i == curchoice) {
        attr = SCHEME_MENU_CUR;
        mdr_cout_char_rep(yorigin + i, xorigin + 1, ' ', SCHEME_MENU_SEL, slen + 2);
      } else {
        attr = SCHEME_MENU;
      }
      mdr_cout_str(yorigin + i, xorigin + 2, svarlang_str(8, i), attr, slen);
    }
    /* wait for key */
    switch (mdr_dos_getkey2()) {
      case 0x150: /* down */
        if (curchoice == MENU_QUIT) {
          curchoice = MENU_OPEN;
        } else {
          curchoice++;
        }
        break;
      case 0x148: /* up */
        if (curchoice == MENU_OPEN) {
          curchoice = MENU_QUIT;
        } else {
          curchoice--;
        }
        break;
      default:
        curchoice = MENU_NONE;
        /* FALLTHRU */
      case '\r': /* ENTER */
        mdr_cout_cursor_show();
        return(curchoice);
    }
  }
}
 
 
static struct file *select_slot(struct file *dbarr, unsigned char curfile) {
  uidirty.from = 0;
  uidirty.to = 0xff;
  uidirty.statusbar = 1;
 
  dbarr = &(dbarr[curfile]);
  /* force redraw now, because the main() routine might not if this is exit
   * time and we want to show the user which file has unsaved changes */
  ui_statusbar(dbarr, curfile);
  ui_refresh(dbarr);
  return(dbarr);
}
 
 
/* main returns nothing, ie. sved always exits with a zero exit code
 * (this saves 20 bytes of executable footprint) */
void main(void) {
  static struct file dbarr[10];
  unsigned char curfile;
  struct file *db = dbarr; /* visible file is the first slot by default */
  struct line far *clipboard = NULL;
  static unsigned char original_breakflag;
 
  { /* load NLS resource */
    unsigned short i = 0;
    const char far *selfptr;
    char self[128], lang[8];
    selfptr = mdr_dos_selfexe();
    if (selfptr != NULL) {
      do {
        self[i] = selfptr[i];
      } while (self[i++] != 0);
      svarlang_autoload_exepath(self, mdr_dos_getenv(lang, "LANG", sizeof(lang)));
    }
  }
 
  /* preload all slots with empty files */
  for (curfile = 9;; curfile--) {
    loadfile(&(dbarr[curfile]), NULL);
    if (curfile == 0) break;
  }
 
  /* parse argv (and load files, if any passed on) */
  if (parseargv(dbarr) != 0) return;
 
  if ((mdr_cout_init(&screenw, &screenh) != 0) && (glob_monomode == 0)) {
    /* load color scheme if mdr_cout_init returns a color flag */
    SCHEME_TEXT = 0x17;
    SCHEME_MENU = 0x70;
    SCHEME_MENU_CUR = 0x6f;
    SCHEME_MENU_SEL = 0x66;
    SCHEME_STBAR1 = 0x70;
    SCHEME_STBAR2 = 0x78;
    SCHEME_STBAR3 = 0x3f;
    SCHEME_SCROLL = 0x70;
    SCHEME_MSG = 0x6f;
    SCHEME_ERR = 0x4f;
  }
  screenlastrow = screenh - 1;
  screenlastcol = screenw - 1;
 
  /* instruct DOS to stop detecting CTRL+C because user needs it for
   * copy/paste operations. also remember the original status of the BREAK
   * flag so I can restore it as it was before quitting. */
  original_breakflag = mdr_dos_ctrlc_disable();
 
  for (;;) {
    int k;
 
    /* add an extra empty line if cursor is on last line and this line is not empty */
    if ((db->cursor->next == NULL) && (db->cursor->len != 0)) {
      if (line_add(db, NULL, 0) == 0) {
        db->cursor = db->cursor->prev; /* line_add() changes the cursor pointer */
        db->curline -= 1;
      }
    }
 
    check_cursor_not_after_eol(db);
    mdr_cout_locate(db->cursorposy, db->cursorposx);
 
    ui_refresh(db);
 
    if ((uidirty.statusbar != 0) || (db->modflagprev != db->modflag) || (db->curline_prev != db->curline)) {
      ui_statusbar(db, curfile);
      uidirty.statusbar = 0;
      db->modflagprev = db->modflag;
      db->curline_prev = db->curline;
    }
#ifdef DBG_LINENUM
      {
        char ddd[10];
        db->curline += 1;
        ddd[0] = '0' + db->curline / 100;
        ddd[1] = '0' + (db->curline % 100) / 10;
        ddd[2] = '0' + (db->curline % 10);
        db->curline -= 1;
        ddd[3] = '/';
        ddd[4] = '0' + db->totlines / 100;
        ddd[5] = '0' + (db->totlines % 100) / 10;
        ddd[6] = '0' + (db->totlines % 10);
        ddd[7] = 0;
        mdr_cout_str(screenh - 1, 40, ddd, SCHEME_STBAR1, sizeof(ddd));
      }
#endif
 
    k = mdr_dos_getkey2();
 
    if (k == 0x150) { /* down */
      cursor_down(db);
 
    } else if (k == 0x148) { /* up */
      cursor_up(db);
 
    } else if (k == 0x14D) { /* right */
      cursor_right(db);
 
    } else if (k == 0x14B) { /* left */
      cursor_left(db);
 
    } else if (k == 0x149) { /* pgup */
      unsigned char dist = db->cursorposy + screenh - 1;
      while ((dist != 0) && (db->cursor->prev != NULL)) {
        db->cursor = db->cursor->prev;
        dist--;
      }
      if (dist != 0) {
        db->cursorposy = 0;
        db->cursorposx = 0;
      } else {
        dist = db->cursorposy;
        while ((dist--) && (db->cursor->next)) db->cursor = db->cursor->next;
      }
      uidirty.from = 0;
      uidirty.to = 0xff;
      recompute_curline(db);
 
    } else if (k == 0x151) { /* pgdown */
      unsigned char dist = screenh + screenh - db->cursorposy - 3;
      while ((dist != 0) && (db->cursor->next != NULL)) {
        db->cursor = db->cursor->next;
        dist--;
      }
      if (dist != 0) {
        db->cursorposy = screenh - 2;
        if (db->totlines <= db->cursorposy) db->cursorposy = db->totlines - 1;
        db->cursorposx = 0;
      } else {
        dist = screenh - 2 - db->cursorposy;
        while ((dist--) && (db->cursor->prev)) db->cursor = db->cursor->prev;
      }
      uidirty.from = 0;
      uidirty.to = 0xff;
      recompute_curline(db);
 
    } else if (k == 0x147) { /* home */
       cursor_home(db);
 
    } else if (k == 0x14F) { /* end */
       cursor_eol(db);
 
    } else if (k == 0x1B) { /* ESC */
      int quitnow = 0;
      char fname[64];
      int saveflag = 0;
      enum MENU_ACTION ui_action;
 
      /* collect the exact menu action and clear the screen */
      ui_action = ui_menu();
      ui_refresh(db);
 
      switch (ui_action) {
 
        case MENU_NONE:
          break;
 
        case MENU_OPEN:
          /* display a warning if unsaved changes are pending */
          if (db->modflag != 0) ui_msg(svarlang_str(0,4), svarlang_str(0,8), SCHEME_MSG);
 
          /* ask for filename */
          ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
          if (fname[0] != 0) {
            unsigned char err;
            err = loadfile(db, fname);
            if (err != 0) {
              if (err == LOADFILE_FILENOTFOUND) {
                ui_msg(svarlang_str(0,11), NULL, SCHEME_ERR); /* file not found */
              } else {
                ui_msg(svarlang_str(0,10), NULL, SCHEME_ERR);  /* ERROR */
              }
              mdr_bios_tickswait(44); /* 3s */
              loadfile(db, NULL);
            }
          }
          uidirty.from = 0;
          uidirty.to = 0xff;
          uidirty.statusbar = 1;
          break;
 
        case MENU_SAVEAS:
          saveflag = 1;
          /* FALLTHRU */
        case MENU_SAVE:
          if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
            ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
            if (*fname == 0) break;
            saveflag = savefile(db, fname);
          } else {
            saveflag = savefile(db, NULL);
          }
 
          mdr_cout_cursor_hide();
 
          if (saveflag == 0) {
            ui_msg(svarlang_str(0, 2), NULL, SCHEME_MSG);
            mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
          } else {
            ui_msg(svarlang_str(0, 10), NULL, SCHEME_ERR);
            mdr_bios_tickswait(36); /* 2s */
          }
          mdr_cout_cursor_show();
          break;
 
        case MENU_CLOSE:
          if (ui_confirm_if_unsaved(db) == 0) {
            loadfile(db, NULL);
          }
          uidirty.from = 0;
          uidirty.to = 0xff;
          uidirty.statusbar = 1;
          break;
 
        case MENU_CHGEOL:
          db->modflag = 1;
          db->lfonly ^= 1;
          break;
 
        case MENU_QUIT:
          quitnow = 1;
          for (curfile = 0; curfile < 10; curfile++) {
            if (dbarr[curfile].modflag) {
              db = select_slot(dbarr, curfile);
              if (ui_confirm_if_unsaved(db) != 0) {
                quitnow = 0;
                break;
              }
            }
          }
          break;
      }
 
      if (quitnow) break;
 
    } else if (k == 0x0D) { /* ENTER */
      unsigned short off = db->xoffset + db->cursorposx;
      /* add a new line */
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
        db->modflag = 1;
        db->cursor = db->cursor->prev; /* back to original line */
        db->curline -= 1;
        /* trim the line above */
        db->cursor->len = off;
        /* move cursor to the (new) line below */
        uidirty.from = db->cursorposy;
        uidirty.to = 0xff;
        cursor_down(db);
        cursor_home(db);
      } else {
        /* ERROR: OUT OF MEMORY */
      }
 
    } else if (k == 0x153) {  /* DEL */
      del(db);
 
    } else if (k == 0x008) { /* BKSPC */
      bkspc(db);
 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
      char c = k;
      insert_in_line(db, &c, 1);
 
    } else if (k == 0x009) { /* TAB */
      if (glob_tablessmode == 0) {
        insert_in_line(db, "        ", 8);
      } else {
        insert_in_line(db, "\t", 1);
      }
 
    } else if ((k >= 0x13b) && (k <= 0x144)) { /* F1..F10 */
      curfile = k - 0x13b;
      db = select_slot(dbarr, curfile);
 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
      for (;;) {
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
        cursor_right(db);
      }
      /* now skip to next non-space or end of file */
      for (;;) {
        cursor_right(db);
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
      }
 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
      cursor_left(db);
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
      for (;;) {
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
        cursor_left(db);
      }
      /* now skip to next space or start of file */
      for (;;) {
        cursor_left(db);
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
          cursor_right(db);
          break;
        }
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
      }
 
    } else if ((k == 0x003) || (k == 0x018)) { /* CTRL+C or CTRL+X */
      /* free clipboard if anything in it */
      if (clipboard != NULL) line_free(clipboard);
 
      /* copy cursor line to clipboard */
      clipboard = line_calloc(db->cursor->len);
      if (clipboard == NULL) {
        ui_msg(svarlang_str(0, 10), NULL, SCHEME_ERR); /* ERROR */
        mdr_bios_tickswait(18); /* 1s */
      } else {
        mdr_cout_char_rep(db->cursorposy, 0, ' ', ((SCHEME_TEXT >> 4) | (SCHEME_TEXT << 4)) & 0xff, screenlastcol);
        uidirty.from = db->cursorposy;
        uidirty.to = db->cursorposy;
        if (db->cursor->len != 0) {
          _fmemmove(clipboard->payload, db->cursor->payload, db->cursor->len);
          clipboard->len = db->cursor->len;
        }
        mdr_bios_tickswait(2); /* ca 100ms */
 
        /* if this is about cutting the line (CTRL+X) then delete cur line */
        if ((k == 0x018) && ((db->cursor->next != NULL) || (db->cursor->prev != NULL))) {
          if (db->cursor->next) db->cursor->next->prev = db->cursor->prev;
          if (db->cursor->prev) db->cursor->prev->next = db->cursor->next;
          clipboard->prev = db->cursor;
          if (db->cursor->next) {
            db->cursor = db->cursor->next;
          } else {
            cursor_up(db);
          }
          line_free(clipboard->prev);
          db->totlines -= 1;
          uidirty.from = 0;
          uidirty.to = 0xff;
          recompute_curline(db);
        }
      }
 
    } else if ((k == 0x016) && (clipboard != NULL)) { /* CTRL+V */
      if (line_add(db, clipboard->payload, clipboard->len) != 0) {
        ui_msg(svarlang_str(0, 10), NULL, SCHEME_ERR); /* ERROR */
        mdr_bios_tickswait(18); /* 1s */
      } else {
        /* rewire the linked list so the new line is on top of the previous one */
        clipboard->prev = db->cursor->prev;
        /* remove prev node from list */
        db->cursor->prev = db->cursor->prev->prev;
        if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor;
        /* insert the node after cursor now */
        clipboard->prev->next = db->cursor->next;
        if (db->cursor->next != NULL) db->cursor->next->prev = clipboard->prev;
        clipboard->prev->prev = db->cursor;
        db->cursor->next = clipboard->prev;
        cursor_down(db);
      }
      uidirty.from = 0;
      uidirty.to = 0xff;
      recompute_curline(db);
 
#ifdef DBG_UNHKEYS
    } 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_STBAR1, 17);
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
      mdr_dos_getkey2();
      break;
#endif
    }
  }
 
  mdr_cout_close();
 
  /* restore the DOS BREAK flag if it was originally set */
  if (original_breakflag != 0) mdr_dos_ctrlc_enable();
 
  /* no need to free memory, DOS will do it for me */
 
  return;
}
 

Rev 1541	Rev 1543
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> /* _dos_open(), _dos_read(), _dos_close(), ... */`	26	`#include <dos.h> /* _dos_open(), _dos_read(), _dos_close(), ... */`
27	`#include <fcntl.h> /* O_RDONLY, O_WRONLY */`	27	`#include <fcntl.h> /* O_RDONLY, O_WRONLY */`
28	`#include <stdlib.h> /* _osmajor symbol provided by Open Watcom */`	28	`#include <stdlib.h> /* _osmajor symbol provided by Open Watcom */`
29	`#include <string.h>`	29	`#include <string.h>`
30		30
31	`#include "mdr\bios.h"`	31	`#include "mdr\bios.h"`
32	`#include "mdr\cout.h"`	32	`#include "mdr\cout.h"`
33	`#include "mdr\dos.h"`	33	`#include "mdr\dos.h"`
34		34
35	`#include "svarlang\svarlang.h"`	35	`#include "svarlang\svarlang.h"`
36		36
37		37
38	`#define PVER "2023.5"`	38	`#define PVER "2023.5"`
39	`#define PDATE "2023"`	39	`#define PDATE "2023"`
40		40
41	`/*****************************************************************************`	41	`/*****************************************************************************`
42	`* global variables and definitions *`	42	`* global variables and definitions *`
43	`*****************************************************************************/`	43	`*****************************************************************************/`
44		44
45	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`	45	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`
46	`static unsigned char SCHEME_TEXT = 0x07,`	46	`static unsigned char SCHEME_TEXT = 0x07,`
47	`SCHEME_MENU = 0x70,`	47	`SCHEME_MENU = 0x70,`
48	`SCHEME_MENU_CUR= 0x0f,`	48	`SCHEME_MENU_CUR= 0x0f,`
49	`SCHEME_MENU_SEL= 0x00,`	49	`SCHEME_MENU_SEL= 0x00,`
50	`SCHEME_STBAR1 = 0x70,`	50	`SCHEME_STBAR1 = 0x70,`
51	`SCHEME_STBAR2 = 0x70, /* greyed out information */`	51	`SCHEME_STBAR2 = 0x70, /* greyed out information */`
52	`SCHEME_STBAR3 = 0x70, /* query */`	52	`SCHEME_STBAR3 = 0x70, /* query */`
53	`SCHEME_SCROLL = 0x70,`	53	`SCHEME_SCROLL = 0x70,`
54	`SCHEME_MSG = 0x70,`	54	`SCHEME_MSG = 0x70,`
55	`SCHEME_ERR = 0x70;`	55	`SCHEME_ERR = 0x70;`
56		56
57	`static unsigned char screenw, screenh, screenlastrow, screenlastcol;`	57	`static unsigned char screenw, screenh, screenlastrow, screenlastcol;`
58	`static unsigned char glob_monomode, glob_tablessmode;`	58	`static unsigned char glob_monomode, glob_tablessmode;`
59		59
60	`static struct {`	60	`static struct {`
61	`unsigned char from;`	61	`unsigned char from;`
62	`unsigned char to;`	62	`unsigned char to;`
63	`unsigned char statusbar;`	63	`unsigned char statusbar;`
64	`} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */`	64	`} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */`
65		65
66	`#define SCROLL_CURSOR 0xB1`	66	`#define SCROLL_CURSOR 0xB1`
67		67
68	`struct line {`	68	`struct line {`
69	`unsigned short len;`	69	`unsigned short len;`
70	`struct line far *next;`	70	`struct line far *next;`
71	`struct line far *prev;`	71	`struct line far *prev;`
72	`char payload[1];`	72	`char payload[1];`
73	`};`	73	`};`
74		74
75	`struct file {`	75	`struct file {`
76	`struct line far *cursor;`	76	`struct line far *cursor;`
77	`unsigned short xoffset;`	77	`unsigned short xoffset;`
78	`unsigned short cursorposx;`	78	`unsigned short cursorposx;`
79	`unsigned short cursorposy;`	79	`unsigned short cursorposy;`
80	`unsigned short totlines;`	80	`unsigned short totlines;`
81	`unsigned short curline;`	81	`unsigned short curline;`
82	`unsigned short curline_prev;`	82	`unsigned short curline_prev;`
83	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`	83	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`
84	`char modflag; /* non-zero if file has been modified since last save */`	84	`char modflag; /* non-zero if file has been modified since last save */`
85	`char modflagprev;`	85	`char modflagprev;`
86	`char fname[128];`	86	`char fname[128];`
87	`};`	87	`};`
88		88
89		89
90	`/*****************************************************************************`	90	`/*****************************************************************************`
91	`* functions *`	91	`* functions *`
92	`*****************************************************************************/`	92	`*****************************************************************************/`
93		93
94	`static struct line far *line_calloc(unsigned short siz) {`	94	`static struct line far *line_calloc(unsigned short siz) {`
95	`struct line far *res;`	95	`struct line far *res;`
96	`unsigned int seg;`	96	`unsigned int seg;`
97		97
98	`if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);`	98	`if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);`
99		99
100	`res = MK_FP(seg, 0);`	100	`res = MK_FP(seg, 0);`
101	`res->len = 0;`	101	`res->len = 0;`
102	`res->next = NULL;`	102	`res->next = NULL;`
103	`res->prev = NULL;`	103	`res->prev = NULL;`
104		104
105	`return(res);`	105	`return(res);`
106	`}`	106	`}`
107		107
108		108
109	`static void line_free(struct line far *ptr) {`	109	`static void line_free(struct line far *ptr) {`
110	`_dos_freemem(FP_SEG(ptr));`	110	`_dos_freemem(FP_SEG(ptr));`
111	`}`	111	`}`
112		112
113		113
114	`static int curline_resize(struct file far *db, unsigned short newsiz) {`	114	`static int curline_resize(struct file far *db, unsigned short newsiz) {`
115	`unsigned int maxavail;`	115	`unsigned int maxavail;`
116	`struct line far *newptr;`	116	`struct line far *newptr;`
117		117
118	`/* try resizing the block (much faster) */`	118	`/* try resizing the block (much faster) */`
119	`if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);`	119	`if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);`
120		120
121	`/* create a new block and copy data over */`	121	`/* create a new block and copy data over */`
122	`newptr = line_calloc(newsiz);`	122	`newptr = line_calloc(newsiz);`
123	`if (newptr == NULL) return(-1);`	123	`if (newptr == NULL) return(-1);`
124	`_fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);`	124	`_fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);`
125		125
126	`/* rewire the linked list */`	126	`/* rewire the linked list */`
127	`db->cursor = newptr;`	127	`db->cursor = newptr;`
128	`if (newptr->next) newptr->next->prev = newptr;`	128	`if (newptr->next) newptr->next->prev = newptr;`
129	`if (newptr->prev) newptr->prev->next = newptr;`	129	`if (newptr->prev) newptr->prev->next = newptr;`
130		130
131	`return(0);`	131	`return(0);`
132	`}`	132	`}`
133		133
134		134
135	`/* adds a new line at cursor position into file linked list and advance cursor`	135	`/* adds a new line at cursor position into file linked list and advance cursor`
136	`* returns non-zero on error */`	136	`* returns non-zero on error */`
137	`static int line_add(struct file db, const char far line, unsigned short slen) {`	137	`static int line_add(struct file db, const char far line, unsigned short slen) {`
138	`struct line far *l;`	138	`struct line far *l;`
139		139
140	`l = line_calloc(slen);`	140	`l = line_calloc(slen);`
141	`if (l == NULL) return(-1);`	141	`if (l == NULL) return(-1);`
142		142
143	`l->prev = db->cursor;`	143	`l->prev = db->cursor;`
144	`if (db->cursor) {`	144	`if (db->cursor) {`
145	`l->next = db->cursor->next;`	145	`l->next = db->cursor->next;`
146	`db->cursor->next = l;`	146	`db->cursor->next = l;`
147	`l->next->prev = l;`	147	`l->next->prev = l;`
148	`}`	148	`}`
149	`db->cursor = l;`	149	`db->cursor = l;`
150	`if (slen > 0) {`	150	`if (slen > 0) {`
151	`_fmemmove(l->payload, line, slen);`	151	`_fmemmove(l->payload, line, slen);`
152	`l->len = slen;`	152	`l->len = slen;`
153	`}`	153	`}`
154		154
155	`db->totlines += 1;`	155	`db->totlines += 1;`
156	`db->curline += 1;`	156	`db->curline += 1;`
157		157
158	`return(0);`	158	`return(0);`
159	`}`	159	`}`
160		160
161		161
162	`static void ui_getstring(const char query, char s, unsigned short maxlen) {`	162	`static void ui_getstring(const char query, char s, unsigned short maxlen) {`
163	`unsigned short len = 0;`	163	`unsigned short len = 0;`
164	`unsigned char y, x;`	164	`unsigned char y, x;`
165	`int k;`	165	`int k;`
166		166
167	`if (maxlen == 0) return;`	167	`if (maxlen == 0) return;`
168	`maxlen--; /* make room for the nul terminator */`	168	`maxlen--; /* make room for the nul terminator */`
169		169
170	`y = screenlastrow;`	170	`y = screenlastrow;`
171		171
172	`/* print query string */`	172	`/* print query string */`
173	`x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);`	173	`x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);`
174	`mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);`	174	`mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);`
175		175
176	`for (;;) {`	176	`for (;;) {`
177	`mdr_cout_locate(y, x + len);`	177	`mdr_cout_locate(y, x + len);`
178	`k = mdr_dos_getkey2();`	178	`k = mdr_dos_getkey2();`
179		179
180	`switch (k) {`	180	`switch (k) {`
181	`case 0x1b: /* ESC */`	181	`case 0x1b: /* ESC */`
182	`s[0] = 0;`	182	`s[0] = 0;`
183	`return;`	183	`return;`
184	`case '\r':`	184	`case '\r':`
185	`s[len] = 0;`	185	`s[len] = 0;`
186	`return;`	186	`return;`
187	`case 0x08: /* BKSPC */`	187	`case 0x08: /* BKSPC */`
188	`if (len > 0) {`	188	`if (len > 0) {`
189	`len--;`	189	`len--;`
190	`mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);`	190	`mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);`
191	`}`	191	`}`
192	`break;`	192	`break;`
193	`default:`	193	`default:`
194	`if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {`	194	`if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {`
195	`mdr_cout_char(y, x + len, k, SCHEME_STBAR3);`	195	`mdr_cout_char(y, x + len, k, SCHEME_STBAR3);`
196	`s[len++] = k;`	196	`s[len++] = k;`
197	`}`	197	`}`
198	`}`	198	`}`
199	`}`	199	`}`
200		200
201	`}`	201	`}`
202		202
203		203
204	`/* append a nul-terminated string to line at cursor position */`	204	`/* append a nul-terminated string to line at cursor position */`
205	`static int line_append(struct file f, const char far buf, unsigned short len) {`	205	`static int line_append(struct file f, const char far buf, unsigned short len) {`
206	`if (sizeof(struct line) + f->cursor->len + len < len) goto ERR; /* overflow check */`	206	`if (sizeof(struct line) + f->cursor->len + len < len) goto ERR; /* overflow check */`
207	`if (curline_resize(f, f->cursor->len + len) != 0) goto ERR;`	207	`if (curline_resize(f, f->cursor->len + len) != 0) goto ERR;`
208		208
209	`_fmemmove(f->cursor->payload + f->cursor->len, buf, len);`	209	`_fmemmove(f->cursor->payload + f->cursor->len, buf, len);`
210	`f->cursor->len += len;`	210	`f->cursor->len += len;`
211		211
212	`return(0);`	212	`return(0);`
213	`ERR:`	213	`ERR:`
214	`return(-1);`	214	`return(-1);`
215	`}`	215	`}`
216		216
217		217
218	`static void db_rewind(struct file *db) {`	218	`static void db_rewind(struct file *db) {`
219	`if (db->cursor == NULL) return;`	219	`if (db->cursor == NULL) return;`
220	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	220	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
221	`db->curline = 0;`	221	`db->curline = 0;`
222	`}`	222	`}`
223		223
224		224
225	`/* saves db file, resets db->modflag on success and overwrites the filename`	225	`/* saves db file, resets db->modflag on success and overwrites the filename`
226	`* field if saveas is not NULL */`	226	`* field if saveas is not NULL */`
227	`static int savefile(struct file db, const char saveas) {`	227	`static int savefile(struct file db, const char saveas) {`
228	`int fd = 0;`	228	`int fd = 0;`
229	`const struct line far *l;`	229	`const struct line far *l;`
230	`unsigned int bytes;`	230	`unsigned int bytes;`
231	`unsigned char eollen = 2;`	231	`unsigned char eollen = 2;`
232	`const unsigned char *eolbuf = "\r\n";`	232	`const unsigned char *eolbuf = "\r\n";`
233	`int errflag = 0;`	233	`int errflag = 0;`
234		234
235	`/* if filename not overloaded then use the fname in db */`	235	`/* if filename not overloaded then use the fname in db */`
236	`if (saveas == NULL) saveas = db->fname;`	236	`if (saveas == NULL) saveas = db->fname;`
237		237
238	`_asm {`	238	`_asm {`
239	`push ax`	239	`push ax`
240	`push cx`	240	`push cx`
241	`push dx`	241	`push dx`
242		242
243	`mov ah, 0x3C /* create or truncate file */`	243	`mov ah, 0x3C /* create or truncate file */`
244	`xor cx, cx /* file attributes */`	244	`xor cx, cx /* file attributes */`
245	`mov dx, saveas /* works only in SMALL/TINY mode */`	245	`mov dx, saveas /* works only in SMALL/TINY mode */`
246	`int 0x21`	246	`int 0x21`
247	`jnc DONE`	247	`jnc DONE`
248	`mov errflag, ax`	248	`mov errflag, ax`
249	`DONE:`	249	`DONE:`
250	`mov fd, ax`	250	`mov fd, ax`
251		251
252	`pop dx`	252	`pop dx`
253	`pop cx`	253	`pop cx`
254	`pop ax`	254	`pop ax`
255	`}`	255	`}`
256		256
257	`if (errflag != 0) return(-1);`	257	`if (errflag != 0) return(-1);`
258		258
259	`l = db->cursor;`	259	`l = db->cursor;`
260	`while (l->prev) l = l->prev;`	260	`while (l->prev) l = l->prev;`
261		261
262	`/* preset line terminators */`	262	`/* preset line terminators */`
263	`if (db->lfonly) {`	263	`if (db->lfonly) {`
264	`eolbuf++;`	264	`eolbuf++;`
265	`eollen--;`	265	`eollen--;`
266	`}`	266	`}`
267		267
268	`while (l) {`	268	`while (l) {`
269	`/* do not write the last empty line, it is only useful for edition */`	269	`/* do not write the last empty line, it is only useful for edition */`
270	`if (l->len != 0) {`	270	`if (l->len != 0) {`
271	`errflag \|= _dos_write(fd, l->payload, l->len, &bytes);`	271	`errflag \|= _dos_write(fd, l->payload, l->len, &bytes);`
272	`} else if (l->next == NULL) {`	272	`} else if (l->next == NULL) {`
273	`break;`	273	`break;`
274	`}`	274	`}`
275	`errflag \|= _dos_write(fd, eolbuf, eollen, &bytes);`	275	`errflag \|= _dos_write(fd, eolbuf, eollen, &bytes);`
276	`l = l->next;`	276	`l = l->next;`
277	`}`	277	`}`
278		278
279	`errflag \|= _dos_close(fd);`	279	`errflag \|= _dos_close(fd);`
280		280
281	`/* did it all work? */`	281	`/* did it all work? */`
282	`if (errflag == 0) {`	282	`if (errflag == 0) {`
283	`db->modflag = 0;`	283	`db->modflag = 0;`
284	`if (saveas != db->fname) mdr_dos_truename(db->fname, saveas);`	284	`if (saveas != db->fname) mdr_dos_truename(db->fname, saveas);`
285	`}`	285	`}`
286		286
287	`return(errflag);`	287	`return(errflag);`
288	`}`	288	`}`
289		289
290		290
291	`static void ui_statusbar(const struct file *db, unsigned char slotnum) {`	291	`static void ui_statusbar(const struct file *db, unsigned char slotnum) {`
292	`const char s = svarlang_strid(0); / ESC=MENU */`	292	`const char s = svarlang_strid(0); / ESC=MENU */`
293	`unsigned short helpcol = screenw - strlen(s);`	293	`unsigned short helpcol = screenw - strlen(s);`
294	`unsigned short col;`	294	`unsigned short col;`
295		295
296	`/* slot number (guaranteed to be 0-9) */`	296	`/* slot number (guaranteed to be 0-9) */`
297	`{`	297	`{`
298	`char slot[4] = "#00";`	298	`char slot[4] = "#00";`
299	`if (slotnum == 9) {`	299	`if (slotnum == 9) {`
300	`slot[1] = '1';`	300	`slot[1] = '1';`
301	`} else {`	301	`} else {`
302	`slotnum++;`	302	`slotnum++;`
303	`slot[2] += slotnum;`	303	`slot[2] += slotnum;`
304	`}`	304	`}`
305	`mdr_cout_str(screenlastrow, 0, slot, SCHEME_STBAR2, 3);`	305	`mdr_cout_str(screenlastrow, 0, slot, SCHEME_STBAR2, 3);`
306	`}`	306	`}`
307		307
308	`/* fill rest of status bar with background */`	308	`/* fill rest of status bar with background */`
309	`mdr_cout_char_rep(screenlastrow, 3, ' ', SCHEME_STBAR1, helpcol - 3);`	309	`mdr_cout_char_rep(screenlastrow, 3, ' ', SCHEME_STBAR1, helpcol - 3);`
310		310
311	`/* eol type */`	311	`/* eol type */`
312	`{`	312	`{`
313	`const char *eoltype = "CRLF";`	313	`const char *eoltype = "CRLF";`
314	`if (db->lfonly) eoltype += 2;`	314	`if (db->lfonly) eoltype += 2;`
315	`mdr_cout_str(screenlastrow, helpcol - 5, eoltype, SCHEME_STBAR1, 5);`	315	`mdr_cout_str(screenlastrow, helpcol - 5, eoltype, SCHEME_STBAR1, 5);`
316	`}`	316	`}`
317		317
318	`/* line numbers */`	318	`/* line numbers */`
319	`{`	319	`{`
320	`unsigned short x;`	320	`unsigned short x;`
321	`unsigned char count = 0;`	321	`unsigned char count = 0;`
322	`col = helpcol - 7;`	322	`col = helpcol - 7;`
323		323
324	`x = db->totlines;`	324	`x = db->totlines;`
325	`AGAIN:`	325	`AGAIN:`
326	`do {`	326	`do {`
327	`mdr_cout_char(screenlastrow, col--, '0' + (x % 10), SCHEME_STBAR1);`	327	`mdr_cout_char(screenlastrow, col--, '0' + (x % 10), SCHEME_STBAR1);`
328	`x /= 10;`	328	`x /= 10;`
329	`} while (x);`	329	`} while (x);`
330	`/* redo same exercise, but printing the current line now */`	330	`/* redo same exercise, but printing the current line now */`
331	`if (count == 0) {`	331	`if (count == 0) {`
332	`count = 1;`	332	`count = 1;`
333	`mdr_cout_char(screenlastrow, col--, '/', SCHEME_STBAR1);`	333	`mdr_cout_char(screenlastrow, col--, '/', SCHEME_STBAR1);`
334	`x = 1 + db->curline;`	334	`x = 1 + db->curline;`
335	`goto AGAIN;`	335	`goto AGAIN;`
336	`}`	336	`}`
337	`}`	337	`}`
338		338
339	`/* filename and modflag */`	339	`/* filename and modflag */`
340	`{`	340	`{`
341	`const char *fn;`	341	`const char *fn;`
342	`unsigned short x;`	342	`unsigned short x;`
343	`unsigned short maxfnlen = col - 6;`	343	`unsigned short maxfnlen = col - 6;`
344	`if (db->fname[0] == 0) {`	344	`if (db->fname[0] == 0) {`
345	`fn = svarlang_str(0, 1); /* "UNTITLED" */`	345	`fn = svarlang_str(0, 1); /* "UNTITLED" */`
346	`} else {`	346	`} else {`
347	`/* display filename up to maxfnlen chars */`	347	`/* display filename up to maxfnlen chars */`
348	`fn = db->fname;`	348	`fn = db->fname;`
349	`x = strlen(fn);`	349	`x = strlen(fn);`
350	`if (x > maxfnlen) fn += x - maxfnlen;`	350	`if (x > maxfnlen) fn += x - maxfnlen;`
351	`}`	351	`}`
352	`x = mdr_cout_str(screenlastrow, 4, fn, SCHEME_STBAR1, maxfnlen);`	352	`x = mdr_cout_str(screenlastrow, 4, fn, SCHEME_STBAR1, maxfnlen);`
353	`if (db->modflag) mdr_cout_char(screenlastrow, 5 + x, '!', SCHEME_STBAR2);`	353	`if (db->modflag) mdr_cout_char(screenlastrow, 5 + x, '!', SCHEME_STBAR2);`
354	`}`	354	`}`
355		355
356	`mdr_cout_str(screenlastrow, helpcol, s, SCHEME_STBAR2, 40);`	356	`mdr_cout_str(screenlastrow, helpcol, s, SCHEME_STBAR2, 40);`
357	`}`	357	`}`
358		358
359		359
360	`static void ui_msg(const char msg1, const char msg2, unsigned char attr) {`	360	`static void ui_msg(const char msg1, const char msg2, unsigned char attr) {`
361	`unsigned short x, y, msglen, i;`	361	`unsigned short x, y, msglen, i;`
362	`unsigned short msg2flag = 0;`	362	`unsigned short msg2flag = 0;`
363		363
364	`msglen = strlen(msg1);`	364	`msglen = strlen(msg1);`
365	`if (msg2) {`	365	`if (msg2) {`
366	`msg2flag = 1;`	366	`msg2flag = 1;`
367	`i = strlen(msg2);`	367	`i = strlen(msg2);`
368	`if (i > msglen) msglen = i;`	368	`if (i > msglen) msglen = i;`
369	`}`	369	`}`
370		370
371	`y = (screenh - 6) >> 1;`	371	`y = (screenh - 6) >> 1;`
372	`x = (screenw - msglen - 3) >> 1;`	372	`x = (screenw - msglen - 3) >> 1;`
373	`for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`	373	`for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`
374	`x++;`	374	`x++;`
375		375
376	`mdr_cout_str(y+1, x, msg1, attr, msglen);`	376	`mdr_cout_str(y+1, x, msg1, attr, msglen);`
377	`if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);`	377	`if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);`
378		378
379	`if (uidirty.from > y) uidirty.from = y;`	379	`if (uidirty.from > y) uidirty.from = y;`
380	`if (uidirty.to < y+4) uidirty.to = y+4;`	380	`if (uidirty.to < y+4) uidirty.to = y+4;`
381	`}`	381	`}`
382		382
383		383
384	`/* returns 0 if operation may proceed, non-zero to cancel */`	384	`/* returns 0 if operation may proceed, non-zero to cancel */`
385	`static unsigned char ui_confirm_if_unsaved(struct file *db) {`	385	`static unsigned char ui_confirm_if_unsaved(struct file *db) {`
386	`int k;`	386	`int k;`
387		387
388	`if (db->modflag == 0) return(0);`	388	`if (db->modflag == 0) return(0);`
389		389
390	`mdr_cout_cursor_hide();`	390	`mdr_cout_cursor_hide();`
391		391
392	`/* if file has been modified then ask for confirmation:`	392	`/* if file has been modified then ask for confirmation:`
393	`* ENTER : agree to data loss`	393	`* ENTER : agree to data loss`
394	`* SPACE : SAVE file before quit (only if valid filename present)`	394	`* SPACE : SAVE file before quit (only if valid filename present)`
395	`* anything else: ABORT */`	395	`* anything else: ABORT */`
396	`ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);`	396	`ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);`
397		397
398	`k = mdr_dos_getkey2();`	398	`k = mdr_dos_getkey2();`
399	`mdr_cout_cursor_show();`	399	`mdr_cout_cursor_show();`
400		400
401	`/* ENTER = agree to loose unsaved data */`	401	`/* ENTER = agree to loose unsaved data */`
402	`if (k == '\r') return(0);`	402	`if (k == '\r') return(0);`
403		403
404	`/* SPACE = save file and continue */`	404	`/* SPACE = save file and continue */`
405	`if ((k == ' ') && (db->fname[0] != 0) && (savefile(db, NULL) == 0)) return(0);`	405	`if ((k == ' ') && (db->fname[0] != 0) && (savefile(db, NULL) == 0)) return(0);`
406		406
407	`/* any other key = cancel operation */`	407	`/* any other key = cancel operation */`
408	`return(1);`	408	`return(1);`
409	`}`	409	`}`
410		410
411		411
412	`static void ui_refresh(const struct file *db) {`	412	`static void ui_refresh(const struct file *db) {`
413	`unsigned char x;`	413	`unsigned char x;`
414	`const struct line far *l;`	414	`const struct line far *l;`
415	`unsigned char y = db->cursorposy;`	415	`unsigned char y = db->cursorposy;`
416		416
417	`/* quit early if nothing to refresh */`	417	`/* quit early if nothing to refresh */`
418	`if (uidirty.from == 0xff) return;`	418	`if (uidirty.from == 0xff) return;`
419		419
420	`#ifdef DBG_REFRESH`	420	`#ifdef DBG_REFRESH`
421	`static char m = 'a';`	421	`static char m = 'a';`
422	`m++;`	422	`m++;`
423	`if (m > 'z') m = 'a';`	423	`if (m > 'z') m = 'a';`
424	`#endif`	424	`#endif`
425		425
426	`/* rewind cursor line to first line that needs redrawing */`	426	`/* rewind cursor line to first line that needs redrawing */`
427	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`	427	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`
428		428
429	`/* iterate over lines and redraw whatever needs to be redrawn */`	429	`/* iterate over lines and redraw whatever needs to be redrawn */`
430	`for (; l != NULL; l = l->next, y++) {`	430	`for (; l != NULL; l = l->next, y++) {`
431		431
432	`/* skip lines that do not need to be refreshed */`	432	`/* skip lines that do not need to be refreshed */`
433	`if (y < uidirty.from) continue;`	433	`if (y < uidirty.from) continue;`
434	`if (y > uidirty.to) break;`	434	`if (y > uidirty.to) break;`
435		435
436	`x = 0;`	436	`x = 0;`
437	`if (db->xoffset < l->len) {`	437	`if (db->xoffset < l->len) {`
438	`unsigned char i, limit;`	438	`unsigned char i, limit;`
439	`if (l->len - db->xoffset < screenw) {`	439	`if (l->len - db->xoffset < screenw) {`
440	`limit = l->len;`	440	`limit = l->len;`
441	`} else {`	441	`} else {`
442	`limit = db->xoffset + screenlastcol;`	442	`limit = db->xoffset + screenlastcol;`
443	`}`	443	`}`
444	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);`	444	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);`
445	`}`	445	`}`
446		446
447	`/* write empty spaces until end of line */`	447	`/* write empty spaces until end of line */`
448	`if (x < screenlastcol) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenlastcol - x);`	448	`if (x < screenlastcol) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenlastcol - x);`
449		449
450	`#ifdef DBG_REFRESH`	450	`#ifdef DBG_REFRESH`
451	`mdr_cout_char(y, 0, m, SCHEME_STBAR1);`	451	`mdr_cout_char(y, 0, m, SCHEME_STBAR1);`
452	`#endif`	452	`#endif`
453		453
454	`if (y == screenh - 2) break;`	454	`if (y == screenh - 2) break;`
455	`}`	455	`}`
456		456
457	`/* fill all lines below if empty (and they need to be redrawn) */`	457	`/* fill all lines below if empty (and they need to be redrawn) */`
458	`if (l == NULL) {`	458	`if (l == NULL) {`
459	`while ((y < screenlastrow) && (y < uidirty.to)) {`	459	`while ((y < screenlastrow) && (y < uidirty.to)) {`
460	`mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenlastcol);`	460	`mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenlastcol);`
461	`}`	461	`}`
462	`}`	462	`}`
463		463
464	`/* scroll bar */`	464	`/* scroll bar */`
465	`for (y = 0; y < screenlastrow; y++) {`	465	`for (y = 0; y < screenlastrow; y++) {`
466	`mdr_cout_char(y, screenlastcol, SCROLL_CURSOR, SCHEME_SCROLL);`	466	`mdr_cout_char(y, screenlastcol, SCROLL_CURSOR, SCHEME_SCROLL);`
467	`}`	467	`}`
468		468
469	`/* scroll cursor */`	469	`/* scroll cursor */`
470	`if (db->totlines >= screenh) {`	470	`if (db->totlines >= screenh) {`
471	`unsigned short topline = db->curline - db->cursorposy;`	471	`unsigned short topline = db->curline - db->cursorposy;`
472	`unsigned short col;`	472	`unsigned short col;`
473	`unsigned short totlines = db->totlines - screenh + 1;`	473	`unsigned short totlines = db->totlines - screenh + 1;`
474	`if (db->totlines - screenh > screenh) {`	474	`if (db->totlines - screenh > screenh) {`
475	`col = topline / (totlines / screenlastrow);`	475	`col = topline / (totlines / screenlastrow);`
476	`} else {`	476	`} else {`
477	`col = topline * screenlastrow / totlines;`	477	`col = topline * screenlastrow / totlines;`
478	`}`	478	`}`
479	`if (col >= screenlastrow) col = screenh - 2;`	479	`if (col >= screenlastrow) col = screenh - 2;`
480	`mdr_cout_char(col, screenlastcol, ' ', SCHEME_SCROLL);`	480	`mdr_cout_char(col, screenlastcol, ' ', SCHEME_SCROLL);`
481	`}`	481	`}`
482		482
483	`/* clear out the dirty flag */`	483	`/* clear out the dirty flag */`
484	`uidirty.from = 0xff;`	484	`uidirty.from = 0xff;`
485	`}`	485	`}`
486		486
487		487
488	`static void check_cursor_not_after_eol(struct file *db) {`	488	`static void check_cursor_not_after_eol(struct file *db) {`
489	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	489	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
490		490
491	`if (db->cursor->len < db->xoffset) {`	491	`if (db->cursor->len < db->xoffset) {`
492	`db->cursorposx = 0;`	492	`db->cursorposx = 0;`
493	`db->xoffset = db->cursor->len;`	493	`db->xoffset = db->cursor->len;`
494	`uidirty.from = 0;`	494	`uidirty.from = 0;`
495	`uidirty.to = 0xff;`	495	`uidirty.to = 0xff;`
496	`} else {`	496	`} else {`
497	`db->cursorposx = db->cursor->len - db->xoffset;`	497	`db->cursorposx = db->cursor->len - db->xoffset;`
498	`}`	498	`}`
499	`}`	499	`}`
500		500

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1577 – Rev 1541 → 1543