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 <string.h>
 
#include "mdr\bios.h"
#include "mdr\cout.h"
#include "mdr\dos.h"
#include "mdr\keyb.h"
 
#include "svarlang\svarlang.h"
 
 
/*****************************************************************************
 * global variables and definitions                                          *
 *****************************************************************************/
 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
static unsigned char SCHEME_TEXT   = 0x07,
                     SCHEME_STBAR1 = 0x70,
                     SCHEME_STBAR2 = 0x70,
                     SCHEME_STBAR3 = 0xf0,
                     SCHEME_SCROLL = 0x70,
                     SCHEME_MSG    = 0x70,
                     SCHEME_ERR    = 0xf0;
 
static unsigned char screenw, screenh;
 
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 {
  struct line far *prev;
  struct line far *next;
  unsigned short len;
  char payload[1];
};
 
struct file {
  struct line far *cursor;
  unsigned short xoffset;
  unsigned short cursorposx;
  unsigned short cursorposy;
  unsigned short totlines;
  unsigned short curline;
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
  char modflag;  /* non-zero if file has been modified since last save */
  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);
  _fmemset(res, 0, sizeof(struct line) + siz);
  return(MK_FP(seg, 0));
}
 
 
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 = screenh - 1;
 
  /* 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 = keyb_getkey();
 
    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) return(-1); /* overflow check */
  if (curline_resize(f, f->cursor->len + len) != 0) return(-1);
  _fmemmove(f->cursor->payload + f->cursor->len, buf, len);
  f->cursor->len += len;
 
  return(0);
}
 
 
static void db_rewind(struct file *db) {
  if (db->cursor == NULL) return;
  while (db->cursor->prev) db->cursor = db->cursor->prev;
  db->curline = 0;
}
 
 
static void ui_basic(const struct file *db) {
  const char *s = svarlang_strid(0); /* HELP */
  unsigned short helpcol = screenw - strlen(s);
 
  /* fill status bar with background (without modflag as it is refreshed by ui_refresh) */
  mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);
 
  /* filename */
  {
    const char *fn = db->fname;
    if (*fn == 0) fn = svarlang_str(0, 1);
    mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);
  }
 
  /* eol type */
  {
    const char *eoltype = "CRLF";
    if (db->lfonly) eoltype += 2;
    mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);
  }
 
  mdr_cout_str(screenh - 1, 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 char msg2flag = 0;
 
  msglen = strlen(msg1);
  if (msg2) {
    msg2flag = 1;
    i = strlen(msg2);
    if (i > msglen) msglen = i;
  }
 
  y = (screenh - 6) >> 1;
  x = (screenw - msglen - 4) >> 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;
}
 
 
static unsigned char ui_confirm_if_unsaved(struct file *db) {
  if (db->modflag == 0) return(0);
 
  /* if file has been modified then ask for confirmation */
  ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);
  if (keyb_getkey() == '\r') return(0);
 
  return(1);
}
 
 
static void ui_help(void) {
#define MAXLINLEN 39
  unsigned short i, offset;
  offset = (screenw - MAXLINLEN) >> 1;
 
  for (i = 3; i < 25; i++) {
    const char *s = svarlang_str(8, i);
    if (s[0] == 0) break;
    mdr_cout_char_rep(i, offset, ' ', SCHEME_STBAR1, MAXLINLEN);
    if (s[0] == '.') continue;
    mdr_cout_locate(i, offset + 2 + mdr_cout_str(i, offset + 2, s, SCHEME_STBAR1, MAXLINLEN - 2));
  }
 
  keyb_getkey();
#undef MAXLINLEN
}
 
 
static void ui_refresh(const struct file *db) {
  unsigned char x;
  const struct line far *l;
  unsigned char y = db->cursorposy;
 
#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 + screenw - 1;
      }
      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 < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - 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 < screenh - 1) && (y < uidirty.to)) {
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);
    }
  }
 
  /* "file changed" flag */
  mdr_cout_char(screenh - 1, 0, db->modflag, SCHEME_STBAR1);
 
  /* scroll bar */
  for (y = 0; y < (screenh - 1); y++) {
    mdr_cout_char(y, screenw - 1, 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 / (screenh - 1));
    } else {
      col = topline * (screenh - 1) / totlines;
    }
    if (col >= screenh - 1) col = screenh - 2;
    mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);
  }
}
 
 
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) {
    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 + screenw - 1 <= 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) {
    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 {
    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 = '*';
  } 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 = '*';
  }
}
 
 
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 == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
 
  cursor_left(db);
  del(db);
}
 
 
/* 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 const char *parseargv(void) {
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
  unsigned short count = 0;
  char *argv[2];
 
  while (count < 2) {
    /* 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 == 0) return("");
  if (count == 1) return(argv[0]);
 
  return(NULL);
}
 
 
/* 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;
 
  bzero(db, sizeof(db));
  memcpy(db->fname, fname, strlen(fname));
 
  if (*fname == 0) goto SKIPLOADING;
 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
    return(1);
  }
 
  db->lfonly = 1;
 
  /* start by adding an empty line */
  if (line_add(db, NULL, 0) != 0) {
    /* TODO ERROR HANDLING */
  }
 
  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 */
    for (consumedbytes = 0;; consumedbytes++) {
      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;
    }
 
    /* add a new line if necessary */
    if (eolfound) {
      if (line_add(db, NULL, 0) != 0) {
        goto IOERR;
      }
      eolfound = 0;
    }
 
    /* anything left? process the buffer leftover again */
    if (consumedbytes < len) {
      len -= consumedbytes;
      buffptr += consumedbytes;
      goto FINDLINE;
    }
 
  }
 
  _dos_close(fd);
 
  SKIPLOADING:
 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
  if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
  db_rewind(db);
 
  return(0);
 
  IOERR:
  _dos_close(fd);
  return(2);
}
 
 
static int savefile(const struct file *db, const char *newfname) {
  int fd;
  const struct line far *l;
  unsigned bytes;
  unsigned char eollen;
  unsigned char eolbuf[2];
  int errflag = 0;
 
  /* either create a new file if newfname provided, or... */
  if (newfname) {
    if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
  } else { /* ...open db->fname */
    if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
  }
 
  l = db->cursor;
  while (l->prev) l = l->prev;
 
  /* preset line terminators */
  if (db->lfonly) {
    eolbuf[0] = '\n';
    eollen = 1;
  } else {
    eolbuf[0] = '\r';
    eolbuf[1] = '\n';
    eollen = 2;
  }
 
  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);
 
  return(errflag);
}
 
 
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 = '*';
    _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);
    }
  }
}
 
 
static void clear_file(struct file *db) {
 
  /* 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));
}
 
 
/* 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;
  }
}
 
 
/* 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[1];
  const char *fname;
  struct file *db = dbarr;
 
  {
    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) || (*fname == '/')) {
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
    return;
  }
 
  /* load file */
  {
    unsigned char err = loadfile(db, fname);
    if (err == 1) {
      mdr_coutraw_puts(svarlang_str(0,11)); /* file not found */
      return;
    } else if (err != 0) {
      mdr_coutraw_puts(svarlang_str(0,10)); /* ERROR */
      return;
    }
  }
 
  if (mdr_cout_init(&screenw, &screenh)) {
    /* load color scheme if mdr_cout_init returns a color flag */
    SCHEME_TEXT = 0x17;
    SCHEME_STBAR1 = 0x70;
    SCHEME_STBAR2 = 0x78;
    SCHEME_STBAR3 = 0xf0;
    SCHEME_SCROLL = 0x70;
    SCHEME_MSG = 0xf0;
    SCHEME_ERR = 0x4f;
  }
 
  for (;;) {
    int k;
 
    check_cursor_not_after_eol(db);
    mdr_cout_locate(db->cursorposy, db->cursorposx);
 
    if (uidirty.from != 0xff) {
      ui_refresh(db);
      uidirty.from = 0xff;
    }
    if (uidirty.statusbar) {
      ui_basic(db);
      uidirty.statusbar = 0;
    }
#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 = keyb_getkey();
 
    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 */
      if (ui_confirm_if_unsaved(db) == 0) 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 = '*';
        db->cursor = db->cursor->prev; /* back to original line */
        /* trim the line above */
        db->cursor->len = off;
        /* move cursor to the (new) line below */
        db->curline -= 1;
        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 */
      insert_in_line(db, "        ", 8);
 
    } else if (k == 0x13b) { /* F1 */
      ui_help();
      uidirty.from = 0;
      uidirty.to = 0xff;
 
    } else if (k == 0x13c) { /* F2 (new file) */
      if (ui_confirm_if_unsaved(db) == 0) {
        clear_file(db);
        /* add a single empty line */
        line_add(db, NULL, 0);
      }
      uidirty.from = 0;
      uidirty.to = 0xff;
      uidirty.statusbar = 1;
 
    } else if (k == 0x13d) { /* F3 (load file) */
      char fname[25];
 
      /* 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;
        clear_file(db);
        err = loadfile(db, fname);
        if (err != 0) {
          if (err == 1) {
            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 */
          clear_file(db);
        }
      }
      uidirty.from = 0;
      uidirty.to = 0xff;
      uidirty.statusbar = 1;
 
    } else if ((k == 0x13f) || (k == 0x140)) { /* F5 or F6 */
      int saveres;
 
      if ((k == 0x140) || (db->fname[0] == 0)) { /* save as... */
        char fname[25];
        ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
        if (*fname == 0) continue;
        saveres = savefile(db, fname);
        if (saveres == 0) memcpy(db->fname, fname, sizeof(fname));
      } else {
        saveres = savefile(db, NULL);
      }
 
      if (saveres == 0) {
        db->modflag = 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, 3), NULL, SCHEME_ERR);
        mdr_bios_tickswait(36); /* 2s */
      }
 
      ui_refresh(db);
      uidirty.statusbar = 1;
 
    } else if (k == 0x144) { /* F10 */
      db->modflag = '*';
      db->lfonly ^= 1;
      uidirty.statusbar = 1;
      uidirty.from = 0;
      uidirty.to = 0;
 
    } 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;
      }
 
#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);
      keyb_getkey();
      break;
#endif
    }
  }
 
  mdr_cout_close();
 
  /* no need to free memory, DOS will do it for me */
 
  return;
}
 

Rev 1352	Rev 1353
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 <string.h>`	28	`#include <string.h>`
29		29
30	`#include "mdr\bios.h"`	30	`#include "mdr\bios.h"`
31	`#include "mdr\cout.h"`	31	`#include "mdr\cout.h"`
32	`#include "mdr\dos.h"`	32	`#include "mdr\dos.h"`
33	`#include "mdr\keyb.h"`	33	`#include "mdr\keyb.h"`
34		34
35	`#include "svarlang\svarlang.h"`	35	`#include "svarlang\svarlang.h"`
36		36
37		37
38	`/*****************************************************************************`	38	`/*****************************************************************************`
39	`* global variables and definitions *`	39	`* global variables and definitions *`
40	`*****************************************************************************/`	40	`*****************************************************************************/`
41		41
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_TEXT = 0x07,`	43	`static unsigned char SCHEME_TEXT = 0x07,`
44	`SCHEME_STBAR1 = 0x70,`	44	`SCHEME_STBAR1 = 0x70,`
45	`SCHEME_STBAR2 = 0x70,`	45	`SCHEME_STBAR2 = 0x70,`
46	`SCHEME_STBAR3 = 0xf0,`	46	`SCHEME_STBAR3 = 0xf0,`
47	`SCHEME_SCROLL = 0x70,`	47	`SCHEME_SCROLL = 0x70,`
48	`SCHEME_MSG = 0x70,`	48	`SCHEME_MSG = 0x70,`
49	`SCHEME_ERR = 0xf0;`	49	`SCHEME_ERR = 0xf0;`
50		50
51	`static unsigned char screenw, screenh;`	51	`static unsigned char screenw, screenh;`
52		52
53	`static struct {`	53	`static struct {`
54	`unsigned char from;`	54	`unsigned char from;`
55	`unsigned char to;`	55	`unsigned char to;`
56	`unsigned char statusbar;`	56	`unsigned char statusbar;`
57	`} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */`	57	`} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */`
58		58
59	`#define SCROLL_CURSOR 0xB1`	59	`#define SCROLL_CURSOR 0xB1`
60		60
61	`struct line {`	61	`struct line {`
62	`struct line far *prev;`	62	`struct line far *prev;`
63	`struct line far *next;`	63	`struct line far *next;`
64	`unsigned short len;`	64	`unsigned short len;`
65	`char payload[1];`	65	`char payload[1];`
66	`};`	66	`};`
67		67
68	`struct file {`	68	`struct file {`
69	`struct line far *cursor;`	69	`struct line far *cursor;`
70	`unsigned short xoffset;`	70	`unsigned short xoffset;`
71	`unsigned short cursorposx;`	71	`unsigned short cursorposx;`
72	`unsigned short cursorposy;`	72	`unsigned short cursorposy;`
73	`unsigned short totlines;`	73	`unsigned short totlines;`
74	`unsigned short curline;`	74	`unsigned short curline;`
75	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`	75	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`
76	`char modflag; /* non-zero if file has been modified since last save */`	76	`char modflag; /* non-zero if file has been modified since last save */`
77	`char fname[128];`	77	`char fname[128];`
78	`};`	78	`};`
79		79
80		80
81	`/*****************************************************************************`	81	`/*****************************************************************************`
82	`* functions *`	82	`* functions *`
83	`*****************************************************************************/`	83	`*****************************************************************************/`
84		84
85	`static struct line far *line_calloc(unsigned short siz) {`	85	`static struct line far *line_calloc(unsigned short siz) {`
86	`struct line far *res;`	86	`struct line far *res;`
87	`unsigned int seg;`	87	`unsigned int seg;`
88	`if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);`	88	`if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);`
89	`res = MK_FP(seg, 0);`	89	`res = MK_FP(seg, 0);`
90	`_fmemset(res, 0, sizeof(struct line) + siz);`	90	`_fmemset(res, 0, sizeof(struct line) + siz);`
91	`return(MK_FP(seg, 0));`	91	`return(MK_FP(seg, 0));`
92	`}`	92	`}`
93		93
94		94
95	`static void line_free(struct line far *ptr) {`	95	`static void line_free(struct line far *ptr) {`
96	`_dos_freemem(FP_SEG(ptr));`	96	`_dos_freemem(FP_SEG(ptr));`
97	`}`	97	`}`
98		98
99		99
100	`static int curline_resize(struct file far *db, unsigned short newsiz) {`	100	`static int curline_resize(struct file far *db, unsigned short newsiz) {`
101	`unsigned int maxavail;`	101	`unsigned int maxavail;`
102	`struct line far *newptr;`	102	`struct line far *newptr;`
103		103
104	`/* try resizing the block (much faster) */`	104	`/* try resizing the block (much faster) */`
105	`if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);`	105	`if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);`
106		106
107	`/* create a new block and copy data over */`	107	`/* create a new block and copy data over */`
108	`newptr = line_calloc(newsiz);`	108	`newptr = line_calloc(newsiz);`
109	`if (newptr == NULL) return(-1);`	109	`if (newptr == NULL) return(-1);`
110	`_fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);`	110	`_fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);`
111		111
112	`/* rewire the linked list */`	112	`/* rewire the linked list */`
113	`db->cursor = newptr;`	113	`db->cursor = newptr;`
114	`if (newptr->next) newptr->next->prev = newptr;`	114	`if (newptr->next) newptr->next->prev = newptr;`
115	`if (newptr->prev) newptr->prev->next = newptr;`	115	`if (newptr->prev) newptr->prev->next = newptr;`
116		116
117	`return(0);`	117	`return(0);`
118	`}`	118	`}`
119		119
120		120
121	`/* adds a new line at cursor position into file linked list and advance cursor`	121	`/* adds a new line at cursor position into file linked list and advance cursor`
122	`* returns non-zero on error */`	122	`* returns non-zero on error */`
123	`static int line_add(struct file db, const char far line, unsigned short slen) {`	123	`static int line_add(struct file db, const char far line, unsigned short slen) {`
124	`struct line far *l;`	124	`struct line far *l;`
125		125
126	`l = line_calloc(slen);`	126	`l = line_calloc(slen);`
127	`if (l == NULL) return(-1);`	127	`if (l == NULL) return(-1);`
128		128
129	`l->prev = db->cursor;`	129	`l->prev = db->cursor;`
130	`if (db->cursor) {`	130	`if (db->cursor) {`
131	`l->next = db->cursor->next;`	131	`l->next = db->cursor->next;`
132	`db->cursor->next = l;`	132	`db->cursor->next = l;`
133	`l->next->prev = l;`	133	`l->next->prev = l;`
134	`}`	134	`}`
135	`db->cursor = l;`	135	`db->cursor = l;`
136	`if (slen > 0) {`	136	`if (slen > 0) {`
137	`_fmemmove(l->payload, line, slen);`	137	`_fmemmove(l->payload, line, slen);`
138	`l->len = slen;`	138	`l->len = slen;`
139	`}`	139	`}`
140		140
141	`db->totlines += 1;`	141	`db->totlines += 1;`
142	`db->curline += 1;`	142	`db->curline += 1;`
143		143
144	`return(0);`	144	`return(0);`
145	`}`	145	`}`
146		146
147		147
148	`static void ui_getstring(const char query, char s, unsigned short maxlen) {`	148	`static void ui_getstring(const char query, char s, unsigned short maxlen) {`
149	`unsigned short len = 0;`	149	`unsigned short len = 0;`
150	`unsigned char y, x;`	150	`unsigned char y, x;`
151	`int k;`	151	`int k;`
152		152
153	`if (maxlen == 0) return;`	153	`if (maxlen == 0) return;`
154	`maxlen--; /* make room for the nul terminator */`	154	`maxlen--; /* make room for the nul terminator */`
155		155
156	`y = screenh - 1;`	156	`y = screenh - 1;`
157		157
158	`/* print query string */`	158	`/* print query string */`
159	`x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);`	159	`x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);`
160	`mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);`	160	`mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);`
161		161
162	`for (;;) {`	162	`for (;;) {`
163	`mdr_cout_locate(y, x + len);`	163	`mdr_cout_locate(y, x + len);`
164	`k = keyb_getkey();`	164	`k = keyb_getkey();`
165		165
166	`switch (k) {`	166	`switch (k) {`
167	`case 0x1b: /* ESC */`	167	`case 0x1b: /* ESC */`
168	`s[0] = 0;`	168	`s[0] = 0;`
169	`return;`	169	`return;`
170	`case '\r':`	170	`case '\r':`
171	`s[len] = 0;`	171	`s[len] = 0;`
172	`return;`	172	`return;`
173	`case 0x08: /* BKSPC */`	173	`case 0x08: /* BKSPC */`
174	`if (len > 0) {`	174	`if (len > 0) {`
175	`len--;`	175	`len--;`
176	`mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);`	176	`mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);`
177	`}`	177	`}`
178	`break;`	178	`break;`
179	`default:`	179	`default:`
180	`if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {`	180	`if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {`
181	`mdr_cout_char(y, x + len, k, SCHEME_STBAR3);`	181	`mdr_cout_char(y, x + len, k, SCHEME_STBAR3);`
182	`s[len++] = k;`	182	`s[len++] = k;`
183	`}`	183	`}`
184	`}`	184	`}`
185	`}`	185	`}`
186		186
187	`}`	187	`}`
188		188
189		189
190	`/* append a nul-terminated string to line at cursor position */`	190	`/* append a nul-terminated string to line at cursor position */`
191	`static int line_append(struct file f, const char far buf, unsigned short len) {`	191	`static int line_append(struct file f, const char far buf, unsigned short len) {`
192	`if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */`	192	`if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */`
193	`if (curline_resize(f, f->cursor->len + len) != 0) return(-1);`	193	`if (curline_resize(f, f->cursor->len + len) != 0) return(-1);`
194	`_fmemmove(f->cursor->payload + f->cursor->len, buf, len);`	194	`_fmemmove(f->cursor->payload + f->cursor->len, buf, len);`
195	`f->cursor->len += len;`	195	`f->cursor->len += len;`
196		196
197	`return(0);`	197	`return(0);`
198	`}`	198	`}`
199		199
200		200
201	`static void db_rewind(struct file *db) {`	201	`static void db_rewind(struct file *db) {`
202	`if (db->cursor == NULL) return;`	202	`if (db->cursor == NULL) return;`
203	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	203	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
204	`db->curline = 0;`	204	`db->curline = 0;`
205	`}`	205	`}`
206		206
207		207
208	`static void ui_basic(const struct file *db) {`	208	`static void ui_basic(const struct file *db) {`
209	`const char s = svarlang_strid(0); / HELP */`	209	`const char s = svarlang_strid(0); / HELP */`
210	`unsigned short helpcol = screenw - strlen(s);`	210	`unsigned short helpcol = screenw - strlen(s);`
211		211
212	`/* fill status bar with background (without modflag as it is refreshed by ui_refresh) */`	212	`/* fill status bar with background (without modflag as it is refreshed by ui_refresh) */`
213	`mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);`	213	`mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);`
214		214
215	`/* filename */`	215	`/* filename */`
216	`{`	216	`{`
217	`const char *fn = db->fname;`	217	`const char *fn = db->fname;`
218	`if (*fn == 0) fn = svarlang_str(0, 1);`	218	`if (*fn == 0) fn = svarlang_str(0, 1);`
219	`mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);`	219	`mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);`
220	`}`	220	`}`
221		221
222	`/* eol type */`	222	`/* eol type */`
223	`{`	223	`{`
224	`const char *eoltype = "CRLF";`	224	`const char *eoltype = "CRLF";`
225	`if (db->lfonly) eoltype = "LF";`	225	`if (db->lfonly) eoltype += 2;`
226	`mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);`	226	`mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);`
227	`}`	227	`}`
228		228
229	`mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);`	229	`mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);`
230	`}`	230	`}`
231		231
232		232
233	`static void ui_msg(const char msg1, const char msg2, unsigned char attr) {`	233	`static void ui_msg(const char msg1, const char msg2, unsigned char attr) {`
234	`unsigned short x, y, msglen, i;`	234	`unsigned short x, y, msglen, i;`
235	`unsigned char msg2flag = 0;`	235	`unsigned char msg2flag = 0;`
236		236
237	`msglen = strlen(msg1);`	237	`msglen = strlen(msg1);`
238	`if (msg2) {`	238	`if (msg2) {`
239	`msg2flag = 1;`	239	`msg2flag = 1;`
240	`i = strlen(msg2);`	240	`i = strlen(msg2);`
241	`if (i > msglen) msglen = i;`	241	`if (i > msglen) msglen = i;`
242	`}`	242	`}`
243		243
244	`y = (screenh - 6) >> 1;`	244	`y = (screenh - 6) >> 1;`
245	`x = (screenw - msglen - 4) >> 1;`	245	`x = (screenw - msglen - 4) >> 1;`
246	`for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`	246	`for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`
247	`x++;`	247	`x++;`
248		248
249	`mdr_cout_str(y+1, x, msg1, attr, msglen);`	249	`mdr_cout_str(y+1, x, msg1, attr, msglen);`
250	`if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);`	250	`if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);`
251		251
252	`if (uidirty.from > y) uidirty.from = y;`	252	`if (uidirty.from > y) uidirty.from = y;`
253	`if (uidirty.to < y+4) uidirty.to = y+4;`	253	`if (uidirty.to < y+4) uidirty.to = y+4;`
254	`}`	254	`}`
255		255
256		256
257	`static unsigned char ui_confirm_if_unsaved(struct file *db) {`	257	`static unsigned char ui_confirm_if_unsaved(struct file *db) {`
258	`if (db->modflag == 0) return(0);`	258	`if (db->modflag == 0) return(0);`
259		259
260	`/* if file has been modified then ask for confirmation */`	260	`/* if file has been modified then ask for confirmation */`
261	`ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);`	261	`ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);`
262	`if (keyb_getkey() == '\r') return(0);`	262	`if (keyb_getkey() == '\r') return(0);`
263		263
264	`return(1);`	264	`return(1);`
265	`}`	265	`}`
266		266
267		267
268	`static void ui_help(void) {`	268	`static void ui_help(void) {`
269	`#define MAXLINLEN 39`	269	`#define MAXLINLEN 39`
270	`unsigned short i, offset;`	270	`unsigned short i, offset;`
271	`offset = (screenw - MAXLINLEN) >> 1;`	271	`offset = (screenw - MAXLINLEN) >> 1;`
272		272
273	`for (i = 3; i < 25; i++) {`	273	`for (i = 3; i < 25; i++) {`
274	`const char *s = svarlang_str(8, i);`	274	`const char *s = svarlang_str(8, i);`
275	`if (s[0] == 0) break;`	275	`if (s[0] == 0) break;`
276	`mdr_cout_char_rep(i, offset, ' ', SCHEME_STBAR1, MAXLINLEN);`	276	`mdr_cout_char_rep(i, offset, ' ', SCHEME_STBAR1, MAXLINLEN);`
277	`if (s[0] == '.') continue;`	277	`if (s[0] == '.') continue;`
278	`mdr_cout_locate(i, offset + 2 + mdr_cout_str(i, offset + 2, s, SCHEME_STBAR1, MAXLINLEN - 2));`	278	`mdr_cout_locate(i, offset + 2 + mdr_cout_str(i, offset + 2, s, SCHEME_STBAR1, MAXLINLEN - 2));`
279	`}`	279	`}`
280		280
281	`keyb_getkey();`	281	`keyb_getkey();`
282	`#undef MAXLINLEN`	282	`#undef MAXLINLEN`
283	`}`	283	`}`
284		284
285		285
286	`static void ui_refresh(const struct file *db) {`	286	`static void ui_refresh(const struct file *db) {`
287	`unsigned char x;`	287	`unsigned char x;`
288	`const struct line far *l;`	288	`const struct line far *l;`
289	`unsigned char y = db->cursorposy;`	289	`unsigned char y = db->cursorposy;`
290		290
291	`#ifdef DBG_REFRESH`	291	`#ifdef DBG_REFRESH`
292	`static char m = 'a';`	292	`static char m = 'a';`
293	`m++;`	293	`m++;`
294	`if (m > 'z') m = 'a';`	294	`if (m > 'z') m = 'a';`
295	`#endif`	295	`#endif`
296		296
297	`/* rewind cursor line to first line that needs redrawing */`	297	`/* rewind cursor line to first line that needs redrawing */`
298	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`	298	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`
299		299
300	`/* iterate over lines and redraw whatever needs to be redrawn */`	300	`/* iterate over lines and redraw whatever needs to be redrawn */`
301	`for (; l != NULL; l = l->next, y++) {`	301	`for (; l != NULL; l = l->next, y++) {`
302		302
303	`/* skip lines that do not need to be refreshed */`	303	`/* skip lines that do not need to be refreshed */`
304	`if (y < uidirty.from) continue;`	304	`if (y < uidirty.from) continue;`
305	`if (y > uidirty.to) break;`	305	`if (y > uidirty.to) break;`
306		306
307	`x = 0;`	307	`x = 0;`
308	`if (db->xoffset < l->len) {`	308	`if (db->xoffset < l->len) {`
309	`unsigned char i, limit;`	309	`unsigned char i, limit;`
310	`if (l->len - db->xoffset < screenw) {`	310	`if (l->len - db->xoffset < screenw) {`
311	`limit = l->len;`	311	`limit = l->len;`
312	`} else {`	312	`} else {`
313	`limit = db->xoffset + screenw - 1;`	313	`limit = db->xoffset + screenw - 1;`
314	`}`	314	`}`
315	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);`	315	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);`
316	`}`	316	`}`
317		317
318	`/* write empty spaces until end of line */`	318	`/* write empty spaces until end of line */`
319	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);`	319	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);`
320		320
321	`#ifdef DBG_REFRESH`	321	`#ifdef DBG_REFRESH`
322	`mdr_cout_char(y, 0, m, SCHEME_STBAR1);`	322	`mdr_cout_char(y, 0, m, SCHEME_STBAR1);`
323	`#endif`	323	`#endif`
324		324
325	`if (y == screenh - 2) break;`	325	`if (y == screenh - 2) break;`
326	`}`	326	`}`
327		327
328	`/* fill all lines below if empty (and they need to be redrawn) */`	328	`/* fill all lines below if empty (and they need to be redrawn) */`
329	`if (l == NULL) {`	329	`if (l == NULL) {`
330	`while ((y < screenh - 1) && (y < uidirty.to)) {`	330	`while ((y < screenh - 1) && (y < uidirty.to)) {`
331	`mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);`	331	`mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);`
332	`}`	332	`}`
333	`}`	333	`}`
334		334
335	`/* "file changed" flag */`	335	`/* "file changed" flag */`
336	`mdr_cout_char(screenh - 1, 0, db->modflag, SCHEME_STBAR1);`	336	`mdr_cout_char(screenh - 1, 0, db->modflag, SCHEME_STBAR1);`
337		337
338	`/* scroll bar */`	338	`/* scroll bar */`
339	`for (y = 0; y < (screenh - 1); y++) {`	339	`for (y = 0; y < (screenh - 1); y++) {`
340	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);`	340	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);`
341	`}`	341	`}`
342		342
343	`/* scroll cursor */`	343	`/* scroll cursor */`
344	`if (db->totlines >= screenh) {`	344	`if (db->totlines >= screenh) {`
345	`unsigned short topline = db->curline - db->cursorposy;`	345	`unsigned short topline = db->curline - db->cursorposy;`
346	`unsigned short col;`	346	`unsigned short col;`
347	`unsigned short totlines = db->totlines - screenh + 1;`	347	`unsigned short totlines = db->totlines - screenh + 1;`
348	`if (db->totlines - screenh > screenh) {`	348	`if (db->totlines - screenh > screenh) {`
349	`col = topline / (totlines / (screenh - 1));`	349	`col = topline / (totlines / (screenh - 1));`
350	`} else {`	350	`} else {`
351	`col = topline * (screenh - 1) / totlines;`	351	`col = topline * (screenh - 1) / totlines;`
352	`}`	352	`}`
353	`if (col >= screenh - 1) col = screenh - 2;`	353	`if (col >= screenh - 1) col = screenh - 2;`
354	`mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);`	354	`mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);`
355	`}`	355	`}`
356	`}`	356	`}`
357		357
358		358
359	`static void check_cursor_not_after_eol(struct file *db) {`	359	`static void check_cursor_not_after_eol(struct file *db) {`
360	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	360	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
361		361
362	`if (db->cursor->len < db->xoffset) {`	362	`if (db->cursor->len < db->xoffset) {`
363	`db->cursorposx = 0;`	363	`db->cursorposx = 0;`
364	`db->xoffset = db->cursor->len;`	364	`db->xoffset = db->cursor->len;`
365	`uidirty.from = 0;`	365	`uidirty.from = 0;`
366	`uidirty.to = 0xff;`	366	`uidirty.to = 0xff;`
367	`} else {`	367	`} else {`
368	`db->cursorposx = db->cursor->len - db->xoffset;`	368	`db->cursorposx = db->cursor->len - db->xoffset;`
369	`}`	369	`}`
370	`}`	370	`}`
371		371
372		372
373	`static void cursor_up(struct file *db) {`	373	`static void cursor_up(struct file *db) {`
374	`if (db->cursor->prev != NULL) {`	374	`if (db->cursor->prev != NULL) {`
375	`db->curline -= 1;`	375	`db->curline -= 1;`
376	`db->cursor = db->cursor->prev;`	376	`db->cursor = db->cursor->prev;`
377	`if (db->cursorposy == 0) {`	377	`if (db->cursorposy == 0) {`
378	`uidirty.from = 0;`	378	`uidirty.from = 0;`
379	`uidirty.to = 0xff;`	379	`uidirty.to = 0xff;`
380	`} else {`	380	`} else {`
381	`db->cursorposy -= 1;`	381	`db->cursorposy -= 1;`
382	`}`	382	`}`
383	`}`	383	`}`
384	`}`	384	`}`
385		385
386		386
387	`static void cursor_eol(struct file *db) {`	387	`static void cursor_eol(struct file *db) {`
388	`/* adjust xoffset to make sure eol is visible on screen */`	388	`/* adjust xoffset to make sure eol is visible on screen */`
389	`if (db->xoffset > db->cursor->len) {`	389	`if (db->xoffset > db->cursor->len) {`
390	`db->xoffset = db->cursor->len - 1;`	390	`db->xoffset = db->cursor->len - 1;`
391	`uidirty.from = 0;`	391	`uidirty.from = 0;`
392	`uidirty.to = 0xff;`	392	`uidirty.to = 0xff;`
393	`}`	393	`}`
394		394
395	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	395	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
396	`db->xoffset = db->cursor->len - screenw + 2;`	396	`db->xoffset = db->cursor->len - screenw + 2;`
397	`uidirty.from = 0;`	397	`uidirty.from = 0;`
398	`uidirty.to = 0xff;`	398	`uidirty.to = 0xff;`
399	`}`	399	`}`
400	`db->cursorposx = db->cursor->len - db->xoffset;`	400	`db->cursorposx = db->cursor->len - db->xoffset;`
401	`}`	401	`}`
402		402
403		403
404	`static void cursor_down(struct file *db) {`	404	`static void cursor_down(struct file *db) {`
405	`if (db->cursor->next != NULL) {`	405	`if (db->cursor->next != NULL) {`
406	`db->curline += 1;`	406	`db->curline += 1;`
407	`db->cursor = db->cursor->next;`	407	`db->cursor = db->cursor->next;`
408	`if (db->cursorposy < screenh - 2) {`	408	`if (db->cursorposy < screenh - 2) {`
409	`db->cursorposy += 1;`	409	`db->cursorposy += 1;`
410	`} else {`	410	`} else {`
411	`uidirty.from = 0;`	411	`uidirty.from = 0;`
412	`uidirty.to = 0xff;`	412	`uidirty.to = 0xff;`
413	`}`	413	`}`
414	`}`	414	`}`
415	`}`	415	`}`
416		416
417		417
418	`static void cursor_left(struct file *db) {`	418	`static void cursor_left(struct file *db) {`
419	`if (db->cursorposx > 0) {`	419	`if (db->cursorposx > 0) {`
420	`db->cursorposx -= 1;`	420	`db->cursorposx -= 1;`
421	`} else if (db->xoffset > 0) {`	421	`} else if (db->xoffset > 0) {`
422	`db->xoffset -= 1;`	422	`db->xoffset -= 1;`
423	`uidirty.from = 0;`	423	`uidirty.from = 0;`
424	`uidirty.to = 0xff;`	424	`uidirty.to = 0xff;`
425	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	425	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
426	`cursor_up(db);`	426	`cursor_up(db);`
427	`cursor_eol(db);`	427	`cursor_eol(db);`
428	`}`	428	`}`
429	`}`	429	`}`
430		430
431		431
432	`static void cursor_home(struct file *db) {`	432	`static void cursor_home(struct file *db) {`
433	`db->cursorposx = 0;`	433	`db->cursorposx = 0;`
434	`if (db->xoffset != 0) {`	434	`if (db->xoffset != 0) {`
435	`db->xoffset = 0;`	435	`db->xoffset = 0;`
436	`uidirty.from = 0;`	436	`uidirty.from = 0;`
437	`uidirty.to = 0xff;`	437	`uidirty.to = 0xff;`
438	`}`	438	`}`
439	`}`	439	`}`
440		440
441		441
442	`static void cursor_right(struct file *db) {`	442	`static void cursor_right(struct file *db) {`
443	`if (db->cursor->len > db->xoffset + db->cursorposx) {`	443	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
444	`if (db->cursorposx < screenw - 2) {`	444	`if (db->cursorposx < screenw - 2) {`
445	`db->cursorposx += 1;`	445	`db->cursorposx += 1;`
446	`} else {`	446	`} else {`
447	`db->xoffset += 1;`	447	`db->xoffset += 1;`
448	`uidirty.from = 0;`	448	`uidirty.from = 0;`
449	`uidirty.to = 0xff;`	449	`uidirty.to = 0xff;`
450	`}`	450	`}`
451	`} else {`	451	`} else {`
452	`cursor_down(db);`	452	`cursor_down(db);`
453	`cursor_home(db);`	453	`cursor_home(db);`
454	`}`	454	`}`
455	`}`	455	`}`
456		456
457		457
458	`static void del(struct file *db) {`	458	`static void del(struct file *db) {`
459	`if (db->cursorposx + db->xoffset < db->cursor->len) {`	459	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
460	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`	460	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`
461	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	461	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
462	`uidirty.from = db->cursorposy;`	462	`uidirty.from = db->cursorposy;`
463	`uidirty.to = db->cursorposy;`	463	`uidirty.to = db->cursorposy;`
464	`db->modflag = '*';`	464	`db->modflag = '*';`
465	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	465	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`
466	`struct line far *nextline = db->cursor->next;`	466	`struct line far *nextline = db->cursor->next;`
467	`if (db->cursor->next->len > 0) {`	467	`if (db->cursor->next->len > 0) {`
468	`if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {`	468	`if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {`
469	`_fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	469	`_fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
470	`db->cursor->len += db->cursor->next->len;`	470	`db->cursor->len += db->cursor->next->len;`
471	`}`	471	`}`
472	`}`	472	`}`
473		473
474	`db->cursor->next = db->cursor->next->next;`	474	`db->cursor->next = db->cursor->next->next;`
475	`db->cursor->next->prev = db->cursor;`	475	`db->cursor->next->prev = db->cursor;`
476		476
477	`line_free(nextline);`	477	`line_free(nextline);`
478	`uidirty.from = db->cursorposy;`	478	`uidirty.from = db->cursorposy;`
479	`uidirty.to = 0xff;`	479	`uidirty.to = 0xff;`
480	`db->totlines -= 1;`	480	`db->totlines -= 1;`
481	`db->modflag = '*';`	481	`db->modflag = '*';`
482	`}`	482	`}`
483	`}`	483	`}`
484		484
485		485
486	`static void bkspc(struct file *db) {`	486	`static void bkspc(struct file *db) {`
487		487
488	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	488	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
489	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	489	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
490		490
491	`cursor_left(db);`	491	`cursor_left(db);`
492	`del(db);`	492	`del(db);`
493	`}`	493	`}`
494		494
495		495
496	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	496	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
497	`* of argc and argv, saves some 330 bytes of binary size */`	497	`* of argc and argv, saves some 330 bytes of binary size */`
498	`static const char *parseargv(void) {`	498	`static const char *parseargv(void) {`
499	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	499	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
500	`unsigned short count = 0;`	500	`unsigned short count = 0;`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1559 – Rev 1352 → 1353