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 {
  int fd;
  struct line far *cursor;
  unsigned short xoffset;
  unsigned char cursorposx;
  unsigned char 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 signed char 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 char maxlen) {
  unsigned char len = 0, 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 char 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 = "LF";
    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 35
  unsigned char i, offset;
  offset = (screenw - MAXLINLEN + 2) >> 1;
 
  for (i = 2; i < 18; i++) {
    mdr_cout_char_rep(i, offset - 2, ' ', SCHEME_STBAR1, MAXLINLEN + 2);
  }
 
  for (i = 0; i < 20; i++) {
    const char *s = svarlang_str(8, i);
    if (s[0] == 0) break;
    if (s[0] == '.') continue;
    mdr_cout_locate(3 + i, offset + mdr_cout_str(3 + i, offset, s, SCHEME_STBAR1, MAXLINLEN));
  }
 
  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 */
  {
    char flg = ' ';
    if (db->modflag) flg = '*';
    mdr_cout_char(screenh - 1, 0, flg, 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 = 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 == 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 char *parseargv(void) {
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
  unsigned char count = 0;
  char *argv[4];
 
  while (count < 4) {
    /* jump to nearest arg */
    while (*tail == ' ') {
      *tail = 0;
      tail++;
    }
 
    if (*tail == '\r') {
      *tail = 0;
      break;
    }
 
    argv[count++] = tail;
 
    /* jump to next delimiter */
    while ((*tail != ' ') && (*tail != '\r')) tail++;
  }
 
  /* check args now */
  if (count == 0) return("");
 
  return(argv[0]);
}
 
 
/* 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 = 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);
    }
  }
}
 
 
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));
 
  /* add a single empty line and rewind */
  line_add(db, NULL, 0);
  db_rewind(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;
  }
}
 
 
int 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) {
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
    return(0);
  }
 
  /* load file */
  {
    unsigned char err = loadfile(db, fname);
    if (err == 1) {
      mdr_coutraw_puts(svarlang_str(0,11)); /* file not found */
      return(1);
    } else if (err != 0) {
      mdr_coutraw_puts(svarlang_str(0,10)); /* ERROR */
      return(1);
    }
  }
 
  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 = 1;
        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 */
      const char *tab = "        ";
      insert_in_line(db, tab, 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);
      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 = 1;
      db->lfonly ^= 1;
      uidirty.statusbar = 1;
 
    } 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(0);
}
 

Rev 1345	Rev 1346
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>`	-
29	`#include <string.h>`	28	`#include <string.h>`
30		29
31	`#include "mdr\bios.h"`	30	`#include "mdr\bios.h"`
32	`#include "mdr\cout.h"`	31	`#include "mdr\cout.h"`
33	`#include "mdr\dos.h"`	32	`#include "mdr\dos.h"`
34	`#include "mdr\keyb.h"`	33	`#include "mdr\keyb.h"`
35		34
36	`#include "svarlang\svarlang.h"`	35	`#include "svarlang\svarlang.h"`
37		36
38		37
39	`/*****************************************************************************`	38	`/*****************************************************************************`
40	`* global variables and definitions *`	39	`* global variables and definitions *`
41	`*****************************************************************************/`	40	`*****************************************************************************/`
42		41
43	`/* 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) */`
44	`static unsigned char SCHEME_TEXT = 0x07,`	43	`static unsigned char SCHEME_TEXT = 0x07,`
45	`SCHEME_STBAR1 = 0x70,`	44	`SCHEME_STBAR1 = 0x70,`
46	`SCHEME_STBAR2 = 0x70,`	45	`SCHEME_STBAR2 = 0x70,`
47	`SCHEME_STBAR3 = 0xf0,`	46	`SCHEME_STBAR3 = 0xf0,`
48	`SCHEME_SCROLL = 0x70,`	47	`SCHEME_SCROLL = 0x70,`
49	`SCHEME_MSG = 0x70,`	48	`SCHEME_MSG = 0x70,`
50	`SCHEME_ERR = 0xf0;`	49	`SCHEME_ERR = 0xf0;`
51		50
52	`static unsigned char screenw, screenh;`	51	`static unsigned char screenw, screenh;`
53		52
54	`static struct {`	53	`static struct {`
55	`unsigned char from;`	54	`unsigned char from;`
56	`unsigned char to;`	55	`unsigned char to;`
57	`unsigned char statusbar;`	56	`unsigned char statusbar;`
58	`} 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 */`
59		58
60	`#define SCROLL_CURSOR 0xB1`	59	`#define SCROLL_CURSOR 0xB1`
61		60
62	`struct line {`	61	`struct line {`
63	`struct line far *prev;`	62	`struct line far *prev;`
64	`struct line far *next;`	63	`struct line far *next;`
65	`unsigned short len;`	64	`unsigned short len;`
66	`char payload[1];`	65	`char payload[1];`
67	`};`	66	`};`
68		67
69	`struct file {`	68	`struct file {`
70	`int fd;`	69	`int fd;`
71	`struct line far *cursor;`	70	`struct line far *cursor;`
72	`unsigned short xoffset;`	71	`unsigned short xoffset;`
73	`unsigned char cursorposx;`	72	`unsigned char cursorposx;`
74	`unsigned char cursorposy;`	73	`unsigned char cursorposy;`
75	`unsigned short totlines;`	74	`unsigned short totlines;`
76	`unsigned short curline;`	75	`unsigned short curline;`
77	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`	76	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`
78	`char modflag; /* non-zero if file has been modified since last save */`	77	`char modflag; /* non-zero if file has been modified since last save */`
79	`char fname[128];`	78	`char fname[128];`
80	`};`	79	`};`
81		80
82		81
83	`/*****************************************************************************`	82	`/*****************************************************************************`
84	`* functions *`	83	`* functions *`
85	`*****************************************************************************/`	84	`*****************************************************************************/`
86		85
87	`static struct line far *line_calloc(unsigned short siz) {`	86	`static struct line far *line_calloc(unsigned short siz) {`
88	`struct line far *res;`	87	`struct line far *res;`
89	`unsigned int seg;`	88	`unsigned int seg;`
90	`if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);`	89	`if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);`
91	`res = MK_FP(seg, 0);`	90	`res = MK_FP(seg, 0);`
92	`_fmemset(res, 0, sizeof(struct line) + siz);`	91	`_fmemset(res, 0, sizeof(struct line) + siz);`
93	`return(MK_FP(seg, 0));`	92	`return(MK_FP(seg, 0));`
94	`}`	93	`}`
95		94
96		95
97	`static void line_free(struct line far *ptr) {`	96	`static void line_free(struct line far *ptr) {`
98	`_dos_freemem(FP_SEG(ptr));`	97	`_dos_freemem(FP_SEG(ptr));`
99	`}`	98	`}`
100		99
101		100
102	`static signed char curline_resize(struct file far *db, unsigned short newsiz) {`	101	`static signed char curline_resize(struct file far *db, unsigned short newsiz) {`
103	`unsigned int maxavail;`	102	`unsigned int maxavail;`
104	`struct line far *newptr;`	103	`struct line far *newptr;`
105		104
106	`/* try resizing the block (much faster) */`	105	`/* try resizing the block (much faster) */`
107	`if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);`	106	`if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);`
108		107
109	`/* create a new block and copy data over */`	108	`/* create a new block and copy data over */`
110	`newptr = line_calloc(newsiz);`	109	`newptr = line_calloc(newsiz);`
111	`if (newptr == NULL) return(-1);`	110	`if (newptr == NULL) return(-1);`
112	`_fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);`	111	`_fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);`
113		112
114	`/* rewire the linked list */`	113	`/* rewire the linked list */`
115	`db->cursor = newptr;`	114	`db->cursor = newptr;`
116	`if (newptr->next) newptr->next->prev = newptr;`	115	`if (newptr->next) newptr->next->prev = newptr;`
117	`if (newptr->prev) newptr->prev->next = newptr;`	116	`if (newptr->prev) newptr->prev->next = newptr;`
118		117
119	`return(0);`	118	`return(0);`
120	`}`	119	`}`
121		120
122		121
123	`/* adds a new line at cursor position into file linked list and advance cursor`	122	`/* adds a new line at cursor position into file linked list and advance cursor`
124	`* returns non-zero on error */`	123	`* returns non-zero on error */`
125	`static int line_add(struct file db, const char far line, unsigned short slen) {`	124	`static int line_add(struct file db, const char far line, unsigned short slen) {`
126	`struct line far *l;`	125	`struct line far *l;`
127		126
128	`l = line_calloc(slen);`	127	`l = line_calloc(slen);`
129	`if (l == NULL) return(-1);`	128	`if (l == NULL) return(-1);`
130		129
131	`l->prev = db->cursor;`	130	`l->prev = db->cursor;`
132	`if (db->cursor) {`	131	`if (db->cursor) {`
133	`l->next = db->cursor->next;`	132	`l->next = db->cursor->next;`
134	`db->cursor->next = l;`	133	`db->cursor->next = l;`
135	`l->next->prev = l;`	134	`l->next->prev = l;`
136	`}`	135	`}`
137	`db->cursor = l;`	136	`db->cursor = l;`
138	`if (slen > 0) {`	137	`if (slen > 0) {`
139	`_fmemmove(l->payload, line, slen);`	138	`_fmemmove(l->payload, line, slen);`
140	`l->len = slen;`	139	`l->len = slen;`
141	`}`	140	`}`
142		141
143	`db->totlines += 1;`	142	`db->totlines += 1;`
144	`db->curline += 1;`	143	`db->curline += 1;`
145		144
146	`return(0);`	145	`return(0);`
147	`}`	146	`}`
148		147
149		148
150	`static void ui_getstring(const char query, char s, unsigned char maxlen) {`	149	`static void ui_getstring(const char query, char s, unsigned char maxlen) {`
151	`unsigned char len = 0, y, x;`	150	`unsigned char len = 0, y, x;`
152	`int k;`	151	`int k;`
153		152
154	`if (maxlen == 0) return;`	153	`if (maxlen == 0) return;`
155	`maxlen--; /* make room for the nul terminator */`	154	`maxlen--; /* make room for the nul terminator */`
156		155
157	`y = screenh - 1;`	156	`y = screenh - 1;`
158		157
159	`/* print query string */`	158	`/* print query string */`
160	`x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);`	159	`x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);`
161	`mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);`	160	`mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);`
162		161
163	`for (;;) {`	162	`for (;;) {`
164	`mdr_cout_locate(y, x + len);`	163	`mdr_cout_locate(y, x + len);`
165	`k = keyb_getkey();`	164	`k = keyb_getkey();`
166		165
167	`switch (k) {`	166	`switch (k) {`
168	`case 0x1b: /* ESC */`	167	`case 0x1b: /* ESC */`
169	`s[0] = 0;`	168	`s[0] = 0;`
170	`return;`	169	`return;`
171	`case '\r':`	170	`case '\r':`
172	`s[len] = 0;`	171	`s[len] = 0;`
173	`return;`	172	`return;`
174	`case 0x08: /* BKSPC */`	173	`case 0x08: /* BKSPC */`
175	`if (len > 0) {`	174	`if (len > 0) {`
176	`len--;`	175	`len--;`
177	`mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);`	176	`mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);`
178	`}`	177	`}`
179	`break;`	178	`break;`
180	`default:`	179	`default:`
181	`if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {`	180	`if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {`
182	`mdr_cout_char(y, x + len, k, SCHEME_STBAR3);`	181	`mdr_cout_char(y, x + len, k, SCHEME_STBAR3);`
183	`s[len++] = k;`	182	`s[len++] = k;`
184	`}`	183	`}`
185	`}`	184	`}`
186	`}`	185	`}`
187		186
188	`}`	187	`}`
189		188
190		189
191	`/* append a nul-terminated string to line at cursor position */`	190	`/* append a nul-terminated string to line at cursor position */`
192	`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) {`
193	`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 */`
194	`if (curline_resize(f, f->cursor->len + len) != 0) return(-1);`	193	`if (curline_resize(f, f->cursor->len + len) != 0) return(-1);`
195	`_fmemmove(f->cursor->payload + f->cursor->len, buf, len);`	194	`_fmemmove(f->cursor->payload + f->cursor->len, buf, len);`
196	`f->cursor->len += len;`	195	`f->cursor->len += len;`
197		196
198	`return(0);`	197	`return(0);`
199	`}`	198	`}`
200		199
201		200
202	`static void db_rewind(struct file *db) {`	201	`static void db_rewind(struct file *db) {`
203	`if (db->cursor == NULL) return;`	202	`if (db->cursor == NULL) return;`
204	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	203	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
205	`db->curline = 0;`	204	`db->curline = 0;`
206	`}`	205	`}`
207		206
208		207
209	`static void ui_basic(const struct file *db) {`	208	`static void ui_basic(const struct file *db) {`
210	`const char s = svarlang_strid(0); / HELP */`	209	`const char s = svarlang_strid(0); / HELP */`
211	`unsigned char helpcol = screenw - strlen(s);`	210	`unsigned char helpcol = screenw - strlen(s);`
212		211
213	`/* 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) */`
214	`mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);`	213	`mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);`
215		214
216	`/* filename */`	215	`/* filename */`
217	`{`	216	`{`
218	`const char *fn = db->fname;`	217	`const char *fn = db->fname;`
219	`if (*fn == 0) fn = svarlang_str(0, 1);`	218	`if (*fn == 0) fn = svarlang_str(0, 1);`
220	`mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);`	219	`mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);`
221	`}`	220	`}`
222		221
223	`/* eol type */`	222	`/* eol type */`
224	`{`	223	`{`
225	`const char *eoltype = "CRLF";`	224	`const char *eoltype = "CRLF";`
226	`if (db->lfonly) eoltype = "LF";`	225	`if (db->lfonly) eoltype = "LF";`
227	`mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);`	226	`mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);`
228	`}`	227	`}`
229		228
230	`mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);`	229	`mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);`
231	`}`	230	`}`
232		231
233		232
234	`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) {`
235	`unsigned short x, y, msglen, i;`	234	`unsigned short x, y, msglen, i;`
236	`unsigned char msg2flag = 0;`	235	`unsigned char msg2flag = 0;`
237		236
238	`msglen = strlen(msg1);`	237	`msglen = strlen(msg1);`
239	`if (msg2) {`	238	`if (msg2) {`
240	`msg2flag = 1;`	239	`msg2flag = 1;`
241	`i = strlen(msg2);`	240	`i = strlen(msg2);`
242	`if (i > msglen) msglen = i;`	241	`if (i > msglen) msglen = i;`
243	`}`	242	`}`
244		243
245	`y = (screenh - 6) >> 1;`	244	`y = (screenh - 6) >> 1;`
246	`x = (screenw - msglen - 4) >> 1;`	245	`x = (screenw - msglen - 4) >> 1;`
247	`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);`
248	`x++;`	247	`x++;`
249		248
250	`mdr_cout_str(y+1, x, msg1, attr, msglen);`	249	`mdr_cout_str(y+1, x, msg1, attr, msglen);`
251	`if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);`	250	`if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);`
252		251
253	`if (uidirty.from > y) uidirty.from = y;`	252	`if (uidirty.from > y) uidirty.from = y;`
254	`if (uidirty.to < y+4) uidirty.to = y+4;`	253	`if (uidirty.to < y+4) uidirty.to = y+4;`
255	`}`	254	`}`
256		255
257		256
258	`static unsigned char ui_confirm_if_unsaved(struct file *db) {`	257	`static unsigned char ui_confirm_if_unsaved(struct file *db) {`
259	`if (db->modflag == 0) return(0);`	258	`if (db->modflag == 0) return(0);`
260		259
261	`/* if file has been modified then ask for confirmation */`	260	`/* if file has been modified then ask for confirmation */`
262	`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);`
263	`if (keyb_getkey() == '\r') return(0);`	262	`if (keyb_getkey() == '\r') return(0);`
264		263
265	`return(1);`	264	`return(1);`
266	`}`	265	`}`
267		266
268		267
269	`static void ui_help(void) {`	268	`static void ui_help(void) {`
270	`#define MAXLINLEN 35`	269	`#define MAXLINLEN 35`
271	`unsigned char i, offset;`	270	`unsigned char i, offset;`
272	`offset = (screenw - MAXLINLEN + 2) >> 1;`	271	`offset = (screenw - MAXLINLEN + 2) >> 1;`
273		272
274	`for (i = 2; i < 18; i++) {`	273	`for (i = 2; i < 18; i++) {`
275	`mdr_cout_char_rep(i, offset - 2, ' ', SCHEME_STBAR1, MAXLINLEN + 2);`	274	`mdr_cout_char_rep(i, offset - 2, ' ', SCHEME_STBAR1, MAXLINLEN + 2);`
276	`}`	275	`}`
277		276
278	`for (i = 0; i < 20; i++) {`	277	`for (i = 0; i < 20; i++) {`
279	`const char *s = svarlang_str(8, i);`	278	`const char *s = svarlang_str(8, i);`
280	`if (s[0] == 0) break;`	279	`if (s[0] == 0) break;`
281	`if (s[0] == '.') continue;`	280	`if (s[0] == '.') continue;`
282	`mdr_cout_locate(3 + i, offset + mdr_cout_str(3 + i, offset, s, SCHEME_STBAR1, MAXLINLEN));`	281	`mdr_cout_locate(3 + i, offset + mdr_cout_str(3 + i, offset, s, SCHEME_STBAR1, MAXLINLEN));`
283	`}`	282	`}`
284		283
285	`keyb_getkey();`	284	`keyb_getkey();`
286	`#undef MAXLINLEN`	285	`#undef MAXLINLEN`
287	`}`	286	`}`
288		287
289		288
290	`static void ui_refresh(const struct file *db) {`	289	`static void ui_refresh(const struct file *db) {`
291	`unsigned char x;`	290	`unsigned char x;`
292	`const struct line far *l;`	291	`const struct line far *l;`
293	`unsigned char y = db->cursorposy;`	292	`unsigned char y = db->cursorposy;`
294		293
295	`#ifdef DBG_REFRESH`	294	`#ifdef DBG_REFRESH`
296	`static char m = 'a';`	295	`static char m = 'a';`
297	`m++;`	296	`m++;`
298	`if (m > 'z') m = 'a';`	297	`if (m > 'z') m = 'a';`
299	`#endif`	298	`#endif`
300		299
301	`/* rewind cursor line to first line that needs redrawing */`	300	`/* rewind cursor line to first line that needs redrawing */`
302	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`	301	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`
303		302
304	`/* iterate over lines and redraw whatever needs to be redrawn */`	303	`/* iterate over lines and redraw whatever needs to be redrawn */`
305	`for (; l != NULL; l = l->next, y++) {`	304	`for (; l != NULL; l = l->next, y++) {`
306		305
307	`/* skip lines that do not need to be refreshed */`	306	`/* skip lines that do not need to be refreshed */`
308	`if (y < uidirty.from) continue;`	307	`if (y < uidirty.from) continue;`
309	`if (y > uidirty.to) break;`	308	`if (y > uidirty.to) break;`
310		309
311	`x = 0;`	310	`x = 0;`
312	`if (db->xoffset < l->len) {`	311	`if (db->xoffset < l->len) {`
313	`unsigned char i, limit;`	312	`unsigned char i, limit;`
314	`if (l->len - db->xoffset < screenw) {`	313	`if (l->len - db->xoffset < screenw) {`
315	`limit = l->len;`	314	`limit = l->len;`
316	`} else {`	315	`} else {`
317	`limit = db->xoffset + screenw - 1;`	316	`limit = db->xoffset + screenw - 1;`
318	`}`	317	`}`
319	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);`	318	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);`
320	`}`	319	`}`
321		320
322	`/* write empty spaces until end of line */`	321	`/* write empty spaces until end of line */`
323	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);`	322	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);`
324		323
325	`#ifdef DBG_REFRESH`	324	`#ifdef DBG_REFRESH`
326	`mdr_cout_char(y, 0, m, SCHEME_STBAR1);`	325	`mdr_cout_char(y, 0, m, SCHEME_STBAR1);`
327	`#endif`	326	`#endif`
328		327
329	`if (y == screenh - 2) break;`	328	`if (y == screenh - 2) break;`
330	`}`	329	`}`
331		330
332	`/* fill all lines below if empty (and they need to be redrawn) */`	331	`/* fill all lines below if empty (and they need to be redrawn) */`
333	`if (l == NULL) {`	332	`if (l == NULL) {`
334	`while ((y < screenh - 1) && (y < uidirty.to)) {`	333	`while ((y < screenh - 1) && (y < uidirty.to)) {`
335	`mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);`	334	`mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);`
336	`}`	335	`}`
337	`}`	336	`}`
338		337
339	`/* "file changed" flag */`	338	`/* "file changed" flag */`
340	`{`	339	`{`
341	`char flg = ' ';`	340	`char flg = ' ';`
342	`if (db->modflag) flg = '*';`	341	`if (db->modflag) flg = '*';`
343	`mdr_cout_char(screenh - 1, 0, flg, SCHEME_STBAR1);`	342	`mdr_cout_char(screenh - 1, 0, flg, SCHEME_STBAR1);`
344	`}`	343	`}`
345		344
346	`/* scroll bar */`	345	`/* scroll bar */`
347	`for (y = 0; y < (screenh - 1); y++) {`	346	`for (y = 0; y < (screenh - 1); y++) {`
348	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);`	347	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);`
349	`}`	348	`}`
350		349
351	`/* scroll cursor */`	350	`/* scroll cursor */`
352	`if (db->totlines >= screenh) {`	351	`if (db->totlines >= screenh) {`
353	`unsigned short topline = db->curline - db->cursorposy;`	352	`unsigned short topline = db->curline - db->cursorposy;`
354	`unsigned short col;`	353	`unsigned short col;`
355	`unsigned short totlines = db->totlines - screenh + 1;`	354	`unsigned short totlines = db->totlines - screenh + 1;`
356	`if (db->totlines - screenh > screenh) {`	355	`if (db->totlines - screenh > screenh) {`
357	`col = topline / (totlines / (screenh - 1));`	356	`col = topline / (totlines / (screenh - 1));`
358	`} else {`	357	`} else {`
359	`col = topline * (screenh - 1) / totlines;`	358	`col = topline * (screenh - 1) / totlines;`
360	`}`	359	`}`
361	`if (col >= screenh - 1) col = screenh - 2;`	360	`if (col >= screenh - 1) col = screenh - 2;`
362	`mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);`	361	`mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);`
363	`}`	362	`}`
364	`}`	363	`}`
365		364
366		365
367	`static void check_cursor_not_after_eol(struct file *db) {`	366	`static void check_cursor_not_after_eol(struct file *db) {`
368	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	367	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
369		368
370	`if (db->cursor->len < db->xoffset) {`	369	`if (db->cursor->len < db->xoffset) {`
371	`db->cursorposx = 0;`	370	`db->cursorposx = 0;`
372	`db->xoffset = db->cursor->len;`	371	`db->xoffset = db->cursor->len;`
373	`uidirty.from = 0;`	372	`uidirty.from = 0;`
374	`uidirty.to = 0xff;`	373	`uidirty.to = 0xff;`
375	`} else {`	374	`} else {`
376	`db->cursorposx = db->cursor->len - db->xoffset;`	375	`db->cursorposx = db->cursor->len - db->xoffset;`
377	`}`	376	`}`
378	`}`	377	`}`
379		378
380		379
381	`static void cursor_up(struct file *db) {`	380	`static void cursor_up(struct file *db) {`
382	`if (db->cursor->prev != NULL) {`	381	`if (db->cursor->prev != NULL) {`
383	`db->curline -= 1;`	382	`db->curline -= 1;`
384	`db->cursor = db->cursor->prev;`	383	`db->cursor = db->cursor->prev;`
385	`if (db->cursorposy == 0) {`	384	`if (db->cursorposy == 0) {`
386	`uidirty.from = 0;`	385	`uidirty.from = 0;`
387	`uidirty.to = 0xff;`	386	`uidirty.to = 0xff;`
388	`} else {`	387	`} else {`
389	`db->cursorposy -= 1;`	388	`db->cursorposy -= 1;`
390	`}`	389	`}`
391	`}`	390	`}`
392	`}`	391	`}`
393		392
394		393
395	`static void cursor_eol(struct file *db) {`	394	`static void cursor_eol(struct file *db) {`
396	`/* adjust xoffset to make sure eol is visible on screen */`	395	`/* adjust xoffset to make sure eol is visible on screen */`
397	`if (db->xoffset > db->cursor->len) {`	396	`if (db->xoffset > db->cursor->len) {`
398	`db->xoffset = db->cursor->len - 1;`	397	`db->xoffset = db->cursor->len - 1;`
399	`uidirty.from = 0;`	398	`uidirty.from = 0;`
400	`uidirty.to = 0xff;`	399	`uidirty.to = 0xff;`
401	`}`	400	`}`
402		401
403	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	402	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
404	`db->xoffset = db->cursor->len - screenw + 2;`	403	`db->xoffset = db->cursor->len - screenw + 2;`
405	`uidirty.from = 0;`	404	`uidirty.from = 0;`
406	`uidirty.to = 0xff;`	405	`uidirty.to = 0xff;`
407	`}`	406	`}`
408	`db->cursorposx = db->cursor->len - db->xoffset;`	407	`db->cursorposx = db->cursor->len - db->xoffset;`
409	`}`	408	`}`
410		409
411		410
412	`static void cursor_down(struct file *db) {`	411	`static void cursor_down(struct file *db) {`
413	`if (db->cursor->next != NULL) {`	412	`if (db->cursor->next != NULL) {`
414	`db->curline += 1;`	413	`db->curline += 1;`
415	`db->cursor = db->cursor->next;`	414	`db->cursor = db->cursor->next;`
416	`if (db->cursorposy < screenh - 2) {`	415	`if (db->cursorposy < screenh - 2) {`
417	`db->cursorposy += 1;`	416	`db->cursorposy += 1;`
418	`} else {`	417	`} else {`
419	`uidirty.from = 0;`	418	`uidirty.from = 0;`
420	`uidirty.to = 0xff;`	419	`uidirty.to = 0xff;`
421	`}`	420	`}`
422	`}`	421	`}`
423	`}`	422	`}`
424		423
425		424
426	`static void cursor_left(struct file *db) {`	425	`static void cursor_left(struct file *db) {`
427	`if (db->cursorposx > 0) {`	426	`if (db->cursorposx > 0) {`
428	`db->cursorposx -= 1;`	427	`db->cursorposx -= 1;`
429	`} else if (db->xoffset > 0) {`	428	`} else if (db->xoffset > 0) {`
430	`db->xoffset -= 1;`	429	`db->xoffset -= 1;`
431	`uidirty.from = 0;`	430	`uidirty.from = 0;`
432	`uidirty.to = 0xff;`	431	`uidirty.to = 0xff;`
433	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	432	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
434	`cursor_up(db);`	433	`cursor_up(db);`
435	`cursor_eol(db);`	434	`cursor_eol(db);`
436	`}`	435	`}`
437	`}`	436	`}`
438		437
439		438
440	`static void cursor_home(struct file *db) {`	439	`static void cursor_home(struct file *db) {`
441	`db->cursorposx = 0;`	440	`db->cursorposx = 0;`
442	`if (db->xoffset != 0) {`	441	`if (db->xoffset != 0) {`
443	`db->xoffset = 0;`	442	`db->xoffset = 0;`
444	`uidirty.from = 0;`	443	`uidirty.from = 0;`
445	`uidirty.to = 0xff;`	444	`uidirty.to = 0xff;`
446	`}`	445	`}`
447	`}`	446	`}`
448		447
449		448
450	`static void cursor_right(struct file *db) {`	449	`static void cursor_right(struct file *db) {`
451	`if (db->cursor->len > db->xoffset + db->cursorposx) {`	450	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
452	`if (db->cursorposx < screenw - 2) {`	451	`if (db->cursorposx < screenw - 2) {`
453	`db->cursorposx += 1;`	452	`db->cursorposx += 1;`
454	`} else {`	453	`} else {`
455	`db->xoffset += 1;`	454	`db->xoffset += 1;`
456	`uidirty.from = 0;`	455	`uidirty.from = 0;`
457	`uidirty.to = 0xff;`	456	`uidirty.to = 0xff;`
458	`}`	457	`}`
459	`} else {`	458	`} else {`
460	`cursor_down(db);`	459	`cursor_down(db);`
461	`cursor_home(db);`	460	`cursor_home(db);`
462	`}`	461	`}`
463	`}`	462	`}`
464		463
465		464
466	`static void del(struct file *db) {`	465	`static void del(struct file *db) {`
467	`if (db->cursorposx + db->xoffset < db->cursor->len) {`	466	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
468	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`	467	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`
469	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	468	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
470	`uidirty.from = db->cursorposy;`	469	`uidirty.from = db->cursorposy;`
471	`uidirty.to = db->cursorposy;`	470	`uidirty.to = db->cursorposy;`
472	`db->modflag = 1;`	471	`db->modflag = 1;`
473	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	472	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`
474	`struct line far *nextline = db->cursor->next;`	473	`struct line far *nextline = db->cursor->next;`
475	`if (db->cursor->next->len > 0) {`	474	`if (db->cursor->next->len > 0) {`
476	`if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {`	475	`if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {`
477	`_fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	476	`_fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
478	`db->cursor->len += db->cursor->next->len;`	477	`db->cursor->len += db->cursor->next->len;`
479	`}`	478	`}`
480	`}`	479	`}`
481		480
482	`db->cursor->next = db->cursor->next->next;`	481	`db->cursor->next = db->cursor->next->next;`
483	`db->cursor->next->prev = db->cursor;`	482	`db->cursor->next->prev = db->cursor;`
484		483
485	`line_free(nextline);`	484	`line_free(nextline);`
486	`uidirty.from = db->cursorposy;`	485	`uidirty.from = db->cursorposy;`
487	`uidirty.to = 0xff;`	486	`uidirty.to = 0xff;`
488	`db->totlines -= 1;`	487	`db->totlines -= 1;`
489	`db->modflag = 1;`	488	`db->modflag = 1;`
490	`}`	489	`}`
491	`}`	490	`}`
492		491
493		492
494	`static void bkspc(struct file *db) {`	493	`static void bkspc(struct file *db) {`
495		494
496	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	495	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
497	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	496	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
498		497
499	`cursor_left(db);`	498	`cursor_left(db);`
500	`del(db);`	499	`del(db);`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1559 – Rev 1345 → 1346