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


/* Sved, the SvarDOS editor
 *
 * Copyright (C) 2023 Mateusz Viste
 *
 * Sved is released under the terms of the MIT license.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
 
#include <dos.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>   /* _fcalloc() */
 
#include "mdr\bios.h"
#include "mdr\cout.h"
#include "mdr\dos.h"
#include "mdr\keyb.h"
 
#include "svarlang\svarlang.h"
 
 
/*****************************************************************************
 * global variables and definitions                                          *
 *****************************************************************************/
#define COL_TXT        0
#define COL_STATUSBAR1 1
#define COL_STATUSBAR2 2
#define COL_STATUSBAR3 3
#define COL_SCROLLBAR  4
#define COL_MSG        5
#define COL_ERR        6
 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
static unsigned char scheme[] = {0x07, 0x70, 0x70, 0xf0, 0x70, 0x70, 0xf0};
 
static unsigned char screenw, screenh;
 
static struct {
    unsigned char from;
    unsigned char to;
} uidirty = {0, 0xff}; /* 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                                                                 *
 *****************************************************************************/
 
/* 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 = _fcalloc(1, sizeof(struct line) + 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;
  _fmemcpy(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[COL_STATUSBAR3], 40);
  mdr_cout_char_rep(y, x++, ' ', scheme[COL_STATUSBAR3], screenw - x);
 
  for (;;) {
    mdr_cout_locate(y, x + len);
    k = keyb_getkey();
 
    if (k == 0x1b) return; /* ESC */
 
    if (k == '\r') {
      s[len] = 0;
      return;
    }
 
    if ((k == 0x08) && (len > 0)) { /* BKSPC */
      len--;
      mdr_cout_char(y, x + len, ' ', scheme[COL_STATUSBAR3]);
      continue;
    }
 
    if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
      mdr_cout_char(y, x + len, k, scheme[COL_STATUSBAR3]);
      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) {
  struct line far *n;
  if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */
  n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);
  if (n == NULL) return(-1);
  f->cursor = n;
  _fmemcpy(f->cursor->payload + f->cursor->len, buf, len);
  f->cursor->len += len;
 
  /* rewire the linked list */
  if (f->cursor->next) f->cursor->next->prev = f->cursor;
  if (f->cursor->prev) f->cursor->prev->next = f->cursor;
 
  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 load_colorscheme(void) {
  scheme[COL_TXT] = 0x17;
  scheme[COL_STATUSBAR1] = 0x70;
  scheme[COL_STATUSBAR2] = 0x78;
  scheme[COL_STATUSBAR3] = 0xf0;
  scheme[COL_SCROLLBAR] = 0x70;
  scheme[COL_MSG] = 0xf0;
  scheme[COL_ERR] = 0x4f;
}
 
 
static void ui_basic(const struct file *db) {
  const char *s = svarlang_strid(0); /* HELP */
  unsigned char helpcol = screenw - (strlen(s) + 4);
 
  /* fill status bar with background (without modflag as it is refreshed by ui_refresh) */
  mdr_cout_char_rep(screenh - 1, 1, ' ', scheme[COL_STATUSBAR1], screenw - 1);
 
  /* filename */
  {
    const char *fn = db->fname;
    if (*fn == 0) fn = svarlang_str(0, 1);
    mdr_cout_str(screenh - 1, 1, fn, scheme[COL_STATUSBAR1], screenw);
  }
 
  /* eol type */
  {
    const char *eoltype = "CRLF";
    if (db->lfonly) eoltype = "LF";
    mdr_cout_str(screenh - 1, helpcol - 5, eoltype, scheme[COL_STATUSBAR1], 5);
  }
 
  mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);
  mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 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 void ui_help(void) {
#define MAXLINLEN 35
  unsigned short i, offset;
  offset = (screenw - MAXLINLEN + 2) >> 1;
  mdr_cout_cursor_hide();
  for (i = 2; i <= 15; i++) {
    mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);
  }
 
  mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);
  for (i = 0; i <= 4; i++) {
    mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);
  }
  mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);
 
  /* Press any key */
  mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);
 
  keyb_getkey();
  mdr_cout_cursor_show();
#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[COL_TXT]);
    }
 
    /* write empty spaces until end of line */
    if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);
 
#ifdef DBG_REFRESH
    mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);
#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[COL_TXT], screenw - 1);
    }
  }
 
  /* "file changed" flag */
  {
    char flg = ' ';
    if (db->modflag) flg = '*';
    mdr_cout_char(screenh - 1, 0, flg, scheme[COL_STATUSBAR1]);
  }
 
  /* scroll bar */
  for (y = 0; y < (screenh - 1); y++) {
    mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);
  }
 
  /* 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[COL_SCROLLBAR]);
  }
}
 
 
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) {
      void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);
      if (newptr != NULL) {
        db->cursor = newptr;
        _fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
        db->cursor->len += db->cursor->next->len;
      }
    }
    db->cursor->next = db->cursor->next->next;
    db->cursor->next->prev = db->cursor;
    if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
    _ffree(nextline);
    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]);
}
 
 
static struct file *loadfile(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;
  struct file *db;
 
  len = strlen(fname) + 1;
  db = calloc(1, sizeof(struct file));
  if (db == NULL) return(NULL);
  memcpy(db->fname, fname, len);
 
  if (*fname == 0) goto SKIPLOADING;
 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
    mdr_coutraw_puts("Failed to open file:");
    mdr_coutraw_puts(fname);
    free(db);
    return(NULL);
  }
 
  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)) {
      mdr_coutraw_puts("out of memory");
      free(db);
      db = NULL;
      break;
    }
 
    /* add a new line if necessary */
    if (eolfound) {
      if (line_add(db, NULL, 0) != 0) {
      /* TODO ERROR HANDLING */
        mdr_coutraw_puts("out of memory");
        free(db);
        db = NULL;
        break;
      }
      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 != NULL) {
    if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
    db_rewind(db);
  }
 
  return(db);
}
 
 
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) {
  struct line far *n;
  n = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + len);
  if (n != NULL) {
    unsigned short off = db->xoffset + db->cursorposx;
    db->modflag = 1;
    if (n->prev) n->prev->next = n;
    if (n->next) n->next->prev = n;
    db->cursor = n;
    _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);
    }
  }
}
 
 
int main(void) {
  const char *fname;
  struct file *db;
 
  {
    char nlspath[128], lang[8];
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
  }
 
  fname = parseargv();
 
  if (fname == NULL) {
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
    return(0);
  }
 
  /* load file */
  db = loadfile(fname);
  if (db == NULL) return(1);
 
  if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();
  ui_basic(db);
 
  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;
    }
#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[COL_STATUSBAR1], 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 */
      // TODO
 
    } else if (k == 0x151) { /* pgdown */
      // TODO
 
    } else if (k == 0x147) { /* home */
       cursor_home(db);
 
    } else if (k == 0x14F) { /* end */
       cursor_eol(db);
 
    } else if (k == 0x1B) { /* ESC */
      if (db->modflag == 0) break;
      /* if file has been modified then ask for confirmation */
      ui_msg(svarlang_str(0,4), svarlang_str(0,5), scheme[COL_MSG]);
      if (keyb_getkey() == '\r') break;
 
    } else if (k == 0x0D) { /* ENTER */
      unsigned short off = db->xoffset + db->cursorposx;
      /* add a new line */
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
        db->modflag = 1;
        db->cursor = db->cursor->prev; /* back to original line */
        db->curline -= 1;
        /* trim the line above */
        db->cursor->len = off;
        /* move cursor to the (new) line below */
        uidirty.from = db->cursorposy;
        uidirty.to = 0xff;
        cursor_down(db);
        cursor_home(db);
      } else {
        /* ERROR: OUT OF MEMORY */
      }
 
    } else if (k == 0x153) {  /* DEL */
      del(db);
 
    } else if (k == 0x008) { /* BKSPC */
      bkspc(db);
 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
      char c = k;
      insert_in_line(db, &c, 1);
 
    } else if (k == 0x009) { /* TAB */
      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 == 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[COL_MSG]);
        mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
      } else {
        ui_msg(svarlang_str(0, 3), NULL, scheme[COL_ERR]);
        mdr_bios_tickswait(36); /* 2s */
      }
 
      ui_basic(db);
      ui_refresh(db);
 
    } else if (k == 0x144) { /* F10 */
      db->modflag = 1;
      db->lfonly ^= 1;
      ui_basic(db);
 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
      for (;;) {
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
        cursor_right(db);
      }
      /* now skip to next non-space or end of file */
      for (;;) {
        cursor_right(db);
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
      }
 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
      cursor_left(db);
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
      for (;;) {
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
        cursor_left(db);
      }
      /* now skip to next space or start of file */
      for (;;) {
        cursor_left(db);
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
          cursor_right(db);
          break;
        }
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
      }
 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
      char buff[4];
      const char *HEX = "0123456789ABCDEF";
      buff[0] = HEX[(k >> 8) & 15];
      buff[1] = HEX[(k >> 4) & 15];
      buff[2] = HEX[k & 15];
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", scheme[COL_STATUSBAR1], 17);
      mdr_cout_str(screenh - 1, 17, buff, scheme[COL_STATUSBAR1], 3);
      keyb_getkey();
      break;
    }
  }
 
  mdr_cout_close();
 
  /* no need to free memory, DOS will do it for me */
 
  return(0);
}
 

Rev 1331	Rev 1332
1	`/* Sved, the SvarDOS editor`	1	`/* Sved, the SvarDOS editor`
2	`*`	2	`*`
3	`* Copyright (C) 2023 Mateusz Viste`	3	`* Copyright (C) 2023 Mateusz Viste`
4	`*`	4	`*`
5	`* Sved is released under the terms of the MIT license.`	5	`* Sved is released under the terms of the MIT license.`
6	`*`	6	`*`
7	`* Permission is hereby granted, free of charge, to any person obtaining a copy`	7	`* Permission is hereby granted, free of charge, to any person obtaining a copy`
8	`* of this software and associated documentation files (the "Software"), to`	8	`* of this software and associated documentation files (the "Software"), to`
9	`* deal in the Software without restriction, including without limitation the`	9	`* deal in the Software without restriction, including without limitation the`
10	`* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or`	10	`* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or`
11	`* sell copies of the Software, and to permit persons to whom the Software is`	11	`* sell copies of the Software, and to permit persons to whom the Software is`
12	`* furnished to do so, subject to the following conditions:`	12	`* furnished to do so, subject to the following conditions:`
13	`*`	13	`*`
14	`* The above copyright notice and this permission notice shall be included in`	14	`* The above copyright notice and this permission notice shall be included in`
15	`* all copies or substantial portions of the Software.`	15	`* all copies or substantial portions of the Software.`
16	`*`	16	`*`
17	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`	17	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`
18	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`	18	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`
19	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`	19	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`
20	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`	20	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`
21	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`	21	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`
22	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS`	22	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS`
23	`* IN THE SOFTWARE.`	23	`* IN THE SOFTWARE.`
24	`*/`	24	`*/`
25		25
26	`#include <dos.h>`	26	`#include <dos.h>`
27	`#include <fcntl.h>`	27	`#include <fcntl.h>`
28	`#include <stdlib.h>`	28	`#include <stdlib.h>`
29	`#include <string.h>`	29	`#include <string.h>`
30	`#include <malloc.h> /* _fcalloc() */`	30	`#include <malloc.h> /* _fcalloc() */`
31		31
32	`#include "mdr\bios.h"`	32	`#include "mdr\bios.h"`
33	`#include "mdr\cout.h"`	33	`#include "mdr\cout.h"`
34	`#include "mdr\dos.h"`	34	`#include "mdr\dos.h"`
35	`#include "mdr\keyb.h"`	35	`#include "mdr\keyb.h"`
36		36
37	`#include "svarlang\svarlang.h"`	37	`#include "svarlang\svarlang.h"`
38		38
39		39
40	`/*****************************************************************************`	40	`/*****************************************************************************`
41	`* global variables and definitions *`	41	`* global variables and definitions *`
42	`*****************************************************************************/`	42	`*****************************************************************************/`
43	`#define COL_TXT 0`	43	`#define COL_TXT 0`
44	`#define COL_STATUSBAR1 1`	44	`#define COL_STATUSBAR1 1`
45	`#define COL_STATUSBAR2 2`	45	`#define COL_STATUSBAR2 2`
-		46	`#define COL_STATUSBAR3 3`
46	`#define COL_SCROLLBAR 3`	47	`#define COL_SCROLLBAR 4`
47	`#define COL_MSG 4`	48	`#define COL_MSG 5`
48	`#define COL_ERR 5`	49	`#define COL_ERR 6`
49		50
50	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`	51	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`
51	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70, 0x70, 0xf0};`	52	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0xf0, 0x70, 0x70, 0xf0};`
52		53
53	`static unsigned char screenw, screenh;`	54	`static unsigned char screenw, screenh;`
54		55
55	`static struct {`	56	`static struct {`
56	`unsigned char from;`	57	`unsigned char from;`
57	`unsigned char to;`	58	`unsigned char to;`
58	`} uidirty = {0, 0xff}; /* make sure to redraw entire UI at first run */`	59	`} uidirty = {0, 0xff}; /* make sure to redraw entire UI at first run */`
59		60
60	`#define SCROLL_CURSOR 0xB1`	61	`#define SCROLL_CURSOR 0xB1`
61		62
62	`struct line {`	63	`struct line {`
63	`struct line far *prev;`	64	`struct line far *prev;`
64	`struct line far *next;`	65	`struct line far *next;`
65	`unsigned short len;`	66	`unsigned short len;`
66	`char payload[1];`	67	`char payload[1];`
67	`};`	68	`};`
68		69
69	`struct file {`	70	`struct file {`
70	`int fd;`	71	`int fd;`
71	`struct line far *cursor;`	72	`struct line far *cursor;`
72	`unsigned short xoffset;`	73	`unsigned short xoffset;`
73	`unsigned char cursorposx;`	74	`unsigned char cursorposx;`
74	`unsigned char cursorposy;`	75	`unsigned char cursorposy;`
75	`unsigned short totlines;`	76	`unsigned short totlines;`
76	`unsigned short curline;`	77	`unsigned short curline;`
77	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`	78	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`
78	`char modflag; /* non-zero if file has been modified since last save */`	79	`char modflag; /* non-zero if file has been modified since last save */`
79	`char fname[1]; /* dynamically sized */`	80	`char fname[128];`
80	`};`	81	`};`
81		82
82		83
83	`/*****************************************************************************`	84	`/*****************************************************************************`
84	`* functions *`	85	`* functions *`
85	`*****************************************************************************/`	86	`*****************************************************************************/`
86		87
87	`/* adds a new line at cursor position into file linked list and advance cursor`	88	`/* adds a new line at cursor position into file linked list and advance cursor`
88	`* returns non-zero on error */`	89	`* returns non-zero on error */`
89	`static int line_add(struct file db, const char far line, unsigned short slen) {`	90	`static int line_add(struct file db, const char far line, unsigned short slen) {`
90	`struct line far *l;`	91	`struct line far *l;`
91		92
92	`l = _fcalloc(1, sizeof(struct line) + slen);`	93	`l = _fcalloc(1, sizeof(struct line) + slen);`
93	`if (l == NULL) return(-1);`	94	`if (l == NULL) return(-1);`
94		95
95	`l->prev = db->cursor;`	96	`l->prev = db->cursor;`
96	`if (db->cursor) {`	97	`if (db->cursor) {`
97	`l->next = db->cursor->next;`	98	`l->next = db->cursor->next;`
98	`db->cursor->next = l;`	99	`db->cursor->next = l;`
99	`l->next->prev = l;`	100	`l->next->prev = l;`
100	`}`	101	`}`
101	`db->cursor = l;`	102	`db->cursor = l;`
102	`_fmemcpy(l->payload, line, slen);`	103	`_fmemcpy(l->payload, line, slen);`
103	`l->len = slen;`	104	`l->len = slen;`
104		105
105	`db->totlines += 1;`	106	`db->totlines += 1;`
106	`db->curline += 1;`	107	`db->curline += 1;`
107		108
108	`return(0);`	109	`return(0);`
109	`}`	110	`}`
110		111
111		112
-		113	`static void ui_getstring(const char query, char s, unsigned char maxlen) {`
-		114	`unsigned char len = 0, y, x;`
-		115	`int k;`
-		116
-		117	`if (maxlen == 0) return;`
-		118	`maxlen--; /* make room for the nul terminator */`
-		119
-		120	`y = screenh - 1;`
-		121
-		122	`/* print query string */`
-		123	`x = mdr_cout_str(y, 0, query, scheme[COL_STATUSBAR3], 40);`
-		124	`mdr_cout_char_rep(y, x++, ' ', scheme[COL_STATUSBAR3], screenw - x);`
-		125
-		126	`for (;;) {`
-		127	`mdr_cout_locate(y, x + len);`
-		128	`k = keyb_getkey();`
-		129
-		130	`if (k == 0x1b) return; /* ESC */`
-		131
-		132	`if (k == '\r') {`
-		133	`s[len] = 0;`
-		134	`return;`
-		135	`}`
-		136
-		137	`if ((k == 0x08) && (len > 0)) { /* BKSPC */`
-		138	`len--;`
-		139	`mdr_cout_char(y, x + len, ' ', scheme[COL_STATUSBAR3]);`
-		140	`continue;`
-		141	`}`
-		142
-		143	`if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {`
-		144	`mdr_cout_char(y, x + len, k, scheme[COL_STATUSBAR3]);`
-		145	`s[len++] = k;`
-		146	`}`
-		147
-		148	`}`
-		149	`}`
-		150
-		151
112	`/* append a nul-terminated string to line at cursor position */`	152	`/* append a nul-terminated string to line at cursor position */`
113	`static int line_append(struct file f, const char far buf, unsigned short len) {`	153	`static int line_append(struct file f, const char far buf, unsigned short len) {`
114	`struct line far *n;`	154	`struct line far *n;`
115	`if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */`	155	`if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */`
116	`n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);`	156	`n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);`
117	`if (n == NULL) return(-1);`	157	`if (n == NULL) return(-1);`
118	`f->cursor = n;`	158	`f->cursor = n;`
119	`_fmemcpy(f->cursor->payload + f->cursor->len, buf, len);`	159	`_fmemcpy(f->cursor->payload + f->cursor->len, buf, len);`
120	`f->cursor->len += len;`	160	`f->cursor->len += len;`
121		161
122	`/* rewire the linked list */`	162	`/* rewire the linked list */`
123	`if (f->cursor->next) f->cursor->next->prev = f->cursor;`	163	`if (f->cursor->next) f->cursor->next->prev = f->cursor;`
124	`if (f->cursor->prev) f->cursor->prev->next = f->cursor;`	164	`if (f->cursor->prev) f->cursor->prev->next = f->cursor;`
125		165
126	`return(0);`	166	`return(0);`
127	`}`	167	`}`
128		168
129		169
130	`static void db_rewind(struct file *db) {`	170	`static void db_rewind(struct file *db) {`
131	`if (db->cursor == NULL) return;`	171	`if (db->cursor == NULL) return;`
132	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	172	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
133	`db->curline = 0;`	173	`db->curline = 0;`
134	`}`	174	`}`
135		175
136		176
137	`static void load_colorscheme(void) {`	177	`static void load_colorscheme(void) {`
138	`scheme[COL_TXT] = 0x17;`	178	`scheme[COL_TXT] = 0x17;`
139	`scheme[COL_STATUSBAR1] = 0x70;`	179	`scheme[COL_STATUSBAR1] = 0x70;`
140	`scheme[COL_STATUSBAR2] = 0x78;`	180	`scheme[COL_STATUSBAR2] = 0x78;`
-		181	`scheme[COL_STATUSBAR3] = 0xf0;`
141	`scheme[COL_SCROLLBAR] = 0x70;`	182	`scheme[COL_SCROLLBAR] = 0x70;`
142	`scheme[COL_MSG] = 0xf0;`	183	`scheme[COL_MSG] = 0xf0;`
143	`scheme[COL_ERR] = 0x4f;`	184	`scheme[COL_ERR] = 0x4f;`
144	`}`	185	`}`
145		186
146		187
147	`static void ui_basic(const struct file *db) {`	188	`static void ui_basic(const struct file *db) {`
148	`const char s = svarlang_strid(0); / HELP */`	189	`const char s = svarlang_strid(0); / HELP */`
149	`unsigned char helpcol = screenw - (strlen(s) + 4);`	190	`unsigned char helpcol = screenw - (strlen(s) + 4);`
150		191
151	`/* fill status bar with background (without modflag as it is refreshed by ui_refresh) */`	192	`/* fill status bar with background (without modflag as it is refreshed by ui_refresh) */`
152	`mdr_cout_char_rep(screenh - 1, 1, ' ', scheme[COL_STATUSBAR1], screenw - 1);`	193	`mdr_cout_char_rep(screenh - 1, 1, ' ', scheme[COL_STATUSBAR1], screenw - 1);`
153		194
154	`/* filename */`	195	`/* filename */`
155	`{`	196	`{`
156	`const char *fn = db->fname;`	197	`const char *fn = db->fname;`
157	`if (*fn == 0) fn = svarlang_str(0, 1);`	198	`if (*fn == 0) fn = svarlang_str(0, 1);`
158	`mdr_cout_str(screenh - 1, 1, fn, scheme[COL_STATUSBAR1], screenw);`	199	`mdr_cout_str(screenh - 1, 1, fn, scheme[COL_STATUSBAR1], screenw);`
159	`}`	200	`}`
160		201
161	`/* eol type */`	202	`/* eol type */`
162	`{`	203	`{`
163	`const char *eoltype = "CRLF";`	204	`const char *eoltype = "CRLF";`
164	`if (db->lfonly) eoltype = "LF";`	205	`if (db->lfonly) eoltype = "LF";`
165	`mdr_cout_str(screenh - 1, helpcol - 5, eoltype, scheme[COL_STATUSBAR1], 5);`	206	`mdr_cout_str(screenh - 1, helpcol - 5, eoltype, scheme[COL_STATUSBAR1], 5);`
166	`}`	207	`}`
167		208
168	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	209	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
169	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`	210	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`
170	`}`	211	`}`
171		212
172		213
173	`static void ui_msg(const char msg1, const char msg2, unsigned char attr) {`	214	`static void ui_msg(const char msg1, const char msg2, unsigned char attr) {`
174	`unsigned short x, y, msglen, i;`	215	`unsigned short x, y, msglen, i;`
175	`unsigned char msg2flag = 0;`	216	`unsigned char msg2flag = 0;`
176		217
177	`msglen = strlen(msg1);`	218	`msglen = strlen(msg1);`
178	`if (msg2) {`	219	`if (msg2) {`
179	`msg2flag = 1;`	220	`msg2flag = 1;`
180	`i = strlen(msg2);`	221	`i = strlen(msg2);`
181	`if (i > msglen) msglen = i;`	222	`if (i > msglen) msglen = i;`
182	`}`	223	`}`
183		224
184	`y = (screenh - 6) >> 1;`	225	`y = (screenh - 6) >> 1;`
185	`x = (screenw - msglen - 4) >> 1;`	226	`x = (screenw - msglen - 4) >> 1;`
186	`for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`	227	`for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`
187	`x++;`	228	`x++;`
188	`mdr_cout_str(y+1, x, msg1, attr, msglen);`	229	`mdr_cout_str(y+1, x, msg1, attr, msglen);`
189	`if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);`	230	`if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);`
190		231
191	`if (uidirty.from > y) uidirty.from = y;`	232	`if (uidirty.from > y) uidirty.from = y;`
192	`if (uidirty.to < y+4) uidirty.to = y+4;`	233	`if (uidirty.to < y+4) uidirty.to = y+4;`
193	`}`	234	`}`
194		235
195		236
196	`static void ui_help(void) {`	237	`static void ui_help(void) {`
197	`#define MAXLINLEN 35`	238	`#define MAXLINLEN 35`
198	`unsigned short i, offset;`	239	`unsigned short i, offset;`
199	`offset = (screenw - MAXLINLEN + 2) >> 1;`	240	`offset = (screenw - MAXLINLEN + 2) >> 1;`
200	`mdr_cout_cursor_hide();`	241	`mdr_cout_cursor_hide();`
201	`for (i = 2; i <= 15; i++) {`	242	`for (i = 2; i <= 15; i++) {`
202	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);`	243	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);`
203	`}`	244	`}`
204		245
205	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`	246	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`
206	`for (i = 0; i <= 4; i++) {`	247	`for (i = 0; i <= 4; i++) {`
207	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`	248	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`
208	`}`	249	`}`
209	`mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`	250	`mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`
210		251
211	`/* Press any key */`	252	`/* Press any key */`
212	`mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`	253	`mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`
213		254
214	`keyb_getkey();`	255	`keyb_getkey();`
215	`mdr_cout_cursor_show();`	256	`mdr_cout_cursor_show();`
216	`#undef MAXLINLEN`	257	`#undef MAXLINLEN`
217	`}`	258	`}`
218		259
219		260
220	`static void ui_refresh(const struct file *db) {`	261	`static void ui_refresh(const struct file *db) {`
221	`unsigned char x;`	262	`unsigned char x;`
222	`const struct line far *l;`	263	`const struct line far *l;`
223	`unsigned char y = db->cursorposy;`	264	`unsigned char y = db->cursorposy;`
224		265
225	`#ifdef DBG_REFRESH`	266	`#ifdef DBG_REFRESH`
226	`static char m = 'a';`	267	`static char m = 'a';`
227	`m++;`	268	`m++;`
228	`if (m > 'z') m = 'a';`	269	`if (m > 'z') m = 'a';`
229	`#endif`	270	`#endif`
230		271
231	`/* rewind cursor line to first line that needs redrawing */`	272	`/* rewind cursor line to first line that needs redrawing */`
232	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`	273	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`
233		274
234	`/* iterate over lines and redraw whatever needs to be redrawn */`	275	`/* iterate over lines and redraw whatever needs to be redrawn */`
235	`for (; l != NULL; l = l->next, y++) {`	276	`for (; l != NULL; l = l->next, y++) {`
236		277
237	`/* skip lines that do not need to be refreshed */`	278	`/* skip lines that do not need to be refreshed */`
238	`if (y < uidirty.from) continue;`	279	`if (y < uidirty.from) continue;`
239	`if (y > uidirty.to) break;`	280	`if (y > uidirty.to) break;`
240		281
241	`x = 0;`	282	`x = 0;`
242	`if (db->xoffset < l->len) {`	283	`if (db->xoffset < l->len) {`
243	`unsigned char i, limit;`	284	`unsigned char i, limit;`
244	`if (l->len - db->xoffset < screenw) {`	285	`if (l->len - db->xoffset < screenw) {`
245	`limit = l->len;`	286	`limit = l->len;`
246	`} else {`	287	`} else {`
247	`limit = db->xoffset + screenw - 1;`	288	`limit = db->xoffset + screenw - 1;`
248	`}`	289	`}`
249	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`	290	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`
250	`}`	291	`}`
251		292
252	`/* write empty spaces until end of line */`	293	`/* write empty spaces until end of line */`
253	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`	294	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`
254		295
255	`#ifdef DBG_REFRESH`	296	`#ifdef DBG_REFRESH`
256	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	297	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
257	`#endif`	298	`#endif`
258		299
259	`if (y == screenh - 2) break;`	300	`if (y == screenh - 2) break;`
260	`}`	301	`}`
261		302
262	`/* fill all lines below if empty (and they need to be redrawn) */`	303	`/* fill all lines below if empty (and they need to be redrawn) */`
263	`if (l == NULL) {`	304	`if (l == NULL) {`
264	`while ((y < screenh - 1) && (y < uidirty.to)) {`	305	`while ((y < screenh - 1) && (y < uidirty.to)) {`
265	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`	306	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`
266	`}`	307	`}`
267	`}`	308	`}`
268		309
269	`/* "file changed" flag */`	310	`/* "file changed" flag */`
270	`{`	311	`{`
271	`char flg = ' ';`	312	`char flg = ' ';`
272	`if (db->modflag) flg = '*';`	313	`if (db->modflag) flg = '*';`
273	`mdr_cout_char(screenh - 1, 0, flg, scheme[COL_STATUSBAR1]);`	314	`mdr_cout_char(screenh - 1, 0, flg, scheme[COL_STATUSBAR1]);`
274	`}`	315	`}`
275		316
276	`/* scroll bar */`	317	`/* scroll bar */`
277	`for (y = 0; y < (screenh - 1); y++) {`	318	`for (y = 0; y < (screenh - 1); y++) {`
278	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	319	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
279	`}`	320	`}`
280		321
281	`/* scroll cursor */`	322	`/* scroll cursor */`
282	`if (db->totlines >= screenh) {`	323	`if (db->totlines >= screenh) {`
283	`unsigned short topline = db->curline - db->cursorposy;`	324	`unsigned short topline = db->curline - db->cursorposy;`
284	`unsigned short col;`	325	`unsigned short col;`
285	`unsigned short totlines = db->totlines - screenh + 1;`	326	`unsigned short totlines = db->totlines - screenh + 1;`
286	`if (db->totlines - screenh > screenh) {`	327	`if (db->totlines - screenh > screenh) {`
287	`col = topline / (totlines / (screenh - 1));`	328	`col = topline / (totlines / (screenh - 1));`
288	`} else {`	329	`} else {`
289	`col = topline * (screenh - 1) / totlines;`	330	`col = topline * (screenh - 1) / totlines;`
290	`}`	331	`}`
291	`if (col >= screenh - 1) col = screenh - 2;`	332	`if (col >= screenh - 1) col = screenh - 2;`
292	`mdr_cout_char(col, screenw - 1, ' ', scheme[COL_SCROLLBAR]);`	333	`mdr_cout_char(col, screenw - 1, ' ', scheme[COL_SCROLLBAR]);`
293	`}`	334	`}`
294	`}`	335	`}`
295		336
296		337
297	`static void check_cursor_not_after_eol(struct file *db) {`	338	`static void check_cursor_not_after_eol(struct file *db) {`
298	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	339	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
299		340
300	`if (db->cursor->len < db->xoffset) {`	341	`if (db->cursor->len < db->xoffset) {`
301	`db->cursorposx = 0;`	342	`db->cursorposx = 0;`
302	`db->xoffset = db->cursor->len;`	343	`db->xoffset = db->cursor->len;`
303	`uidirty.from = 0;`	344	`uidirty.from = 0;`
304	`uidirty.to = 0xff;`	345	`uidirty.to = 0xff;`
305	`} else {`	346	`} else {`
306	`db->cursorposx = db->cursor->len - db->xoffset;`	347	`db->cursorposx = db->cursor->len - db->xoffset;`
307	`}`	348	`}`
308	`}`	349	`}`
309		350
310		351
311	`static void cursor_up(struct file *db) {`	352	`static void cursor_up(struct file *db) {`
312	`if (db->cursor->prev != NULL) {`	353	`if (db->cursor->prev != NULL) {`
313	`db->curline -= 1;`	354	`db->curline -= 1;`
314	`db->cursor = db->cursor->prev;`	355	`db->cursor = db->cursor->prev;`
315	`if (db->cursorposy == 0) {`	356	`if (db->cursorposy == 0) {`
316	`uidirty.from = 0;`	357	`uidirty.from = 0;`
317	`uidirty.to = 0xff;`	358	`uidirty.to = 0xff;`
318	`} else {`	359	`} else {`
319	`db->cursorposy -= 1;`	360	`db->cursorposy -= 1;`
320	`}`	361	`}`
321	`}`	362	`}`
322	`}`	363	`}`
323		364
324		365
325	`static void cursor_eol(struct file *db) {`	366	`static void cursor_eol(struct file *db) {`
326	`/* adjust xoffset to make sure eol is visible on screen */`	367	`/* adjust xoffset to make sure eol is visible on screen */`
327	`if (db->xoffset > db->cursor->len) {`	368	`if (db->xoffset > db->cursor->len) {`
328	`db->xoffset = db->cursor->len - 1;`	369	`db->xoffset = db->cursor->len - 1;`
329	`uidirty.from = 0;`	370	`uidirty.from = 0;`
330	`uidirty.to = 0xff;`	371	`uidirty.to = 0xff;`
331	`}`	372	`}`
332		373
333	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	374	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
334	`db->xoffset = db->cursor->len - screenw + 2;`	375	`db->xoffset = db->cursor->len - screenw + 2;`
335	`uidirty.from = 0;`	376	`uidirty.from = 0;`
336	`uidirty.to = 0xff;`	377	`uidirty.to = 0xff;`
337	`}`	378	`}`
338	`db->cursorposx = db->cursor->len - db->xoffset;`	379	`db->cursorposx = db->cursor->len - db->xoffset;`
339	`}`	380	`}`
340		381
341		382
342	`static void cursor_down(struct file *db) {`	383	`static void cursor_down(struct file *db) {`
343	`if (db->cursor->next != NULL) {`	384	`if (db->cursor->next != NULL) {`
344	`db->curline += 1;`	385	`db->curline += 1;`
345	`db->cursor = db->cursor->next;`	386	`db->cursor = db->cursor->next;`
346	`if (db->cursorposy < screenh - 2) {`	387	`if (db->cursorposy < screenh - 2) {`
347	`db->cursorposy += 1;`	388	`db->cursorposy += 1;`
348	`} else {`	389	`} else {`
349	`uidirty.from = 0;`	390	`uidirty.from = 0;`
350	`uidirty.to = 0xff;`	391	`uidirty.to = 0xff;`
351	`}`	392	`}`
352	`}`	393	`}`
353	`}`	394	`}`
354		395
355		396
356	`static void cursor_left(struct file *db) {`	397	`static void cursor_left(struct file *db) {`
357	`if (db->cursorposx > 0) {`	398	`if (db->cursorposx > 0) {`
358	`db->cursorposx -= 1;`	399	`db->cursorposx -= 1;`
359	`} else if (db->xoffset > 0) {`	400	`} else if (db->xoffset > 0) {`
360	`db->xoffset -= 1;`	401	`db->xoffset -= 1;`
361	`uidirty.from = 0;`	402	`uidirty.from = 0;`
362	`uidirty.to = 0xff;`	403	`uidirty.to = 0xff;`
363	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	404	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
364	`cursor_up(db);`	405	`cursor_up(db);`
365	`cursor_eol(db);`	406	`cursor_eol(db);`
366	`}`	407	`}`
367	`}`	408	`}`
368		409
369		410
370	`static void cursor_home(struct file *db) {`	411	`static void cursor_home(struct file *db) {`
371	`db->cursorposx = 0;`	412	`db->cursorposx = 0;`
372	`if (db->xoffset != 0) {`	413	`if (db->xoffset != 0) {`
373	`db->xoffset = 0;`	414	`db->xoffset = 0;`
374	`uidirty.from = 0;`	415	`uidirty.from = 0;`
375	`uidirty.to = 0xff;`	416	`uidirty.to = 0xff;`
376	`}`	417	`}`
377	`}`	418	`}`
378		419
379		420
380	`static void cursor_right(struct file *db) {`	421	`static void cursor_right(struct file *db) {`
381	`if (db->cursor->len > db->xoffset + db->cursorposx) {`	422	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
382	`if (db->cursorposx < screenw - 2) {`	423	`if (db->cursorposx < screenw - 2) {`
383	`db->cursorposx += 1;`	424	`db->cursorposx += 1;`
384	`} else {`	425	`} else {`
385	`db->xoffset += 1;`	426	`db->xoffset += 1;`
386	`uidirty.from = 0;`	427	`uidirty.from = 0;`
387	`uidirty.to = 0xff;`	428	`uidirty.to = 0xff;`
388	`}`	429	`}`
389	`} else {`	430	`} else {`
390	`cursor_down(db);`	431	`cursor_down(db);`
391	`cursor_home(db);`	432	`cursor_home(db);`
392	`}`	433	`}`
393	`}`	434	`}`
394		435
395		436
396	`static void del(struct file *db) {`	437	`static void del(struct file *db) {`
397	`if (db->cursorposx + db->xoffset < db->cursor->len) {`	438	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
398	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`	439	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`
399	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	440	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
400	`uidirty.from = db->cursorposy;`	441	`uidirty.from = db->cursorposy;`
401	`uidirty.to = db->cursorposy;`	442	`uidirty.to = db->cursorposy;`
402	`db->modflag = 1;`	443	`db->modflag = 1;`
403	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	444	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`
404	`struct line far *nextline = db->cursor->next;`	445	`struct line far *nextline = db->cursor->next;`
405	`if (db->cursor->next->len > 0) {`	446	`if (db->cursor->next->len > 0) {`
406	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	447	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
407	`if (newptr != NULL) {`	448	`if (newptr != NULL) {`
408	`db->cursor = newptr;`	449	`db->cursor = newptr;`
409	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	450	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
410	`db->cursor->len += db->cursor->next->len;`	451	`db->cursor->len += db->cursor->next->len;`
411	`}`	452	`}`
412	`}`	453	`}`
413	`db->cursor->next = db->cursor->next->next;`	454	`db->cursor->next = db->cursor->next->next;`
414	`db->cursor->next->prev = db->cursor;`	455	`db->cursor->next->prev = db->cursor;`
415	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	456	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
416	`_ffree(nextline);`	457	`_ffree(nextline);`
417	`uidirty.from = db->cursorposy;`	458	`uidirty.from = db->cursorposy;`
418	`uidirty.to = 0xff;`	459	`uidirty.to = 0xff;`
419	`db->totlines -= 1;`	460	`db->totlines -= 1;`
420	`db->modflag = 1;`	461	`db->modflag = 1;`
421	`}`	462	`}`
422	`}`	463	`}`
423		464
424		465
425	`static void bkspc(struct file *db) {`	466	`static void bkspc(struct file *db) {`
426		467
427	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	468	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
428	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	469	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
429		470
430	`cursor_left(db);`	471	`cursor_left(db);`
431	`del(db);`	472	`del(db);`
432	`}`	473	`}`
433		474
434		475
435	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	476	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
436	`* of argc and argv, saves some 330 bytes of binary size */`	477	`* of argc and argv, saves some 330 bytes of binary size */`
437	`static char *parseargv(void) {`	478	`static char *parseargv(void) {`
438	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	479	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
439	`unsigned char count = 0;`	480	`unsigned char count = 0;`
440	`char *argv[4];`	481	`char *argv[4];`
441		482
442	`while (count < 4) {`	483	`while (count < 4) {`
443	`/* jump to nearest arg */`	484	`/* jump to nearest arg */`
444	`while (*tail == ' ') {`	485	`while (*tail == ' ') {`
445	`*tail = 0;`	486	`*tail = 0;`
446	`tail++;`	487	`tail++;`
447	`}`	488	`}`
448		489
449	`if (*tail == '\r') {`	490	`if (*tail == '\r') {`
450	`*tail = 0;`	491	`*tail = 0;`
451	`break;`	492	`break;`
452	`}`	493	`}`
453		494
454	`argv[count++] = tail;`	495	`argv[count++] = tail;`
455		496
456	`/* jump to next delimiter */`	497	`/* jump to next delimiter */`
457	`while ((tail != ' ') && (tail != '\r')) tail++;`	498	`while ((tail != ' ') && (tail != '\r')) tail++;`
458	`}`	499	`}`
459		500

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1538 – Rev 1331 → 1332