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_MENU   = 0x70,
                     SCHEME_MENU_CUR= 0x0f,
                     SCHEME_MENU_SEL= 0x00,
                     SCHEME_STBAR1 = 0x70,
                     SCHEME_STBAR2 = 0x70,
                     SCHEME_STBAR3 = 0xf0,
                     SCHEME_SCROLL = 0x70,
                     SCHEME_MSG    = 0x70,
                     SCHEME_ERR    = 0xf0;
 
static unsigned char screenw, screenh;
 
static struct {
    unsigned char from;
    unsigned char to;
    unsigned char statusbar;
} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */
 
#define SCROLL_CURSOR 0xB1
 
struct line {
  struct line far *prev;
  struct line far *next;
  unsigned short len;
  char payload[1];
};
 
struct file {
  struct line far *cursor;
  unsigned short xoffset;
  unsigned short cursorposx;
  unsigned short cursorposy;
  unsigned short totlines;
  unsigned short curline;
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
  char modflag;  /* non-zero if file has been modified since last save */
  char fname[128];
};
 
 
/*****************************************************************************
 * functions                                                                 *
 *****************************************************************************/
 
static struct line far *line_calloc(unsigned short siz) {
  struct line far *res;
  unsigned int seg;
  if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);
  res = MK_FP(seg, 0);
  _fmemset(res, 0, sizeof(struct line) + siz);
  return(MK_FP(seg, 0));
}
 
 
static void line_free(struct line far *ptr) {
  _dos_freemem(FP_SEG(ptr));
}
 
 
static int curline_resize(struct file far *db, unsigned short newsiz) {
  unsigned int maxavail;
  struct line far *newptr;
 
  /* try resizing the block (much faster) */
  if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);
 
  /* create a new block and copy data over */
  newptr = line_calloc(newsiz);
  if (newptr == NULL) return(-1);
  _fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
 
  /* rewire the linked list */
  db->cursor = newptr;
  if (newptr->next) newptr->next->prev = newptr;
  if (newptr->prev) newptr->prev->next = newptr;
 
  return(0);
}
 
 
/* adds a new line at cursor position into file linked list and advance cursor
 * returns non-zero on error */
static int line_add(struct file *db, const char far *line, unsigned short slen) {
  struct line far *l;
 
  l = line_calloc(slen);
  if (l == NULL) return(-1);
 
  l->prev = db->cursor;
  if (db->cursor) {
    l->next = db->cursor->next;
    db->cursor->next = l;
    l->next->prev = l;
  }
  db->cursor = l;
  if (slen > 0) {
    _fmemmove(l->payload, line, slen);
    l->len = slen;
  }
 
  db->totlines += 1;
  db->curline += 1;
 
  return(0);
}
 
 
static void ui_getstring(const char *query, char *s, unsigned short maxlen) {
  unsigned short len = 0;
  unsigned char y, x;
  int k;
 
  if (maxlen == 0) return;
  maxlen--; /* make room for the nul terminator */
 
  y = screenh - 1;
 
  /* print query string */
  x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);
  mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);
 
  for (;;) {
    mdr_cout_locate(y, x + len);
    k = keyb_getkey();
 
    switch (k) {
      case 0x1b: /* ESC */
        s[0] = 0;
        return;
      case '\r':
        s[len] = 0;
        return;
      case 0x08: /* BKSPC */
        if (len > 0) {
          len--;
          mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);
        }
        break;
      default:
        if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
          mdr_cout_char(y, x + len, k, SCHEME_STBAR3);
          s[len++] = k;
        }
    }
  }
 
}
 
 
/* append a nul-terminated string to line at cursor position */
static int line_append(struct file *f, const char far *buf, unsigned short len) {
  if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */
  if (curline_resize(f, f->cursor->len + len) != 0) return(-1);
  _fmemmove(f->cursor->payload + f->cursor->len, buf, len);
  f->cursor->len += len;
 
  return(0);
}
 
 
static void db_rewind(struct file *db) {
  if (db->cursor == NULL) return;
  while (db->cursor->prev) db->cursor = db->cursor->prev;
  db->curline = 0;
}
 
 
static void ui_basic(const struct file *db) {
  const char *s = svarlang_strid(0); /* HELP */
  unsigned short helpcol = screenw - strlen(s);
 
  /* fill status bar with background (without modflag as it is refreshed by ui_refresh) */
  mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);
 
  /* filename */
  {
    const char *fn = db->fname;
    if (*fn == 0) fn = svarlang_str(0, 1);
    mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);
  }
 
  /* eol type */
  {
    const char *eoltype = "CRLF";
    if (db->lfonly) eoltype += 2;
    mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);
  }
 
  mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);
}
 
 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
  unsigned short x, y, msglen, i;
  unsigned char msg2flag = 0;
 
  msglen = strlen(msg1);
  if (msg2) {
    msg2flag = 1;
    i = strlen(msg2);
    if (i > msglen) msglen = i;
  }
 
  y = (screenh - 6) >> 1;
  x = (screenw - msglen - 4) >> 1;
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
  x++;
 
  mdr_cout_str(y+1, x, msg1, attr, msglen);
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
 
  if (uidirty.from > y) uidirty.from = y;
  if (uidirty.to < y+4) uidirty.to = y+4;
}
 
 
static unsigned char ui_confirm_if_unsaved(struct file *db) {
  if (db->modflag == 0) return(0);
 
  /* if file has been modified then ask for confirmation */
  ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);
  if (keyb_getkey() == '\r') return(0);
 
  return(1);
}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
static void ui_refresh(const struct file *db) {
  unsigned char x;
  const struct line far *l;
  unsigned char y = db->cursorposy;
 
#ifdef DBG_REFRESH
  static char m = 'a';
  m++;
  if (m > 'z') m = 'a';
#endif
 
  /* rewind cursor line to first line that needs redrawing */
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
 
  /* iterate over lines and redraw whatever needs to be redrawn */
  for (; l != NULL; l = l->next, y++) {
 
    /* skip lines that do not need to be refreshed */
    if (y < uidirty.from) continue;
    if (y > uidirty.to) break;
 
    x = 0;
    if (db->xoffset < l->len) {
      unsigned char i, limit;
      if (l->len - db->xoffset < screenw) {
        limit = l->len;
      } else {
        limit = db->xoffset + screenw - 1;
      }
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
    }
 
    /* write empty spaces until end of line */
    if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);
 
#ifdef DBG_REFRESH
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
#endif
 
    if (y == screenh - 2) break;
  }
 
  /* fill all lines below if empty (and they need to be redrawn) */
  if (l == NULL) {
    while ((y < screenh - 1) && (y < uidirty.to)) {
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);
    }
  }
 
  /* "file changed" flag */
  mdr_cout_char(screenh - 1, 0, db->modflag, SCHEME_STBAR1);
 
  /* scroll bar */
  for (y = 0; y < (screenh - 1); y++) {
    mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);
  }
 
  /* scroll cursor */
  if (db->totlines >= screenh) {
    unsigned short topline = db->curline - db->cursorposy;
    unsigned short col;
    unsigned short totlines = db->totlines - screenh + 1;
    if (db->totlines - screenh > screenh) {
      col = topline / (totlines / (screenh - 1));
    } else {
      col = topline * (screenh - 1) / totlines;
    }
    if (col >= screenh - 1) col = screenh - 2;
    mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);
  }
}
 
 
static void check_cursor_not_after_eol(struct file *db) {
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
 
  if (db->cursor->len < db->xoffset) {
    db->cursorposx = 0;
    db->xoffset = db->cursor->len;
    uidirty.from = 0;
    uidirty.to = 0xff;
  } else {
    db->cursorposx = db->cursor->len - db->xoffset;
  }
}
 
 
static void cursor_up(struct file *db) {
  if (db->cursor->prev != NULL) {
    db->curline -= 1;
    db->cursor = db->cursor->prev;
    if (db->cursorposy == 0) {
      uidirty.from = 0;
      uidirty.to = 0xff;
    } else {
      db->cursorposy -= 1;
    }
  }
}
 
 
static void cursor_eol(struct file *db) {
  /* adjust xoffset to make sure eol is visible on screen */
  if (db->xoffset > db->cursor->len) {
    db->xoffset = db->cursor->len - 1;
    uidirty.from = 0;
    uidirty.to = 0xff;
  }
 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
    db->xoffset = db->cursor->len - screenw + 2;
    uidirty.from = 0;
    uidirty.to = 0xff;
  }
  db->cursorposx = db->cursor->len - db->xoffset;
}
 
 
static void cursor_down(struct file *db) {
  if (db->cursor->next != NULL) {
    db->curline += 1;
    db->cursor = db->cursor->next;
    if (db->cursorposy < screenh - 2) {
      db->cursorposy += 1;
    } else {
      uidirty.from = 0;
      uidirty.to = 0xff;
    }
  }
}
 
 
static void cursor_left(struct file *db) {
  if (db->cursorposx > 0) {
    db->cursorposx -= 1;
  } else if (db->xoffset > 0) {
    db->xoffset -= 1;
    uidirty.from = 0;
    uidirty.to = 0xff;
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
    cursor_up(db);
    cursor_eol(db);
  }
}
 
 
static void cursor_home(struct file *db) {
  db->cursorposx = 0;
  if (db->xoffset != 0) {
    db->xoffset = 0;
    uidirty.from = 0;
    uidirty.to = 0xff;
  }
}
 
 
static void cursor_right(struct file *db) {
  if (db->cursor->len > db->xoffset + db->cursorposx) {
    if (db->cursorposx < screenw - 2) {
      db->cursorposx += 1;
    } else {
      db->xoffset += 1;
      uidirty.from = 0;
      uidirty.to = 0xff;
    }
  } else {
    cursor_down(db);
    cursor_home(db);
  }
}
 
 
static void del(struct file *db) {
  if (db->cursorposx + db->xoffset < db->cursor->len) {
    _fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
    uidirty.from = db->cursorposy;
    uidirty.to = db->cursorposy;
    db->modflag = '*';
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
    struct line far *nextline = db->cursor->next;
    if (db->cursor->next->len > 0) {
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
        _fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
        db->cursor->len += db->cursor->next->len;
      }
    }
 
    db->cursor->next = db->cursor->next->next;
    db->cursor->next->prev = db->cursor;
 
    line_free(nextline);
    uidirty.from = db->cursorposy;
    uidirty.to = 0xff;
    db->totlines -= 1;
    db->modflag = '*';
  }
}
 
 
static void bkspc(struct file *db) {
 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
  if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
 
  cursor_left(db);
  del(db);
}
 
 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
 * of argc and argv, saves some 330 bytes of binary size */
static const char *parseargv(void) {
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
  unsigned short count = 0;
  char *argv[2];
 
  while (count < 2) {
    /* jump to nearest arg */
    while (*tail == ' ') {
      *tail = 0;
      tail++;
    }
 
    if (*tail == '\r') {
      *tail = 0;
      break;
    }
 
    argv[count++] = tail;
 
    /* jump to next delimiter */
    while ((*tail != ' ') && (*tail != '\r')) tail++;
  }
 
  /* check args now */
  if (count == 0) return("");
  if (count == 1) return(argv[0]);
 
  return(NULL);
}
 
 
/* returns 0 on success, 1 on file not found, 2 on other error */
static unsigned char loadfile(struct file *db, const char *fname) {
  char buff[512]; /* read one entire sector at a time (faster) */
  char *buffptr;
  unsigned int len, llen;
  int fd;
  unsigned char eolfound;
 
  bzero(db, sizeof(db));
  memcpy(db->fname, fname, strlen(fname));
 
  if (*fname == 0) goto SKIPLOADING;
 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
    return(1);
  }
 
  db->lfonly = 1;
 
  /* start by adding an empty line */
  if (line_add(db, NULL, 0) != 0) {
    /* TODO ERROR HANDLING */
  }
 
  for (eolfound = 0;;) {
    unsigned short consumedbytes;
 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
    buffptr = buff;
 
    FINDLINE:
 
    /* look for nearest \n */
    for (consumedbytes = 0;; consumedbytes++) {
      if (consumedbytes == len) {
        llen = consumedbytes;
        break;
      }
      if (buffptr[consumedbytes] == '\r') {
        llen = consumedbytes;
        consumedbytes++;
        db->lfonly = 0;
        break;
      }
      if (buffptr[consumedbytes] == '\n') {
        eolfound = 1;
        llen = consumedbytes;
        consumedbytes++;
        break;
      }
    }
 
    /* consumedbytes is the amount of bytes processed from buffptr,
     * llen is the length of line's payload (without its line terminator) */
 
    /* append content, if line is non-empty */
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
      goto IOERR;
    }
 
    /* add a new line if necessary */
    if (eolfound) {
      if (line_add(db, NULL, 0) != 0) {
        goto IOERR;
      }
      eolfound = 0;
    }
 
    /* anything left? process the buffer leftover again */
    if (consumedbytes < len) {
      len -= consumedbytes;
      buffptr += consumedbytes;
      goto FINDLINE;
    }
 
  }
 
  _dos_close(fd);
 
  SKIPLOADING:
 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
  if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
  db_rewind(db);
 
  return(0);
 
  IOERR:
  _dos_close(fd);
  return(2);
}
 
 
static int savefile(const struct file *db, const char *newfname) {
  int fd;
  const struct line far *l;
  unsigned bytes;
  unsigned char eollen;
  unsigned char eolbuf[2];
  int errflag = 0;
 
  /* either create a new file if newfname provided, or... */
  if (newfname) {
    if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
  } else { /* ...open db->fname */
    if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
  }
 
  l = db->cursor;
  while (l->prev) l = l->prev;
 
  /* preset line terminators */
  if (db->lfonly) {
    eolbuf[0] = '\n';
    eollen = 1;
  } else {
    eolbuf[0] = '\r';
    eolbuf[1] = '\n';
    eollen = 2;
  }
 
  while (l) {
    /* do not write the last empty line, it is only useful for edition */
    if (l->len != 0) {
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
    } else if (l->next == NULL) {
      break;
    }
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
    l = l->next;
  }
 
  errflag |= _dos_close(fd);
 
  return(errflag);
}
 
 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
  if (curline_resize(db, db->cursor->len + len) == 0) {
    unsigned short off = db->xoffset + db->cursorposx;
    db->modflag = '*';
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
    db->cursor->len += len;
    uidirty.from = db->cursorposy;
    uidirty.to = db->cursorposy;
    while (len--) {
      db->cursor->payload[off++] = *databuf;
      databuf++;
      cursor_right(db);
    }
  }
}
 
 
static void clear_file(struct file *db) {
 
  /* free the entire linked list of lines */
  db_rewind(db);
  while (db->cursor) {
    struct line far *victim;
    victim = db->cursor;
    db->cursor = db->cursor->next;
    line_free(victim);
  }
 
  /* zero out the struct */
  bzero(db, sizeof(struct file));
}
 
 
/* recompute db->curline by counting nodes in linked list */
static void recompute_curline(struct file *db) {
  const struct line far *l = db->cursor;
 
  db->curline = 0;
  while (l->prev != NULL) {
    db->curline += 1;
    l = l->prev;
  }
}
 
 
enum MENU_ACTION {
  MENU_NONE = 0,
  MENU_NEW = 1,
  MENU_OPEN = 2,
  MENU_SAVE = 3,
  MENU_SAVEAS = 4,
  MENU_CHGEOL = 5,
  MENU_QUIT = 6
};
 
static enum MENU_ACTION ui_menu(void) {
  unsigned short i, curchoice, attr, x, slen;
  uidirty.from = 0;
  uidirty.to = 0xff;
  uidirty.statusbar = 1;
 
  /* find out the longest string */
  slen = 0;
  for (i = MENU_NEW; i <= MENU_QUIT; i++) {
    x = strlen(svarlang_str(8, i));
    if (x > slen) slen = x;
  }
 
  curchoice = MENU_NEW;
  for (;;) {
    /* render menu */
    for (i = MENU_NONE; i <= MENU_QUIT + 1; i++) {
      mdr_cout_char_rep(i, 0, ' ', SCHEME_MENU, slen+4);
      if (i == curchoice) {
        attr = SCHEME_MENU_CUR;
        mdr_cout_char(i, 1, '>', SCHEME_MENU_SEL);
      } else {
        attr = SCHEME_MENU;
      }
      x = mdr_cout_str(i, 2, svarlang_str(8, i), attr, slen);
      if (i == curchoice) {
        mdr_cout_char_rep(i, x + 2, ' ', SCHEME_MENU_SEL, slen - x + 1);
        mdr_cout_locate(i, x + 2);
      }
    }
    /* wait for key */
    switch (keyb_getkey()) {
      case '\r': return(curchoice); /* ENTER */
      case 0x150: /* down */
        if (curchoice == MENU_QUIT) {
          curchoice = MENU_NEW;
        } else {
          curchoice++;
        }
        break;
      case 0x148: /* up */
        if (curchoice == MENU_NEW) {
          curchoice = MENU_QUIT;
        } else {
          curchoice--;
        }
        break;
      default: return(MENU_NONE);
    }
  }
}
 
 
/* main returns nothing, ie. sved always exits with a zero exit code
 * (this saves 20 bytes of executable footprint) */
void main(void) {
  static struct file dbarr[12];
  const char *fname;
  struct file *db = dbarr;
 
  {
    char nlspath[128], lang[8];
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
  }
 
  fname = parseargv();
 
  if ((fname == NULL) || (*fname == '/')) {
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
    return;
  }
 
  /* load file */
  {
    unsigned char err = loadfile(db, fname);
    if (err == 1) {
      mdr_coutraw_puts(svarlang_str(0,11)); /* file not found */
      return;
    } else if (err != 0) {
      mdr_coutraw_puts(svarlang_str(0,10)); /* ERROR */
      return;
    }
  }
 
  if (mdr_cout_init(&screenw, &screenh)) {
    /* load color scheme if mdr_cout_init returns a color flag */
    SCHEME_TEXT = 0x17;
    SCHEME_MENU = 0x70;
    SCHEME_MENU_CUR = 0x2f;
    SCHEME_MENU_SEL = 0x22;
    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 */
 
 
 
 
 
 
 
 
 
 
 
 
 
      int quitnow = 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
      char fname[25];
      int saveflag = 0;
 
      switch (ui_menu()) {
 
 
        case MENU_NONE:
          break;
 
 
 
        case MENU_NEW:
          if (ui_confirm_if_unsaved(db) == 0) {
            clear_file(db);
            /* add a single empty line */
            line_add(db, NULL, 0);
          }
 
 
          uidirty.statusbar = 1;
          break;
 
 
        case MENU_OPEN:
 
          /* display a warning if unsaved changes are pending */
          if (db->modflag != 0) ui_msg(svarlang_str(0,4), svarlang_str(0,8), SCHEME_MSG);
 
          /* ask for filename */
          ui_getstring(svarlang_str(0,7), fname, sizeof(fname));
          if (fname[0] != 0) {
            unsigned char err;
            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);
            }
          }
 
 
 
 
 
          break;
 
        case MENU_SAVEAS:
          saveflag = 1;
          /* FALLTHRU */
        case MENU_SAVE:
          if ((saveflag != 0) || (db->fname[0] == 0)) { /* save as... */
            ui_getstring(svarlang_str(0,6), fname, sizeof(fname));
            if (*fname == 0) break;
            saveflag = savefile(db, fname);
            if (saveflag == 0) memcpy(db->fname, fname, sizeof(fname));
          } else {
            saveflag = savefile(db, NULL);
          }
 
          if (saveflag == 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 */
          }
          break;
 
        case MENU_CHGEOL:
 
 
 
          db->modflag = '*';
          db->lfonly ^= 1;
          break;
 
        case MENU_QUIT:
          if (ui_confirm_if_unsaved(db) == 0) quitnow = 1;
          break;
      }
 
      if (quitnow) break;
 
    } else if (k == 0x0D) { /* ENTER */
      unsigned short off = db->xoffset + db->cursorposx;
      /* add a new line */
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
        db->modflag = '*';
        db->cursor = db->cursor->prev; /* back to original line */
        /* trim the line above */
        db->cursor->len = off;
        /* move cursor to the (new) line below */
        db->curline -= 1;
        uidirty.from = db->cursorposy;
        uidirty.to = 0xff;
        cursor_down(db);
        cursor_home(db);
      } else {
        /* ERROR: OUT OF MEMORY */
      }
 
    } else if (k == 0x153) {  /* DEL */
      del(db);
 
    } else if (k == 0x008) { /* BKSPC */
      bkspc(db);
 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
      char c = k;
      insert_in_line(db, &c, 1);
 
    } else if (k == 0x009) { /* TAB */
      insert_in_line(db, "        ", 8);
 
    } else if ((k >= 0x13b) && (k <= 0x146)) { /* F1..F12 */
      uidirty.from = 0;
      uidirty.to = 0xff;
 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
      for (;;) {
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
        cursor_right(db);
      }
      /* now skip to next non-space or end of file */
      for (;;) {
        cursor_right(db);
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
      }
 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
      cursor_left(db);
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
      for (;;) {
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
        cursor_left(db);
      }
      /* now skip to next space or start of file */
      for (;;) {
        cursor_left(db);
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
          cursor_right(db);
          break;
        }
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
      }
 
#ifdef DBG_UNHKEYS
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
      char buff[4];
      const char *HEX = "0123456789ABCDEF";
      buff[0] = HEX[(k >> 8) & 15];
      buff[1] = HEX[(k >> 4) & 15];
      buff[2] = HEX[k & 15];
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
      keyb_getkey();
      break;
#endif
    }
  }
 
  mdr_cout_close();
 
  /* no need to free memory, DOS will do it for me */
 
  return;
}
 

Rev 1353	Rev 1354
1	`/* Sved, the SvarDOS editor`	1	`/* Sved, the SvarDOS editor`
2	`*`	2	`*`
3	`* Copyright (C) 2023 Mateusz Viste`	3	`* Copyright (C) 2023 Mateusz Viste`
4	`*`	4	`*`
5	`* Sved is released under the terms of the MIT license.`	5	`* Sved is released under the terms of the MIT license.`
6	`*`	6	`*`
7	`* Permission is hereby granted, free of charge, to any person obtaining a copy`	7	`* Permission is hereby granted, free of charge, to any person obtaining a copy`
8	`* of this software and associated documentation files (the "Software"), to`	8	`* of this software and associated documentation files (the "Software"), to`
9	`* deal in the Software without restriction, including without limitation the`	9	`* deal in the Software without restriction, including without limitation the`
10	`* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or`	10	`* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or`
11	`* sell copies of the Software, and to permit persons to whom the Software is`	11	`* sell copies of the Software, and to permit persons to whom the Software is`
12	`* furnished to do so, subject to the following conditions:`	12	`* furnished to do so, subject to the following conditions:`
13	`*`	13	`*`
14	`* The above copyright notice and this permission notice shall be included in`	14	`* The above copyright notice and this permission notice shall be included in`
15	`* all copies or substantial portions of the Software.`	15	`* all copies or substantial portions of the Software.`
16	`*`	16	`*`
17	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`	17	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`
18	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`	18	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`
19	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`	19	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`
20	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`	20	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`
21	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`	21	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`
22	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS`	22	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS`
23	`* IN THE SOFTWARE.`	23	`* IN THE SOFTWARE.`
24	`*/`	24	`*/`
25		25
26	`#include <dos.h> /* _dos_open(), _dos_read(), _dos_close(), ... */`	26	`#include <dos.h> /* _dos_open(), _dos_read(), _dos_close(), ... */`
27	`#include <fcntl.h> /* O_RDONLY, O_WRONLY */`	27	`#include <fcntl.h> /* O_RDONLY, O_WRONLY */`
28	`#include <string.h>`	28	`#include <string.h>`
29		29
30	`#include "mdr\bios.h"`	30	`#include "mdr\bios.h"`
31	`#include "mdr\cout.h"`	31	`#include "mdr\cout.h"`
32	`#include "mdr\dos.h"`	32	`#include "mdr\dos.h"`
33	`#include "mdr\keyb.h"`	33	`#include "mdr\keyb.h"`
34		34
35	`#include "svarlang\svarlang.h"`	35	`#include "svarlang\svarlang.h"`
36		36
37		37
38	`/*****************************************************************************`	38	`/*****************************************************************************`
39	`* global variables and definitions *`	39	`* global variables and definitions *`
40	`*****************************************************************************/`	40	`*****************************************************************************/`
41		41
42	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`	42	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`
43	`static unsigned char SCHEME_TEXT = 0x07,`	43	`static unsigned char SCHEME_TEXT = 0x07,`
-		44	`SCHEME_MENU = 0x70,`
-		45	`SCHEME_MENU_CUR= 0x0f,`
-		46	`SCHEME_MENU_SEL= 0x00,`
44	`SCHEME_STBAR1 = 0x70,`	47	`SCHEME_STBAR1 = 0x70,`
45	`SCHEME_STBAR2 = 0x70,`	48	`SCHEME_STBAR2 = 0x70,`
46	`SCHEME_STBAR3 = 0xf0,`	49	`SCHEME_STBAR3 = 0xf0,`
47	`SCHEME_SCROLL = 0x70,`	50	`SCHEME_SCROLL = 0x70,`
48	`SCHEME_MSG = 0x70,`	51	`SCHEME_MSG = 0x70,`
49	`SCHEME_ERR = 0xf0;`	52	`SCHEME_ERR = 0xf0;`
50		53
51	`static unsigned char screenw, screenh;`	54	`static unsigned char screenw, screenh;`
52		55
53	`static struct {`	56	`static struct {`
54	`unsigned char from;`	57	`unsigned char from;`
55	`unsigned char to;`	58	`unsigned char to;`
56	`unsigned char statusbar;`	59	`unsigned char statusbar;`
57	`} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */`	60	`} uidirty = {0, 0xff, 1}; /* make sure to redraw entire UI at first run */`
58		61
59	`#define SCROLL_CURSOR 0xB1`	62	`#define SCROLL_CURSOR 0xB1`
60		63
61	`struct line {`	64	`struct line {`
62	`struct line far *prev;`	65	`struct line far *prev;`
63	`struct line far *next;`	66	`struct line far *next;`
64	`unsigned short len;`	67	`unsigned short len;`
65	`char payload[1];`	68	`char payload[1];`
66	`};`	69	`};`
67		70
68	`struct file {`	71	`struct file {`
69	`struct line far *cursor;`	72	`struct line far *cursor;`
70	`unsigned short xoffset;`	73	`unsigned short xoffset;`
71	`unsigned short cursorposx;`	74	`unsigned short cursorposx;`
72	`unsigned short cursorposy;`	75	`unsigned short cursorposy;`
73	`unsigned short totlines;`	76	`unsigned short totlines;`
74	`unsigned short curline;`	77	`unsigned short curline;`
75	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`	78	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`
76	`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 */`
77	`char fname[128];`	80	`char fname[128];`
78	`};`	81	`};`
79		82
80		83
81	`/*****************************************************************************`	84	`/*****************************************************************************`
82	`* functions *`	85	`* functions *`
83	`*****************************************************************************/`	86	`*****************************************************************************/`
84		87
85	`static struct line far *line_calloc(unsigned short siz) {`	88	`static struct line far *line_calloc(unsigned short siz) {`
86	`struct line far *res;`	89	`struct line far *res;`
87	`unsigned int seg;`	90	`unsigned int seg;`
88	`if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);`	91	`if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);`
89	`res = MK_FP(seg, 0);`	92	`res = MK_FP(seg, 0);`
90	`_fmemset(res, 0, sizeof(struct line) + siz);`	93	`_fmemset(res, 0, sizeof(struct line) + siz);`
91	`return(MK_FP(seg, 0));`	94	`return(MK_FP(seg, 0));`
92	`}`	95	`}`
93		96
94		97
95	`static void line_free(struct line far *ptr) {`	98	`static void line_free(struct line far *ptr) {`
96	`_dos_freemem(FP_SEG(ptr));`	99	`_dos_freemem(FP_SEG(ptr));`
97	`}`	100	`}`
98		101
99		102
100	`static int curline_resize(struct file far *db, unsigned short newsiz) {`	103	`static int curline_resize(struct file far *db, unsigned short newsiz) {`
101	`unsigned int maxavail;`	104	`unsigned int maxavail;`
102	`struct line far *newptr;`	105	`struct line far *newptr;`
103		106
104	`/* try resizing the block (much faster) */`	107	`/* try resizing the block (much faster) */`
105	`if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);`	108	`if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);`
106		109
107	`/* create a new block and copy data over */`	110	`/* create a new block and copy data over */`
108	`newptr = line_calloc(newsiz);`	111	`newptr = line_calloc(newsiz);`
109	`if (newptr == NULL) return(-1);`	112	`if (newptr == NULL) return(-1);`
110	`_fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);`	113	`_fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);`
111		114
112	`/* rewire the linked list */`	115	`/* rewire the linked list */`
113	`db->cursor = newptr;`	116	`db->cursor = newptr;`
114	`if (newptr->next) newptr->next->prev = newptr;`	117	`if (newptr->next) newptr->next->prev = newptr;`
115	`if (newptr->prev) newptr->prev->next = newptr;`	118	`if (newptr->prev) newptr->prev->next = newptr;`
116		119
117	`return(0);`	120	`return(0);`
118	`}`	121	`}`
119		122
120		123
121	`/* adds a new line at cursor position into file linked list and advance cursor`	124	`/* adds a new line at cursor position into file linked list and advance cursor`
122	`* returns non-zero on error */`	125	`* returns non-zero on error */`
123	`static int line_add(struct file db, const char far line, unsigned short slen) {`	126	`static int line_add(struct file db, const char far line, unsigned short slen) {`
124	`struct line far *l;`	127	`struct line far *l;`
125		128
126	`l = line_calloc(slen);`	129	`l = line_calloc(slen);`
127	`if (l == NULL) return(-1);`	130	`if (l == NULL) return(-1);`
128		131
129	`l->prev = db->cursor;`	132	`l->prev = db->cursor;`
130	`if (db->cursor) {`	133	`if (db->cursor) {`
131	`l->next = db->cursor->next;`	134	`l->next = db->cursor->next;`
132	`db->cursor->next = l;`	135	`db->cursor->next = l;`
133	`l->next->prev = l;`	136	`l->next->prev = l;`
134	`}`	137	`}`
135	`db->cursor = l;`	138	`db->cursor = l;`
136	`if (slen > 0) {`	139	`if (slen > 0) {`
137	`_fmemmove(l->payload, line, slen);`	140	`_fmemmove(l->payload, line, slen);`
138	`l->len = slen;`	141	`l->len = slen;`
139	`}`	142	`}`
140		143
141	`db->totlines += 1;`	144	`db->totlines += 1;`
142	`db->curline += 1;`	145	`db->curline += 1;`
143		146
144	`return(0);`	147	`return(0);`
145	`}`	148	`}`
146		149
147		150
148	`static void ui_getstring(const char query, char s, unsigned short maxlen) {`	151	`static void ui_getstring(const char query, char s, unsigned short maxlen) {`
149	`unsigned short len = 0;`	152	`unsigned short len = 0;`
150	`unsigned char y, x;`	153	`unsigned char y, x;`
151	`int k;`	154	`int k;`
152		155
153	`if (maxlen == 0) return;`	156	`if (maxlen == 0) return;`
154	`maxlen--; /* make room for the nul terminator */`	157	`maxlen--; /* make room for the nul terminator */`
155		158
156	`y = screenh - 1;`	159	`y = screenh - 1;`
157		160
158	`/* print query string */`	161	`/* print query string */`
159	`x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);`	162	`x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);`
160	`mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);`	163	`mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);`
161		164
162	`for (;;) {`	165	`for (;;) {`
163	`mdr_cout_locate(y, x + len);`	166	`mdr_cout_locate(y, x + len);`
164	`k = keyb_getkey();`	167	`k = keyb_getkey();`
165		168
166	`switch (k) {`	169	`switch (k) {`
167	`case 0x1b: /* ESC */`	170	`case 0x1b: /* ESC */`
168	`s[0] = 0;`	171	`s[0] = 0;`
169	`return;`	172	`return;`
170	`case '\r':`	173	`case '\r':`
171	`s[len] = 0;`	174	`s[len] = 0;`
172	`return;`	175	`return;`
173	`case 0x08: /* BKSPC */`	176	`case 0x08: /* BKSPC */`
174	`if (len > 0) {`	177	`if (len > 0) {`
175	`len--;`	178	`len--;`
176	`mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);`	179	`mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);`
177	`}`	180	`}`
178	`break;`	181	`break;`
179	`default:`	182	`default:`
180	`if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {`	183	`if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {`
181	`mdr_cout_char(y, x + len, k, SCHEME_STBAR3);`	184	`mdr_cout_char(y, x + len, k, SCHEME_STBAR3);`
182	`s[len++] = k;`	185	`s[len++] = k;`
183	`}`	186	`}`
184	`}`	187	`}`
185	`}`	188	`}`
186		189
187	`}`	190	`}`
188		191
189		192
190	`/* append a nul-terminated string to line at cursor position */`	193	`/* append a nul-terminated string to line at cursor position */`
191	`static int line_append(struct file f, const char far buf, unsigned short len) {`	194	`static int line_append(struct file f, const char far buf, unsigned short len) {`
192	`if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */`	195	`if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */`
193	`if (curline_resize(f, f->cursor->len + len) != 0) return(-1);`	196	`if (curline_resize(f, f->cursor->len + len) != 0) return(-1);`
194	`_fmemmove(f->cursor->payload + f->cursor->len, buf, len);`	197	`_fmemmove(f->cursor->payload + f->cursor->len, buf, len);`
195	`f->cursor->len += len;`	198	`f->cursor->len += len;`
196		199
197	`return(0);`	200	`return(0);`
198	`}`	201	`}`
199		202
200		203
201	`static void db_rewind(struct file *db) {`	204	`static void db_rewind(struct file *db) {`
202	`if (db->cursor == NULL) return;`	205	`if (db->cursor == NULL) return;`
203	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	206	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
204	`db->curline = 0;`	207	`db->curline = 0;`
205	`}`	208	`}`
206		209
207		210
208	`static void ui_basic(const struct file *db) {`	211	`static void ui_basic(const struct file *db) {`
209	`const char s = svarlang_strid(0); / HELP */`	212	`const char s = svarlang_strid(0); / HELP */`
210	`unsigned short helpcol = screenw - strlen(s);`	213	`unsigned short helpcol = screenw - strlen(s);`
211		214
212	`/* fill status bar with background (without modflag as it is refreshed by ui_refresh) */`	215	`/* fill status bar with background (without modflag as it is refreshed by ui_refresh) */`
213	`mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);`	216	`mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);`
214		217
215	`/* filename */`	218	`/* filename */`
216	`{`	219	`{`
217	`const char *fn = db->fname;`	220	`const char *fn = db->fname;`
218	`if (*fn == 0) fn = svarlang_str(0, 1);`	221	`if (*fn == 0) fn = svarlang_str(0, 1);`
219	`mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);`	222	`mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);`
220	`}`	223	`}`
221		224
222	`/* eol type */`	225	`/* eol type */`
223	`{`	226	`{`
224	`const char *eoltype = "CRLF";`	227	`const char *eoltype = "CRLF";`
225	`if (db->lfonly) eoltype += 2;`	228	`if (db->lfonly) eoltype += 2;`
226	`mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);`	229	`mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);`
227	`}`	230	`}`
228		231
229	`mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);`	232	`mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);`
230	`}`	233	`}`
231		234
232		235
233	`static void ui_msg(const char msg1, const char msg2, unsigned char attr) {`	236	`static void ui_msg(const char msg1, const char msg2, unsigned char attr) {`
234	`unsigned short x, y, msglen, i;`	237	`unsigned short x, y, msglen, i;`
235	`unsigned char msg2flag = 0;`	238	`unsigned char msg2flag = 0;`
236		239
237	`msglen = strlen(msg1);`	240	`msglen = strlen(msg1);`
238	`if (msg2) {`	241	`if (msg2) {`
239	`msg2flag = 1;`	242	`msg2flag = 1;`
240	`i = strlen(msg2);`	243	`i = strlen(msg2);`
241	`if (i > msglen) msglen = i;`	244	`if (i > msglen) msglen = i;`
242	`}`	245	`}`
243		246
244	`y = (screenh - 6) >> 1;`	247	`y = (screenh - 6) >> 1;`
245	`x = (screenw - msglen - 4) >> 1;`	248	`x = (screenw - msglen - 4) >> 1;`
246	`for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`	249	`for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`
247	`x++;`	250	`x++;`
248		251
249	`mdr_cout_str(y+1, x, msg1, attr, msglen);`	252	`mdr_cout_str(y+1, x, msg1, attr, msglen);`
250	`if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);`	253	`if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);`
251		254
252	`if (uidirty.from > y) uidirty.from = y;`	255	`if (uidirty.from > y) uidirty.from = y;`
253	`if (uidirty.to < y+4) uidirty.to = y+4;`	256	`if (uidirty.to < y+4) uidirty.to = y+4;`
254	`}`	257	`}`
255		258
256		259
257	`static unsigned char ui_confirm_if_unsaved(struct file *db) {`	260	`static unsigned char ui_confirm_if_unsaved(struct file *db) {`
258	`if (db->modflag == 0) return(0);`	261	`if (db->modflag == 0) return(0);`
259		262
260	`/* if file has been modified then ask for confirmation */`	263	`/* if file has been modified then ask for confirmation */`
261	`ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);`	264	`ui_msg(svarlang_str(0,4), svarlang_str(0,5), SCHEME_MSG);`
262	`if (keyb_getkey() == '\r') return(0);`	265	`if (keyb_getkey() == '\r') return(0);`
263		266
264	`return(1);`	267	`return(1);`
265	`}`	268	`}`
266		269
267		270
268	`static void ui_help(void) {`	-
269	`#define MAXLINLEN 39`	-
270	`unsigned short i, offset;`	-
271	`offset = (screenw - MAXLINLEN) >> 1;`	-
272		-
273	`for (i = 3; i < 25; i++) {`	-
274	`const char *s = svarlang_str(8, i);`	-
275	`if (s[0] == 0) break;`	-
276	`mdr_cout_char_rep(i, offset, ' ', SCHEME_STBAR1, MAXLINLEN);`	-
277	`if (s[0] == '.') continue;`	-
278	`mdr_cout_locate(i, offset + 2 + mdr_cout_str(i, offset + 2, s, SCHEME_STBAR1, MAXLINLEN - 2));`	-
279	`}`	-
280		-
281	`keyb_getkey();`	-
282	`#undef MAXLINLEN`	-
283	`}`	-
284		-
285		-
286	`static void ui_refresh(const struct file *db) {`	271	`static void ui_refresh(const struct file *db) {`
287	`unsigned char x;`	272	`unsigned char x;`
288	`const struct line far *l;`	273	`const struct line far *l;`
289	`unsigned char y = db->cursorposy;`	274	`unsigned char y = db->cursorposy;`
290		275
291	`#ifdef DBG_REFRESH`	276	`#ifdef DBG_REFRESH`
292	`static char m = 'a';`	277	`static char m = 'a';`
293	`m++;`	278	`m++;`
294	`if (m > 'z') m = 'a';`	279	`if (m > 'z') m = 'a';`
295	`#endif`	280	`#endif`
296		281
297	`/* rewind cursor line to first line that needs redrawing */`	282	`/* rewind cursor line to first line that needs redrawing */`
298	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`	283	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`
299		284
300	`/* iterate over lines and redraw whatever needs to be redrawn */`	285	`/* iterate over lines and redraw whatever needs to be redrawn */`
301	`for (; l != NULL; l = l->next, y++) {`	286	`for (; l != NULL; l = l->next, y++) {`
302		287
303	`/* skip lines that do not need to be refreshed */`	288	`/* skip lines that do not need to be refreshed */`
304	`if (y < uidirty.from) continue;`	289	`if (y < uidirty.from) continue;`
305	`if (y > uidirty.to) break;`	290	`if (y > uidirty.to) break;`
306		291
307	`x = 0;`	292	`x = 0;`
308	`if (db->xoffset < l->len) {`	293	`if (db->xoffset < l->len) {`
309	`unsigned char i, limit;`	294	`unsigned char i, limit;`
310	`if (l->len - db->xoffset < screenw) {`	295	`if (l->len - db->xoffset < screenw) {`
311	`limit = l->len;`	296	`limit = l->len;`
312	`} else {`	297	`} else {`
313	`limit = db->xoffset + screenw - 1;`	298	`limit = db->xoffset + screenw - 1;`
314	`}`	299	`}`
315	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);`	300	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);`
316	`}`	301	`}`
317		302
318	`/* write empty spaces until end of line */`	303	`/* write empty spaces until end of line */`
319	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);`	304	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);`
320		305
321	`#ifdef DBG_REFRESH`	306	`#ifdef DBG_REFRESH`
322	`mdr_cout_char(y, 0, m, SCHEME_STBAR1);`	307	`mdr_cout_char(y, 0, m, SCHEME_STBAR1);`
323	`#endif`	308	`#endif`
324		309
325	`if (y == screenh - 2) break;`	310	`if (y == screenh - 2) break;`
326	`}`	311	`}`
327		312
328	`/* fill all lines below if empty (and they need to be redrawn) */`	313	`/* fill all lines below if empty (and they need to be redrawn) */`
329	`if (l == NULL) {`	314	`if (l == NULL) {`
330	`while ((y < screenh - 1) && (y < uidirty.to)) {`	315	`while ((y < screenh - 1) && (y < uidirty.to)) {`
331	`mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);`	316	`mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);`
332	`}`	317	`}`
333	`}`	318	`}`
334		319
335	`/* "file changed" flag */`	320	`/* "file changed" flag */`
336	`mdr_cout_char(screenh - 1, 0, db->modflag, SCHEME_STBAR1);`	321	`mdr_cout_char(screenh - 1, 0, db->modflag, SCHEME_STBAR1);`
337		322
338	`/* scroll bar */`	323	`/* scroll bar */`
339	`for (y = 0; y < (screenh - 1); y++) {`	324	`for (y = 0; y < (screenh - 1); y++) {`
340	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);`	325	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);`
341	`}`	326	`}`
342		327
343	`/* scroll cursor */`	328	`/* scroll cursor */`
344	`if (db->totlines >= screenh) {`	329	`if (db->totlines >= screenh) {`
345	`unsigned short topline = db->curline - db->cursorposy;`	330	`unsigned short topline = db->curline - db->cursorposy;`
346	`unsigned short col;`	331	`unsigned short col;`
347	`unsigned short totlines = db->totlines - screenh + 1;`	332	`unsigned short totlines = db->totlines - screenh + 1;`
348	`if (db->totlines - screenh > screenh) {`	333	`if (db->totlines - screenh > screenh) {`
349	`col = topline / (totlines / (screenh - 1));`	334	`col = topline / (totlines / (screenh - 1));`
350	`} else {`	335	`} else {`
351	`col = topline * (screenh - 1) / totlines;`	336	`col = topline * (screenh - 1) / totlines;`
352	`}`	337	`}`
353	`if (col >= screenh - 1) col = screenh - 2;`	338	`if (col >= screenh - 1) col = screenh - 2;`
354	`mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);`	339	`mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);`
355	`}`	340	`}`
356	`}`	341	`}`
357		342
358		343
359	`static void check_cursor_not_after_eol(struct file *db) {`	344	`static void check_cursor_not_after_eol(struct file *db) {`
360	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	345	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
361		346
362	`if (db->cursor->len < db->xoffset) {`	347	`if (db->cursor->len < db->xoffset) {`
363	`db->cursorposx = 0;`	348	`db->cursorposx = 0;`
364	`db->xoffset = db->cursor->len;`	349	`db->xoffset = db->cursor->len;`
365	`uidirty.from = 0;`	350	`uidirty.from = 0;`
366	`uidirty.to = 0xff;`	351	`uidirty.to = 0xff;`
367	`} else {`	352	`} else {`
368	`db->cursorposx = db->cursor->len - db->xoffset;`	353	`db->cursorposx = db->cursor->len - db->xoffset;`
369	`}`	354	`}`
370	`}`	355	`}`
371		356
372		357
373	`static void cursor_up(struct file *db) {`	358	`static void cursor_up(struct file *db) {`
374	`if (db->cursor->prev != NULL) {`	359	`if (db->cursor->prev != NULL) {`
375	`db->curline -= 1;`	360	`db->curline -= 1;`
376	`db->cursor = db->cursor->prev;`	361	`db->cursor = db->cursor->prev;`
377	`if (db->cursorposy == 0) {`	362	`if (db->cursorposy == 0) {`
378	`uidirty.from = 0;`	363	`uidirty.from = 0;`
379	`uidirty.to = 0xff;`	364	`uidirty.to = 0xff;`
380	`} else {`	365	`} else {`
381	`db->cursorposy -= 1;`	366	`db->cursorposy -= 1;`
382	`}`	367	`}`
383	`}`	368	`}`
384	`}`	369	`}`
385		370
386		371
387	`static void cursor_eol(struct file *db) {`	372	`static void cursor_eol(struct file *db) {`
388	`/* adjust xoffset to make sure eol is visible on screen */`	373	`/* adjust xoffset to make sure eol is visible on screen */`
389	`if (db->xoffset > db->cursor->len) {`	374	`if (db->xoffset > db->cursor->len) {`
390	`db->xoffset = db->cursor->len - 1;`	375	`db->xoffset = db->cursor->len - 1;`
391	`uidirty.from = 0;`	376	`uidirty.from = 0;`
392	`uidirty.to = 0xff;`	377	`uidirty.to = 0xff;`
393	`}`	378	`}`
394		379
395	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	380	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
396	`db->xoffset = db->cursor->len - screenw + 2;`	381	`db->xoffset = db->cursor->len - screenw + 2;`
397	`uidirty.from = 0;`	382	`uidirty.from = 0;`
398	`uidirty.to = 0xff;`	383	`uidirty.to = 0xff;`
399	`}`	384	`}`
400	`db->cursorposx = db->cursor->len - db->xoffset;`	385	`db->cursorposx = db->cursor->len - db->xoffset;`
401	`}`	386	`}`
402		387
403		388
404	`static void cursor_down(struct file *db) {`	389	`static void cursor_down(struct file *db) {`
405	`if (db->cursor->next != NULL) {`	390	`if (db->cursor->next != NULL) {`
406	`db->curline += 1;`	391	`db->curline += 1;`
407	`db->cursor = db->cursor->next;`	392	`db->cursor = db->cursor->next;`
408	`if (db->cursorposy < screenh - 2) {`	393	`if (db->cursorposy < screenh - 2) {`
409	`db->cursorposy += 1;`	394	`db->cursorposy += 1;`
410	`} else {`	395	`} else {`
411	`uidirty.from = 0;`	396	`uidirty.from = 0;`
412	`uidirty.to = 0xff;`	397	`uidirty.to = 0xff;`
413	`}`	398	`}`
414	`}`	399	`}`
415	`}`	400	`}`
416		401
417		402
418	`static void cursor_left(struct file *db) {`	403	`static void cursor_left(struct file *db) {`
419	`if (db->cursorposx > 0) {`	404	`if (db->cursorposx > 0) {`
420	`db->cursorposx -= 1;`	405	`db->cursorposx -= 1;`
421	`} else if (db->xoffset > 0) {`	406	`} else if (db->xoffset > 0) {`
422	`db->xoffset -= 1;`	407	`db->xoffset -= 1;`
423	`uidirty.from = 0;`	408	`uidirty.from = 0;`
424	`uidirty.to = 0xff;`	409	`uidirty.to = 0xff;`
425	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	410	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
426	`cursor_up(db);`	411	`cursor_up(db);`
427	`cursor_eol(db);`	412	`cursor_eol(db);`
428	`}`	413	`}`
429	`}`	414	`}`
430		415
431		416
432	`static void cursor_home(struct file *db) {`	417	`static void cursor_home(struct file *db) {`
433	`db->cursorposx = 0;`	418	`db->cursorposx = 0;`
434	`if (db->xoffset != 0) {`	419	`if (db->xoffset != 0) {`
435	`db->xoffset = 0;`	420	`db->xoffset = 0;`
436	`uidirty.from = 0;`	421	`uidirty.from = 0;`
437	`uidirty.to = 0xff;`	422	`uidirty.to = 0xff;`
438	`}`	423	`}`
439	`}`	424	`}`
440		425
441		426
442	`static void cursor_right(struct file *db) {`	427	`static void cursor_right(struct file *db) {`
443	`if (db->cursor->len > db->xoffset + db->cursorposx) {`	428	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
444	`if (db->cursorposx < screenw - 2) {`	429	`if (db->cursorposx < screenw - 2) {`
445	`db->cursorposx += 1;`	430	`db->cursorposx += 1;`
446	`} else {`	431	`} else {`
447	`db->xoffset += 1;`	432	`db->xoffset += 1;`
448	`uidirty.from = 0;`	433	`uidirty.from = 0;`
449	`uidirty.to = 0xff;`	434	`uidirty.to = 0xff;`
450	`}`	435	`}`
451	`} else {`	436	`} else {`
452	`cursor_down(db);`	437	`cursor_down(db);`
453	`cursor_home(db);`	438	`cursor_home(db);`
454	`}`	439	`}`
455	`}`	440	`}`
456		441
457		442
458	`static void del(struct file *db) {`	443	`static void del(struct file *db) {`
459	`if (db->cursorposx + db->xoffset < db->cursor->len) {`	444	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
460	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`	445	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`
461	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	446	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
462	`uidirty.from = db->cursorposy;`	447	`uidirty.from = db->cursorposy;`
463	`uidirty.to = db->cursorposy;`	448	`uidirty.to = db->cursorposy;`
464	`db->modflag = '*';`	449	`db->modflag = '*';`
465	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	450	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`
466	`struct line far *nextline = db->cursor->next;`	451	`struct line far *nextline = db->cursor->next;`
467	`if (db->cursor->next->len > 0) {`	452	`if (db->cursor->next->len > 0) {`
468	`if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {`	453	`if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {`
469	`_fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	454	`_fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
470	`db->cursor->len += db->cursor->next->len;`	455	`db->cursor->len += db->cursor->next->len;`
471	`}`	456	`}`
472	`}`	457	`}`
473		458
474	`db->cursor->next = db->cursor->next->next;`	459	`db->cursor->next = db->cursor->next->next;`
475	`db->cursor->next->prev = db->cursor;`	460	`db->cursor->next->prev = db->cursor;`
476		461
477	`line_free(nextline);`	462	`line_free(nextline);`
478	`uidirty.from = db->cursorposy;`	463	`uidirty.from = db->cursorposy;`
479	`uidirty.to = 0xff;`	464	`uidirty.to = 0xff;`
480	`db->totlines -= 1;`	465	`db->totlines -= 1;`
481	`db->modflag = '*';`	466	`db->modflag = '*';`
482	`}`	467	`}`
483	`}`	468	`}`
484		469
485		470
486	`static void bkspc(struct file *db) {`	471	`static void bkspc(struct file *db) {`
487		472
488	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	473	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
489	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	474	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
490		475
491	`cursor_left(db);`	476	`cursor_left(db);`
492	`del(db);`	477	`del(db);`
493	`}`	478	`}`
494		479
495		480
496	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	481	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
497	`* of argc and argv, saves some 330 bytes of binary size */`	482	`* of argc and argv, saves some 330 bytes of binary size */`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1579 – Rev 1353 → 1354