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


/* Sved, the SvarDOS editor
 *
 * Copyright (C) 2023 Mateusz Viste
 *
 * Sved is released under the terms of the MIT license.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
 
#include <dos.h>      /* _dos_open(), _dos_read(), _dos_close(), ... */
#include <fcntl.h>    /* O_RDONLY, O_WRONLY */
#include <stdlib.h>
#include <string.h>
 
#include "mdr\bios.h"
#include "mdr\cout.h"
#include "mdr\dos.h"
#include "mdr\keyb.h"
 
#include "svarlang\svarlang.h"
 
 
/*****************************************************************************
 * global variables and definitions                                          *
 *****************************************************************************/
 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
static unsigned char SCHEME_TEXT   = 0x07,
                     SCHEME_STBAR1 = 0x70,
                     SCHEME_STBAR2 = 0x70,
                     SCHEME_STBAR3 = 0xf0,
                     SCHEME_SCROLL = 0x70,
                     SCHEME_MSG    = 0x70,
                     SCHEME_ERR    = 0xf0;
 
static unsigned char screenw, screenh;
 
static struct {
    unsigned char from;
    unsigned char to;
} 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                                                                 *
 *****************************************************************************/
 
static struct line far *line_calloc(unsigned short siz) {
  unsigned int seg;
  if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);
  _fmemset(MK_FP(seg, 0), 0, siz);
  return(MK_FP(seg, 0));
}
 
 
static void line_free(struct line far *ptr) {
  _dos_freemem(FP_SEG(ptr));
}
 
 
static signed char curline_resize(struct file far *db, unsigned short newsiz) {
  unsigned int maxavail;
  struct line far *newptr;
 
  /* try resizing the block (much faster) */
  if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);
 
  /* create a new block and copy data over */
  newptr = line_calloc(newsiz);
  if (newptr == NULL) return(-1);
  _fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);
 
  /* rewire the linked list */
  db->cursor = newptr;
  if (newptr->next) newptr->next->prev = newptr;
  if (newptr->prev) newptr->prev->next = newptr;
 
  return(0);
}
 
 
/* adds a new line at cursor position into file linked list and advance cursor
 * returns non-zero on error */
static int line_add(struct file *db, const char far *line, unsigned short slen) {
  struct line far *l;
 
  l = line_calloc(slen);
  if (l == NULL) return(-1);
 
  l->prev = db->cursor;
  if (db->cursor) {
    l->next = db->cursor->next;
    db->cursor->next = l;
    l->next->prev = l;
  }
  db->cursor = l;
  _fmemmove(l->payload, line, slen);
  l->len = slen;
 
  db->totlines += 1;
  db->curline += 1;
 
  return(0);
}
 
 
static void ui_getstring(const char *query, char *s, unsigned char maxlen) {
  unsigned char len = 0, y, x;
  int k;
 
  if (maxlen == 0) return;
  maxlen--; /* make room for the nul terminator */
 
  y = screenh - 1;
 
  /* print query string */
  x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);
  mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);
 
  for (;;) {
    mdr_cout_locate(y, x + len);
    k = keyb_getkey();
 
    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_STBAR3);
      continue;
    }
 
    if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {
      mdr_cout_char(y, x + len, k, SCHEME_STBAR3);
      s[len++] = k;
    }
 
  }
}
 
 
/* append a nul-terminated string to line at cursor position */
static int line_append(struct file *f, const char far *buf, unsigned short len) {
  if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */
  if (curline_resize(f, f->cursor->len + len) != 0) return(-1);
  _fmemmove(f->cursor->payload + f->cursor->len, buf, len);
  f->cursor->len += len;
 
  return(0);
}
 
 
static void db_rewind(struct file *db) {
  if (db->cursor == NULL) return;
  while (db->cursor->prev) db->cursor = db->cursor->prev;
  db->curline = 0;
}
 
 
static void ui_basic(const struct file *db) {
  const char *s = svarlang_strid(0); /* HELP */
  unsigned char helpcol = screenw - strlen(s);
 
  /* fill status bar with background (without modflag as it is refreshed by ui_refresh) */
  mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);
 
  /* filename */
  {
    const char *fn = db->fname;
    if (*fn == 0) fn = svarlang_str(0, 1);
    mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);
  }
 
  /* eol type */
  {
    const char *eoltype = "CRLF";
    if (db->lfonly) eoltype = "LF";
    mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);
  }
 
  mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);
}
 
 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
  unsigned short x, y, msglen, i;
  unsigned char msg2flag = 0;
 
  msglen = strlen(msg1);
  if (msg2) {
    msg2flag = 1;
    i = strlen(msg2);
    if (i > msglen) msglen = i;
  }
 
  y = (screenh - 6) >> 1;
  x = (screenw - msglen - 4) >> 1;
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
  x++;
  mdr_cout_str(y+1, x, msg1, attr, msglen);
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
 
  if (uidirty.from > y) uidirty.from = y;
  if (uidirty.to < y+4) uidirty.to = y+4;
}
 
 
static void ui_help(void) {
#define MAXLINLEN 35
  unsigned char i, offset;
  offset = (screenw - MAXLINLEN + 2) >> 1;
 
  for (i = 2; i < 18; i++) {
    mdr_cout_char_rep(i, offset - 2, ' ', SCHEME_STBAR1, MAXLINLEN + 2);
  }
 
  for (i = 0; i < 20; i++) {
    const char *s = svarlang_str(8, i);
    if (s[0] == 0) break;
    if (s[0] == '.') continue;
    mdr_cout_locate(3 + i, offset + mdr_cout_str(3 + i, offset, s, SCHEME_STBAR1, MAXLINLEN));
  }
 
  keyb_getkey();
#undef MAXLINLEN
}
 
 
static void ui_refresh(const struct file *db) {
  unsigned char x;
  const struct line far *l;
  unsigned char y = db->cursorposy;
 
#ifdef DBG_REFRESH
  static char m = 'a';
  m++;
  if (m > 'z') m = 'a';
#endif
 
  /* rewind cursor line to first line that needs redrawing */
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
 
  /* iterate over lines and redraw whatever needs to be redrawn */
  for (; l != NULL; l = l->next, y++) {
 
    /* skip lines that do not need to be refreshed */
    if (y < uidirty.from) continue;
    if (y > uidirty.to) break;
 
    x = 0;
    if (db->xoffset < l->len) {
      unsigned char i, limit;
      if (l->len - db->xoffset < screenw) {
        limit = l->len;
      } else {
        limit = db->xoffset + screenw - 1;
      }
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);
    }
 
    /* write empty spaces until end of line */
    if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);
 
#ifdef DBG_REFRESH
    mdr_cout_char(y, 0, m, SCHEME_STBAR1);
#endif
 
    if (y == screenh - 2) break;
  }
 
  /* fill all lines below if empty (and they need to be redrawn) */
  if (l == NULL) {
    while ((y < screenh - 1) && (y < uidirty.to)) {
      mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);
    }
  }
 
  /* "file changed" flag */
  {
    char flg = ' ';
    if (db->modflag) flg = '*';
    mdr_cout_char(screenh - 1, 0, flg, SCHEME_STBAR1);
  }
 
  /* scroll bar */
  for (y = 0; y < (screenh - 1); y++) {
    mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);
  }
 
  /* scroll cursor */
  if (db->totlines >= screenh) {
    unsigned short topline = db->curline - db->cursorposy;
    unsigned short col;
    unsigned short totlines = db->totlines - screenh + 1;
    if (db->totlines - screenh > screenh) {
      col = topline / (totlines / (screenh - 1));
    } else {
      col = topline * (screenh - 1) / totlines;
    }
    if (col >= screenh - 1) col = screenh - 2;
    mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);
  }
}
 
 
static void check_cursor_not_after_eol(struct file *db) {
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
 
  if (db->cursor->len < db->xoffset) {
    db->cursorposx = 0;
    db->xoffset = db->cursor->len;
    uidirty.from = 0;
    uidirty.to = 0xff;
  } else {
    db->cursorposx = db->cursor->len - db->xoffset;
  }
}
 
 
static void cursor_up(struct file *db) {
  if (db->cursor->prev != NULL) {
    db->curline -= 1;
    db->cursor = db->cursor->prev;
    if (db->cursorposy == 0) {
      uidirty.from = 0;
      uidirty.to = 0xff;
    } else {
      db->cursorposy -= 1;
    }
  }
}
 
 
static void cursor_eol(struct file *db) {
  /* adjust xoffset to make sure eol is visible on screen */
  if (db->xoffset > db->cursor->len) {
    db->xoffset = db->cursor->len - 1;
    uidirty.from = 0;
    uidirty.to = 0xff;
  }
 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
    db->xoffset = db->cursor->len - screenw + 2;
    uidirty.from = 0;
    uidirty.to = 0xff;
  }
  db->cursorposx = db->cursor->len - db->xoffset;
}
 
 
static void cursor_down(struct file *db) {
  if (db->cursor->next != NULL) {
    db->curline += 1;
    db->cursor = db->cursor->next;
    if (db->cursorposy < screenh - 2) {
      db->cursorposy += 1;
    } else {
      uidirty.from = 0;
      uidirty.to = 0xff;
    }
  }
}
 
 
static void cursor_left(struct file *db) {
  if (db->cursorposx > 0) {
    db->cursorposx -= 1;
  } else if (db->xoffset > 0) {
    db->xoffset -= 1;
    uidirty.from = 0;
    uidirty.to = 0xff;
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
    cursor_up(db);
    cursor_eol(db);
  }
}
 
 
static void cursor_home(struct file *db) {
  db->cursorposx = 0;
  if (db->xoffset != 0) {
    db->xoffset = 0;
    uidirty.from = 0;
    uidirty.to = 0xff;
  }
}
 
 
static void cursor_right(struct file *db) {
  if (db->cursor->len > db->xoffset + db->cursorposx) {
    if (db->cursorposx < screenw - 2) {
      db->cursorposx += 1;
    } else {
      db->xoffset += 1;
      uidirty.from = 0;
      uidirty.to = 0xff;
    }
  } else {
    cursor_down(db);
    cursor_home(db);
  }
}
 
 
static void del(struct file *db) {
  if (db->cursorposx + db->xoffset < db->cursor->len) {
    _fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
    uidirty.from = db->cursorposy;
    uidirty.to = db->cursorposy;
    db->modflag = 1;
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
    struct line far *nextline = db->cursor->next;
    if (db->cursor->next->len > 0) {
      if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {
        _fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
        db->cursor->len += db->cursor->next->len;
      }
    }
 
    db->cursor->next = db->cursor->next->next;
    db->cursor->next->prev = db->cursor;
 
    line_free(nextline);
    uidirty.from = db->cursorposy;
    uidirty.to = 0xff;
    db->totlines -= 1;
    db->modflag = 1;
  }
}
 
 
static void bkspc(struct file *db) {
 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
  if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
 
  cursor_left(db);
  del(db);
}
 
 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
 * of argc and argv, saves some 330 bytes of binary size */
static char *parseargv(void) {
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
  unsigned char count = 0;
  char *argv[4];
 
  while (count < 4) {
    /* jump to nearest arg */
    while (*tail == ' ') {
      *tail = 0;
      tail++;
    }
 
    if (*tail == '\r') {
      *tail = 0;
      break;
    }
 
    argv[count++] = tail;
 
    /* jump to next delimiter */
    while ((*tail != ' ') && (*tail != '\r')) tail++;
  }
 
  /* check args now */
  if (count == 0) return("");
 
  return(argv[0]);
}
 
 
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;
  static struct file db[1];
 
  bzero(db, sizeof(db));
  memcpy(db->fname, fname, strlen(fname));
 
  if (*fname == 0) goto SKIPLOADING;
 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
    mdr_coutraw_puts("Failed to open file:");
    mdr_coutraw_puts(fname);
    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");
      goto IOERR;
    }
 
    /* add a new line if necessary */
    if (eolfound) {
      if (line_add(db, NULL, 0) != 0) {
      /* TODO ERROR HANDLING */
        mdr_coutraw_puts("out of memory");
        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(db);
 
  IOERR:
  _dos_close(fd);
  return(NULL);
}
 
 
static int savefile(const struct file *db, const char *newfname) {
  int fd;
  const struct line far *l;
  unsigned bytes;
  unsigned char eollen;
  unsigned char eolbuf[2];
  int errflag = 0;
 
  /* either create a new file if newfname provided, or... */
  if (newfname) {
    if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
  } else { /* ...open db->fname */
    if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
  }
 
  l = db->cursor;
  while (l->prev) l = l->prev;
 
  /* preset line terminators */
  if (db->lfonly) {
    eolbuf[0] = '\n';
    eollen = 1;
  } else {
    eolbuf[0] = '\r';
    eolbuf[1] = '\n';
    eollen = 2;
  }
 
  while (l) {
    /* do not write the last empty line, it is only useful for edition */
    if (l->len != 0) {
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
    } else if (l->next == NULL) {
      break;
    }
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
    l = l->next;
  }
 
  errflag |= _dos_close(fd);
 
  return(errflag);
}
 
 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
  if (curline_resize(db, db->cursor->len + len) == 0) {
    unsigned short off = db->xoffset + db->cursorposx;
    db->modflag = 1;
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
    db->cursor->len += len;
    uidirty.from = db->cursorposy;
    uidirty.to = db->cursorposy;
    while (len--) {
      db->cursor->payload[off++] = *databuf;
      databuf++;
      cursor_right(db);
    }
  }
}
 
 
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 color scheme if mdr_cout_init returns a color flag */
    SCHEME_TEXT = 0x17;
    SCHEME_STBAR1 = 0x70;
    SCHEME_STBAR2 = 0x78;
    SCHEME_STBAR3 = 0xf0;
    SCHEME_SCROLL = 0x70;
    SCHEME_MSG = 0xf0;
    SCHEME_ERR = 0x4f;
  }
  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_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;
 
    } 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;
 
    } 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_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_MSG);
        mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
      } else {
        ui_msg(svarlang_str(0, 3), NULL, SCHEME_ERR);
        mdr_bios_tickswait(36); /* 2s */
      }
 
      ui_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;
      }
 
#ifdef DBG_UNHKEYS
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
      char buff[4];
      const char *HEX = "0123456789ABCDEF";
      buff[0] = HEX[(k >> 8) & 15];
      buff[1] = HEX[(k >> 4) & 15];
      buff[2] = HEX[k & 15];
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", SCHEME_STBAR1, 17);
      mdr_cout_str(screenh - 1, 17, buff, SCHEME_STBAR1, 3);
      keyb_getkey();
      break;
#endif
    }
  }
 
  mdr_cout_close();
 
  /* no need to free memory, DOS will do it for me */
 
  return(0);
}
 

Rev 1340	Rev 1341
1	`/* Sved, the SvarDOS editor`	1	`/* Sved, the SvarDOS editor`
2	`*`	2	`*`
3	`* Copyright (C) 2023 Mateusz Viste`	3	`* Copyright (C) 2023 Mateusz Viste`
4	`*`	4	`*`
5	`* Sved is released under the terms of the MIT license.`	5	`* Sved is released under the terms of the MIT license.`
6	`*`	6	`*`
7	`* Permission is hereby granted, free of charge, to any person obtaining a copy`	7	`* Permission is hereby granted, free of charge, to any person obtaining a copy`
8	`* of this software and associated documentation files (the "Software"), to`	8	`* of this software and associated documentation files (the "Software"), to`
9	`* deal in the Software without restriction, including without limitation the`	9	`* deal in the Software without restriction, including without limitation the`
10	`* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or`	10	`* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or`
11	`* sell copies of the Software, and to permit persons to whom the Software is`	11	`* sell copies of the Software, and to permit persons to whom the Software is`
12	`* furnished to do so, subject to the following conditions:`	12	`* furnished to do so, subject to the following conditions:`
13	`*`	13	`*`
14	`* The above copyright notice and this permission notice shall be included in`	14	`* The above copyright notice and this permission notice shall be included in`
15	`* all copies or substantial portions of the Software.`	15	`* all copies or substantial portions of the Software.`
16	`*`	16	`*`
17	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`	17	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`
18	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`	18	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`
19	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`	19	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`
20	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`	20	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`
21	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`	21	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`
22	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS`	22	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS`
23	`* IN THE SOFTWARE.`	23	`* IN THE SOFTWARE.`
24	`*/`	24	`*/`
25		25
26	`#include <dos.h> /* _dos_open(), _dos_read(), _dos_close(), ... */`	26	`#include <dos.h> /* _dos_open(), _dos_read(), _dos_close(), ... */`
27	`#include <fcntl.h> /* O_RDONLY, O_WRONLY */`	27	`#include <fcntl.h> /* O_RDONLY, O_WRONLY */`
28	`#include <stdlib.h>`	28	`#include <stdlib.h>`
29	`#include <string.h>`	29	`#include <string.h>`
30		30
31	`#include "mdr\bios.h"`	31	`#include "mdr\bios.h"`
32	`#include "mdr\cout.h"`	32	`#include "mdr\cout.h"`
33	`#include "mdr\dos.h"`	33	`#include "mdr\dos.h"`
34	`#include "mdr\keyb.h"`	34	`#include "mdr\keyb.h"`
35		35
36	`#include "svarlang\svarlang.h"`	36	`#include "svarlang\svarlang.h"`
37		37
38		38
39	`/*****************************************************************************`	39	`/*****************************************************************************`
40	`* global variables and definitions *`	40	`* global variables and definitions *`
41	`*****************************************************************************/`	41	`*****************************************************************************/`
42		42
43	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`	43	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`
44	`static unsigned char SCHEME_TEXT = 0x07,`	44	`static unsigned char SCHEME_TEXT = 0x07,`
45	`SCHEME_STBAR1 = 0x70,`	45	`SCHEME_STBAR1 = 0x70,`
46	`SCHEME_STBAR2 = 0x70,`	46	`SCHEME_STBAR2 = 0x70,`
47	`SCHEME_STBAR3 = 0xf0,`	47	`SCHEME_STBAR3 = 0xf0,`
48	`SCHEME_SCROLL = 0x70,`	48	`SCHEME_SCROLL = 0x70,`
49	`SCHEME_MSG = 0x70,`	49	`SCHEME_MSG = 0x70,`
50	`SCHEME_ERR = 0xf0;`	50	`SCHEME_ERR = 0xf0;`
51		51
52	`static unsigned char screenw, screenh;`	52	`static unsigned char screenw, screenh;`
53		53
54	`static struct {`	54	`static struct {`
55	`unsigned char from;`	55	`unsigned char from;`
56	`unsigned char to;`	56	`unsigned char to;`
57	`} uidirty = {0, 0xff}; /* make sure to redraw entire UI at first run */`	57	`} uidirty = {0, 0xff}; /* make sure to redraw entire UI at first run */`
58		58
59	`#define SCROLL_CURSOR 0xB1`	59	`#define SCROLL_CURSOR 0xB1`
60		60
61	`struct line {`	61	`struct line {`
62	`struct line far *prev;`	62	`struct line far *prev;`
63	`struct line far *next;`	63	`struct line far *next;`
64	`unsigned short len;`	64	`unsigned short len;`
65	`char payload[1];`	65	`char payload[1];`
66	`};`	66	`};`
67		67
68	`struct file {`	68	`struct file {`
69	`int fd;`	69	`int fd;`
70	`struct line far *cursor;`	70	`struct line far *cursor;`
71	`unsigned short xoffset;`	71	`unsigned short xoffset;`
72	`unsigned char cursorposx;`	72	`unsigned char cursorposx;`
73	`unsigned char cursorposy;`	73	`unsigned char cursorposy;`
74	`unsigned short totlines;`	74	`unsigned short totlines;`
75	`unsigned short curline;`	75	`unsigned short curline;`
76	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`	76	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`
77	`char modflag; /* non-zero if file has been modified since last save */`	77	`char modflag; /* non-zero if file has been modified since last save */`
78	`char fname[128];`	78	`char fname[128];`
79	`};`	79	`};`
80		80
81		81
82	`/*****************************************************************************`	82	`/*****************************************************************************`
83	`* functions *`	83	`* functions *`
84	`*****************************************************************************/`	84	`*****************************************************************************/`
85		85
86	`static struct line far *line_calloc(unsigned short siz) {`	86	`static struct line far *line_calloc(unsigned short siz) {`
87	`unsigned int seg;`	87	`unsigned int seg;`
88	`if (_dos_allocmem((sizeof(struct line) + siz) / 16 + 1, &seg) != 0) return(NULL);`	88	`if (_dos_allocmem((sizeof(struct line) + siz + 15) / 16, &seg) != 0) return(NULL);`
89	`_fmemset(MK_FP(seg, 0), 0, siz);`	89	`_fmemset(MK_FP(seg, 0), 0, siz);`
90	`return(MK_FP(seg, 0));`	90	`return(MK_FP(seg, 0));`
91	`}`	91	`}`
92		92
93		93
94	`static void line_free(struct line far *ptr) {`	94	`static void line_free(struct line far *ptr) {`
95	`_dos_freemem(FP_SEG(ptr));`	95	`_dos_freemem(FP_SEG(ptr));`
96	`}`	96	`}`
97		97
98		98
99	`static signed char curline_resize(struct file far *db, unsigned short newsiz) {`	99	`static signed char curline_resize(struct file far *db, unsigned short newsiz) {`
100	`unsigned int maxavail;`	100	`unsigned int maxavail;`
101	`struct line far *newptr;`	101	`struct line far *newptr;`
102		102
103	`/* try resizing the block (faster) */`	103	`/* try resizing the block (much faster) */`
104	`if (_dos_setblock((sizeof(struct line) + newsiz) / 16 + 1, FP_SEG(db->cursor), &maxavail) == 0) return(0);`	104	`if (_dos_setblock((sizeof(struct line) + newsiz + 15) / 16, FP_SEG(db->cursor), &maxavail) == 0) return(0);`
105		105
106	`/* create a new block and copy data over */`	106	`/* create a new block and copy data over */`
107	`newptr = line_calloc(newsiz);`	107	`newptr = line_calloc(newsiz);`
108	`if (newptr == NULL) return(-1);`	108	`if (newptr == NULL) return(-1);`
109	`_fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);`	109	`_fmemmove(newptr, db->cursor, sizeof(struct line) + db->cursor->len);`
110		110
111	`/* rewire the linked list */`	111	`/* rewire the linked list */`
112	`db->cursor = newptr;`	112	`db->cursor = newptr;`
113	`if (newptr->next) newptr->next->prev = newptr;`	113	`if (newptr->next) newptr->next->prev = newptr;`
114	`if (newptr->prev) newptr->prev->next = newptr;`	114	`if (newptr->prev) newptr->prev->next = newptr;`
115		115
116	`return(0);`	116	`return(0);`
117	`}`	117	`}`
118		118
119		119
120	`/* adds a new line at cursor position into file linked list and advance cursor`	120	`/* adds a new line at cursor position into file linked list and advance cursor`
121	`* returns non-zero on error */`	121	`* returns non-zero on error */`
122	`static int line_add(struct file db, const char far line, unsigned short slen) {`	122	`static int line_add(struct file db, const char far line, unsigned short slen) {`
123	`struct line far *l;`	123	`struct line far *l;`
124		124
125	`l = line_calloc(slen);`	125	`l = line_calloc(slen);`
126	`if (l == NULL) return(-1);`	126	`if (l == NULL) return(-1);`
127		127
128	`l->prev = db->cursor;`	128	`l->prev = db->cursor;`
129	`if (db->cursor) {`	129	`if (db->cursor) {`
130	`l->next = db->cursor->next;`	130	`l->next = db->cursor->next;`
131	`db->cursor->next = l;`	131	`db->cursor->next = l;`
132	`l->next->prev = l;`	132	`l->next->prev = l;`
133	`}`	133	`}`
134	`db->cursor = l;`	134	`db->cursor = l;`
135	`_fmemmove(l->payload, line, slen);`	135	`_fmemmove(l->payload, line, slen);`
136	`l->len = slen;`	136	`l->len = slen;`
137		137
138	`db->totlines += 1;`	138	`db->totlines += 1;`
139	`db->curline += 1;`	139	`db->curline += 1;`
140		140
141	`return(0);`	141	`return(0);`
142	`}`	142	`}`
143		143
144		144
145	`static void ui_getstring(const char query, char s, unsigned char maxlen) {`	145	`static void ui_getstring(const char query, char s, unsigned char maxlen) {`
146	`unsigned char len = 0, y, x;`	146	`unsigned char len = 0, y, x;`
147	`int k;`	147	`int k;`
148		148
149	`if (maxlen == 0) return;`	149	`if (maxlen == 0) return;`
150	`maxlen--; /* make room for the nul terminator */`	150	`maxlen--; /* make room for the nul terminator */`
151		151
152	`y = screenh - 1;`	152	`y = screenh - 1;`
153		153
154	`/* print query string */`	154	`/* print query string */`
155	`x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);`	155	`x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);`
156	`mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);`	156	`mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);`
157		157
158	`for (;;) {`	158	`for (;;) {`
159	`mdr_cout_locate(y, x + len);`	159	`mdr_cout_locate(y, x + len);`
160	`k = keyb_getkey();`	160	`k = keyb_getkey();`
161		161
162	`if (k == 0x1b) return; /* ESC */`	162	`if (k == 0x1b) return; /* ESC */`
163		163
164	`if (k == '\r') {`	164	`if (k == '\r') {`
165	`s[len] = 0;`	165	`s[len] = 0;`
166	`return;`	166	`return;`
167	`}`	167	`}`
168		168
169	`if ((k == 0x08) && (len > 0)) { /* BKSPC */`	169	`if ((k == 0x08) && (len > 0)) { /* BKSPC */`
170	`len--;`	170	`len--;`
171	`mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);`	171	`mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);`
172	`continue;`	172	`continue;`
173	`}`	173	`}`
174		174
175	`if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {`	175	`if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {`
176	`mdr_cout_char(y, x + len, k, SCHEME_STBAR3);`	176	`mdr_cout_char(y, x + len, k, SCHEME_STBAR3);`
177	`s[len++] = k;`	177	`s[len++] = k;`
178	`}`	178	`}`
179		179
180	`}`	180	`}`
181	`}`	181	`}`
182		182
183		183
184	`/* append a nul-terminated string to line at cursor position */`	184	`/* append a nul-terminated string to line at cursor position */`
185	`static int line_append(struct file f, const char far buf, unsigned short len) {`	185	`static int line_append(struct file f, const char far buf, unsigned short len) {`
186	`if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */`	186	`if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */`
187	`if (curline_resize(f, f->cursor->len + len) != 0) return(-1);`	187	`if (curline_resize(f, f->cursor->len + len) != 0) return(-1);`
188	`_fmemmove(f->cursor->payload + f->cursor->len, buf, len);`	188	`_fmemmove(f->cursor->payload + f->cursor->len, buf, len);`
189	`f->cursor->len += len;`	189	`f->cursor->len += len;`
190		190
191	`return(0);`	191	`return(0);`
192	`}`	192	`}`
193		193
194		194
195	`static void db_rewind(struct file *db) {`	195	`static void db_rewind(struct file *db) {`
196	`if (db->cursor == NULL) return;`	196	`if (db->cursor == NULL) return;`
197	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	197	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
198	`db->curline = 0;`	198	`db->curline = 0;`
199	`}`	199	`}`
200		200
201		201
202	`static void ui_basic(const struct file *db) {`	202	`static void ui_basic(const struct file *db) {`
203	`const char s = svarlang_strid(0); / HELP */`	203	`const char s = svarlang_strid(0); / HELP */`
204	`unsigned char helpcol = screenw - strlen(s);`	204	`unsigned char helpcol = screenw - strlen(s);`
205		205
206	`/* fill status bar with background (without modflag as it is refreshed by ui_refresh) */`	206	`/* fill status bar with background (without modflag as it is refreshed by ui_refresh) */`
207	`mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);`	207	`mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);`
208		208
209	`/* filename */`	209	`/* filename */`
210	`{`	210	`{`
211	`const char *fn = db->fname;`	211	`const char *fn = db->fname;`
212	`if (*fn == 0) fn = svarlang_str(0, 1);`	212	`if (*fn == 0) fn = svarlang_str(0, 1);`
213	`mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);`	213	`mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);`
214	`}`	214	`}`
215		215
216	`/* eol type */`	216	`/* eol type */`
217	`{`	217	`{`
218	`const char *eoltype = "CRLF";`	218	`const char *eoltype = "CRLF";`
219	`if (db->lfonly) eoltype = "LF";`	219	`if (db->lfonly) eoltype = "LF";`
220	`mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);`	220	`mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);`
221	`}`	221	`}`
222		222
223	`mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);`	223	`mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);`
224	`}`	224	`}`
225		225
226		226
227	`static void ui_msg(const char msg1, const char msg2, unsigned char attr) {`	227	`static void ui_msg(const char msg1, const char msg2, unsigned char attr) {`
228	`unsigned short x, y, msglen, i;`	228	`unsigned short x, y, msglen, i;`
229	`unsigned char msg2flag = 0;`	229	`unsigned char msg2flag = 0;`
230		230
231	`msglen = strlen(msg1);`	231	`msglen = strlen(msg1);`
232	`if (msg2) {`	232	`if (msg2) {`
233	`msg2flag = 1;`	233	`msg2flag = 1;`
234	`i = strlen(msg2);`	234	`i = strlen(msg2);`
235	`if (i > msglen) msglen = i;`	235	`if (i > msglen) msglen = i;`
236	`}`	236	`}`
237		237
238	`y = (screenh - 6) >> 1;`	238	`y = (screenh - 6) >> 1;`
239	`x = (screenw - msglen - 4) >> 1;`	239	`x = (screenw - msglen - 4) >> 1;`
240	`for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`	240	`for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`
241	`x++;`	241	`x++;`
242	`mdr_cout_str(y+1, x, msg1, attr, msglen);`	242	`mdr_cout_str(y+1, x, msg1, attr, msglen);`
243	`if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);`	243	`if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);`
244		244
245	`if (uidirty.from > y) uidirty.from = y;`	245	`if (uidirty.from > y) uidirty.from = y;`
246	`if (uidirty.to < y+4) uidirty.to = y+4;`	246	`if (uidirty.to < y+4) uidirty.to = y+4;`
247	`}`	247	`}`
248		248
249		249
250	`static void ui_help(void) {`	250	`static void ui_help(void) {`
251	`#define MAXLINLEN 35`	251	`#define MAXLINLEN 35`
252	`unsigned char i, offset;`	252	`unsigned char i, offset;`
253	`offset = (screenw - MAXLINLEN + 2) >> 1;`	253	`offset = (screenw - MAXLINLEN + 2) >> 1;`
254		254
255	`for (i = 2; i < 18; i++) {`	255	`for (i = 2; i < 18; i++) {`
256	`mdr_cout_char_rep(i, offset - 2, ' ', SCHEME_STBAR1, MAXLINLEN + 2);`	256	`mdr_cout_char_rep(i, offset - 2, ' ', SCHEME_STBAR1, MAXLINLEN + 2);`
257	`}`	257	`}`
258		258
259	`for (i = 0; i < 20; i++) {`	259	`for (i = 0; i < 20; i++) {`
260	`const char *s = svarlang_str(8, i);`	260	`const char *s = svarlang_str(8, i);`
261	`if (s[0] == 0) break;`	261	`if (s[0] == 0) break;`
262	`if (s[0] == '.') continue;`	262	`if (s[0] == '.') continue;`
263	`mdr_cout_locate(3 + i, offset + mdr_cout_str(3 + i, offset, s, SCHEME_STBAR1, MAXLINLEN));`	263	`mdr_cout_locate(3 + i, offset + mdr_cout_str(3 + i, offset, s, SCHEME_STBAR1, MAXLINLEN));`
264	`}`	264	`}`
265		265
266	`keyb_getkey();`	266	`keyb_getkey();`
267	`#undef MAXLINLEN`	267	`#undef MAXLINLEN`
268	`}`	268	`}`
269		269
270		270
271	`static void ui_refresh(const struct file *db) {`	271	`static void ui_refresh(const struct file *db) {`
272	`unsigned char x;`	272	`unsigned char x;`
273	`const struct line far *l;`	273	`const struct line far *l;`
274	`unsigned char y = db->cursorposy;`	274	`unsigned char y = db->cursorposy;`
275		275
276	`#ifdef DBG_REFRESH`	276	`#ifdef DBG_REFRESH`
277	`static char m = 'a';`	277	`static char m = 'a';`
278	`m++;`	278	`m++;`
279	`if (m > 'z') m = 'a';`	279	`if (m > 'z') m = 'a';`
280	`#endif`	280	`#endif`
281		281
282	`/* rewind cursor line to first line that needs redrawing */`	282	`/* rewind cursor line to first line that needs redrawing */`
283	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`	283	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`
284		284
285	`/* iterate over lines and redraw whatever needs to be redrawn */`	285	`/* iterate over lines and redraw whatever needs to be redrawn */`
286	`for (; l != NULL; l = l->next, y++) {`	286	`for (; l != NULL; l = l->next, y++) {`
287		287
288	`/* skip lines that do not need to be refreshed */`	288	`/* skip lines that do not need to be refreshed */`
289	`if (y < uidirty.from) continue;`	289	`if (y < uidirty.from) continue;`
290	`if (y > uidirty.to) break;`	290	`if (y > uidirty.to) break;`
291		291
292	`x = 0;`	292	`x = 0;`
293	`if (db->xoffset < l->len) {`	293	`if (db->xoffset < l->len) {`
294	`unsigned char i, limit;`	294	`unsigned char i, limit;`
295	`if (l->len - db->xoffset < screenw) {`	295	`if (l->len - db->xoffset < screenw) {`
296	`limit = l->len;`	296	`limit = l->len;`
297	`} else {`	297	`} else {`
298	`limit = db->xoffset + screenw - 1;`	298	`limit = db->xoffset + screenw - 1;`
299	`}`	299	`}`
300	`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);`
301	`}`	301	`}`
302		302
303	`/* write empty spaces until end of line */`	303	`/* write empty spaces until end of line */`
304	`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);`
305		305
306	`#ifdef DBG_REFRESH`	306	`#ifdef DBG_REFRESH`
307	`mdr_cout_char(y, 0, m, SCHEME_STBAR1);`	307	`mdr_cout_char(y, 0, m, SCHEME_STBAR1);`
308	`#endif`	308	`#endif`
309		309
310	`if (y == screenh - 2) break;`	310	`if (y == screenh - 2) break;`
311	`}`	311	`}`
312		312
313	`/* 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) */`
314	`if (l == NULL) {`	314	`if (l == NULL) {`
315	`while ((y < screenh - 1) && (y < uidirty.to)) {`	315	`while ((y < screenh - 1) && (y < uidirty.to)) {`
316	`mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);`	316	`mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);`
317	`}`	317	`}`
318	`}`	318	`}`
319		319
320	`/* "file changed" flag */`	320	`/* "file changed" flag */`
321	`{`	321	`{`
322	`char flg = ' ';`	322	`char flg = ' ';`
323	`if (db->modflag) flg = '*';`	323	`if (db->modflag) flg = '*';`
324	`mdr_cout_char(screenh - 1, 0, flg, SCHEME_STBAR1);`	324	`mdr_cout_char(screenh - 1, 0, flg, SCHEME_STBAR1);`
325	`}`	325	`}`
326		326
327	`/* scroll bar */`	327	`/* scroll bar */`
328	`for (y = 0; y < (screenh - 1); y++) {`	328	`for (y = 0; y < (screenh - 1); y++) {`
329	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);`	329	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);`
330	`}`	330	`}`
331		331
332	`/* scroll cursor */`	332	`/* scroll cursor */`
333	`if (db->totlines >= screenh) {`	333	`if (db->totlines >= screenh) {`
334	`unsigned short topline = db->curline - db->cursorposy;`	334	`unsigned short topline = db->curline - db->cursorposy;`
335	`unsigned short col;`	335	`unsigned short col;`
336	`unsigned short totlines = db->totlines - screenh + 1;`	336	`unsigned short totlines = db->totlines - screenh + 1;`
337	`if (db->totlines - screenh > screenh) {`	337	`if (db->totlines - screenh > screenh) {`
338	`col = topline / (totlines / (screenh - 1));`	338	`col = topline / (totlines / (screenh - 1));`
339	`} else {`	339	`} else {`
340	`col = topline * (screenh - 1) / totlines;`	340	`col = topline * (screenh - 1) / totlines;`
341	`}`	341	`}`
342	`if (col >= screenh - 1) col = screenh - 2;`	342	`if (col >= screenh - 1) col = screenh - 2;`
343	`mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);`	343	`mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);`
344	`}`	344	`}`
345	`}`	345	`}`
346		346
347		347
348	`static void check_cursor_not_after_eol(struct file *db) {`	348	`static void check_cursor_not_after_eol(struct file *db) {`
349	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	349	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
350		350
351	`if (db->cursor->len < db->xoffset) {`	351	`if (db->cursor->len < db->xoffset) {`
352	`db->cursorposx = 0;`	352	`db->cursorposx = 0;`
353	`db->xoffset = db->cursor->len;`	353	`db->xoffset = db->cursor->len;`
354	`uidirty.from = 0;`	354	`uidirty.from = 0;`
355	`uidirty.to = 0xff;`	355	`uidirty.to = 0xff;`
356	`} else {`	356	`} else {`
357	`db->cursorposx = db->cursor->len - db->xoffset;`	357	`db->cursorposx = db->cursor->len - db->xoffset;`
358	`}`	358	`}`
359	`}`	359	`}`
360		360
361		361
362	`static void cursor_up(struct file *db) {`	362	`static void cursor_up(struct file *db) {`
363	`if (db->cursor->prev != NULL) {`	363	`if (db->cursor->prev != NULL) {`
364	`db->curline -= 1;`	364	`db->curline -= 1;`
365	`db->cursor = db->cursor->prev;`	365	`db->cursor = db->cursor->prev;`
366	`if (db->cursorposy == 0) {`	366	`if (db->cursorposy == 0) {`
367	`uidirty.from = 0;`	367	`uidirty.from = 0;`
368	`uidirty.to = 0xff;`	368	`uidirty.to = 0xff;`
369	`} else {`	369	`} else {`
370	`db->cursorposy -= 1;`	370	`db->cursorposy -= 1;`
371	`}`	371	`}`
372	`}`	372	`}`
373	`}`	373	`}`
374		374
375		375
376	`static void cursor_eol(struct file *db) {`	376	`static void cursor_eol(struct file *db) {`
377	`/* adjust xoffset to make sure eol is visible on screen */`	377	`/* adjust xoffset to make sure eol is visible on screen */`
378	`if (db->xoffset > db->cursor->len) {`	378	`if (db->xoffset > db->cursor->len) {`
379	`db->xoffset = db->cursor->len - 1;`	379	`db->xoffset = db->cursor->len - 1;`
380	`uidirty.from = 0;`	380	`uidirty.from = 0;`
381	`uidirty.to = 0xff;`	381	`uidirty.to = 0xff;`
382	`}`	382	`}`
383		383
384	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	384	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
385	`db->xoffset = db->cursor->len - screenw + 2;`	385	`db->xoffset = db->cursor->len - screenw + 2;`
386	`uidirty.from = 0;`	386	`uidirty.from = 0;`
387	`uidirty.to = 0xff;`	387	`uidirty.to = 0xff;`
388	`}`	388	`}`
389	`db->cursorposx = db->cursor->len - db->xoffset;`	389	`db->cursorposx = db->cursor->len - db->xoffset;`
390	`}`	390	`}`
391		391
392		392
393	`static void cursor_down(struct file *db) {`	393	`static void cursor_down(struct file *db) {`
394	`if (db->cursor->next != NULL) {`	394	`if (db->cursor->next != NULL) {`
395	`db->curline += 1;`	395	`db->curline += 1;`
396	`db->cursor = db->cursor->next;`	396	`db->cursor = db->cursor->next;`
397	`if (db->cursorposy < screenh - 2) {`	397	`if (db->cursorposy < screenh - 2) {`
398	`db->cursorposy += 1;`	398	`db->cursorposy += 1;`
399	`} else {`	399	`} else {`
400	`uidirty.from = 0;`	400	`uidirty.from = 0;`
401	`uidirty.to = 0xff;`	401	`uidirty.to = 0xff;`
402	`}`	402	`}`
403	`}`	403	`}`
404	`}`	404	`}`
405		405
406		406
407	`static void cursor_left(struct file *db) {`	407	`static void cursor_left(struct file *db) {`
408	`if (db->cursorposx > 0) {`	408	`if (db->cursorposx > 0) {`
409	`db->cursorposx -= 1;`	409	`db->cursorposx -= 1;`
410	`} else if (db->xoffset > 0) {`	410	`} else if (db->xoffset > 0) {`
411	`db->xoffset -= 1;`	411	`db->xoffset -= 1;`
412	`uidirty.from = 0;`	412	`uidirty.from = 0;`
413	`uidirty.to = 0xff;`	413	`uidirty.to = 0xff;`
414	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	414	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
415	`cursor_up(db);`	415	`cursor_up(db);`
416	`cursor_eol(db);`	416	`cursor_eol(db);`
417	`}`	417	`}`
418	`}`	418	`}`
419		419
420		420
421	`static void cursor_home(struct file *db) {`	421	`static void cursor_home(struct file *db) {`
422	`db->cursorposx = 0;`	422	`db->cursorposx = 0;`
423	`if (db->xoffset != 0) {`	423	`if (db->xoffset != 0) {`
424	`db->xoffset = 0;`	424	`db->xoffset = 0;`
425	`uidirty.from = 0;`	425	`uidirty.from = 0;`
426	`uidirty.to = 0xff;`	426	`uidirty.to = 0xff;`
427	`}`	427	`}`
428	`}`	428	`}`
429		429
430		430
431	`static void cursor_right(struct file *db) {`	431	`static void cursor_right(struct file *db) {`
432	`if (db->cursor->len > db->xoffset + db->cursorposx) {`	432	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
433	`if (db->cursorposx < screenw - 2) {`	433	`if (db->cursorposx < screenw - 2) {`
434	`db->cursorposx += 1;`	434	`db->cursorposx += 1;`
435	`} else {`	435	`} else {`
436	`db->xoffset += 1;`	436	`db->xoffset += 1;`
437	`uidirty.from = 0;`	437	`uidirty.from = 0;`
438	`uidirty.to = 0xff;`	438	`uidirty.to = 0xff;`
439	`}`	439	`}`
440	`} else {`	440	`} else {`
441	`cursor_down(db);`	441	`cursor_down(db);`
442	`cursor_home(db);`	442	`cursor_home(db);`
443	`}`	443	`}`
444	`}`	444	`}`
445		445
446		446
447	`static void del(struct file *db) {`	447	`static void del(struct file *db) {`
448	`if (db->cursorposx + db->xoffset < db->cursor->len) {`	448	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
449	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`	449	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`
450	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	450	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
451	`uidirty.from = db->cursorposy;`	451	`uidirty.from = db->cursorposy;`
452	`uidirty.to = db->cursorposy;`	452	`uidirty.to = db->cursorposy;`
453	`db->modflag = 1;`	453	`db->modflag = 1;`
454	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	454	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`
455	`struct line far *nextline = db->cursor->next;`	455	`struct line far *nextline = db->cursor->next;`
456	`if (db->cursor->next->len > 0) {`	456	`if (db->cursor->next->len > 0) {`
457	`if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {`	457	`if (curline_resize(db, db->cursor->len + db->cursor->next->len + 1) == 0) {`
458	`_fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	458	`_fmemmove(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
459	`db->cursor->len += db->cursor->next->len;`	459	`db->cursor->len += db->cursor->next->len;`
460	`}`	460	`}`
461	`}`	461	`}`
462		462
463	`db->cursor->next = db->cursor->next->next;`	463	`db->cursor->next = db->cursor->next->next;`
464	`db->cursor->next->prev = db->cursor;`	464	`db->cursor->next->prev = db->cursor;`
465		465
466	`line_free(nextline);`	466	`line_free(nextline);`
467	`uidirty.from = db->cursorposy;`	467	`uidirty.from = db->cursorposy;`
468	`uidirty.to = 0xff;`	468	`uidirty.to = 0xff;`
469	`db->totlines -= 1;`	469	`db->totlines -= 1;`
470	`db->modflag = 1;`	470	`db->modflag = 1;`
471	`}`	471	`}`
472	`}`	472	`}`
473		473
474		474
475	`static void bkspc(struct file *db) {`	475	`static void bkspc(struct file *db) {`
476		476
477	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	477	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
478	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	478	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
479		479
480	`cursor_left(db);`	480	`cursor_left(db);`
481	`del(db);`	481	`del(db);`
482	`}`	482	`}`
483		483
484		484
485	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	485	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
486	`* of argc and argv, saves some 330 bytes of binary size */`	486	`* of argc and argv, saves some 330 bytes of binary size */`
487	`static char *parseargv(void) {`	487	`static char *parseargv(void) {`
488	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	488	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
489	`unsigned char count = 0;`	489	`unsigned char count = 0;`
490	`char *argv[4];`	490	`char *argv[4];`
491		491
492	`while (count < 4) {`	492	`while (count < 4) {`
493	`/* jump to nearest arg */`	493	`/* jump to nearest arg */`
494	`while (*tail == ' ') {`	494	`while (*tail == ' ') {`
495	`*tail = 0;`	495	`*tail = 0;`
496	`tail++;`	496	`tail++;`
497	`}`	497	`}`
498		498
499	`if (*tail == '\r') {`	499	`if (*tail == '\r') {`
500	`*tail = 0;`	500	`*tail = 0;`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1548 – Rev 1340 → 1341