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


/* Sved, the SvarDOS editor
 *
 * Copyright (C) 2023 Mateusz Viste
 *
 * Sved is released under the terms of the MIT license.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
 
#include <dos.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>   /* _fcalloc() */
 
#include "mdr\bios.h"
#include "mdr\cout.h"
#include "mdr\dos.h"
#include "mdr\keyb.h"
 
#include "svarlang\svarlang.h"
 
 
/*****************************************************************************
 * global variables and definitions                                          *
 *****************************************************************************/
 
/* 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                                                                 *
 *****************************************************************************/
 
/* adds a new line at cursor position into file linked list and advance cursor
 * returns non-zero on error */
static int line_add(struct file *db, const char far *line, unsigned short slen) {
  struct line far *l;
 
  l = _fcalloc(1, sizeof(struct line) + slen);
  if (l == NULL) return(-1);
 
  l->prev = db->cursor;
  if (db->cursor) {
    l->next = db->cursor->next;
    db->cursor->next = l;
    l->next->prev = l;
  }
  db->cursor = l;
  _fmemcpy(l->payload, line, slen);
  l->len = slen;
 
  db->totlines += 1;
  db->curline += 1;
 
  return(0);
}
 
 
static void ui_getstring(const char *query, char *s, unsigned char maxlen) {
  unsigned char len = 0, y, x;
  int k;
 
  if (maxlen == 0) return;
  maxlen--; /* make room for the nul terminator */
 
  y = screenh - 1;
 
  /* print query string */
  x = mdr_cout_str(y, 0, query, SCHEME_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) {
  struct line far *n;
  if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */
  n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);
  if (n == NULL) return(-1);
  f->cursor = n;
  _fmemcpy(f->cursor->payload + f->cursor->len, buf, len);
  f->cursor->len += len;
 
  /* rewire the linked list */
  if (f->cursor->next) f->cursor->next->prev = f->cursor;
  if (f->cursor->prev) f->cursor->prev->next = f->cursor;
 
  return(0);
}
 
 
static void db_rewind(struct file *db) {
  if (db->cursor == NULL) return;
  while (db->cursor->prev) db->cursor = db->cursor->prev;
  db->curline = 0;
}
 
 
static void 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 short i, offset;
  offset = (screenw - MAXLINLEN + 2) >> 1;
 
  mdr_cout_cursor_hide();
  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_str(3 + i, offset, s, SCHEME_STBAR1, MAXLINLEN);
  }
 
 
 
 
 
  keyb_getkey();
  mdr_cout_cursor_show();
#undef MAXLINLEN
}
 
 
static void ui_refresh(const struct file *db) {
  unsigned char x;
  const struct line far *l;
  unsigned char y = db->cursorposy;
 
#ifdef DBG_REFRESH
  static char m = 'a';
  m++;
  if (m > 'z') m = 'a';
#endif
 
  /* rewind cursor line to first line that needs redrawing */
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
 
  /* iterate over lines and redraw whatever needs to be redrawn */
  for (; l != NULL; l = l->next, y++) {
 
    /* skip lines that do not need to be refreshed */
    if (y < uidirty.from) continue;
    if (y > uidirty.to) break;
 
    x = 0;
    if (db->xoffset < l->len) {
      unsigned char i, limit;
      if (l->len - db->xoffset < screenw) {
        limit = l->len;
      } else {
        limit = db->xoffset + screenw - 1;
      }
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_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) {
      void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);
      if (newptr != NULL) {
        db->cursor = newptr;
        _fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
        db->cursor->len += db->cursor->next->len;
      }
    }
    db->cursor->next = db->cursor->next->next;
    db->cursor->next->prev = db->cursor;
    if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
    _ffree(nextline);
    uidirty.from = db->cursorposy;
    uidirty.to = 0xff;
    db->totlines -= 1;
    db->modflag = 1;
  }
}
 
 
static void bkspc(struct file *db) {
 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
  if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
 
  cursor_left(db);
  del(db);
}
 
 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
 * of argc and argv, saves some 330 bytes of binary size */
static char *parseargv(void) {
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
  unsigned char count = 0;
  char *argv[4];
 
  while (count < 4) {
    /* jump to nearest arg */
    while (*tail == ' ') {
      *tail = 0;
      tail++;
    }
 
    if (*tail == '\r') {
      *tail = 0;
      break;
    }
 
    argv[count++] = tail;
 
    /* jump to next delimiter */
    while ((*tail != ' ') && (*tail != '\r')) tail++;
  }
 
  /* check args now */
  if (count == 0) return("");
 
  return(argv[0]);
}
 
 
static struct file *loadfile(const char *fname) {
  char buff[512]; /* read one entire sector at a time (faster) */
  char *buffptr;
  unsigned int len, llen;
  int fd;
  unsigned char eolfound;
  struct file *db;
 
  len = strlen(fname) + 1;
  db = calloc(1, sizeof(struct file));
  if (db == NULL) return(NULL);
  memcpy(db->fname, fname, len);
 
  if (*fname == 0) goto SKIPLOADING;
 
  if (_dos_open(fname, O_RDONLY, &fd) != 0) {
    mdr_coutraw_puts("Failed to open file:");
    mdr_coutraw_puts(fname);
    free(db);
    return(NULL);
  }
 
  db->lfonly = 1;
 
  /* start by adding an empty line */
  if (line_add(db, NULL, 0) != 0) {
    /* TODO ERROR HANDLING */
  }
 
  for (eolfound = 0;;) {
    unsigned short consumedbytes;
 
    if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) || (len == 0)) break;
    buffptr = buff;
 
    FINDLINE:
 
    /* look for nearest \n */
    for (consumedbytes = 0;; consumedbytes++) {
      if (consumedbytes == len) {
        llen = consumedbytes;
        break;
      }
      if (buffptr[consumedbytes] == '\r') {
        llen = consumedbytes;
        consumedbytes++;
        db->lfonly = 0;
        break;
      }
      if (buffptr[consumedbytes] == '\n') {
        eolfound = 1;
        llen = consumedbytes;
        consumedbytes++;
        break;
      }
    }
 
    /* consumedbytes is the amount of bytes processed from buffptr,
     * llen is the length of line's payload (without its line terminator) */
 
    /* append content, if line is non-empty */
    if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {
      mdr_coutraw_puts("out of memory");
      free(db);
      db = NULL;
      break;
    }
 
    /* add a new line if necessary */
    if (eolfound) {
      if (line_add(db, NULL, 0) != 0) {
      /* TODO ERROR HANDLING */
        mdr_coutraw_puts("out of memory");
        free(db);
        db = NULL;
        break;
      }
      eolfound = 0;
    }
 
    /* anything left? process the buffer leftover again */
    if (consumedbytes < len) {
      len -= consumedbytes;
      buffptr += consumedbytes;
      goto FINDLINE;
    }
 
  }
 
  _dos_close(fd);
 
  SKIPLOADING:
 
  /* add an empty line at end if not present already, also rewind cursor to top of file */
  if (db != NULL) {
    if ((db->cursor == NULL) || (db->cursor->len != 0)) line_add(db, NULL, 0);
    db_rewind(db);
  }
 
  return(db);
}
 
 
static int savefile(const struct file *db, const char *newfname) {
  int fd;
  const struct line far *l;
  unsigned bytes;
  unsigned char eollen;
  unsigned char eolbuf[2];
  int errflag = 0;
 
  /* either create a new file if newfname provided, or... */
  if (newfname) {
    if (_dos_creatnew(newfname, _A_NORMAL, &fd) != 0) return(-1);
  } else { /* ...open db->fname */
    if (_dos_open(db->fname, O_WRONLY, &fd) != 0) return(-1);
  }
 
  l = db->cursor;
  while (l->prev) l = l->prev;
 
  /* preset line terminators */
  if (db->lfonly) {
    eolbuf[0] = '\n';
    eollen = 1;
  } else {
    eolbuf[0] = '\r';
    eolbuf[1] = '\n';
    eollen = 2;
  }
 
  while (l) {
    /* do not write the last empty line, it is only useful for edition */
    if (l->len != 0) {
      errflag |= _dos_write(fd, l->payload, l->len, &bytes);
    } else if (l->next == NULL) {
      break;
    }
    errflag |= _dos_write(fd, eolbuf, eollen, &bytes);
    l = l->next;
  }
 
  errflag |= _dos_close(fd);
 
  return(errflag);
}
 
 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
  struct line far *n;
  n = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + len);
  if (n != NULL) {
    unsigned short off = db->xoffset + db->cursorposx;
    db->modflag = 1;
    if (n->prev) n->prev->next = n;
    if (n->next) n->next->prev = n;
    db->cursor = n;
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
    db->cursor->len += len;
    uidirty.from = db->cursorposy;
    uidirty.to = db->cursorposy;
    while (len--) {
      db->cursor->payload[off++] = *databuf;
      databuf++;
      cursor_right(db);
    }
  }
}
 
 
int main(void) {
  const char *fname;
  struct file *db;
 
  {
    char nlspath[128], lang[8];
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
  }
 
  fname = parseargv();
 
  if (fname == NULL) {
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
    return(0);
  }
 
  /* load file */
  db = loadfile(fname);
  if (db == NULL) return(1);
 
  if (mdr_cout_init(&screenw, &screenh)) {
    /* load 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 1334	Rev 1335
1	`/* Sved, the SvarDOS editor`	1	`/* Sved, the SvarDOS editor`
2	`*`	2	`*`
3	`* Copyright (C) 2023 Mateusz Viste`	3	`* Copyright (C) 2023 Mateusz Viste`
4	`*`	4	`*`
5	`* Sved is released under the terms of the MIT license.`	5	`* Sved is released under the terms of the MIT license.`
6	`*`	6	`*`
7	`* Permission is hereby granted, free of charge, to any person obtaining a copy`	7	`* Permission is hereby granted, free of charge, to any person obtaining a copy`
8	`* of this software and associated documentation files (the "Software"), to`	8	`* of this software and associated documentation files (the "Software"), to`
9	`* deal in the Software without restriction, including without limitation the`	9	`* deal in the Software without restriction, including without limitation the`
10	`* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or`	10	`* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or`
11	`* sell copies of the Software, and to permit persons to whom the Software is`	11	`* sell copies of the Software, and to permit persons to whom the Software is`
12	`* furnished to do so, subject to the following conditions:`	12	`* furnished to do so, subject to the following conditions:`
13	`*`	13	`*`
14	`* The above copyright notice and this permission notice shall be included in`	14	`* The above copyright notice and this permission notice shall be included in`
15	`* all copies or substantial portions of the Software.`	15	`* all copies or substantial portions of the Software.`
16	`*`	16	`*`
17	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`	17	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`
18	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`	18	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`
19	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`	19	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`
20	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`	20	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`
21	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`	21	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`
22	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS`	22	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS`
23	`* IN THE SOFTWARE.`	23	`* IN THE SOFTWARE.`
24	`*/`	24	`*/`
25		25
26	`#include <dos.h>`	26	`#include <dos.h>`
27	`#include <fcntl.h>`	27	`#include <fcntl.h>`
28	`#include <stdlib.h>`	28	`#include <stdlib.h>`
29	`#include <string.h>`	29	`#include <string.h>`
30	`#include <malloc.h> /* _fcalloc() */`	30	`#include <malloc.h> /* _fcalloc() */`
31		31
32	`#include "mdr\bios.h"`	32	`#include "mdr\bios.h"`
33	`#include "mdr\cout.h"`	33	`#include "mdr\cout.h"`
34	`#include "mdr\dos.h"`	34	`#include "mdr\dos.h"`
35	`#include "mdr\keyb.h"`	35	`#include "mdr\keyb.h"`
36		36
37	`#include "svarlang\svarlang.h"`	37	`#include "svarlang\svarlang.h"`
38		38
39		39
40	`/*****************************************************************************`	40	`/*****************************************************************************`
41	`* global variables and definitions *`	41	`* global variables and definitions *`
42	`*****************************************************************************/`	42	`*****************************************************************************/`
43		43
44	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`	44	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`
45	`static unsigned char SCHEME_TEXT = 0x07,`	45	`static unsigned char SCHEME_TEXT = 0x07,`
46	`SCHEME_STBAR1 = 0x70,`	46	`SCHEME_STBAR1 = 0x70,`
47	`SCHEME_STBAR2 = 0x70,`	47	`SCHEME_STBAR2 = 0x70,`
48	`SCHEME_STBAR3 = 0xf0,`	48	`SCHEME_STBAR3 = 0xf0,`
49	`SCHEME_SCROLL = 0x70,`	49	`SCHEME_SCROLL = 0x70,`
50	`SCHEME_MSG = 0x70,`	50	`SCHEME_MSG = 0x70,`
51	`SCHEME_ERR = 0xf0;`	51	`SCHEME_ERR = 0xf0;`
52		52
53	`static unsigned char screenw, screenh;`	53	`static unsigned char screenw, screenh;`
54		54
55	`static struct {`	55	`static struct {`
56	`unsigned char from;`	56	`unsigned char from;`
57	`unsigned char to;`	57	`unsigned char to;`
58	`} uidirty = {0, 0xff}; /* make sure to redraw entire UI at first run */`	58	`} uidirty = {0, 0xff}; /* make sure to redraw entire UI at first run */`
59		59
60	`#define SCROLL_CURSOR 0xB1`	60	`#define SCROLL_CURSOR 0xB1`
61		61
62	`struct line {`	62	`struct line {`
63	`struct line far *prev;`	63	`struct line far *prev;`
64	`struct line far *next;`	64	`struct line far *next;`
65	`unsigned short len;`	65	`unsigned short len;`
66	`char payload[1];`	66	`char payload[1];`
67	`};`	67	`};`
68		68
69	`struct file {`	69	`struct file {`
70	`int fd;`	70	`int fd;`
71	`struct line far *cursor;`	71	`struct line far *cursor;`
72	`unsigned short xoffset;`	72	`unsigned short xoffset;`
73	`unsigned char cursorposx;`	73	`unsigned char cursorposx;`
74	`unsigned char cursorposy;`	74	`unsigned char cursorposy;`
75	`unsigned short totlines;`	75	`unsigned short totlines;`
76	`unsigned short curline;`	76	`unsigned short curline;`
77	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`	77	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`
78	`char modflag; /* non-zero if file has been modified since last save */`	78	`char modflag; /* non-zero if file has been modified since last save */`
79	`char fname[128];`	79	`char fname[128];`
80	`};`	80	`};`
81		81
82		82
83	`/*****************************************************************************`	83	`/*****************************************************************************`
84	`* functions *`	84	`* functions *`
85	`*****************************************************************************/`	85	`*****************************************************************************/`
86		86
87	`/* adds a new line at cursor position into file linked list and advance cursor`	87	`/* adds a new line at cursor position into file linked list and advance cursor`
88	`* returns non-zero on error */`	88	`* returns non-zero on error */`
89	`static int line_add(struct file db, const char far line, unsigned short slen) {`	89	`static int line_add(struct file db, const char far line, unsigned short slen) {`
90	`struct line far *l;`	90	`struct line far *l;`
91		91
92	`l = _fcalloc(1, sizeof(struct line) + slen);`	92	`l = _fcalloc(1, sizeof(struct line) + slen);`
93	`if (l == NULL) return(-1);`	93	`if (l == NULL) return(-1);`
94		94
95	`l->prev = db->cursor;`	95	`l->prev = db->cursor;`
96	`if (db->cursor) {`	96	`if (db->cursor) {`
97	`l->next = db->cursor->next;`	97	`l->next = db->cursor->next;`
98	`db->cursor->next = l;`	98	`db->cursor->next = l;`
99	`l->next->prev = l;`	99	`l->next->prev = l;`
100	`}`	100	`}`
101	`db->cursor = l;`	101	`db->cursor = l;`
102	`_fmemcpy(l->payload, line, slen);`	102	`_fmemcpy(l->payload, line, slen);`
103	`l->len = slen;`	103	`l->len = slen;`
104		104
105	`db->totlines += 1;`	105	`db->totlines += 1;`
106	`db->curline += 1;`	106	`db->curline += 1;`
107		107
108	`return(0);`	108	`return(0);`
109	`}`	109	`}`
110		110
111		111
112	`static void ui_getstring(const char query, char s, unsigned char maxlen) {`	112	`static void ui_getstring(const char query, char s, unsigned char maxlen) {`
113	`unsigned char len = 0, y, x;`	113	`unsigned char len = 0, y, x;`
114	`int k;`	114	`int k;`
115		115
116	`if (maxlen == 0) return;`	116	`if (maxlen == 0) return;`
117	`maxlen--; /* make room for the nul terminator */`	117	`maxlen--; /* make room for the nul terminator */`
118		118
119	`y = screenh - 1;`	119	`y = screenh - 1;`
120		120
121	`/* print query string */`	121	`/* print query string */`
122	`x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);`	122	`x = mdr_cout_str(y, 0, query, SCHEME_STBAR3, 40);`
123	`mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);`	123	`mdr_cout_char_rep(y, x++, ' ', SCHEME_STBAR3, screenw - x);`
124		124
125	`for (;;) {`	125	`for (;;) {`
126	`mdr_cout_locate(y, x + len);`	126	`mdr_cout_locate(y, x + len);`
127	`k = keyb_getkey();`	127	`k = keyb_getkey();`
128		128
129	`if (k == 0x1b) return; /* ESC */`	129	`if (k == 0x1b) return; /* ESC */`
130		130
131	`if (k == '\r') {`	131	`if (k == '\r') {`
132	`s[len] = 0;`	132	`s[len] = 0;`
133	`return;`	133	`return;`
134	`}`	134	`}`
135		135
136	`if ((k == 0x08) && (len > 0)) { /* BKSPC */`	136	`if ((k == 0x08) && (len > 0)) { /* BKSPC */`
137	`len--;`	137	`len--;`
138	`mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);`	138	`mdr_cout_char(y, x + len, ' ', SCHEME_STBAR3);`
139	`continue;`	139	`continue;`
140	`}`	140	`}`
141		141
142	`if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {`	142	`if ((k <= 0xff) && (k >= ' ') && (len < maxlen)) {`
143	`mdr_cout_char(y, x + len, k, SCHEME_STBAR3);`	143	`mdr_cout_char(y, x + len, k, SCHEME_STBAR3);`
144	`s[len++] = k;`	144	`s[len++] = k;`
145	`}`	145	`}`
146		146
147	`}`	147	`}`
148	`}`	148	`}`
149		149
150		150
151	`/* append a nul-terminated string to line at cursor position */`	151	`/* append a nul-terminated string to line at cursor position */`
152	`static int line_append(struct file f, const char far buf, unsigned short len) {`	152	`static int line_append(struct file f, const char far buf, unsigned short len) {`
153	`struct line far *n;`	153	`struct line far *n;`
154	`if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */`	154	`if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */`
155	`n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);`	155	`n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);`
156	`if (n == NULL) return(-1);`	156	`if (n == NULL) return(-1);`
157	`f->cursor = n;`	157	`f->cursor = n;`
158	`_fmemcpy(f->cursor->payload + f->cursor->len, buf, len);`	158	`_fmemcpy(f->cursor->payload + f->cursor->len, buf, len);`
159	`f->cursor->len += len;`	159	`f->cursor->len += len;`
160		160
161	`/* rewire the linked list */`	161	`/* rewire the linked list */`
162	`if (f->cursor->next) f->cursor->next->prev = f->cursor;`	162	`if (f->cursor->next) f->cursor->next->prev = f->cursor;`
163	`if (f->cursor->prev) f->cursor->prev->next = f->cursor;`	163	`if (f->cursor->prev) f->cursor->prev->next = f->cursor;`
164		164
165	`return(0);`	165	`return(0);`
166	`}`	166	`}`
167		167
168		168
169	`static void db_rewind(struct file *db) {`	169	`static void db_rewind(struct file *db) {`
170	`if (db->cursor == NULL) return;`	170	`if (db->cursor == NULL) return;`
171	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	171	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
172	`db->curline = 0;`	172	`db->curline = 0;`
173	`}`	173	`}`
174		174
175		175
176	`static void ui_basic(const struct file *db) {`	176	`static void ui_basic(const struct file *db) {`
177	`const char s = svarlang_strid(0); / HELP */`	177	`const char s = svarlang_strid(0); / HELP */`
178	`unsigned char helpcol = screenw - (strlen(s) + 4);`	178	`unsigned char helpcol = screenw - strlen(s);`
179		179
180	`/* fill status bar with background (without modflag as it is refreshed by ui_refresh) */`	180	`/* fill status bar with background (without modflag as it is refreshed by ui_refresh) */`
181	`mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);`	181	`mdr_cout_char_rep(screenh - 1, 1, ' ', SCHEME_STBAR1, screenw - 1);`
182		182
183	`/* filename */`	183	`/* filename */`
184	`{`	184	`{`
185	`const char *fn = db->fname;`	185	`const char *fn = db->fname;`
186	`if (*fn == 0) fn = svarlang_str(0, 1);`	186	`if (*fn == 0) fn = svarlang_str(0, 1);`
187	`mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);`	187	`mdr_cout_str(screenh - 1, 1, fn, SCHEME_STBAR1, screenw);`
188	`}`	188	`}`
189		189
190	`/* eol type */`	190	`/* eol type */`
191	`{`	191	`{`
192	`const char *eoltype = "CRLF";`	192	`const char *eoltype = "CRLF";`
193	`if (db->lfonly) eoltype = "LF";`	193	`if (db->lfonly) eoltype = "LF";`
194	`mdr_cout_str(screenh - 1, helpcol - 5, eoltype, SCHEME_STBAR1, 5);`	194	`mdr_cout_str(screenh - 1, helpcol - 6, eoltype, SCHEME_STBAR1, 5);`
195	`}`	195	`}`
196		196
197	`mdr_cout_str(screenh - 1, helpcol, " F1=", SCHEME_STBAR2, 40);`	-
198	`mdr_cout_str(screenh - 1, helpcol + 4, s, SCHEME_STBAR2, 40);`	197	`mdr_cout_str(screenh - 1, helpcol, s, SCHEME_STBAR2, 40);`
199	`}`	198	`}`
200		199
201		200
202	`static void ui_msg(const char msg1, const char msg2, unsigned char attr) {`	201	`static void ui_msg(const char msg1, const char msg2, unsigned char attr) {`
203	`unsigned short x, y, msglen, i;`	202	`unsigned short x, y, msglen, i;`
204	`unsigned char msg2flag = 0;`	203	`unsigned char msg2flag = 0;`
205		204
206	`msglen = strlen(msg1);`	205	`msglen = strlen(msg1);`
207	`if (msg2) {`	206	`if (msg2) {`
208	`msg2flag = 1;`	207	`msg2flag = 1;`
209	`i = strlen(msg2);`	208	`i = strlen(msg2);`
210	`if (i > msglen) msglen = i;`	209	`if (i > msglen) msglen = i;`
211	`}`	210	`}`
212		211
213	`y = (screenh - 6) >> 1;`	212	`y = (screenh - 6) >> 1;`
214	`x = (screenw - msglen - 4) >> 1;`	213	`x = (screenw - msglen - 4) >> 1;`
215	`for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`	214	`for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`
216	`x++;`	215	`x++;`
217	`mdr_cout_str(y+1, x, msg1, attr, msglen);`	216	`mdr_cout_str(y+1, x, msg1, attr, msglen);`
218	`if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);`	217	`if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);`
219		218
220	`if (uidirty.from > y) uidirty.from = y;`	219	`if (uidirty.from > y) uidirty.from = y;`
221	`if (uidirty.to < y+4) uidirty.to = y+4;`	220	`if (uidirty.to < y+4) uidirty.to = y+4;`
222	`}`	221	`}`
223		222
224		223
225	`static void ui_help(void) {`	224	`static void ui_help(void) {`
226	`#define MAXLINLEN 35`	225	`#define MAXLINLEN 35`
227	`unsigned short i, offset;`	226	`unsigned short i, offset;`
228	`offset = (screenw - MAXLINLEN + 2) >> 1;`	227	`offset = (screenw - MAXLINLEN + 2) >> 1;`
-		228
229	`mdr_cout_cursor_hide();`	229	`mdr_cout_cursor_hide();`
230	`for (i = 2; i <= 15; i++) {`	230	`for (i = 2; i < 18; i++) {`
231	`mdr_cout_char_rep(i, offset - 2, ' ', SCHEME_STBAR1, MAXLINLEN + 2);`	231	`mdr_cout_char_rep(i, offset - 2, ' ', SCHEME_STBAR1, MAXLINLEN + 2);`
232	`}`	232	`}`
233		233
-		234	`for (i = 0; i < 20; i++) {`
234	`mdr_cout_str(3, offset, svarlang_str(0, 0), SCHEME_STBAR1, MAXLINLEN);`	235	`const char *s = svarlang_str(8, i);`
235	`for (i = 0; i <= 4; i++) {`	236	`if (s[0] == 0) break;`
-		237	`if (s[0] == '.') continue;`
236	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), SCHEME_STBAR1, MAXLINLEN);`	238	`mdr_cout_str(3 + i, offset, s, SCHEME_STBAR1, MAXLINLEN);`
237	`}`	239	`}`
238	`mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), SCHEME_STBAR1, MAXLINLEN);`	-
239		-
240	`/* Press any key */`	-
241	`mdr_cout_str(14, offset, svarlang_str(8, 11), SCHEME_STBAR1, MAXLINLEN);`	-
242		240
243	`keyb_getkey();`	241	`keyb_getkey();`
244	`mdr_cout_cursor_show();`	242	`mdr_cout_cursor_show();`
245	`#undef MAXLINLEN`	243	`#undef MAXLINLEN`
246	`}`	244	`}`
247		245
248		246
249	`static void ui_refresh(const struct file *db) {`	247	`static void ui_refresh(const struct file *db) {`
250	`unsigned char x;`	248	`unsigned char x;`
251	`const struct line far *l;`	249	`const struct line far *l;`
252	`unsigned char y = db->cursorposy;`	250	`unsigned char y = db->cursorposy;`
253		251
254	`#ifdef DBG_REFRESH`	252	`#ifdef DBG_REFRESH`
255	`static char m = 'a';`	253	`static char m = 'a';`
256	`m++;`	254	`m++;`
257	`if (m > 'z') m = 'a';`	255	`if (m > 'z') m = 'a';`
258	`#endif`	256	`#endif`
259		257
260	`/* rewind cursor line to first line that needs redrawing */`	258	`/* rewind cursor line to first line that needs redrawing */`
261	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`	259	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`
262		260
263	`/* iterate over lines and redraw whatever needs to be redrawn */`	261	`/* iterate over lines and redraw whatever needs to be redrawn */`
264	`for (; l != NULL; l = l->next, y++) {`	262	`for (; l != NULL; l = l->next, y++) {`
265		263
266	`/* skip lines that do not need to be refreshed */`	264	`/* skip lines that do not need to be refreshed */`
267	`if (y < uidirty.from) continue;`	265	`if (y < uidirty.from) continue;`
268	`if (y > uidirty.to) break;`	266	`if (y > uidirty.to) break;`
269		267
270	`x = 0;`	268	`x = 0;`
271	`if (db->xoffset < l->len) {`	269	`if (db->xoffset < l->len) {`
272	`unsigned char i, limit;`	270	`unsigned char i, limit;`
273	`if (l->len - db->xoffset < screenw) {`	271	`if (l->len - db->xoffset < screenw) {`
274	`limit = l->len;`	272	`limit = l->len;`
275	`} else {`	273	`} else {`
276	`limit = db->xoffset + screenw - 1;`	274	`limit = db->xoffset + screenw - 1;`
277	`}`	275	`}`
278	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);`	276	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], SCHEME_TEXT);`
279	`}`	277	`}`
280		278
281	`/* write empty spaces until end of line */`	279	`/* write empty spaces until end of line */`
282	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);`	280	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', SCHEME_TEXT, screenw - 1 - x);`
283		281
284	`#ifdef DBG_REFRESH`	282	`#ifdef DBG_REFRESH`
285	`mdr_cout_char(y, 0, m, SCHEME_STBAR1);`	283	`mdr_cout_char(y, 0, m, SCHEME_STBAR1);`
286	`#endif`	284	`#endif`
287		285
288	`if (y == screenh - 2) break;`	286	`if (y == screenh - 2) break;`
289	`}`	287	`}`
290		288
291	`/* fill all lines below if empty (and they need to be redrawn) */`	289	`/* fill all lines below if empty (and they need to be redrawn) */`
292	`if (l == NULL) {`	290	`if (l == NULL) {`
293	`while ((y < screenh - 1) && (y < uidirty.to)) {`	291	`while ((y < screenh - 1) && (y < uidirty.to)) {`
294	`mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);`	292	`mdr_cout_char_rep(y++, 0, ' ', SCHEME_TEXT, screenw - 1);`
295	`}`	293	`}`
296	`}`	294	`}`
297		295
298	`/* "file changed" flag */`	296	`/* "file changed" flag */`
299	`{`	297	`{`
300	`char flg = ' ';`	298	`char flg = ' ';`
301	`if (db->modflag) flg = '*';`	299	`if (db->modflag) flg = '*';`
302	`mdr_cout_char(screenh - 1, 0, flg, SCHEME_STBAR1);`	300	`mdr_cout_char(screenh - 1, 0, flg, SCHEME_STBAR1);`
303	`}`	301	`}`
304		302
305	`/* scroll bar */`	303	`/* scroll bar */`
306	`for (y = 0; y < (screenh - 1); y++) {`	304	`for (y = 0; y < (screenh - 1); y++) {`
307	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);`	305	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, SCHEME_SCROLL);`
308	`}`	306	`}`
309		307
310	`/* scroll cursor */`	308	`/* scroll cursor */`
311	`if (db->totlines >= screenh) {`	309	`if (db->totlines >= screenh) {`
312	`unsigned short topline = db->curline - db->cursorposy;`	310	`unsigned short topline = db->curline - db->cursorposy;`
313	`unsigned short col;`	311	`unsigned short col;`
314	`unsigned short totlines = db->totlines - screenh + 1;`	312	`unsigned short totlines = db->totlines - screenh + 1;`
315	`if (db->totlines - screenh > screenh) {`	313	`if (db->totlines - screenh > screenh) {`
316	`col = topline / (totlines / (screenh - 1));`	314	`col = topline / (totlines / (screenh - 1));`
317	`} else {`	315	`} else {`
318	`col = topline * (screenh - 1) / totlines;`	316	`col = topline * (screenh - 1) / totlines;`
319	`}`	317	`}`
320	`if (col >= screenh - 1) col = screenh - 2;`	318	`if (col >= screenh - 1) col = screenh - 2;`
321	`mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);`	319	`mdr_cout_char(col, screenw - 1, ' ', SCHEME_SCROLL);`
322	`}`	320	`}`
323	`}`	321	`}`
324		322
325		323
326	`static void check_cursor_not_after_eol(struct file *db) {`	324	`static void check_cursor_not_after_eol(struct file *db) {`
327	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	325	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
328		326
329	`if (db->cursor->len < db->xoffset) {`	327	`if (db->cursor->len < db->xoffset) {`
330	`db->cursorposx = 0;`	328	`db->cursorposx = 0;`
331	`db->xoffset = db->cursor->len;`	329	`db->xoffset = db->cursor->len;`
332	`uidirty.from = 0;`	330	`uidirty.from = 0;`
333	`uidirty.to = 0xff;`	331	`uidirty.to = 0xff;`
334	`} else {`	332	`} else {`
335	`db->cursorposx = db->cursor->len - db->xoffset;`	333	`db->cursorposx = db->cursor->len - db->xoffset;`
336	`}`	334	`}`
337	`}`	335	`}`
338		336
339		337
340	`static void cursor_up(struct file *db) {`	338	`static void cursor_up(struct file *db) {`
341	`if (db->cursor->prev != NULL) {`	339	`if (db->cursor->prev != NULL) {`
342	`db->curline -= 1;`	340	`db->curline -= 1;`
343	`db->cursor = db->cursor->prev;`	341	`db->cursor = db->cursor->prev;`
344	`if (db->cursorposy == 0) {`	342	`if (db->cursorposy == 0) {`
345	`uidirty.from = 0;`	343	`uidirty.from = 0;`
346	`uidirty.to = 0xff;`	344	`uidirty.to = 0xff;`
347	`} else {`	345	`} else {`
348	`db->cursorposy -= 1;`	346	`db->cursorposy -= 1;`
349	`}`	347	`}`
350	`}`	348	`}`
351	`}`	349	`}`
352		350
353		351
354	`static void cursor_eol(struct file *db) {`	352	`static void cursor_eol(struct file *db) {`
355	`/* adjust xoffset to make sure eol is visible on screen */`	353	`/* adjust xoffset to make sure eol is visible on screen */`
356	`if (db->xoffset > db->cursor->len) {`	354	`if (db->xoffset > db->cursor->len) {`
357	`db->xoffset = db->cursor->len - 1;`	355	`db->xoffset = db->cursor->len - 1;`
358	`uidirty.from = 0;`	356	`uidirty.from = 0;`
359	`uidirty.to = 0xff;`	357	`uidirty.to = 0xff;`
360	`}`	358	`}`
361		359
362	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	360	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
363	`db->xoffset = db->cursor->len - screenw + 2;`	361	`db->xoffset = db->cursor->len - screenw + 2;`
364	`uidirty.from = 0;`	362	`uidirty.from = 0;`
365	`uidirty.to = 0xff;`	363	`uidirty.to = 0xff;`
366	`}`	364	`}`
367	`db->cursorposx = db->cursor->len - db->xoffset;`	365	`db->cursorposx = db->cursor->len - db->xoffset;`
368	`}`	366	`}`
369		367
370		368
371	`static void cursor_down(struct file *db) {`	369	`static void cursor_down(struct file *db) {`
372	`if (db->cursor->next != NULL) {`	370	`if (db->cursor->next != NULL) {`
373	`db->curline += 1;`	371	`db->curline += 1;`
374	`db->cursor = db->cursor->next;`	372	`db->cursor = db->cursor->next;`
375	`if (db->cursorposy < screenh - 2) {`	373	`if (db->cursorposy < screenh - 2) {`
376	`db->cursorposy += 1;`	374	`db->cursorposy += 1;`
377	`} else {`	375	`} else {`
378	`uidirty.from = 0;`	376	`uidirty.from = 0;`
379	`uidirty.to = 0xff;`	377	`uidirty.to = 0xff;`
380	`}`	378	`}`
381	`}`	379	`}`
382	`}`	380	`}`
383		381
384		382
385	`static void cursor_left(struct file *db) {`	383	`static void cursor_left(struct file *db) {`
386	`if (db->cursorposx > 0) {`	384	`if (db->cursorposx > 0) {`
387	`db->cursorposx -= 1;`	385	`db->cursorposx -= 1;`
388	`} else if (db->xoffset > 0) {`	386	`} else if (db->xoffset > 0) {`
389	`db->xoffset -= 1;`	387	`db->xoffset -= 1;`
390	`uidirty.from = 0;`	388	`uidirty.from = 0;`
391	`uidirty.to = 0xff;`	389	`uidirty.to = 0xff;`
392	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	390	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
393	`cursor_up(db);`	391	`cursor_up(db);`
394	`cursor_eol(db);`	392	`cursor_eol(db);`
395	`}`	393	`}`
396	`}`	394	`}`
397		395
398		396
399	`static void cursor_home(struct file *db) {`	397	`static void cursor_home(struct file *db) {`
400	`db->cursorposx = 0;`	398	`db->cursorposx = 0;`
401	`if (db->xoffset != 0) {`	399	`if (db->xoffset != 0) {`
402	`db->xoffset = 0;`	400	`db->xoffset = 0;`
403	`uidirty.from = 0;`	401	`uidirty.from = 0;`
404	`uidirty.to = 0xff;`	402	`uidirty.to = 0xff;`
405	`}`	403	`}`
406	`}`	404	`}`
407		405
408		406
409	`static void cursor_right(struct file *db) {`	407	`static void cursor_right(struct file *db) {`
410	`if (db->cursor->len > db->xoffset + db->cursorposx) {`	408	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
411	`if (db->cursorposx < screenw - 2) {`	409	`if (db->cursorposx < screenw - 2) {`
412	`db->cursorposx += 1;`	410	`db->cursorposx += 1;`
413	`} else {`	411	`} else {`
414	`db->xoffset += 1;`	412	`db->xoffset += 1;`
415	`uidirty.from = 0;`	413	`uidirty.from = 0;`
416	`uidirty.to = 0xff;`	414	`uidirty.to = 0xff;`
417	`}`	415	`}`
418	`} else {`	416	`} else {`
419	`cursor_down(db);`	417	`cursor_down(db);`
420	`cursor_home(db);`	418	`cursor_home(db);`
421	`}`	419	`}`
422	`}`	420	`}`
423		421
424		422
425	`static void del(struct file *db) {`	423	`static void del(struct file *db) {`
426	`if (db->cursorposx + db->xoffset < db->cursor->len) {`	424	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
427	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`	425	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`
428	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	426	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
429	`uidirty.from = db->cursorposy;`	427	`uidirty.from = db->cursorposy;`
430	`uidirty.to = db->cursorposy;`	428	`uidirty.to = db->cursorposy;`
431	`db->modflag = 1;`	429	`db->modflag = 1;`
432	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	430	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`
433	`struct line far *nextline = db->cursor->next;`	431	`struct line far *nextline = db->cursor->next;`
434	`if (db->cursor->next->len > 0) {`	432	`if (db->cursor->next->len > 0) {`
435	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	433	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
436	`if (newptr != NULL) {`	434	`if (newptr != NULL) {`
437	`db->cursor = newptr;`	435	`db->cursor = newptr;`
438	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	436	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
439	`db->cursor->len += db->cursor->next->len;`	437	`db->cursor->len += db->cursor->next->len;`
440	`}`	438	`}`
441	`}`	439	`}`
442	`db->cursor->next = db->cursor->next->next;`	440	`db->cursor->next = db->cursor->next->next;`
443	`db->cursor->next->prev = db->cursor;`	441	`db->cursor->next->prev = db->cursor;`
444	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	442	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
445	`_ffree(nextline);`	443	`_ffree(nextline);`
446	`uidirty.from = db->cursorposy;`	444	`uidirty.from = db->cursorposy;`
447	`uidirty.to = 0xff;`	445	`uidirty.to = 0xff;`
448	`db->totlines -= 1;`	446	`db->totlines -= 1;`
449	`db->modflag = 1;`	447	`db->modflag = 1;`
450	`}`	448	`}`
451	`}`	449	`}`
452		450
453		451
454	`static void bkspc(struct file *db) {`	452	`static void bkspc(struct file *db) {`
455		453
456	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	454	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
457	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	455	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
458		456
459	`cursor_left(db);`	457	`cursor_left(db);`
460	`del(db);`	458	`del(db);`
461	`}`	459	`}`
462		460
463		461
464	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	462	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
465	`* of argc and argv, saves some 330 bytes of binary size */`	463	`* of argc and argv, saves some 330 bytes of binary size */`
466	`static char *parseargv(void) {`	464	`static char *parseargv(void) {`
467	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	465	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
468	`unsigned char count = 0;`	466	`unsigned char count = 0;`
469	`char *argv[4];`	467	`char *argv[4];`
470		468
471	`while (count < 4) {`	469	`while (count < 4) {`
472	`/* jump to nearest arg */`	470	`/* jump to nearest arg */`
473	`while (*tail == ' ') {`	471	`while (*tail == ' ') {`
474	`*tail = 0;`	472	`*tail = 0;`
475	`tail++;`	473	`tail++;`
476	`}`	474	`}`
477		475
478	`if (*tail == '\r') {`	476	`if (*tail == '\r') {`
479	`*tail = 0;`	477	`*tail = 0;`
480	`break;`	478	`break;`
481	`}`	479	`}`
482		480
483	`argv[count++] = tail;`	481	`argv[count++] = tail;`
484		482
485	`/* jump to next delimiter */`	483	`/* jump to next delimiter */`
486	`while ((tail != ' ') && (tail != '\r')) tail++;`	484	`while ((tail != ' ') && (tail != '\r')) tail++;`
487	`}`	485	`}`
488		486
489	`/* check args now */`	487	`/* check args now */`
490	`if (count == 0) return("");`	488	`if (count == 0) return("");`
491		489
492	`return(argv[0]);`	490	`return(argv[0]);`
493	`}`	491	`}`
494		492
495		493
496	`static struct file loadfile(const char fname) {`	494	`static struct file loadfile(const char fname) {`
497	`char buff[512]; /* read one entire sector at a time (faster) */`	495	`char buff[512]; /* read one entire sector at a time (faster) */`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c – Rev 1334 → 1335