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


/* Sved, the SvarDOS editor
 *
 * Copyright (C) 2023 Mateusz Viste
 *
 * Sved is released under the terms of the MIT license.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */
 
#include <dos.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>   /* _fcalloc() */
 
#include "mdr\bios.h"
#include "mdr\cout.h"
#include "mdr\dos.h"
#include "mdr\keyb.h"
 
#include "svarlang\svarlang.h"
 
 
/*****************************************************************************
 * global variables and definitions                                          *
 *****************************************************************************/
#define COL_TXT        0
#define COL_STATUSBAR1 1
#define COL_STATUSBAR2 2
#define COL_SCROLLBAR  3
#define COL_MSG        4
#define COL_ERR        5
 
/* preload the mono scheme (to be overloaded at runtime if color adapter present) */
static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70, 0x70, 0xf0};
 
static unsigned char screenw, screenh;
 
static struct {
    unsigned char from;
    unsigned char to;
} uidirty = {0, 0xff}; /* make sure to redraw entire UI at first run */
 
#define SCROLL_CURSOR 0xB1
 
struct line {
  struct line far *prev;
  struct line far *next;
  unsigned short len;
  char payload[1];
};
 
struct file {
  int fd;
  struct line far *cursor;
  unsigned short xoffset;
  unsigned char cursorposx;
  unsigned char cursorposy;
  unsigned short totlines;
  unsigned short curline;
  char lfonly;   /* set if line endings are LF (CR/LF otherwise) */
  char modflag;  /* non-zero if file has been modified since last save */
  char fname[1]; /* dynamically sized */
};
 
 
/*****************************************************************************
 * 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);
}
 
 
/* append a nul-terminated string to line at cursor position */
static int line_append(struct file *f, const char far *buf, unsigned short len) {
  struct line far *n;
  if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */
  n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);
  if (n == NULL) return(-1);
  f->cursor = n;
  _fmemcpy(f->cursor->payload + f->cursor->len, buf, len);
  f->cursor->len += len;
 
  /* rewire the linked list */
  if (f->cursor->next) f->cursor->next->prev = f->cursor;
  if (f->cursor->prev) f->cursor->prev->next = f->cursor;
 
  return(0);
}
 
 
static void db_rewind(struct file *db) {
  if (db->cursor == NULL) return;
  while (db->cursor->prev) db->cursor = db->cursor->prev;
  db->curline = 0;
}
 
 
static void load_colorscheme(void) {
  scheme[COL_TXT] = 0x17;
  scheme[COL_STATUSBAR1] = 0x70;
  scheme[COL_STATUSBAR2] = 0x78;
  scheme[COL_SCROLLBAR] = 0x70;
  scheme[COL_MSG] = 0xf0;
  scheme[COL_ERR] = 0x4f;
}
 
 
static void ui_basic(const struct file *db) {
  const char *s = svarlang_strid(0); /* HELP */
  unsigned char helpcol = screenw - (strlen(s) + 4);
 
  /* fill status bar with background (without modflag as it is refreshed by ui_refresh) */
  mdr_cout_char_rep(screenh - 1, 1, ' ', scheme[COL_STATUSBAR1], screenw - 1);
 
  /* filename */
  {
    const char *fn = db->fname;
    if (*fn == 0) fn = svarlang_str(0, 1);
    mdr_cout_str(screenh - 1, 1, fn, scheme[COL_STATUSBAR1], screenw);
  }
 
  /* eol type */
  {
    const char *eoltype = "CRLF";
    if (db->lfonly) eoltype = "LF";
    mdr_cout_str(screenh - 1, helpcol - 5, eoltype, scheme[COL_STATUSBAR1], 5);
  }
 
  mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);
  mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);
}
 
 
static void ui_msg(const char *msg1, const char *msg2, unsigned char attr) {
  unsigned short x, y, msglen, i;
  unsigned char msg2flag = 0;
 
  msglen = strlen(msg1);
  if (msg2) {
    msg2flag = 1;
    i = strlen(msg2);
    if (i > msglen) msglen = i;
  }
 
  y = (screenh - 6) >> 1;
  x = (screenw - msglen - 4) >> 1;
  for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
  x++;
  mdr_cout_str(y+1, x, msg1, attr, msglen);
  if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);
 
  if (uidirty.from > y) uidirty.from = y;
  if (uidirty.to < y+4) uidirty.to = y+4;
}
 
 
static void ui_help(void) {
#define MAXLINLEN 35
  unsigned short i, offset;
  offset = (screenw - MAXLINLEN + 2) >> 1;
  mdr_cout_cursor_hide();
  for (i = 2; i <= 15; i++) {
    mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);
  }
 
  mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);
  for (i = 0; i <= 4; i++) {
    mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);
  }
  mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);
 
  /* Press any key */
  mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);
 
  keyb_getkey();
  mdr_cout_cursor_show();
#undef MAXLINLEN
}
 
 
static void ui_refresh(const struct file *db) {
  unsigned char x;
  const struct line far *l;
  unsigned char y = db->cursorposy;
 
#ifdef DBG_REFRESH
  static char m = 'a';
  m++;
  if (m > 'z') m = 'a';
#endif
 
  /* rewind cursor line to first line that needs redrawing */
  for (l = db->cursor; y > uidirty.from; y--) l = l->prev;
 
  /* iterate over lines and redraw whatever needs to be redrawn */
  for (; l != NULL; l = l->next, y++) {
 
    /* skip lines that do not need to be refreshed */
    if (y < uidirty.from) continue;
    if (y > uidirty.to) break;
 
    x = 0;
    if (db->xoffset < l->len) {
      unsigned char i, limit;
      if (l->len - db->xoffset < screenw) {
        limit = l->len;
      } else {
        limit = db->xoffset + screenw - 1;
      }
      for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);
    }
 
    /* write empty spaces until end of line */
    if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);
 
#ifdef DBG_REFRESH
    mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);
#endif
 
    if (y == screenh - 2) break;
  }
 
  /* fill all lines below if empty (and they need to be redrawn) */
  if (l == NULL) {
    while ((y < screenh - 1) && (y < uidirty.to)) {
      mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);
    }
  }
 
  /* "file changed" flag */
  {
    char flg = ' ';
    if (db->modflag) flg = '*';
    mdr_cout_char(screenh - 1, 0, flg, scheme[COL_STATUSBAR1]);
  }
 
  /* scroll bar */
  for (y = 0; y < (screenh - 1); y++) {
    mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);
  }
 
  /* scroll cursor */
  if (db->totlines >= screenh) {
    unsigned short topline = db->curline - db->cursorposy;
    unsigned short col;
    unsigned short totlines = db->totlines - screenh + 1;
    if (db->totlines - screenh > screenh) {
      col = topline / (totlines / (screenh - 1));
    } else {
      col = topline * (screenh - 1) / totlines;
    }
    if (col >= screenh - 1) col = screenh - 2;
    mdr_cout_char(col, screenw - 1, ' ', scheme[COL_SCROLLBAR]);
  }
}
 
 
static void check_cursor_not_after_eol(struct file *db) {
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
 
  if (db->cursor->len < db->xoffset) {
    db->cursorposx = 0;
    db->xoffset = db->cursor->len;
    uidirty.from = 0;
    uidirty.to = 0xff;
  } else {
    db->cursorposx = db->cursor->len - db->xoffset;
  }
}
 
 
static void cursor_up(struct file *db) {
  if (db->cursor->prev != NULL) {
    db->curline -= 1;
    db->cursor = db->cursor->prev;
    if (db->cursorposy == 0) {
      uidirty.from = 0;
      uidirty.to = 0xff;
    } else {
      db->cursorposy -= 1;
    }
  }
}
 
 
static void cursor_eol(struct file *db) {
  /* adjust xoffset to make sure eol is visible on screen */
  if (db->xoffset > db->cursor->len) {
    db->xoffset = db->cursor->len - 1;
    uidirty.from = 0;
    uidirty.to = 0xff;
  }
 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
    db->xoffset = db->cursor->len - screenw + 2;
    uidirty.from = 0;
    uidirty.to = 0xff;
  }
  db->cursorposx = db->cursor->len - db->xoffset;
}
 
 
static void cursor_down(struct file *db) {
  if (db->cursor->next != NULL) {
    db->curline += 1;
    db->cursor = db->cursor->next;
    if (db->cursorposy < screenh - 2) {
      db->cursorposy += 1;
    } else {
      uidirty.from = 0;
      uidirty.to = 0xff;
    }
  }
}
 
 
static void cursor_left(struct file *db) {
  if (db->cursorposx > 0) {
    db->cursorposx -= 1;
  } else if (db->xoffset > 0) {
    db->xoffset -= 1;
    uidirty.from = 0;
    uidirty.to = 0xff;
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
    cursor_up(db);
    cursor_eol(db);
  }
}
 
 
static void cursor_home(struct file *db) {
  db->cursorposx = 0;
  if (db->xoffset != 0) {
    db->xoffset = 0;
    uidirty.from = 0;
    uidirty.to = 0xff;
  }
}
 
 
static void cursor_right(struct file *db) {
  if (db->cursor->len > db->xoffset + db->cursorposx) {
    if (db->cursorposx < screenw - 2) {
      db->cursorposx += 1;
    } else {
      db->xoffset += 1;
      uidirty.from = 0;
      uidirty.to = 0xff;
    }
  } else {
    cursor_down(db);
    cursor_home(db);
  }
}
 
 
static void del(struct file *db) {
  if (db->cursorposx + db->xoffset < db->cursor->len) {
    _fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);
    db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */
    uidirty.from = db->cursorposy;
    uidirty.to = db->cursorposy;
    db->modflag = 1;
  } else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */
    struct line far *nextline = db->cursor->next;
    if (db->cursor->next->len > 0) {
      void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);
      if (newptr != NULL) {
        db->cursor = newptr;
        _fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);
        db->cursor->len += db->cursor->next->len;
      }
    }
    db->cursor->next = db->cursor->next->next;
    db->cursor->next->prev = db->cursor;
    if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */
    _ffree(nextline);
    uidirty.from = db->cursorposy;
    uidirty.to = 0xff;
    db->totlines -= 1;
    db->modflag = 1;
  }
}
 
 
static void bkspc(struct file *db) {
 
  /* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */
  if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;
 
  cursor_left(db);
  del(db);
}
 
 
/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need
 * of argc and argv, saves some 330 bytes of binary size */
static char *parseargv(void) {
  char *tail = (void *)0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */
  unsigned char count = 0;
  char *argv[4];
 
  while (count < 4) {
    /* jump to nearest arg */
    while (*tail == ' ') {
      *tail = 0;
      tail++;
    }
 
    if (*tail == '\r') {
      *tail = 0;
      break;
    }
 
    argv[count++] = tail;
 
    /* jump to next delimiter */
    while ((*tail != ' ') && (*tail != '\r')) tail++;
  }
 
  /* check args now */
  if (count == 0) return("");
 
  return(argv[0]);
}
 
 
static struct file *loadfile(const char *fname) {
  char buff[512]; /* read one entire sector at a time (faster) */
  char *buffptr;
  unsigned int len, llen;
  int fd;
  unsigned char eolfound;
  struct file *db;
 
  len = strlen(fname) + 1;
  db = calloc(1, sizeof(struct file) + len);
  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) {
  int fd;
  const struct line far *l;
  unsigned bytes;
  unsigned char eollen;
  unsigned char eolbuf[2];
 
  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) {
      _dos_write(fd, l->payload, l->len, &bytes);
    } else if (l->next == NULL) {
      break;
    }
    _dos_write(fd, eolbuf, eollen, &bytes);
    l = l->next;
  }
 
  _dos_close(fd);
 
  return(0);
}
 
 
static void insert_in_line(struct file *db, const char *databuf, unsigned short len) {
  struct line far *n;
  n = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + len);
  if (n != NULL) {
    unsigned short off = db->xoffset + db->cursorposx;
    db->modflag = 1;
    if (n->prev) n->prev->next = n;
    if (n->next) n->next->prev = n;
    db->cursor = n;
    _fmemmove(db->cursor->payload + off + len, db->cursor->payload + off, db->cursor->len - off + 1);
    db->cursor->len += len;
    uidirty.from = db->cursorposy;
    uidirty.to = db->cursorposy;
    while (len--) {
      db->cursor->payload[off++] = *databuf;
      databuf++;
      cursor_right(db);
    }
  }
}
 
 
int main(void) {
  const char *fname;
  struct file *db;
 
  {
    char nlspath[128], lang[8];
    svarlang_autoload_pathlist("sved", mdr_dos_getenv(nlspath, "NLSPATH", sizeof(nlspath)), mdr_dos_getenv(lang, "LANG", sizeof(lang)));
  }
 
  fname = parseargv();
 
  if (fname == NULL) {
    mdr_coutraw_puts(svarlang_str(1,0)); /* usage: sved file.txt */
    return(0);
  }
 
  /* load file */
  db = loadfile(fname);
  if (db == NULL) return(1);
 
  if (mdr_cout_init(&screenw, &screenh)) load_colorscheme();
  ui_basic(db);
 
  for (;;) {
    int k;
 
    check_cursor_not_after_eol(db);
    mdr_cout_locate(db->cursorposy, db->cursorposx);
 
    if (uidirty.from != 0xff) {
      ui_refresh(db);
      uidirty.from = 0xff;
    }
#ifdef DBG_LINENUM
      {
        char ddd[10];
        db->curline += 1;
        ddd[0] = '0' + db->curline / 100;
        ddd[1] = '0' + (db->curline % 100) / 10;
        ddd[2] = '0' + (db->curline % 10);
        db->curline -= 1;
        ddd[3] = '/';
        ddd[4] = '0' + db->totlines / 100;
        ddd[5] = '0' + (db->totlines % 100) / 10;
        ddd[6] = '0' + (db->totlines % 10);
        ddd[7] = 0;
        mdr_cout_str(screenh - 1, 40, ddd, scheme[COL_STATUSBAR1], sizeof(ddd));
      }
#endif
 
    k = keyb_getkey();
 
    if (k == 0x150) { /* down */
      cursor_down(db);
 
    } else if (k == 0x148) { /* up */
      cursor_up(db);
 
    } else if (k == 0x14D) { /* right */
      cursor_right(db);
 
    } else if (k == 0x14B) { /* left */
      cursor_left(db);
 
    } else if (k == 0x149) { /* pgup */
      // TODO
 
    } else if (k == 0x151) { /* pgdown */
      // TODO
 
    } else if (k == 0x147) { /* home */
       cursor_home(db);
 
    } else if (k == 0x14F) { /* end */
       cursor_eol(db);
 
    } else if (k == 0x1B) { /* ESC */
      if (db->modflag == 0) break;
      /* if file has been modified then ask for confirmation */
      ui_msg(svarlang_str(0,4), svarlang_str(0,5), scheme[COL_MSG]);
      if (keyb_getkey() == '\r') break;
 
    } else if (k == 0x0D) { /* ENTER */
      unsigned short off = db->xoffset + db->cursorposx;
      /* add a new line */
      if (line_add(db, db->cursor->payload + off, db->cursor->len - off) == 0) {
        db->modflag = 1;
        db->cursor = db->cursor->prev; /* back to original line */
        db->curline -= 1;
        /* trim the line above */
        db->cursor->len = off;
        /* move cursor to the (new) line below */
        uidirty.from = db->cursorposy;
        uidirty.to = 0xff;
        cursor_down(db);
        cursor_home(db);
      } else {
        /* ERROR: OUT OF MEMORY */
      }
 
    } else if (k == 0x153) {  /* DEL */
      del(db);
 
    } else if (k == 0x008) { /* BKSPC */
      bkspc(db);
 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
      char c = k;
      insert_in_line(db, &c, 1);
 
    } else if (k == 0x009) { /* TAB */
      const char *tab = "        ";
      insert_in_line(db, tab, 8);
 
    } else if (k == 0x13b) { /* F1 */
      ui_help();
      uidirty.from = 0;
      uidirty.to = 0xff;
 
    } else if (k == 0x13f) { /* F5 */
      if (savefile(db) == 0) {
        db->modflag = 0;
        ui_msg(svarlang_str(0, 2), NULL, scheme[COL_MSG]);
        mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
      } else {
        ui_msg(svarlang_str(0, 3), NULL, scheme[COL_ERR]);
        mdr_bios_tickswait(36); /* 2s */
      }
 
    } else if (k == 0x144) { /* F10 */
      db->modflag = 1;
      db->lfonly ^= 1;
      ui_basic(db);
 
    } else if (k == 0x174) { /* CTRL+ArrRight - jump to next word */
      /* if currently cursor is on a non-space, then fast-forward to nearest space or EOL */
      for (;;) {
        if (db->xoffset + db->cursorposx == db->cursor->len) break;
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') break;
        cursor_right(db);
      }
      /* now skip to next non-space or end of file */
      for (;;) {
        cursor_right(db);
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
        if ((db->cursor->next == NULL) && (db->cursorposx + db->xoffset == db->cursor->len)) break;
      }
 
    } else if (k == 0x173) { /* CTRL+ArrLeft - jump to prev word */
      cursor_left(db);
      /* if currently cursor is on a space, then fast-forward to nearest non-space or start of line */
      for (;;) {
        if ((db->xoffset == 0) && (db->cursorposx == 0)) break;
        if (db->cursor->payload[db->xoffset + db->cursorposx] != ' ') break;
        cursor_left(db);
      }
      /* now skip to next space or start of file */
      for (;;) {
        cursor_left(db);
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
          cursor_right(db);
          break;
        }
        if ((db->cursorposx == 0) && (db->xoffset == 0)) break;
      }
 
    } else { /* UNHANDLED KEY - TODO IGNORE THIS IN PRODUCTION RELEASE */
      char buff[4];
      const char *HEX = "0123456789ABCDEF";
      buff[0] = HEX[(k >> 8) & 15];
      buff[1] = HEX[(k >> 4) & 15];
      buff[2] = HEX[k & 15];
      mdr_cout_str(screenh - 1, 0, "UNHANDLED KEY: 0x", scheme[COL_STATUSBAR1], 17);
      mdr_cout_str(screenh - 1, 17, buff, scheme[COL_STATUSBAR1], 3);
      keyb_getkey();
      break;
    }
  }
 
  mdr_cout_close();
 
  /* no need to free memory, DOS will do it for me */
 
  return(0);
}
 

Rev 1330	Rev 1331
1	`/* Sved, the SvarDOS editor`	1	`/* Sved, the SvarDOS editor`
2	`*`	2	`*`
3	`* Copyright (C) 2023 Mateusz Viste`	3	`* Copyright (C) 2023 Mateusz Viste`
4	`*`	4	`*`
5	`* Sved is released under the terms of the MIT license.`	5	`* Sved is released under the terms of the MIT license.`
6	`*`	6	`*`
7	`* Permission is hereby granted, free of charge, to any person obtaining a copy`	7	`* Permission is hereby granted, free of charge, to any person obtaining a copy`
8	`* of this software and associated documentation files (the "Software"), to`	8	`* of this software and associated documentation files (the "Software"), to`
9	`* deal in the Software without restriction, including without limitation the`	9	`* deal in the Software without restriction, including without limitation the`
10	`* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or`	10	`* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or`
11	`* sell copies of the Software, and to permit persons to whom the Software is`	11	`* sell copies of the Software, and to permit persons to whom the Software is`
12	`* furnished to do so, subject to the following conditions:`	12	`* furnished to do so, subject to the following conditions:`
13	`*`	13	`*`
14	`* The above copyright notice and this permission notice shall be included in`	14	`* The above copyright notice and this permission notice shall be included in`
15	`* all copies or substantial portions of the Software.`	15	`* all copies or substantial portions of the Software.`
16	`*`	16	`*`
17	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`	17	`* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR`
18	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`	18	`* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,`
19	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`	19	`* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE`
20	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`	20	`* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER`
21	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`	21	`* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING`
22	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS`	22	`* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS`
23	`* IN THE SOFTWARE.`	23	`* IN THE SOFTWARE.`
24	`*/`	24	`*/`
25		25
26	`#include <dos.h>`	26	`#include <dos.h>`
27	`#include <fcntl.h>`	27	`#include <fcntl.h>`
28	`#include <stdlib.h>`	28	`#include <stdlib.h>`
29	`#include <string.h>`	29	`#include <string.h>`
30	`#include <malloc.h> /* _fcalloc() */`	30	`#include <malloc.h> /* _fcalloc() */`
31		31
32	`#include "mdr\bios.h"`	32	`#include "mdr\bios.h"`
33	`#include "mdr\cout.h"`	33	`#include "mdr\cout.h"`
34	`#include "mdr\dos.h"`	34	`#include "mdr\dos.h"`
35	`#include "mdr\keyb.h"`	35	`#include "mdr\keyb.h"`
36		36
37	`#include "svarlang\svarlang.h"`	37	`#include "svarlang\svarlang.h"`
38		38
39		39
40	`/*****************************************************************************`	40	`/*****************************************************************************`
41	`* global variables and definitions *`	41	`* global variables and definitions *`
42	`*****************************************************************************/`	42	`*****************************************************************************/`
43	`#define COL_TXT 0`	43	`#define COL_TXT 0`
44	`#define COL_STATUSBAR1 1`	44	`#define COL_STATUSBAR1 1`
45	`#define COL_STATUSBAR2 2`	45	`#define COL_STATUSBAR2 2`
46	`#define COL_SCROLLBAR 3`	46	`#define COL_SCROLLBAR 3`
47	`#define COL_MSG 4`	47	`#define COL_MSG 4`
48	`#define COL_ERR 5`	48	`#define COL_ERR 5`
49		49
50	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`	50	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`
51	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70, 0x70, 0xf0};`	51	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70, 0x70, 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[1]; /* dynamically sized */`	79	`char fname[1]; /* dynamically sized */`
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	`/* append a nul-terminated string to line at cursor position */`	112	`/* append a nul-terminated string to line at cursor position */`
113	`static int line_append(struct file f, const char far buf, unsigned short len) {`	113	`static int line_append(struct file f, const char far buf, unsigned short len) {`
114	`struct line far *n;`	114	`struct line far *n;`
115	`if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */`	115	`if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */`
116	`n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);`	116	`n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);`
117	`if (n == NULL) return(-1);`	117	`if (n == NULL) return(-1);`
118	`f->cursor = n;`	118	`f->cursor = n;`
119	`_fmemcpy(f->cursor->payload + f->cursor->len, buf, len);`	119	`_fmemcpy(f->cursor->payload + f->cursor->len, buf, len);`
120	`f->cursor->len += len;`	120	`f->cursor->len += len;`
121		121
122	`/* rewire the linked list */`	122	`/* rewire the linked list */`
123	`if (f->cursor->next) f->cursor->next->prev = f->cursor;`	123	`if (f->cursor->next) f->cursor->next->prev = f->cursor;`
124	`if (f->cursor->prev) f->cursor->prev->next = f->cursor;`	124	`if (f->cursor->prev) f->cursor->prev->next = f->cursor;`
125		125
126	`return(0);`	126	`return(0);`
127	`}`	127	`}`
128		128
129		129
130	`static void db_rewind(struct file *db) {`	130	`static void db_rewind(struct file *db) {`
131	`if (db->cursor == NULL) return;`	131	`if (db->cursor == NULL) return;`
132	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	132	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
133	`db->curline = 0;`	133	`db->curline = 0;`
134	`}`	134	`}`
135		135
136		136
137	`static void load_colorscheme(void) {`	137	`static void load_colorscheme(void) {`
138	`scheme[COL_TXT] = 0x17;`	138	`scheme[COL_TXT] = 0x17;`
139	`scheme[COL_STATUSBAR1] = 0x70;`	139	`scheme[COL_STATUSBAR1] = 0x70;`
140	`scheme[COL_STATUSBAR2] = 0x78;`	140	`scheme[COL_STATUSBAR2] = 0x78;`
141	`scheme[COL_SCROLLBAR] = 0x70;`	141	`scheme[COL_SCROLLBAR] = 0x70;`
142	`scheme[COL_MSG] = 0xf0;`	142	`scheme[COL_MSG] = 0xf0;`
143	`scheme[COL_ERR] = 0x4f;`	143	`scheme[COL_ERR] = 0x4f;`
144	`}`	144	`}`
145		145
146		146
147	`static void ui_basic(const struct file *db) {`	147	`static void ui_basic(const struct file *db) {`
148	`const char s = svarlang_strid(0); / HELP */`	148	`const char s = svarlang_strid(0); / HELP */`
149	`unsigned char helpcol = screenw - (strlen(s) + 4);`	149	`unsigned char helpcol = screenw - (strlen(s) + 4);`
150		150
151	`/* fill status bar with background (without modflag as it is refreshed by ui_refresh) */`	151	`/* fill status bar with background (without modflag as it is refreshed by ui_refresh) */`
152	`mdr_cout_char_rep(screenh - 1, 1, ' ', scheme[COL_STATUSBAR1], screenw - 1);`	152	`mdr_cout_char_rep(screenh - 1, 1, ' ', scheme[COL_STATUSBAR1], screenw - 1);`
153		153
154	`/* filename */`	154	`/* filename */`
155	`{`	155	`{`
156	`const char *fn = db->fname;`	156	`const char *fn = db->fname;`
157	`if (*fn == 0) fn = svarlang_str(0, 1);`	157	`if (*fn == 0) fn = svarlang_str(0, 1);`
158	`mdr_cout_str(screenh - 1, 1, fn, scheme[COL_STATUSBAR1], screenw);`	158	`mdr_cout_str(screenh - 1, 1, fn, scheme[COL_STATUSBAR1], screenw);`
159	`}`	159	`}`
160		160
161	`/* eol type */`	161	`/* eol type */`
162	`{`	162	`{`
163	`const char *eoltype = "CRLF";`	163	`const char *eoltype = "CRLF";`
164	`if (db->lfonly) eoltype = "LF";`	164	`if (db->lfonly) eoltype = "LF";`
165	`mdr_cout_str(screenh - 1, helpcol - 5, eoltype, scheme[COL_STATUSBAR1], 5);`	165	`mdr_cout_str(screenh - 1, helpcol - 5, eoltype, scheme[COL_STATUSBAR1], 5);`
166	`}`	166	`}`
167		167
168	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	168	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
169	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`	169	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`
170	`}`	170	`}`
171		171
172		172
173	`static void ui_msg(const char *msg, unsigned char attr) {`	173	`static void ui_msg(const char msg1, const char msg2, unsigned char attr) {`
174	`unsigned short x, y, msglen, i;`	174	`unsigned short x, y, msglen, i;`
-		175	`unsigned char msg2flag = 0;`
-		176
175	`msglen = strlen(msg);`	177	`msglen = strlen(msg1);`
-		178	`if (msg2) {`
-		179	`msg2flag = 1;`
-		180	`i = strlen(msg2);`
-		181	`if (i > msglen) msglen = i;`
-		182	`}`
-		183
176	`y = (screenh - 4) >> 1;`	184	`y = (screenh - 6) >> 1;`
177	`x = (screenw - msglen - 4) >> 1;`	185	`x = (screenw - msglen - 4) >> 1;`
178	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`	186	`for (i = y+2+msg2flag; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`
-		187	`x++;`
179	`mdr_cout_str(y+1, x+1, msg, attr, msglen);`	188	`mdr_cout_str(y+1, x, msg1, attr, msglen);`
-		189	`if (msg2) mdr_cout_str(y+2, x, msg2, attr, msglen);`
180		190
181	`if (uidirty.from > y) uidirty.from = y;`	191	`if (uidirty.from > y) uidirty.from = y;`
182	`if (uidirty.to < y+3) uidirty.to = y+3;`	192	`if (uidirty.to < y+4) uidirty.to = y+4;`
183	`}`	193	`}`
184		194
185		195
186	`static void ui_help(void) {`	196	`static void ui_help(void) {`
187	`#define MAXLINLEN 35`	197	`#define MAXLINLEN 35`
188	`unsigned short i, offset;`	198	`unsigned short i, offset;`
189	`offset = (screenw - MAXLINLEN + 2) >> 1;`	199	`offset = (screenw - MAXLINLEN + 2) >> 1;`
190	`mdr_cout_cursor_hide();`	200	`mdr_cout_cursor_hide();`
191	`for (i = 2; i <= 15; i++) {`	201	`for (i = 2; i <= 15; i++) {`
192	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);`	202	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);`
193	`}`	203	`}`
194		204
195	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`	205	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`
196	`for (i = 0; i <= 4; i++) {`	206	`for (i = 0; i <= 4; i++) {`
197	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`	207	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`
198	`}`	208	`}`
199	`mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`	209	`mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`
200		210
201	`/* Press any key */`	211	`/* Press any key */`
202	`mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`	212	`mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`
203		213
204	`keyb_getkey();`	214	`keyb_getkey();`
205	`mdr_cout_cursor_show();`	215	`mdr_cout_cursor_show();`
206	`#undef MAXLINLEN`	216	`#undef MAXLINLEN`
207	`}`	217	`}`
208		218
209		219
210	`static void ui_refresh(const struct file *db) {`	220	`static void ui_refresh(const struct file *db) {`
211	`unsigned char x;`	221	`unsigned char x;`
212	`const struct line far *l;`	222	`const struct line far *l;`
213	`unsigned char y = db->cursorposy;`	223	`unsigned char y = db->cursorposy;`
214		224
215	`#ifdef DBG_REFRESH`	225	`#ifdef DBG_REFRESH`
216	`static char m = 'a';`	226	`static char m = 'a';`
217	`m++;`	227	`m++;`
218	`if (m > 'z') m = 'a';`	228	`if (m > 'z') m = 'a';`
219	`#endif`	229	`#endif`
220		230
221	`/* rewind cursor line to first line that needs redrawing */`	231	`/* rewind cursor line to first line that needs redrawing */`
222	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`	232	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`
223		233
224	`/* iterate over lines and redraw whatever needs to be redrawn */`	234	`/* iterate over lines and redraw whatever needs to be redrawn */`
225	`for (; l != NULL; l = l->next, y++) {`	235	`for (; l != NULL; l = l->next, y++) {`
226		236
227	`/* skip lines that do not need to be refreshed */`	237	`/* skip lines that do not need to be refreshed */`
228	`if (y < uidirty.from) continue;`	238	`if (y < uidirty.from) continue;`
229	`if (y > uidirty.to) break;`	239	`if (y > uidirty.to) break;`
230		240
231	`x = 0;`	241	`x = 0;`
232	`if (db->xoffset < l->len) {`	242	`if (db->xoffset < l->len) {`
233	`unsigned char i, limit;`	243	`unsigned char i, limit;`
234	`if (l->len - db->xoffset < screenw) {`	244	`if (l->len - db->xoffset < screenw) {`
235	`limit = l->len;`	245	`limit = l->len;`
236	`} else {`	246	`} else {`
237	`limit = db->xoffset + screenw - 1;`	247	`limit = db->xoffset + screenw - 1;`
238	`}`	248	`}`
239	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`	249	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`
240	`}`	250	`}`
241		251
242	`/* write empty spaces until end of line */`	252	`/* write empty spaces until end of line */`
243	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`	253	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`
244		254
245	`#ifdef DBG_REFRESH`	255	`#ifdef DBG_REFRESH`
246	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	256	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
247	`#endif`	257	`#endif`
248		258
249	`if (y == screenh - 2) break;`	259	`if (y == screenh - 2) break;`
250	`}`	260	`}`
251		261
252	`/* fill all lines below if empty (and they need to be redrawn) */`	262	`/* fill all lines below if empty (and they need to be redrawn) */`
253	`if (l == NULL) {`	263	`if (l == NULL) {`
254	`while ((y < screenh - 1) && (y < uidirty.to)) {`	264	`while ((y < screenh - 1) && (y < uidirty.to)) {`
255	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`	265	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`
256	`}`	266	`}`
257	`}`	267	`}`
258		268
259	`/* "file changed" flag */`	269	`/* "file changed" flag */`
260	`{`	270	`{`
261	`char flg = ' ';`	271	`char flg = ' ';`
262	`if (db->modflag) flg = '*';`	272	`if (db->modflag) flg = '*';`
263	`mdr_cout_char(screenh - 1, 0, flg, scheme[COL_STATUSBAR1]);`	273	`mdr_cout_char(screenh - 1, 0, flg, scheme[COL_STATUSBAR1]);`
264	`}`	274	`}`
265		275
266	`/* scroll bar */`	276	`/* scroll bar */`
267	`for (y = 0; y < (screenh - 1); y++) {`	277	`for (y = 0; y < (screenh - 1); y++) {`
268	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	278	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
269	`}`	279	`}`
270		280
271	`/* scroll cursor */`	281	`/* scroll cursor */`
272	`if (db->totlines >= screenh) {`	282	`if (db->totlines >= screenh) {`
273	`unsigned short topline = db->curline - db->cursorposy;`	283	`unsigned short topline = db->curline - db->cursorposy;`
274	`unsigned short col;`	284	`unsigned short col;`
275	`unsigned short totlines = db->totlines - screenh + 1;`	285	`unsigned short totlines = db->totlines - screenh + 1;`
276	`if (db->totlines - screenh > screenh) {`	286	`if (db->totlines - screenh > screenh) {`
277	`col = topline / (totlines / (screenh - 1));`	287	`col = topline / (totlines / (screenh - 1));`
278	`} else {`	288	`} else {`
279	`col = topline * (screenh - 1) / totlines;`	289	`col = topline * (screenh - 1) / totlines;`
280	`}`	290	`}`
281	`if (col >= screenh - 1) col = screenh - 2;`	291	`if (col >= screenh - 1) col = screenh - 2;`
282	`mdr_cout_char(col, screenw - 1, ' ', scheme[COL_SCROLLBAR]);`	292	`mdr_cout_char(col, screenw - 1, ' ', scheme[COL_SCROLLBAR]);`
283	`}`	293	`}`
284	`}`	294	`}`
285		295
286		296
287	`static void check_cursor_not_after_eol(struct file *db) {`	297	`static void check_cursor_not_after_eol(struct file *db) {`
288	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	298	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
289		299
290	`if (db->cursor->len < db->xoffset) {`	300	`if (db->cursor->len < db->xoffset) {`
291	`db->cursorposx = 0;`	301	`db->cursorposx = 0;`
292	`db->xoffset = db->cursor->len;`	302	`db->xoffset = db->cursor->len;`
293	`uidirty.from = 0;`	303	`uidirty.from = 0;`
294	`uidirty.to = 0xff;`	304	`uidirty.to = 0xff;`
295	`} else {`	305	`} else {`
296	`db->cursorposx = db->cursor->len - db->xoffset;`	306	`db->cursorposx = db->cursor->len - db->xoffset;`
297	`}`	307	`}`
298	`}`	308	`}`
299		309
300		310
301	`static void cursor_up(struct file *db) {`	311	`static void cursor_up(struct file *db) {`
302	`if (db->cursor->prev != NULL) {`	312	`if (db->cursor->prev != NULL) {`
303	`db->curline -= 1;`	313	`db->curline -= 1;`
304	`db->cursor = db->cursor->prev;`	314	`db->cursor = db->cursor->prev;`
305	`if (db->cursorposy == 0) {`	315	`if (db->cursorposy == 0) {`
306	`uidirty.from = 0;`	316	`uidirty.from = 0;`
307	`uidirty.to = 0xff;`	317	`uidirty.to = 0xff;`
308	`} else {`	318	`} else {`
309	`db->cursorposy -= 1;`	319	`db->cursorposy -= 1;`
310	`}`	320	`}`
311	`}`	321	`}`
312	`}`	322	`}`
313		323
314		324
315	`static void cursor_eol(struct file *db) {`	325	`static void cursor_eol(struct file *db) {`
316	`/* adjust xoffset to make sure eol is visible on screen */`	326	`/* adjust xoffset to make sure eol is visible on screen */`
317	`if (db->xoffset > db->cursor->len) {`	327	`if (db->xoffset > db->cursor->len) {`
318	`db->xoffset = db->cursor->len - 1;`	328	`db->xoffset = db->cursor->len - 1;`
319	`uidirty.from = 0;`	329	`uidirty.from = 0;`
320	`uidirty.to = 0xff;`	330	`uidirty.to = 0xff;`
321	`}`	331	`}`
322		332
323	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	333	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
324	`db->xoffset = db->cursor->len - screenw + 2;`	334	`db->xoffset = db->cursor->len - screenw + 2;`
325	`uidirty.from = 0;`	335	`uidirty.from = 0;`
326	`uidirty.to = 0xff;`	336	`uidirty.to = 0xff;`
327	`}`	337	`}`
328	`db->cursorposx = db->cursor->len - db->xoffset;`	338	`db->cursorposx = db->cursor->len - db->xoffset;`
329	`}`	339	`}`
330		340
331		341
332	`static void cursor_down(struct file *db) {`	342	`static void cursor_down(struct file *db) {`
333	`if (db->cursor->next != NULL) {`	343	`if (db->cursor->next != NULL) {`
334	`db->curline += 1;`	344	`db->curline += 1;`
335	`db->cursor = db->cursor->next;`	345	`db->cursor = db->cursor->next;`
336	`if (db->cursorposy < screenh - 2) {`	346	`if (db->cursorposy < screenh - 2) {`
337	`db->cursorposy += 1;`	347	`db->cursorposy += 1;`
338	`} else {`	348	`} else {`
339	`uidirty.from = 0;`	349	`uidirty.from = 0;`
340	`uidirty.to = 0xff;`	350	`uidirty.to = 0xff;`
341	`}`	351	`}`
342	`}`	352	`}`
343	`}`	353	`}`
344		354
345		355
346	`static void cursor_left(struct file *db) {`	356	`static void cursor_left(struct file *db) {`
347	`if (db->cursorposx > 0) {`	357	`if (db->cursorposx > 0) {`
348	`db->cursorposx -= 1;`	358	`db->cursorposx -= 1;`
349	`} else if (db->xoffset > 0) {`	359	`} else if (db->xoffset > 0) {`
350	`db->xoffset -= 1;`	360	`db->xoffset -= 1;`
351	`uidirty.from = 0;`	361	`uidirty.from = 0;`
352	`uidirty.to = 0xff;`	362	`uidirty.to = 0xff;`
353	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	363	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
354	`cursor_up(db);`	364	`cursor_up(db);`
355	`cursor_eol(db);`	365	`cursor_eol(db);`
356	`}`	366	`}`
357	`}`	367	`}`
358		368
359		369
360	`static void cursor_home(struct file *db) {`	370	`static void cursor_home(struct file *db) {`
361	`db->cursorposx = 0;`	371	`db->cursorposx = 0;`
362	`if (db->xoffset != 0) {`	372	`if (db->xoffset != 0) {`
363	`db->xoffset = 0;`	373	`db->xoffset = 0;`
364	`uidirty.from = 0;`	374	`uidirty.from = 0;`
365	`uidirty.to = 0xff;`	375	`uidirty.to = 0xff;`
366	`}`	376	`}`
367	`}`	377	`}`
368		378
369		379
370	`static void cursor_right(struct file *db) {`	380	`static void cursor_right(struct file *db) {`
371	`if (db->cursor->len > db->xoffset + db->cursorposx) {`	381	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
372	`if (db->cursorposx < screenw - 2) {`	382	`if (db->cursorposx < screenw - 2) {`
373	`db->cursorposx += 1;`	383	`db->cursorposx += 1;`
374	`} else {`	384	`} else {`
375	`db->xoffset += 1;`	385	`db->xoffset += 1;`
376	`uidirty.from = 0;`	386	`uidirty.from = 0;`
377	`uidirty.to = 0xff;`	387	`uidirty.to = 0xff;`
378	`}`	388	`}`
379	`} else {`	389	`} else {`
380	`cursor_down(db);`	390	`cursor_down(db);`
381	`cursor_home(db);`	391	`cursor_home(db);`
382	`}`	392	`}`
383	`}`	393	`}`
384		394
385		395
386	`static void del(struct file *db) {`	396	`static void del(struct file *db) {`
387	`if (db->cursorposx + db->xoffset < db->cursor->len) {`	397	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
388	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`	398	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`
389	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	399	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
390	`uidirty.from = db->cursorposy;`	400	`uidirty.from = db->cursorposy;`
391	`uidirty.to = db->cursorposy;`	401	`uidirty.to = db->cursorposy;`
392	`db->modflag = 1;`	402	`db->modflag = 1;`
393	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	403	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`
394	`struct line far *nextline = db->cursor->next;`	404	`struct line far *nextline = db->cursor->next;`
395	`if (db->cursor->next->len > 0) {`	405	`if (db->cursor->next->len > 0) {`
396	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	406	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
397	`if (newptr != NULL) {`	407	`if (newptr != NULL) {`
398	`db->cursor = newptr;`	408	`db->cursor = newptr;`
399	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	409	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
400	`db->cursor->len += db->cursor->next->len;`	410	`db->cursor->len += db->cursor->next->len;`
401	`}`	411	`}`
402	`}`	412	`}`
403	`db->cursor->next = db->cursor->next->next;`	413	`db->cursor->next = db->cursor->next->next;`
404	`db->cursor->next->prev = db->cursor;`	414	`db->cursor->next->prev = db->cursor;`
405	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	415	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
406	`_ffree(nextline);`	416	`_ffree(nextline);`
407	`uidirty.from = db->cursorposy;`	417	`uidirty.from = db->cursorposy;`
408	`uidirty.to = 0xff;`	418	`uidirty.to = 0xff;`
409	`db->totlines -= 1;`	419	`db->totlines -= 1;`
410	`db->modflag = 1;`	420	`db->modflag = 1;`
411	`}`	421	`}`
412	`}`	422	`}`
413		423
414		424
415	`static void bkspc(struct file *db) {`	425	`static void bkspc(struct file *db) {`
416		426
417	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	427	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
418	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	428	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
419		429
420	`cursor_left(db);`	430	`cursor_left(db);`
421	`del(db);`	431	`del(db);`
422	`}`	432	`}`
423		433
424		434
425	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	435	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
426	`* of argc and argv, saves some 330 bytes of binary size */`	436	`* of argc and argv, saves some 330 bytes of binary size */`
427	`static char *parseargv(void) {`	437	`static char *parseargv(void) {`
428	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	438	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
429	`unsigned char count = 0;`	439	`unsigned char count = 0;`
430	`char *argv[4];`	440	`char *argv[4];`
431		441
432	`while (count < 4) {`	442	`while (count < 4) {`
433	`/* jump to nearest arg */`	443	`/* jump to nearest arg */`
434	`while (*tail == ' ') {`	444	`while (*tail == ' ') {`
435	`*tail = 0;`	445	`*tail = 0;`
436	`tail++;`	446	`tail++;`
437	`}`	447	`}`
438		448
439	`if (*tail == '\r') {`	449	`if (*tail == '\r') {`
440	`*tail = 0;`	450	`*tail = 0;`
441	`break;`	451	`break;`
442	`}`	452	`}`
443		453
444	`argv[count++] = tail;`	454	`argv[count++] = tail;`
445		455
446	`/* jump to next delimiter */`	456	`/* jump to next delimiter */`
447	`while ((tail != ' ') && (tail != '\r')) tail++;`	457	`while ((tail != ' ') && (tail != '\r')) tail++;`
448	`}`	458	`}`
449		459
450	`/* check args now */`	460	`/* check args now */`
451	`if (count == 0) return("");`	461	`if (count == 0) return("");`
452		462
453	`return(argv[0]);`	463	`return(argv[0]);`
454	`}`	464	`}`
455		465
456		466
457	`static struct file loadfile(const char fname) {`	467	`static struct file loadfile(const char fname) {`
458	`char buff[512]; /* read one entire sector at a time (faster) */`	468	`char buff[512]; /* read one entire sector at a time (faster) */`
459	`char *buffptr;`	469	`char *buffptr;`
460	`unsigned int len, llen;`	470	`unsigned int len, llen;`
461	`int fd;`	471	`int fd;`
462	`unsigned char eolfound;`	472	`unsigned char eolfound;`
463	`struct file *db;`	473	`struct file *db;`
464		474
465	`len = strlen(fname) + 1;`	475	`len = strlen(fname) + 1;`
466	`db = calloc(1, sizeof(struct file) + len);`	476	`db = calloc(1, sizeof(struct file) + len);`
467	`if (db == NULL) return(NULL);`	477	`if (db == NULL) return(NULL);`
468	`memcpy(db->fname, fname, len);`	478	`memcpy(db->fname, fname, len);`
469		479
470	`if (*fname == 0) goto SKIPLOADING;`	480	`if (*fname == 0) goto SKIPLOADING;`
471		481
472	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	482	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
473	`mdr_coutraw_puts("Failed to open file:");`	483	`mdr_coutraw_puts("Failed to open file:");`
474	`mdr_coutraw_puts(fname);`	484	`mdr_coutraw_puts(fname);`
475	`free(db);`	485	`free(db);`
476	`return(NULL);`	486	`return(NULL);`
477	`}`	487	`}`
478		488
479	`db->lfonly = 1;`	489	`db->lfonly = 1;`
480		490
481	`/* start by adding an empty line */`	491	`/* start by adding an empty line */`
482	`if (line_add(db, NULL, 0) != 0) {`	492	`if (line_add(db, NULL, 0) != 0) {`
483	`/* TODO ERROR HANDLING */`	493	`/* TODO ERROR HANDLING */`
484	`}`	494	`}`
485		495
486	`for (eolfound = 0;;) {`	496	`for (eolfound = 0;;) {`
487	`unsigned short consumedbytes;`	497	`unsigned short consumedbytes;`
488		498
489	`if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) \|\| (len == 0)) break;`	499	`if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) \|\| (len == 0)) break;`
490	`buffptr = buff;`	500	`buffptr = buff;`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1388 – Rev 1330 → 1331