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 *msg, unsigned char attr) {
  unsigned short x, y, msglen, i;
  msglen = strlen(msg);
  y = (screenh - 4) >> 1;
  x = (screenw - msglen - 4) >> 1;
  for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);
  mdr_cout_str(y+1, x+1, msg, attr, msglen);
 
  if (uidirty.from > y) uidirty.from = y;
  if (uidirty.to < y+3) uidirty.to = y+3;
}
 
 
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 */
      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), scheme[COL_MSG]);
        mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
      } else {
        ui_msg(svarlang_str(0, 3), 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 1328	Rev 1330
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 fname[1]; /* dynamically sized */`	79	`char fname[1]; /* dynamically sized */`
79	`};`	80	`};`
80		81
81		82
82	`/*****************************************************************************`	83	`/*****************************************************************************`
83	`* functions *`	84	`* functions *`
84	`*****************************************************************************/`	85	`*****************************************************************************/`
85		86
86	`/* 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`
87	`* returns non-zero on error */`	88	`* returns non-zero on error */`
88	`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) {`
89	`struct line far *l;`	90	`struct line far *l;`
90		91
91	`l = _fcalloc(1, sizeof(struct line) + slen);`	92	`l = _fcalloc(1, sizeof(struct line) + slen);`
92	`if (l == NULL) return(-1);`	93	`if (l == NULL) return(-1);`
93		94
94	`l->prev = db->cursor;`	95	`l->prev = db->cursor;`
95	`if (db->cursor) {`	96	`if (db->cursor) {`
96	`l->next = db->cursor->next;`	97	`l->next = db->cursor->next;`
97	`db->cursor->next = l;`	98	`db->cursor->next = l;`
98	`l->next->prev = l;`	99	`l->next->prev = l;`
99	`}`	100	`}`
100	`db->cursor = l;`	101	`db->cursor = l;`
101	`_fmemcpy(l->payload, line, slen);`	102	`_fmemcpy(l->payload, line, slen);`
102	`l->len = slen;`	103	`l->len = slen;`
103		104
104	`db->totlines += 1;`	105	`db->totlines += 1;`
105	`db->curline += 1;`	106	`db->curline += 1;`
106		107
107	`return(0);`	108	`return(0);`
108	`}`	109	`}`
109		110
110		111
111	`/* append a nul-terminated string to line at cursor position */`	112	`/* append a nul-terminated string to line at cursor position */`
112	`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) {`
113	`struct line far *n;`	114	`struct line far *n;`
114	`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 */`
115	`n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);`	116	`n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);`
116	`if (n == NULL) return(-1);`	117	`if (n == NULL) return(-1);`
117	`f->cursor = n;`	118	`f->cursor = n;`
118	`_fmemcpy(f->cursor->payload + f->cursor->len, buf, len);`	119	`_fmemcpy(f->cursor->payload + f->cursor->len, buf, len);`
119	`f->cursor->len += len;`	120	`f->cursor->len += len;`
120		121
121	`/* rewire the linked list */`	122	`/* rewire the linked list */`
122	`if (f->cursor->next) f->cursor->next->prev = f->cursor;`	123	`if (f->cursor->next) f->cursor->next->prev = f->cursor;`
123	`if (f->cursor->prev) f->cursor->prev->next = f->cursor;`	124	`if (f->cursor->prev) f->cursor->prev->next = f->cursor;`
124		125
125	`return(0);`	126	`return(0);`
126	`}`	127	`}`
127		128
128		129
129	`static void db_rewind(struct file *db) {`	130	`static void db_rewind(struct file *db) {`
130	`if (db->cursor == NULL) return;`	131	`if (db->cursor == NULL) return;`
131	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	132	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
132	`db->curline = 0;`	133	`db->curline = 0;`
133	`}`	134	`}`
134		135
135		136
136	`static void load_colorscheme(void) {`	137	`static void load_colorscheme(void) {`
137	`scheme[COL_TXT] = 0x17;`	138	`scheme[COL_TXT] = 0x17;`
138	`scheme[COL_STATUSBAR1] = 0x70;`	139	`scheme[COL_STATUSBAR1] = 0x70;`
139	`scheme[COL_STATUSBAR2] = 0x78;`	140	`scheme[COL_STATUSBAR2] = 0x78;`
140	`scheme[COL_SCROLLBAR] = 0x70;`	141	`scheme[COL_SCROLLBAR] = 0x70;`
141	`scheme[COL_MSG] = 0xf0;`	142	`scheme[COL_MSG] = 0xf0;`
142	`scheme[COL_ERR] = 0x4f;`	143	`scheme[COL_ERR] = 0x4f;`
143	`}`	144	`}`
144		145
145		146
146	`static void ui_basic(const struct file *db) {`	147	`static void ui_basic(const struct file *db) {`
147	`const char s = svarlang_strid(0); / HELP */`	148	`const char s = svarlang_strid(0); / HELP */`
148	`unsigned char helpcol = screenw - (strlen(s) + 4);`	149	`unsigned char helpcol = screenw - (strlen(s) + 4);`
149		150
150	`/* fill status bar with background */`	151	`/* fill status bar with background (without modflag as it is refreshed by ui_refresh) */`
151	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`	152	`mdr_cout_char_rep(screenh - 1, 1, ' ', scheme[COL_STATUSBAR1], screenw - 1);`
152		153
153	`/* filename */`	154	`/* filename */`
-		155	`{`
154	`if (db->fname[0] == 0) {`	156	`const char *fn = db->fname;`
155	`mdr_cout_str(screenh - 1, 0, svarlang_str(0, 1), scheme[COL_STATUSBAR1], screenw);`	157	`if (*fn == 0) fn = svarlang_str(0, 1);`
156	`} else {`	-
157	`mdr_cout_str(screenh - 1, 0, db->fname, scheme[COL_STATUSBAR1], screenw);`	158	`mdr_cout_str(screenh - 1, 1, fn, scheme[COL_STATUSBAR1], screenw);`
158	`}`	159	`}`
159		160
160	`/* eol type */`	161	`/* eol type */`
161	`if (db->lfonly) {`	162	`{`
162	`mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);`	163	`const char *eoltype = "CRLF";`
163	`} else {`	164	`if (db->lfonly) eoltype = "LF";`
164	`mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);`	165	`mdr_cout_str(screenh - 1, helpcol - 5, eoltype, scheme[COL_STATUSBAR1], 5);`
165	`}`	166	`}`
166		167
167	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	168	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
168	`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);`
169	`}`	170	`}`
170		171
171		172
172	`static void ui_msg(const char *msg, unsigned char attr) {`	173	`static void ui_msg(const char *msg, unsigned char attr) {`
173	`unsigned short x, y, msglen, i;`	174	`unsigned short x, y, msglen, i;`
174	`msglen = strlen(msg);`	175	`msglen = strlen(msg);`
175	`y = (screenh - 4) >> 1;`	176	`y = (screenh - 4) >> 1;`
176	`x = (screenw - msglen - 4) >> 1;`	177	`x = (screenw - msglen - 4) >> 1;`
177	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`	178	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`
178	`mdr_cout_str(y+1, x+1, msg, attr, msglen);`	179	`mdr_cout_str(y+1, x+1, msg, attr, msglen);`
179		180
180	`if (uidirty.from > y) uidirty.from = y;`	181	`if (uidirty.from > y) uidirty.from = y;`
181	`if (uidirty.to < y+2) uidirty.to = y+2;`	182	`if (uidirty.to < y+3) uidirty.to = y+3;`
182	`}`	183	`}`
183		184
184		185
185	`static void ui_help(void) {`	186	`static void ui_help(void) {`
186	`#define MAXLINLEN 35`	187	`#define MAXLINLEN 35`
187	`unsigned short i, offset;`	188	`unsigned short i, offset;`
188	`offset = (screenw - MAXLINLEN + 2) >> 1;`	189	`offset = (screenw - MAXLINLEN + 2) >> 1;`
189	`mdr_cout_cursor_hide();`	190	`mdr_cout_cursor_hide();`
190	`for (i = 2; i <= 15; i++) {`	191	`for (i = 2; i <= 15; i++) {`
191	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);`	192	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);`
192	`}`	193	`}`
193		194
194	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`	195	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`
195	`for (i = 0; i <= 4; i++) {`	196	`for (i = 0; i <= 4; i++) {`
196	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`	197	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`
197	`}`	198	`}`
198	`mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`	199	`mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`
199		200
200	`/* Press any key */`	201	`/* Press any key */`
201	`mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`	202	`mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`
202		203
203	`keyb_getkey();`	204	`keyb_getkey();`
204	`mdr_cout_cursor_show();`	205	`mdr_cout_cursor_show();`
205	`#undef MAXLINLEN`	206	`#undef MAXLINLEN`
206	`}`	207	`}`
207		208
208		209
209	`static void ui_refresh(const struct file *db) {`	210	`static void ui_refresh(const struct file *db) {`
210	`unsigned char x;`	211	`unsigned char x;`
211	`const struct line far *l;`	212	`const struct line far *l;`
212	`unsigned char y = db->cursorposy;`	213	`unsigned char y = db->cursorposy;`
213		214
214	`#ifdef DBG_REFRESH`	215	`#ifdef DBG_REFRESH`
215	`static char m = 'a';`	216	`static char m = 'a';`
216	`m++;`	217	`m++;`
217	`if (m > 'z') m = 'a';`	218	`if (m > 'z') m = 'a';`
218	`#endif`	219	`#endif`
219		220
220	`/* rewind cursor line to first line that needs redrawing */`	221	`/* rewind cursor line to first line that needs redrawing */`
221	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`	222	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`
222		223
223	`/* iterate over lines and redraw whatever needs to be redrawn */`	224	`/* iterate over lines and redraw whatever needs to be redrawn */`
224	`for (; l != NULL; l = l->next, y++) {`	225	`for (; l != NULL; l = l->next, y++) {`
225		226
226	`/* skip lines that do not need to be refreshed */`	227	`/* skip lines that do not need to be refreshed */`
227	`if (y < uidirty.from) continue;`	228	`if (y < uidirty.from) continue;`
228	`if (y > uidirty.to) break;`	229	`if (y > uidirty.to) break;`
229		230
230	`x = 0;`	231	`x = 0;`
231	`if (db->xoffset < l->len) {`	232	`if (db->xoffset < l->len) {`
232	`unsigned char i, limit;`	233	`unsigned char i, limit;`
233	`if (l->len - db->xoffset < screenw) {`	234	`if (l->len - db->xoffset < screenw) {`
234	`limit = l->len;`	235	`limit = l->len;`
235	`} else {`	236	`} else {`
236	`limit = db->xoffset + screenw - 1;`	237	`limit = db->xoffset + screenw - 1;`
237	`}`	238	`}`
238	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`	239	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`
239	`}`	240	`}`
240		241
241	`/* write empty spaces until end of line */`	242	`/* write empty spaces until end of line */`
242	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`	243	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`
243		244
244	`#ifdef DBG_REFRESH`	245	`#ifdef DBG_REFRESH`
245	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	246	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
246	`#endif`	247	`#endif`
247		248
248	`if (y == screenh - 2) break;`	249	`if (y == screenh - 2) break;`
249	`}`	250	`}`
250		251
251	`/* fill all lines below if empty (and they need to be redrawn) */`	252	`/* fill all lines below if empty (and they need to be redrawn) */`
252	`if (l == NULL) {`	253	`if (l == NULL) {`
253	`while ((y < screenh - 1) && (y < uidirty.to)) {`	254	`while ((y < screenh - 1) && (y < uidirty.to)) {`
254	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`	255	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`
255	`}`	256	`}`
256	`}`	257	`}`
257		258
-		259	`/* "file changed" flag */`
-		260	`{`
-		261	`char flg = ' ';`
-		262	`if (db->modflag) flg = '*';`
-		263	`mdr_cout_char(screenh - 1, 0, flg, scheme[COL_STATUSBAR1]);`
-		264	`}`
-		265
258	`/* scroll bar */`	266	`/* scroll bar */`
259	`for (y = 0; y < (screenh - 1); y++) {`	267	`for (y = 0; y < (screenh - 1); y++) {`
260	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	268	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
261	`}`	269	`}`
262		270
263	`/* scroll cursor */`	271	`/* scroll cursor */`
264	`if (db->totlines >= screenh) {`	272	`if (db->totlines >= screenh) {`
265	`unsigned short topline = db->curline - db->cursorposy;`	273	`unsigned short topline = db->curline - db->cursorposy;`
266	`unsigned short col;`	274	`unsigned short col;`
267	`unsigned short totlines = db->totlines - screenh + 1;`	275	`unsigned short totlines = db->totlines - screenh + 1;`
268	`if (db->totlines - screenh > screenh) {`	276	`if (db->totlines - screenh > screenh) {`
269	`col = topline / (totlines / (screenh - 1));`	277	`col = topline / (totlines / (screenh - 1));`
270	`} else {`	278	`} else {`
271	`col = topline * (screenh - 1) / totlines;`	279	`col = topline * (screenh - 1) / totlines;`
272	`}`	280	`}`
273	`if (col >= screenh - 1) col = screenh - 2;`	281	`if (col >= screenh - 1) col = screenh - 2;`
274	`mdr_cout_char(col, screenw - 1, ' ', scheme[COL_SCROLLBAR]);`	282	`mdr_cout_char(col, screenw - 1, ' ', scheme[COL_SCROLLBAR]);`
275	`}`	283	`}`
276	`}`	284	`}`
277		285
278		286
279	`static void check_cursor_not_after_eol(struct file *db) {`	287	`static void check_cursor_not_after_eol(struct file *db) {`
280	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	288	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
281		289
282	`if (db->cursor->len < db->xoffset) {`	290	`if (db->cursor->len < db->xoffset) {`
283	`db->cursorposx = 0;`	291	`db->cursorposx = 0;`
284	`db->xoffset = db->cursor->len;`	292	`db->xoffset = db->cursor->len;`
285	`uidirty.from = 0;`	293	`uidirty.from = 0;`
286	`uidirty.to = 0xff;`	294	`uidirty.to = 0xff;`
287	`} else {`	295	`} else {`
288	`db->cursorposx = db->cursor->len - db->xoffset;`	296	`db->cursorposx = db->cursor->len - db->xoffset;`
289	`}`	297	`}`
290	`}`	298	`}`
291		299
292		300
293	`static void cursor_up(struct file *db) {`	301	`static void cursor_up(struct file *db) {`
294	`if (db->cursor->prev != NULL) {`	302	`if (db->cursor->prev != NULL) {`
295	`db->curline -= 1;`	303	`db->curline -= 1;`
296	`db->cursor = db->cursor->prev;`	304	`db->cursor = db->cursor->prev;`
297	`if (db->cursorposy == 0) {`	305	`if (db->cursorposy == 0) {`
298	`uidirty.from = 0;`	306	`uidirty.from = 0;`
299	`uidirty.to = 0xff;`	307	`uidirty.to = 0xff;`
300	`} else {`	308	`} else {`
301	`db->cursorposy -= 1;`	309	`db->cursorposy -= 1;`
302	`}`	310	`}`
303	`}`	311	`}`
304	`}`	312	`}`
305		313
306		314
307	`static void cursor_eol(struct file *db) {`	315	`static void cursor_eol(struct file *db) {`
308	`/* adjust xoffset to make sure eol is visible on screen */`	316	`/* adjust xoffset to make sure eol is visible on screen */`
309	`if (db->xoffset > db->cursor->len) {`	317	`if (db->xoffset > db->cursor->len) {`
310	`db->xoffset = db->cursor->len - 1;`	318	`db->xoffset = db->cursor->len - 1;`
311	`uidirty.from = 0;`	319	`uidirty.from = 0;`
312	`uidirty.to = 0xff;`	320	`uidirty.to = 0xff;`
313	`}`	321	`}`
314		322
315	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	323	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
316	`db->xoffset = db->cursor->len - screenw + 2;`	324	`db->xoffset = db->cursor->len - screenw + 2;`
317	`uidirty.from = 0;`	325	`uidirty.from = 0;`
318	`uidirty.to = 0xff;`	326	`uidirty.to = 0xff;`
319	`}`	327	`}`
320	`db->cursorposx = db->cursor->len - db->xoffset;`	328	`db->cursorposx = db->cursor->len - db->xoffset;`
321	`}`	329	`}`
322		330
323		331
324	`static void cursor_down(struct file *db) {`	332	`static void cursor_down(struct file *db) {`
325	`if (db->cursor->next != NULL) {`	333	`if (db->cursor->next != NULL) {`
326	`db->curline += 1;`	334	`db->curline += 1;`
327	`db->cursor = db->cursor->next;`	335	`db->cursor = db->cursor->next;`
328	`if (db->cursorposy < screenh - 2) {`	336	`if (db->cursorposy < screenh - 2) {`
329	`db->cursorposy += 1;`	337	`db->cursorposy += 1;`
330	`} else {`	338	`} else {`
331	`uidirty.from = 0;`	339	`uidirty.from = 0;`
332	`uidirty.to = 0xff;`	340	`uidirty.to = 0xff;`
333	`}`	341	`}`
334	`}`	342	`}`
335	`}`	343	`}`
336		344
337		345
338	`static void cursor_left(struct file *db) {`	346	`static void cursor_left(struct file *db) {`
339	`if (db->cursorposx > 0) {`	347	`if (db->cursorposx > 0) {`
340	`db->cursorposx -= 1;`	348	`db->cursorposx -= 1;`
341	`} else if (db->xoffset > 0) {`	349	`} else if (db->xoffset > 0) {`
342	`db->xoffset -= 1;`	350	`db->xoffset -= 1;`
343	`uidirty.from = 0;`	351	`uidirty.from = 0;`
344	`uidirty.to = 0xff;`	352	`uidirty.to = 0xff;`
345	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	353	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
346	`cursor_up(db);`	354	`cursor_up(db);`
347	`cursor_eol(db);`	355	`cursor_eol(db);`
348	`}`	356	`}`
349	`}`	357	`}`
350		358
351		359
352	`static void cursor_home(struct file *db) {`	360	`static void cursor_home(struct file *db) {`
353	`db->cursorposx = 0;`	361	`db->cursorposx = 0;`
354	`if (db->xoffset != 0) {`	362	`if (db->xoffset != 0) {`
355	`db->xoffset = 0;`	363	`db->xoffset = 0;`
356	`uidirty.from = 0;`	364	`uidirty.from = 0;`
357	`uidirty.to = 0xff;`	365	`uidirty.to = 0xff;`
358	`}`	366	`}`
359	`}`	367	`}`
360		368
361		369
362	`static void cursor_right(struct file *db) {`	370	`static void cursor_right(struct file *db) {`
363	`if (db->cursor->len > db->xoffset + db->cursorposx) {`	371	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
364	`if (db->cursorposx < screenw - 2) {`	372	`if (db->cursorposx < screenw - 2) {`
365	`db->cursorposx += 1;`	373	`db->cursorposx += 1;`
366	`} else {`	374	`} else {`
367	`db->xoffset += 1;`	375	`db->xoffset += 1;`
368	`uidirty.from = 0;`	376	`uidirty.from = 0;`
369	`uidirty.to = 0xff;`	377	`uidirty.to = 0xff;`
370	`}`	378	`}`
371	`} else {`	379	`} else {`
372	`cursor_down(db);`	380	`cursor_down(db);`
373	`cursor_home(db);`	381	`cursor_home(db);`
374	`}`	382	`}`
375	`}`	383	`}`
376		384
377		385
378	`static void del(struct file *db) {`	386	`static void del(struct file *db) {`
379	`if (db->cursorposx + db->xoffset < db->cursor->len) {`	387	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
380	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`	388	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`
381	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	389	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
382	`uidirty.from = db->cursorposy;`	390	`uidirty.from = db->cursorposy;`
383	`uidirty.to = db->cursorposy;`	391	`uidirty.to = db->cursorposy;`
-		392	`db->modflag = 1;`
384	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	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) */`
385	`struct line far *nextline = db->cursor->next;`	394	`struct line far *nextline = db->cursor->next;`
386	`if (db->cursor->next->len > 0) {`	395	`if (db->cursor->next->len > 0) {`
387	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	396	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
388	`if (newptr != NULL) {`	397	`if (newptr != NULL) {`
389	`db->cursor = newptr;`	398	`db->cursor = newptr;`
390	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	399	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
391	`db->cursor->len += db->cursor->next->len;`	400	`db->cursor->len += db->cursor->next->len;`
392	`}`	401	`}`
393	`}`	402	`}`
394	`db->cursor->next = db->cursor->next->next;`	403	`db->cursor->next = db->cursor->next->next;`
395	`db->cursor->next->prev = db->cursor;`	404	`db->cursor->next->prev = db->cursor;`
396	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	405	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
397	`_ffree(nextline);`	406	`_ffree(nextline);`
398	`uidirty.from = db->cursorposy;`	407	`uidirty.from = db->cursorposy;`
399	`uidirty.to = 0xff;`	408	`uidirty.to = 0xff;`
400	`db->totlines -= 1;`	409	`db->totlines -= 1;`
-		410	`db->modflag = 1;`
401	`}`	411	`}`
402	`}`	412	`}`
403		413
404		414
405	`static void bkspc(struct file *db) {`	415	`static void bkspc(struct file *db) {`
406		416
407	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	417	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
408	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	418	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
409		419
410	`cursor_left(db);`	420	`cursor_left(db);`
411	`del(db);`	421	`del(db);`
412	`}`	422	`}`
413		423
414		424
415	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	425	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
416	`* of argc and argv, saves some 330 bytes of binary size */`	426	`* of argc and argv, saves some 330 bytes of binary size */`
417	`static char *parseargv(void) {`	427	`static char *parseargv(void) {`
418	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	428	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
419	`unsigned char count = 0;`	429	`unsigned char count = 0;`
420	`char *argv[4];`	430	`char *argv[4];`
421		431
422	`while (count < 4) {`	432	`while (count < 4) {`
423	`/* jump to nearest arg */`	433	`/* jump to nearest arg */`
424	`while (*tail == ' ') {`	434	`while (*tail == ' ') {`
425	`*tail = 0;`	435	`*tail = 0;`
426	`tail++;`	436	`tail++;`
427	`}`	437	`}`
428		438
429	`if (*tail == '\r') {`	439	`if (*tail == '\r') {`
430	`*tail = 0;`	440	`*tail = 0;`
431	`break;`	441	`break;`
432	`}`	442	`}`
433		443
434	`argv[count++] = tail;`	444	`argv[count++] = tail;`
435		445
436	`/* jump to next delimiter */`	446	`/* jump to next delimiter */`
437	`while ((tail != ' ') && (tail != '\r')) tail++;`	447	`while ((tail != ' ') && (tail != '\r')) tail++;`
438	`}`	448	`}`
439		449
440	`/* check args now */`	450	`/* check args now */`
441	`if (count == 0) return("");`	451	`if (count == 0) return("");`
442		452
443	`return(argv[0]);`	453	`return(argv[0]);`
444	`}`	454	`}`
445		455
446		456
447	`static struct file loadfile(const char fname) {`	457	`static struct file loadfile(const char fname) {`
448	`char buff[512]; /* read one entire sector at a time (faster) */`	458	`char buff[512]; /* read one entire sector at a time (faster) */`
449	`char *buffptr;`	459	`char *buffptr;`
450	`unsigned int len, llen;`	460	`unsigned int len, llen;`
451	`int fd;`	461	`int fd;`
452	`unsigned char eolfound;`	462	`unsigned char eolfound;`
453	`struct file *db;`	463	`struct file *db;`
454		464
455	`len = strlen(fname) + 1;`	465	`len = strlen(fname) + 1;`
456	`db = calloc(1, sizeof(struct file) + len);`	466	`db = calloc(1, sizeof(struct file) + len);`
457	`if (db == NULL) return(NULL);`	467	`if (db == NULL) return(NULL);`
458	`memcpy(db->fname, fname, len);`	468	`memcpy(db->fname, fname, len);`
459		469
460	`if (*fname == 0) goto SKIPLOADING;`	470	`if (*fname == 0) goto SKIPLOADING;`
461		471
462	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	472	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
463	`mdr_coutraw_puts("Failed to open file:");`	473	`mdr_coutraw_puts("Failed to open file:");`
464	`mdr_coutraw_puts(fname);`	474	`mdr_coutraw_puts(fname);`
465	`free(db);`	475	`free(db);`
466	`return(NULL);`	476	`return(NULL);`
467	`}`	477	`}`
468		478
469	`db->lfonly = 1;`	479	`db->lfonly = 1;`
470		480
471	`/* start by adding an empty line */`	481	`/* start by adding an empty line */`
472	`if (line_add(db, NULL, 0) != 0) {`	482	`if (line_add(db, NULL, 0) != 0) {`
473	`/* TODO ERROR HANDLING */`	483	`/* TODO ERROR HANDLING */`
474	`}`	484	`}`
475		485
476	`for (eolfound = 0;;) {`	486	`for (eolfound = 0;;) {`
477	`unsigned short consumedbytes;`	487	`unsigned short consumedbytes;`
478		488
479	`if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) \|\| (len == 0)) break;`	489	`if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) \|\| (len == 0)) break;`
480	`buffptr = buff;`	490	`buffptr = buff;`
481		491
482	`FINDLINE:`	492	`FINDLINE:`
483		493
484	`/* look for nearest \n */`	494	`/* look for nearest \n */`
485	`for (consumedbytes = 0;; consumedbytes++) {`	495	`for (consumedbytes = 0;; consumedbytes++) {`
486	`if (consumedbytes == len) {`	496	`if (consumedbytes == len) {`
487	`llen = consumedbytes;`	497	`llen = consumedbytes;`
488	`break;`	498	`break;`
489	`}`	499	`}`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1538 – Rev 1328 → 1330