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 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 */
  mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);
 
  /* filename */
  if (db->fname[0] == 0) {
    mdr_cout_str(screenh - 1, 0, svarlang_str(0, 1), scheme[COL_STATUSBAR1], screenw);
  } else {
    mdr_cout_str(screenh - 1, 0, db->fname, scheme[COL_STATUSBAR1], screenw);
  }
 
  /* eol type */
  if (db->lfonly) {
    mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);
  } else {
    mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", 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+2) uidirty.to = y+2;
}
 
 
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);
    }
  }
 
  /* 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;
  } 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;
  }
}
 
 
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;
    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->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) {
        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->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 1327	Rev 1328
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 union {`	-
56	`static struct {`	55	`static struct {`
57	`unsigned char from;`	56	`unsigned char from;`
58	`unsigned char to;`	57	`unsigned char to;`
59	`// };`	-
60	`// unsigned short fromto;`	-
61	`} 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 */`
62	`//} uidirty = {0xff, 0};`	-
63		59
64	`#define SCROLL_CURSOR 0xB1`	60	`#define SCROLL_CURSOR 0xB1`
65		61
66	`struct line {`	62	`struct line {`
67	`struct line far *prev;`	63	`struct line far *prev;`
68	`struct line far *next;`	64	`struct line far *next;`
69	`unsigned short len;`	65	`unsigned short len;`
70	`char payload[1];`	66	`char payload[1];`
71	`};`	67	`};`
72		68
73	`struct file {`	69	`struct file {`
74	`int fd;`	70	`int fd;`
75	`struct line far *cursor;`	71	`struct line far *cursor;`
76	`unsigned short xoffset;`	72	`unsigned short xoffset;`
77	`unsigned char cursorposx;`	73	`unsigned char cursorposx;`
78	`unsigned char cursorposy;`	74	`unsigned char cursorposy;`
-		75	`unsigned short totlines;`
-		76	`unsigned short curline;`
79	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`	77	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`
80	`char fname[1]; /* dynamically sized */`	78	`char fname[1]; /* dynamically sized */`
81	`};`	79	`};`
82		80
83		81
84	`/*****************************************************************************`	82	`/*****************************************************************************`
85	`* functions *`	83	`* functions *`
86	`*****************************************************************************/`	84	`*****************************************************************************/`
87		85
88	`/* adds a new line at cursor position into file linked list and dvance cursor`	86	`/* adds a new line at cursor position into file linked list and advance cursor`
89	`* returns non-zero on error */`	87	`* returns non-zero on error */`
90	`static int line_add(struct file db, const char far line) {`	88	`static int line_add(struct file db, const char far line, unsigned short slen) {`
91	`unsigned short slen;`	-
92	`struct line far *l;`	89	`struct line far *l;`
93		90
94	`/* slen = strlen(line) (but for far pointer) */`	-
95	`for (slen = 0; line[slen] != 0; slen++);`	-
96		-
97	`/* trim out CR/LF line endings */`	-
98	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`	-
99	`slen -= 2;`	-
100	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`	-
101	`slen--;`	-
102	`}`	-
103		-
104	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`	91	`l = _fcalloc(1, sizeof(struct line) + slen);`
105	`if (l == NULL) return(-1);`	92	`if (l == NULL) return(-1);`
106		93
107	`l->prev = db->cursor;`	94	`l->prev = db->cursor;`
108	`if (db->cursor) {`	95	`if (db->cursor) {`
109	`l->next = db->cursor->next;`	96	`l->next = db->cursor->next;`
110	`db->cursor->next = l;`	97	`db->cursor->next = l;`
111	`l->next->prev = l;`	98	`l->next->prev = l;`
112	`}`	99	`}`
113	`db->cursor = l;`	100	`db->cursor = l;`
114	`_fmemcpy(l->payload, line, slen);`	101	`_fmemcpy(l->payload, line, slen);`
115	`l->len = slen;`	102	`l->len = slen;`
116		103
-		104	`db->totlines += 1;`
-		105	`db->curline += 1;`
-		106
117	`return(0);`	107	`return(0);`
118	`}`	108	`}`
119		109
120		110
121	`/* append a nul-terminated string to line at cursor position */`	111	`/* append a nul-terminated string to line at cursor position */`
122	`static int line_append(struct file f, const char far buf, unsigned short len) {`	112	`static int line_append(struct file f, const char far buf, unsigned short len) {`
123	`struct line far *n;`	113	`struct line far *n;`
124	`if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */`	114	`if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */`
125	`n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);`	115	`n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);`
126	`if (n == NULL) return(-1);`	116	`if (n == NULL) return(-1);`
127	`f->cursor = n;`	117	`f->cursor = n;`
128	`_fmemcpy(f->cursor->payload + f->cursor->len, buf, len);`	118	`_fmemcpy(f->cursor->payload + f->cursor->len, buf, len);`
129	`f->cursor->len += len;`	119	`f->cursor->len += len;`
130		120
131	`/* rewire the linked list */`	121	`/* rewire the linked list */`
132	`if (f->cursor->next) f->cursor->next->prev = f->cursor;`	122	`if (f->cursor->next) f->cursor->next->prev = f->cursor;`
133	`if (f->cursor->prev) f->cursor->prev->next = f->cursor;`	123	`if (f->cursor->prev) f->cursor->prev->next = f->cursor;`
134		124
135	`return(0);`	125	`return(0);`
136	`}`	126	`}`
137		127
138		128
139	`static void db_rewind(struct file *db) {`	129	`static void db_rewind(struct file *db) {`
140	`if (db->cursor == NULL) return;`	130	`if (db->cursor == NULL) return;`
141	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	131	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
-		132	`db->curline = 0;`
142	`}`	133	`}`
143		134
144		135
145	`static void load_colorscheme(void) {`	136	`static void load_colorscheme(void) {`
146	`scheme[COL_TXT] = 0x17;`	137	`scheme[COL_TXT] = 0x17;`
147	`scheme[COL_STATUSBAR1] = 0x70;`	138	`scheme[COL_STATUSBAR1] = 0x70;`
148	`scheme[COL_STATUSBAR2] = 0x78;`	139	`scheme[COL_STATUSBAR2] = 0x78;`
149	`scheme[COL_SCROLLBAR] = 0x70;`	140	`scheme[COL_SCROLLBAR] = 0x70;`
150	`scheme[COL_MSG] = 0xf0;`	141	`scheme[COL_MSG] = 0xf0;`
151	`scheme[COL_ERR] = 0x4f;`	142	`scheme[COL_ERR] = 0x4f;`
152	`}`	143	`}`
153		144
154		145
155	`static void ui_basic(const struct file *db) {`	146	`static void ui_basic(const struct file *db) {`
156	`unsigned char i;`	-
157	`const char s = svarlang_strid(0); / HELP */`	147	`const char s = svarlang_strid(0); / HELP */`
158	`unsigned char helpcol = screenw - (strlen(s) + 4);`	148	`unsigned char helpcol = screenw - (strlen(s) + 4);`
159		149
160	`/* fill status bar with background */`	150	`/* fill status bar with background */`
161	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`	151	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`
162		152
163	`/* filename */`	153	`/* filename */`
164	`if (db->fname[0] == 0) {`	154	`if (db->fname[0] == 0) {`
165	`mdr_cout_str(screenh - 1, 0, svarlang_str(0, 1), scheme[COL_STATUSBAR1], screenw);`	155	`mdr_cout_str(screenh - 1, 0, svarlang_str(0, 1), scheme[COL_STATUSBAR1], screenw);`
166	`} else {`	156	`} else {`
167	`mdr_cout_str(screenh - 1, 0, db->fname, scheme[COL_STATUSBAR1], screenw);`	157	`mdr_cout_str(screenh - 1, 0, db->fname, scheme[COL_STATUSBAR1], screenw);`
168	`}`	158	`}`
169		159
170	`/* eol type */`	160	`/* eol type */`
171	`if (db->lfonly) {`	161	`if (db->lfonly) {`
172	`mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);`	162	`mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);`
173	`} else {`	163	`} else {`
174	`mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);`	164	`mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);`
175	`}`	165	`}`
176		166
177	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	167	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
178	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`	168	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`
179		-
180	`/* scroll bar */`	-
181	`for (i = 0; i < (screenh - 1); i++) {`	-
182	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	-
183	`}`	-
184	`}`	169	`}`
185		170
186		171
187	`static void ui_msg(const char *msg, unsigned char attr) {`	172	`static void ui_msg(const char *msg, unsigned char attr) {`
188	`unsigned short x, y, msglen, i;`	173	`unsigned short x, y, msglen, i;`
189	`msglen = strlen(msg);`	174	`msglen = strlen(msg);`
190	`y = (screenh - 4) >> 1;`	175	`y = (screenh - 4) >> 1;`
191	`x = (screenw - msglen - 4) >> 1;`	176	`x = (screenw - msglen - 4) >> 1;`
192	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`	177	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`
193	`mdr_cout_str(y+1, x+1, msg, attr, msglen);`	178	`mdr_cout_str(y+1, x+1, msg, attr, msglen);`
194		179
195	`if (uidirty.from > y) uidirty.from = y;`	180	`if (uidirty.from > y) uidirty.from = y;`
196	`if (uidirty.to < y+2) uidirty.to = y+2;`	181	`if (uidirty.to < y+2) uidirty.to = y+2;`
197	`}`	182	`}`
198		183
199		184
200	`static void ui_help(void) {`	185	`static void ui_help(void) {`
201	`#define MAXLINLEN 35`	186	`#define MAXLINLEN 35`
202	`unsigned short i, offset;`	187	`unsigned short i, offset;`
203	`offset = (screenw - MAXLINLEN + 2) >> 1;`	188	`offset = (screenw - MAXLINLEN + 2) >> 1;`
204	`mdr_cout_cursor_hide();`	189	`mdr_cout_cursor_hide();`
205	`for (i = 2; i <= 15; i++) {`	190	`for (i = 2; i <= 15; i++) {`
206	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);`	191	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);`
207	`}`	192	`}`
208		193
209	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`	194	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`
210	`for (i = 0; i <= 4; i++) {`	195	`for (i = 0; i <= 4; i++) {`
211	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`	196	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`
212	`}`	197	`}`
213	`mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`	198	`mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`
214		199
215	`/* Press any key */`	200	`/* Press any key */`
216	`mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`	201	`mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`
217		202
218	`keyb_getkey();`	203	`keyb_getkey();`
219	`mdr_cout_cursor_show();`	204	`mdr_cout_cursor_show();`
220	`#undef MAXLINLEN`	205	`#undef MAXLINLEN`
221	`}`	206	`}`
222		207
223		208
224	`static void ui_refresh(const struct file *db) {`	209	`static void ui_refresh(const struct file *db) {`
225	`unsigned char x;`	210	`unsigned char x;`
226	`const struct line far *l;`	211	`const struct line far *l;`
227	`unsigned char y = db->cursorposy;`	212	`unsigned char y = db->cursorposy;`
228		213
229	`#ifdef DBG_REFRESH`	214	`#ifdef DBG_REFRESH`
230	`static char m = 'a';`	215	`static char m = 'a';`
231	`m++;`	216	`m++;`
232	`if (m > 'z') m = 'a';`	217	`if (m > 'z') m = 'a';`
233	`#endif`	218	`#endif`
234		219
235	`/* rewind cursor line to first line that needs redrawing */`	220	`/* rewind cursor line to first line that needs redrawing */`
236	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`	221	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`
237		222
238	`/* iterate over lines and redraw whatever needs to be redrawn */`	223	`/* iterate over lines and redraw whatever needs to be redrawn */`
239	`for (; l != NULL; l = l->next, y++) {`	224	`for (; l != NULL; l = l->next, y++) {`
240		225
241	`/* skip lines that do not need to be refreshed */`	226	`/* skip lines that do not need to be refreshed */`
242	`if (y < uidirty.from) continue;`	227	`if (y < uidirty.from) continue;`
243	`if (y > uidirty.to) break;`	228	`if (y > uidirty.to) break;`
244		229
245	`x = 0;`	230	`x = 0;`
246	`if (db->xoffset < l->len) {`	231	`if (db->xoffset < l->len) {`
247	`unsigned char i, limit;`	232	`unsigned char i, limit;`
248	`if (l->len - db->xoffset < screenw) {`	233	`if (l->len - db->xoffset < screenw) {`
249	`limit = l->len;`	234	`limit = l->len;`
250	`} else {`	235	`} else {`
251	`limit = db->xoffset + screenw - 1;`	236	`limit = db->xoffset + screenw - 1;`
252	`}`	237	`}`
253	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`	238	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`
254	`}`	239	`}`
255		240
256	`/* write empty spaces until end of line */`	241	`/* write empty spaces until end of line */`
257	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`	242	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`
258		243
259	`#ifdef DBG_REFRESH`	244	`#ifdef DBG_REFRESH`
260	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	245	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
261	`#endif`	246	`#endif`
262		247
263	`if (y == screenh - 2) break;`	248	`if (y == screenh - 2) break;`
264	`}`	249	`}`
265		250
266	`/* fill all lines below if empty (and they need to be redrawn) */`	251	`/* fill all lines below if empty (and they need to be redrawn) */`
267	`if (l == NULL) {`	252	`if (l == NULL) {`
268	`while ((y < screenh - 1) && (y < uidirty.to)) {`	253	`while ((y < screenh - 1) && (y < uidirty.to)) {`
269	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`	254	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`
270	`}`	255	`}`
271	`}`	256	`}`
-		257
-		258	`/* scroll bar */`
-		259	`for (y = 0; y < (screenh - 1); y++) {`
-		260	`mdr_cout_char(y, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
-		261	`}`
-		262
-		263	`/* scroll cursor */`
-		264	`if (db->totlines >= screenh) {`
-		265	`unsigned short topline = db->curline - db->cursorposy;`
-		266	`unsigned short col;`
-		267	`unsigned short totlines = db->totlines - screenh + 1;`
-		268	`if (db->totlines - screenh > screenh) {`
-		269	`col = topline / (totlines / (screenh - 1));`
-		270	`} else {`
-		271	`col = topline * (screenh - 1) / totlines;`
-		272	`}`
-		273	`if (col >= screenh - 1) col = screenh - 2;`
-		274	`mdr_cout_char(col, screenw - 1, ' ', scheme[COL_SCROLLBAR]);`
-		275	`}`
272	`}`	276	`}`
273		277
274		278
275	`static void check_cursor_not_after_eol(struct file *db) {`	279	`static void check_cursor_not_after_eol(struct file *db) {`
276	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	280	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
277		281
278	`if (db->cursor->len < db->xoffset) {`	282	`if (db->cursor->len < db->xoffset) {`
279	`db->cursorposx = 0;`	283	`db->cursorposx = 0;`
280	`db->xoffset = db->cursor->len;`	284	`db->xoffset = db->cursor->len;`
281	`uidirty.from = 0;`	285	`uidirty.from = 0;`
282	`uidirty.to = 0xff;`	286	`uidirty.to = 0xff;`
283	`} else {`	287	`} else {`
284	`db->cursorposx = db->cursor->len - db->xoffset;`	288	`db->cursorposx = db->cursor->len - db->xoffset;`
285	`}`	289	`}`
286	`}`	290	`}`
287		291
288		292
289	`static void cursor_up(struct file *db) {`	293	`static void cursor_up(struct file *db) {`
290	`if (db->cursor->prev != NULL) {`	294	`if (db->cursor->prev != NULL) {`
-		295	`db->curline -= 1;`
291	`db->cursor = db->cursor->prev;`	296	`db->cursor = db->cursor->prev;`
292	`if (db->cursorposy == 0) {`	297	`if (db->cursorposy == 0) {`
293	`uidirty.from = 0;`	298	`uidirty.from = 0;`
294	`uidirty.to = 0xff;`	299	`uidirty.to = 0xff;`
295	`} else {`	300	`} else {`
296	`db->cursorposy -= 1;`	301	`db->cursorposy -= 1;`
297	`}`	302	`}`
298	`}`	303	`}`
299	`}`	304	`}`
300		305
301		306
302	`static void cursor_eol(struct file *db) {`	307	`static void cursor_eol(struct file *db) {`
303	`/* adjust xoffset to make sure eol is visible on screen */`	308	`/* adjust xoffset to make sure eol is visible on screen */`
304	`if (db->xoffset > db->cursor->len) {`	309	`if (db->xoffset > db->cursor->len) {`
305	`db->xoffset = db->cursor->len - 1;`	310	`db->xoffset = db->cursor->len - 1;`
306	`uidirty.from = 0;`	311	`uidirty.from = 0;`
307	`uidirty.to = 0xff;`	312	`uidirty.to = 0xff;`
308	`}`	313	`}`
309		314
310	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	315	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
311	`db->xoffset = db->cursor->len - screenw + 2;`	316	`db->xoffset = db->cursor->len - screenw + 2;`
312	`uidirty.from = 0;`	317	`uidirty.from = 0;`
313	`uidirty.to = 0xff;`	318	`uidirty.to = 0xff;`
314	`}`	319	`}`
315	`db->cursorposx = db->cursor->len - db->xoffset;`	320	`db->cursorposx = db->cursor->len - db->xoffset;`
316	`}`	321	`}`
317		322
318		323
319	`static void cursor_down(struct file *db) {`	324	`static void cursor_down(struct file *db) {`
320	`if (db->cursor->next != NULL) {`	325	`if (db->cursor->next != NULL) {`
-		326	`db->curline += 1;`
321	`db->cursor = db->cursor->next;`	327	`db->cursor = db->cursor->next;`
322	`if (db->cursorposy < screenh - 2) {`	328	`if (db->cursorposy < screenh - 2) {`
323	`db->cursorposy += 1;`	329	`db->cursorposy += 1;`
324	`} else {`	330	`} else {`
325	`uidirty.from = 0;`	331	`uidirty.from = 0;`
326	`uidirty.to = 0xff;`	332	`uidirty.to = 0xff;`
327	`}`	333	`}`
328	`}`	334	`}`
329	`}`	335	`}`
330		336
331		337
332	`static void cursor_left(struct file *db) {`	338	`static void cursor_left(struct file *db) {`
333	`if (db->cursorposx > 0) {`	339	`if (db->cursorposx > 0) {`
334	`db->cursorposx -= 1;`	340	`db->cursorposx -= 1;`
335	`} else if (db->xoffset > 0) {`	341	`} else if (db->xoffset > 0) {`
336	`db->xoffset -= 1;`	342	`db->xoffset -= 1;`
337	`uidirty.from = 0;`	343	`uidirty.from = 0;`
338	`uidirty.to = 0xff;`	344	`uidirty.to = 0xff;`
339	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	345	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
340	`cursor_up(db);`	346	`cursor_up(db);`
341	`cursor_eol(db);`	347	`cursor_eol(db);`
342	`}`	348	`}`
343	`}`	349	`}`
344		350
345		351
346	`static void cursor_home(struct file *db) {`	352	`static void cursor_home(struct file *db) {`
347	`db->cursorposx = 0;`	353	`db->cursorposx = 0;`
348	`if (db->xoffset != 0) {`	354	`if (db->xoffset != 0) {`
349	`db->xoffset = 0;`	355	`db->xoffset = 0;`
350	`uidirty.from = 0;`	356	`uidirty.from = 0;`
351	`uidirty.to = 0xff;`	357	`uidirty.to = 0xff;`
352	`}`	358	`}`
353	`}`	359	`}`
354		360
355		361
356	`static void cursor_right(struct file *db) {`	362	`static void cursor_right(struct file *db) {`
357	`if (db->cursor->len > db->xoffset + db->cursorposx) {`	363	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
358	`if (db->cursorposx < screenw - 2) {`	364	`if (db->cursorposx < screenw - 2) {`
359	`db->cursorposx += 1;`	365	`db->cursorposx += 1;`
360	`} else {`	366	`} else {`
361	`db->xoffset += 1;`	367	`db->xoffset += 1;`
362	`uidirty.from = 0;`	368	`uidirty.from = 0;`
363	`uidirty.to = 0xff;`	369	`uidirty.to = 0xff;`
364	`}`	370	`}`
365	`} else {`	371	`} else {`
366	`cursor_down(db);`	372	`cursor_down(db);`
367	`cursor_home(db);`	373	`cursor_home(db);`
368	`}`	374	`}`
369	`}`	375	`}`
370		376
371		377
372	`static void del(struct file *db) {`	378	`static void del(struct file *db) {`
373	`if (db->cursorposx + db->xoffset < db->cursor->len) {`	379	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
374	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`	380	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`
375	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	381	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
376	`uidirty.from = db->cursorposy;`	382	`uidirty.from = db->cursorposy;`
377	`uidirty.to = db->cursorposy;`	383	`uidirty.to = db->cursorposy;`
378	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	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) */`
379	`struct line far *nextline = db->cursor->next;`	385	`struct line far *nextline = db->cursor->next;`
380	`if (db->cursor->next->len > 0) {`	386	`if (db->cursor->next->len > 0) {`
381	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	387	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
382	`if (newptr != NULL) {`	388	`if (newptr != NULL) {`
383	`db->cursor = newptr;`	389	`db->cursor = newptr;`
384	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	390	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
385	`db->cursor->len += db->cursor->next->len;`	391	`db->cursor->len += db->cursor->next->len;`
386	`}`	392	`}`
387	`}`	393	`}`
388	`db->cursor->next = db->cursor->next->next;`	394	`db->cursor->next = db->cursor->next->next;`
389	`db->cursor->next->prev = db->cursor;`	395	`db->cursor->next->prev = db->cursor;`
390	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	396	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
391	`_ffree(nextline);`	397	`_ffree(nextline);`
392	`uidirty.from = db->cursorposy;`	398	`uidirty.from = db->cursorposy;`
393	`uidirty.to = 0xff;`	399	`uidirty.to = 0xff;`
-		400	`db->totlines -= 1;`
394	`}`	401	`}`
395	`}`	402	`}`
396		403
397		404
398	`static void bkspc(struct file *db) {`	405	`static void bkspc(struct file *db) {`
399		406
400	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	407	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
401	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	408	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
402		409
403	`cursor_left(db);`	410	`cursor_left(db);`
404	`del(db);`	411	`del(db);`
405	`}`	412	`}`
406		413
407		414
408	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	415	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
409	`* of argc and argv, saves some 330 bytes of binary size */`	416	`* of argc and argv, saves some 330 bytes of binary size */`
410	`static char *parseargv(void) {`	417	`static char *parseargv(void) {`
411	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	418	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
412	`unsigned char count = 0;`	419	`unsigned char count = 0;`
413	`char *argv[4];`	420	`char *argv[4];`
414		421
415	`while (count < 4) {`	422	`while (count < 4) {`
416	`/* jump to nearest arg */`	423	`/* jump to nearest arg */`
417	`while (*tail == ' ') {`	424	`while (*tail == ' ') {`
418	`*tail = 0;`	425	`*tail = 0;`
419	`tail++;`	426	`tail++;`
420	`}`	427	`}`
421		428
422	`if (*tail == '\r') {`	429	`if (*tail == '\r') {`
423	`*tail = 0;`	430	`*tail = 0;`
424	`break;`	431	`break;`
425	`}`	432	`}`
426		433
427	`argv[count++] = tail;`	434	`argv[count++] = tail;`
428		435
429	`/* jump to next delimiter */`	436	`/* jump to next delimiter */`
430	`while ((tail != ' ') && (tail != '\r')) tail++;`	437	`while ((tail != ' ') && (tail != '\r')) tail++;`
431	`}`	438	`}`
432		439
433	`/* check args now */`	440	`/* check args now */`
434	`if (count == 0) return("");`	441	`if (count == 0) return("");`
435		442
436	`return(argv[0]);`	443	`return(argv[0]);`
437	`}`	444	`}`
438		445
439		446
440	`static struct file loadfile(const char fname) {`	447	`static struct file loadfile(const char fname) {`
441	`char buff[512]; /* read one entire sector at a time (faster) */`	448	`char buff[512]; /* read one entire sector at a time (faster) */`
442	`char *buffptr;`	449	`char *buffptr;`
443	`unsigned int len, llen;`	450	`unsigned int len, llen;`
444	`int fd;`	451	`int fd;`
445	`unsigned char eolfound;`	452	`unsigned char eolfound;`
446	`struct file *db;`	453	`struct file *db;`
447		454
448	`len = strlen(fname) + 1;`	455	`len = strlen(fname) + 1;`
449	`db = calloc(1, sizeof(struct file) + len);`	456	`db = calloc(1, sizeof(struct file) + len);`
450	`if (db == NULL) return(NULL);`	457	`if (db == NULL) return(NULL);`
451	`memcpy(db->fname, fname, len);`	458	`memcpy(db->fname, fname, len);`
452		459
453	`if (*fname == 0) goto SKIPLOADING;`	460	`if (*fname == 0) goto SKIPLOADING;`
454		461
455	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	462	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
456	`mdr_coutraw_puts("Failed to open file:");`	463	`mdr_coutraw_puts("Failed to open file:");`
457	`mdr_coutraw_puts(fname);`	464	`mdr_coutraw_puts(fname);`
458	`free(db);`	465	`free(db);`
459	`return(NULL);`	466	`return(NULL);`
460	`}`	467	`}`
461		468
462	`db->lfonly = 1;`	469	`db->lfonly = 1;`
463		470
464	`/* start by adding an empty line */`	471	`/* start by adding an empty line */`
465	`if (line_add(db, "") != 0) {`	472	`if (line_add(db, NULL, 0) != 0) {`
466	`/* TODO ERROR HANDLING */`	473	`/* TODO ERROR HANDLING */`
467	`}`	474	`}`
468		475
469	`for (eolfound = 0;;) {`	476	`for (eolfound = 0;;) {`
470	`unsigned short consumedbytes;`	477	`unsigned short consumedbytes;`
471		478
472	`if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) \|\| (len == 0)) break;`	479	`if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) \|\| (len == 0)) break;`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1425 – Rev 1327 → 1328