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 union {
static struct {
    unsigned char from;
    unsigned char to;
//  };
//  unsigned short fromto;
} uidirty = {0, 0xff}; /* make sure to redraw entire UI at first run */
//} uidirty = {0xff, 0};
 
#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;
  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 dvance cursor
 * returns non-zero on error */
static int line_add(struct file *db, const char far *line) {
  unsigned short slen;
  struct line far *l;
 
  /* slen = strlen(line) (but for far pointer) */
  for (slen = 0; line[slen] != 0; slen++);
 
  /* trim out CR/LF line endings */
  if ((slen >= 2) && (line[slen - 2] == '\r')) {
    slen -= 2;
  } else if ((slen >= 1) && (line[slen - 1] == '\n')) {
    slen--;
  }
 
  l = _fcalloc(1, sizeof(struct line) + slen + 1);
  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;
 
  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;
}
 
 
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) {
  unsigned char i;
  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);
 
  /* scroll bar */
  for (i = 0; i < (screenh - 1); i++) {
    mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);
  }
}
 
 
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);
    }
  }
}
 
 
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->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->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;
  }
}
 
 
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, "") != 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, "") != 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, "");
    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;
    }
 
    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 */
      /* add a new line */
      if (line_add(db, db->cursor->payload + db->xoffset + db->cursorposx) == 0) {
        /* trim the line above */
        db->cursor->prev->len = db->xoffset + db->cursorposx;
        db->cursor->prev->payload[db->cursor->prev->len] = 0;
        /* move cursor to the (new) line below */
        db->cursorposx = 0;
        if (db->cursorposy < screenh - 2) {
          uidirty.from = db->cursorposy;
          db->cursorposy++;
        } else {
          uidirty.from = 0;
        }
        uidirty.to = 0xff;
      } 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 1326	Rev 1327
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	`static unsigned char screenw, screenh;`	53	`static unsigned char screenw, screenh;`
53		54
-		55	`//static union {`
-		56	`static struct {`
-		57	`unsigned char from;`
-		58	`unsigned char to;`
-		59	`// };`
-		60	`// unsigned short fromto;`
-		61	`} uidirty = {0, 0xff}; /* make sure to redraw entire UI at first run */`
-		62	`//} uidirty = {0xff, 0};`
-		63
54	`#define SCROLL_CURSOR 0xB1`	64	`#define SCROLL_CURSOR 0xB1`
55		65
56	`struct line {`	66	`struct line {`
57	`struct line far *prev;`	67	`struct line far *prev;`
58	`struct line far *next;`	68	`struct line far *next;`
59	`unsigned short len;`	69	`unsigned short len;`
60	`char payload[1];`	70	`char payload[1];`
61	`};`	71	`};`
62		72
63	`struct file {`	73	`struct file {`
64	`int fd;`	74	`int fd;`
65	`struct line far *cursor;`	75	`struct line far *cursor;`
66	`unsigned short xoffset;`	76	`unsigned short xoffset;`
67	`unsigned char cursorposx;`	77	`unsigned char cursorposx;`
68	`unsigned char cursorposy;`	78	`unsigned char cursorposy;`
69	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`	79	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`
70	`char fname[1]; /* dynamically sized */`	80	`char fname[1]; /* dynamically sized */`
71	`};`	81	`};`
72		82
73		83
74	`/*****************************************************************************`	84	`/*****************************************************************************`
75	`* functions *`	85	`* functions *`
76	`*****************************************************************************/`	86	`*****************************************************************************/`
77		87
78	`/* adds a new line at cursor position into file linked list and dvance cursor`	88	`/* adds a new line at cursor position into file linked list and dvance cursor`
79	`* returns non-zero on error */`	89	`* returns non-zero on error */`
80	`static int line_add(struct file db, const char far line) {`	90	`static int line_add(struct file db, const char far line) {`
81	`unsigned short slen;`	91	`unsigned short slen;`
82	`struct line far *l;`	92	`struct line far *l;`
83		93
84	`/* slen = strlen(line) (but for far pointer) */`	94	`/* slen = strlen(line) (but for far pointer) */`
85	`for (slen = 0; line[slen] != 0; slen++);`	95	`for (slen = 0; line[slen] != 0; slen++);`
86		96
87	`/* trim out CR/LF line endings */`	97	`/* trim out CR/LF line endings */`
88	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`	98	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`
89	`slen -= 2;`	99	`slen -= 2;`
90	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`	100	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`
91	`slen--;`	101	`slen--;`
92	`}`	102	`}`
93		103
94	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`	104	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`
95	`if (l == NULL) return(-1);`	105	`if (l == NULL) return(-1);`
96		106
97	`l->prev = db->cursor;`	107	`l->prev = db->cursor;`
98	`if (db->cursor) {`	108	`if (db->cursor) {`
99	`l->next = db->cursor->next;`	109	`l->next = db->cursor->next;`
100	`db->cursor->next = l;`	110	`db->cursor->next = l;`
101	`l->next->prev = l;`	111	`l->next->prev = l;`
102	`}`	112	`}`
103	`db->cursor = l;`	113	`db->cursor = l;`
104	`_fmemcpy(l->payload, line, slen);`	114	`_fmemcpy(l->payload, line, slen);`
105	`l->len = slen;`	115	`l->len = slen;`
106		116
107	`return(0);`	117	`return(0);`
108	`}`	118	`}`
109		119
110		120
111	`/* append a nul-terminated string to line at cursor position */`	121	`/* 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) {`	122	`static int line_append(struct file f, const char far buf, unsigned short len) {`
113	`struct line far *n;`	123	`struct line far *n;`
114	`if (sizeof(struct line) + f->cursor->len + len < len) return(-1); /* overflow check */`	124	`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);`	125	`n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);`
116	`if (n == NULL) return(-1);`	126	`if (n == NULL) return(-1);`
117	`f->cursor = n;`	127	`f->cursor = n;`
118	`_fmemcpy(f->cursor->payload + f->cursor->len, buf, len);`	128	`_fmemcpy(f->cursor->payload + f->cursor->len, buf, len);`
119	`f->cursor->len += len;`	129	`f->cursor->len += len;`
120		130
121	`/* rewire the linked list */`	131	`/* rewire the linked list */`
122	`if (f->cursor->next) f->cursor->next->prev = f->cursor;`	132	`if (f->cursor->next) f->cursor->next->prev = f->cursor;`
123	`if (f->cursor->prev) f->cursor->prev->next = f->cursor;`	133	`if (f->cursor->prev) f->cursor->prev->next = f->cursor;`
124		134
125	`return(0);`	135	`return(0);`
126	`}`	136	`}`
127		137
128		138
129	`static void db_rewind(struct file *db) {`	139	`static void db_rewind(struct file *db) {`
130	`if (db->cursor == NULL) return;`	140	`if (db->cursor == NULL) return;`
131	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	141	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
132	`}`	142	`}`
133		143
134		144
135	`static void load_colorscheme(void) {`	145	`static void load_colorscheme(void) {`
136	`scheme[COL_TXT] = 0x17;`	146	`scheme[COL_TXT] = 0x17;`
137	`scheme[COL_STATUSBAR1] = 0x70;`	147	`scheme[COL_STATUSBAR1] = 0x70;`
138	`scheme[COL_STATUSBAR2] = 0x78;`	148	`scheme[COL_STATUSBAR2] = 0x78;`
139	`scheme[COL_SCROLLBAR] = 0x70;`	149	`scheme[COL_SCROLLBAR] = 0x70;`
140	`scheme[COL_MSG] = 0xf0;`	150	`scheme[COL_MSG] = 0xf0;`
141	`scheme[COL_ERR] = 0x4f;`	151	`scheme[COL_ERR] = 0x4f;`
142	`}`	152	`}`
143		153
144		154
145	`static void ui_basic(const struct file *db) {`	155	`static void ui_basic(const struct file *db) {`
146	`unsigned char i;`	156	`unsigned char i;`
147	`const char s = svarlang_strid(0); / HELP */`	157	`const char s = svarlang_strid(0); / HELP */`
148	`unsigned char helpcol = screenw - (strlen(s) + 4);`	158	`unsigned char helpcol = screenw - (strlen(s) + 4);`
149		159
150	`/* fill status bar with background */`	160	`/* fill status bar with background */`
151	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`	161	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`
152		162
153	`/* filename */`	163	`/* filename */`
154	`if (db->fname[0] == 0) {`	164	`if (db->fname[0] == 0) {`
155	`mdr_cout_str(screenh - 1, 0, svarlang_str(0, 1), scheme[COL_STATUSBAR1], screenw);`	165	`mdr_cout_str(screenh - 1, 0, svarlang_str(0, 1), scheme[COL_STATUSBAR1], screenw);`
156	`} else {`	166	`} else {`
157	`mdr_cout_str(screenh - 1, 0, db->fname, scheme[COL_STATUSBAR1], screenw);`	167	`mdr_cout_str(screenh - 1, 0, db->fname, scheme[COL_STATUSBAR1], screenw);`
158	`}`	168	`}`
159		169
160	`/* eol type */`	170	`/* eol type */`
161	`if (db->lfonly) {`	171	`if (db->lfonly) {`
162	`mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);`	172	`mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);`
163	`} else {`	173	`} else {`
164	`mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);`	174	`mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);`
165	`}`	175	`}`
166		176
167	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	177	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
168	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`	178	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`
169		179
170	`/* scroll bar */`	180	`/* scroll bar */`
171	`for (i = 0; i < (screenh - 1); i++) {`	181	`for (i = 0; i < (screenh - 1); i++) {`
172	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	182	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
173	`}`	183	`}`
174	`}`	184	`}`
175		185
176		186
177	`static void ui_msg(const char msg, unsigned char uidirtyfrom, unsigned char *uidirtyto, unsigned char attr) {`	187	`static void ui_msg(const char *msg, unsigned char attr) {`
178	`unsigned short x, y, msglen, i;`	188	`unsigned short x, y, msglen, i;`
179	`msglen = strlen(msg);`	189	`msglen = strlen(msg);`
180	`y = (screenh - 4) >> 1;`	190	`y = (screenh - 4) >> 1;`
181	`x = (screenw - msglen - 4) >> 1;`	191	`x = (screenw - msglen - 4) >> 1;`
182	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`	192	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`
183	`mdr_cout_str(y+1, x+1, msg, attr, msglen);`	193	`mdr_cout_str(y+1, x+1, msg, attr, msglen);`
184		194
185	`if (uidirtyfrom > y) uidirtyfrom = y;`	195	`if (uidirty.from > y) uidirty.from = y;`
186	`if (uidirtyto < y+2) uidirtyto = y+2;`	196	`if (uidirty.to < y+2) uidirty.to = y+2;`
187	`}`	197	`}`
188		198
189		199
190	`static void ui_help(void) {`	200	`static void ui_help(void) {`
191	`#define MAXLINLEN 35`	201	`#define MAXLINLEN 35`
192	`unsigned short i, offset;`	202	`unsigned short i, offset;`
193	`offset = (screenw - MAXLINLEN + 2) >> 1;`	203	`offset = (screenw - MAXLINLEN + 2) >> 1;`
194	`mdr_cout_cursor_hide();`	204	`mdr_cout_cursor_hide();`
195	`for (i = 2; i <= 15; i++) {`	205	`for (i = 2; i <= 15; i++) {`
196	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);`	206	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);`
197	`}`	207	`}`
198		208
199	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`	209	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`
200	`for (i = 0; i <= 4; i++) {`	210	`for (i = 0; i <= 4; i++) {`
201	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`	211	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`
202	`}`	212	`}`
203	`mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`	213	`mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`
204		214
205	`/* Press any key */`	215	`/* Press any key */`
206	`mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`	216	`mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`
207		217
208	`keyb_getkey();`	218	`keyb_getkey();`
209	`mdr_cout_cursor_show();`	219	`mdr_cout_cursor_show();`
210	`#undef MAXLINLEN`	220	`#undef MAXLINLEN`
211	`}`	221	`}`
212		222
213		223
214	`static void ui_refresh(const struct file *db, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	224	`static void ui_refresh(const struct file *db) {`
215	`unsigned char x;`	225	`unsigned char x;`
216	`const struct line far *l;`	226	`const struct line far *l;`
217	`unsigned char y = db->cursorposy;`	227	`unsigned char y = db->cursorposy;`
218		228
219	`#ifdef DBG_REFRESH`	229	`#ifdef DBG_REFRESH`
220	`static char m = 'a';`	230	`static char m = 'a';`
221	`m++;`	231	`m++;`
222	`if (m > 'z') m = 'a';`	232	`if (m > 'z') m = 'a';`
223	`#endif`	233	`#endif`
224		234
225	`/* rewind cursor line to first line that needs redrawing */`	235	`/* rewind cursor line to first line that needs redrawing */`
226	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`	236	`for (l = db->cursor; y > uidirty.from; y--) l = l->prev;`
227		237
228	`/* iterate over lines and redraw whatever needs to be redrawn */`	238	`/* iterate over lines and redraw whatever needs to be redrawn */`
229	`for (; l != NULL; l = l->next, y++) {`	239	`for (; l != NULL; l = l->next, y++) {`
230		240
231	`/* skip lines that do not need to be refreshed */`	241	`/* skip lines that do not need to be refreshed */`
232	`if (y < uidirtyfrom) continue;`	242	`if (y < uidirty.from) continue;`
233	`if (y > uidirtyto) break;`	243	`if (y > uidirty.to) break;`
234		244
235	`x = 0;`	245	`x = 0;`
236	`if (db->xoffset < l->len) {`	246	`if (db->xoffset < l->len) {`
237	`unsigned char i, limit;`	247	`unsigned char i, limit;`
238	`if (l->len - db->xoffset < screenw) {`	248	`if (l->len - db->xoffset < screenw) {`
239	`limit = l->len;`	249	`limit = l->len;`
240	`} else {`	250	`} else {`
241	`limit = db->xoffset + screenw - 1;`	251	`limit = db->xoffset + screenw - 1;`
242	`}`	252	`}`
243	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`	253	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`
244	`}`	254	`}`
245		255
246	`/* write empty spaces until end of line */`	256	`/* write empty spaces until end of line */`
247	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`	257	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`
248		258
249	`#ifdef DBG_REFRESH`	259	`#ifdef DBG_REFRESH`
250	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	260	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
251	`#endif`	261	`#endif`
252		262
253	`if (y == screenh - 2) break;`	263	`if (y == screenh - 2) break;`
254	`}`	264	`}`
255		265
256	`/* fill all lines below if empty (and they need to be redrawn) */`	266	`/* fill all lines below if empty (and they need to be redrawn) */`
257	`if (l == NULL) {`	267	`if (l == NULL) {`
258	`while ((y < screenh - 1) && (y < uidirtyto)) {`	268	`while ((y < screenh - 1) && (y < uidirty.to)) {`
259	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`	269	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`
260	`}`	270	`}`
261	`}`	271	`}`
262	`}`	272	`}`
263		273
264		274
265	`static void check_cursor_not_after_eol(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	275	`static void check_cursor_not_after_eol(struct file *db) {`
266	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	276	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
267		277
268	`if (db->cursor->len < db->xoffset) {`	278	`if (db->cursor->len < db->xoffset) {`
269	`db->cursorposx = 0;`	279	`db->cursorposx = 0;`
270	`db->xoffset = db->cursor->len;`	280	`db->xoffset = db->cursor->len;`
271	`*uidirtyfrom = 0;`	281	`uidirty.from = 0;`
272	`*uidirtyto = 0xff;`	282	`uidirty.to = 0xff;`
273	`} else {`	283	`} else {`
274	`db->cursorposx = db->cursor->len - db->xoffset;`	284	`db->cursorposx = db->cursor->len - db->xoffset;`
275	`}`	285	`}`
276	`}`	286	`}`
277		287
278		288
279	`static void cursor_up(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	289	`static void cursor_up(struct file *db) {`
280	`if (db->cursor->prev != NULL) {`	290	`if (db->cursor->prev != NULL) {`
281	`db->cursor = db->cursor->prev;`	291	`db->cursor = db->cursor->prev;`
282	`if (db->cursorposy == 0) {`	292	`if (db->cursorposy == 0) {`
283	`*uidirtyfrom = 0;`	293	`uidirty.from = 0;`
284	`*uidirtyto = 0xff;`	294	`uidirty.to = 0xff;`
285	`} else {`	295	`} else {`
286	`db->cursorposy -= 1;`	296	`db->cursorposy -= 1;`
287	`}`	297	`}`
288	`}`	298	`}`
289	`}`	299	`}`
290		300
291		301
292	`static void cursor_eol(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	302	`static void cursor_eol(struct file *db) {`
293	`/* adjust xoffset to make sure eol is visible on screen */`	303	`/* adjust xoffset to make sure eol is visible on screen */`
294	`if (db->xoffset > db->cursor->len) {`	304	`if (db->xoffset > db->cursor->len) {`
295	`db->xoffset = db->cursor->len - 1;`	305	`db->xoffset = db->cursor->len - 1;`
296	`*uidirtyfrom = 0;`	306	`uidirty.from = 0;`
297	`*uidirtyto = 0xff;`	307	`uidirty.to = 0xff;`
298	`}`	308	`}`
299		309
300	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	310	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
301	`db->xoffset = db->cursor->len - screenw + 2;`	311	`db->xoffset = db->cursor->len - screenw + 2;`
302	`*uidirtyfrom = 0;`	312	`uidirty.from = 0;`
303	`*uidirtyto = 0xff;`	313	`uidirty.to = 0xff;`
304	`}`	314	`}`
305	`db->cursorposx = db->cursor->len - db->xoffset;`	315	`db->cursorposx = db->cursor->len - db->xoffset;`
306	`}`	316	`}`
307		317
308		318
309	`static void cursor_down(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	319	`static void cursor_down(struct file *db) {`
310	`if (db->cursor->next != NULL) {`	320	`if (db->cursor->next != NULL) {`
311	`db->cursor = db->cursor->next;`	321	`db->cursor = db->cursor->next;`
312	`if (db->cursorposy < screenh - 2) {`	322	`if (db->cursorposy < screenh - 2) {`
313	`db->cursorposy += 1;`	323	`db->cursorposy += 1;`
314	`} else {`	324	`} else {`
315	`*uidirtyfrom = 0;`	325	`uidirty.from = 0;`
316	`*uidirtyto = 0xff;`	326	`uidirty.to = 0xff;`
317	`}`	327	`}`
318	`}`	328	`}`
319	`}`	329	`}`
320		330
321		331
322	`static void cursor_left(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	332	`static void cursor_left(struct file *db) {`
323	`if (db->cursorposx > 0) {`	333	`if (db->cursorposx > 0) {`
324	`db->cursorposx -= 1;`	334	`db->cursorposx -= 1;`
325	`} else if (db->xoffset > 0) {`	335	`} else if (db->xoffset > 0) {`
326	`db->xoffset -= 1;`	336	`db->xoffset -= 1;`
327	`*uidirtyfrom = 0;`	337	`uidirty.from = 0;`
328	`*uidirtyto = 0xff;`	338	`uidirty.to = 0xff;`
329	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	339	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
330	`cursor_up(db, uidirtyfrom, uidirtyto);`	340	`cursor_up(db);`
331	`cursor_eol(db, uidirtyfrom, uidirtyto);`	341	`cursor_eol(db);`
332	`}`	342	`}`
333	`}`	343	`}`
334		344
335		345
336	`static void cursor_home(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	346	`static void cursor_home(struct file *db) {`
337	`db->cursorposx = 0;`	347	`db->cursorposx = 0;`
338	`if (db->xoffset != 0) {`	348	`if (db->xoffset != 0) {`
339	`db->xoffset = 0;`	349	`db->xoffset = 0;`
340	`*uidirtyfrom = 0;`	350	`uidirty.from = 0;`
341	`*uidirtyto = 0xff;`	351	`uidirty.to = 0xff;`
342	`}`	352	`}`
343	`}`	353	`}`
344		354
345		355
346	`static void cursor_right(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	356	`static void cursor_right(struct file *db) {`
347	`if (db->cursor->len > db->xoffset + db->cursorposx) {`	357	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
348	`if (db->cursorposx < screenw - 2) {`	358	`if (db->cursorposx < screenw - 2) {`
349	`db->cursorposx += 1;`	359	`db->cursorposx += 1;`
350	`} else {`	360	`} else {`
351	`db->xoffset += 1;`	361	`db->xoffset += 1;`
352	`*uidirtyfrom = 0;`	362	`uidirty.from = 0;`
353	`*uidirtyto = 0xff;`	363	`uidirty.to = 0xff;`
354	`}`	364	`}`
355	`} else {`	365	`} else {`
356	`cursor_down(db, uidirtyfrom, uidirtyto);`	366	`cursor_down(db);`
357	`cursor_home(db, uidirtyfrom, uidirtyto);`	367	`cursor_home(db);`
358	`}`	368	`}`
359	`}`	369	`}`
360		370
361		371
362	`static void del(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	372	`static void del(struct file *db) {`
363	`if (db->cursorposx + db->xoffset < db->cursor->len) {`	373	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
364	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`	374	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`
365	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	375	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
366	`*uidirtyfrom = db->cursorposy;`	376	`uidirty.from = db->cursorposy;`
367	`*uidirtyto = db->cursorposy;`	377	`uidirty.to = db->cursorposy;`
368	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	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) */`
369	`struct line far *nextline = db->cursor->next;`	379	`struct line far *nextline = db->cursor->next;`
370	`if (db->cursor->next->len > 0) {`	380	`if (db->cursor->next->len > 0) {`
371	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	381	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
372	`if (newptr != NULL) {`	382	`if (newptr != NULL) {`
373	`db->cursor = newptr;`	383	`db->cursor = newptr;`
374	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	384	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
375	`db->cursor->len += db->cursor->next->len;`	385	`db->cursor->len += db->cursor->next->len;`
376	`}`	386	`}`
377	`}`	387	`}`
378	`db->cursor->next = db->cursor->next->next;`	388	`db->cursor->next = db->cursor->next->next;`
379	`db->cursor->next->prev = db->cursor;`	389	`db->cursor->next->prev = db->cursor;`
380	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	390	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
381	`_ffree(nextline);`	391	`_ffree(nextline);`
382	`*uidirtyfrom = db->cursorposy;`	392	`uidirty.from = db->cursorposy;`
383	`*uidirtyto = 0xff;`	393	`uidirty.to = 0xff;`
384	`}`	394	`}`
385	`}`	395	`}`
386		396
387		397
388	`static void bkspc(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	398	`static void bkspc(struct file *db) {`
389		399
390	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	400	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
391	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	401	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
392		402
393	`cursor_left(db, uidirtyfrom, uidirtyto);`	403	`cursor_left(db);`
394	`del(db, uidirtyfrom, uidirtyto);`	404	`del(db);`
395	`}`	405	`}`
396		406
397		407
398	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	408	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
399	`* of argc and argv, saves some 330 bytes of binary size */`	409	`* of argc and argv, saves some 330 bytes of binary size */`
400	`static char *parseargv(void) {`	410	`static char *parseargv(void) {`
401	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	411	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
402	`unsigned char count = 0;`	412	`unsigned char count = 0;`
403	`char *argv[4];`	413	`char *argv[4];`
404		414
405	`while (count < 4) {`	415	`while (count < 4) {`
406	`/* jump to nearest arg */`	416	`/* jump to nearest arg */`
407	`while (*tail == ' ') {`	417	`while (*tail == ' ') {`
408	`*tail = 0;`	418	`*tail = 0;`
409	`tail++;`	419	`tail++;`
410	`}`	420	`}`
411		421
412	`if (*tail == '\r') {`	422	`if (*tail == '\r') {`
413	`*tail = 0;`	423	`*tail = 0;`
414	`break;`	424	`break;`
415	`}`	425	`}`
416		426
417	`argv[count++] = tail;`	427	`argv[count++] = tail;`
418		428
419	`/* jump to next delimiter */`	429	`/* jump to next delimiter */`
420	`while ((tail != ' ') && (tail != '\r')) tail++;`	430	`while ((tail != ' ') && (tail != '\r')) tail++;`
421	`}`	431	`}`
422		432
423	`/* check args now */`	433	`/* check args now */`
424	`if (count == 0) return("");`	434	`if (count == 0) return("");`
425		435
426	`return(argv[0]);`	436	`return(argv[0]);`
427	`}`	437	`}`
428		438
429		439
430	`static struct file loadfile(const char fname) {`	440	`static struct file loadfile(const char fname) {`
431	`char buff[512]; /* read one entire sector at a time (faster) */`	441	`char buff[512]; /* read one entire sector at a time (faster) */`
432	`char *buffptr;`	442	`char *buffptr;`
433	`unsigned int len, llen;`	443	`unsigned int len, llen;`
434	`int fd;`	444	`int fd;`
435	`unsigned char eolfound;`	445	`unsigned char eolfound;`
436	`struct file *db;`	446	`struct file *db;`
437		447
438	`len = strlen(fname) + 1;`	448	`len = strlen(fname) + 1;`
439	`db = calloc(1, sizeof(struct file) + len);`	449	`db = calloc(1, sizeof(struct file) + len);`
440	`if (db == NULL) return(NULL);`	450	`if (db == NULL) return(NULL);`
441	`memcpy(db->fname, fname, len);`	451	`memcpy(db->fname, fname, len);`
442		452
443	`if (*fname == 0) goto SKIPLOADING;`	453	`if (*fname == 0) goto SKIPLOADING;`
444		454
445	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	455	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
446	`mdr_coutraw_puts("Failed to open file:");`	456	`mdr_coutraw_puts("Failed to open file:");`
447	`mdr_coutraw_puts(fname);`	457	`mdr_coutraw_puts(fname);`
448	`free(db);`	458	`free(db);`
449	`return(NULL);`	459	`return(NULL);`
450	`}`	460	`}`
451		461
452	`db->lfonly = 1;`	462	`db->lfonly = 1;`
453		463
454	`/* start by adding an empty line */`	464	`/* start by adding an empty line */`
455	`if (line_add(db, "") != 0) {`	465	`if (line_add(db, "") != 0) {`
456	`/* TODO ERROR HANDLING */`	466	`/* TODO ERROR HANDLING */`
457	`}`	467	`}`
458		468
459	`for (eolfound = 0;;) {`	469	`for (eolfound = 0;;) {`
460	`unsigned short consumedbytes;`	470	`unsigned short consumedbytes;`
461		471
462	`if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) \|\| (len == 0)) break;`	472	`if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) \|\| (len == 0)) break;`
463	`buffptr = buff;`	473	`buffptr = buff;`
464		474
465	`FINDLINE:`	475	`FINDLINE:`
466		476
467	`/* look for nearest \n */`	477	`/* look for nearest \n */`
468	`for (consumedbytes = 0;; consumedbytes++) {`	478	`for (consumedbytes = 0;; consumedbytes++) {`
469	`if (consumedbytes == len) {`	479	`if (consumedbytes == len) {`
470	`llen = consumedbytes;`	480	`llen = consumedbytes;`
471	`break;`	481	`break;`
472	`}`	482	`}`
473	`if (buffptr[consumedbytes] == '\r') {`	483	`if (buffptr[consumedbytes] == '\r') {`
474	`llen = consumedbytes;`	484	`llen = consumedbytes;`
475	`consumedbytes++;`	485	`consumedbytes++;`
476	`db->lfonly = 0;`	486	`db->lfonly = 0;`
477	`break;`	487	`break;`
478	`}`	488	`}`
479	`if (buffptr[consumedbytes] == '\n') {`	489	`if (buffptr[consumedbytes] == '\n') {`
480	`eolfound = 1;`	490	`eolfound = 1;`
481	`llen = consumedbytes;`	491	`llen = consumedbytes;`
482	`consumedbytes++;`	492	`consumedbytes++;`
483	`break;`	493	`break;`
484	`}`	494	`}`
485	`}`	495	`}`
486		496
487	`/* consumedbytes is the amount of bytes processed from buffptr,`	497	`/* consumedbytes is the amount of bytes processed from buffptr,`
488	`* llen is the length of line's payload (without its line terminator) */`	498	`* llen is the length of line's payload (without its line terminator) */`
489		499
490	`/* append content, if line is non-empty */`	500	`/* append content, if line is non-empty */`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1551 – Rev 1326 → 1327