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;
 
#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 *uidirtyfrom, unsigned char *uidirtyto, 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 (*uidirtyfrom > y) *uidirtyfrom = y;
  if (*uidirtyto < y+2) *uidirtyto = 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 uidirtyfrom, unsigned char uidirtyto) {
  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 > uidirtyfrom; 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 < uidirtyfrom) continue;
    if (y > uidirtyto) 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 < uidirtyto)) {
      mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);
    }
  }
}
 
 
static void check_cursor_not_after_eol(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->xoffset + db->cursorposx <= db->cursor->len) return;
 
  if (db->cursor->len < db->xoffset) {
    db->cursorposx = 0;
    db->xoffset = db->cursor->len;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  } else {
    db->cursorposx = db->cursor->len - db->xoffset;
  }
}
 
 
static void cursor_up(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->prev != NULL) {
    db->cursor = db->cursor->prev;
    if (db->cursorposy == 0) {
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    } else {
      db->cursorposy -= 1;
    }
  }
}
 
 
static void cursor_eol(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  /* adjust xoffset to make sure eol is visible on screen */
  if (db->xoffset > db->cursor->len) {
    db->xoffset = db->cursor->len - 1;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  }
 
  if (db->xoffset + screenw - 1 <= db->cursor->len) {
    db->xoffset = db->cursor->len - screenw + 2;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  }
  db->cursorposx = db->cursor->len - db->xoffset;
}
 
 
static void cursor_down(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->next != NULL) {
    db->cursor = db->cursor->next;
    if (db->cursorposy < screenh - 2) {
      db->cursorposy += 1;
    } else {
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    }
  }
}
 
 
static void cursor_left(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursorposx > 0) {
    db->cursorposx -= 1;
  } else if (db->xoffset > 0) {
    db->xoffset -= 1;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  } else if (db->cursor->prev != NULL) { /* jump to end of line above */
    cursor_up(db, uidirtyfrom, uidirtyto);
    cursor_eol(db, uidirtyfrom, uidirtyto);
  }
}
 
 
static void cursor_home(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  db->cursorposx = 0;
  if (db->xoffset != 0) {
    db->xoffset = 0;
    *uidirtyfrom = 0;
    *uidirtyto = 0xff;
  }
}
 
 
static void cursor_right(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  if (db->cursor->len > db->xoffset + db->cursorposx) {
    if (db->cursorposx < screenw - 2) {
      db->cursorposx += 1;
    } else {
      db->xoffset += 1;
      *uidirtyfrom = 0;
      *uidirtyto = 0xff;
    }
  } else {
    cursor_down(db, uidirtyfrom, uidirtyto);
    cursor_home(db, uidirtyfrom, uidirtyto);
  }
}
 
 
static void del(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  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 */
    *uidirtyfrom = db->cursorposy;
    *uidirtyto = 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);
    *uidirtyfrom = db->cursorposy;
    *uidirtyto = 0xff;
  }
}
 
 
static void bkspc(struct file *db, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
 
  /* 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, uidirtyfrom, uidirtyto);
  del(db, uidirtyfrom, uidirtyto);
}
 
 
/* 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, unsigned char *uidirtyfrom, unsigned char *uidirtyto) {
  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;
    *uidirtyfrom = db->cursorposy;
    *uidirtyto = db->cursorposy;
    while (len--) {
      db->cursor->payload[off++] = *databuf;
      databuf++;
      cursor_right(db, uidirtyfrom, uidirtyto);
    }
  }
}
 
 
int main(void) {
  const char *fname;
  struct file *db;
 
  unsigned char uidirtyfrom = 0, uidirtyto = 0xff; /* make sure to redraw entire UI at first run */
 
  {
    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, &uidirtyfrom, &uidirtyto);
    mdr_cout_locate(db->cursorposy, db->cursorposx);
 
    if (uidirtyfrom != 0xff) {
      ui_refresh(db, uidirtyfrom, uidirtyto);
      uidirtyfrom = 0xff;
    }
 
    k = keyb_getkey();
 
    if (k == 0x150) { /* down */
      cursor_down(db, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x148) { /* up */
      cursor_up(db, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14D) { /* right */
      cursor_right(db, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14B) { /* left */
      cursor_left(db, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x149) { /* pgup */
      // TODO
 
    } else if (k == 0x151) { /* pgdown */
      // TODO
 
    } else if (k == 0x147) { /* home */
       cursor_home(db, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14F) { /* end */
       cursor_eol(db, &uidirtyfrom, &uidirtyto);
 
    } 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) {
          uidirtyfrom = db->cursorposy;
          db->cursorposy++;
        } else {
          uidirtyfrom = 0;
        }
        uidirtyto = 0xff;
      } else {
        /* ERROR: OUT OF MEMORY */
      }
 
    } else if (k == 0x153) {  /* DEL */
      del(db, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x008) { /* BKSPC */
      bkspc(db, &uidirtyfrom, &uidirtyto);
 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
      char c = k;
      insert_in_line(db, &c, 1, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x009) { /* TAB */
      const char *tab = "        ";
      insert_in_line(db, tab, 8, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x13b) { /* F1 */
      ui_help();
      uidirtyfrom = 0;
      uidirtyto = 0xff;
 
    } else if (k == 0x13f) { /* F5 */
      if (savefile(db) == 0) {
        ui_msg(svarlang_str(0, 2), &uidirtyfrom, &uidirtyto, scheme[COL_MSG]);
        mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
      } else {
        ui_msg(svarlang_str(0, 3), &uidirtyfrom, &uidirtyto, 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, &uidirtyfrom, &uidirtyto);
      }
      /* now skip to next non-space or end of file */
      for (;;) {
        cursor_right(db, &uidirtyfrom, &uidirtyto);
        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, &uidirtyfrom, &uidirtyto);
      /* 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, &uidirtyfrom, &uidirtyto);
      }
      /* now skip to next space or start of file */
      for (;;) {
        cursor_left(db, &uidirtyfrom, &uidirtyto);
        if (db->cursor->payload[db->xoffset + db->cursorposx] == ' ') {
          cursor_right(db, &uidirtyfrom, &uidirtyto);
          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 1325	Rev 1326
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
-		40	`/*****************************************************************************`
-		41	`* global variables and definitions *`
-		42	`*****************************************************************************/`
39	`#define COL_TXT 0`	43	`#define COL_TXT 0`
40	`#define COL_STATUSBAR1 1`	44	`#define COL_STATUSBAR1 1`
41	`#define COL_STATUSBAR2 2`	45	`#define COL_STATUSBAR2 2`
42	`#define COL_SCROLLBAR 3`	46	`#define COL_SCROLLBAR 3`
43	`#define COL_MSG 4`	47	`#define COL_MSG 4`
44	`#define COL_ERR 5`	48	`#define COL_ERR 5`
-		49
45	`/* 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) */`
46	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70, 0x70, 0xf0};`	51	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70, 0x70, 0xf0};`
-		52	`static unsigned char screenw, screenh;`
47		53
48	`#define SCROLL_CURSOR 0xB1`	54	`#define SCROLL_CURSOR 0xB1`
49		55
50		-
51	`struct line {`	56	`struct line {`
52	`struct line far *prev;`	57	`struct line far *prev;`
53	`struct line far *next;`	58	`struct line far *next;`
54	`unsigned short len;`	59	`unsigned short len;`
55	`char payload[1];`	60	`char payload[1];`
56	`};`	61	`};`
57		62
58	`struct file {`	63	`struct file {`
59	`int fd;`	64	`int fd;`
60	`struct line far *cursor;`	65	`struct line far *cursor;`
61	`unsigned short xoffset;`	66	`unsigned short xoffset;`
62	`unsigned char cursorposx;`	67	`unsigned char cursorposx;`
63	`unsigned char cursorposy;`	68	`unsigned char cursorposy;`
64	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`	69	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`
65	`char fname[1]; /* dynamically sized */`	70	`char fname[1]; /* dynamically sized */`
66	`};`	71	`};`
67		72
68		73
-		74	`/*****************************************************************************`
-		75	`* functions *`
-		76	`*****************************************************************************/`
-		77
69	`/* adds a new line at cursor position into file linked list and dvance cursor`	78	`/* adds a new line at cursor position into file linked list and dvance cursor`
70	`* returns non-zero on error */`	79	`* returns non-zero on error */`
71	`static int line_add(struct file db, const char far line) {`	80	`static int line_add(struct file db, const char far line) {`
72	`unsigned short slen;`	81	`unsigned short slen;`
73	`struct line far *l;`	82	`struct line far *l;`
74		83
75	`/* slen = strlen(line) (but for far pointer) */`	84	`/* slen = strlen(line) (but for far pointer) */`
76	`for (slen = 0; line[slen] != 0; slen++);`	85	`for (slen = 0; line[slen] != 0; slen++);`
77		86
78	`/* trim out CR/LF line endings */`	87	`/* trim out CR/LF line endings */`
79	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`	88	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`
80	`slen -= 2;`	89	`slen -= 2;`
81	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`	90	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`
82	`slen--;`	91	`slen--;`
83	`}`	92	`}`
84		93
85	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`	94	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`
86	`if (l == NULL) return(-1);`	95	`if (l == NULL) return(-1);`
87		96
88	`l->prev = db->cursor;`	97	`l->prev = db->cursor;`
89	`if (db->cursor) {`	98	`if (db->cursor) {`
90	`l->next = db->cursor->next;`	99	`l->next = db->cursor->next;`
91	`db->cursor->next = l;`	100	`db->cursor->next = l;`
92	`l->next->prev = l;`	101	`l->next->prev = l;`
93	`}`	102	`}`
94	`db->cursor = l;`	103	`db->cursor = l;`
95	`_fmemcpy(l->payload, line, slen);`	104	`_fmemcpy(l->payload, line, slen);`
96	`l->len = slen;`	105	`l->len = slen;`
97		106
98	`return(0);`	107	`return(0);`
99	`}`	108	`}`
100		109
101		110
102	`/* append a nul-terminated string to line at cursor position */`	111	`/* append a nul-terminated string to line at cursor position */`
103	`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) {`
104	`struct line far *n;`	113	`struct line far *n;`
105	`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 */`
106	`n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);`	115	`n = _frealloc(f->cursor, sizeof(struct line) + f->cursor->len + len);`
107	`if (n == NULL) return(-1);`	116	`if (n == NULL) return(-1);`
108	`f->cursor = n;`	117	`f->cursor = n;`
109	`_fmemcpy(f->cursor->payload + f->cursor->len, buf, len);`	118	`_fmemcpy(f->cursor->payload + f->cursor->len, buf, len);`
110	`f->cursor->len += len;`	119	`f->cursor->len += len;`
111		120
112	`/* rewire the linked list */`	121	`/* rewire the linked list */`
113	`if (f->cursor->next) f->cursor->next->prev = f->cursor;`	122	`if (f->cursor->next) f->cursor->next->prev = f->cursor;`
114	`if (f->cursor->prev) f->cursor->prev->next = f->cursor;`	123	`if (f->cursor->prev) f->cursor->prev->next = f->cursor;`
115		124
116	`return(0);`	125	`return(0);`
117	`}`	126	`}`
118		127
119		128
120	`static void db_rewind(struct file *db) {`	129	`static void db_rewind(struct file *db) {`
121	`if (db->cursor == NULL) return;`	130	`if (db->cursor == NULL) return;`
122	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	131	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
123	`}`	132	`}`
124		133
125		134
126	`static void load_colorscheme(void) {`	135	`static void load_colorscheme(void) {`
127	`scheme[COL_TXT] = 0x17;`	136	`scheme[COL_TXT] = 0x17;`
128	`scheme[COL_STATUSBAR1] = 0x70;`	137	`scheme[COL_STATUSBAR1] = 0x70;`
129	`scheme[COL_STATUSBAR2] = 0x78;`	138	`scheme[COL_STATUSBAR2] = 0x78;`
130	`scheme[COL_SCROLLBAR] = 0x70;`	139	`scheme[COL_SCROLLBAR] = 0x70;`
131	`scheme[COL_MSG] = 0xf0;`	140	`scheme[COL_MSG] = 0xf0;`
132	`scheme[COL_ERR] = 0x4f;`	141	`scheme[COL_ERR] = 0x4f;`
133	`}`	142	`}`
134		143
135		144
136	`static void ui_basic(unsigned char screenw, unsigned char screenh, const struct file *db) {`	145	`static void ui_basic(const struct file *db) {`
137	`unsigned char i;`	146	`unsigned char i;`
138	`const char s = svarlang_strid(0); / HELP */`	147	`const char s = svarlang_strid(0); / HELP */`
139	`unsigned char helpcol = screenw - (strlen(s) + 4);`	148	`unsigned char helpcol = screenw - (strlen(s) + 4);`
140		149
141	`/* fill status bar with background */`	150	`/* fill status bar with background */`
142	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`	151	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`
143		152
144	`/* filename */`	153	`/* filename */`
145	`if (db->fname[0] == 0) {`	154	`if (db->fname[0] == 0) {`
146	`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);`
147	`} else {`	156	`} else {`
148	`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);`
149	`}`	158	`}`
150		159
151	`/* eol type */`	160	`/* eol type */`
152	`if (db->lfonly) {`	161	`if (db->lfonly) {`
153	`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);`
154	`} else {`	163	`} else {`
155	`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);`
156	`}`	165	`}`
157		166
158	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	167	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
159	`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);`
160		169
161	`/* scroll bar */`	170	`/* scroll bar */`
162	`for (i = 0; i < (screenh - 1); i++) {`	171	`for (i = 0; i < (screenh - 1); i++) {`
163	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	172	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
164	`}`	173	`}`
165	`}`	174	`}`
166		175
167		176
168	`static void ui_msg(const char msg, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto, unsigned char attr) {`	177	`static void ui_msg(const char msg, unsigned char uidirtyfrom, unsigned char *uidirtyto, unsigned char attr) {`
169	`unsigned short x, y, msglen, i;`	178	`unsigned short x, y, msglen, i;`
170	`msglen = strlen(msg);`	179	`msglen = strlen(msg);`
171	`y = (screenh - 4) >> 1;`	180	`y = (screenh - 4) >> 1;`
172	`x = (screenw - msglen - 4) >> 1;`	181	`x = (screenw - msglen - 4) >> 1;`
173	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`	182	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`
174	`mdr_cout_str(y+1, x+1, msg, attr, msglen);`	183	`mdr_cout_str(y+1, x+1, msg, attr, msglen);`
175		184
176	`if (uidirtyfrom > y) uidirtyfrom = y;`	185	`if (uidirtyfrom > y) uidirtyfrom = y;`
177	`if (uidirtyto < y+2) uidirtyto = y+2;`	186	`if (uidirtyto < y+2) uidirtyto = y+2;`
178	`}`	187	`}`
179		188
180		189
181	`static void ui_help(unsigned char screenw) {`	190	`static void ui_help(void) {`
182	`#define MAXLINLEN 35`	191	`#define MAXLINLEN 35`
183	`unsigned short i, offset;`	192	`unsigned short i, offset;`
184	`offset = (screenw - MAXLINLEN + 2) >> 1;`	193	`offset = (screenw - MAXLINLEN + 2) >> 1;`
185	`mdr_cout_cursor_hide();`	194	`mdr_cout_cursor_hide();`
186	`for (i = 2; i <= 15; i++) {`	195	`for (i = 2; i <= 15; i++) {`
187	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);`	196	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN + 2);`
188	`}`	197	`}`
189		198
190	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`	199	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`
191	`for (i = 0; i <= 4; i++) {`	200	`for (i = 0; i <= 4; i++) {`
192	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`	201	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`
193	`}`	202	`}`
194	`mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`	203	`mdr_cout_str(5 + 1 + i, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`
195		204
196	`/* Press any key */`	205	`/* Press any key */`
197	`mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`	206	`mdr_cout_str(14, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`
198		207
199	`keyb_getkey();`	208	`keyb_getkey();`
200	`mdr_cout_cursor_show();`	209	`mdr_cout_cursor_show();`
201	`#undef MAXLINLEN`	210	`#undef MAXLINLEN`
202	`}`	211	`}`
203		212
204		213
205	`static void ui_refresh(const struct file *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	214	`static void ui_refresh(const struct file *db, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
206	`unsigned char x;`	215	`unsigned char x;`
207	`const struct line far *l;`	216	`const struct line far *l;`
208	`unsigned char y = db->cursorposy;`	217	`unsigned char y = db->cursorposy;`
209		218
210	`#ifdef DBG_REFRESH`	219	`#ifdef DBG_REFRESH`
211	`static char m = 'a';`	220	`static char m = 'a';`
212	`m++;`	221	`m++;`
213	`if (m > 'z') m = 'a';`	222	`if (m > 'z') m = 'a';`
214	`#endif`	223	`#endif`
215		224
216	`/* rewind cursor line to first line that needs redrawing */`	225	`/* rewind cursor line to first line that needs redrawing */`
217	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`	226	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`
218		227
219	`/* iterate over lines and redraw whatever needs to be redrawn */`	228	`/* iterate over lines and redraw whatever needs to be redrawn */`
220	`for (; l != NULL; l = l->next, y++) {`	229	`for (; l != NULL; l = l->next, y++) {`
221		230
222	`/* skip lines that do not need to be refreshed */`	231	`/* skip lines that do not need to be refreshed */`
223	`if (y < uidirtyfrom) continue;`	232	`if (y < uidirtyfrom) continue;`
224	`if (y > uidirtyto) break;`	233	`if (y > uidirtyto) break;`
225		234
226	`x = 0;`	235	`x = 0;`
227	`if (db->xoffset < l->len) {`	236	`if (db->xoffset < l->len) {`
228	`unsigned char i, limit;`	237	`unsigned char i, limit;`
229	`if (l->len - db->xoffset < screenw) {`	238	`if (l->len - db->xoffset < screenw) {`
230	`limit = l->len;`	239	`limit = l->len;`
231	`} else {`	240	`} else {`
232	`limit = db->xoffset + screenw - 1;`	241	`limit = db->xoffset + screenw - 1;`
233	`}`	242	`}`
234	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`	243	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`
235	`}`	244	`}`
236		245
237	`/* write empty spaces until end of line */`	246	`/* write empty spaces until end of line */`
238	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`	247	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`
239		248
240	`#ifdef DBG_REFRESH`	249	`#ifdef DBG_REFRESH`
241	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	250	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
242	`#endif`	251	`#endif`
243		252
244	`if (y == screenh - 2) break;`	253	`if (y == screenh - 2) break;`
245	`}`	254	`}`
246		255
247	`/* fill all lines below if empty (and they need to be redrawn) */`	256	`/* fill all lines below if empty (and they need to be redrawn) */`
248	`if (l == NULL) {`	257	`if (l == NULL) {`
249	`while ((y < screenh - 1) && (y < uidirtyto)) {`	258	`while ((y < screenh - 1) && (y < uidirtyto)) {`
250	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`	259	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`
251	`}`	260	`}`
252	`}`	261	`}`
253	`}`	262	`}`
254		263
255		264
256	`static void check_cursor_not_after_eol(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	265	`static void check_cursor_not_after_eol(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
257	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	266	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
258		267
259	`if (db->cursor->len < db->xoffset) {`	268	`if (db->cursor->len < db->xoffset) {`
260	`db->cursorposx = 0;`	269	`db->cursorposx = 0;`
261	`db->xoffset = db->cursor->len;`	270	`db->xoffset = db->cursor->len;`
262	`*uidirtyfrom = 0;`	271	`*uidirtyfrom = 0;`
263	`*uidirtyto = 0xff;`	272	`*uidirtyto = 0xff;`
264	`} else {`	273	`} else {`
265	`db->cursorposx = db->cursor->len - db->xoffset;`	274	`db->cursorposx = db->cursor->len - db->xoffset;`
266	`}`	275	`}`
267	`}`	276	`}`
268		277
269		278
270	`static void cursor_up(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	279	`static void cursor_up(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
271	`if (db->cursor->prev != NULL) {`	280	`if (db->cursor->prev != NULL) {`
272	`db->cursor = db->cursor->prev;`	281	`db->cursor = db->cursor->prev;`
273	`if (db->cursorposy == 0) {`	282	`if (db->cursorposy == 0) {`
274	`*uidirtyfrom = 0;`	283	`*uidirtyfrom = 0;`
275	`*uidirtyto = 0xff;`	284	`*uidirtyto = 0xff;`
276	`} else {`	285	`} else {`
277	`db->cursorposy -= 1;`	286	`db->cursorposy -= 1;`
278	`}`	287	`}`
279	`}`	288	`}`
280	`}`	289	`}`
281		290
282		291
283	`static void cursor_eol(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	292	`static void cursor_eol(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
284	`/* adjust xoffset to make sure eol is visible on screen */`	293	`/* adjust xoffset to make sure eol is visible on screen */`
285	`if (db->xoffset > db->cursor->len) {`	294	`if (db->xoffset > db->cursor->len) {`
286	`db->xoffset = db->cursor->len - 1;`	295	`db->xoffset = db->cursor->len - 1;`
287	`*uidirtyfrom = 0;`	296	`*uidirtyfrom = 0;`
288	`*uidirtyto = 0xff;`	297	`*uidirtyto = 0xff;`
289	`}`	298	`}`
290		299
291	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	300	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
292	`db->xoffset = db->cursor->len - screenw + 2;`	301	`db->xoffset = db->cursor->len - screenw + 2;`
293	`*uidirtyfrom = 0;`	302	`*uidirtyfrom = 0;`
294	`*uidirtyto = 0xff;`	303	`*uidirtyto = 0xff;`
295	`}`	304	`}`
296	`db->cursorposx = db->cursor->len - db->xoffset;`	305	`db->cursorposx = db->cursor->len - db->xoffset;`
297	`}`	306	`}`
298		307
299		308
300	`static void cursor_down(struct file db, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	309	`static void cursor_down(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
301	`if (db->cursor->next != NULL) {`	310	`if (db->cursor->next != NULL) {`
302	`db->cursor = db->cursor->next;`	311	`db->cursor = db->cursor->next;`
303	`if (db->cursorposy < screenh - 2) {`	312	`if (db->cursorposy < screenh - 2) {`
304	`db->cursorposy += 1;`	313	`db->cursorposy += 1;`
305	`} else {`	314	`} else {`
306	`*uidirtyfrom = 0;`	315	`*uidirtyfrom = 0;`
307	`*uidirtyto = 0xff;`	316	`*uidirtyto = 0xff;`
308	`}`	317	`}`
309	`}`	318	`}`
310	`}`	319	`}`
311		320
312		321
313	`static void cursor_left(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	322	`static void cursor_left(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
314	`if (db->cursorposx > 0) {`	323	`if (db->cursorposx > 0) {`
315	`db->cursorposx -= 1;`	324	`db->cursorposx -= 1;`
316	`} else if (db->xoffset > 0) {`	325	`} else if (db->xoffset > 0) {`
317	`db->xoffset -= 1;`	326	`db->xoffset -= 1;`
318	`*uidirtyfrom = 0;`	327	`*uidirtyfrom = 0;`
319	`*uidirtyto = 0xff;`	328	`*uidirtyto = 0xff;`
320	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	329	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
321	`cursor_up(db, uidirtyfrom, uidirtyto);`	330	`cursor_up(db, uidirtyfrom, uidirtyto);`
322	`cursor_eol(db, screenw, uidirtyfrom, uidirtyto);`	331	`cursor_eol(db, uidirtyfrom, uidirtyto);`
323	`}`	332	`}`
324	`}`	333	`}`
325		334
326		335
327	`static void cursor_home(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	336	`static void cursor_home(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
328	`db->cursorposx = 0;`	337	`db->cursorposx = 0;`
329	`if (db->xoffset != 0) {`	338	`if (db->xoffset != 0) {`
330	`db->xoffset = 0;`	339	`db->xoffset = 0;`
331	`*uidirtyfrom = 0;`	340	`*uidirtyfrom = 0;`
332	`*uidirtyto = 0xff;`	341	`*uidirtyto = 0xff;`
333	`}`	342	`}`
334	`}`	343	`}`
335		344
336		345
337	`static void cursor_right(struct file db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	346	`static void cursor_right(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
338	`if (db->cursor->len > db->xoffset + db->cursorposx) {`	347	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
339	`if (db->cursorposx < screenw - 2) {`	348	`if (db->cursorposx < screenw - 2) {`
340	`db->cursorposx += 1;`	349	`db->cursorposx += 1;`
341	`} else {`	350	`} else {`
342	`db->xoffset += 1;`	351	`db->xoffset += 1;`
343	`*uidirtyfrom = 0;`	352	`*uidirtyfrom = 0;`
344	`*uidirtyto = 0xff;`	353	`*uidirtyto = 0xff;`
345	`}`	354	`}`
346	`} else {`	355	`} else {`
347	`cursor_down(db, screenh, uidirtyfrom, uidirtyto);`	356	`cursor_down(db, uidirtyfrom, uidirtyto);`
348	`cursor_home(db, uidirtyfrom, uidirtyto);`	357	`cursor_home(db, uidirtyfrom, uidirtyto);`
349	`}`	358	`}`
350	`}`	359	`}`
351		360
352		361
353	`static void del(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	362	`static void del(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
354	`if (db->cursorposx + db->xoffset < db->cursor->len) {`	363	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
355	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`	364	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`
356	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	365	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
357	`*uidirtyfrom = db->cursorposy;`	366	`*uidirtyfrom = db->cursorposy;`
358	`*uidirtyto = db->cursorposy;`	367	`*uidirtyto = db->cursorposy;`
359	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	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) */`
360	`struct line far *nextline = db->cursor->next;`	369	`struct line far *nextline = db->cursor->next;`
361	`if (db->cursor->next->len > 0) {`	370	`if (db->cursor->next->len > 0) {`
362	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	371	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
363	`if (newptr != NULL) {`	372	`if (newptr != NULL) {`
364	`db->cursor = newptr;`	373	`db->cursor = newptr;`
365	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	374	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
366	`db->cursor->len += db->cursor->next->len;`	375	`db->cursor->len += db->cursor->next->len;`
367	`}`	376	`}`
368	`}`	377	`}`
369	`db->cursor->next = db->cursor->next->next;`	378	`db->cursor->next = db->cursor->next->next;`
370	`db->cursor->next->prev = db->cursor;`	379	`db->cursor->next->prev = db->cursor;`
371	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	380	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
372	`_ffree(nextline);`	381	`_ffree(nextline);`
373	`*uidirtyfrom = db->cursorposy;`	382	`*uidirtyfrom = db->cursorposy;`
374	`*uidirtyto = 0xff;`	383	`*uidirtyto = 0xff;`
375	`}`	384	`}`
376	`}`	385	`}`
377		386
378		387
379	`static void bkspc(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	388	`static void bkspc(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
380		389
381	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	390	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
382	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	391	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
383		392
384	`cursor_left(db, screenw, uidirtyfrom, uidirtyto);`	393	`cursor_left(db, uidirtyfrom, uidirtyto);`
385	`del(db, uidirtyfrom, uidirtyto);`	394	`del(db, uidirtyfrom, uidirtyto);`
386	`}`	395	`}`
387		396
388		397
389	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	398	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
390	`* of argc and argv, saves some 330 bytes of binary size */`	399	`* of argc and argv, saves some 330 bytes of binary size */`
391	`static char *parseargv(void) {`	400	`static char *parseargv(void) {`
392	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	401	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
393	`unsigned char count = 0;`	402	`unsigned char count = 0;`
394	`char *argv[4];`	403	`char *argv[4];`
395		404
396	`while (count < 4) {`	405	`while (count < 4) {`
397	`/* jump to nearest arg */`	406	`/* jump to nearest arg */`
398	`while (*tail == ' ') {`	407	`while (*tail == ' ') {`
399	`*tail = 0;`	408	`*tail = 0;`
400	`tail++;`	409	`tail++;`
401	`}`	410	`}`
402		411
403	`if (*tail == '\r') {`	412	`if (*tail == '\r') {`
404	`*tail = 0;`	413	`*tail = 0;`
405	`break;`	414	`break;`
406	`}`	415	`}`
407		416
408	`argv[count++] = tail;`	417	`argv[count++] = tail;`
409		418
410	`/* jump to next delimiter */`	419	`/* jump to next delimiter */`
411	`while ((tail != ' ') && (tail != '\r')) tail++;`	420	`while ((tail != ' ') && (tail != '\r')) tail++;`
412	`}`	421	`}`
413		422
414	`/* check args now */`	423	`/* check args now */`
415	`if (count == 0) return("");`	424	`if (count == 0) return("");`
416		425
417	`return(argv[0]);`	426	`return(argv[0]);`
418	`}`	427	`}`
419		428
420		429
421	`static struct file loadfile(const char fname) {`	430	`static struct file loadfile(const char fname) {`
422	`char buff[512]; /* read one entire sector at a time (faster) */`	431	`char buff[512]; /* read one entire sector at a time (faster) */`
423	`char *buffptr;`	432	`char *buffptr;`
424	`unsigned int len, llen;`	433	`unsigned int len, llen;`
425	`int fd;`	434	`int fd;`
426	`unsigned char eolfound;`	435	`unsigned char eolfound;`
427	`struct file *db;`	436	`struct file *db;`
428		437
429	`len = strlen(fname) + 1;`	438	`len = strlen(fname) + 1;`
430	`db = calloc(1, sizeof(struct file) + len);`	439	`db = calloc(1, sizeof(struct file) + len);`
431	`if (db == NULL) return(NULL);`	440	`if (db == NULL) return(NULL);`
432	`memcpy(db->fname, fname, len);`	441	`memcpy(db->fname, fname, len);`
433		442
434	`if (*fname == 0) goto SKIPLOADING;`	443	`if (*fname == 0) goto SKIPLOADING;`
435		444
436	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	445	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
437	`mdr_coutraw_puts("Failed to open file:");`	446	`mdr_coutraw_puts("Failed to open file:");`
438	`mdr_coutraw_puts(fname);`	447	`mdr_coutraw_puts(fname);`
439	`free(db);`	448	`free(db);`
440	`return(NULL);`	449	`return(NULL);`
441	`}`	450	`}`
442		451
443	`db->lfonly = 1;`	452	`db->lfonly = 1;`
444		453
445	`/* start by adding an empty line */`	454	`/* start by adding an empty line */`
446	`if (line_add(db, "") != 0) {`	455	`if (line_add(db, "") != 0) {`
447	`/* TODO ERROR HANDLING */`	456	`/* TODO ERROR HANDLING */`
448	`}`	457	`}`
449		458
450	`for (eolfound = 0;;) {`	459	`for (eolfound = 0;;) {`
451	`unsigned short consumedbytes;`	460	`unsigned short consumedbytes;`
452		461
453	`if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) \|\| (len == 0)) break;`	462	`if ((_dos_read(fd, buff, sizeof(buff), &len) != 0) \|\| (len == 0)) break;`
454	`buffptr = buff;`	463	`buffptr = buff;`
455		464
456	`FINDLINE:`	465	`FINDLINE:`
457		466
458	`/* look for nearest \n */`	467	`/* look for nearest \n */`
459	`for (consumedbytes = 0;; consumedbytes++) {`	468	`for (consumedbytes = 0;; consumedbytes++) {`
460	`if (consumedbytes == len) {`	469	`if (consumedbytes == len) {`
461	`llen = consumedbytes;`	470	`llen = consumedbytes;`
462	`break;`	471	`break;`
463	`}`	472	`}`
464	`if (buffptr[consumedbytes] == '\r') {`	473	`if (buffptr[consumedbytes] == '\r') {`
465	`llen = consumedbytes;`	474	`llen = consumedbytes;`
466	`consumedbytes++;`	475	`consumedbytes++;`
467	`db->lfonly = 0;`	476	`db->lfonly = 0;`
468	`break;`	477	`break;`
469	`}`	478	`}`
470	`if (buffptr[consumedbytes] == '\n') {`	479	`if (buffptr[consumedbytes] == '\n') {`
471	`eolfound = 1;`	480	`eolfound = 1;`
472	`llen = consumedbytes;`	481	`llen = consumedbytes;`
473	`consumedbytes++;`	482	`consumedbytes++;`
474	`break;`	483	`break;`
475	`}`	484	`}`
476	`}`	485	`}`
477		486
478	`/* consumedbytes is the amount of bytes processed from buffptr,`	487	`/* consumedbytes is the amount of bytes processed from buffptr,`
479	`* llen is the length of line's payload (without its line terminator) */`	488	`* llen is the length of line's payload (without its line terminator) */`
480		489
481	`/* append content, if line is non-empty */`	490	`/* append content, if line is non-empty */`
482	`if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {`	491	`if ((llen > 0) && (line_append(db, buffptr, llen) != 0)) {`
483	`mdr_coutraw_puts("out of memory");`	492	`mdr_coutraw_puts("out of memory");`
484	`free(db);`	493	`free(db);`
485	`db = NULL;`	494	`db = NULL;`
486	`break;`	495	`break;`
487	`}`	496	`}`
488		497
489	`/* add a new line if necessary */`	498	`/* add a new line if necessary */`
490	`if (eolfound) {`	499	`if (eolfound) {`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c/ @ 1555 – Rev 1325 → 1326