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"
 
#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, 0x70};
 
#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 */
};
 
 
/* 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);
}
 
 
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] = 0x2f;
  scheme[COL_ERR] = 0x4f;
}
 
 
static void ui_basic(unsigned char screenw, unsigned char screenh, 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 screenw, unsigned char screenh, 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(unsigned char screenw) {
#define MAXLINLEN 35
  unsigned short i, offset;
  offset = (screenw - MAXLINLEN + 1) >> 1;
  mdr_cout_cursor_hide();
  for (i = 2; i <= 12; i++) {
    mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);
  }
 
  mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);
  for (i = 0; i <= 2; i++) {
    mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);
  }
  mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);
  mdr_cout_str(11, 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 screenw, unsigned char screenh, 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 screenw, 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 screenh, 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 screenw, 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, screenw, 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 screenw, unsigned char screenh, 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, screenh, 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 screenw, 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, screenw, 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[1024];
  unsigned int prevlen = 0, len, llen;
  int fd;
  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;
 
  do {
    if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {
      len += prevlen;
    } else {
      len = prevlen;
    }
 
    /* look for nearest \n and replace with 0*/
    for (llen = 0; buff[llen] != '\n'; llen++) {
      if (llen == sizeof(buff)) { /* TODO line too long: handle it in some classy way */
        break;
      }
    }
    buff[llen] = 0;
    if ((llen > 0) && (buff[llen - 1] == '\r')) {
      buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */
      db->lfonly = 0;
    }
    if (line_add(db, buff) != 0) {
      mdr_coutraw_puts("out of memory");
      free(db);
      db = NULL;
      break;
    }
 
    len -= llen + 1;
    memmove(buff, buff + llen + 1, len);
    prevlen = len;
  } while (len > 0);
 
  _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) {
    _dos_write(fd, l->payload, l->len, &bytes);
    _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 screenw, unsigned char screenh, 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, screenw, screenh, uidirtyfrom, uidirtyto);
    }
  }
}
 
 
int main(void) {
  const char *fname;
  struct file *db;
  unsigned char screenw = 0, screenh = 0;
  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(screenw, screenh, 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, screenw, screenh, uidirtyfrom, uidirtyto);
      uidirtyfrom = 0xff;
    }
 
    k = keyb_getkey();
 
    if (k == 0x150) { /* down */
      cursor_down(db, screenh, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x148) { /* up */
      cursor_up(db, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14D) { /* right */
      cursor_right(db, screenw, screenh, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x14B) { /* left */
      cursor_left(db, screenw, &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, screenw, &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, screenw, &uidirtyfrom, &uidirtyto);
 
    } else if ((k >= 0x20) && (k <= 0xff)) { /* "normal" character */
      char c = k;
      insert_in_line(db, &c, 1, screenw, screenh, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x009) { /* TAB */
      const char *tab = "        ";
      insert_in_line(db, tab, 8, screenw, screenh, &uidirtyfrom, &uidirtyto);
 
    } else if (k == 0x13b) { /* F1 */
      ui_help(screenw);
      uidirtyfrom = 0;
      uidirtyto = 0xff;
 
    } else if (k == 0x13f) { /* F5 */
      if (savefile(db) == 0) {
        ui_msg(svarlang_str(0, 2), screenw, screenh, &uidirtyfrom, &uidirtyto, scheme[COL_MSG]);
        mdr_bios_tickswait(11); /* 11 ticks is about 600 ms */
      } else {
 
        ui_msg(svarlang_str(0, 3), screenw, screenh, &uidirtyfrom, &uidirtyto, scheme[COL_ERR]);
        mdr_bios_tickswait(36); /* 2s */
      }
 
    } else if (k == 0x144) { /* F10 */
      db->lfonly ^= 1;
      ui_basic(screenw, screenh, db);
 
    } 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 1321	Rev 1322
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	`#define COL_TXT 0`	39	`#define COL_TXT 0`
40	`#define COL_STATUSBAR1 1`	40	`#define COL_STATUSBAR1 1`
41	`#define COL_STATUSBAR2 2`	41	`#define COL_STATUSBAR2 2`
42	`#define COL_SCROLLBAR 3`	42	`#define COL_SCROLLBAR 3`
-		43	`#define COL_MSG 4`
-		44	`#define COL_ERR 5`
43	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`	45	`/* preload the mono scheme (to be overloaded at runtime if color adapter present) */`
44	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70};`	46	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70, 0x70, 0x70};`
45		47
46	`#define SCROLL_CURSOR 0xB1`	48	`#define SCROLL_CURSOR 0xB1`
47		49
48		50
49	`struct line {`	51	`struct line {`
50	`struct line far *prev;`	52	`struct line far *prev;`
51	`struct line far *next;`	53	`struct line far *next;`
52	`unsigned short len;`	54	`unsigned short len;`
53	`char payload[1];`	55	`char payload[1];`
54	`};`	56	`};`
55		57
56	`struct file {`	58	`struct file {`
57	`int fd;`	59	`int fd;`
58	`struct line far *cursor;`	60	`struct line far *cursor;`
59	`unsigned short xoffset;`	61	`unsigned short xoffset;`
60	`unsigned char cursorposx;`	62	`unsigned char cursorposx;`
61	`unsigned char cursorposy;`	63	`unsigned char cursorposy;`
62	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`	64	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`
63	`char fname[1]; /* dynamically sized */`	65	`char fname[1]; /* dynamically sized */`
64	`};`	66	`};`
65		67
66		68
67	`/* returns non-zero on error */`	69	`/* returns non-zero on error */`
68	`static int line_add(struct file db, const char far line) {`	70	`static int line_add(struct file db, const char far line) {`
69	`unsigned short slen;`	71	`unsigned short slen;`
70	`struct line far *l;`	72	`struct line far *l;`
71		73
72	`/* slen = strlen(line) (but for far pointer) */`	74	`/* slen = strlen(line) (but for far pointer) */`
73	`for (slen = 0; line[slen] != 0; slen++);`	75	`for (slen = 0; line[slen] != 0; slen++);`
74		76
75	`/* trim out CR/LF line endings */`	77	`/* trim out CR/LF line endings */`
76	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`	78	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`
77	`slen -= 2;`	79	`slen -= 2;`
78	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`	80	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`
79	`slen--;`	81	`slen--;`
80	`}`	82	`}`
81		83
82	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`	84	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`
83	`if (l == NULL) return(-1);`	85	`if (l == NULL) return(-1);`
84		86
85	`l->prev = db->cursor;`	87	`l->prev = db->cursor;`
86	`if (db->cursor) {`	88	`if (db->cursor) {`
87	`l->next = db->cursor->next;`	89	`l->next = db->cursor->next;`
88	`db->cursor->next = l;`	90	`db->cursor->next = l;`
89	`l->next->prev = l;`	91	`l->next->prev = l;`
90	`}`	92	`}`
91	`db->cursor = l;`	93	`db->cursor = l;`
92	`_fmemcpy(l->payload, line, slen);`	94	`_fmemcpy(l->payload, line, slen);`
93	`l->len = slen;`	95	`l->len = slen;`
94		96
95	`return(0);`	97	`return(0);`
96	`}`	98	`}`
97		99
98		100
99	`static void db_rewind(struct file *db) {`	101	`static void db_rewind(struct file *db) {`
100	`if (db->cursor == NULL) return;`	102	`if (db->cursor == NULL) return;`
101	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	103	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
102	`}`	104	`}`
103		105
104		106
105	`static void load_colorscheme(void) {`	107	`static void load_colorscheme(void) {`
106	`scheme[COL_TXT] = 0x17;`	108	`scheme[COL_TXT] = 0x17;`
107	`scheme[COL_STATUSBAR1] = 0x70;`	109	`scheme[COL_STATUSBAR1] = 0x70;`
108	`scheme[COL_STATUSBAR2] = 0x78;`	110	`scheme[COL_STATUSBAR2] = 0x78;`
109	`scheme[COL_SCROLLBAR] = 0x70;`	111	`scheme[COL_SCROLLBAR] = 0x70;`
-		112	`scheme[COL_MSG] = 0x2f;`
-		113	`scheme[COL_ERR] = 0x4f;`
110	`}`	114	`}`
111		115
112		116
113	`static void ui_basic(unsigned char screenw, unsigned char screenh, const struct file *db) {`	117	`static void ui_basic(unsigned char screenw, unsigned char screenh, const struct file *db) {`
114	`unsigned char i;`	118	`unsigned char i;`
115	`const char s = svarlang_strid(0); / HELP */`	119	`const char s = svarlang_strid(0); / HELP */`
116	`unsigned char helpcol = screenw - (strlen(s) + 4);`	120	`unsigned char helpcol = screenw - (strlen(s) + 4);`
117		121
118	`/* fill status bar with background */`	122	`/* fill status bar with background */`
119	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`	123	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`
120		124
121	`/* filename */`	125	`/* filename */`
122	`if (db->fname[0] == 0) {`	126	`if (db->fname[0] == 0) {`
123	`mdr_cout_str(screenh - 1, 0, svarlang_str(0, 1), scheme[COL_STATUSBAR1], screenw);`	127	`mdr_cout_str(screenh - 1, 0, svarlang_str(0, 1), scheme[COL_STATUSBAR1], screenw);`
124	`} else {`	128	`} else {`
125	`mdr_cout_str(screenh - 1, 0, db->fname, scheme[COL_STATUSBAR1], screenw);`	129	`mdr_cout_str(screenh - 1, 0, db->fname, scheme[COL_STATUSBAR1], screenw);`
126	`}`	130	`}`
127		131
128	`/* eol type */`	132	`/* eol type */`
129	`if (db->lfonly) {`	133	`if (db->lfonly) {`
130	`mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);`	134	`mdr_cout_str(screenh - 1, helpcol - 3, "LF", scheme[COL_STATUSBAR1], 5);`
131	`} else {`	135	`} else {`
132	`mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);`	136	`mdr_cout_str(screenh - 1, helpcol - 5, "CRLF", scheme[COL_STATUSBAR1], 5);`
133	`}`	137	`}`
134		138
135	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	139	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
136	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`	140	`mdr_cout_str(screenh - 1, helpcol + 4, s, scheme[COL_STATUSBAR2], 40);`
137		141
138	`/* scroll bar */`	142	`/* scroll bar */`
139	`for (i = 0; i < (screenh - 1); i++) {`	143	`for (i = 0; i < (screenh - 1); i++) {`
140	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	144	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
141	`}`	145	`}`
142	`}`	146	`}`
143		147
144		148
145	`static void ui_msg(const char msg, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	149	`static void ui_msg(const char msg, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto, unsigned char attr) {`
146	`unsigned short x, y, msglen, i;`	150	`unsigned short x, y, msglen, i;`
147	`msglen = strlen(msg);`	151	`msglen = strlen(msg);`
148	`y = (screenh - 4) >> 1;`	152	`y = (screenh - 4) >> 1;`
149	`x = (screenw - msglen - 4) >> 1;`	153	`x = (screenw - msglen - 4) >> 1;`
150	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', scheme[COL_STATUSBAR1], msglen + 2);`	154	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`
151	`mdr_cout_str(y+1, x+1, msg, scheme[COL_STATUSBAR1], msglen);`	155	`mdr_cout_str(y+1, x+1, msg, attr, msglen);`
152		156
153	`if (uidirtyfrom > y) uidirtyfrom = y;`	157	`if (uidirtyfrom > y) uidirtyfrom = y;`
154	`if (uidirtyto < y+2) uidirtyto = y+2;`	158	`if (uidirtyto < y+2) uidirtyto = y+2;`
155	`}`	159	`}`
156		160
157		161
158	`static void ui_help(unsigned char screenw) {`	162	`static void ui_help(unsigned char screenw) {`
159	`#define MAXLINLEN 35`	163	`#define MAXLINLEN 35`
160	`unsigned short i, offset;`	164	`unsigned short i, offset;`
161	`offset = (screenw - MAXLINLEN + 1) >> 1;`	165	`offset = (screenw - MAXLINLEN + 1) >> 1;`
162	`mdr_cout_cursor_hide();`	166	`mdr_cout_cursor_hide();`
163	`for (i = 2; i <= 12; i++) {`	167	`for (i = 2; i <= 12; i++) {`
164	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);`	168	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);`
165	`}`	169	`}`
166		170
167	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`	171	`mdr_cout_str(3, offset, svarlang_str(0, 0), scheme[COL_STATUSBAR1], MAXLINLEN);`
168	`for (i = 0; i <= 2; i++) {`	172	`for (i = 0; i <= 2; i++) {`
169	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`	173	`mdr_cout_str(5 + i, offset, svarlang_str(8, i), scheme[COL_STATUSBAR1], MAXLINLEN);`
170	`}`	174	`}`
171	`mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`	175	`mdr_cout_str(9, offset, svarlang_str(8, 10), scheme[COL_STATUSBAR1], MAXLINLEN);`
172	`mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`	176	`mdr_cout_str(11, offset, svarlang_str(8, 11), scheme[COL_STATUSBAR1], MAXLINLEN);`
173		177
174	`keyb_getkey();`	178	`keyb_getkey();`
175	`mdr_cout_cursor_show();`	179	`mdr_cout_cursor_show();`
176	`#undef MAXLINLEN`	180	`#undef MAXLINLEN`
177	`}`	181	`}`
178		182
179		183
180	`static void ui_refresh(const struct file *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`	184	`static void ui_refresh(const struct file *db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char uidirtyto) {`
181	`unsigned char x;`	185	`unsigned char x;`
182	`const struct line far *l;`	186	`const struct line far *l;`
183	`unsigned char y = db->cursorposy;`	187	`unsigned char y = db->cursorposy;`
184		188
185	`#ifdef DBG_REFRESH`	189	`#ifdef DBG_REFRESH`
186	`static char m = 'a';`	190	`static char m = 'a';`
187	`m++;`	191	`m++;`
188	`if (m > 'z') m = 'a';`	192	`if (m > 'z') m = 'a';`
189	`#endif`	193	`#endif`
190		194
191	`/* rewind cursor line to first line that needs redrawing */`	195	`/* rewind cursor line to first line that needs redrawing */`
192	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`	196	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`
193		197
194	`/* iterate over lines and redraw whatever needs to be redrawn */`	198	`/* iterate over lines and redraw whatever needs to be redrawn */`
195	`for (; l != NULL; l = l->next, y++) {`	199	`for (; l != NULL; l = l->next, y++) {`
196		200
197	`/* skip lines that do not need to be refreshed */`	201	`/* skip lines that do not need to be refreshed */`
198	`if (y < uidirtyfrom) continue;`	202	`if (y < uidirtyfrom) continue;`
199	`if (y > uidirtyto) break;`	203	`if (y > uidirtyto) break;`
200		204
201	`x = 0;`	205	`x = 0;`
202	`if (db->xoffset < l->len) {`	206	`if (db->xoffset < l->len) {`
203	`unsigned char i, limit;`	207	`unsigned char i, limit;`
204	`if (l->len - db->xoffset < screenw) {`	208	`if (l->len - db->xoffset < screenw) {`
205	`limit = l->len;`	209	`limit = l->len;`
206	`} else {`	210	`} else {`
207	`limit = db->xoffset + screenw - 1;`	211	`limit = db->xoffset + screenw - 1;`
208	`}`	212	`}`
209	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`	213	`for (i = db->xoffset; i < limit; i++) mdr_cout_char(y, x++, l->payload[i], scheme[COL_TXT]);`
210	`}`	214	`}`
211		215
212	`/* write empty spaces until end of line */`	216	`/* write empty spaces until end of line */`
213	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`	217	`if (x < screenw - 1) mdr_cout_char_rep(y, x, ' ', scheme[COL_TXT], screenw - 1 - x);`
214		218
215	`#ifdef DBG_REFRESH`	219	`#ifdef DBG_REFRESH`
216	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	220	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
217	`#endif`	221	`#endif`
218		222
219	`if (y == screenh - 2) break;`	223	`if (y == screenh - 2) break;`
220	`}`	224	`}`
221		225
222	`/* fill all lines below if empty (and they need to be redrawn) */`	226	`/* fill all lines below if empty (and they need to be redrawn) */`
223	`if (l == NULL) {`	227	`if (l == NULL) {`
224	`while ((y < screenh - 1) && (y < uidirtyto)) {`	228	`while ((y < screenh - 1) && (y < uidirtyto)) {`
225	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`	229	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`
226	`}`	230	`}`
227	`}`	231	`}`
228	`}`	232	`}`
229		233
230		234
231	`static void check_cursor_not_after_eol(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	235	`static void check_cursor_not_after_eol(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
232	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	236	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
233		237
234	`if (db->cursor->len < db->xoffset) {`	238	`if (db->cursor->len < db->xoffset) {`
235	`db->cursorposx = 0;`	239	`db->cursorposx = 0;`
236	`db->xoffset = db->cursor->len;`	240	`db->xoffset = db->cursor->len;`
237	`*uidirtyfrom = 0;`	241	`*uidirtyfrom = 0;`
238	`*uidirtyto = 0xff;`	242	`*uidirtyto = 0xff;`
239	`} else {`	243	`} else {`
240	`db->cursorposx = db->cursor->len - db->xoffset;`	244	`db->cursorposx = db->cursor->len - db->xoffset;`
241	`}`	245	`}`
242	`}`	246	`}`
243		247
244		248
245	`static void cursor_up(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	249	`static void cursor_up(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
246	`if (db->cursor->prev != NULL) {`	250	`if (db->cursor->prev != NULL) {`
247	`db->cursor = db->cursor->prev;`	251	`db->cursor = db->cursor->prev;`
248	`if (db->cursorposy == 0) {`	252	`if (db->cursorposy == 0) {`
249	`*uidirtyfrom = 0;`	253	`*uidirtyfrom = 0;`
250	`*uidirtyto = 0xff;`	254	`*uidirtyto = 0xff;`
251	`} else {`	255	`} else {`
252	`db->cursorposy -= 1;`	256	`db->cursorposy -= 1;`
253	`}`	257	`}`
254	`}`	258	`}`
255	`}`	259	`}`
256		260
257		261
258	`static void cursor_eol(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	262	`static void cursor_eol(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
259	`/* adjust xoffset to make sure eol is visible on screen */`	263	`/* adjust xoffset to make sure eol is visible on screen */`
260	`if (db->xoffset > db->cursor->len) {`	264	`if (db->xoffset > db->cursor->len) {`
261	`db->xoffset = db->cursor->len - 1;`	265	`db->xoffset = db->cursor->len - 1;`
262	`*uidirtyfrom = 0;`	266	`*uidirtyfrom = 0;`
263	`*uidirtyto = 0xff;`	267	`*uidirtyto = 0xff;`
264	`}`	268	`}`
265		269
266	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	270	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
267	`db->xoffset = db->cursor->len - screenw + 2;`	271	`db->xoffset = db->cursor->len - screenw + 2;`
268	`*uidirtyfrom = 0;`	272	`*uidirtyfrom = 0;`
269	`*uidirtyto = 0xff;`	273	`*uidirtyto = 0xff;`
270	`}`	274	`}`
271	`db->cursorposx = db->cursor->len - db->xoffset;`	275	`db->cursorposx = db->cursor->len - db->xoffset;`
272	`}`	276	`}`
273		277
274		278
275	`static void cursor_down(struct file db, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	279	`static void cursor_down(struct file db, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
276	`if (db->cursor->next != NULL) {`	280	`if (db->cursor->next != NULL) {`
277	`db->cursor = db->cursor->next;`	281	`db->cursor = db->cursor->next;`
278	`if (db->cursorposy < screenh - 2) {`	282	`if (db->cursorposy < screenh - 2) {`
279	`db->cursorposy += 1;`	283	`db->cursorposy += 1;`
280	`} else {`	284	`} else {`
281	`*uidirtyfrom = 0;`	285	`*uidirtyfrom = 0;`
282	`*uidirtyto = 0xff;`	286	`*uidirtyto = 0xff;`
283	`}`	287	`}`
284	`}`	288	`}`
285	`}`	289	`}`
286		290
287		291
288	`static void cursor_left(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	292	`static void cursor_left(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
289	`if (db->cursorposx > 0) {`	293	`if (db->cursorposx > 0) {`
290	`db->cursorposx -= 1;`	294	`db->cursorposx -= 1;`
291	`} else if (db->xoffset > 0) {`	295	`} else if (db->xoffset > 0) {`
292	`db->xoffset -= 1;`	296	`db->xoffset -= 1;`
293	`*uidirtyfrom = 0;`	297	`*uidirtyfrom = 0;`
294	`*uidirtyto = 0xff;`	298	`*uidirtyto = 0xff;`
295	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`	299	`} else if (db->cursor->prev != NULL) { /* jump to end of line above */`
296	`cursor_up(db, uidirtyfrom, uidirtyto);`	300	`cursor_up(db, uidirtyfrom, uidirtyto);`
297	`cursor_eol(db, screenw, uidirtyfrom, uidirtyto);`	301	`cursor_eol(db, screenw, uidirtyfrom, uidirtyto);`
298	`}`	302	`}`
299	`}`	303	`}`
300		304
301		305
302	`static void cursor_home(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	306	`static void cursor_home(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
303	`db->cursorposx = 0;`	307	`db->cursorposx = 0;`
304	`if (db->xoffset != 0) {`	308	`if (db->xoffset != 0) {`
305	`db->xoffset = 0;`	309	`db->xoffset = 0;`
306	`*uidirtyfrom = 0;`	310	`*uidirtyfrom = 0;`
307	`*uidirtyto = 0xff;`	311	`*uidirtyto = 0xff;`
308	`}`	312	`}`
309	`}`	313	`}`
310		314
311		315
312	`static void cursor_right(struct file db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	316	`static void cursor_right(struct file db, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
313	`if (db->cursor->len > db->xoffset + db->cursorposx) {`	317	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
314	`if (db->cursorposx < screenw - 2) {`	318	`if (db->cursorposx < screenw - 2) {`
315	`db->cursorposx += 1;`	319	`db->cursorposx += 1;`
316	`} else {`	320	`} else {`
317	`db->xoffset += 1;`	321	`db->xoffset += 1;`
318	`*uidirtyfrom = 0;`	322	`*uidirtyfrom = 0;`
319	`*uidirtyto = 0xff;`	323	`*uidirtyto = 0xff;`
320	`}`	324	`}`
321	`} else {`	325	`} else {`
322	`cursor_down(db, screenh, uidirtyfrom, uidirtyto);`	326	`cursor_down(db, screenh, uidirtyfrom, uidirtyto);`
323	`cursor_home(db, uidirtyfrom, uidirtyto);`	327	`cursor_home(db, uidirtyfrom, uidirtyto);`
324	`}`	328	`}`
325	`}`	329	`}`
326		330
327		331
328	`static void del(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	332	`static void del(struct file db, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
329	`if (db->cursorposx + db->xoffset < db->cursor->len) {`	333	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
330	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`	334	`_fmemmove(db->cursor->payload + db->cursorposx + db->xoffset, db->cursor->payload + db->cursorposx + db->xoffset + 1, db->cursor->len - db->cursorposx - db->xoffset);`
331	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`	335	`db->cursor->len -= 1; /* do this AFTER memmove so the copy includes the nul terminator */`
332	`*uidirtyfrom = db->cursorposy;`	336	`*uidirtyfrom = db->cursorposy;`
333	`*uidirtyto = db->cursorposy;`	337	`*uidirtyto = db->cursorposy;`
334	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`	338	`} else if (db->cursor->next != NULL) { /* cursor is at end of line: merge current line with next one (if there is a next one) */`
335	`struct line far *nextline = db->cursor->next;`	339	`struct line far *nextline = db->cursor->next;`
336	`if (db->cursor->next->len > 0) {`	340	`if (db->cursor->next->len > 0) {`
337	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`	341	`void far *newptr = _frealloc(db->cursor, sizeof(struct line) + db->cursor->len + db->cursor->next->len + 1);`
338	`if (newptr != NULL) {`	342	`if (newptr != NULL) {`
339	`db->cursor = newptr;`	343	`db->cursor = newptr;`
340	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`	344	`_fmemcpy(db->cursor->payload + db->cursor->len, db->cursor->next->payload, db->cursor->next->len + 1);`
341	`db->cursor->len += db->cursor->next->len;`	345	`db->cursor->len += db->cursor->next->len;`
342	`}`	346	`}`
343	`}`	347	`}`
344	`db->cursor->next = db->cursor->next->next;`	348	`db->cursor->next = db->cursor->next->next;`
345	`db->cursor->next->prev = db->cursor;`	349	`db->cursor->next->prev = db->cursor;`
346	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`	350	`if (db->cursor->prev != NULL) db->cursor->prev->next = db->cursor; /* in case realloc changed my pointer */`
347	`_ffree(nextline);`	351	`_ffree(nextline);`
348	`*uidirtyfrom = db->cursorposy;`	352	`*uidirtyfrom = db->cursorposy;`
349	`*uidirtyto = 0xff;`	353	`*uidirtyto = 0xff;`
350	`}`	354	`}`
351	`}`	355	`}`
352		356
353		357
354	`static void bkspc(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`	358	`static void bkspc(struct file db, unsigned char screenw, unsigned char uidirtyfrom, unsigned char *uidirtyto) {`
355		359
356	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`	360	`/* backspace is basically "left + del", not applicable only if cursor is on 1st byte of the file */`
357	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`	361	`if ((db->cursorposx == 0) && (db->xoffset == 0) && (db->cursor->prev == NULL)) return;`
358		362
359	`cursor_left(db, screenw, uidirtyfrom, uidirtyto);`	363	`cursor_left(db, screenw, uidirtyfrom, uidirtyto);`
360	`del(db, uidirtyfrom, uidirtyto);`	364	`del(db, uidirtyfrom, uidirtyto);`
361	`}`	365	`}`
362		366
363		367
364	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`	368	`/* a custom argv-parsing routine that looks directly inside the PSP, avoids the need`
365	`* of argc and argv, saves some 330 bytes of binary size */`	369	`* of argc and argv, saves some 330 bytes of binary size */`
366	`static char *parseargv(void) {`	370	`static char *parseargv(void) {`
367	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	371	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
368	`unsigned char count = 0;`	372	`unsigned char count = 0;`
369	`char *argv[4];`	373	`char *argv[4];`
370		374
371	`while (count < 4) {`	375	`while (count < 4) {`
372	`/* jump to nearest arg */`	376	`/* jump to nearest arg */`
373	`while (*tail == ' ') {`	377	`while (*tail == ' ') {`
374	`*tail = 0;`	378	`*tail = 0;`
375	`tail++;`	379	`tail++;`
376	`}`	380	`}`
377		381
378	`if (*tail == '\r') {`	382	`if (*tail == '\r') {`
379	`*tail = 0;`	383	`*tail = 0;`
380	`break;`	384	`break;`
381	`}`	385	`}`
382		386
383	`argv[count++] = tail;`	387	`argv[count++] = tail;`
384		388
385	`/* jump to next delimiter */`	389	`/* jump to next delimiter */`
386	`while ((tail != ' ') && (tail != '\r')) tail++;`	390	`while ((tail != ' ') && (tail != '\r')) tail++;`
387	`}`	391	`}`
388		392
389	`/* check args now */`	393	`/* check args now */`
390	`if (count == 0) return("");`	394	`if (count == 0) return("");`
391		395
392	`return(argv[0]);`	396	`return(argv[0]);`
393	`}`	397	`}`
394		398
395		399
396	`static struct file loadfile(const char fname) {`	400	`static struct file loadfile(const char fname) {`
397	`char buff[1024];`	401	`char buff[1024];`
398	`unsigned int prevlen = 0, len, llen;`	402	`unsigned int prevlen = 0, len, llen;`
399	`int fd;`	403	`int fd;`
400	`struct file *db;`	404	`struct file *db;`
401		405
402	`len = strlen(fname) + 1;`	406	`len = strlen(fname) + 1;`
403	`db = calloc(1, sizeof(struct file) + len);`	407	`db = calloc(1, sizeof(struct file) + len);`
404	`if (db == NULL) return(NULL);`	408	`if (db == NULL) return(NULL);`
405	`memcpy(db->fname, fname, len);`	409	`memcpy(db->fname, fname, len);`
406		410
407	`if (*fname == 0) goto SKIPLOADING;`	411	`if (*fname == 0) goto SKIPLOADING;`
408		412
409	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	413	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
410	`mdr_coutraw_puts("Failed to open file:");`	414	`mdr_coutraw_puts("Failed to open file:");`
411	`mdr_coutraw_puts(fname);`	415	`mdr_coutraw_puts(fname);`
412	`free(db);`	416	`free(db);`
413	`return(NULL);`	417	`return(NULL);`
414	`}`	418	`}`
415		419
416	`db->lfonly = 1;`	420	`db->lfonly = 1;`
417		421
418	`do {`	422	`do {`
419	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`	423	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`
420	`len += prevlen;`	424	`len += prevlen;`
421	`} else {`	425	`} else {`
422	`len = prevlen;`	426	`len = prevlen;`
423	`}`	427	`}`
424		428
425	`/* look for nearest \n and replace with 0*/`	429	`/* look for nearest \n and replace with 0*/`
426	`for (llen = 0; buff[llen] != '\n'; llen++) {`	430	`for (llen = 0; buff[llen] != '\n'; llen++) {`
427	`if (llen == sizeof(buff)) { /* TODO line too long: handle it in some classy way */`	431	`if (llen == sizeof(buff)) { /* TODO line too long: handle it in some classy way */`
428	`break;`	432	`break;`
429	`}`	433	`}`
430	`}`	434	`}`
431	`buff[llen] = 0;`	435	`buff[llen] = 0;`
432	`if ((llen > 0) && (buff[llen - 1] == '\r')) {`	436	`if ((llen > 0) && (buff[llen - 1] == '\r')) {`
433	`buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`	437	`buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`
434	`db->lfonly = 0;`	438	`db->lfonly = 0;`
435	`}`	439	`}`
436	`if (line_add(db, buff) != 0) {`	440	`if (line_add(db, buff) != 0) {`
437	`mdr_coutraw_puts("out of memory");`	441	`mdr_coutraw_puts("out of memory");`
438	`free(db);`	442	`free(db);`
439	`db = NULL;`	443	`db = NULL;`
440	`break;`	444	`break;`
441	`}`	445	`}`
442		446
443	`len -= llen + 1;`	447	`len -= llen + 1;`
444	`memmove(buff, buff + llen + 1, len);`	448	`memmove(buff, buff + llen + 1, len);`
445	`prevlen = len;`	449	`prevlen = len;`
446	`} while (len > 0);`	450	`} while (len > 0);`
447		451
448	`_dos_close(fd);`	452	`_dos_close(fd);`
449		453
450	`SKIPLOADING:`	454	`SKIPLOADING:`
451		455
452	`/* add an empty line at end if not present already, also rewind cursor to top of file */`	456	`/* add an empty line at end if not present already, also rewind cursor to top of file */`
453	`if (db != NULL) {`	457	`if (db != NULL) {`
454	`if ((db->cursor == NULL) \|\| (db->cursor->len != 0)) line_add(db, "");`	458	`if ((db->cursor == NULL) \|\| (db->cursor->len != 0)) line_add(db, "");`
455	`db_rewind(db);`	459	`db_rewind(db);`
456	`}`	460	`}`
457		461
458	`return(db);`	462	`return(db);`
459	`}`	463	`}`
460		464
461		465
462	`static int savefile(const struct file *db) {`	466	`static int savefile(const struct file *db) {`
463	`int fd;`	467	`int fd;`
464	`const struct line far *l;`	468	`const struct line far *l;`
465	`unsigned bytes;`	469	`unsigned bytes;`
466	`unsigned char eollen;`	470	`unsigned char eollen;`
467	`unsigned char eolbuf[2];`	471	`unsigned char eolbuf[2];`
468		472
469	`if (_dos_open(db->fname, O_WRONLY, &fd) != 0) {`	473	`if (_dos_open(db->fname, O_WRONLY, &fd) != 0) {`
470	`return(-1);`	474	`return(-1);`
471	`}`	475	`}`
472		476
473	`l = db->cursor;`	477	`l = db->cursor;`
474	`while (l->prev) l = l->prev;`	478	`while (l->prev) l = l->prev;`
475		479
476	`/* preset line terminators */`	480	`/* preset line terminators */`
477	`if (db->lfonly) {`	481	`if (db->lfonly) {`
478	`eolbuf[0] = '\n';`	482	`eolbuf[0] = '\n';`
479	`eollen = 1;`	483	`eollen = 1;`
480	`} else {`	484	`} else {`
481	`eolbuf[0] = '\r';`	485	`eolbuf[0] = '\r';`
482	`eolbuf[1] = '\n';`	486	`eolbuf[1] = '\n';`
483	`eollen = 2;`	487	`eollen = 2;`
484	`}`	488	`}`
485		489
486	`while (l) {`	490	`while (l) {`
487	`_dos_write(fd, l->payload, l->len, &bytes);`	491	`_dos_write(fd, l->payload, l->len, &bytes);`
488	`_dos_write(fd, eolbuf, eollen, &bytes);`	492	`_dos_write(fd, eolbuf, eollen, &bytes);`
489	`l = l->next;`	493	`l = l->next;`
490	`}`	494	`}`
491		495
492	`_dos_close(fd);`	496	`_dos_close(fd);`
493	`return(0);`	497	`return(0);`
494	`}`	498	`}`
495		499
496		500

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1552 – Rev 1321 → 1322