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, also expand tabs */
    for (llen = 0; buff[llen] != '\n'; llen++) {
      if (buff[llen] == '\t') {
        unsigned char c;
        for (c = 0; c < 8; c++) buff[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 1322	Rev 1323
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`	43	`#define COL_MSG 4`
44	`#define COL_ERR 5`	44	`#define COL_ERR 5`
45	`/* 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) */`
46	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70, 0x70, 0x70};`	46	`static unsigned char scheme[] = {0x07, 0x70, 0x70, 0x70, 0x70, 0x70};`
47		47
48	`#define SCROLL_CURSOR 0xB1`	48	`#define SCROLL_CURSOR 0xB1`
49		49
50		50
51	`struct line {`	51	`struct line {`
52	`struct line far *prev;`	52	`struct line far *prev;`
53	`struct line far *next;`	53	`struct line far *next;`
54	`unsigned short len;`	54	`unsigned short len;`
55	`char payload[1];`	55	`char payload[1];`
56	`};`	56	`};`
57		57
58	`struct file {`	58	`struct file {`
59	`int fd;`	59	`int fd;`
60	`struct line far *cursor;`	60	`struct line far *cursor;`
61	`unsigned short xoffset;`	61	`unsigned short xoffset;`
62	`unsigned char cursorposx;`	62	`unsigned char cursorposx;`
63	`unsigned char cursorposy;`	63	`unsigned char cursorposy;`
64	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`	64	`char lfonly; /* set if line endings are LF (CR/LF otherwise) */`
65	`char fname[1]; /* dynamically sized */`	65	`char fname[1]; /* dynamically sized */`
66	`};`	66	`};`
67		67
68		68
69	`/* returns non-zero on error */`	69	`/* returns non-zero on error */`
70	`static int line_add(struct file db, const char far line) {`	70	`static int line_add(struct file db, const char far line) {`
71	`unsigned short slen;`	71	`unsigned short slen;`
72	`struct line far *l;`	72	`struct line far *l;`
73		73
74	`/* slen = strlen(line) (but for far pointer) */`	74	`/* slen = strlen(line) (but for far pointer) */`
75	`for (slen = 0; line[slen] != 0; slen++);`	75	`for (slen = 0; line[slen] != 0; slen++);`
76		76
77	`/* trim out CR/LF line endings */`	77	`/* trim out CR/LF line endings */`
78	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`	78	`if ((slen >= 2) && (line[slen - 2] == '\r')) {`
79	`slen -= 2;`	79	`slen -= 2;`
80	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`	80	`} else if ((slen >= 1) && (line[slen - 1] == '\n')) {`
81	`slen--;`	81	`slen--;`
82	`}`	82	`}`
83		83
84	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`	84	`l = _fcalloc(1, sizeof(struct line) + slen + 1);`
85	`if (l == NULL) return(-1);`	85	`if (l == NULL) return(-1);`
86		86
87	`l->prev = db->cursor;`	87	`l->prev = db->cursor;`
88	`if (db->cursor) {`	88	`if (db->cursor) {`
89	`l->next = db->cursor->next;`	89	`l->next = db->cursor->next;`
90	`db->cursor->next = l;`	90	`db->cursor->next = l;`
91	`l->next->prev = l;`	91	`l->next->prev = l;`
92	`}`	92	`}`
93	`db->cursor = l;`	93	`db->cursor = l;`
94	`_fmemcpy(l->payload, line, slen);`	94	`_fmemcpy(l->payload, line, slen);`
95	`l->len = slen;`	95	`l->len = slen;`
96		96
97	`return(0);`	97	`return(0);`
98	`}`	98	`}`
99		99
100		100
101	`static void db_rewind(struct file *db) {`	101	`static void db_rewind(struct file *db) {`
102	`if (db->cursor == NULL) return;`	102	`if (db->cursor == NULL) return;`
103	`while (db->cursor->prev) db->cursor = db->cursor->prev;`	103	`while (db->cursor->prev) db->cursor = db->cursor->prev;`
104	`}`	104	`}`
105		105
106		106
107	`static void load_colorscheme(void) {`	107	`static void load_colorscheme(void) {`
108	`scheme[COL_TXT] = 0x17;`	108	`scheme[COL_TXT] = 0x17;`
109	`scheme[COL_STATUSBAR1] = 0x70;`	109	`scheme[COL_STATUSBAR1] = 0x70;`
110	`scheme[COL_STATUSBAR2] = 0x78;`	110	`scheme[COL_STATUSBAR2] = 0x78;`
111	`scheme[COL_SCROLLBAR] = 0x70;`	111	`scheme[COL_SCROLLBAR] = 0x70;`
112	`scheme[COL_MSG] = 0x2f;`	112	`scheme[COL_MSG] = 0x2f;`
113	`scheme[COL_ERR] = 0x4f;`	113	`scheme[COL_ERR] = 0x4f;`
114	`}`	114	`}`
115		115
116		116
117	`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) {`
118	`unsigned char i;`	118	`unsigned char i;`
119	`const char s = svarlang_strid(0); / HELP */`	119	`const char s = svarlang_strid(0); / HELP */`
120	`unsigned char helpcol = screenw - (strlen(s) + 4);`	120	`unsigned char helpcol = screenw - (strlen(s) + 4);`
121		121
122	`/* fill status bar with background */`	122	`/* fill status bar with background */`
123	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`	123	`mdr_cout_char_rep(screenh - 1, 0, ' ', scheme[COL_STATUSBAR1], screenw);`
124		124
125	`/* filename */`	125	`/* filename */`
126	`if (db->fname[0] == 0) {`	126	`if (db->fname[0] == 0) {`
127	`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);`
128	`} else {`	128	`} else {`
129	`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);`
130	`}`	130	`}`
131		131
132	`/* eol type */`	132	`/* eol type */`
133	`if (db->lfonly) {`	133	`if (db->lfonly) {`
134	`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);`
135	`} else {`	135	`} else {`
136	`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);`
137	`}`	137	`}`
138		138
139	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`	139	`mdr_cout_str(screenh - 1, helpcol, " F1=", scheme[COL_STATUSBAR2], 40);`
140	`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);`
141		141
142	`/* scroll bar */`	142	`/* scroll bar */`
143	`for (i = 0; i < (screenh - 1); i++) {`	143	`for (i = 0; i < (screenh - 1); i++) {`
144	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`	144	`mdr_cout_char(i, screenw - 1, SCROLL_CURSOR, scheme[COL_SCROLLBAR]);`
145	`}`	145	`}`
146	`}`	146	`}`
147		147
148		148
149	`static void ui_msg(const char msg, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto, unsigned char attr) {`	149	`static void ui_msg(const char msg, unsigned char screenw, unsigned char screenh, unsigned char uidirtyfrom, unsigned char *uidirtyto, unsigned char attr) {`
150	`unsigned short x, y, msglen, i;`	150	`unsigned short x, y, msglen, i;`
151	`msglen = strlen(msg);`	151	`msglen = strlen(msg);`
152	`y = (screenh - 4) >> 1;`	152	`y = (screenh - 4) >> 1;`
153	`x = (screenw - msglen - 4) >> 1;`	153	`x = (screenw - msglen - 4) >> 1;`
154	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`	154	`for (i = y+2; i >= y; i--) mdr_cout_char_rep(i, x, ' ', attr, msglen + 2);`
155	`mdr_cout_str(y+1, x+1, msg, attr, msglen);`	155	`mdr_cout_str(y+1, x+1, msg, attr, msglen);`
156		156
157	`if (uidirtyfrom > y) uidirtyfrom = y;`	157	`if (uidirtyfrom > y) uidirtyfrom = y;`
158	`if (uidirtyto < y+2) uidirtyto = y+2;`	158	`if (uidirtyto < y+2) uidirtyto = y+2;`
159	`}`	159	`}`
160		160
161		161
162	`static void ui_help(unsigned char screenw) {`	162	`static void ui_help(unsigned char screenw) {`
163	`#define MAXLINLEN 35`	163	`#define MAXLINLEN 35`
164	`unsigned short i, offset;`	164	`unsigned short i, offset;`
165	`offset = (screenw - MAXLINLEN + 1) >> 1;`	165	`offset = (screenw - MAXLINLEN + 1) >> 1;`
166	`mdr_cout_cursor_hide();`	166	`mdr_cout_cursor_hide();`
167	`for (i = 2; i <= 12; i++) {`	167	`for (i = 2; i <= 12; i++) {`
168	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);`	168	`mdr_cout_char_rep(i, offset - 2, ' ', scheme[COL_STATUSBAR1], MAXLINLEN);`
169	`}`	169	`}`
170		170
171	`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);`
172	`for (i = 0; i <= 2; i++) {`	172	`for (i = 0; i <= 2; i++) {`
173	`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);`
174	`}`	174	`}`
175	`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);`
176	`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);`
177		177
178	`keyb_getkey();`	178	`keyb_getkey();`
179	`mdr_cout_cursor_show();`	179	`mdr_cout_cursor_show();`
180	`#undef MAXLINLEN`	180	`#undef MAXLINLEN`
181	`}`	181	`}`
182		182
183		183
184	`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) {`
185	`unsigned char x;`	185	`unsigned char x;`
186	`const struct line far *l;`	186	`const struct line far *l;`
187	`unsigned char y = db->cursorposy;`	187	`unsigned char y = db->cursorposy;`
188		188
189	`#ifdef DBG_REFRESH`	189	`#ifdef DBG_REFRESH`
190	`static char m = 'a';`	190	`static char m = 'a';`
191	`m++;`	191	`m++;`
192	`if (m > 'z') m = 'a';`	192	`if (m > 'z') m = 'a';`
193	`#endif`	193	`#endif`
194		194
195	`/* rewind cursor line to first line that needs redrawing */`	195	`/* rewind cursor line to first line that needs redrawing */`
196	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`	196	`for (l = db->cursor; y > uidirtyfrom; y--) l = l->prev;`
197		197
198	`/* iterate over lines and redraw whatever needs to be redrawn */`	198	`/* iterate over lines and redraw whatever needs to be redrawn */`
199	`for (; l != NULL; l = l->next, y++) {`	199	`for (; l != NULL; l = l->next, y++) {`
200		200
201	`/* skip lines that do not need to be refreshed */`	201	`/* skip lines that do not need to be refreshed */`
202	`if (y < uidirtyfrom) continue;`	202	`if (y < uidirtyfrom) continue;`
203	`if (y > uidirtyto) break;`	203	`if (y > uidirtyto) break;`
204		204
205	`x = 0;`	205	`x = 0;`
206	`if (db->xoffset < l->len) {`	206	`if (db->xoffset < l->len) {`
207	`unsigned char i, limit;`	207	`unsigned char i, limit;`
208	`if (l->len - db->xoffset < screenw) {`	208	`if (l->len - db->xoffset < screenw) {`
209	`limit = l->len;`	209	`limit = l->len;`
210	`} else {`	210	`} else {`
211	`limit = db->xoffset + screenw - 1;`	211	`limit = db->xoffset + screenw - 1;`
212	`}`	212	`}`
213	`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]);`
214	`}`	214	`}`
215		215
216	`/* write empty spaces until end of line */`	216	`/* write empty spaces until end of line */`
217	`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);`
218		218
219	`#ifdef DBG_REFRESH`	219	`#ifdef DBG_REFRESH`
220	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`	220	`mdr_cout_char(y, 0, m, scheme[COL_STATUSBAR1]);`
221	`#endif`	221	`#endif`
222		222
223	`if (y == screenh - 2) break;`	223	`if (y == screenh - 2) break;`
224	`}`	224	`}`
225		225
226	`/* 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) */`
227	`if (l == NULL) {`	227	`if (l == NULL) {`
228	`while ((y < screenh - 1) && (y < uidirtyto)) {`	228	`while ((y < screenh - 1) && (y < uidirtyto)) {`
229	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`	229	`mdr_cout_char_rep(y++, 0, ' ', scheme[COL_TXT], screenw - 1);`
230	`}`	230	`}`
231	`}`	231	`}`
232	`}`	232	`}`
233		233
234		234
235	`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) {`
236	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`	236	`if (db->xoffset + db->cursorposx <= db->cursor->len) return;`
237		237
238	`if (db->cursor->len < db->xoffset) {`	238	`if (db->cursor->len < db->xoffset) {`
239	`db->cursorposx = 0;`	239	`db->cursorposx = 0;`
240	`db->xoffset = db->cursor->len;`	240	`db->xoffset = db->cursor->len;`
241	`*uidirtyfrom = 0;`	241	`*uidirtyfrom = 0;`
242	`*uidirtyto = 0xff;`	242	`*uidirtyto = 0xff;`
243	`} else {`	243	`} else {`
244	`db->cursorposx = db->cursor->len - db->xoffset;`	244	`db->cursorposx = db->cursor->len - db->xoffset;`
245	`}`	245	`}`
246	`}`	246	`}`
247		247
248		248
249	`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) {`
250	`if (db->cursor->prev != NULL) {`	250	`if (db->cursor->prev != NULL) {`
251	`db->cursor = db->cursor->prev;`	251	`db->cursor = db->cursor->prev;`
252	`if (db->cursorposy == 0) {`	252	`if (db->cursorposy == 0) {`
253	`*uidirtyfrom = 0;`	253	`*uidirtyfrom = 0;`
254	`*uidirtyto = 0xff;`	254	`*uidirtyto = 0xff;`
255	`} else {`	255	`} else {`
256	`db->cursorposy -= 1;`	256	`db->cursorposy -= 1;`
257	`}`	257	`}`
258	`}`	258	`}`
259	`}`	259	`}`
260		260
261		261
262	`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) {`
263	`/* adjust xoffset to make sure eol is visible on screen */`	263	`/* adjust xoffset to make sure eol is visible on screen */`
264	`if (db->xoffset > db->cursor->len) {`	264	`if (db->xoffset > db->cursor->len) {`
265	`db->xoffset = db->cursor->len - 1;`	265	`db->xoffset = db->cursor->len - 1;`
266	`*uidirtyfrom = 0;`	266	`*uidirtyfrom = 0;`
267	`*uidirtyto = 0xff;`	267	`*uidirtyto = 0xff;`
268	`}`	268	`}`
269		269
270	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`	270	`if (db->xoffset + screenw - 1 <= db->cursor->len) {`
271	`db->xoffset = db->cursor->len - screenw + 2;`	271	`db->xoffset = db->cursor->len - screenw + 2;`
272	`*uidirtyfrom = 0;`	272	`*uidirtyfrom = 0;`
273	`*uidirtyto = 0xff;`	273	`*uidirtyto = 0xff;`
274	`}`	274	`}`
275	`db->cursorposx = db->cursor->len - db->xoffset;`	275	`db->cursorposx = db->cursor->len - db->xoffset;`
276	`}`	276	`}`
277		277
278		278
279	`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) {`
280	`if (db->cursor->next != NULL) {`	280	`if (db->cursor->next != NULL) {`
281	`db->cursor = db->cursor->next;`	281	`db->cursor = db->cursor->next;`
282	`if (db->cursorposy < screenh - 2) {`	282	`if (db->cursorposy < screenh - 2) {`
283	`db->cursorposy += 1;`	283	`db->cursorposy += 1;`
284	`} else {`	284	`} else {`
285	`*uidirtyfrom = 0;`	285	`*uidirtyfrom = 0;`
286	`*uidirtyto = 0xff;`	286	`*uidirtyto = 0xff;`
287	`}`	287	`}`
288	`}`	288	`}`
289	`}`	289	`}`
290		290
291		291
292	`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) {`
293	`if (db->cursorposx > 0) {`	293	`if (db->cursorposx > 0) {`
294	`db->cursorposx -= 1;`	294	`db->cursorposx -= 1;`
295	`} else if (db->xoffset > 0) {`	295	`} else if (db->xoffset > 0) {`
296	`db->xoffset -= 1;`	296	`db->xoffset -= 1;`
297	`*uidirtyfrom = 0;`	297	`*uidirtyfrom = 0;`
298	`*uidirtyto = 0xff;`	298	`*uidirtyto = 0xff;`
299	`} 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 */`
300	`cursor_up(db, uidirtyfrom, uidirtyto);`	300	`cursor_up(db, uidirtyfrom, uidirtyto);`
301	`cursor_eol(db, screenw, uidirtyfrom, uidirtyto);`	301	`cursor_eol(db, screenw, uidirtyfrom, uidirtyto);`
302	`}`	302	`}`
303	`}`	303	`}`
304		304
305		305
306	`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) {`
307	`db->cursorposx = 0;`	307	`db->cursorposx = 0;`
308	`if (db->xoffset != 0) {`	308	`if (db->xoffset != 0) {`
309	`db->xoffset = 0;`	309	`db->xoffset = 0;`
310	`*uidirtyfrom = 0;`	310	`*uidirtyfrom = 0;`
311	`*uidirtyto = 0xff;`	311	`*uidirtyto = 0xff;`
312	`}`	312	`}`
313	`}`	313	`}`
314		314
315		315
316	`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) {`
317	`if (db->cursor->len > db->xoffset + db->cursorposx) {`	317	`if (db->cursor->len > db->xoffset + db->cursorposx) {`
318	`if (db->cursorposx < screenw - 2) {`	318	`if (db->cursorposx < screenw - 2) {`
319	`db->cursorposx += 1;`	319	`db->cursorposx += 1;`
320	`} else {`	320	`} else {`
321	`db->xoffset += 1;`	321	`db->xoffset += 1;`
322	`*uidirtyfrom = 0;`	322	`*uidirtyfrom = 0;`
323	`*uidirtyto = 0xff;`	323	`*uidirtyto = 0xff;`
324	`}`	324	`}`
325	`} else {`	325	`} else {`
326	`cursor_down(db, screenh, uidirtyfrom, uidirtyto);`	326	`cursor_down(db, screenh, uidirtyfrom, uidirtyto);`
327	`cursor_home(db, uidirtyfrom, uidirtyto);`	327	`cursor_home(db, uidirtyfrom, uidirtyto);`
328	`}`	328	`}`
329	`}`	329	`}`
330		330
331		331
332	`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) {`
333	`if (db->cursorposx + db->xoffset < db->cursor->len) {`	333	`if (db->cursorposx + db->xoffset < db->cursor->len) {`
334	`_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);`
335	`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 */`
336	`*uidirtyfrom = db->cursorposy;`	336	`*uidirtyfrom = db->cursorposy;`
337	`*uidirtyto = db->cursorposy;`	337	`*uidirtyto = db->cursorposy;`
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) */`	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) */`
339	`struct line far *nextline = db->cursor->next;`	339	`struct line far *nextline = db->cursor->next;`
340	`if (db->cursor->next->len > 0) {`	340	`if (db->cursor->next->len > 0) {`
341	`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);`
342	`if (newptr != NULL) {`	342	`if (newptr != NULL) {`
343	`db->cursor = newptr;`	343	`db->cursor = newptr;`
344	`_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);`
345	`db->cursor->len += db->cursor->next->len;`	345	`db->cursor->len += db->cursor->next->len;`
346	`}`	346	`}`
347	`}`	347	`}`
348	`db->cursor->next = db->cursor->next->next;`	348	`db->cursor->next = db->cursor->next->next;`
349	`db->cursor->next->prev = db->cursor;`	349	`db->cursor->next->prev = db->cursor;`
350	`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 */`
351	`_ffree(nextline);`	351	`_ffree(nextline);`
352	`*uidirtyfrom = db->cursorposy;`	352	`*uidirtyfrom = db->cursorposy;`
353	`*uidirtyto = 0xff;`	353	`*uidirtyto = 0xff;`
354	`}`	354	`}`
355	`}`	355	`}`
356		356
357		357
358	`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) {`
359		359
360	`/* 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 */`
361	`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;`
362		362
363	`cursor_left(db, screenw, uidirtyfrom, uidirtyto);`	363	`cursor_left(db, screenw, uidirtyfrom, uidirtyto);`
364	`del(db, uidirtyfrom, uidirtyto);`	364	`del(db, uidirtyfrom, uidirtyto);`
365	`}`	365	`}`
366		366
367		367
368	`/* 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`
369	`* of argc and argv, saves some 330 bytes of binary size */`	369	`* of argc and argv, saves some 330 bytes of binary size */`
370	`static char *parseargv(void) {`	370	`static char *parseargv(void) {`
371	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`	371	`char tail = (void )0x81; /* THIS WORKS ONLY IN SMALL MEMORY MODEL */`
372	`unsigned char count = 0;`	372	`unsigned char count = 0;`
373	`char *argv[4];`	373	`char *argv[4];`
374		374
375	`while (count < 4) {`	375	`while (count < 4) {`
376	`/* jump to nearest arg */`	376	`/* jump to nearest arg */`
377	`while (*tail == ' ') {`	377	`while (*tail == ' ') {`
378	`*tail = 0;`	378	`*tail = 0;`
379	`tail++;`	379	`tail++;`
380	`}`	380	`}`
381		381
382	`if (*tail == '\r') {`	382	`if (*tail == '\r') {`
383	`*tail = 0;`	383	`*tail = 0;`
384	`break;`	384	`break;`
385	`}`	385	`}`
386		386
387	`argv[count++] = tail;`	387	`argv[count++] = tail;`
388		388
389	`/* jump to next delimiter */`	389	`/* jump to next delimiter */`
390	`while ((tail != ' ') && (tail != '\r')) tail++;`	390	`while ((tail != ' ') && (tail != '\r')) tail++;`
391	`}`	391	`}`
392		392
393	`/* check args now */`	393	`/* check args now */`
394	`if (count == 0) return("");`	394	`if (count == 0) return("");`
395		395
396	`return(argv[0]);`	396	`return(argv[0]);`
397	`}`	397	`}`
398		398
399		399
400	`static struct file loadfile(const char fname) {`	400	`static struct file loadfile(const char fname) {`
401	`char buff[1024];`	401	`char buff[1024];`
402	`unsigned int prevlen = 0, len, llen;`	402	`unsigned int prevlen = 0, len, llen;`
403	`int fd;`	403	`int fd;`
404	`struct file *db;`	404	`struct file *db;`
405		405
406	`len = strlen(fname) + 1;`	406	`len = strlen(fname) + 1;`
407	`db = calloc(1, sizeof(struct file) + len);`	407	`db = calloc(1, sizeof(struct file) + len);`
408	`if (db == NULL) return(NULL);`	408	`if (db == NULL) return(NULL);`
409	`memcpy(db->fname, fname, len);`	409	`memcpy(db->fname, fname, len);`
410		410
411	`if (*fname == 0) goto SKIPLOADING;`	411	`if (*fname == 0) goto SKIPLOADING;`
412		412
413	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`	413	`if (_dos_open(fname, O_RDONLY, &fd) != 0) {`
414	`mdr_coutraw_puts("Failed to open file:");`	414	`mdr_coutraw_puts("Failed to open file:");`
415	`mdr_coutraw_puts(fname);`	415	`mdr_coutraw_puts(fname);`
416	`free(db);`	416	`free(db);`
417	`return(NULL);`	417	`return(NULL);`
418	`}`	418	`}`
419		419
420	`db->lfonly = 1;`	420	`db->lfonly = 1;`
421		421
422	`do {`	422	`do {`
423	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`	423	`if (_dos_read(fd, buff + prevlen, sizeof(buff) - prevlen, &len) == 0) {`
424	`len += prevlen;`	424	`len += prevlen;`
425	`} else {`	425	`} else {`
426	`len = prevlen;`	426	`len = prevlen;`
427	`}`	427	`}`
428		428
429	`/* look for nearest \n and replace with 0*/`	429	`/* look for nearest \n and replace with 0, also expand tabs */`
430	`for (llen = 0; buff[llen] != '\n'; llen++) {`	430	`for (llen = 0; buff[llen] != '\n'; llen++) {`
-		431	`if (buff[llen] == '\t') {`
-		432	`unsigned char c;`
-		433	`for (c = 0; c < 8; c++) buff[llen++] = ' ';`
-		434	`}`
431	`if (llen == sizeof(buff)) { /* TODO line too long: handle it in some classy way */`	435	`if (llen == sizeof(buff)) { /* TODO line too long: handle it in some classy way */`
432	`break;`	436	`break;`
433	`}`	437	`}`
434	`}`	438	`}`
435	`buff[llen] = 0;`	439	`buff[llen] = 0;`
436	`if ((llen > 0) && (buff[llen - 1] == '\r')) {`	440	`if ((llen > 0) && (buff[llen - 1] == '\r')) {`
437	`buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`	441	`buff[llen - 1] = 0; /* trim \r if line ending is cr/lf */`
438	`db->lfonly = 0;`	442	`db->lfonly = 0;`
439	`}`	443	`}`
440	`if (line_add(db, buff) != 0) {`	444	`if (line_add(db, buff) != 0) {`
441	`mdr_coutraw_puts("out of memory");`	445	`mdr_coutraw_puts("out of memory");`
442	`free(db);`	446	`free(db);`
443	`db = NULL;`	447	`db = NULL;`
444	`break;`	448	`break;`
445	`}`	449	`}`
446		450
447	`len -= llen + 1;`	451	`len -= llen + 1;`
448	`memmove(buff, buff + llen + 1, len);`	452	`memmove(buff, buff + llen + 1, len);`
449	`prevlen = len;`	453	`prevlen = len;`
450	`} while (len > 0);`	454	`} while (len > 0);`
451		455
452	`_dos_close(fd);`	456	`_dos_close(fd);`
453		457
454	`SKIPLOADING:`	458	`SKIPLOADING:`
455		459
456	`/* add an empty line at end if not present already, also rewind cursor to top of file */`	460	`/* add an empty line at end if not present already, also rewind cursor to top of file */`
457	`if (db != NULL) {`	461	`if (db != NULL) {`
458	`if ((db->cursor == NULL) \|\| (db->cursor->len != 0)) line_add(db, "");`	462	`if ((db->cursor == NULL) \|\| (db->cursor->len != 0)) line_add(db, "");`
459	`db_rewind(db);`	463	`db_rewind(db);`
460	`}`	464	`}`
461		465
462	`return(db);`	466	`return(db);`
463	`}`	467	`}`
464		468
465		469
466	`static int savefile(const struct file *db) {`	470	`static int savefile(const struct file *db) {`
467	`int fd;`	471	`int fd;`
468	`const struct line far *l;`	472	`const struct line far *l;`
469	`unsigned bytes;`	473	`unsigned bytes;`
470	`unsigned char eollen;`	474	`unsigned char eollen;`
471	`unsigned char eolbuf[2];`	475	`unsigned char eolbuf[2];`
472		476
473	`if (_dos_open(db->fname, O_WRONLY, &fd) != 0) {`	477	`if (_dos_open(db->fname, O_WRONLY, &fd) != 0) {`
474	`return(-1);`	478	`return(-1);`
475	`}`	479	`}`
476		480
477	`l = db->cursor;`	481	`l = db->cursor;`
478	`while (l->prev) l = l->prev;`	482	`while (l->prev) l = l->prev;`
479		483
480	`/* preset line terminators */`	484	`/* preset line terminators */`
481	`if (db->lfonly) {`	485	`if (db->lfonly) {`
482	`eolbuf[0] = '\n';`	486	`eolbuf[0] = '\n';`
483	`eollen = 1;`	487	`eollen = 1;`
484	`} else {`	488	`} else {`
485	`eolbuf[0] = '\r';`	489	`eolbuf[0] = '\r';`
486	`eolbuf[1] = '\n';`	490	`eolbuf[1] = '\n';`
487	`eollen = 2;`	491	`eollen = 2;`
488	`}`	492	`}`
489		493
490	`while (l) {`	494	`while (l) {`
491	`_dos_write(fd, l->payload, l->len, &bytes);`	495	`_dos_write(fd, l->payload, l->len, &bytes);`
492	`_dos_write(fd, eolbuf, eollen, &bytes);`	496	`_dos_write(fd, eolbuf, eollen, &bytes);`
493	`l = l->next;`	497	`l = l->next;`
494	`}`	498	`}`
495		499
496	`_dos_close(fd);`	500	`_dos_close(fd);`

Subversion Repositories SvarDOS

(root)/sved/trunk/sved.c @ 1547 – Rev 1322 → 1323