int cnt = 0;
    Blob nameFile1;    /* Name of temporary file to old pFile1 content */
    Blob cmd;          /* Text of command to run */

    if( !fIncludeBinary ){
      Blob file2;
      if( isBin1 ){
        fossil_print("%s",DIFF_CANNOT_COMPUTE_BINARY);
        return;
      }
      if( zBinGlob ){
        Glob *pBinary = glob_create(zBinGlob);
        if( glob_match(pBinary, zName) ){
          fossil_print("%s",DIFF_CANNOT_COMPUTE_BINARY);
          glob_free(pBinary);
          return;
        }
        glob_free(pBinary);
      }
      blob_zero(&file2);
      if( file_wd_size(zFile2)>=0 ){
        if( file_wd_islink(zFile2) ){
          blob_read_link(&file2, zFile2);
        }else{
          blob_read_from_file(&file2, zFile2);
        }
      }
      if( looks_like_binary(&file2) ){
        fossil_print("%s",DIFF_CANNOT_COMPUTE_BINARY);
        blob_reset(&file2);
        return;
      }
      blob_reset(&file2);
    }

    /* Construct a temporary file to hold pFile1 based on the name of

  }else{
    Blob cmd;
    char zTemp1[300];
    char zTemp2[300];

    if( !fIncludeBinary ){
      if( isBin1 || isBin2 ){
        fossil_print("%s",DIFF_CANNOT_COMPUTE_BINARY);
        return;
      }
      if( zBinGlob ){
        Glob *pBinary = glob_create(zBinGlob);
        if( glob_match(pBinary, zName) ){
          fossil_print("%s",DIFF_CANNOT_COMPUTE_BINARY);
          glob_free(pBinary);
          return;
        }
        glob_free(pBinary);
      }
    }

  Blob content;
  int isLink;
  int isBin;
  file_tree_name(zFileTreeName, &fname, 1);
  historical_version_of_file(zFrom, blob_str(&fname), &content, &isLink, 0,
                             fIncludeBinary ? 0 : &isBin, 0);
  if( !isLink != !file_wd_islink(zFrom) ){
    fossil_print("%s",DIFF_CANNOT_COMPUTE_SYMLINK);
  }else{
    diff_file(&content, isBin, zFileTreeName, zFileTreeName,
              zDiffCmd, zBinGlob, fIncludeBinary, diffFlags);
  }
  blob_reset(&content);
  blob_reset(&fname);
}

  db_begin_transaction();
  if( zFrom ){
    int rid = name_to_typed_rid(zFrom, "ci");
    if( !is_a_version(rid) ){
      fossil_fatal("no such check-in: %s", zFrom);
    }
    load_vfile_from_rid(rid);
    blob_append_sql(&sql,
      "SELECT v2.pathname, v2.deleted, v2.chnged, v2.rid==0, v1.rid, v1.islink"
      "  FROM vfile v1, vfile v2 "
      " WHERE v1.pathname=v2.pathname AND v1.vid=%d AND v2.vid=%d"
      "   AND (v2.deleted OR v2.chnged OR v1.mrid!=v2.rid)"
      "UNION "
      "SELECT pathname, 1, 0, 0, 0, islink"
      "  FROM vfile v1"
      " WHERE v1.vid=%d"
      "   AND NOT EXISTS(SELECT 1 FROM vfile v2"
                        " WHERE v2.vid=%d AND v2.pathname=v1.pathname)"
      "UNION "
      "SELECT pathname, 0, 0, 1, 0, islink"
      "  FROM vfile v2"
      " WHERE v2.vid=%d"
      "   AND NOT EXISTS(SELECT 1 FROM vfile v1"
                        " WHERE v1.vid=%d AND v1.pathname=v2.pathname)"
      " ORDER BY 1",
      rid, vid, rid, vid, vid, rid
    );
  }else{
    blob_append_sql(&sql,
      "SELECT pathname, deleted, chnged , rid==0, rid, islink"
      "  FROM vfile"
      " WHERE vid=%d"
      "   AND (deleted OR chnged OR rid==0)"
      " ORDER BY pathname",
      vid
    );
  }
  db_prepare(&q, "%s", blob_sql_text(&sql));
  while( db_step(&q)==SQLITE_ROW ){
    const char *zPathname = db_column_text(&q,0);
    int isDeleted = db_column_int(&q, 1);
    int isChnged = db_column_int(&q,2);
    int isNew = db_column_int(&q,3);
    int srcid = db_column_int(&q, 4);
    int isLink = db_column_int(&q, 5);

    }
    if( showDiff ){
      Blob content;
      int isBin;
      if( !isLink != !file_wd_islink(zFullName) ){
        diff_print_index(zPathname, diffFlags);
        diff_print_filenames(zPathname, zPathname, diffFlags);
        fossil_print("%s",DIFF_CANNOT_COMPUTE_SYMLINK);
        continue;
      }
      if( srcid>0 ){
        content_get(srcid, &content);
      }else{
        blob_zero(&content);
      }

  zName = blob_str(&fname);
  historical_version_of_file(zFrom, zName, &v1, &isLink1, 0,
                             fIncludeBinary ? 0 : &isBin1, 0);
  historical_version_of_file(zTo, zName, &v2, &isLink2, 0,
                             fIncludeBinary ? 0 : &isBin2, 0);
  if( isLink1 != isLink2 ){
    diff_print_filenames(zName, zName, diffFlags);
    fossil_print("%s",DIFF_CANNOT_COMPUTE_SYMLINK);
  }else{
    diff_file_mem(&v1, &v2, isBin1, isBin2, zName, zDiffCmd,
                  zBinGlob, fIncludeBinary, diffFlags);
  }
  blob_reset(&v1);
  blob_reset(&v2);
  blob_reset(&fname);