Fossil

    Blob fname;
    blob_zero(&fname);
    if( g.zLocalRoot!=0 ){
      file_relative_name(g.zLocalRoot, &fname, 1);
      zFile = db_text(0, "SELECT '%qci-comment-'||hex(randomblob(6))||'.txt'",
                      blob_str(&fname));
    }else{
      file_tempname(&fname, "ci-comment",0);
      zFile = mprintf("%s", blob_str(&fname));
    }
    blob_reset(&fname);
  }
#if defined(_WIN32)
  blob_add_cr(pPrompt);
#endif

        return;
      }
      blob_reset(&file2);
    }

    /* Construct a temporary file to hold pFile1 based on the name of
    ** zFile2 */
    file_tempname(&nameFile1, zFile2, "orig");
    blob_write_to_file(pFile1, blob_str(&nameFile1));

    /* Construct the external diff command */
    blob_zero(&cmd);
    blob_append(&cmd, zDiffCmd, -1);
    if( fSwapDiff ){
      blob_append_escaped_arg(&cmd, zFile2);

    /* Release memory resources */
    blob_reset(&out);
  }else{
    Blob cmd;
    Blob temp1;
    Blob temp2;



    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);
      }
    }







    /* Construct a temporary file names */
    file_tempname(&temp1, zName, "before");
    file_tempname(&temp2, zName, "after");
    blob_write_to_file(pFile1, blob_str(&temp1));
    blob_write_to_file(pFile2, blob_str(&temp2));

    /* Construct the external diff command */
    blob_zero(&cmd);
    blob_append(&cmd, zDiffCmd, -1);
    blob_append_escaped_arg(&cmd, blob_str(&temp1));
    blob_append_escaped_arg(&cmd, blob_str(&temp2));

    /* Run the external diff command */
    fossil_system(blob_str(&cmd));

    /* Delete the temporary file and clean up memory used */
    file_delete(blob_str(&temp1));
    file_delete(blob_str(&temp2));



    blob_reset(&temp1);
    blob_reset(&temp2);
    blob_reset(&cmd);
  }
}

/*

}

/*
** Construct a random temporary filename into pBuf where the name of
** the temporary file is derived from zBasis.  The suffix on the temp
** file is the same as the suffix on zBasis, and the temp file has
** the root of zBasis in its name.
**
** If zTag is not NULL, then try to create the temp-file using zTag
** as a differentiator.  If that fails, or if zTag is NULL, then use
** a bunch of random characters as the tag.
*/
void file_tempname(Blob *pBuf, const char *zBasis, const char *zTag){
#if defined(_WIN32)
  const char *azDirs[] = {
     0, /* GetTempPath */
     0, /* TEMP */
     0, /* TMP */
     ".",
  };

  if( nBasis==0 ){
    nBasis = 6;
    zBasis = "fossil";
  }
  do{
    blob_zero(pBuf);
    if( cnt++>20 ) fossil_panic("cannot generate a temporary filename");
    if( zTag==0 ){
      sqlite3_randomness(15, zRand);
      for(i=0; i<15; i++){
        zRand[i] = (char)zChars[ ((unsigned char)zRand[i])%(sizeof(zChars)-1) ];
      }
      zRand[15] = 0;
      zTag = zRand;
    }
    blob_appendf(pBuf, "%s/%.*s~%s%s", zDir, nBasis, zBasis, zTag, zSuffix);
    zTag = 0;
  }while( file_size(blob_str(pBuf), ExtFILE)>=0 );

#if defined(_WIN32)
  fossil_path_free((char *)azDirs[0]);
  fossil_path_free((char *)azDirs[1]);
  fossil_path_free((char *)azDirs[2]);
  /* Change all \ characters in the windows path into / so that they can

      zDir, tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
            tm->tm_hour, tm->tm_min, tm->tm_sec, cnt++, r%1000000, zSuffix);
}


/*
** COMMAND: test-tempname
** Usage:  fossil test-name [--time SUFFIX] [--tag NAME] BASENAME ...
**
** Generate temporary filenames derived from BASENAME.  Use the --time
** option to generate temp names based on the time of day.  If --tag NAME
** is specified, try to use NAME as the differentiator in the temp file.
*/
void file_test_tempname(void){
  int i;
  const char *zSuffix = find_option("time",0,1);
  Blob x = BLOB_INITIALIZER;
  char *z;
  const char *zTag = find_option("tag",0,1);
  verify_all_options();
  for(i=2; i<g.argc; i++){
    if( zSuffix ){
      z = file_time_tempname(g.argv[i], zSuffix);
      fossil_print("%s\n", z);
      fossil_free(z);
    }else{
      file_tempname(&x, g.argv[i], zTag);
      fossil_print("%s\n", blob_str(&x));
      blob_reset(&x);
    }
  }
}

      zFullOldPath = db_text(0,"SELECT tmpfn FROM tmprn WHERE fn=%Q", zOldName);
      if( !zFullOldPath ){
        zFullOldPath = mprintf("%s%s", g.zLocalRoot, zOldName);
      }
      zFullNewPath = mprintf("%s%s", g.zLocalRoot, zNewName);
      if( file_size(zFullNewPath, RepoFILE)>=0 ){
        Blob tmpPath;
        file_tempname(&tmpPath, "", 0);
        db_multi_exec("INSERT INTO tmprn(fn,tmpfn) VALUES(%Q,%Q)",
                      zNewName, blob_str(&tmpPath));
        if( file_islink(zFullNewPath) ){
          symlink_copy(zFullNewPath, blob_str(&tmpPath));
        }else{
          file_copy(zFullNewPath, blob_str(&tmpPath));
        }