blob_reset(&b);
  va_end(ap);
}

/*
** Write a message to the error log, if the error log filename is
** defined.
**
** If the message format begins with 'X', then omit that X from the
** beginning of the message and add much more CGI context.
*/
void fossil_errorlog(const char *zFormat, ...){
  struct tm *pNow;
  time_t now;
  FILE *out;
  const char *z;
  int i;
  int bDetail = 0;
  va_list ap;
  static const char *const azEnv[] = { "HTTP_HOST", "HTTP_REFERER",
      "HTTP_USER_AGENT",
      "PATH_INFO", "QUERY_STRING", "REMOTE_ADDR", "REQUEST_METHOD",
      "REQUEST_URI", "SCRIPT_NAME" };
  if( g.zErrlog==0 ) return;
  if( g.zErrlog[0]=='-' && g.zErrlog[1]==0 ){
    out = stderr;
  }else{
    out = fossil_fopen(g.zErrlog, "a");
    if( out==0 ) return;
  }
  now = time(0);
  pNow = gmtime(&now);
  fprintf(out, "------------- %04d-%02d-%02d %02d:%02d:%02d UTC ------------\n",
          pNow->tm_year+1900, pNow->tm_mon+1, pNow->tm_mday,
          pNow->tm_hour, pNow->tm_min, pNow->tm_sec);
  va_start(ap, zFormat);
  if( zFormat[0]=='X' ){
    bDetail = 1;
    zFormat++;
  }
  vfprintf(out, zFormat, ap);
  fprintf(out, "\n");
  va_end(ap);
  if( bDetail ){
    cgi_print_all(1,3,out);
  }else{
    for(i=0; i<count(azEnv); i++){
      char *p;
      if( (p = fossil_getenv(azEnv[i]))!=0 && p[0]!=0 ){
        fprintf(out, "%s=%s\n", azEnv[i], p);
        fossil_path_free(p);
      }else if( (z = P(azEnv[i]))!=0 && z[0]!=0 ){
        fprintf(out, "%s=%s\n", azEnv[i], z);
      }
    }
  }
  fclose(out);
}

/*
** The following variable becomes true while processing a fatal error