src/pagespeed/kernel/base/printf_format.h

/*
 * Copyright 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// Author: bmcquade@google.com (Bryan McQuade)

#ifndef PAGESPEED_KERNEL_BASE_PRINTF_FORMAT_H_
#define PAGESPEED_KERNEL_BASE_PRINTF_FORMAT_H_

#ifdef __GNUC__

// Tell the compiler a function is using a printf-style format string.
// |format_param| is the one-based index of the format string parameter;
// |dots_param| is the one-based index of the "..." parameter.
// For v*printf functions (which take a va_list), pass 0 for dots_param.
// (This is undocumented but matches what the system C headers do.)
#define INSTAWEB_PRINTF_FORMAT(format_param, dots_param) \
    __attribute__((format(printf, format_param, dots_param)))

#else  // Not GCC

#define INSTAWEB_PRINTF_FORMAT(x, y)

#endif

#endif  // PAGESPEED_KERNEL_BASE_PRINTF_FORMAT_H_