mfbt/Sprintf.h
author Tom Tromey <tom@tromey.com>
Wed, 12 Oct 2016 10:03:53 -0600
changeset 345647 65a272de7edaa23804374e6a9d390fe82ed20cbc
parent 345302 cb8a74d6d50080d99f68e45bfe801c2fdef887aa
permissions -rw-r--r--
Bug 553032 - use MOZ_FORMAT_PRINTF, not explicit attribute; r=froydnj MozReview-Commit-ID: FgGin8L5oTp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* Provides a safer sprintf for printing to fixed-size character arrays. */

#ifndef mozilla_Sprintf_h_
#define mozilla_Sprintf_h_

#include <stdio.h>
#include <stdarg.h>

#include "mozilla/Assertions.h"
#include "mozilla/Attributes.h"

#ifdef __cplusplus

template <size_t N>
int VsprintfLiteral(char (&buffer)[N], const char* format, va_list args)
{
    MOZ_ASSERT(format != buffer);
    int result = vsnprintf(buffer, N, format, args);
    buffer[N - 1] = '\0';
    return result;
}

template <size_t N>
MOZ_FORMAT_PRINTF(2, 3)
int SprintfLiteral(char (&buffer)[N], const char* format, ...)
{
  va_list args;
  va_start(args, format);
  int result = VsprintfLiteral(buffer, format, args);
  va_end(args);
  return result;
}

#endif
#endif  /* mozilla_Sprintf_h_ */