File: Snprintf.h

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/* -*- 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/. */

/* Polyfills snprintf() on platforms that don't provide it, and provides
 * related utilities. */

#ifndef mozilla_Snprintf_h_
#define mozilla_Snprintf_h_

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

// Older MSVC versions do not provide snprintf(), but they do provide
// vsnprintf(), which has the same semantics except that if the number of
// characters written equals the buffer size, it does not write a null
// terminator, so we wrap it to do so.
#if defined(_MSC_VER) && _MSC_VER < 1900
#include "mozilla/Attributes.h"
MOZ_ALWAYS_INLINE int snprintf(char* buffer, size_t n, const char* format, ...)
{
  va_list args;
  va_start(args, format);
  int result = vsnprintf(buffer, n, format, args);
  va_end(args);
  buffer[n - 1] = '\0';
  return result;
}
#endif

// In addition, in C++ code, on all platforms, provide an snprintf_literal()
// function which uses template argument deduction to deduce the size of the
// buffer, avoiding the need for the user to pass it in explicitly.
#ifdef __cplusplus
template <size_t N>
int snprintf_literal(char (&buffer)[N], const char* format, ...)
{
  va_list args;
  va_start(args, format);
  int result = vsnprintf(buffer, N, format, args);
  va_end(args);
  buffer[N - 1] = '\0';
  return result;
}
#endif

#endif  /* mozilla_Snprintf_h_ */