mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-28 23:31:56 +00:00
51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
/* -*- 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_ */
|