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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 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* Polyfills snprintf() on platforms that don't provide it, and provides
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* related utilities. */
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#ifndef mozilla_Snprintf_h_
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#define mozilla_Snprintf_h_
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#include <stddef.h>
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#include <stdio.h>
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#include <stdarg.h>
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// Older MSVC versions do not provide snprintf(), but they do provide
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// vsnprintf(), which has the same semantics except that if the number of
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// characters written equals the buffer size, it does not write a null
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// terminator, so we wrap it to do so.
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#if defined(_MSC_VER) && _MSC_VER < 1900
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#include "mozilla/Attributes.h"
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MOZ_ALWAYS_INLINE int snprintf(char* buffer, size_t n, const char* format, ...)
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{
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va_list args;
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va_start(args, format);
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int result = vsnprintf(buffer, n, format, args);
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va_end(args);
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buffer[n - 1] = '\0';
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return result;
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}
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#endif
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// In addition, in C++ code, on all platforms, provide an snprintf_literal()
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// function which uses template argument deduction to deduce the size of the
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// buffer, avoiding the need for the user to pass it in explicitly.
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#ifdef __cplusplus
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template <size_t N>
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int snprintf_literal(char (&buffer)[N], const char* format, ...)
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{
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va_list args;
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va_start(args, format);
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int result = vsnprintf(buffer, N, format, args);
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va_end(args);
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buffer[N - 1] = '\0';
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return result;
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}
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#endif
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#endif /* mozilla_Snprintf_h_ */
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