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Diffstat (limited to '')
| -rw-r--r-- | include/o3tl/sprintf.hxx | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/include/o3tl/sprintf.hxx b/include/o3tl/sprintf.hxx new file mode 100644 index 000000000..6491f4ad1 --- /dev/null +++ b/include/o3tl/sprintf.hxx @@ -0,0 +1,41 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */ +/* + * This file is part of the LibreOffice project. + * + * 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/. + */ + +#pragma once + +#include <sal/config.h> + +#include <cassert> +#include <cstddef> +#include <cstdio> +#include <utility> + +#include <o3tl/safeint.hxx> + +namespace o3tl +{ +// A drop-in replacement for safe uses of std::sprintf where it is statically known that the +// provided buffer is large enough. Compared to a plain use of std::sprintf, using o3tl::sprintf +// for one makes it explicit that the call is considerd safe and for another avoids deprecation +// warnings on platforms like the macOS 13 SDK that mark std::sprintf as deprecated. Many simple +// uses of std::sprintf across the code base can be replaced with alternative code using e.g. +// OString::number. This is for the remaining formatting-rich cases for which there is no easy +// replacement yet in our C++17 baseline. Ultimately, it should be removed again once alternatives +// for those remaining cases, like C++20 std::format, are available. +template <std::size_t N, typename... T> +int sprintf(char (&s)[N], char const* format, T&&... arguments) +{ + auto const n = std::snprintf(s, N, format, std::forward<T>(arguments)...); + assert(n < 0 || o3tl::make_unsigned(n) < N); + (void)n; + return n; +} +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */ |