53 lines
2.3 KiB
C++
53 lines
2.3 KiB
C++
#pragma once
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// Author: Torarin Hals Bakke (2013)
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// Boost Software License - Version 1.0 - August 17th, 2003
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#include <cassert>
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#include <cstdio>
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#include <string>
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template <size_t N, typename... Ts>
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std::string strprintf_impl(const char (&format)[N], Ts... ts) {
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const auto length_guess = static_cast<size_t>(1.5 * (N - 1 /* '\0' */) + 0.5);
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std::string result;
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result.resize(length_guess);
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auto formatted_length =
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snprintf(&result[0], length_guess + 1 /* '\0' */, &format[0], ts...);
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assert(formatted_length >= 0);
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result.resize(formatted_length);
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if ((unsigned) formatted_length > length_guess) {
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auto snprintf_ret =
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snprintf(&result[0], formatted_length + 1 /* '\0' */, &format[0], ts...);
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assert(snprintf_ret >= 0);
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}
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return result;
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}
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int strprintf_arg_checker(const char* format, ...) __attribute__((format(printf, 1, 2)));
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#define strprintf(format, ts...) \
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((void) sizeof(strprintf_arg_checker(format, ts)), strprintf_impl(format, ts))
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