Alexander Shabalin
33 lines
1.2 KiB
C++
33 lines
1.2 KiB
C++
/*
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* Copyright 2010-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
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* that can be found in the LICENSE file.
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*/
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#include "Format.h"
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#include "Porting.h"
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using namespace kotlin;
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std_support::span<char> kotlin::FormatToSpan(std_support::span<char> buffer, const char* format, ...) noexcept {
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std::va_list args;
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va_start(args, format);
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auto result = VFormatToSpan(buffer, format, args);
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va_end(args);
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return result;
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}
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std_support::span<char> kotlin::VFormatToSpan(std_support::span<char> buffer, const char* format, std::va_list args) noexcept {
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if (buffer.empty()) return buffer;
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if (buffer.size() == 1) {
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buffer.front() = '\0';
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return buffer;
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}
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int written = konan::vsnprintf(buffer.data(), buffer.size(), format, args);
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// Consider this a failure, nothing has been written. TODO: Should this be an exception/RuntimeAssert?
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if (written < 0) return buffer;
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// If `written` is larger than the buffer size, just pretend we filled the entire buffer (ignoring the trailing \0).
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size_t writtenSize = std::min(static_cast<size_t>(written), buffer.size() - 1);
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return buffer.subspan(writtenSize);
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}
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