68 lines
2.5 KiB
C++
68 lines
2.5 KiB
C++
/*
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* Copyright 2021 WebAssembly Community Group participants
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef WABT_STRING_FORMAT_H_
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#define WABT_STRING_FORMAT_H_
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#include <cstdarg>
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#include <string>
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#include <vector>
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#include "wabt/config.h"
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#define PRIstringview "%.*s"
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#define WABT_PRINTF_STRING_VIEW_ARG(x) \
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static_cast<int>((x).length()), (x).data()
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#define PRItypecode "%s%#x"
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#define WABT_PRINTF_TYPE_CODE(x) \
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(static_cast<int32_t>(x) < 0 ? "-" : ""), std::abs(static_cast<int32_t>(x))
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#define WABT_DEFAULT_SNPRINTF_ALLOCA_BUFSIZE 128
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#define WABT_SNPRINTF_ALLOCA(buffer, len, format) \
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va_list args; \
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va_list args_copy; \
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va_start(args, format); \
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va_copy(args_copy, args); \
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char fixed_buf[WABT_DEFAULT_SNPRINTF_ALLOCA_BUFSIZE]; \
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char* buffer = fixed_buf; \
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size_t len = wabt_vsnprintf(fixed_buf, sizeof(fixed_buf), format, args); \
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va_end(args); \
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if (len + 1 > sizeof(fixed_buf)) { \
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buffer = static_cast<char*>(alloca(len + 1)); \
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len = wabt_vsnprintf(buffer, len + 1, format, args_copy); \
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} \
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va_end(args_copy)
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namespace wabt {
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inline std::string WABT_PRINTF_FORMAT(1, 2)
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StringPrintf(const char* format, ...) {
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va_list args;
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va_list args_copy;
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va_start(args, format);
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va_copy(args_copy, args);
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size_t len = wabt_vsnprintf(nullptr, 0, format, args) + 1; // For \0.
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std::vector<char> buffer(len);
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va_end(args);
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wabt_vsnprintf(buffer.data(), len, format, args_copy);
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va_end(args_copy);
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return std::string(buffer.data(), len - 1);
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}
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} // namespace wabt
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#endif // WABT_STRING_FORMAT_H_
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