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61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
#ifndef COMPONENTS_MISC_STRINGS_FORMAT_H
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#define COMPONENTS_MISC_STRINGS_FORMAT_H
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#include <cstdio>
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#include <cerrno>
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#include <cstring>
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#include <string>
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#include <string_view>
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#include <stdexcept>
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namespace Misc::StringUtils
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{
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namespace Details
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{
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// Allow to convert complex arguments to C-style strings for format() function
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template <typename T>
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T argument(T value) noexcept
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{
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return value;
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}
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template <typename T>
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T const * argument(std::basic_string_view<T> const & value) noexcept
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{
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return value.data();
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}
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template <typename T>
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T const * argument(std::basic_string<T> const & value) noexcept
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{
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return value.c_str();
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}
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}
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// Requires some C++11 features:
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// 1. std::string needs to be contiguous
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// 2. std::snprintf with zero size (second argument) returns an output string size
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// 3. variadic templates support
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template <typename ... Args>
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std::string format(const char* fmt, Args const & ... args)
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{
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const int size = std::snprintf(nullptr, 0, fmt, Details::argument(args) ...);
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if (size < 0)
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throw std::runtime_error(std::string("Failed to compute resulting string size: ") + std::strerror(errno));
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// Note: sprintf also writes a trailing null character. We should remove it.
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std::string ret(static_cast<std::size_t>(size) + 1, '\0');
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if (std::sprintf(ret.data(), fmt, Details::argument(args) ...) < 0)
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throw std::runtime_error(std::string("Failed to format string: ") + std::strerror(errno));
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ret.erase(static_cast<std::size_t>(size));
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return ret;
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}
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template <typename ... Args>
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std::string format(std::string_view fmt, Args const & ... args)
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{
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return format(fmt.data(), args ...);
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}
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}
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#endif
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