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refactor: use snprintf to show char in hex

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instead of std::ostringstream.
This commit is contained in:
ToruNiina 2019-04-16 20:54:29 +09:00
parent 21fd1271d9
commit b3917aaadf
1 changed files with 9 additions and 4 deletions
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13
toml/combinator.hpp
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@ -9,7 +9,10 @@
#include <type_traits>
#include <iterator>
#include <limits>
#include <array>
#include <iomanip>
#include <cstdio>
#include <cassert>
#include <cctype>
// they scans characters and returns region if it matches to the condition.
@ -38,10 +41,12 @@ inline std::string show_char(const char c)
}
else
{
std::ostringstream oss;
oss << "0x" << std::hex << std::setfill('0') << std::setw(2)
<< static_cast<int>(c);
return oss.str();
std::array<char, 5> buf;
buf.fill('\0');
const auto r = std::snprintf(
buf.data(), buf.size(), "0x%02x", static_cast<int>(c) & 0xFF);
assert(r == buf.size() - 1);
return std::string(buf.data());
}
}