61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
/*
|
|
Formatting library for C++ - time formatting
|
|
|
|
Copyright (c) 2012 - 2016, Victor Zverovich
|
|
All rights reserved.
|
|
|
|
For the license information refer to format.h.
|
|
*/
|
|
|
|
#ifndef FMT_TIME_H_
|
|
#define FMT_TIME_H_
|
|
|
|
#include "fmt/format.h"
|
|
#include <ctime>
|
|
|
|
namespace fmt {
|
|
|
|
template <>
|
|
struct formatter<std::tm> {
|
|
template <typename ParseContext>
|
|
auto parse(ParseContext &ctx) -> decltype(ctx.begin()) {
|
|
auto it = internal::null_terminating_iterator<char>(ctx);
|
|
if (*it == ':')
|
|
++it;
|
|
auto end = it;
|
|
while (*end && *end != '}')
|
|
++end;
|
|
tm_format.reserve(end - it + 1);
|
|
using internal::pointer_from;
|
|
tm_format.append(pointer_from(it), pointer_from(end));
|
|
tm_format.push_back('\0');
|
|
return pointer_from(end);
|
|
}
|
|
|
|
void format(buffer &buf, const std::tm &tm, context &) {
|
|
std::size_t start = buf.size();
|
|
for (;;) {
|
|
std::size_t size = buf.capacity() - start;
|
|
std::size_t count = std::strftime(&buf[start], size, &tm_format[0], &tm);
|
|
if (count != 0) {
|
|
buf.resize(start + count);
|
|
break;
|
|
}
|
|
if (size >= tm_format.size() * 256) {
|
|
// If the buffer is 256 times larger than the format string, assume
|
|
// that `strftime` gives an empty result. There doesn't seem to be a
|
|
// better way to distinguish the two cases:
|
|
// https://github.com/fmtlib/fmt/issues/367
|
|
break;
|
|
}
|
|
const std::size_t MIN_GROWTH = 10;
|
|
buf.reserve(buf.capacity() + (size > MIN_GROWTH ? size : MIN_GROWTH));
|
|
}
|
|
}
|
|
|
|
memory_buffer tm_format;
|
|
};
|
|
}
|
|
|
|
#endif // FMT_TIME_H_
|