54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
/*
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Formatting library for C++ - time formatting
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Copyright (c) 2012 - 2016, Victor Zverovich
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All rights reserved.
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For the license information refer to format.h.
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*/
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#ifndef FMT_TIME_H_
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#define FMT_TIME_H_
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#include "fmt/format.h"
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#include <ctime>
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namespace fmt {
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template <typename ArgFormatter>
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void format_arg(BasicFormatter<char, ArgFormatter> &f,
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const char *&format_str, const std::tm &tm) {
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if (*format_str == ':')
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++format_str;
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const char *end = format_str;
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while (*end && *end != '}')
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++end;
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if (*end != '}')
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FMT_THROW(format_error("missing '}' in format string"));
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internal::MemoryBuffer<char, internal::INLINE_BUFFER_SIZE> format;
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format.append(format_str, end + 1);
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format[format.size() - 1] = '\0';
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Buffer<char> &buffer = f.writer().buffer();
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std::size_t start = buffer.size();
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for (;;) {
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std::size_t size = buffer.capacity() - start;
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std::size_t count = std::strftime(&buffer[start], size, &format[0], &tm);
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if (count != 0) {
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buffer.resize(start + count);
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break;
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}
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if (size >= format.size() * 256) {
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// If the buffer is 256 times larger than the format string, assume
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// that `strftime` gives an empty result. There doesn't seem to be a
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// better way to distinguish the two cases:
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// https://github.com/fmtlib/fmt/issues/367
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break;
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}
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const std::size_t MIN_GROWTH = 10;
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buffer.reserve(buffer.capacity() + (size > MIN_GROWTH ? size : MIN_GROWTH));
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}
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format_str = end + 1;
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}
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}
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#endif // FMT_TIME_H_
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