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/*
* Copyright 2007-2020 CM4all GmbH
* All rights reserved.
*
* author: Max Kellermann <mk@cm4all.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "ISO8601.hxx"
#include "Convert.hxx"
#include "Math.hxx"
#include "util/StringBuffer.hxx"
#include <cassert>
#include <cstdlib>
#include <stdexcept>
StringBuffer<64>
FormatISO8601(const struct tm &tm) noexcept
{
StringBuffer<64> buffer;
strftime(buffer.data(), buffer.capacity(),
#ifdef _WIN32
"%Y-%m-%dT%H:%M:%SZ",
#else
"%FT%TZ",
#endif
&tm);
return buffer;
}
StringBuffer<64>
FormatISO8601(std::chrono::system_clock::time_point tp)
{
return FormatISO8601(GmTime(tp));
}
#ifndef _WIN32
static std::pair<unsigned, unsigned>
ParseTimeZoneOffsetRaw(const char *&s)
{
char *endptr;
unsigned long value = std::strtoul(s, &endptr, 10);
if (endptr == s + 4) {
s = endptr;
return std::make_pair(value / 100, value % 100);
} else if (endptr == s + 2) {
s = endptr;
unsigned hours = value, minutes = 0;
if (*s == ':') {
++s;
minutes = std::strtoul(s, &endptr, 10);
if (endptr != s + 2)
throw std::invalid_argument("Failed to parse time zone offset");
s = endptr;
}
return std::make_pair(hours, minutes);
} else
throw std::invalid_argument("Failed to parse time zone offset");
}
static std::chrono::system_clock::duration
ParseTimeZoneOffset(const char *&s)
{
assert(*s == '+' || *s == '-');
bool negative = *s == '-';
++s;
auto raw = ParseTimeZoneOffsetRaw(s);
if (raw.first > 13)
throw std::invalid_argument("Time offset hours out of range");
if (raw.second >= 60)
throw std::invalid_argument("Time offset minutes out of range");
std::chrono::system_clock::duration d = std::chrono::hours(raw.first);
d += std::chrono::minutes(raw.second);
if (negative)
d = -d;
return d;
}
static const char *
ParseTimeOfDay(const char *s, struct tm &tm,
std::chrono::system_clock::duration &precision) noexcept
{
/* this function always checks "end==s" to work around a
strptime() bug on OS X: if nothing could be parsed,
strptime() returns the input string (indicating success)
instead of nullptr (indicating error) */
const char *end = strptime(s, "%H", &tm);
if (end == nullptr || end == s)
return end;
s = end;
precision = std::chrono::hours(1);
if (*s == ':') {
/* with field separators: now a minute must follow */
++s;
end = strptime(s, "%M", &tm);
if (end == nullptr || end == s)
return nullptr;
s = end;
precision = std::chrono::minutes(1);
/* the "seconds" field is optional */
if (*s != ':')
return s;
++s;
end = strptime(s, "%S", &tm);
if (end == nullptr || end == s)
return nullptr;
precision = std::chrono::seconds(1);
return end;
}
/* without field separators */
end = strptime(s, "%M", &tm);
if (end == nullptr || end == s)
return s;
s = end;
precision = std::chrono::minutes(1);
end = strptime(s, "%S", &tm);
if (end == nullptr || end == s)
return s;
precision = std::chrono::seconds(1);
return end;
}
static bool
StrptimeFull(const char *s, const char *fmt, struct tm *tm) noexcept
{
const char *end = strptime(s, fmt, tm);
return end != nullptr && *end == 0;
}
#endif
std::pair<std::chrono::system_clock::time_point,
std::chrono::system_clock::duration>
ParseISO8601(const char *s)
{
assert(s != nullptr);
#ifdef _WIN32
/* TODO: emulate strptime()? */
(void)s;
throw std::runtime_error("Time parsing not implemented on Windows");
#else
struct tm tm{};
if (StrptimeFull(s, "%Y-%m", &tm)) {
/* full month */
tm.tm_mday = 1;
const auto start = TimeGm(tm);
EndOfMonth(tm);
const auto end = TimeGm(tm);
return {start, end - start};
}
/* parse the date */
const char *end = strptime(s, "%Y-%m-%d", &tm);
if (end == nullptr) {
/* try without field separators */
end = strptime(s, "%Y%m%d", &tm);
if (end == nullptr)
throw std::invalid_argument("Failed to parse date");
}
s = end;
std::chrono::system_clock::duration precision = std::chrono::hours(24);
/* parse the time of day */
if (*s == 'T') {
++s;
s = ParseTimeOfDay(s, tm, precision);
if (s == nullptr)
throw std::invalid_argument("Failed to parse time of day");
}
auto tp = TimeGm(tm);
/* time zone */
if (*s == 'Z')
++s;
else if (*s == '+' || *s == '-')
tp -= ParseTimeZoneOffset(s);
if (*s != 0)
throw std::invalid_argument("Garbage at end of time stamp");
return std::make_pair(tp, precision);
#endif /* !_WIN32 */
}
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