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time/ISO8601: support time zone offset

This commit is contained in:
Max Kellermann 2019-08-19 22:38:06 +02:00
parent b06825829b
commit 7d8b1860c3
2 changed files with 59 additions and 0 deletions
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53
src/time/ISO8601.cxx
View File

@ -58,6 +58,56 @@ FormatISO8601(std::chrono::system_clock::time_point tp)
return FormatISO8601(GmTime(tp));
}
static std::pair<unsigned, unsigned>
ParseTimeZoneOffsetRaw(const char *&s)
{
char *endptr;
unsigned long value = 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 = strtoul(s, &endptr, 10);
if (endptr != s + 2)
throw std::runtime_error("Failed to parse time zone offset");
s = endptr;
}
return std::make_pair(hours, minutes);
} else
throw std::runtime_error("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::runtime_error("Time offset hours out of range");
if (raw.second >= 60)
throw std::runtime_error("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;
}
std::pair<std::chrono::system_clock::time_point,
std::chrono::system_clock::duration>
ParseISO8601(const char *s)
@ -93,8 +143,11 @@ ParseISO8601(const char *s)
auto tp = TimeGm(tm);
/* time zone */
if (*s == 'Z')
++s;
else if (*s == '+' || *s == '-')
tp -= ParseTimeZoneOffset(s);
if (*s != 0)
throw std::runtime_error("Garbage at end of time stamp");

6
test/TestISO8601.cxx
View File

@ -57,6 +57,12 @@ static constexpr struct {
/* without time zone */
{ "2019-02-04T16:46:41", 1549298801, std::chrono::seconds(1) },
/* with time zone */
{ "2019-02-04T16:46:41+02", 1549291601, std::chrono::seconds(1) },
{ "2019-02-04T16:46:41+0200", 1549291601, std::chrono::seconds(1) },
{ "2019-02-04T16:46:41+02:00", 1549291601, std::chrono::seconds(1) },
{ "2019-02-04T16:46:41-0200", 1549306001, std::chrono::seconds(1) },
};
TEST(ISO8601, Parse)