Import LibreSSL 3.2.0

1 files changed, 220 insertions, 0 deletions

diff --git a/compat/timegm.c b/compat/timegm.c
new file mode 100644
index 0000000..2658445
--- /dev/null
+++ b/compat/timegm.c
@@ -0,0 +1,220 @@
+/*
+ * ----------------------------------------------------------------------
+ * Copyright © 2005-2014 Rich Felker, et al.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * ----------------------------------------------------------------------
+ */
+
+#include <errno.h>
+#include <limits.h>
+#include <time.h>
+
+/* 2000-03-01 (mod 400 year, immediately after feb29 */
+#define LEAPOCH (946684800LL + 86400*(31+29))
+
+#define DAYS_PER_400Y (365*400 + 97)
+#define DAYS_PER_100Y (365*100 + 24)
+#define DAYS_PER_4Y   (365*4   + 1)
+
+static int __month_to_secs(int month, int is_leap)
+{
+	static const int secs_through_month[] = {
+		0, 31*86400, 59*86400, 90*86400,
+		120*86400, 151*86400, 181*86400, 212*86400,
+		243*86400, 273*86400, 304*86400, 334*86400 };
+	int t = secs_through_month[month];
+	if (is_leap && month >= 2) t+=86400;
+	return t;
+}
+
+static long long __year_to_secs(long long year, int *is_leap)
+{
+	if (year-2ULL <= 136) {
+		int y = year;
+		int leaps = (y-68)>>2;
+		if (!((y-68)&3)) {
+			leaps--;
+			if (is_leap) *is_leap = 1;
+		} else if (is_leap) *is_leap = 0;
+		return 31536000*(y-70) + 86400*leaps;
+	}
+
+	int cycles, centuries, leaps, rem;
+
+	if (!is_leap) is_leap = &(int){0};
+	cycles = (year-100) / 400;
+	rem = (year-100) % 400;
+	if (rem < 0) {
+		cycles--;
+		rem += 400;
+	}
+	if (!rem) {
+		*is_leap = 1;
+		centuries = 0;
+		leaps = 0;
+	} else {
+		if (rem >= 200) {
+			if (rem >= 300) centuries = 3, rem -= 300;
+			else centuries = 2, rem -= 200;
+		} else {
+			if (rem >= 100) centuries = 1, rem -= 100;
+			else centuries = 0;
+		}
+		if (!rem) {
+			*is_leap = 0;
+			leaps = 0;
+		} else {
+			leaps = rem / 4U;
+			rem %= 4U;
+			*is_leap = !rem;
+		}
+	}
+
+	leaps += 97*cycles + 24*centuries - *is_leap;
+
+	return (year-100) * 31536000LL + leaps * 86400LL + 946684800 + 86400;
+}
+
+static long long __tm_to_secs(const struct tm *tm)
+{
+	int is_leap;
+	long long year = tm->tm_year;
+	int month = tm->tm_mon;
+	if (month >= 12 || month < 0) {
+		int adj = month / 12;
+		month %= 12;
+		if (month < 0) {
+			adj--;
+			month += 12;
+		}
+		year += adj;
+	}
+	long long t = __year_to_secs(year, &is_leap);
+	t += __month_to_secs(month, is_leap);
+	t += 86400LL * (tm->tm_mday-1);
+	t += 3600LL * tm->tm_hour;
+	t += 60LL * tm->tm_min;
+	t += tm->tm_sec;
+	return t;
+}
+
+static int __secs_to_tm(long long t, struct tm *tm)
+{
+	long long days, secs;
+	int remdays, remsecs, remyears;
+	int qc_cycles, c_cycles, q_cycles;
+	int years, months;
+	int wday, yday, leap;
+	static const char days_in_month[] = {31,30,31,30,31,31,30,31,30,31,31,29};
+
+	/* Reject time_t values whose year would overflow int */
+	if (t < INT_MIN * 31622400LL || t > INT_MAX * 31622400LL)
+		return -1;
+
+	secs = t - LEAPOCH;
+	days = secs / 86400;
+	remsecs = secs % 86400;
+	if (remsecs < 0) {
+		remsecs += 86400;
+		days--;
+	}
+
+	wday = (3+days)%7;
+	if (wday < 0) wday += 7;
+
+	qc_cycles = days / DAYS_PER_400Y;
+	remdays = days % DAYS_PER_400Y;
+	if (remdays < 0) {
+		remdays += DAYS_PER_400Y;
+		qc_cycles--;
+	}
+
+	c_cycles = remdays / DAYS_PER_100Y;
+	if (c_cycles == 4) c_cycles--;
+	remdays -= c_cycles * DAYS_PER_100Y;
+
+	q_cycles = remdays / DAYS_PER_4Y;
+	if (q_cycles == 25) q_cycles--;
+	remdays -= q_cycles * DAYS_PER_4Y;
+
+	remyears = remdays / 365;
+	if (remyears == 4) remyears--;
+	remdays -= remyears * 365;
+
+	leap = !remyears && (q_cycles || !c_cycles);
+	yday = remdays + 31 + 28 + leap;
+	if (yday >= 365+leap) yday -= 365+leap;
+
+	years = remyears + 4*q_cycles + 100*c_cycles + 400*qc_cycles;
+
+	for (months=0; days_in_month[months] <= remdays; months++)
+		remdays -= days_in_month[months];
+
+	if (years+100 > INT_MAX || years+100 < INT_MIN)
+		return -1;
+
+	tm->tm_year = years + 100;
+	tm->tm_mon = months + 2;
+	if (tm->tm_mon >= 12) {
+		tm->tm_mon -=12;
+		tm->tm_year++;
+	}
+	tm->tm_mday = remdays + 1;
+	tm->tm_wday = wday;
+	tm->tm_yday = yday;
+
+	tm->tm_hour = remsecs / 3600;
+	tm->tm_min = remsecs / 60 % 60;
+	tm->tm_sec = remsecs % 60;
+
+	return 0;
+}
+
+#ifdef _WIN32
+struct tm *__gmtime_r(const time_t *t, struct tm *tm)
+{
+	if (__secs_to_tm(*t, tm) < 0) {
+		errno = EOVERFLOW;
+		return 0;
+	}
+	tm->tm_isdst = 0;
+	return tm;
+}
+#endif
+
+time_t timegm(struct tm *tm)
+{
+	struct tm new;
+	long long t = __tm_to_secs(tm);
+	if (__secs_to_tm(t, &new) < 0) {
+		errno = EOVERFLOW;
+		return -1;
+	}
+#if SIZEOF_TIME_T != 8
+	if (t > (long long)INT_MAX || t < (long long)INT_MIN) {
+		errno = EOVERFLOW;
+		return -1;
+	}
+#endif
+	*tm = new;
+	tm->tm_isdst = 0;
+	return t;
+}