From 0aaba7a461341916f61929e0a8ea871055d8dd73 Mon Sep 17 00:00:00 2001
From: Dmitry Frank <mail@dmitryfrank.com>
Date: Tue, 12 Sep 2017 19:08:43 +0300
Subject: [PATCH] Add cs_timegm
Which is a slightly modified version from
https://stackoverflow.com/questions/283166/easy-way-to-convert-a-struct-tm-expressed-in-utc-to-time-t-type
PUBLISHED_FROM=b73f920ca42c45473c23337782e815306bdf69f1
---
mongoose.c | 35 +++++++++++++++++++++++++++++++++++
mongoose.h | 8 ++++++++
2 files changed, 43 insertions(+)
diff --git a/mongoose.c b/mongoose.c
index d75993976..b3461bf72 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -780,6 +780,41 @@ double cs_time(void) {
#endif /* _WIN32 */
return now;
}
+
+double cs_timegm(const struct tm *tm) {
+ /* Month-to-day offset for non-leap-years. */
+ static const int month_day[12] = {0, 31, 59, 90, 120, 151,
+ 181, 212, 243, 273, 304, 334};
+
+ /* Most of the calculation is easy; leap years are the main difficulty. */
+ int month = tm->tm_mon % 12;
+ int year = tm->tm_year + tm->tm_mon / 12;
+ int year_for_leap;
+ int64_t rt;
+
+ if (month < 0) { /* Negative values % 12 are still negative. */
+ month += 12;
+ --year;
+ }
+
+ /* This is the number of Februaries since 1900. */
+ year_for_leap = (month > 1) ? year + 1 : year;
+
+ rt =
+ tm->tm_sec /* Seconds */
+ +
+ 60 *
+ (tm->tm_min /* Minute = 60 seconds */
+ +
+ 60 * (tm->tm_hour /* Hour = 60 minutes */
+ +
+ 24 * (month_day[month] + tm->tm_mday - 1 /* Day = 24 hours */
+ + 365 * (year - 70) /* Year = 365 days */
+ + (year_for_leap - 69) / 4 /* Every 4 years is leap... */
+ - (year_for_leap - 1) / 100 /* Except centuries... */
+ + (year_for_leap + 299) / 400))); /* Except 400s. */
+ return rt < 0 ? -1 : (double) rt;
+}
#ifdef MG_MODULE_LINES
#line 1 "common/cs_endian.h"
#endif
diff --git a/mongoose.h b/mongoose.h
index 78482c2e7..2822d9bc2 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -1797,6 +1797,8 @@ void cs_hmac_sha1(const unsigned char *key, size_t key_len,
#ifndef CS_COMMON_CS_TIME_H_
#define CS_COMMON_CS_TIME_H_
+#include <time.h>
+
/* Amalgamated: #include "common/platform.h" */
#ifdef __cplusplus
@@ -1806,6 +1808,12 @@ extern "C" {
/* Sub-second granularity time(). */
double cs_time(void);
+/*
+ * Similar to (non-standard) timegm, converts broken-down time into the number
+ * of seconds since Unix Epoch.
+ */
+double cs_timegm(const struct tm *tm);
+
#ifdef __cplusplus
}
#endif /* __cplusplus */
--
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