src: Always use our own faster simpler timegm, use it to calculate gmtoff

src/shrpx-unittest.cc

@@ -152,6 +152,10 @@ int main(int argc, char *argv[]) {
                    shrpx::test_util_format_duration) ||
       !CU_add_test(pSuite, "util_starts_with", shrpx::test_util_starts_with) ||
       !CU_add_test(pSuite, "util_ends_with", shrpx::test_util_ends_with) ||
+      !CU_add_test(pSuite, "util_parse_http_date",
+                   shrpx::test_util_parse_http_date) ||
+      !CU_add_test(pSuite, "util_localtime_date",
+                   shrpx::test_util_localtime_date) ||
       !CU_add_test(pSuite, "gzip_inflate", test_nghttp2_gzip_inflate) ||
       !CU_add_test(pSuite, "buffer_write", nghttp2::test_buffer_write) ||
       !CU_add_test(pSuite, "pool_recycle", nghttp2::test_pool_recycle) ||

src/timegm.c

@@ -24,8 +24,6 @@
  */
 #include "timegm.h"
 
-#ifndef HAVE_TIMEGM
-
 #include <inttypes.h>
 
 /* Counter the number of leap year in the range [0, y). The |y| is the
@@ -35,15 +33,6 @@ static int count_leap_year(int y) {
   return y / 4 - y / 100 + y / 400;
 }
 
-/* Returns nonzero if the |y| is the leap year. The |y| is the year,
-   including century (e.g., 2012) */
-static int is_leap_year(int y) {
-  return y % 4 == 0 && (y % 100 != 0 || y % 400 == 0);
-}
-
-/* The number of days before ith month begins */
-static int daysum[] = {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
-
 /* Based on the algorithm of Python 2.7 calendar.timegm. */
 time_t timegm(struct tm *tm) {
   int days;
@@ -53,11 +42,7 @@ time_t timegm(struct tm *tm) {
     return -1;
   }
   num_leap_year = count_leap_year(tm->tm_year + 1900) - count_leap_year(1970);
-  days = (tm->tm_year - 70) * 365 + num_leap_year + daysum[tm->tm_mon] +
-         tm->tm_mday - 1;
-  if (tm->tm_mon >= 2 && is_leap_year(tm->tm_year + 1900)) {
-    ++days;
-  }
+  days = (tm->tm_year - 70) * 365 + num_leap_year + tm->tm_yday;
   t = ((int64_t)days * 24 + tm->tm_hour) * 3600 + tm->tm_min * 60 + tm->tm_sec;
   if (sizeof(time_t) == 4) {
     if (t < INT32_MIN || t > INT32_MAX) {
@@ -66,5 +51,3 @@ time_t timegm(struct tm *tm) {
   }
   return (time_t)t;
 }
-
-#endif /* !HAVE_TIMEGM */

src/timegm.h

@@ -37,12 +37,8 @@ extern "C" {
 #include <time.h>
 #endif // HAVE_TIME_H
 
-#ifndef HAVE_TIMEGM
-
 time_t timegm(struct tm *tm);
 
-#endif /* HAVE_TIMEGM */
-
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */

src/util.cc

@@ -254,7 +254,6 @@ std::string common_log_date(time_t t) {
     return "";
   }
 
-#ifdef HAVE_STRUCT_TM_TM_GMTOFF
   // Format data like this:
   // 03/Jul/2014:00:19:38 +0900
   std::string res;
@@ -276,7 +275,11 @@ std::string common_log_date(time_t t) {
   p = cpydig(p, tms.tm_sec, 2);
   *p++ = ' ';
 
+#ifdef HAVE_STRUCT_TM_TM_GMTOFF
   auto gmtoff = tms.tm_gmtoff;
+#else  // !HAVE_STRUCT_TM_TM_GMTOFF
+  auto gmtoff = timegm(&tms) - t;
+#endif // !HAVE_STRUCT_TM_TM_GMTOFF
   if (gmtoff >= 0) {
     *p++ = '+';
   } else {
@@ -288,13 +291,6 @@ std::string common_log_date(time_t t) {
   p = cpydig(p, (gmtoff % 3600) / 60, 2);
 
   return res;
-#else  // !HAVE_STRUCT_TM_TM_GMTOFF
-  char buf[32];
-
-  strftime(buf, sizeof(buf), "%d/%b/%Y:%T %z", &tms);
-
-  return buf;
-#endif // !HAVE_STRUCT_TM_TM_GMTOFF
 }
 
 std::string iso8601_date(int64_t ms) {
@@ -305,7 +301,6 @@ std::string iso8601_date(int64_t ms) {
     return "";
   }
 
-#ifdef HAVE_STRUCT_TM_TM_GMTOFF
   // Format data like this:
   // 2014-11-15T12:58:24.741Z
   // 2014-11-15T12:58:24.741+09:00
@@ -328,7 +323,11 @@ std::string iso8601_date(int64_t ms) {
   *p++ = '.';
   p = cpydig(p, ms % 1000, 3);
 
+#ifdef HAVE_STRUCT_TM_TM_GMTOFF
   auto gmtoff = tms.tm_gmtoff;
+#else  // !HAVE_STRUCT_TM_TM_GMTOFF
+  auto gmtoff = timegm(&tms) - sec;
+#endif // !HAVE_STRUCT_TM_TM_GMTOFF
   if (gmtoff == 0) {
     *p++ = 'Z';
   } else {
@@ -346,29 +345,6 @@ std::string iso8601_date(int64_t ms) {
   res.resize(p - std::begin(res));
 
   return res;
-#else  // !HAVE_STRUCT_TM_TM_GMTOFF
-  char buf[128];
-
-  auto nwrite = strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &tms);
-  nwrite += snprintf(&buf[nwrite], sizeof(buf) - nwrite, ".%03d",
-                     static_cast<int>(ms % 1000));
-  auto nzone = strftime(&buf[nwrite], sizeof(buf) - nwrite, "%z", &tms);
-
-  // %z of strftime writes +hhmm or -hhmm not Z, +hh:mm or -hh:mm.  Do
-  // %nothing if nzone is not 5.  we don't know how to cope with this.
-  if (nzone == 5) {
-    if (memcmp(&buf[nwrite], "+0000", 5) == 0) {
-      // 0000 should be Z
-      memcpy(&buf[nwrite], "Z", 2);
-    } else {
-      // Move mm part to right by 1 including terminal \0
-      memmove(&buf[nwrite + 4], &buf[nwrite + 3], 3);
-      // Insert ':' between hh and mm
-      buf[nwrite + 3] = ':';
-    }
-  }
-  return buf;
-#endif // !HAVE_STRUCT_TM_TM_GMTOFF
 }
 
 time_t parse_http_date(const std::string &s) {

src/util_test.cc

@@ -367,4 +367,30 @@ void test_util_ends_with(void) {
   CU_ASSERT(!util::iendsWith("ofoo", "fo"));
 }
 
+void test_util_parse_http_date(void) {
+  CU_ASSERT(1001939696 ==
+            util::parse_http_date("Mon, 1 Oct 2001 12:34:56 GMT"));
+}
+
+void test_util_localtime_date(void) {
+  auto tz = getenv("TZ");
+  if (tz) {
+    tz = strdup(tz);
+  }
+  setenv("TZ", ":Pacific/Auckland", 1);
+  tzset();
+
+  CU_ASSERT_STRING_EQUAL("02/Oct/2001:00:34:56 +1200",
+                         util::common_log_date(1001939696).c_str());
+  CU_ASSERT_STRING_EQUAL("2001-10-02T00:34:56.123+12:00",
+                         util::iso8601_date(1001939696000LL + 123).c_str());
+
+  if (tz) {
+    setenv("TZ", tz, 1);
+  } else {
+    unsetenv("TZ");
+  }
+  tzset();
+}
+
 } // namespace shrpx

src/util_test.h

@@ -53,6 +53,8 @@ void test_util_duration_str(void);
 void test_util_format_duration(void);
 void test_util_starts_with(void);
 void test_util_ends_with(void);
+void test_util_parse_http_date(void);
+void test_util_localtime_date(void);
 
 } // namespace shrpx