Evil: add gettimeofday()

Add gettimeofday implementation based on the mingw one, using a more acurate function if Windows >= 8

Reviewed-by: João Paulo Taylor Ienczak Zanette <joao.tiz@expertisesolutions.com.br>
Reviewed-by: Stefan Schmidt <stefan@datenfreihafen.org>
Differential Revision: https://phab.enlightenment.org/D12111

src/lib/evil/evil_dlfcn.h

@@ -194,7 +194,7 @@ EAPI int dlclose(void* handle);
  */
 EAPI void *dlsym(void* handle, const char* symbol);
 #ifndef HAVE_DLSYM
-#define HAVE_DLSYM 1
+# define HAVE_DLSYM 1
 #endif
 #ifdef _GNU_SOURCE
 
@@ -223,7 +223,7 @@ EAPI void *dlsym(void* handle, const char* symbol);
  */
 EAPI int dladdr (const void *addr, Dl_info *info);
 #ifndef HAVE_DLADDR
-#define HAVE_DLADDR 1
+# define HAVE_DLADDR 1
 #endif
 #endif /* _GNU_SOURCE */
 

src/lib/evil/evil_macro_wrapper.h

@@ -45,6 +45,22 @@
 #endif
 #define mkdir(dirname, mode) evil_mkdir(dirname, mode)
 
+/*
+ * evil_time.h
+ */
+
+/**
+ * @def gettimeofday(tv, tz)
+ *
+ * Wrapper around evil_gettimeofday().
+ *
+ * @since 1.25
+ */
+#ifndef _GETTIMEOFDAY_DEFINED
+# define _GETTIMEOFDAY_DEFINED
+# define gettimeofday(tv, tz) evil_gettimeofday(tv, tz)
+#endif
+
 /*
  * evil_unistd.h
  */

src/lib/evil/evil_time.c

@@ -9,6 +9,58 @@
 
 #include "evil_private.h"
 
+/*
+ * gettimeofday
+ * based on https://github.com/Alexpux/mingw-w64/blob/master/mingw-w64-crt/misc/gettimeofday.c
+ * public domain
+ */
+
+#define FILETIME_1970 116444736000000000ull /* seconds between 1/1/1601 and 1/1/1970 */
+
+int evil_gettimeofday(struct timeval *tv, struct timezone *tz)
+{
+   int res = 0;
+   union
+   {
+      unsigned long long ns100; /* time since 1 Jan 1601 in 100ns units */
+      FILETIME ft;
+   } _now;
+   TIME_ZONE_INFORMATION time_zone_information;
+   DWORD tzi;
+
+   if (tz != NULL)
+     {
+        tzi = GetTimeZoneInformation(&time_zone_information);
+        if (tzi != TIME_ZONE_ID_INVALID)
+          {
+             tz->tz_minuteswest = time_zone_information.Bias;
+             if (tzi == TIME_ZONE_ID_DAYLIGHT)
+               tz->tz_dsttime = 1;
+             else
+               tz->tz_dsttime = 0;
+          }
+        else
+          {
+             tz->tz_minuteswest = 0;
+             tz->tz_dsttime = 0;
+          }
+     }
+
+   if (tv != NULL)
+     {
+#if _WIN32_WINNT < 0x0602
+        GetSystemTimeAsFileTime(&_now.ft);
+#else
+        GetSystemTimePreciseAsFileTime(&_now.ft);
+#endif
+        _now.ns100 -= FILETIME_1970;	/* 100 nano-seconds since 1-1-1970 */
+        tv->tv_sec = _now.ns100 / 10000000ull;	/* seconds since 1-1-1970 */
+        tv->tv_usec = (long) (_now.ns100 % 10000000ull) /10; /* nanoseconds */
+     }
+
+   return res;
+}
+
 /*
  * strptime
  * based on http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/time/strptime.c?rev=HEAD

src/lib/evil/evil_time.h

@@ -16,6 +16,33 @@
  * @{
  */
 
+#ifdef _MSC_VER
+struct timezone
+{
+  int tz_minuteswest; /* of Greenwich */
+  int tz_dsttime;     /* type of dst correction to apply */
+};
+#endif
+
+/**
+ * @brief Get time and timezone.
+ *
+ * @param tv A pointer that contains two sockets.
+ * @param tz A pointer that contains two sockets.
+ * @return 0 on success, -1 otherwise.
+ *
+ * This function gets the time and timezone. @p tv and @p tz can be
+ * @c NULL. It calls GetSystemTimePreciseAsFileTime() on Windows 8or
+ * above if _WIN32_WINNT is correctly defined. It returns 0 on
+ * success, -1 otherwise.
+ *
+ * @since 1.25
+ */
+EAPI int evil_gettimeofday(struct timeval *tv, struct timezone *tz);
+#ifndef HAVE_GETTIMEOFDAY
+# define HAVE_GETTIMEOFDAY 1
+#endif
+
 
 /**
  * @brief Convert a string representation of time to a time tm structure .