Fix date.c build in msvc.

Ported the win32 implementations of gmtime_r,
localtime_r, and gettimeofday to be part of the 
posix compatibility layer, and fixed
git_signature_now to use them.

src/date.c

@@ -4,11 +4,18 @@
  * Copyright (C) Linus Torvalds, 2005
  */
 
+#include "common.h"
+
+#ifndef GIT_WIN32
+#include <sys/time.h>
+#endif
+
 #include "date.h"
 #include "cache.h"
+#include "posix.h"
 
 #include <ctype.h>
-#include <sys/time.h>
+#include <time.h>
 
 typedef enum {
 	DATE_NORMAL = 0,
@@ -299,7 +306,7 @@ static int match_multi_number(unsigned long num, char c, const char *date, char
  * We just do a binary 'and' to see if the sign bit
  * is set in all the values.
  */
-static inline int nodate(struct tm *tm)
+static int nodate(struct tm *tm)
 {
 	return (tm->tm_year &
 		tm->tm_mon &
@@ -599,9 +606,9 @@ static void date_tea(struct tm *tm, struct tm *now, int *num)
 
 static void date_pm(struct tm *tm, struct tm *now, int *num)
 {
-   GIT_UNUSED(now);
 	int hour, n = *num;
 	*num = 0;
+   GIT_UNUSED(now);
 
 	hour = tm->tm_hour;
 	if (n) {
@@ -614,9 +621,9 @@ static void date_pm(struct tm *tm, struct tm *now, int *num)
 
 static void date_am(struct tm *tm, struct tm *now, int *num)
 {
-   GIT_UNUSED(now);
 	int hour, n = *num;
 	*num = 0;
+   GIT_UNUSED(now);
 
 	hour = tm->tm_hour;
 	if (n) {
@@ -629,9 +636,9 @@ static void date_am(struct tm *tm, struct tm *now, int *num)
 
 static void date_never(struct tm *tm, struct tm *now, int *num)
 {
+	time_t n = 0;
    GIT_UNUSED(now);
    GIT_UNUSED(num);
-	time_t n = 0;
 	localtime_r(&n, tm);
 }
 
@@ -821,7 +828,7 @@ static unsigned long approxidate_str(const char *date,
 {
 	int number = 0;
 	int touched = 0;
-	struct tm tm, now;
+	struct tm tm = {0}, now;
 	time_t time_sec;
 
 	time_sec = tv->tv_sec;

src/revparse.c

@@ -199,10 +199,12 @@ static int walk_ref_history(git_object **out, git_repository *repo, const char *
          git_reference_free(ref);
       }
    } else {
+      int date_error = 0;
+      time_t timestamp;
       git_buf datebuf = GIT_BUF_INIT;
+
       git_buf_put(&datebuf, reflogspec+2, reflogspeclen-3);
-      int date_error = 0;
-      time_t timestamp = approxidate_careful(git_buf_cstr(&datebuf), &date_error);
+	  timestamp = approxidate_careful(git_buf_cstr(&datebuf), &date_error);
 
       /* @{u} or @{upstream} -> upstream branch, for a tracking branch. This is stored in the config. */
       if (!strcmp(reflogspec, "@{u}") || !strcmp(reflogspec, "@{upstream}")) {
@@ -267,8 +269,10 @@ static int walk_ref_history(git_object **out, git_repository *repo, const char *
 
                /* TODO: clunky. Factor "now" into a utility */
                git_signature *sig;
+               git_time as_of;
+
                git_signature_now(&sig, "blah", "blah");
-               git_time as_of = sig->when;
+               as_of = sig->when;
                git_signature_free(sig);
 
                as_of.time = (timestamp > 0)

src/signature.c

@@ -113,26 +113,14 @@ int git_signature_now(git_signature **sig_out, const char *name, const char *ema
 	time_t offset;
 	struct tm *utc_tm, *local_tm;
 	git_signature *sig;
-
-#ifndef GIT_WIN32
 	struct tm _utc, _local;
-#endif
 
 	*sig_out = NULL;
 
 	time(&now);
 
-	/**
-	 * On Win32, `gmtime_r` doesn't exist but
-	 * `gmtime` is threadsafe, so we can use that
-	 */
-#ifdef GIT_WIN32
-	utc_tm = gmtime(&now);
-	local_tm = localtime(&now);
-#else
 	utc_tm = gmtime_r(&now, &_utc);
 	local_tm = localtime_r(&now, &_local);
-#endif
 
 	offset = mktime(local_tm) - mktime(utc_tm);
 	offset /= 60;

src/util.h

@@ -213,7 +213,7 @@ GIT_INLINE(int) git__time_cmp(const git_time *a, const git_time *b)
 {
    /* Adjust for time zones. Times are in seconds, offsets are in minutes. */
    git_time_t adjusted_a = a->time + ((b->offset - a->offset) * 60);
-   return adjusted_a - b->time;
+   return (int)(adjusted_a - b->time);
 }
 
 #endif /* INCLUDE_util_h__ */

src/win32/posix.h

@@ -52,4 +52,8 @@ extern int p_rename(const char *from, const char *to);
 extern int p_recv(GIT_SOCKET socket, void *buffer, size_t length, int flags);
 extern int p_send(GIT_SOCKET socket, const void *buffer, size_t length, int flags);
 
+extern struct tm * localtime_r (const time_t *timer, struct tm *result);
+extern struct tm * gmtime_r (const time_t *timer, struct tm *result);
+extern int gettimeofday(struct timeval *tv, struct timezone *tz);
+
 #endif

src/win32/posix_w32.c

@@ -470,3 +470,79 @@ int p_send(GIT_SOCKET socket, const void *buffer, size_t length, int flags)
 
 	return send(socket, buffer, (int)length, flags);
 }
+
+/**
+ * Borrowed from http://old.nabble.com/Porting-localtime_r-and-gmtime_r-td15282276.html
+ * On Win32, `gmtime_r` doesn't exist but `gmtime` is threadsafe, so we can use that
+ */
+struct tm * 
+localtime_r (const time_t *timer, struct tm *result) 
+{ 
+   struct tm *local_result; 
+   local_result = localtime (timer); 
+
+   if (local_result == NULL || result == NULL) 
+      return NULL; 
+
+   memcpy (result, local_result, sizeof (struct tm)); 
+   return result; 
+} 
+struct tm * 
+gmtime_r (const time_t *timer, struct tm *result) 
+{ 
+   struct tm *local_result; 
+   local_result = gmtime (timer); 
+
+   if (local_result == NULL || result == NULL) 
+      return NULL; 
+
+   memcpy (result, local_result, sizeof (struct tm)); 
+   return result; 
+}
+
+#if defined(_MSC_VER) || defined(_MSC_EXTENSIONS)
+#define DELTA_EPOCH_IN_MICROSECS  11644473600000000Ui64
+#else
+#define DELTA_EPOCH_IN_MICROSECS  11644473600000000ULL
+#endif
+ 
+struct timezone 
+{
+   int  tz_minuteswest; /* minutes W of Greenwich */
+   int  tz_dsttime;     /* type of dst correction */
+};
+ 
+int gettimeofday(struct timeval *tv, struct timezone *tz)
+{
+   FILETIME ft;
+   unsigned __int64 tmpres = 0;
+   static int tzflag;
+ 
+   if (NULL != tv)
+      {
+         GetSystemTimeAsFileTime(&ft);
+ 
+         tmpres |= ft.dwHighDateTime;
+         tmpres <<= 32;
+         tmpres |= ft.dwLowDateTime;
+ 
+         /*converting file time to unix epoch*/
+         tmpres /= 10;  /*convert into microseconds*/
+         tmpres -= DELTA_EPOCH_IN_MICROSECS; 
+         tv->tv_sec = (long)(tmpres / 1000000UL);
+         tv->tv_usec = (long)(tmpres % 1000000UL);
+      }
+ 
+   if (NULL != tz)
+      {
+         if (!tzflag)
+            {
+               _tzset();
+               tzflag++;
+            }
+         tz->tz_minuteswest = _timezone / 60;
+         tz->tz_dsttime = _daylight;
+      }
+ 
+   return 0;
+}