compat: Provide a gettimeofday replacement

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

compat/gettimeofday.c

+/*****************************************************************************
+ * gettimeofday.c: gettimeofday() replacement
+ *****************************************************************************
+ * Copyright © 2014 VLC authors and VideoLAN
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#ifdef _WIN32
+#include <winsock2.h>
+
+/* FILETIME of Jan 1 1970 00:00:00. */
+static const unsigned __int64 epoch = 116444736000000000;
+
+/*
+ * timezone information is stored outside the kernel so tzp isn't used anymore.
+ *
+ * Note: this function is not for Win32 high precision timing purpose. See
+ * elapsed_time().
+ */
+int gettimeofday(struct timeval * tp, struct timezone * tzp)
+{
+    FILETIME       file_time;
+    SYSTEMTIME     system_time;
+    ULARGE_INTEGER ularge;
+
+    GetSystemTime(&system_time);
+    SystemTimeToFileTime(&system_time, &file_time);
+    ularge.LowPart  = file_time.dwLowDateTime;
+    ularge.HighPart = file_time.dwHighDateTime;
+
+    tp->tv_sec  = (long) ((ularge.QuadPart - epoch) / 10000000L);
+    tp->tv_usec = (long) (system_time.wMilliseconds * 1000);
+
+    return 0;
+}
+#endif /* _WIN32 */

configure.ac

@@ -576,6 +576,7 @@ dnl Check for usual libc functions
 AC_CHECK_DECLS([nanosleep],,,[#include <time.h>])
 AC_CHECK_FUNCS([daemon fcntl flock fstatvfs fork getenv getpwuid_r isatty lstat memalign mkostemp mmap open_memstream openat pread posix_fadvise posix_madvise setlocale stricmp strnicmp strptime uselocale pthread_cond_timedwait_monotonic_np pthread_condattr_setclock])
 AC_REPLACE_FUNCS([atof atoll dirfd fdopendir ffsll flockfile fsync getdelim getpid lldiv nrand48 poll posix_memalign recvmsg rewind sendmsg setenv strcasecmp strcasestr strdup strlcpy strndup strnlen strnstr strsep strtof strtok_r strtoll swab tdestroy timegm timespec_get strverscmp])
+AC_REPLACE_FUNCS([gettimeofday])
 AC_CHECK_FUNCS(fdatasync,,
   [AC_DEFINE(fdatasync, fsync, [Alias fdatasync() to fsync() if missing.])
 ])

include/vlc_fixups.h

@@ -45,6 +45,14 @@
 # include <time.h> /* time_t */
 #endif
 
+#ifndef HAVE_GETTIMEOFDAY
+#ifdef _WIN32
+#include <winsock2.h>
+#else
+#include <sys/time.h>
+#endif
+#endif
+
 #ifndef HAVE_LLDIV
 typedef struct
 {
@@ -209,6 +217,11 @@ struct timespec;
 int timespec_get(struct timespec *, int);
 #endif
 
+/* sys/time.h */
+#ifndef HAVE_GETTIMEOFDAY
+int gettimeofday(struct timeval *, struct timezone *);
+#endif
+
 /* unistd.h */
 #ifndef HAVE_GETPID
 pid_t getpid (void) VLC_NOTHROW;