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-rw-r--r--src/polyp/timeval.c142
1 files changed, 142 insertions, 0 deletions
diff --git a/src/polyp/timeval.c b/src/polyp/timeval.c
new file mode 100644
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--- /dev/null
+++ b/src/polyp/timeval.c
@@ -0,0 +1,142 @@
+/* $Id$ */
+
+/***
+ This file is part of polypaudio.
+
+ polypaudio 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.
+
+ polypaudio 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 polypaudio; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <assert.h>
+#include <stddef.h>
+#include <sys/time.h>
+
+#ifdef HAVE_WINDOWS_H
+#include <windows.h>
+#endif
+
+#include "../polypcore/winsock.h"
+
+#include "timeval.h"
+
+struct timeval *pa_gettimeofday(struct timeval *tv) {
+#ifdef HAVE_GETTIMEOFDAY
+ assert(tv);
+
+ return gettimeofday(tv, NULL) < 0 ? NULL : tv;
+#elif defined(OS_IS_WIN32)
+ /*
+ * Copied from implementation by Steven Edwards (LGPL).
+ * Found on wine mailing list.
+ */
+
+#if defined(_MSC_VER) || defined(__BORLANDC__)
+#define EPOCHFILETIME (116444736000000000i64)
+#else
+#define EPOCHFILETIME (116444736000000000LL)
+#endif
+
+ FILETIME ft;
+ LARGE_INTEGER li;
+ __int64 t;
+
+ assert(tv);
+
+ GetSystemTimeAsFileTime(&ft);
+ li.LowPart = ft.dwLowDateTime;
+ li.HighPart = ft.dwHighDateTime;
+ t = li.QuadPart; /* In 100-nanosecond intervals */
+ t -= EPOCHFILETIME; /* Offset to the Epoch time */
+ t /= 10; /* In microseconds */
+ tv->tv_sec = (long)(t / 1000000);
+ tv->tv_usec = (long)(t % 1000000);
+
+ return tv;
+#else
+#error "Platform lacks gettimeofday() or equivalent function."
+#endif
+}
+
+pa_usec_t pa_timeval_diff(const struct timeval *a, const struct timeval *b) {
+ pa_usec_t r;
+ assert(a && b);
+
+ /* Check which whan is the earlier time and swap the two arguments if reuqired. */
+ if (pa_timeval_cmp(a, b) < 0) {
+ const struct timeval *c;
+ c = a;
+ a = b;
+ b = c;
+ }
+
+ /* Calculate the second difference*/
+ r = ((pa_usec_t) a->tv_sec - b->tv_sec)* 1000000;
+
+ /* Calculate the microsecond difference */
+ if (a->tv_usec > b->tv_usec)
+ r += ((pa_usec_t) a->tv_usec - b->tv_usec);
+ else if (a->tv_usec < b->tv_usec)
+ r -= ((pa_usec_t) b->tv_usec - a->tv_usec);
+
+ return r;
+}
+
+int pa_timeval_cmp(const struct timeval *a, const struct timeval *b) {
+ assert(a && b);
+
+ if (a->tv_sec < b->tv_sec)
+ return -1;
+
+ if (a->tv_sec > b->tv_sec)
+ return 1;
+
+ if (a->tv_usec < b->tv_usec)
+ return -1;
+
+ if (a->tv_usec > b->tv_usec)
+ return 1;
+
+ return 0;
+}
+
+pa_usec_t pa_timeval_age(const struct timeval *tv) {
+ struct timeval now;
+ assert(tv);
+
+ return pa_timeval_diff(pa_gettimeofday(&now), tv);
+}
+
+struct timeval* pa_timeval_add(struct timeval *tv, pa_usec_t v) {
+ unsigned long secs;
+ assert(tv);
+
+ secs = (v/1000000);
+ tv->tv_sec += (unsigned long) secs;
+ v -= secs*1000000;
+
+ tv->tv_usec += v;
+
+ /* Normalize */
+ while (tv->tv_usec >= 1000000) {
+ tv->tv_sec++;
+ tv->tv_usec -= 1000000;
+ }
+
+ return tv;
+}