add a library of timeval manipulation functions, and change a large number of usses to use the new functions (bug #4504)

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@6146 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 98 insertions, 2 deletions

diff --git a/include/asterisk/time.h b/include/asterisk/time.h
index ec7a51d8d..82b781125 100755
--- a/include/asterisk/time.h
+++ b/include/asterisk/time.h
@@ -23,9 +23,105 @@
  * \return the difference in milliseconds
  */
 AST_INLINE_API(
-int ast_tvdiff_ms(const struct timeval *end, const struct timeval *start),
+int ast_tvdiff_ms(struct timeval end, struct timeval start),
 {
-	return ((end->tv_sec - start->tv_sec) * 1000) + ((end->tv_usec - start->tv_usec) / 1000);
+	return ((end.tv_sec - start.tv_sec) * 1000) + ((end.tv_usec - start.tv_usec) / 1000);
+}
+)
+
+/*!
+ * \brief Returns true if the argument is 0,0
+ */
+AST_INLINE_API(
+int ast_tvzero(const struct timeval t),
+{
+	return (t.tv_sec == 0 && t.tv_usec == 0);
+}
+)
+
+/*!
+ * \brief Compres two \c struct \c timeval instances returning
+ * -1, 0, 1 if the first arg is smaller, equal or greater to the second.
+ */
+AST_INLINE_API(
+int ast_tvcmp(struct timeval _a, struct timeval _b),
+{
+	if (_a.tv_sec < _b.tv_sec)
+		return -1;
+	if (_a.tv_sec > _b.tv_sec)
+		return 1;
+	/* now seconds are equal */
+	if (_a.tv_usec < _b.tv_usec)
+		return -1;
+	if (_a.tv_usec > _b.tv_usec)
+		return 1;
+	return 0;
+}
+)
+
+/*!
+ * \brief Returns true if the two \c struct \c timeval arguments are equal.
+ */
+AST_INLINE_API(
+int ast_tveq(struct timeval _a, struct timeval _b),
+{
+	return (_a.tv_sec == _b.tv_sec && _a.tv_usec == _b.tv_usec);
+}
+)
+
+/*!
+ * \brief Returns current timeval. Meant to replace calls to gettimeofday().
+ */
+AST_INLINE_API(
+struct timeval ast_tvnow(void),
+{
+	struct timeval t;
+	gettimeofday(&t, NULL);
+	return t;
+}
+)
+
+/*!
+ * \brief Returns the sum of two timevals a + b
+ */
+struct timeval ast_tvadd(struct timeval a, struct timeval b);
+
+/*!
+ * \brief Returns the difference of two timevals a - b
+ */
+struct timeval ast_tvsub(struct timeval a, struct timeval b);
+
+/*!
+ * \brief Returns a timeval from sec, usec
+ */
+#if 0
+AST_INLINE_API(
+struct timeval ast_tv(int sec, int usec),
+{
+	struct timeval t = { sec, usec};
+	return t;
+}
+)
+#endif
+AST_INLINE_API(
+struct timeval ast_tv(int sec, int usec),
+{
+	struct timeval t;
+	t.tv_sec = sec;
+	t.tv_usec = usec;
+	return t;
+}
+)
+
+/*!
+ * \brief Returns a timeval corresponding to the duration of n samples at rate r.
+ * Useful to convert samples to timevals, or even milliseconds to timevals
+ * in the form ast_samp2tv(milliseconds, 1000)
+ */
+AST_INLINE_API(
+struct timeval ast_samp2tv(long _nsamp, long _rate),
+{
+	return ast_tv(_nsamp / _rate, (_nsamp % _rate) * (1000000 / _rate));
 }
 )