From b7d039a32c7904739f56b5fec2103f612028ca88 Mon Sep 17 00:00:00 2001
From: Laurence Withers <lwithers@amethyst.(none)>
Date: Fri, 29 May 2009 14:51:14 +0000
Subject: [PATCH] Add iso8601_elapsed_divide()

---
 src/libiso8601/400_manip.c | 25 +++++++++++++++++++++++++
 src/libiso8601/400_manip.h | 21 +++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/src/libiso8601/400_manip.c b/src/libiso8601/400_manip.c
index c6ce9a8..40a0dd8 100644
--- a/src/libiso8601/400_manip.c
+++ b/src/libiso8601/400_manip.c
@@ -160,6 +160,31 @@ void iso8601_difference(const struct iso8601_date* d1, const struct iso8601_date
 
 
 
+int iso8601_elapsed_div(const struct iso8601_elapsed* num, const struct iso8601_elapsed* denom,
+    struct iso8601_elapsed* remain)
+{
+    unsigned long long pnum, pdenom;
+    lldiv_t val, v2;
+
+    pnum = num->sec;
+    pnum *= BILLION;
+    pnum += num->nsec;
+
+    pdenom = denom->sec;
+    pdenom *= BILLION;
+    pdenom += denom->nsec;
+
+    val = lldiv(pnum, pdenom);
+    if(remain) {
+        v2 = lldiv(val.rem, BILLION);
+        remain->sec = v2.quot;
+        remain->nsec = v2.rem;
+    }
+    return val.quot;
+}
+
+
+
 /* options for text editors
 kate: replace-trailing-space-save true; space-indent true; tab-width 4;
 vim: expandtab:ts=4:sw=4
diff --git a/src/libiso8601/400_manip.h b/src/libiso8601/400_manip.h
index dd80360..b7faf39 100644
--- a/src/libiso8601/400_manip.h
+++ b/src/libiso8601/400_manip.h
@@ -117,6 +117,27 @@ void iso8601_difference(const struct iso8601_date* d1, const struct iso8601_date
 
 
 
+/*! \brief Divide one period by another.
+
+\param num Numerator.
+\param denom Denominator (divisor).
+\param[out] remain Remainder. May be 0.
+\returns Number of times \a denom divides into \a num.
+
+This function computes the number of times that \a denom can be divided into \a num, returning that
+number. If desired, the remaining period which could not be divided can be written into \a remain.
+Uses 64-bit arithmetic internally.
+
+*/
+int iso8601_elapsed_div(const struct iso8601_elapsed* num, const struct iso8601_elapsed* denom,
+    struct iso8601_elapsed* remain)
+#ifndef DOXYGEN
+    __attribute__((nonnull(1,2)));
+#endif
+;
+
+
+
 /*!@}*/
 /* options for text editors
 kate: replace-trailing-space-save true; space-indent true; tab-width 4;