Update diff to use iterators

This is a major reorganization of the diff code.  This changes
the diff functions to use the iterators for traversing the
content.  This allowed a lot of code to be simplified.  Also,
this moved the functions relating to outputting a diff into a
new file (diff_output.c).

This includes a number of other changes - adding utility
functions, extending iterators, etc. plus more tests for the
diff code.  This also takes the example diff.c program much
further in terms of emulating git-diff command line options.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/vector.c b/src/vector.c
index e109704ab..7513ea3f0 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -220,4 +220,14 @@ void git_vector_clear(git_vector *v)
 	v->sorted = 1;
 }
 
+void git_vector_swap(git_vector *a, git_vector *b)
+{
+	git_vector t;
+
+	if (!a || !b || a == b)
+		return;
 
+	memcpy(&t, a, sizeof(t));
+	memcpy(a, b, sizeof(t));
+	memcpy(b, &t, sizeof(t));
+}