vector: implement git_vector_uniq()

The routine remove duplictes from the vector. Only the last added element
of elements with equal keys remains in the vector.

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/vector.c b/src/vector.c
index 8d09350fc..2fc051f0c 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -162,6 +162,26 @@ int git_vector_remove(git_vector *v, unsigned int idx)
 	return GIT_SUCCESS;
 }
 
+void git_vector_uniq(git_vector *v)
+{
+	git_vector_cmp cmp;
+	unsigned int i, j;
+
+	if (v->length <= 1)
+		return;
+
+	git_vector_sort(v);
+	cmp = v->_cmp ? v->_cmp : strict_comparison;
+
+	for (i = 0, j = 1 ; j < v->length; ++j)
+		if (!cmp(v->contents + i, v->contents + j))
+			v->contents[i] = v->contents[j];
+		else
+			v->contents[++i] = v->contents[j];
+
+	v->length -= j - i - 1;
+}
+
 void git_vector_clear(git_vector *v)
 {
 	assert(v);