[PATCH v3 07/13] add range clone functions

[Bo Yang <struggleyb.nku@gmail.com>]

Both single range clone and deeply clone are supported.

Signed-off-by: Bo Yang <struggleyb.nku@gmail.com>
---
 line.c |   39 +++++++++++++++++++++++++++++++++++++++
 line.h |    4 ++++
 2 files changed, 43 insertions(+), 0 deletions(-)

diff --git a/line.c b/line.c
index a6bcbdf..ba96d7d 100644
--- a/line.c
+++ b/line.c
@@ -378,6 +378,45 @@ void diff_line_range_append(struct diff_line_range *r, const char *arg)
 	r->ranges[r->nr - 1].arg = arg;
 }
 
+struct diff_line_range *diff_line_range_clone(struct diff_line_range *r)
+{
+	struct diff_line_range *ret = xmalloc(sizeof(*ret));
+	int i = 0;
+
+	DIFF_LINE_RANGE_INIT(ret);
+	ret->ranges = xcalloc(r->nr, sizeof(struct range));
+	memcpy(ret->ranges, r->ranges, sizeof(struct range) * r->nr);
+
+	ret->alloc = ret->nr = r->nr;
+
+	for (; i < ret->nr; i++)
+		PRINT_PAIR_INIT(&ret->ranges[i].pair);
+
+	ret->spec = r->spec;
+	assert(ret->spec);
+	ret->spec->count++;
+
+	return ret;
+}
+
+struct diff_line_range *diff_line_range_clone_deeply(struct diff_line_range *r)
+{
+	struct diff_line_range *ret = NULL;
+	struct diff_line_range *tmp = NULL, *prev = NULL;
+
+	assert(r);
+	ret = tmp = prev = diff_line_range_clone(r);
+	r = r->next;
+	while (r) {
+		tmp = diff_line_range_clone(r);
+		prev->next = tmp;
+		prev = tmp;
+		r = r->next;
+	}
+
+	return ret;
+}
+
 struct diff_line_range *diff_line_range_merge(struct diff_line_range *out,
 	struct diff_line_range *other)
 {
diff --git a/line.h b/line.h
index 0eb03bd..885e985 100644
--- a/line.h
+++ b/line.h
@@ -112,6 +112,10 @@ extern void diff_line_range_append(struct diff_line_range *r, const char *arg);
 
 extern void diff_line_range_clear(struct diff_line_range *r);
 
+extern struct diff_line_range *diff_line_range_clone(struct diff_line_range *r);
+
+extern struct diff_line_range *diff_line_range_clone_deeply(struct diff_line_range *r);
+
 extern struct diff_line_range *diff_line_range_merge(struct diff_line_range *out,
 	struct diff_line_range *other);
 
-- 
1.7.0.2.273.gc2413.dirty