[PATCH 01/15] string_list: add string_list_duplicate

[Stefan Beller <sbeller@google.com>]

The result of git_config_get_value_multi do not seem to be stable and
may get overwritten. Have an easy way to preserve the results of that
query.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 string-list.c | 18 ++++++++++++++++++
 string-list.h |  2 ++
 2 files changed, 20 insertions(+)

diff --git a/string-list.c b/string-list.c
index 2a32a3f..f981c8a 100644
--- a/string-list.c
+++ b/string-list.c
@@ -7,6 +7,24 @@ void string_list_init(struct string_list *list, int strdup_strings)
 	list->strdup_strings = strdup_strings;
 }
 
+struct string_list *string_list_duplicate(const struct string_list *src,
+					  int strdup_strings)
+{
+	struct string_list *list;
+	struct string_list_item *item;
+
+	if (!src)
+		return NULL;
+
+	list = xmalloc(sizeof(*list));
+	string_list_init(list, strdup_strings);
+	for_each_string_list_item(item, src)
+		string_list_append(list, item->string);
+
+	return list;
+}
+
+
 /* if there is no exact match, point to the index where the entry could be
  * inserted */
 static int get_entry_index(const struct string_list *list, const char *string,
diff --git a/string-list.h b/string-list.h
index d3809a1..1a5612f 100644
--- a/string-list.h
+++ b/string-list.h
@@ -19,6 +19,8 @@ struct string_list {
 #define STRING_LIST_INIT_DUP   { NULL, 0, 0, 1, NULL }
 
 void string_list_init(struct string_list *list, int strdup_strings);
+struct string_list *string_list_duplicate(const struct string_list *src,
+					  int strdup_strings);
 
 void print_string_list(const struct string_list *p, const char *text);
 void string_list_clear(struct string_list *list, int free_util);
-- 
2.8.0.41.g8d9aeb3