[PATCH 3/3] string-list: use QSORT_S in string_list_sort()

["René Scharfe" <l.s.r@web.de>]

Pass the comparison function to cmp_items() via the context parameter of
qsort_s() instead of using a global variable.  That allows calling
string_list_sort() from multiple parallel threads.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
---
 string-list.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/string-list.c b/string-list.c
index 8c83cac18..45016ad86 100644
--- a/string-list.c
+++ b/string-list.c
@@ -211,21 +211,18 @@ struct string_list_item *string_list_append(struct string_list *list,
 			list->strdup_strings ? xstrdup(string) : (char *)string);
 }
 
-/* Yuck */
-static compare_strings_fn compare_for_qsort;
-
-/* Only call this from inside string_list_sort! */
-static int cmp_items(const void *a, const void *b)
+static int cmp_items(const void *a, const void *b, void *ctx)
 {
+	compare_strings_fn cmp = ctx;
 	const struct string_list_item *one = a;
 	const struct string_list_item *two = b;
-	return compare_for_qsort(one->string, two->string);
+	return cmp(one->string, two->string);
 }
 
 void string_list_sort(struct string_list *list)
 {
-	compare_for_qsort = list->cmp ? list->cmp : strcmp;
-	QSORT(list->items, list->nr, cmp_items);
+	QSORT_S(list->items, list->nr, cmp_items,
+		list->cmp ? list->cmp : strcmp);
 }
 
 struct string_list_item *unsorted_string_list_lookup(struct string_list *list,
-- 
2.11.0