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-rw-r--r--t/helper/test-mergesort.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/t/helper/test-mergesort.c b/t/helper/test-mergesort.c
new file mode 100644
index 0000000000..ea3b959e94
--- /dev/null
+++ b/t/helper/test-mergesort.c
@@ -0,0 +1,52 @@
+#include "cache.h"
+#include "mergesort.h"
+
+struct line {
+ char *text;
+ struct line *next;
+};
+
+static void *get_next(const void *a)
+{
+ return ((const struct line *)a)->next;
+}
+
+static void set_next(void *a, void *b)
+{
+ ((struct line *)a)->next = b;
+}
+
+static int compare_strings(const void *a, const void *b)
+{
+ const struct line *x = a, *y = b;
+ return strcmp(x->text, y->text);
+}
+
+int main(int argc, char **argv)
+{
+ struct line *line, *p = NULL, *lines = NULL;
+ struct strbuf sb = STRBUF_INIT;
+
+ for (;;) {
+ if (strbuf_getwholeline(&sb, stdin, '\n'))
+ break;
+ line = xmalloc(sizeof(struct line));
+ line->text = strbuf_detach(&sb, NULL);
+ if (p) {
+ line->next = p->next;
+ p->next = line;
+ } else {
+ line->next = NULL;
+ lines = line;
+ }
+ p = line;
+ }
+
+ lines = llist_mergesort(lines, get_next, set_next, compare_strings);
+
+ while (lines) {
+ printf("%s", lines->text);
+ lines = lines->next;
+ }
+ return 0;
+}