10 static void *get_next(const void *a)
12 return ((const struct line *)a)->next;
15 static void set_next(void *a, void *b)
17 ((struct line *)a)->next = b;
20 static int compare_strings(const void *a, const void *b)
22 const struct line *x = a, *y = b;
23 return strcmp(x->text, y->text);
26 int cmd__mergesort(int argc, const char **argv)
28 struct line *line, *p = NULL, *lines = NULL;
29 struct strbuf sb = STRBUF_INIT;
32 if (strbuf_getwholeline(&sb, stdin, '\n'))
34 line = xmalloc(sizeof(struct line));
35 line->text = strbuf_detach(&sb, NULL);
46 lines = llist_mergesort(lines, get_next, set_next, compare_strings);
49 printf("%s", lines->text);