t/helper/test-mergesort.c

   1 #include "cache.h"
   2 #include "mergesort.h"
   3
   4 struct line {
   5         char *text;
   6         struct line *next;
   7 };
   8
   9 static void *get_next(const void *a)
  10 {
  11         return ((const struct line *)a)->next;
  12 }
  13
  14 static void set_next(void *a, void *b)
  15 {
  16         ((struct line *)a)->next = b;
  17 }
  18
  19 static int compare_strings(const void *a, const void *b)
  20 {
  21         const struct line *x = a, *y = b;
  22         return strcmp(x->text, y->text);
  23 }
  24
  25 int cmd_main(int argc, const char **argv)
  26 {
  27         struct line *line, *p = NULL, *lines = NULL;
  28         struct strbuf sb = STRBUF_INIT;
  29
  30         for (;;) {
  31                 if (strbuf_getwholeline(&sb, stdin, '\n'))
  32                         break;
  33                 line = xmalloc(sizeof(struct line));
  34                 line->text = strbuf_detach(&sb, NULL);
  35                 if (p) {
  36                         line->next = p->next;
  37                         p->next = line;
  38                 } else {
  39                         line->next = NULL;
  40                         lines = line;
  41                 }
  42                 p = line;
  43         }
  44
  45         lines = llist_mergesort(lines, get_next, set_next, compare_strings);
  46
  47         while (lines) {
  48                 printf("%s", lines->text);
  49                 lines = lines->next;
  50         }
  51         return 0;
  52 }