path-list.c

   1 #include "cache.h"
   2 #include "path-list.h"
   3
   4 /* if there is no exact match, point to the index where the entry could be
   5  * inserted */
   6 static int get_entry_index(const struct path_list *list, const char *path,
   7                 int *exact_match)
   8 {
   9         int left = -1, right = list->nr;
  10
  11         while (left + 1 < right) {
  12                 int middle = (left + right) / 2;
  13                 int compare = strcmp(path, list->items[middle].path);
  14                 if (compare < 0)
  15                         right = middle;
  16                 else if (compare > 0)
  17                         left = middle;
  18                 else {
  19                         *exact_match = 1;
  20                         return middle;
  21                 }
  22         }
  23
  24         *exact_match = 0;
  25         return right;
  26 }
  27
  28 /* returns -1-index if already exists */
  29 static int add_entry(struct path_list *list, const char *path)
  30 {
  31         int exact_match;
  32         int index = get_entry_index(list, path, &exact_match);
  33
  34         if (exact_match)
  35                 return -1 - index;
  36
  37         if (list->nr + 1 >= list->alloc) {
  38                 list->alloc += 32;
  39                 list->items = xrealloc(list->items, list->alloc
  40                                 * sizeof(struct path_list_item));
  41         }
  42         if (index < list->nr)
  43                 memmove(list->items + index + 1, list->items + index,
  44                                 (list->nr - index)
  45                                 * sizeof(struct path_list_item));
  46         list->items[index].path = list->strdup_paths ?
  47                 xstrdup(path) : (char *)path;
  48         list->items[index].util = NULL;
  49         list->nr++;
  50
  51         return index;
  52 }
  53
  54 struct path_list_item *path_list_insert(const char *path, struct path_list *list)
  55 {
  56         int index = add_entry(list, path);
  57
  58         if (index < 0)
  59                 index = -1 - index;
  60
  61         return list->items + index;
  62 }
  63
  64 int path_list_has_path(const struct path_list *list, const char *path)
  65 {
  66         int exact_match;
  67         get_entry_index(list, path, &exact_match);
  68         return exact_match;
  69 }
  70
  71 struct path_list_item *path_list_lookup(const char *path, struct path_list *list)
  72 {
  73         int exact_match, i = get_entry_index(list, path, &exact_match);
  74         if (!exact_match)
  75                 return NULL;
  76         return list->items + i;
  77 }
  78
  79 void path_list_clear(struct path_list *list, int free_items)
  80 {
  81         if (list->items) {
  82                 int i;
  83                 if (free_items)
  84                         for (i = 0; i < list->nr; i++) {
  85                                 if (list->strdup_paths)
  86                                         free(list->items[i].path);
  87                                 free(list->items[i].util);
  88                         }
  89                 free(list->items);
  90         }
  91         list->items = NULL;
  92         list->nr = list->alloc = 0;
  93 }
  94
  95 void print_path_list(const char *text, const struct path_list *p)
  96 {
  97         int i;
  98         if ( text )
  99                 printf("%s\n", text);
 100         for (i = 0; i < p->nr; i++)
 101                 printf("%s:%p\n", p->items[i].path, p->items[i].util);
 102 }