path-list.c

   1 #include <stdio.h>
   2 #include "cache.h"
   3 #include "path-list.h"
   4
   5 /* if there is no exact match, point to the index where the entry could be
   6  * inserted */
   7 static int get_entry_index(const struct path_list *list, const char *path,
   8                 int *exact_match)
   9 {
  10         int left = -1, right = list->nr;
  11
  12         while (left + 1 < right) {
  13                 int middle = (left + right) / 2;
  14                 int compare = strcmp(path, list->items[middle].path);
  15                 if (compare < 0)
  16                         right = middle;
  17                 else if (compare > 0)
  18                         left = middle;
  19                 else {
  20                         *exact_match = 1;
  21                         return middle;
  22                 }
  23         }
  24
  25         *exact_match = 0;
  26         return right;
  27 }
  28
  29 /* returns -1-index if already exists */
  30 static int add_entry(struct path_list *list, const char *path)
  31 {
  32         int exact_match;
  33         int index = get_entry_index(list, path, &exact_match);
  34
  35         if (exact_match)
  36                 return -1 - index;
  37
  38         if (list->nr + 1 >= list->alloc) {
  39                 list->alloc += 32;
  40                 list->items = xrealloc(list->items, list->alloc
  41                                 * sizeof(struct path_list_item));
  42         }
  43         if (index < list->nr)
  44                 memmove(list->items + index + 1, list->items + index,
  45                                 (list->nr - index)
  46                                 * sizeof(struct path_list_item));
  47         list->items[index].path = list->strdup_paths ?
  48                 xstrdup(path) : (char *)path;
  49         list->items[index].util = NULL;
  50         list->nr++;
  51
  52         return index;
  53 }
  54
  55 struct path_list_item *path_list_insert(const char *path, struct path_list *list)
  56 {
  57         int index = add_entry(list, path);
  58
  59         if (index < 0)
  60                 index = 1 - index;
  61
  62         return list->items + index;
  63 }
  64
  65 int path_list_has_path(const struct path_list *list, const char *path)
  66 {
  67         int exact_match;
  68         get_entry_index(list, path, &exact_match);
  69         return exact_match;
  70 }
  71
  72 struct path_list_item *path_list_lookup(const char *path, struct path_list *list)
  73 {
  74         int exact_match, i = get_entry_index(list, path, &exact_match);
  75         if (!exact_match)
  76                 return NULL;
  77         return list->items + i;
  78 }
  79
  80 void path_list_clear(struct path_list *list, int free_items)
  81 {
  82         if (list->items) {
  83                 int i;
  84                 if (free_items)
  85                         for (i = 0; i < list->nr; i++) {
  86                                 if (list->strdup_paths)
  87                                         free(list->items[i].path);
  88                                 free(list->items[i].util);
  89                         }
  90                 free(list->items);
  91         }
  92         list->items = NULL;
  93         list->nr = list->alloc = 0;
  94 }
  95
  96 void print_path_list(const char *text, const struct path_list *p)
  97 {
  98         int i;
  99         if ( text )
 100                 printf("%s\n", text);
 101         for (i = 0; i < p->nr; i++)
 102                 printf("%s:%p\n", p->items[i].path, p->items[i].util);
 103 }
 104