Allow pack header preprocessing before unpack-objects/index-pack.
[git] / 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