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c2b67043 | 1 | /* |
359fc2d2 | 2 | * Copyright (C) the libgit2 contributors. All rights reserved. |
c2b67043 RB |
3 | * |
4 | * This file is part of libgit2, distributed under the GNU GPL v2 with | |
5 | * a Linking Exception. For full terms see the included COPYING file. | |
6 | */ | |
7 | #ifndef INCLUDE_strmap_h__ | |
8 | #define INCLUDE_strmap_h__ | |
9 | ||
10 | #include "common.h" | |
11 | ||
22a2d3d5 | 12 | /** A map with C strings as key. */ |
ac3d33df | 13 | typedef struct kh_str_s git_strmap; |
c2b67043 | 14 | |
22a2d3d5 UG |
15 | /** |
16 | * Allocate a new string map. | |
17 | * | |
18 | * @param out Pointer to the map that shall be allocated. | |
19 | * @return 0 on success, an error code if allocation has failed. | |
20 | */ | |
21 | int git_strmap_new(git_strmap **out); | |
22 | ||
23 | /** | |
24 | * Free memory associated with the map. | |
25 | * | |
26 | * Note that this function will _not_ free keys or values added | |
27 | * to this map. | |
28 | * | |
29 | * @param map Pointer to the map that is to be free'd. May be | |
30 | * `NULL`. | |
31 | */ | |
94af9155 | 32 | void git_strmap_free(git_strmap *map); |
22a2d3d5 UG |
33 | |
34 | /** | |
35 | * Clear all entries from the map. | |
36 | * | |
37 | * This function will remove all entries from the associated map. | |
38 | * Memory associated with it will not be released, though. | |
39 | * | |
40 | * @param map Pointer to the map that shall be cleared. May be | |
41 | * `NULL`. | |
42 | */ | |
a13cfd2a | 43 | void git_strmap_clear(git_strmap *map); |
c2b67043 | 44 | |
22a2d3d5 UG |
45 | /** |
46 | * Return the number of elements in the map. | |
47 | * | |
48 | * @parameter map map containing the elements | |
49 | * @return number of elements in the map | |
50 | */ | |
51 | size_t git_strmap_size(git_strmap *map); | |
c2b67043 | 52 | |
22a2d3d5 UG |
53 | /** |
54 | * Return value associated with the given key. | |
55 | * | |
56 | * @param map map to search key in | |
57 | * @param key key to search for | |
58 | * @return value associated with the given key or NULL if the key was not found | |
59 | */ | |
60 | void *git_strmap_get(git_strmap *map, const char *key); | |
c2b67043 | 61 | |
22a2d3d5 UG |
62 | /** |
63 | * Set the entry for key to value. | |
64 | * | |
65 | * If the map has no corresponding entry for the given key, a new | |
66 | * entry will be created with the given value. If an entry exists | |
67 | * already, its value will be updated to match the given value. | |
68 | * | |
69 | * @param map map to create new entry in | |
70 | * @param key key to set | |
71 | * @param value value to associate the key with; may be NULL | |
72 | * @return zero if the key was successfully set, a negative error | |
73 | * code otherwise | |
74 | */ | |
75 | int git_strmap_set(git_strmap *map, const char *key, void *value); | |
76 | ||
77 | /** | |
78 | * Delete an entry from the map. | |
79 | * | |
80 | * Delete the given key and its value from the map. If no such | |
81 | * key exists, this will do nothing. | |
82 | * | |
83 | * @param map map to delete key in | |
84 | * @param key key to delete | |
85 | * @return `0` if the key has been deleted, GIT_ENOTFOUND if no | |
86 | * such key was found, a negative code in case of an | |
87 | * error | |
88 | */ | |
89 | int git_strmap_delete(git_strmap *map, const char *key); | |
90 | ||
91 | /** | |
92 | * Check whether a key exists in the given map. | |
93 | * | |
94 | * @param map map to query for the key | |
95 | * @param key key to search for | |
96 | * @return 0 if the key has not been found, 1 otherwise | |
97 | */ | |
a13cfd2a | 98 | int git_strmap_exists(git_strmap *map, const char *key); |
22a2d3d5 UG |
99 | |
100 | /** | |
101 | * Iterate over entries of the map. | |
102 | * | |
103 | * This functions allows to iterate over all key-value entries of | |
104 | * the map. The current position is stored in the `iter` variable | |
105 | * and should be initialized to `0` before the first call to this | |
106 | * function. | |
107 | * | |
108 | * @param map map to iterate over | |
109 | * @param value pointer to the variable where to store the current | |
110 | * value. May be NULL. | |
111 | * @param iter iterator storing the current position. Initialize | |
112 | * with zero previous to the first call. | |
113 | * @param key pointer to the variable where to store the current | |
114 | * key. May be NULL. | |
115 | * @return `0` if the next entry was correctly retrieved. | |
116 | * GIT_ITEROVER if no entries are left. A negative error | |
117 | * code otherwise. | |
118 | */ | |
119 | int git_strmap_iterate(void **value, git_strmap *map, size_t *iter, const char **key); | |
120 | ||
121 | #define git_strmap_foreach(h, kvar, vvar, code) { size_t __i = 0; \ | |
122 | while (git_strmap_iterate((void **) &(vvar), h, &__i, &(kvar)) == 0) { \ | |
ac3d33df JK |
123 | code; \ |
124 | } } | |
125 | ||
22a2d3d5 UG |
126 | #define git_strmap_foreach_value(h, vvar, code) { size_t __i = 0; \ |
127 | while (git_strmap_iterate((void **) &(vvar), h, &__i, NULL) == 0) { \ | |
ac3d33df JK |
128 | code; \ |
129 | } } | |
c2b67043 RB |
130 | |
131 | #endif |