3 /* dict_cursor - iterators over dictionnaries */
5 /* Authors: Martin Quinson */
6 /* Copyright (C) 2003,2004 Martin Quinson. */
8 /* This program is free software; you can redistribute it and/or modify it
9 under the terms of the license (GNU LGPL) which comes with this package. */
12 #include "dict_private.h"
14 #include <string.h> /* strlen() */
16 GRAS_LOG_EXTERNAL_CATEGORY(dict);
17 GRAS_LOG_NEW_DEFAULT_SUBCATEGORY(dict_cursor,dict,"To traverse dictionaries");
20 /*####[ Dict cursor functions ]#############################################*/
21 /* To traverse (simple) dicts */
22 /* Don't add or remove entries to the dict while traversing !!! */
23 /*###########################################################################*/
24 struct gras_dict_cursor_ {
25 /* we store all level encountered until here, to backtrack on next() */
27 gras_dynar_t *key_lens;
33 static _GRAS_INLINE void
34 _cursor_push_keys(gras_dict_cursor_t *p_cursor,
35 gras_dictelm_t *p_elm);
37 #undef gras_dict_CURSOR_DEBUG
38 /*#define gras_dict_CURSOR_DEBUG 1*/
41 * gras_dict_cursor_new:
43 * @head: the head of the dict
44 * @cursor: the curent position in the dict
49 gras_dict_cursor_new(const gras_dict_t *p_head) {
50 gras_error_t errcode = no_error;
51 gras_dict_cursor_t *res = NULL;
53 res = gras_new(gras_dict_cursor_t,1);
54 res->keys = gras_dynar_new(sizeof(char **), NULL);
55 res->key_lens = gras_dynar_new(sizeof(int *), NULL);
58 res->head = p_head ? p_head->head : NULL;
60 gras_dict_cursor_rewind(res);
66 * gras_dict_cursor_free:
68 * @cursor: poor victim
70 * Structure destructor
73 gras_dict_cursor_free(gras_dict_cursor_t *p_cursor) {
75 gras_dynar_free(p_cursor->keys);
76 gras_dynar_free(p_cursor->key_lens);
77 memset(p_cursor, 0, sizeof(gras_dict_cursor_t));
85 * Sanity check to see if the head contains something
89 __cursor_not_null(gras_dict_cursor_t *p_cursor) {
91 gras_assert0(p_cursor, "Null cursor");
93 if (!p_cursor->head) {
94 return mismatch_error;
103 _cursor_push_keys(gras_dict_cursor_t *p_cursor,
104 gras_dictelm_t *p_elm) {
105 gras_error_t errcode = no_error;
106 gras_dictelm_t *p_child = NULL;
108 static volatile int count = 0; /* ??? */
110 CDEBUG1(dict_cursor, "Push childs of %p in the cursor", (void*)p_elm);
112 if (p_elm->content) {
113 gras_dynar_push(p_cursor->keys, &p_elm->key );
114 gras_dynar_push(p_cursor->key_lens, &p_elm->key_len);
118 gras_dynar_foreach(p_elm->sub, i, p_child) {
120 _cursor_push_keys(p_cursor, p_child);
123 CDEBUG1(dict_cursor, "Count = %d", count);
127 * gras_dict_cursor_rewind:
128 * @cursor: the cursor
129 * @Returns: gras_error_t
131 * back to the first element
134 gras_dict_cursor_rewind(gras_dict_cursor_t *p_cursor) {
135 gras_error_t errcode = no_error;
137 CDEBUG0(dict_cursor, "gras_dict_cursor_rewind");
138 gras_assert(p_cursor);
140 gras_dynar_reset(p_cursor->keys);
141 gras_dynar_reset(p_cursor->key_lens);
146 _cursor_push_keys(p_cursor, p_cursor->head);
148 gras_dynar_cursor_first(p_cursor->keys, &p_cursor->pos );
149 gras_dynar_cursor_first(p_cursor->key_lens, &p_cursor->pos_len);
154 * gras_dict_cursor_first:
155 * @dict: on what to let the cursor iterate
156 * @cursor: dest address
158 * Create the cursor if it does not exists. Rewind it in any case.
160 void gras_dict_cursor_first (const gras_dict_t *dict,
161 gras_dict_cursor_t **cursor){
164 DEBUG0("Create the cursor on first use");
165 *cursor=gras_dict_cursor_new(dict);
168 gras_dict_cursor_rewind(*cursor);
173 * gras_dict_cursor_step:
174 * @cursor: the cursor
176 * Move to the next element.
179 gras_dict_cursor_step(gras_dict_cursor_t *p_cursor) {
180 gras_assert(p_cursor);
182 gras_dynar_cursor_step(p_cursor->keys, &p_cursor->pos);
183 gras_dynar_cursor_step(p_cursor->key_lens, &p_cursor->pos_len);
187 * gras_dict_cursor_get_or_free:
188 * @cursor: the cursor
189 * @Returns: true if it's ok, false if there is no more data
194 gras_dict_cursor_get_or_free(gras_dict_cursor_t **cursor,
197 gras_error_t errcode = no_error;
200 if (!cursor || !(*cursor))
203 if (gras_dynar_length((*cursor)->keys) <= (*cursor)->pos) {
204 gras_dict_cursor_free(*cursor);
209 gras_dynar_get((*cursor)->keys, (*cursor)->pos, key );
210 gras_dynar_get((*cursor)->key_lens, (*cursor)->pos_len, &key_len);
212 errcode = gras_dictelm_get_ext((*cursor)->head, *key, key_len, data);
213 if (errcode == mismatch_error) {
214 gras_dict_cursor_free(*cursor);
219 gras_assert1(errcode == no_error,
220 "Unexpected problem while retrieving the content of cursor. Got %s",
221 gras_error_name(errcode));
227 * gras_dict_cursor_get_key:
228 * @cursor: the cursor
229 * @key: the current element
230 * @Returns: gras_error_t
235 gras_dict_cursor_get_key(gras_dict_cursor_t *p_cursor,
237 gras_error_t errcode = no_error;
239 TRY(__cursor_not_null(p_cursor));
241 gras_dynar_get(p_cursor->keys, p_cursor->pos - 1, key);
247 * gras_dict_cursor_get_data:
248 * @cursor: the cursor
253 gras_dict_cursor_get_data(gras_dict_cursor_t *p_cursor,
254 /*OUT*/void **data) {
255 gras_error_t errcode = no_error;
259 TRY(__cursor_not_null(p_cursor));
261 gras_dynar_get(p_cursor->keys, p_cursor->pos-1, &key );
262 gras_dynar_get(p_cursor->key_lens, p_cursor->pos_len-1, &key_len);
264 TRY(gras_dictelm_get_ext(p_cursor->head, key, key_len, data));