1 /***********************************************************
2 * Copyright 1987, 1998 The Open Group
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that
7 * copyright notice and this permission notice appear in supporting
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
17 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
18 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20 * Except as contained in this notice, the name of The Open Group shall not be
21 * used in advertising or otherwise to promote the sale, use or other dealings
22 * in this Software without prior written authorization from The Open Group.
25 * Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts.
29 * Permission to use, copy, modify, and distribute this software and its
30 * documentation for any purpose and without fee is hereby granted,
31 * provided that the above copyright notice appear in all copies and that
32 * both that copyright notice and this permission notice appear in
33 * supporting documentation, and that the name of Digital not be
34 * used in advertising or publicity pertaining to distribution of the
35 * software without specific, written prior permission.
37 * DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
38 * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
39 * DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
40 * ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
41 * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
42 * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
45 ******************************************************************/
47 /************************************************************
48 * Copyright 1994 by Silicon Graphics Computer Systems, Inc.
50 * Permission to use, copy, modify, and distribute this
51 * software and its documentation for any purpose and without
52 * fee is hereby granted, provided that the above copyright
53 * notice appear in all copies and that both that copyright
54 * notice and this permission notice appear in supporting
55 * documentation, and that the name of Silicon Graphics not be
56 * used in advertising or publicity pertaining to distribution
57 * of the software without specific prior written permission.
58 * Silicon Graphics makes no representation about the suitability
59 * of this software for any purpose. It is provided "as is"
60 * without any express or implied warranty.
62 * SILICON GRAPHICS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
63 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
64 * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
65 * GRAPHICS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
66 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
67 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
68 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH
69 * THE USE OR PERFORMANCE OF THIS SOFTWARE.
71 ********************************************************/
77 struct atom_node *left, *right;
79 unsigned int fingerprint;
84 struct atom_node *root;
85 darray(struct atom_node *) table;
91 struct atom_table *table;
93 table = calloc(1, sizeof(*table));
97 darray_init(table->table);
98 darray_growalloc(table->table, 100);
99 darray_append(table->table, NULL);
105 free_atom(struct atom_node *patom)
110 free_atom(patom->left);
111 free_atom(patom->right);
117 atom_table_free(struct atom_table *table)
122 free_atom(table->root);
123 darray_free(table->table);
128 atom_text(struct atom_table *table, xkb_atom_t atom)
130 if (atom >= darray_size(table->table) ||
131 darray_item(table->table, atom) == NULL)
134 return darray_item(table->table, atom)->string;
138 find_node_pointer(struct atom_table *table, const char *string, size_t len,
139 struct atom_node ***nodep_out, unsigned int *fingerprint_out)
141 struct atom_node **nodep;
142 unsigned int fingerprint = 0;
145 nodep = &table->root;
146 for (size_t i = 0; i < (len + 1) / 2; i++) {
147 fingerprint = fingerprint * 27 + string[i];
148 fingerprint = fingerprint * 27 + string[len - 1 - i];
152 if (fingerprint < (*nodep)->fingerprint) {
153 nodep = &((*nodep)->left);
155 else if (fingerprint > (*nodep)->fingerprint) {
156 nodep = &((*nodep)->right);
159 /* Now start testing the strings. */
160 const int cmp = strncmp(string, (*nodep)->string, len);
161 if (cmp < 0 || (cmp == 0 && len < strlen((*nodep)->string))) {
162 nodep = &((*nodep)->left);
165 nodep = &((*nodep)->right);
174 *fingerprint_out = fingerprint;
180 atom_lookup(struct atom_table *table, const char *string, size_t len)
182 struct atom_node **nodep;
183 unsigned int fingerprint;
186 return XKB_ATOM_NONE;
188 if (!find_node_pointer(table, string, len, &nodep, &fingerprint))
189 return XKB_ATOM_NONE;
191 return (*nodep)->atom;
195 * If steal is true, we do not strdup @string; therefore it must be
196 * dynamically allocated, NUL-terminated, not be free'd by the caller
197 * and not be used afterwards. Use to avoid some redundant allocations.
200 atom_intern(struct atom_table *table, const char *string, size_t len,
203 struct atom_node **nodep;
204 struct atom_node *node;
205 unsigned int fingerprint;
207 if (!string || len == 0)
208 return XKB_ATOM_NONE;
210 if (find_node_pointer(table, string, len, &nodep, &fingerprint)) {
212 free(UNCONSTIFY(string));
213 return (*nodep)->atom;
216 node = malloc(sizeof(*node));
218 return XKB_ATOM_NONE;
221 node->string = UNCONSTIFY(string);
224 node->string = strndup(string, len);
227 return XKB_ATOM_NONE;
232 node->left = node->right = NULL;
233 node->fingerprint = fingerprint;
234 node->atom = darray_size(table->table);
235 darray_append(table->table, node);