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e0edde6f | 1 | /* Copyright (c) 2009, 2010, 2011 Nicira, Inc. |
f85f8ebb BP |
2 | * |
3 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
4 | * you may not use this file except in compliance with the License. | |
5 | * You may obtain a copy of the License at: | |
6 | * | |
7 | * http://www.apache.org/licenses/LICENSE-2.0 | |
8 | * | |
9 | * Unless required by applicable law or agreed to in writing, software | |
10 | * distributed under the License is distributed on an "AS IS" BASIS, | |
11 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
12 | * See the License for the specific language governing permissions and | |
13 | * limitations under the License. | |
14 | */ | |
15 | ||
16 | #include <config.h> | |
17 | ||
18 | #include "condition.h" | |
19 | ||
20 | #include <limits.h> | |
21 | ||
22 | #include "column.h" | |
ee89ea7b | 23 | #include "openvswitch/json.h" |
f85f8ebb BP |
24 | #include "ovsdb-error.h" |
25 | #include "row.h" | |
ee89ea7b TW |
26 | |
27 | #include <string.h> | |
28 | ||
f85f8ebb | 29 | #include "table.h" |
ee89ea7b | 30 | #include "util.h" |
f85f8ebb BP |
31 | |
32 | struct ovsdb_error * | |
33 | ovsdb_function_from_string(const char *name, enum ovsdb_function *function) | |
34 | { | |
35 | #define OVSDB_FUNCTION(ENUM, NAME) \ | |
36 | if (!strcmp(name, NAME)) { \ | |
37 | *function = ENUM; \ | |
38 | return NULL; \ | |
39 | } | |
40 | OVSDB_FUNCTIONS; | |
41 | #undef OVSDB_FUNCTION | |
42 | ||
43 | return ovsdb_syntax_error(NULL, "unknown function", | |
44 | "No function named %s.", name); | |
45 | } | |
46 | ||
47 | const char * | |
48 | ovsdb_function_to_string(enum ovsdb_function function) | |
49 | { | |
50 | switch (function) { | |
51 | #define OVSDB_FUNCTION(ENUM, NAME) case ENUM: return NAME; | |
52 | OVSDB_FUNCTIONS; | |
53 | #undef OVSDB_FUNCTION | |
54 | } | |
55 | ||
56 | return NULL; | |
57 | } | |
58 | ||
ae9cab37 | 59 | static struct ovsdb_error * |
f85f8ebb BP |
60 | ovsdb_clause_from_json(const struct ovsdb_table_schema *ts, |
61 | const struct json *json, | |
fbf925e4 | 62 | struct ovsdb_symbol_table *symtab, |
f85f8ebb BP |
63 | struct ovsdb_clause *clause) |
64 | { | |
65 | const struct json_array *array; | |
66 | struct ovsdb_error *error; | |
67 | const char *function_name; | |
68 | const char *column_name; | |
69 | struct ovsdb_type type; | |
70 | ||
ae9cab37 LS |
71 | if (json->type == JSON_TRUE || json->type == JSON_FALSE) { |
72 | clause->function = | |
73 | json->type == JSON_TRUE ? OVSDB_F_TRUE : OVSDB_F_FALSE; | |
74 | ||
75 | /* Column and arg fields are not being used with boolean functions. | |
76 | * Use dummy values */ | |
77 | clause->column = ovsdb_table_schema_get_column(ts, "_uuid"); | |
78 | clause->index = clause->column->index; | |
79 | ovsdb_datum_init_default(&clause->arg, &clause->column->type); | |
80 | return NULL; | |
81 | } | |
82 | ||
f85f8ebb | 83 | if (json->type != JSON_ARRAY |
fa37affa BP |
84 | || json->array.n != 3 |
85 | || json->array.elems[0]->type != JSON_STRING | |
86 | || json->array.elems[1]->type != JSON_STRING) { | |
f85f8ebb BP |
87 | return ovsdb_syntax_error(json, NULL, "Parse error in condition."); |
88 | } | |
89 | array = json_array(json); | |
90 | ||
91 | column_name = json_string(array->elems[0]); | |
92 | clause->column = ovsdb_table_schema_get_column(ts, column_name); | |
93 | if (!clause->column) { | |
94 | return ovsdb_syntax_error(json, "unknown column", | |
95 | "No column %s in table %s.", | |
96 | column_name, ts->name); | |
97 | } | |
ae9cab37 | 98 | clause->index = clause->column->index; |
f85f8ebb BP |
99 | type = clause->column->type; |
100 | ||
101 | function_name = json_string(array->elems[1]); | |
102 | error = ovsdb_function_from_string(function_name, &clause->function); | |
103 | if (error) { | |
104 | return error; | |
105 | } | |
106 | ||
107 | /* Type-check and relax restrictions on 'type' if appropriate. */ | |
108 | switch (clause->function) { | |
109 | case OVSDB_F_LT: | |
110 | case OVSDB_F_LE: | |
111 | case OVSDB_F_GT: | |
112 | case OVSDB_F_GE: | |
09e25603 TW |
113 | /* Allow these operators for types with n_min == 0, n_max == 1. |
114 | * (They will always be "false" if the value is missing.) */ | |
115 | if (!(ovsdb_type_is_scalar(&type) | |
116 | || ovsdb_type_is_optional_scalar(&type)) | |
bd76d25d BP |
117 | || (type.key.type != OVSDB_TYPE_INTEGER |
118 | && type.key.type != OVSDB_TYPE_REAL)) { | |
f85f8ebb BP |
119 | char *s = ovsdb_type_to_english(&type); |
120 | error = ovsdb_syntax_error( | |
121 | json, NULL, "Type mismatch: \"%s\" operator may not be " | |
122 | "applied to column %s of type %s.", | |
123 | ovsdb_function_to_string(clause->function), | |
124 | clause->column->name, s); | |
125 | free(s); | |
126 | return error; | |
127 | } | |
64107d59 BP |
128 | |
129 | /* Force the argument to be a scalar. */ | |
130 | type.n_min = 1; | |
131 | ||
f85f8ebb | 132 | break; |
64107d59 | 133 | |
f85f8ebb BP |
134 | case OVSDB_F_EQ: |
135 | case OVSDB_F_NE: | |
136 | break; | |
137 | ||
138 | case OVSDB_F_EXCLUDES: | |
139 | if (!ovsdb_type_is_scalar(&type)) { | |
140 | type.n_min = 0; | |
141 | type.n_max = UINT_MAX; | |
142 | } | |
143 | break; | |
144 | ||
145 | case OVSDB_F_INCLUDES: | |
146 | if (!ovsdb_type_is_scalar(&type)) { | |
147 | type.n_min = 0; | |
148 | } | |
149 | break; | |
ae9cab37 LS |
150 | case OVSDB_F_TRUE: |
151 | case OVSDB_F_FALSE: | |
152 | OVS_NOT_REACHED(); | |
f85f8ebb BP |
153 | } |
154 | return ovsdb_datum_from_json(&clause->arg, &type, array->elems[2], symtab); | |
155 | } | |
156 | ||
157 | static void | |
158 | ovsdb_clause_free(struct ovsdb_clause *clause) | |
159 | { | |
160 | ovsdb_datum_destroy(&clause->arg, &clause->column->type); | |
161 | } | |
162 | ||
163 | static int | |
164 | compare_clauses_3way(const void *a_, const void *b_) | |
165 | { | |
166 | const struct ovsdb_clause *a = a_; | |
167 | const struct ovsdb_clause *b = b_; | |
168 | ||
169 | if (a->function != b->function) { | |
170 | /* Bring functions to the front based on the fraction of table rows | |
171 | * that they are (heuristically) expected to leave in the query | |
172 | * results. Note that "enum ovsdb_function" is intentionally ordered | |
173 | * to make this trivial. */ | |
174 | return a->function < b->function ? -1 : 1; | |
175 | } else if (a->column->index != b->column->index) { | |
176 | if (a->column->index < OVSDB_N_STD_COLUMNS | |
177 | || b->column->index < OVSDB_N_STD_COLUMNS) { | |
178 | /* Bring the standard columns and in particular the UUID column | |
179 | * (since OVSDB_COL_UUID has value 0) to the front. We have an | |
180 | * index on the UUID column, so that makes our queries cheaper. */ | |
181 | return a->column->index < b->column->index ? -1 : 1; | |
182 | } else { | |
183 | /* Order clauses predictably to make testing easier. */ | |
184 | return strcmp(a->column->name, b->column->name); | |
185 | } | |
186 | } else { | |
187 | return 0; | |
188 | } | |
189 | } | |
190 | ||
ae9cab37 LS |
191 | static int |
192 | compare_clauses_3way_with_data(const void *a_, const void *b_) | |
193 | { | |
194 | const struct ovsdb_clause *a = a_; | |
195 | const struct ovsdb_clause *b = b_; | |
196 | int res; | |
197 | ||
198 | res = compare_clauses_3way(a, b); | |
199 | return res ? res : ovsdb_datum_compare_3way(&a->arg, | |
200 | &b->arg, | |
201 | &a->column->type); | |
202 | } | |
203 | ||
f0d7ae19 LS |
204 | struct ovsdb_o_column { |
205 | const struct ovsdb_column *column; | |
206 | struct hmap o_clauses; | |
207 | }; | |
208 | ||
209 | struct ovsdb_o_clause { | |
210 | struct ovsdb_datum *arg; | |
211 | struct hmap_node hmap_node; | |
212 | }; | |
213 | ||
214 | static void | |
215 | ovsdb_condition_optimize(struct ovsdb_condition *cnd) | |
216 | { | |
217 | size_t i; | |
218 | uint32_t hash; | |
219 | ||
220 | if (!cnd->optimized) { | |
221 | return; | |
222 | } | |
223 | ||
224 | for(i = 0; i < cnd->n_clauses; i++) { | |
225 | struct ovsdb_clause *clause = &cnd->clauses[i]; | |
226 | ||
227 | if (clause->function != OVSDB_F_EQ) { | |
228 | continue; | |
229 | } | |
230 | ||
231 | struct ovsdb_o_clause *o_clause = xzalloc(sizeof *o_clause); | |
232 | struct ovsdb_o_column *o_column = | |
233 | shash_find_data(&cnd->o_columns, clause->column->name); | |
234 | ||
235 | if (!o_column) { | |
236 | o_column = xzalloc(sizeof *o_column); | |
237 | o_column->column = clause->column; | |
238 | hmap_init(&o_column->o_clauses); | |
239 | shash_add(&cnd->o_columns, clause->column->name, o_column); | |
240 | } | |
241 | o_clause->arg = &clause->arg; | |
242 | hash = ovsdb_datum_hash(&clause->arg, &clause->column->type, 0); | |
243 | hmap_insert(&o_column->o_clauses, &o_clause->hmap_node, hash); | |
244 | } | |
245 | } | |
246 | ||
247 | static void | |
248 | ovsdb_condition_optimize_destroy(struct ovsdb_condition *cnd) | |
249 | { | |
250 | struct shash_node *node, *next; | |
251 | ||
252 | SHASH_FOR_EACH_SAFE (node, next, &cnd->o_columns) { | |
253 | struct ovsdb_o_column *o_column = node->data; | |
254 | struct ovsdb_o_clause *c, *c_next; | |
255 | ||
256 | HMAP_FOR_EACH_SAFE(c, c_next, hmap_node, &o_column->o_clauses) { | |
257 | hmap_remove(&o_column->o_clauses, &c->hmap_node); | |
258 | free(c); | |
259 | } | |
260 | hmap_destroy(&o_column->o_clauses); | |
261 | shash_delete(&cnd->o_columns, node); | |
262 | free(o_column); | |
263 | } | |
264 | shash_destroy(&cnd->o_columns); | |
265 | } | |
266 | ||
f85f8ebb BP |
267 | struct ovsdb_error * |
268 | ovsdb_condition_from_json(const struct ovsdb_table_schema *ts, | |
269 | const struct json *json, | |
fbf925e4 | 270 | struct ovsdb_symbol_table *symtab, |
f85f8ebb BP |
271 | struct ovsdb_condition *cnd) |
272 | { | |
273 | const struct json_array *array = json_array(json); | |
274 | size_t i; | |
275 | ||
f0d7ae19 | 276 | ovsdb_condition_init(cnd); |
f85f8ebb | 277 | cnd->clauses = xmalloc(array->n * sizeof *cnd->clauses); |
f0d7ae19 | 278 | |
f85f8ebb BP |
279 | for (i = 0; i < array->n; i++) { |
280 | struct ovsdb_error *error; | |
281 | error = ovsdb_clause_from_json(ts, array->elems[i], symtab, | |
282 | &cnd->clauses[i]); | |
283 | if (error) { | |
284 | ovsdb_condition_destroy(cnd); | |
285 | cnd->clauses = NULL; | |
286 | cnd->n_clauses = 0; | |
287 | return error; | |
288 | } | |
289 | cnd->n_clauses++; | |
f0d7ae19 LS |
290 | if (cnd->clauses[i].function > OVSDB_F_EQ) { |
291 | cnd->optimized = false; | |
292 | } | |
f85f8ebb BP |
293 | } |
294 | ||
295 | /* A real database would have a query optimizer here. */ | |
296 | qsort(cnd->clauses, cnd->n_clauses, sizeof *cnd->clauses, | |
ae9cab37 | 297 | compare_clauses_3way_with_data); |
f85f8ebb | 298 | |
f0d7ae19 LS |
299 | ovsdb_condition_optimize(cnd); |
300 | ||
f85f8ebb BP |
301 | return NULL; |
302 | } | |
303 | ||
304 | static struct json * | |
305 | ovsdb_clause_to_json(const struct ovsdb_clause *clause) | |
306 | { | |
ae9cab37 LS |
307 | if (clause->function != OVSDB_F_TRUE && |
308 | clause->function != OVSDB_F_FALSE) { | |
309 | return json_array_create_3( | |
310 | json_string_create(clause->column->name), | |
311 | json_string_create(ovsdb_function_to_string(clause->function)), | |
312 | ovsdb_datum_to_json(&clause->arg, &clause->column->type)); | |
313 | } | |
314 | ||
315 | return json_boolean_create(clause->function == OVSDB_F_TRUE); | |
f85f8ebb BP |
316 | } |
317 | ||
318 | struct json * | |
319 | ovsdb_condition_to_json(const struct ovsdb_condition *cnd) | |
320 | { | |
321 | struct json **clauses; | |
322 | size_t i; | |
323 | ||
324 | clauses = xmalloc(cnd->n_clauses * sizeof *clauses); | |
325 | for (i = 0; i < cnd->n_clauses; i++) { | |
326 | clauses[i] = ovsdb_clause_to_json(&cnd->clauses[i]); | |
327 | } | |
328 | return json_array_create(clauses, cnd->n_clauses); | |
329 | } | |
330 | ||
40f280c7 | 331 | static bool |
ae9cab37 LS |
332 | ovsdb_clause_evaluate(const struct ovsdb_datum *fields, |
333 | const struct ovsdb_clause *c, | |
334 | unsigned int index_map[]) | |
40f280c7 | 335 | { |
ae9cab37 LS |
336 | const struct ovsdb_datum *field = &fields[index_map ? |
337 | index_map[c->column->index] : | |
338 | c->column->index]; | |
40f280c7 BP |
339 | const struct ovsdb_datum *arg = &c->arg; |
340 | const struct ovsdb_type *type = &c->column->type; | |
341 | ||
ae9cab37 LS |
342 | if (c->function == OVSDB_F_TRUE || |
343 | c->function == OVSDB_F_FALSE) { | |
344 | return c->function == OVSDB_F_TRUE; | |
345 | } | |
fcaba95e BP |
346 | if (ovsdb_type_is_optional_scalar(type) |
347 | && field->n == 0 | |
348 | && (c->function == OVSDB_F_LT || | |
349 | c->function == OVSDB_F_LE || | |
350 | c->function == OVSDB_F_GT || | |
351 | c->function == OVSDB_F_GE)) { | |
352 | return false; | |
353 | } else if ((ovsdb_type_is_scalar(type) | |
354 | || ovsdb_type_is_optional_scalar(type)) | |
355 | && field->n == 1 | |
356 | && arg->n == 1) { | |
40f280c7 BP |
357 | int cmp = ovsdb_atom_compare_3way(&field->keys[0], &arg->keys[0], |
358 | type->key.type); | |
359 | switch (c->function) { | |
360 | case OVSDB_F_LT: | |
361 | return cmp < 0; | |
362 | case OVSDB_F_LE: | |
363 | return cmp <= 0; | |
364 | case OVSDB_F_EQ: | |
365 | case OVSDB_F_INCLUDES: | |
366 | return cmp == 0; | |
367 | case OVSDB_F_NE: | |
368 | case OVSDB_F_EXCLUDES: | |
369 | return cmp != 0; | |
370 | case OVSDB_F_GE: | |
371 | return cmp >= 0; | |
372 | case OVSDB_F_GT: | |
373 | return cmp > 0; | |
ae9cab37 LS |
374 | case OVSDB_F_TRUE: |
375 | case OVSDB_F_FALSE: | |
376 | OVS_NOT_REACHED(); | |
40f280c7 BP |
377 | } |
378 | } else { | |
379 | switch (c->function) { | |
380 | case OVSDB_F_EQ: | |
381 | return ovsdb_datum_equals(field, arg, type); | |
382 | case OVSDB_F_NE: | |
383 | return !ovsdb_datum_equals(field, arg, type); | |
384 | case OVSDB_F_INCLUDES: | |
385 | return ovsdb_datum_includes_all(arg, field, type); | |
386 | case OVSDB_F_EXCLUDES: | |
387 | return ovsdb_datum_excludes_all(arg, field, type); | |
388 | case OVSDB_F_LT: | |
389 | case OVSDB_F_LE: | |
390 | case OVSDB_F_GE: | |
391 | case OVSDB_F_GT: | |
ae9cab37 LS |
392 | case OVSDB_F_TRUE: |
393 | case OVSDB_F_FALSE: | |
428b2edd | 394 | OVS_NOT_REACHED(); |
40f280c7 BP |
395 | } |
396 | } | |
397 | ||
428b2edd | 398 | OVS_NOT_REACHED(); |
40f280c7 BP |
399 | } |
400 | ||
ae9cab37 LS |
401 | static void |
402 | ovsdb_clause_clone(struct ovsdb_clause *new, struct ovsdb_clause *old) | |
403 | { | |
404 | new->function = old->function; | |
405 | new->column = old->column; | |
406 | ovsdb_datum_clone(&new->arg, | |
407 | &old->arg, | |
408 | &old->column->type); | |
409 | } | |
410 | ||
f85f8ebb | 411 | bool |
ae9cab37 LS |
412 | ovsdb_condition_match_every_clause(const struct ovsdb_row *row, |
413 | const struct ovsdb_condition *cnd) | |
f85f8ebb BP |
414 | { |
415 | size_t i; | |
416 | ||
417 | for (i = 0; i < cnd->n_clauses; i++) { | |
ae9cab37 | 418 | if (!ovsdb_clause_evaluate(row->fields, &cnd->clauses[i], NULL)) { |
40f280c7 | 419 | return false; |
f85f8ebb | 420 | } |
f85f8ebb BP |
421 | } |
422 | ||
423 | return true; | |
424 | } | |
425 | ||
f0d7ae19 LS |
426 | static bool |
427 | ovsdb_condition_match_any_clause_optimized(const struct ovsdb_datum *row_datum, | |
428 | const struct ovsdb_condition *cnd, | |
429 | unsigned int index_map[]) | |
430 | { | |
431 | if (ovsdb_condition_is_true(cnd)) { | |
432 | return true; | |
433 | } | |
434 | ||
435 | struct shash_node *node; | |
436 | SHASH_FOR_EACH (node, &cnd->o_columns) { | |
437 | struct ovsdb_o_column *o_column = node->data; | |
438 | const struct ovsdb_column *column = o_column->column; | |
439 | const struct ovsdb_datum *arg = &row_datum[index_map ? | |
440 | index_map[column->index] : | |
441 | column->index]; | |
442 | uint32_t hash = ovsdb_datum_hash(arg, &column->type, 0); | |
443 | struct ovsdb_o_clause *o_clause; | |
444 | ||
445 | HMAP_FOR_EACH_WITH_HASH(o_clause, hmap_node, hash, &o_column->o_clauses) { | |
446 | if (ovsdb_datum_equals(arg, o_clause->arg, &column->type)) { | |
447 | return true; | |
448 | } | |
449 | } | |
450 | } | |
451 | return false; | |
452 | } | |
453 | ||
ae9cab37 LS |
454 | /* Returns true if condition evaluation of one of the clauses is |
455 | * true. index_map[] is an optional array that if exists indicates a mapping | |
456 | * between indexing row_datum to the indexes in ovsdb_column */ | |
457 | bool | |
458 | ovsdb_condition_match_any_clause(const struct ovsdb_datum *row_datum, | |
459 | const struct ovsdb_condition *cnd, | |
460 | unsigned int index_map[]) | |
461 | { | |
462 | size_t i; | |
463 | ||
f0d7ae19 LS |
464 | if (cnd->optimized) { |
465 | return ovsdb_condition_match_any_clause_optimized(row_datum, cnd, | |
466 | index_map); | |
467 | } | |
468 | ||
ae9cab37 LS |
469 | for (i = 0; i < cnd->n_clauses; i++) { |
470 | if (ovsdb_clause_evaluate(row_datum, &cnd->clauses[i], index_map)) { | |
471 | return true; | |
472 | } | |
473 | } | |
474 | ||
475 | return false; | |
476 | } | |
477 | ||
f85f8ebb BP |
478 | void |
479 | ovsdb_condition_destroy(struct ovsdb_condition *cnd) | |
480 | { | |
481 | size_t i; | |
482 | ||
483 | for (i = 0; i < cnd->n_clauses; i++) { | |
484 | ovsdb_clause_free(&cnd->clauses[i]); | |
485 | } | |
486 | free(cnd->clauses); | |
ae9cab37 | 487 | cnd->n_clauses = 0; |
f0d7ae19 LS |
488 | |
489 | ovsdb_condition_optimize_destroy(cnd); | |
ae9cab37 LS |
490 | } |
491 | ||
492 | void | |
493 | ovsdb_condition_init(struct ovsdb_condition *cnd) | |
494 | { | |
495 | cnd->clauses = NULL; | |
496 | cnd->n_clauses = 0; | |
f0d7ae19 LS |
497 | cnd->optimized = true; |
498 | shash_init(&cnd->o_columns); | |
ae9cab37 LS |
499 | } |
500 | ||
501 | bool | |
502 | ovsdb_condition_empty(const struct ovsdb_condition *cnd) | |
503 | { | |
504 | return cnd->n_clauses == 0; | |
505 | } | |
506 | ||
507 | int | |
508 | ovsdb_condition_cmp_3way(const struct ovsdb_condition *a, | |
509 | const struct ovsdb_condition *b) | |
510 | { | |
511 | size_t i; | |
512 | int res; | |
513 | ||
514 | if (a->n_clauses != b->n_clauses) { | |
515 | return a->n_clauses < b->n_clauses ? -1 : 1; | |
516 | } | |
517 | ||
518 | /* We assume clauses are sorted */ | |
519 | for (i = 0; i < a->n_clauses; i++) { | |
520 | res = (compare_clauses_3way_with_data(&a->clauses[i], &b->clauses[i])); | |
521 | if (res != 0) { | |
522 | return res; | |
523 | } | |
524 | } | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
529 | void | |
530 | ovsdb_condition_clone(struct ovsdb_condition *to, | |
531 | const struct ovsdb_condition *from) | |
532 | { | |
533 | size_t i; | |
534 | ||
f0d7ae19 LS |
535 | ovsdb_condition_init(to); |
536 | ||
ae9cab37 LS |
537 | to->clauses = xzalloc(from->n_clauses * sizeof *to->clauses); |
538 | ||
539 | for (i = 0; i < from->n_clauses; i++) { | |
540 | ovsdb_clause_clone(&to->clauses[i], &from->clauses[i]); | |
541 | } | |
542 | to->n_clauses = from->n_clauses; | |
f0d7ae19 LS |
543 | to->optimized = from->optimized; |
544 | if (to->optimized) { | |
545 | ovsdb_condition_optimize(to); | |
546 | } | |
ae9cab37 LS |
547 | } |
548 | ||
549 | /* Return true if ovsdb_condition_match_any_clause() will return true on | |
550 | * any row */ | |
551 | bool | |
552 | ovsdb_condition_is_true(const struct ovsdb_condition *cond) | |
553 | { | |
554 | return (!cond->n_clauses || | |
555 | (cond->n_clauses >= 1 && (cond->clauses[0].function == OVSDB_F_TRUE)) || | |
556 | (cond->n_clauses >= 2 && (cond->clauses[1].function == OVSDB_F_TRUE))); | |
557 | } | |
558 | ||
559 | bool | |
560 | ovsdb_condition_is_false(const struct ovsdb_condition *cond) | |
561 | { | |
562 | return ((cond->n_clauses == 1) && | |
563 | (cond->clauses[0].function == OVSDB_F_FALSE)); | |
564 | } | |
565 | ||
566 | const struct ovsdb_column ** | |
567 | ovsdb_condition_get_columns(const struct ovsdb_condition *cond, | |
568 | size_t *n_columns) | |
569 | { | |
570 | const struct ovsdb_column **columns; | |
571 | size_t i; | |
572 | ||
573 | columns = xmalloc(cond->n_clauses * sizeof *columns); | |
574 | for (i = 0; i < cond->n_clauses; i++) { | |
575 | columns[i] = cond->clauses[i].column; | |
576 | } | |
577 | *n_columns = i; | |
578 | ||
579 | return columns; | |
f85f8ebb | 580 | } |