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c532bf9d | 1 | /* Copyright (c) 2009, 2010 Nicira Networks |
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 "ovsdb-data.h" | |
19 | ||
20 | #include <assert.h> | |
0194f33a BP |
21 | #include <ctype.h> |
22 | #include <float.h> | |
23 | #include <inttypes.h> | |
e9f8f936 | 24 | #include <limits.h> |
f85f8ebb | 25 | |
0194f33a | 26 | #include "dynamic-string.h" |
f85f8ebb BP |
27 | #include "hash.h" |
28 | #include "ovsdb-error.h" | |
29 | #include "json.h" | |
30 | #include "shash.h" | |
31 | #include "sort.h" | |
bd76d25d | 32 | #include "unicode.h" |
f85f8ebb BP |
33 | |
34 | static struct json * | |
35 | wrap_json(const char *name, struct json *wrapped) | |
36 | { | |
37 | return json_array_create_2(json_string_create(name), wrapped); | |
38 | } | |
39 | ||
5413de95 BP |
40 | /* Initializes 'atom' with the default value of the given 'type'. |
41 | * | |
42 | * The default value for an atom is as defined in ovsdb/SPECS: | |
43 | * | |
44 | * - "integer" or "real": 0 | |
45 | * | |
46 | * - "boolean": false | |
47 | * | |
48 | * - "string": "" (the empty string) | |
49 | * | |
50 | * - "uuid": 00000000-0000-0000-0000-000000000000 | |
51 | * | |
52 | * The caller must eventually arrange for 'atom' to be destroyed (with | |
53 | * ovsdb_atom_destroy()). */ | |
f85f8ebb BP |
54 | void |
55 | ovsdb_atom_init_default(union ovsdb_atom *atom, enum ovsdb_atomic_type type) | |
56 | { | |
57 | switch (type) { | |
58 | case OVSDB_TYPE_VOID: | |
59 | NOT_REACHED(); | |
60 | ||
61 | case OVSDB_TYPE_INTEGER: | |
62 | atom->integer = 0; | |
63 | break; | |
64 | ||
65 | case OVSDB_TYPE_REAL: | |
66 | atom->real = 0.0; | |
67 | break; | |
68 | ||
69 | case OVSDB_TYPE_BOOLEAN: | |
70 | atom->boolean = false; | |
71 | break; | |
72 | ||
73 | case OVSDB_TYPE_STRING: | |
74 | atom->string = xmemdup("", 1); | |
75 | break; | |
76 | ||
77 | case OVSDB_TYPE_UUID: | |
78 | uuid_zero(&atom->uuid); | |
79 | break; | |
80 | ||
81 | case OVSDB_N_TYPES: | |
82 | default: | |
83 | NOT_REACHED(); | |
84 | } | |
85 | } | |
86 | ||
5413de95 BP |
87 | |
88 | /* Returns true if 'atom', which must have the given 'type', has the default | |
89 | * value for that type. | |
90 | * | |
91 | * See ovsdb_atom_init_default() for an explanation of the default value of an | |
92 | * atom. */ | |
c532bf9d BP |
93 | bool |
94 | ovsdb_atom_is_default(const union ovsdb_atom *atom, | |
95 | enum ovsdb_atomic_type type) | |
96 | { | |
97 | switch (type) { | |
98 | case OVSDB_TYPE_VOID: | |
99 | NOT_REACHED(); | |
100 | ||
101 | case OVSDB_TYPE_INTEGER: | |
102 | return atom->integer == 0; | |
103 | ||
104 | case OVSDB_TYPE_REAL: | |
105 | return atom->real == 0.0; | |
106 | ||
107 | case OVSDB_TYPE_BOOLEAN: | |
108 | return atom->boolean == false; | |
109 | ||
110 | case OVSDB_TYPE_STRING: | |
111 | return atom->string[0] == '\0'; | |
112 | ||
113 | case OVSDB_TYPE_UUID: | |
114 | return uuid_is_zero(&atom->uuid); | |
115 | ||
116 | case OVSDB_N_TYPES: | |
117 | default: | |
118 | NOT_REACHED(); | |
119 | } | |
120 | } | |
121 | ||
5413de95 BP |
122 | /* Initializes 'new' as a copy of 'old', with the given 'type'. |
123 | * | |
124 | * The caller must eventually arrange for 'new' to be destroyed (with | |
125 | * ovsdb_atom_destroy()). */ | |
f85f8ebb BP |
126 | void |
127 | ovsdb_atom_clone(union ovsdb_atom *new, const union ovsdb_atom *old, | |
128 | enum ovsdb_atomic_type type) | |
129 | { | |
130 | switch (type) { | |
131 | case OVSDB_TYPE_VOID: | |
132 | NOT_REACHED(); | |
133 | ||
134 | case OVSDB_TYPE_INTEGER: | |
135 | new->integer = old->integer; | |
136 | break; | |
137 | ||
138 | case OVSDB_TYPE_REAL: | |
139 | new->real = old->real; | |
140 | break; | |
141 | ||
142 | case OVSDB_TYPE_BOOLEAN: | |
143 | new->boolean = old->boolean; | |
144 | break; | |
145 | ||
146 | case OVSDB_TYPE_STRING: | |
147 | new->string = xstrdup(old->string); | |
148 | break; | |
149 | ||
150 | case OVSDB_TYPE_UUID: | |
151 | new->uuid = old->uuid; | |
152 | break; | |
153 | ||
154 | case OVSDB_N_TYPES: | |
155 | default: | |
156 | NOT_REACHED(); | |
157 | } | |
158 | } | |
159 | ||
5413de95 | 160 | /* Swaps the contents of 'a' and 'b', which need not have the same type. */ |
f85f8ebb BP |
161 | void |
162 | ovsdb_atom_swap(union ovsdb_atom *a, union ovsdb_atom *b) | |
163 | { | |
164 | union ovsdb_atom tmp = *a; | |
165 | *a = *b; | |
166 | *b = tmp; | |
167 | } | |
168 | ||
5413de95 BP |
169 | /* Returns a hash value for 'atom', which has the specified 'type', folding |
170 | * 'basis' into the calculation. */ | |
f85f8ebb BP |
171 | uint32_t |
172 | ovsdb_atom_hash(const union ovsdb_atom *atom, enum ovsdb_atomic_type type, | |
173 | uint32_t basis) | |
174 | { | |
175 | switch (type) { | |
176 | case OVSDB_TYPE_VOID: | |
177 | NOT_REACHED(); | |
178 | ||
179 | case OVSDB_TYPE_INTEGER: | |
180 | return hash_int(atom->integer, basis); | |
181 | ||
182 | case OVSDB_TYPE_REAL: | |
183 | return hash_double(atom->real, basis); | |
184 | ||
185 | case OVSDB_TYPE_BOOLEAN: | |
186 | return hash_boolean(atom->boolean, basis); | |
187 | ||
188 | case OVSDB_TYPE_STRING: | |
189 | return hash_string(atom->string, basis); | |
190 | ||
191 | case OVSDB_TYPE_UUID: | |
192 | return hash_int(uuid_hash(&atom->uuid), basis); | |
193 | ||
194 | case OVSDB_N_TYPES: | |
195 | default: | |
196 | NOT_REACHED(); | |
197 | } | |
198 | } | |
199 | ||
5413de95 BP |
200 | /* Compares 'a' and 'b', which both have type 'type', and returns a |
201 | * strcmp()-like result. */ | |
f85f8ebb BP |
202 | int |
203 | ovsdb_atom_compare_3way(const union ovsdb_atom *a, | |
204 | const union ovsdb_atom *b, | |
205 | enum ovsdb_atomic_type type) | |
206 | { | |
207 | switch (type) { | |
208 | case OVSDB_TYPE_VOID: | |
209 | NOT_REACHED(); | |
210 | ||
211 | case OVSDB_TYPE_INTEGER: | |
212 | return a->integer < b->integer ? -1 : a->integer > b->integer; | |
213 | ||
214 | case OVSDB_TYPE_REAL: | |
215 | return a->real < b->real ? -1 : a->real > b->real; | |
216 | ||
217 | case OVSDB_TYPE_BOOLEAN: | |
218 | return a->boolean - b->boolean; | |
219 | ||
220 | case OVSDB_TYPE_STRING: | |
221 | return strcmp(a->string, b->string); | |
222 | ||
223 | case OVSDB_TYPE_UUID: | |
224 | return uuid_compare_3way(&a->uuid, &b->uuid); | |
225 | ||
226 | case OVSDB_N_TYPES: | |
227 | default: | |
228 | NOT_REACHED(); | |
229 | } | |
230 | } | |
231 | ||
232 | static struct ovsdb_error * | |
233 | unwrap_json(const struct json *json, const char *name, | |
234 | enum json_type value_type, const struct json **value) | |
235 | { | |
236 | if (json->type != JSON_ARRAY | |
237 | || json->u.array.n != 2 | |
238 | || json->u.array.elems[0]->type != JSON_STRING | |
239 | || (name && strcmp(json->u.array.elems[0]->u.string, name)) | |
240 | || json->u.array.elems[1]->type != value_type) | |
241 | { | |
242 | return ovsdb_syntax_error(json, NULL, "expected [\"%s\", <%s>]", name, | |
243 | json_type_to_string(value_type)); | |
244 | } | |
245 | *value = json->u.array.elems[1]; | |
246 | return NULL; | |
247 | } | |
248 | ||
249 | static struct ovsdb_error * | |
250 | parse_json_pair(const struct json *json, | |
251 | const struct json **elem0, const struct json **elem1) | |
252 | { | |
253 | if (json->type != JSON_ARRAY || json->u.array.n != 2) { | |
254 | return ovsdb_syntax_error(json, NULL, "expected 2-element array"); | |
255 | } | |
256 | *elem0 = json->u.array.elems[0]; | |
257 | *elem1 = json->u.array.elems[1]; | |
258 | return NULL; | |
259 | } | |
260 | ||
fbf925e4 | 261 | static struct ovsdb_error * WARN_UNUSED_RESULT |
f85f8ebb | 262 | ovsdb_atom_parse_uuid(struct uuid *uuid, const struct json *json, |
fbf925e4 | 263 | struct ovsdb_symbol_table *symtab) |
f85f8ebb BP |
264 | { |
265 | struct ovsdb_error *error0; | |
266 | const struct json *value; | |
267 | ||
268 | error0 = unwrap_json(json, "uuid", JSON_STRING, &value); | |
269 | if (!error0) { | |
270 | const char *uuid_string = json_string(value); | |
271 | if (!uuid_from_string(uuid, uuid_string)) { | |
272 | return ovsdb_syntax_error(json, NULL, "\"%s\" is not a valid UUID", | |
273 | uuid_string); | |
274 | } | |
275 | } else if (symtab) { | |
276 | struct ovsdb_error *error1; | |
277 | ||
278 | error1 = unwrap_json(json, "named-uuid", JSON_STRING, &value); | |
279 | if (!error1) { | |
280 | const char *name = json_string(value); | |
f85f8ebb BP |
281 | |
282 | ovsdb_error_destroy(error0); | |
fbf925e4 BP |
283 | *uuid = ovsdb_symbol_table_insert(symtab, name)->uuid; |
284 | return NULL; | |
f85f8ebb BP |
285 | } |
286 | ovsdb_error_destroy(error1); | |
287 | } | |
288 | ||
289 | return error0; | |
290 | } | |
291 | ||
bd76d25d BP |
292 | static struct ovsdb_error * WARN_UNUSED_RESULT |
293 | ovsdb_atom_from_json__(union ovsdb_atom *atom, enum ovsdb_atomic_type type, | |
294 | const struct json *json, | |
fbf925e4 | 295 | struct ovsdb_symbol_table *symtab) |
f85f8ebb BP |
296 | { |
297 | switch (type) { | |
298 | case OVSDB_TYPE_VOID: | |
299 | NOT_REACHED(); | |
300 | ||
301 | case OVSDB_TYPE_INTEGER: | |
302 | if (json->type == JSON_INTEGER) { | |
303 | atom->integer = json->u.integer; | |
304 | return NULL; | |
305 | } | |
306 | break; | |
307 | ||
308 | case OVSDB_TYPE_REAL: | |
309 | if (json->type == JSON_INTEGER) { | |
310 | atom->real = json->u.integer; | |
311 | return NULL; | |
312 | } else if (json->type == JSON_REAL) { | |
313 | atom->real = json->u.real; | |
314 | return NULL; | |
315 | } | |
316 | break; | |
317 | ||
318 | case OVSDB_TYPE_BOOLEAN: | |
319 | if (json->type == JSON_TRUE) { | |
320 | atom->boolean = true; | |
321 | return NULL; | |
322 | } else if (json->type == JSON_FALSE) { | |
323 | atom->boolean = false; | |
324 | return NULL; | |
325 | } | |
326 | break; | |
327 | ||
328 | case OVSDB_TYPE_STRING: | |
329 | if (json->type == JSON_STRING) { | |
330 | atom->string = xstrdup(json->u.string); | |
331 | return NULL; | |
332 | } | |
333 | break; | |
334 | ||
335 | case OVSDB_TYPE_UUID: | |
336 | return ovsdb_atom_parse_uuid(&atom->uuid, json, symtab); | |
337 | ||
338 | case OVSDB_N_TYPES: | |
339 | default: | |
340 | NOT_REACHED(); | |
341 | } | |
342 | ||
343 | return ovsdb_syntax_error(json, NULL, "expected %s", | |
344 | ovsdb_atomic_type_to_string(type)); | |
345 | } | |
346 | ||
5413de95 BP |
347 | /* Parses 'json' as an atom of the type described by 'base'. If successful, |
348 | * returns NULL and initializes 'atom' with the parsed atom. On failure, | |
349 | * returns an error and the contents of 'atom' are indeterminate. The caller | |
350 | * is responsible for freeing the error or the atom that is returned. | |
351 | * | |
352 | * If 'symtab' is nonnull, then named UUIDs in 'symtab' are accepted. Refer to | |
353 | * ovsdb/SPECS information about this and other syntactical details. */ | |
bd76d25d BP |
354 | struct ovsdb_error * |
355 | ovsdb_atom_from_json(union ovsdb_atom *atom, | |
356 | const struct ovsdb_base_type *base, | |
357 | const struct json *json, | |
fbf925e4 | 358 | struct ovsdb_symbol_table *symtab) |
bd76d25d BP |
359 | { |
360 | struct ovsdb_error *error; | |
361 | ||
362 | error = ovsdb_atom_from_json__(atom, base->type, json, symtab); | |
363 | if (error) { | |
364 | return error; | |
365 | } | |
366 | ||
367 | error = ovsdb_atom_check_constraints(atom, base); | |
368 | if (error) { | |
369 | ovsdb_atom_destroy(atom, base->type); | |
370 | } | |
371 | return error; | |
372 | } | |
373 | ||
5413de95 BP |
374 | /* Converts 'atom', of the specified 'type', to JSON format, and returns the |
375 | * JSON. The caller is responsible for freeing the returned JSON. */ | |
f85f8ebb BP |
376 | struct json * |
377 | ovsdb_atom_to_json(const union ovsdb_atom *atom, enum ovsdb_atomic_type type) | |
378 | { | |
379 | switch (type) { | |
380 | case OVSDB_TYPE_VOID: | |
381 | NOT_REACHED(); | |
382 | ||
383 | case OVSDB_TYPE_INTEGER: | |
384 | return json_integer_create(atom->integer); | |
385 | ||
386 | case OVSDB_TYPE_REAL: | |
387 | return json_real_create(atom->real); | |
388 | ||
389 | case OVSDB_TYPE_BOOLEAN: | |
390 | return json_boolean_create(atom->boolean); | |
391 | ||
392 | case OVSDB_TYPE_STRING: | |
393 | return json_string_create(atom->string); | |
394 | ||
395 | case OVSDB_TYPE_UUID: | |
396 | return wrap_json("uuid", json_string_create_nocopy( | |
397 | xasprintf(UUID_FMT, UUID_ARGS(&atom->uuid)))); | |
398 | ||
399 | case OVSDB_N_TYPES: | |
400 | default: | |
401 | NOT_REACHED(); | |
402 | } | |
403 | } | |
0194f33a | 404 | |
bd76d25d BP |
405 | static char * |
406 | ovsdb_atom_from_string__(union ovsdb_atom *atom, enum ovsdb_atomic_type type, | |
ce5a3e38 | 407 | const char *s, struct ovsdb_symbol_table *symtab) |
0194f33a BP |
408 | { |
409 | switch (type) { | |
410 | case OVSDB_TYPE_VOID: | |
411 | NOT_REACHED(); | |
412 | ||
413 | case OVSDB_TYPE_INTEGER: { | |
414 | long long int integer; | |
415 | if (!str_to_llong(s, 10, &integer)) { | |
1bc6ff29 | 416 | return xasprintf("\"%s\" is not a valid integer", s); |
0194f33a BP |
417 | } |
418 | atom->integer = integer; | |
419 | } | |
420 | break; | |
421 | ||
422 | case OVSDB_TYPE_REAL: | |
423 | if (!str_to_double(s, &atom->real)) { | |
1bc6ff29 | 424 | return xasprintf("\"%s\" is not a valid real number", s); |
0194f33a | 425 | } |
54a687fd BP |
426 | /* Our JSON input routines map negative zero to zero, so do that here |
427 | * too for consistency. */ | |
428 | if (atom->real == 0.0) { | |
429 | atom->real = 0.0; | |
430 | } | |
0194f33a BP |
431 | break; |
432 | ||
433 | case OVSDB_TYPE_BOOLEAN: | |
434 | if (!strcmp(s, "true") || !strcmp(s, "yes") || !strcmp(s, "on") | |
435 | || !strcmp(s, "1")) { | |
436 | atom->boolean = true; | |
437 | } else if (!strcmp(s, "false") || !strcmp(s, "no") || !strcmp(s, "off") | |
438 | || !strcmp(s, "0")) { | |
439 | atom->boolean = false; | |
440 | } else { | |
1bc6ff29 BP |
441 | return xasprintf("\"%s\" is not a valid boolean " |
442 | "(use \"true\" or \"false\")", s); | |
0194f33a BP |
443 | } |
444 | break; | |
445 | ||
446 | case OVSDB_TYPE_STRING: | |
447 | if (*s == '\0') { | |
1bc6ff29 BP |
448 | return xstrdup("An empty string is not valid as input; " |
449 | "use \"\" to represent the empty string"); | |
0194f33a BP |
450 | } else if (*s == '"') { |
451 | size_t s_len = strlen(s); | |
452 | ||
453 | if (s_len < 2 || s[s_len - 1] != '"') { | |
1bc6ff29 BP |
454 | return xasprintf("%s: missing quote at end of " |
455 | "quoted string", s); | |
0194f33a BP |
456 | } else if (!json_string_unescape(s + 1, s_len - 2, |
457 | &atom->string)) { | |
1bc6ff29 BP |
458 | char *error = xasprintf("%s: %s", s, atom->string); |
459 | free(atom->string); | |
460 | return error; | |
0194f33a BP |
461 | } |
462 | } else { | |
463 | atom->string = xstrdup(s); | |
464 | } | |
465 | break; | |
466 | ||
467 | case OVSDB_TYPE_UUID: | |
ce5a3e38 BP |
468 | if (*s == '@') { |
469 | atom->uuid = ovsdb_symbol_table_insert(symtab, s)->uuid; | |
470 | } else if (!uuid_from_string(&atom->uuid, s)) { | |
1bc6ff29 | 471 | return xasprintf("\"%s\" is not a valid UUID", s); |
0194f33a BP |
472 | } |
473 | break; | |
474 | ||
475 | case OVSDB_N_TYPES: | |
476 | default: | |
477 | NOT_REACHED(); | |
478 | } | |
1bc6ff29 BP |
479 | |
480 | return NULL; | |
0194f33a BP |
481 | } |
482 | ||
bd76d25d BP |
483 | /* Initializes 'atom' to a value of type 'base' parsed from 's', which takes |
484 | * one of the following forms: | |
485 | * | |
486 | * - OVSDB_TYPE_INTEGER: A decimal integer optionally preceded by a sign. | |
487 | * | |
488 | * - OVSDB_TYPE_REAL: A floating-point number in the format accepted by | |
489 | * strtod(). | |
490 | * | |
491 | * - OVSDB_TYPE_BOOLEAN: "true", "yes", "on", "1" for true, or "false", | |
492 | * "no", "off", or "0" for false. | |
493 | * | |
494 | * - OVSDB_TYPE_STRING: A JSON string if it begins with a quote, otherwise | |
495 | * an arbitrary string. | |
496 | * | |
ce5a3e38 BP |
497 | * - OVSDB_TYPE_UUID: A UUID in RFC 4122 format. If 'symtab' is nonnull, |
498 | * then an identifier beginning with '@' is also acceptable. If the | |
499 | * named identifier is already in 'symtab', then the associated UUID is | |
500 | * used; otherwise, a new, random UUID is used and added to the symbol | |
501 | * table. | |
bd76d25d BP |
502 | * |
503 | * Returns a null pointer if successful, otherwise an error message describing | |
5413de95 BP |
504 | * the problem. On failure, the contents of 'atom' are indeterminate. The |
505 | * caller is responsible for freeing the atom or the error. | |
bd76d25d BP |
506 | */ |
507 | char * | |
508 | ovsdb_atom_from_string(union ovsdb_atom *atom, | |
ce5a3e38 BP |
509 | const struct ovsdb_base_type *base, const char *s, |
510 | struct ovsdb_symbol_table *symtab) | |
bd76d25d BP |
511 | { |
512 | struct ovsdb_error *error; | |
513 | char *msg; | |
514 | ||
ce5a3e38 | 515 | msg = ovsdb_atom_from_string__(atom, base->type, s, symtab); |
bd76d25d BP |
516 | if (msg) { |
517 | return msg; | |
518 | } | |
519 | ||
520 | error = ovsdb_atom_check_constraints(atom, base); | |
521 | if (error) { | |
522 | msg = ovsdb_error_to_string(error); | |
523 | ovsdb_error_destroy(error); | |
524 | } | |
525 | return msg; | |
526 | } | |
527 | ||
0194f33a BP |
528 | static bool |
529 | string_needs_quotes(const char *s) | |
530 | { | |
531 | const char *p = s; | |
532 | unsigned char c; | |
533 | ||
534 | c = *p++; | |
535 | if (!isalpha(c) && c != '_') { | |
536 | return true; | |
537 | } | |
538 | ||
539 | while ((c = *p++) != '\0') { | |
540 | if (!isalpha(c) && c != '_' && c != '-' && c != '.') { | |
541 | return true; | |
542 | } | |
543 | } | |
544 | ||
545 | if (!strcmp(s, "true") || !strcmp(s, "false")) { | |
546 | return true; | |
547 | } | |
548 | ||
549 | return false; | |
550 | } | |
551 | ||
552 | /* Appends 'atom' (which has the given 'type') to 'out', in a format acceptable | |
553 | * to ovsdb_atom_from_string(). */ | |
554 | void | |
555 | ovsdb_atom_to_string(const union ovsdb_atom *atom, enum ovsdb_atomic_type type, | |
556 | struct ds *out) | |
557 | { | |
558 | switch (type) { | |
559 | case OVSDB_TYPE_VOID: | |
560 | NOT_REACHED(); | |
561 | ||
562 | case OVSDB_TYPE_INTEGER: | |
563 | ds_put_format(out, "%"PRId64, atom->integer); | |
564 | break; | |
565 | ||
566 | case OVSDB_TYPE_REAL: | |
567 | ds_put_format(out, "%.*g", DBL_DIG, atom->real); | |
568 | break; | |
569 | ||
570 | case OVSDB_TYPE_BOOLEAN: | |
571 | ds_put_cstr(out, atom->boolean ? "true" : "false"); | |
572 | break; | |
573 | ||
574 | case OVSDB_TYPE_STRING: | |
575 | if (string_needs_quotes(atom->string)) { | |
576 | struct json json; | |
577 | ||
578 | json.type = JSON_STRING; | |
579 | json.u.string = atom->string; | |
580 | json_to_ds(&json, 0, out); | |
581 | } else { | |
582 | ds_put_cstr(out, atom->string); | |
583 | } | |
584 | break; | |
585 | ||
586 | case OVSDB_TYPE_UUID: | |
587 | ds_put_format(out, UUID_FMT, UUID_ARGS(&atom->uuid)); | |
588 | break; | |
589 | ||
590 | case OVSDB_N_TYPES: | |
591 | default: | |
592 | NOT_REACHED(); | |
593 | } | |
594 | } | |
bd76d25d BP |
595 | |
596 | static struct ovsdb_error * | |
597 | check_string_constraints(const char *s, | |
598 | const struct ovsdb_string_constraints *c) | |
599 | { | |
600 | size_t n_chars; | |
601 | char *msg; | |
602 | ||
603 | msg = utf8_validate(s, &n_chars); | |
604 | if (msg) { | |
605 | struct ovsdb_error *error; | |
606 | ||
607 | error = ovsdb_error("constraint violation", | |
608 | "\"%s\" is not a valid UTF-8 string: %s", | |
609 | s, msg); | |
610 | free(msg); | |
611 | return error; | |
612 | } | |
613 | ||
614 | if (n_chars < c->minLen) { | |
615 | return ovsdb_error( | |
616 | "constraint violation", | |
617 | "\"%s\" length %zu is less than minimum allowed " | |
618 | "length %u", s, n_chars, c->minLen); | |
619 | } else if (n_chars > c->maxLen) { | |
620 | return ovsdb_error( | |
621 | "constraint violation", | |
622 | "\"%s\" length %zu is greater than maximum allowed " | |
623 | "length %u", s, n_chars, c->maxLen); | |
624 | } | |
625 | ||
bd76d25d BP |
626 | return NULL; |
627 | } | |
628 | ||
629 | /* Checks whether 'atom' meets the constraints (if any) defined in 'base'. | |
630 | * (base->type must specify 'atom''s type.) Returns a null pointer if the | |
0d0f05b9 BP |
631 | * constraints are met, otherwise an error that explains the violation. |
632 | * | |
633 | * Checking UUID constraints is deferred to transaction commit time, so this | |
634 | * function does nothing for UUID constraints. */ | |
bd76d25d BP |
635 | struct ovsdb_error * |
636 | ovsdb_atom_check_constraints(const union ovsdb_atom *atom, | |
637 | const struct ovsdb_base_type *base) | |
638 | { | |
bfc96d9b BP |
639 | if (base->enum_ |
640 | && ovsdb_datum_find_key(base->enum_, atom, base->type) == UINT_MAX) { | |
641 | struct ovsdb_error *error; | |
642 | struct ds actual = DS_EMPTY_INITIALIZER; | |
643 | struct ds valid = DS_EMPTY_INITIALIZER; | |
644 | ||
645 | ovsdb_atom_to_string(atom, base->type, &actual); | |
646 | ovsdb_datum_to_string(base->enum_, | |
647 | ovsdb_base_type_get_enum_type(base->type), | |
648 | &valid); | |
649 | error = ovsdb_error("constraint violation", | |
650 | "%s is not one of the allowed values (%s)", | |
651 | ds_cstr(&actual), ds_cstr(&valid)); | |
652 | ds_destroy(&actual); | |
653 | ds_destroy(&valid); | |
654 | ||
655 | return error; | |
656 | } | |
657 | ||
bd76d25d BP |
658 | switch (base->type) { |
659 | case OVSDB_TYPE_VOID: | |
660 | NOT_REACHED(); | |
661 | ||
662 | case OVSDB_TYPE_INTEGER: | |
663 | if (atom->integer >= base->u.integer.min | |
664 | && atom->integer <= base->u.integer.max) { | |
665 | return NULL; | |
666 | } else if (base->u.integer.min != INT64_MIN) { | |
667 | if (base->u.integer.max != INT64_MAX) { | |
668 | return ovsdb_error("constraint violation", | |
669 | "%"PRId64" is not in the valid range " | |
670 | "%"PRId64" to %"PRId64" (inclusive)", | |
671 | atom->integer, | |
672 | base->u.integer.min, base->u.integer.max); | |
673 | } else { | |
674 | return ovsdb_error("constraint violation", | |
675 | "%"PRId64" is less than minimum allowed " | |
676 | "value %"PRId64, | |
677 | atom->integer, base->u.integer.min); | |
678 | } | |
679 | } else { | |
680 | return ovsdb_error("constraint violation", | |
681 | "%"PRId64" is greater than maximum allowed " | |
682 | "value %"PRId64, | |
683 | atom->integer, base->u.integer.max); | |
684 | } | |
685 | NOT_REACHED(); | |
686 | ||
687 | case OVSDB_TYPE_REAL: | |
688 | if (atom->real >= base->u.real.min && atom->real <= base->u.real.max) { | |
689 | return NULL; | |
690 | } else if (base->u.real.min != -DBL_MAX) { | |
691 | if (base->u.real.max != DBL_MAX) { | |
692 | return ovsdb_error("constraint violation", | |
693 | "%.*g is not in the valid range " | |
694 | "%.*g to %.*g (inclusive)", | |
695 | DBL_DIG, atom->real, | |
696 | DBL_DIG, base->u.real.min, | |
697 | DBL_DIG, base->u.real.max); | |
698 | } else { | |
699 | return ovsdb_error("constraint violation", | |
700 | "%.*g is less than minimum allowed " | |
701 | "value %.*g", | |
702 | DBL_DIG, atom->real, | |
703 | DBL_DIG, base->u.real.min); | |
704 | } | |
705 | } else { | |
706 | return ovsdb_error("constraint violation", | |
707 | "%.*g is greater than maximum allowed " | |
708 | "value %.*g", | |
709 | DBL_DIG, atom->real, | |
710 | DBL_DIG, base->u.real.max); | |
711 | } | |
712 | NOT_REACHED(); | |
713 | ||
714 | case OVSDB_TYPE_BOOLEAN: | |
715 | return NULL; | |
716 | ||
717 | case OVSDB_TYPE_STRING: | |
718 | return check_string_constraints(atom->string, &base->u.string); | |
719 | ||
720 | case OVSDB_TYPE_UUID: | |
721 | return NULL; | |
722 | ||
723 | case OVSDB_N_TYPES: | |
724 | default: | |
725 | NOT_REACHED(); | |
726 | } | |
727 | } | |
f85f8ebb BP |
728 | \f |
729 | static union ovsdb_atom * | |
730 | alloc_default_atoms(enum ovsdb_atomic_type type, size_t n) | |
731 | { | |
732 | if (type != OVSDB_TYPE_VOID && n) { | |
733 | union ovsdb_atom *atoms; | |
734 | unsigned int i; | |
735 | ||
736 | atoms = xmalloc(n * sizeof *atoms); | |
737 | for (i = 0; i < n; i++) { | |
738 | ovsdb_atom_init_default(&atoms[i], type); | |
739 | } | |
740 | return atoms; | |
741 | } else { | |
742 | /* Avoid wasting memory in the n == 0 case, because xmalloc(0) is | |
743 | * treated as xmalloc(1). */ | |
744 | return NULL; | |
745 | } | |
746 | } | |
747 | ||
5413de95 BP |
748 | /* Initializes 'datum' as an empty datum. (An empty datum can be treated as |
749 | * any type.) */ | |
2f47998b BP |
750 | void |
751 | ovsdb_datum_init_empty(struct ovsdb_datum *datum) | |
752 | { | |
753 | datum->n = 0; | |
754 | datum->keys = NULL; | |
755 | datum->values = NULL; | |
756 | } | |
757 | ||
5413de95 BP |
758 | /* Initializes 'datum' as a datum that has the default value for 'type'. |
759 | * | |
760 | * The default value for a particular type is as defined in ovsdb/SPECS: | |
761 | * | |
762 | * - If n_min is 0, then the default value is the empty set (or map). | |
763 | * | |
764 | * - If n_min is 1, the default value is a single value or a single | |
765 | * key-value pair, whose key and value are the defaults for their | |
766 | * atomic types. (See ovsdb_atom_init_default() for details.) | |
767 | * | |
768 | * - n_min > 1 is invalid. See ovsdb_type_is_valid(). | |
769 | */ | |
f85f8ebb BP |
770 | void |
771 | ovsdb_datum_init_default(struct ovsdb_datum *datum, | |
772 | const struct ovsdb_type *type) | |
773 | { | |
774 | datum->n = type->n_min; | |
bd76d25d BP |
775 | datum->keys = alloc_default_atoms(type->key.type, datum->n); |
776 | datum->values = alloc_default_atoms(type->value.type, datum->n); | |
f85f8ebb BP |
777 | } |
778 | ||
5413de95 BP |
779 | /* Returns true if 'datum', which must have the given 'type', has the default |
780 | * value for that type. | |
781 | * | |
782 | * See ovsdb_datum_init_default() for an explanation of the default value of a | |
783 | * datum. */ | |
c532bf9d BP |
784 | bool |
785 | ovsdb_datum_is_default(const struct ovsdb_datum *datum, | |
786 | const struct ovsdb_type *type) | |
787 | { | |
788 | size_t i; | |
789 | ||
790 | if (datum->n != type->n_min) { | |
791 | return false; | |
792 | } | |
793 | for (i = 0; i < datum->n; i++) { | |
bd76d25d | 794 | if (!ovsdb_atom_is_default(&datum->keys[i], type->key.type)) { |
c532bf9d BP |
795 | return false; |
796 | } | |
bd76d25d BP |
797 | if (type->value.type != OVSDB_TYPE_VOID |
798 | && !ovsdb_atom_is_default(&datum->values[i], type->value.type)) { | |
c532bf9d BP |
799 | return false; |
800 | } | |
801 | } | |
802 | ||
803 | return true; | |
804 | } | |
805 | ||
f85f8ebb BP |
806 | static union ovsdb_atom * |
807 | clone_atoms(const union ovsdb_atom *old, enum ovsdb_atomic_type type, size_t n) | |
808 | { | |
809 | if (type != OVSDB_TYPE_VOID && n) { | |
810 | union ovsdb_atom *new; | |
811 | unsigned int i; | |
812 | ||
813 | new = xmalloc(n * sizeof *new); | |
814 | for (i = 0; i < n; i++) { | |
815 | ovsdb_atom_clone(&new[i], &old[i], type); | |
816 | } | |
817 | return new; | |
818 | } else { | |
819 | /* Avoid wasting memory in the n == 0 case, because xmalloc(0) is | |
820 | * treated as xmalloc(1). */ | |
821 | return NULL; | |
822 | } | |
823 | } | |
824 | ||
5413de95 BP |
825 | /* Initializes 'new' as a copy of 'old', with the given 'type'. |
826 | * | |
827 | * The caller must eventually arrange for 'new' to be destroyed (with | |
828 | * ovsdb_datum_destroy()). */ | |
f85f8ebb BP |
829 | void |
830 | ovsdb_datum_clone(struct ovsdb_datum *new, const struct ovsdb_datum *old, | |
831 | const struct ovsdb_type *type) | |
832 | { | |
833 | unsigned int n = old->n; | |
834 | new->n = n; | |
bd76d25d BP |
835 | new->keys = clone_atoms(old->keys, type->key.type, n); |
836 | new->values = clone_atoms(old->values, type->value.type, n); | |
f85f8ebb BP |
837 | } |
838 | ||
839 | static void | |
840 | free_data(enum ovsdb_atomic_type type, | |
841 | union ovsdb_atom *atoms, size_t n_atoms) | |
842 | { | |
843 | if (ovsdb_atom_needs_destruction(type)) { | |
844 | unsigned int i; | |
845 | for (i = 0; i < n_atoms; i++) { | |
846 | ovsdb_atom_destroy(&atoms[i], type); | |
847 | } | |
848 | } | |
849 | free(atoms); | |
850 | } | |
851 | ||
5413de95 BP |
852 | /* Frees the data owned by 'datum', which must have the given 'type'. |
853 | * | |
854 | * This does not actually call free(datum). If necessary, the caller must be | |
855 | * responsible for that. */ | |
f85f8ebb BP |
856 | void |
857 | ovsdb_datum_destroy(struct ovsdb_datum *datum, const struct ovsdb_type *type) | |
858 | { | |
bd76d25d BP |
859 | free_data(type->key.type, datum->keys, datum->n); |
860 | free_data(type->value.type, datum->values, datum->n); | |
f85f8ebb BP |
861 | } |
862 | ||
5413de95 | 863 | /* Swaps the contents of 'a' and 'b', which need not have the same type. */ |
f85f8ebb BP |
864 | void |
865 | ovsdb_datum_swap(struct ovsdb_datum *a, struct ovsdb_datum *b) | |
866 | { | |
867 | struct ovsdb_datum tmp = *a; | |
868 | *a = *b; | |
869 | *b = tmp; | |
870 | } | |
871 | ||
872 | struct ovsdb_datum_sort_cbdata { | |
bfc96d9b | 873 | enum ovsdb_atomic_type key_type; |
f85f8ebb BP |
874 | struct ovsdb_datum *datum; |
875 | }; | |
876 | ||
877 | static int | |
878 | ovsdb_datum_sort_compare_cb(size_t a, size_t b, void *cbdata_) | |
879 | { | |
880 | struct ovsdb_datum_sort_cbdata *cbdata = cbdata_; | |
881 | ||
882 | return ovsdb_atom_compare_3way(&cbdata->datum->keys[a], | |
883 | &cbdata->datum->keys[b], | |
bfc96d9b | 884 | cbdata->key_type); |
f85f8ebb BP |
885 | } |
886 | ||
887 | static void | |
888 | ovsdb_datum_sort_swap_cb(size_t a, size_t b, void *cbdata_) | |
889 | { | |
890 | struct ovsdb_datum_sort_cbdata *cbdata = cbdata_; | |
891 | ||
892 | ovsdb_atom_swap(&cbdata->datum->keys[a], &cbdata->datum->keys[b]); | |
bfc96d9b | 893 | if (cbdata->datum->values) { |
f85f8ebb BP |
894 | ovsdb_atom_swap(&cbdata->datum->values[a], &cbdata->datum->values[b]); |
895 | } | |
896 | } | |
897 | ||
5413de95 BP |
898 | /* The keys in an ovsdb_datum must be unique and in sorted order. Most |
899 | * functions that modify an ovsdb_datum maintain these invariants. For those | |
900 | * that don't, this function checks and restores these invariants for 'datum', | |
901 | * whose keys are of type 'key_type'. | |
902 | * | |
903 | * This function returns NULL if successful, otherwise an error message. The | |
904 | * caller must free the returned error when it is no longer needed. On error, | |
905 | * 'datum' is sorted but not unique. */ | |
e9f8f936 | 906 | struct ovsdb_error * |
bfc96d9b | 907 | ovsdb_datum_sort(struct ovsdb_datum *datum, enum ovsdb_atomic_type key_type) |
f85f8ebb BP |
908 | { |
909 | if (datum->n < 2) { | |
910 | return NULL; | |
911 | } else { | |
912 | struct ovsdb_datum_sort_cbdata cbdata; | |
913 | size_t i; | |
914 | ||
bfc96d9b | 915 | cbdata.key_type = key_type; |
f85f8ebb BP |
916 | cbdata.datum = datum; |
917 | sort(datum->n, ovsdb_datum_sort_compare_cb, ovsdb_datum_sort_swap_cb, | |
918 | &cbdata); | |
919 | ||
920 | for (i = 0; i < datum->n - 1; i++) { | |
921 | if (ovsdb_atom_equals(&datum->keys[i], &datum->keys[i + 1], | |
bfc96d9b BP |
922 | key_type)) { |
923 | if (datum->values) { | |
f85f8ebb BP |
924 | return ovsdb_error(NULL, "map contains duplicate key"); |
925 | } else { | |
926 | return ovsdb_error(NULL, "set contains duplicate"); | |
927 | } | |
928 | } | |
929 | } | |
930 | ||
931 | return NULL; | |
932 | } | |
933 | } | |
934 | ||
5413de95 BP |
935 | /* This function is the same as ovsdb_datum_sort(), except that the caller |
936 | * knows that 'datum' is unique. The operation therefore "cannot fail", so | |
937 | * this function assert-fails if it actually does. */ | |
bfc96d9b BP |
938 | void |
939 | ovsdb_datum_sort_assert(struct ovsdb_datum *datum, | |
940 | enum ovsdb_atomic_type key_type) | |
941 | { | |
942 | struct ovsdb_error *error = ovsdb_datum_sort(datum, key_type); | |
943 | if (error) { | |
944 | NOT_REACHED(); | |
945 | } | |
946 | } | |
947 | ||
bd76d25d BP |
948 | /* Checks that each of the atoms in 'datum' conforms to the constraints |
949 | * specified by its 'type'. Returns an error if a constraint is violated, | |
950 | * otherwise a null pointer. | |
951 | * | |
952 | * This function is not commonly useful because the most ordinary way to obtain | |
953 | * a datum is ultimately via ovsdb_atom_from_string() or | |
954 | * ovsdb_atom_from_json(), which check constraints themselves. */ | |
955 | struct ovsdb_error * | |
956 | ovsdb_datum_check_constraints(const struct ovsdb_datum *datum, | |
957 | const struct ovsdb_type *type) | |
958 | { | |
959 | struct ovsdb_error *error; | |
960 | unsigned int i; | |
961 | ||
962 | for (i = 0; i < datum->n; i++) { | |
963 | error = ovsdb_atom_check_constraints(&datum->keys[i], &type->key); | |
964 | if (error) { | |
965 | return error; | |
966 | } | |
967 | } | |
968 | ||
969 | if (type->value.type != OVSDB_TYPE_VOID) { | |
970 | for (i = 0; i < datum->n; i++) { | |
971 | error = ovsdb_atom_check_constraints(&datum->values[i], | |
972 | &type->value); | |
973 | if (error) { | |
974 | return error; | |
975 | } | |
976 | } | |
977 | } | |
978 | ||
979 | return NULL; | |
980 | } | |
981 | ||
f85f8ebb BP |
982 | struct ovsdb_error * |
983 | ovsdb_datum_from_json(struct ovsdb_datum *datum, | |
984 | const struct ovsdb_type *type, | |
985 | const struct json *json, | |
fbf925e4 | 986 | struct ovsdb_symbol_table *symtab) |
f85f8ebb BP |
987 | { |
988 | struct ovsdb_error *error; | |
989 | ||
ae8f13e2 BP |
990 | if (ovsdb_type_is_map(type) |
991 | || (json->type == JSON_ARRAY | |
992 | && json->u.array.n > 0 | |
993 | && json->u.array.elems[0]->type == JSON_STRING | |
994 | && !strcmp(json->u.array.elems[0]->u.string, "set"))) { | |
f85f8ebb BP |
995 | bool is_map = ovsdb_type_is_map(type); |
996 | const char *class = is_map ? "map" : "set"; | |
997 | const struct json *inner; | |
998 | unsigned int i; | |
999 | size_t n; | |
1000 | ||
f85f8ebb BP |
1001 | error = unwrap_json(json, class, JSON_ARRAY, &inner); |
1002 | if (error) { | |
1003 | return error; | |
1004 | } | |
1005 | ||
1006 | n = inner->u.array.n; | |
1007 | if (n < type->n_min || n > type->n_max) { | |
1008 | return ovsdb_syntax_error(json, NULL, "%s must have %u to " | |
1009 | "%u members but %zu are present", | |
1010 | class, type->n_min, type->n_max, n); | |
1011 | } | |
1012 | ||
1013 | datum->n = 0; | |
1014 | datum->keys = xmalloc(n * sizeof *datum->keys); | |
1015 | datum->values = is_map ? xmalloc(n * sizeof *datum->values) : NULL; | |
1016 | for (i = 0; i < n; i++) { | |
1017 | const struct json *element = inner->u.array.elems[i]; | |
1018 | const struct json *key = NULL; | |
1019 | const struct json *value = NULL; | |
1020 | ||
1021 | if (!is_map) { | |
1022 | key = element; | |
1023 | } else { | |
1024 | error = parse_json_pair(element, &key, &value); | |
1025 | if (error) { | |
1026 | goto error; | |
1027 | } | |
1028 | } | |
1029 | ||
bd76d25d | 1030 | error = ovsdb_atom_from_json(&datum->keys[i], &type->key, |
f85f8ebb BP |
1031 | key, symtab); |
1032 | if (error) { | |
1033 | goto error; | |
1034 | } | |
1035 | ||
1036 | if (is_map) { | |
1037 | error = ovsdb_atom_from_json(&datum->values[i], | |
bd76d25d | 1038 | &type->value, value, symtab); |
f85f8ebb | 1039 | if (error) { |
bd76d25d | 1040 | ovsdb_atom_destroy(&datum->keys[i], type->key.type); |
f85f8ebb BP |
1041 | goto error; |
1042 | } | |
1043 | } | |
1044 | ||
1045 | datum->n++; | |
1046 | } | |
1047 | ||
bfc96d9b | 1048 | error = ovsdb_datum_sort(datum, type->key.type); |
f85f8ebb BP |
1049 | if (error) { |
1050 | goto error; | |
1051 | } | |
1052 | ||
1053 | return NULL; | |
1054 | ||
1055 | error: | |
1056 | ovsdb_datum_destroy(datum, type); | |
1057 | return error; | |
ae8f13e2 BP |
1058 | } else { |
1059 | datum->n = 1; | |
1060 | datum->keys = xmalloc(sizeof *datum->keys); | |
1061 | datum->values = NULL; | |
1062 | ||
1063 | error = ovsdb_atom_from_json(&datum->keys[0], &type->key, | |
1064 | json, symtab); | |
1065 | if (error) { | |
1066 | free(datum->keys); | |
1067 | } | |
1068 | return error; | |
f85f8ebb BP |
1069 | } |
1070 | } | |
1071 | ||
1072 | struct json * | |
1073 | ovsdb_datum_to_json(const struct ovsdb_datum *datum, | |
1074 | const struct ovsdb_type *type) | |
1075 | { | |
1076 | /* These tests somewhat tolerate a 'datum' that does not exactly match | |
1077 | * 'type', in particular a datum with 'n' not in the allowed range. */ | |
ae8f13e2 | 1078 | if (datum->n == 1 && !ovsdb_type_is_map(type)) { |
bd76d25d BP |
1079 | return ovsdb_atom_to_json(&datum->keys[0], type->key.type); |
1080 | } else if (type->value.type == OVSDB_TYPE_VOID) { | |
f85f8ebb BP |
1081 | struct json **elems; |
1082 | size_t i; | |
1083 | ||
1084 | elems = xmalloc(datum->n * sizeof *elems); | |
1085 | for (i = 0; i < datum->n; i++) { | |
bd76d25d | 1086 | elems[i] = ovsdb_atom_to_json(&datum->keys[i], type->key.type); |
f85f8ebb BP |
1087 | } |
1088 | ||
1089 | return wrap_json("set", json_array_create(elems, datum->n)); | |
1090 | } else { | |
1091 | struct json **elems; | |
1092 | size_t i; | |
1093 | ||
1094 | elems = xmalloc(datum->n * sizeof *elems); | |
1095 | for (i = 0; i < datum->n; i++) { | |
1096 | elems[i] = json_array_create_2( | |
bd76d25d BP |
1097 | ovsdb_atom_to_json(&datum->keys[i], type->key.type), |
1098 | ovsdb_atom_to_json(&datum->values[i], type->value.type)); | |
f85f8ebb BP |
1099 | } |
1100 | ||
1101 | return wrap_json("map", json_array_create(elems, datum->n)); | |
1102 | } | |
1103 | } | |
1104 | ||
0194f33a BP |
1105 | static const char * |
1106 | skip_spaces(const char *p) | |
1107 | { | |
cb456217 BP |
1108 | while (isspace((unsigned char) *p)) { |
1109 | p++; | |
1110 | } | |
1111 | return p; | |
0194f33a BP |
1112 | } |
1113 | ||
1bc6ff29 | 1114 | static char * |
bd76d25d | 1115 | parse_atom_token(const char **s, const struct ovsdb_base_type *base, |
ce5a3e38 | 1116 | union ovsdb_atom *atom, struct ovsdb_symbol_table *symtab) |
0194f33a | 1117 | { |
1bc6ff29 | 1118 | char *token, *error; |
0194f33a | 1119 | |
1bc6ff29 BP |
1120 | error = ovsdb_token_parse(s, &token); |
1121 | if (!error) { | |
ce5a3e38 | 1122 | error = ovsdb_atom_from_string(atom, base, token, symtab); |
1bc6ff29 BP |
1123 | free(token); |
1124 | } | |
1125 | return error; | |
1126 | } | |
0194f33a | 1127 | |
1bc6ff29 BP |
1128 | static char * |
1129 | parse_key_value(const char **s, const struct ovsdb_type *type, | |
ce5a3e38 BP |
1130 | union ovsdb_atom *key, union ovsdb_atom *value, |
1131 | struct ovsdb_symbol_table *symtab) | |
1bc6ff29 BP |
1132 | { |
1133 | const char *start = *s; | |
1134 | char *error; | |
1135 | ||
ce5a3e38 | 1136 | error = parse_atom_token(s, &type->key, key, symtab); |
bd76d25d | 1137 | if (!error && type->value.type != OVSDB_TYPE_VOID) { |
9397a13f | 1138 | *s = skip_spaces(*s); |
1bc6ff29 BP |
1139 | if (**s == '=') { |
1140 | (*s)++; | |
9397a13f | 1141 | *s = skip_spaces(*s); |
ce5a3e38 | 1142 | error = parse_atom_token(s, &type->value, value, symtab); |
1bc6ff29 BP |
1143 | } else { |
1144 | error = xasprintf("%s: syntax error at \"%c\" expecting \"=\"", | |
1145 | start, **s); | |
1146 | } | |
1147 | if (error) { | |
bd76d25d | 1148 | ovsdb_atom_destroy(key, type->key.type); |
0194f33a | 1149 | } |
0194f33a | 1150 | } |
1bc6ff29 | 1151 | return error; |
0194f33a BP |
1152 | } |
1153 | ||
1154 | static void | |
1155 | free_key_value(const struct ovsdb_type *type, | |
1156 | union ovsdb_atom *key, union ovsdb_atom *value) | |
1157 | { | |
bd76d25d BP |
1158 | ovsdb_atom_destroy(key, type->key.type); |
1159 | if (type->value.type != OVSDB_TYPE_VOID) { | |
1160 | ovsdb_atom_destroy(value, type->value.type); | |
0194f33a BP |
1161 | } |
1162 | } | |
1163 | ||
1164 | /* Initializes 'datum' as a datum of the given 'type', parsing its contents | |
1165 | * from 's'. The format of 's' is a series of space or comma separated atoms | |
1166 | * or, for a map, '='-delimited pairs of atoms. Each atom must in a format | |
1167 | * acceptable to ovsdb_atom_from_string(). Optionally, a set may be enclosed | |
1168 | * in "[]" or a map in "{}"; for an empty set or map these punctuators are | |
ce5a3e38 BP |
1169 | * required. |
1170 | * | |
1171 | * Optionally, a symbol table may be supplied as 'symtab'. It is passed to | |
1172 | * ovsdb_atom_to_string(). */ | |
1bc6ff29 | 1173 | char * |
0194f33a | 1174 | ovsdb_datum_from_string(struct ovsdb_datum *datum, |
ce5a3e38 BP |
1175 | const struct ovsdb_type *type, const char *s, |
1176 | struct ovsdb_symbol_table *symtab) | |
0194f33a BP |
1177 | { |
1178 | bool is_map = ovsdb_type_is_map(type); | |
1bc6ff29 | 1179 | struct ovsdb_error *dberror; |
0194f33a BP |
1180 | const char *p; |
1181 | int end_delim; | |
1bc6ff29 | 1182 | char *error; |
0194f33a BP |
1183 | |
1184 | ovsdb_datum_init_empty(datum); | |
1185 | ||
1186 | /* Swallow a leading delimiter if there is one. */ | |
1187 | p = skip_spaces(s); | |
1188 | if (*p == (is_map ? '{' : '[')) { | |
1189 | end_delim = is_map ? '}' : ']'; | |
1190 | p = skip_spaces(p + 1); | |
1191 | } else if (!*p) { | |
1192 | if (is_map) { | |
1bc6ff29 | 1193 | return xstrdup("use \"{}\" to specify the empty map"); |
0194f33a | 1194 | } else { |
1bc6ff29 | 1195 | return xstrdup("use \"[]\" to specify the empty set"); |
0194f33a BP |
1196 | } |
1197 | } else { | |
1198 | end_delim = 0; | |
1199 | } | |
1200 | ||
1201 | while (*p && *p != end_delim) { | |
1202 | union ovsdb_atom key, value; | |
1203 | ||
1204 | if (ovsdb_token_is_delim(*p)) { | |
1bc6ff29 BP |
1205 | error = xasprintf("%s: unexpected \"%c\" parsing %s", |
1206 | s, *p, ovsdb_type_to_english(type)); | |
1207 | goto error; | |
0194f33a BP |
1208 | } |
1209 | ||
1210 | /* Add to datum. */ | |
ce5a3e38 | 1211 | error = parse_key_value(&p, type, &key, &value, symtab); |
1bc6ff29 BP |
1212 | if (error) { |
1213 | goto error; | |
1214 | } | |
0194f33a BP |
1215 | ovsdb_datum_add_unsafe(datum, &key, &value, type); |
1216 | free_key_value(type, &key, &value); | |
1217 | ||
1218 | /* Skip optional white space and comma. */ | |
1219 | p = skip_spaces(p); | |
1220 | if (*p == ',') { | |
1221 | p = skip_spaces(p + 1); | |
1222 | } | |
1223 | } | |
1224 | ||
1225 | if (*p != end_delim) { | |
1bc6ff29 BP |
1226 | error = xasprintf("%s: missing \"%c\" at end of data", s, end_delim); |
1227 | goto error; | |
0194f33a BP |
1228 | } |
1229 | if (end_delim) { | |
1230 | p = skip_spaces(p + 1); | |
1231 | if (*p) { | |
1bc6ff29 BP |
1232 | error = xasprintf("%s: trailing garbage after \"%c\"", |
1233 | s, end_delim); | |
1234 | goto error; | |
0194f33a BP |
1235 | } |
1236 | } | |
1237 | ||
1238 | if (datum->n < type->n_min) { | |
1bc6ff29 BP |
1239 | error = xasprintf("%s: %u %s specified but the minimum number is %u", |
1240 | s, datum->n, is_map ? "pair(s)" : "value(s)", | |
1241 | type->n_min); | |
1242 | goto error; | |
0194f33a | 1243 | } else if (datum->n > type->n_max) { |
1bc6ff29 BP |
1244 | error = xasprintf("%s: %u %s specified but the maximum number is %u", |
1245 | s, datum->n, is_map ? "pair(s)" : "value(s)", | |
1246 | type->n_max); | |
1247 | goto error; | |
0194f33a BP |
1248 | } |
1249 | ||
bfc96d9b | 1250 | dberror = ovsdb_datum_sort(datum, type->key.type); |
1bc6ff29 BP |
1251 | if (dberror) { |
1252 | ovsdb_error_destroy(dberror); | |
0194f33a | 1253 | if (ovsdb_type_is_map(type)) { |
1bc6ff29 | 1254 | error = xasprintf("%s: map contains duplicate key", s); |
0194f33a | 1255 | } else { |
1bc6ff29 | 1256 | error = xasprintf("%s: set contains duplicate value", s); |
0194f33a | 1257 | } |
1bc6ff29 | 1258 | goto error; |
0194f33a | 1259 | } |
1bc6ff29 BP |
1260 | |
1261 | return NULL; | |
1262 | ||
1263 | error: | |
1264 | ovsdb_datum_destroy(datum, type); | |
1265 | ovsdb_datum_init_empty(datum); | |
1266 | return error; | |
0194f33a BP |
1267 | } |
1268 | ||
1269 | /* Appends to 'out' the 'datum' (with the given 'type') in a format acceptable | |
1270 | * to ovsdb_datum_from_string(). */ | |
1271 | void | |
1272 | ovsdb_datum_to_string(const struct ovsdb_datum *datum, | |
1273 | const struct ovsdb_type *type, struct ds *out) | |
1274 | { | |
1275 | bool is_map = ovsdb_type_is_map(type); | |
1276 | size_t i; | |
1277 | ||
1278 | if (type->n_max > 1 || !datum->n) { | |
1279 | ds_put_char(out, is_map ? '{' : '['); | |
1280 | } | |
1281 | for (i = 0; i < datum->n; i++) { | |
1282 | if (i > 0) { | |
1283 | ds_put_cstr(out, ", "); | |
1284 | } | |
1285 | ||
bd76d25d | 1286 | ovsdb_atom_to_string(&datum->keys[i], type->key.type, out); |
0194f33a BP |
1287 | if (is_map) { |
1288 | ds_put_char(out, '='); | |
bd76d25d | 1289 | ovsdb_atom_to_string(&datum->values[i], type->value.type, out); |
0194f33a BP |
1290 | } |
1291 | } | |
1292 | if (type->n_max > 1 || !datum->n) { | |
1293 | ds_put_char(out, is_map ? '}' : ']'); | |
1294 | } | |
1295 | } | |
1296 | ||
f85f8ebb BP |
1297 | static uint32_t |
1298 | hash_atoms(enum ovsdb_atomic_type type, const union ovsdb_atom *atoms, | |
1299 | unsigned int n, uint32_t basis) | |
1300 | { | |
1301 | if (type != OVSDB_TYPE_VOID) { | |
1302 | unsigned int i; | |
1303 | ||
1304 | for (i = 0; i < n; i++) { | |
1305 | basis = ovsdb_atom_hash(&atoms[i], type, basis); | |
1306 | } | |
1307 | } | |
1308 | return basis; | |
1309 | } | |
1310 | ||
1311 | uint32_t | |
1312 | ovsdb_datum_hash(const struct ovsdb_datum *datum, | |
1313 | const struct ovsdb_type *type, uint32_t basis) | |
1314 | { | |
bd76d25d BP |
1315 | basis = hash_atoms(type->key.type, datum->keys, datum->n, basis); |
1316 | basis ^= (type->key.type << 24) | (type->value.type << 16) | datum->n; | |
1317 | basis = hash_atoms(type->value.type, datum->values, datum->n, basis); | |
f85f8ebb BP |
1318 | return basis; |
1319 | } | |
1320 | ||
1321 | static int | |
1322 | atom_arrays_compare_3way(const union ovsdb_atom *a, | |
2f47998b BP |
1323 | const union ovsdb_atom *b, |
1324 | enum ovsdb_atomic_type type, | |
1325 | size_t n) | |
f85f8ebb BP |
1326 | { |
1327 | unsigned int i; | |
1328 | ||
1329 | for (i = 0; i < n; i++) { | |
1330 | int cmp = ovsdb_atom_compare_3way(&a[i], &b[i], type); | |
1331 | if (cmp) { | |
1332 | return cmp; | |
1333 | } | |
1334 | } | |
1335 | ||
1336 | return 0; | |
1337 | } | |
1338 | ||
1339 | bool | |
1340 | ovsdb_datum_equals(const struct ovsdb_datum *a, | |
1341 | const struct ovsdb_datum *b, | |
1342 | const struct ovsdb_type *type) | |
1343 | { | |
1344 | return !ovsdb_datum_compare_3way(a, b, type); | |
1345 | } | |
1346 | ||
1347 | int | |
1348 | ovsdb_datum_compare_3way(const struct ovsdb_datum *a, | |
1349 | const struct ovsdb_datum *b, | |
1350 | const struct ovsdb_type *type) | |
1351 | { | |
1352 | int cmp; | |
1353 | ||
1354 | if (a->n != b->n) { | |
1355 | return a->n < b->n ? -1 : 1; | |
1356 | } | |
1357 | ||
bd76d25d | 1358 | cmp = atom_arrays_compare_3way(a->keys, b->keys, type->key.type, a->n); |
f85f8ebb BP |
1359 | if (cmp) { |
1360 | return cmp; | |
1361 | } | |
1362 | ||
bd76d25d BP |
1363 | return (type->value.type == OVSDB_TYPE_VOID ? 0 |
1364 | : atom_arrays_compare_3way(a->values, b->values, type->value.type, | |
f85f8ebb BP |
1365 | a->n)); |
1366 | } | |
1367 | ||
2f47998b | 1368 | /* If 'key' is one of the keys in 'datum', returns its index within 'datum', |
bd76d25d | 1369 | * otherwise UINT_MAX. 'key.type' must be the type of the atoms stored in the |
2f47998b BP |
1370 | * 'keys' array in 'datum'. |
1371 | */ | |
1372 | unsigned int | |
1373 | ovsdb_datum_find_key(const struct ovsdb_datum *datum, | |
1374 | const union ovsdb_atom *key, | |
1375 | enum ovsdb_atomic_type key_type) | |
1376 | { | |
1377 | unsigned int low = 0; | |
1378 | unsigned int high = datum->n; | |
1379 | while (low < high) { | |
1380 | unsigned int idx = (low + high) / 2; | |
1381 | int cmp = ovsdb_atom_compare_3way(key, &datum->keys[idx], key_type); | |
1382 | if (cmp < 0) { | |
1383 | high = idx; | |
1384 | } else if (cmp > 0) { | |
1385 | low = idx + 1; | |
1386 | } else { | |
1387 | return idx; | |
1388 | } | |
1389 | } | |
1390 | return UINT_MAX; | |
1391 | } | |
1392 | ||
1393 | /* If 'key' and 'value' is one of the key-value pairs in 'datum', returns its | |
bd76d25d | 1394 | * index within 'datum', otherwise UINT_MAX. 'key.type' must be the type of |
2f47998b BP |
1395 | * the atoms stored in the 'keys' array in 'datum'. 'value_type' may be the |
1396 | * type of the 'values' atoms or OVSDB_TYPE_VOID to compare only keys. | |
1397 | */ | |
1398 | unsigned int | |
1399 | ovsdb_datum_find_key_value(const struct ovsdb_datum *datum, | |
1400 | const union ovsdb_atom *key, | |
1401 | enum ovsdb_atomic_type key_type, | |
1402 | const union ovsdb_atom *value, | |
1403 | enum ovsdb_atomic_type value_type) | |
1404 | { | |
1405 | unsigned int idx = ovsdb_datum_find_key(datum, key, key_type); | |
1406 | if (idx != UINT_MAX | |
1407 | && value_type != OVSDB_TYPE_VOID | |
1408 | && !ovsdb_atom_equals(&datum->values[idx], value, value_type)) { | |
1409 | idx = UINT_MAX; | |
1410 | } | |
1411 | return idx; | |
1412 | } | |
1413 | ||
e9f8f936 BP |
1414 | /* If atom 'i' in 'a' is also in 'b', returns its index in 'b', otherwise |
1415 | * UINT_MAX. 'type' must be the type of 'a' and 'b', except that | |
bd76d25d | 1416 | * type->value.type may be set to OVSDB_TYPE_VOID to compare keys but not |
e9f8f936 BP |
1417 | * values. */ |
1418 | static unsigned int | |
1419 | ovsdb_datum_find(const struct ovsdb_datum *a, int i, | |
1420 | const struct ovsdb_datum *b, | |
1421 | const struct ovsdb_type *type) | |
f85f8ebb | 1422 | { |
2f47998b | 1423 | return ovsdb_datum_find_key_value(b, |
bd76d25d | 1424 | &a->keys[i], type->key.type, |
2f47998b | 1425 | a->values ? &a->values[i] : NULL, |
bd76d25d | 1426 | type->value.type); |
f85f8ebb BP |
1427 | } |
1428 | ||
1429 | /* Returns true if every element in 'a' is also in 'b', false otherwise. */ | |
1430 | bool | |
1431 | ovsdb_datum_includes_all(const struct ovsdb_datum *a, | |
1432 | const struct ovsdb_datum *b, | |
1433 | const struct ovsdb_type *type) | |
1434 | { | |
1435 | size_t i; | |
1436 | ||
1437 | for (i = 0; i < a->n; i++) { | |
e9f8f936 | 1438 | if (ovsdb_datum_find(a, i, b, type) == UINT_MAX) { |
f85f8ebb BP |
1439 | return false; |
1440 | } | |
1441 | } | |
1442 | return true; | |
1443 | } | |
1444 | ||
1445 | /* Returns true if no element in 'a' is also in 'b', false otherwise. */ | |
1446 | bool | |
1447 | ovsdb_datum_excludes_all(const struct ovsdb_datum *a, | |
1448 | const struct ovsdb_datum *b, | |
1449 | const struct ovsdb_type *type) | |
1450 | { | |
1451 | size_t i; | |
1452 | ||
1453 | for (i = 0; i < a->n; i++) { | |
e9f8f936 | 1454 | if (ovsdb_datum_find(a, i, b, type) != UINT_MAX) { |
f85f8ebb BP |
1455 | return false; |
1456 | } | |
1457 | } | |
1458 | return true; | |
1459 | } | |
e9f8f936 BP |
1460 | |
1461 | static void | |
1462 | ovsdb_datum_reallocate(struct ovsdb_datum *a, const struct ovsdb_type *type, | |
1463 | unsigned int capacity) | |
1464 | { | |
1465 | a->keys = xrealloc(a->keys, capacity * sizeof *a->keys); | |
bd76d25d | 1466 | if (type->value.type != OVSDB_TYPE_VOID) { |
e9f8f936 BP |
1467 | a->values = xrealloc(a->values, capacity * sizeof *a->values); |
1468 | } | |
1469 | } | |
1470 | ||
2f47998b BP |
1471 | /* Removes the element with index 'idx' from 'datum', which has type 'type'. |
1472 | * If 'idx' is not the last element in 'datum', then the removed element is | |
1473 | * replaced by the (former) last element. | |
1474 | * | |
1475 | * This function does not maintain ovsdb_datum invariants. Use | |
1476 | * ovsdb_datum_sort() to check and restore these invariants. */ | |
1477 | void | |
1478 | ovsdb_datum_remove_unsafe(struct ovsdb_datum *datum, size_t idx, | |
1479 | const struct ovsdb_type *type) | |
e9f8f936 | 1480 | { |
bd76d25d | 1481 | ovsdb_atom_destroy(&datum->keys[idx], type->key.type); |
2f47998b | 1482 | datum->keys[idx] = datum->keys[datum->n - 1]; |
bd76d25d BP |
1483 | if (type->value.type != OVSDB_TYPE_VOID) { |
1484 | ovsdb_atom_destroy(&datum->values[idx], type->value.type); | |
2f47998b BP |
1485 | datum->values[idx] = datum->values[datum->n - 1]; |
1486 | } | |
1487 | datum->n--; | |
1488 | } | |
1489 | ||
1490 | /* Adds the element with the given 'key' and 'value' to 'datum', which must | |
1491 | * have the specified 'type'. | |
1492 | * | |
1493 | * This function always allocates memory, so it is not an efficient way to add | |
1494 | * a number of elements to a datum. | |
1495 | * | |
1496 | * This function does not maintain ovsdb_datum invariants. Use | |
1497 | * ovsdb_datum_sort() to check and restore these invariants. (But a datum with | |
1498 | * 0 or 1 elements cannot violate the invariants anyhow.) */ | |
1499 | void | |
1500 | ovsdb_datum_add_unsafe(struct ovsdb_datum *datum, | |
1501 | const union ovsdb_atom *key, | |
1502 | const union ovsdb_atom *value, | |
1503 | const struct ovsdb_type *type) | |
1504 | { | |
1505 | size_t idx = datum->n++; | |
1506 | datum->keys = xrealloc(datum->keys, datum->n * sizeof *datum->keys); | |
bd76d25d BP |
1507 | ovsdb_atom_clone(&datum->keys[idx], key, type->key.type); |
1508 | if (type->value.type != OVSDB_TYPE_VOID) { | |
2f47998b BP |
1509 | datum->values = xrealloc(datum->values, |
1510 | datum->n * sizeof *datum->values); | |
bd76d25d | 1511 | ovsdb_atom_clone(&datum->values[idx], value, type->value.type); |
e9f8f936 | 1512 | } |
e9f8f936 BP |
1513 | } |
1514 | ||
1515 | void | |
2f47998b BP |
1516 | ovsdb_datum_union(struct ovsdb_datum *a, const struct ovsdb_datum *b, |
1517 | const struct ovsdb_type *type, bool replace) | |
e9f8f936 | 1518 | { |
e9f8f936 | 1519 | unsigned int n; |
2f47998b | 1520 | size_t bi; |
e9f8f936 | 1521 | |
e9f8f936 | 1522 | n = a->n; |
2f47998b BP |
1523 | for (bi = 0; bi < b->n; bi++) { |
1524 | unsigned int ai; | |
1525 | ||
bd76d25d | 1526 | ai = ovsdb_datum_find_key(a, &b->keys[bi], type->key.type); |
2f47998b | 1527 | if (ai == UINT_MAX) { |
e9f8f936 | 1528 | if (n == a->n) { |
2f47998b | 1529 | ovsdb_datum_reallocate(a, type, a->n + (b->n - bi)); |
e9f8f936 | 1530 | } |
bd76d25d BP |
1531 | ovsdb_atom_clone(&a->keys[n], &b->keys[bi], type->key.type); |
1532 | if (type->value.type != OVSDB_TYPE_VOID) { | |
2f47998b | 1533 | ovsdb_atom_clone(&a->values[n], &b->values[bi], |
bd76d25d | 1534 | type->value.type); |
e9f8f936 BP |
1535 | } |
1536 | n++; | |
bd76d25d BP |
1537 | } else if (replace && type->value.type != OVSDB_TYPE_VOID) { |
1538 | ovsdb_atom_destroy(&a->values[ai], type->value.type); | |
2f47998b | 1539 | ovsdb_atom_clone(&a->values[ai], &b->values[bi], |
bd76d25d | 1540 | type->value.type); |
e9f8f936 BP |
1541 | } |
1542 | } | |
1543 | if (n != a->n) { | |
1544 | struct ovsdb_error *error; | |
1545 | a->n = n; | |
bfc96d9b | 1546 | error = ovsdb_datum_sort(a, type->key.type); |
e9f8f936 BP |
1547 | assert(!error); |
1548 | } | |
1549 | } | |
1550 | ||
1551 | void | |
1552 | ovsdb_datum_subtract(struct ovsdb_datum *a, const struct ovsdb_type *a_type, | |
1553 | const struct ovsdb_datum *b, | |
1554 | const struct ovsdb_type *b_type) | |
1555 | { | |
1556 | bool changed = false; | |
1557 | size_t i; | |
1558 | ||
bd76d25d BP |
1559 | assert(a_type->key.type == b_type->key.type); |
1560 | assert(a_type->value.type == b_type->value.type | |
1561 | || b_type->value.type == OVSDB_TYPE_VOID); | |
e9f8f936 BP |
1562 | |
1563 | /* XXX The big-O of this could easily be improved. */ | |
1564 | for (i = 0; i < a->n; ) { | |
1565 | unsigned int idx = ovsdb_datum_find(a, i, b, b_type); | |
1566 | if (idx != UINT_MAX) { | |
1567 | changed = true; | |
2f47998b | 1568 | ovsdb_datum_remove_unsafe(a, i, a_type); |
e9f8f936 BP |
1569 | } else { |
1570 | i++; | |
1571 | } | |
1572 | } | |
1573 | if (changed) { | |
bfc96d9b | 1574 | ovsdb_datum_sort_assert(a, a_type->key.type); |
e9f8f936 BP |
1575 | } |
1576 | } | |
f85f8ebb BP |
1577 | \f |
1578 | struct ovsdb_symbol_table { | |
1579 | struct shash sh; | |
1580 | }; | |
1581 | ||
1582 | struct ovsdb_symbol_table * | |
1583 | ovsdb_symbol_table_create(void) | |
1584 | { | |
1585 | struct ovsdb_symbol_table *symtab = xmalloc(sizeof *symtab); | |
1586 | shash_init(&symtab->sh); | |
1587 | return symtab; | |
1588 | } | |
1589 | ||
1590 | void | |
1591 | ovsdb_symbol_table_destroy(struct ovsdb_symbol_table *symtab) | |
1592 | { | |
1593 | if (symtab) { | |
506051fc | 1594 | shash_destroy_free_data(&symtab->sh); |
f85f8ebb BP |
1595 | free(symtab); |
1596 | } | |
1597 | } | |
1598 | ||
2d2d6d4a | 1599 | struct ovsdb_symbol * |
f85f8ebb BP |
1600 | ovsdb_symbol_table_get(const struct ovsdb_symbol_table *symtab, |
1601 | const char *name) | |
1602 | { | |
1603 | return shash_find_data(&symtab->sh, name); | |
1604 | } | |
1605 | ||
fbf925e4 | 1606 | struct ovsdb_symbol * |
f85f8ebb | 1607 | ovsdb_symbol_table_put(struct ovsdb_symbol_table *symtab, const char *name, |
2d2d6d4a | 1608 | const struct uuid *uuid, bool used) |
f85f8ebb | 1609 | { |
2d2d6d4a BP |
1610 | struct ovsdb_symbol *symbol; |
1611 | ||
1612 | assert(!ovsdb_symbol_table_get(symtab, name)); | |
1613 | symbol = xmalloc(sizeof *symbol); | |
1614 | symbol->uuid = *uuid; | |
1615 | symbol->used = used; | |
1616 | shash_add(&symtab->sh, name, symbol); | |
fbf925e4 BP |
1617 | return symbol; |
1618 | } | |
1619 | ||
1620 | struct ovsdb_symbol * | |
1621 | ovsdb_symbol_table_insert(struct ovsdb_symbol_table *symtab, | |
1622 | const char *name) | |
1623 | { | |
1624 | struct ovsdb_symbol *symbol; | |
1625 | ||
1626 | symbol = ovsdb_symbol_table_get(symtab, name); | |
1627 | if (!symbol) { | |
1628 | struct uuid uuid; | |
1629 | ||
1630 | uuid_generate(&uuid); | |
1631 | symbol = ovsdb_symbol_table_put(symtab, name, &uuid, false); | |
1632 | } | |
1633 | return symbol; | |
f85f8ebb | 1634 | } |
ce5a3e38 BP |
1635 | |
1636 | const char * | |
1637 | ovsdb_symbol_table_find_unused(const struct ovsdb_symbol_table *symtab) | |
1638 | { | |
1639 | struct shash_node *node; | |
1640 | ||
1641 | SHASH_FOR_EACH (node, &symtab->sh) { | |
1642 | struct ovsdb_symbol *symbol = node->data; | |
1643 | if (!symbol->used) { | |
1644 | return node->name; | |
1645 | } | |
1646 | } | |
1647 | ||
1648 | return NULL; | |
1649 | } | |
0194f33a BP |
1650 | \f |
1651 | /* Extracts a token from the beginning of 's' and returns a pointer just after | |
1652 | * the token. Stores the token itself into '*outp', which the caller is | |
1653 | * responsible for freeing (with free()). | |
1654 | * | |
1655 | * If 's[0]' is a delimiter, the returned token is the empty string. | |
1656 | * | |
1657 | * A token extends from 's' to the first delimiter, as defined by | |
1658 | * ovsdb_token_is_delim(), or until the end of the string. A delimiter can be | |
1659 | * escaped with a backslash, in which case the backslash does not appear in the | |
1660 | * output. Double quotes also cause delimiters to be ignored, but the double | |
1661 | * quotes are retained in the output. (Backslashes inside double quotes are | |
1662 | * not removed, either.) | |
1663 | */ | |
1bc6ff29 BP |
1664 | char * |
1665 | ovsdb_token_parse(const char **s, char **outp) | |
0194f33a BP |
1666 | { |
1667 | const char *p; | |
1668 | struct ds out; | |
1669 | bool in_quotes; | |
1bc6ff29 | 1670 | char *error; |
0194f33a BP |
1671 | |
1672 | ds_init(&out); | |
1673 | in_quotes = false; | |
1bc6ff29 | 1674 | for (p = *s; *p != '\0'; ) { |
0194f33a BP |
1675 | int c = *p++; |
1676 | if (c == '\\') { | |
1677 | if (in_quotes) { | |
1678 | ds_put_char(&out, '\\'); | |
1679 | } | |
1680 | if (!*p) { | |
1bc6ff29 BP |
1681 | error = xasprintf("%s: backslash at end of argument", *s); |
1682 | goto error; | |
0194f33a BP |
1683 | } |
1684 | ds_put_char(&out, *p++); | |
1685 | } else if (!in_quotes && ovsdb_token_is_delim(c)) { | |
1686 | p--; | |
1687 | break; | |
1688 | } else { | |
1689 | ds_put_char(&out, c); | |
1690 | if (c == '"') { | |
1691 | in_quotes = !in_quotes; | |
1692 | } | |
1693 | } | |
1694 | } | |
1695 | if (in_quotes) { | |
1bc6ff29 BP |
1696 | error = xasprintf("%s: quoted string extends past end of argument", |
1697 | *s); | |
1698 | goto error; | |
0194f33a BP |
1699 | } |
1700 | *outp = ds_cstr(&out); | |
1bc6ff29 BP |
1701 | *s = p; |
1702 | return NULL; | |
1703 | ||
1704 | error: | |
1705 | ds_destroy(&out); | |
1706 | *outp = NULL; | |
1707 | return error; | |
0194f33a BP |
1708 | } |
1709 | ||
1710 | /* Returns true if 'c' delimits tokens, or if 'c' is 0, and false otherwise. */ | |
1711 | bool | |
1712 | ovsdb_token_is_delim(unsigned char c) | |
1713 | { | |
e89e5374 | 1714 | return strchr(":=, []{}!<>", c) != NULL; |
0194f33a | 1715 | } |