1 /* Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc.
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:
7 * http://www.apache.org/licenses/LICENSE-2.0
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.
18 #include "ovsdb-data.h"
26 #include "dynamic-string.h"
28 #include "ovsdb-error.h"
29 #include "ovsdb-parser.h"
37 wrap_json(const char *name, struct json *wrapped)
39 return json_array_create_2(json_string_create(name), wrapped);
42 /* Initializes 'atom' with the default value of the given 'type'.
44 * The default value for an atom is as defined in ovsdb/SPECS:
46 * - "integer" or "real": 0
50 * - "string": "" (the empty string)
52 * - "uuid": 00000000-0000-0000-0000-000000000000
54 * The caller must eventually arrange for 'atom' to be destroyed (with
55 * ovsdb_atom_destroy()). */
57 ovsdb_atom_init_default(union ovsdb_atom *atom, enum ovsdb_atomic_type type)
63 case OVSDB_TYPE_INTEGER:
71 case OVSDB_TYPE_BOOLEAN:
72 atom->boolean = false;
75 case OVSDB_TYPE_STRING:
76 atom->string = xmemdup("", 1);
80 uuid_zero(&atom->uuid);
89 /* Returns a read-only atom of the given 'type' that has the default value for
90 * 'type'. The caller must not modify or free the returned atom.
92 * See ovsdb_atom_init_default() for an explanation of the default value of an
94 const union ovsdb_atom *
95 ovsdb_atom_default(enum ovsdb_atomic_type type)
97 static union ovsdb_atom default_atoms[OVSDB_N_TYPES];
103 for (i = 0; i < OVSDB_N_TYPES; i++) {
104 if (i != OVSDB_TYPE_VOID) {
105 ovsdb_atom_init_default(&default_atoms[i], i);
111 assert(ovsdb_atomic_type_is_valid(type));
112 return &default_atoms[type];
115 /* Returns true if 'atom', which must have the given 'type', has the default
116 * value for that type.
118 * See ovsdb_atom_init_default() for an explanation of the default value of an
121 ovsdb_atom_is_default(const union ovsdb_atom *atom,
122 enum ovsdb_atomic_type type)
125 case OVSDB_TYPE_VOID:
128 case OVSDB_TYPE_INTEGER:
129 return atom->integer == 0;
131 case OVSDB_TYPE_REAL:
132 return atom->real == 0.0;
134 case OVSDB_TYPE_BOOLEAN:
135 return atom->boolean == false;
137 case OVSDB_TYPE_STRING:
138 return atom->string[0] == '\0';
140 case OVSDB_TYPE_UUID:
141 return uuid_is_zero(&atom->uuid);
149 /* Initializes 'new' as a copy of 'old', with the given 'type'.
151 * The caller must eventually arrange for 'new' to be destroyed (with
152 * ovsdb_atom_destroy()). */
154 ovsdb_atom_clone(union ovsdb_atom *new, const union ovsdb_atom *old,
155 enum ovsdb_atomic_type type)
158 case OVSDB_TYPE_VOID:
161 case OVSDB_TYPE_INTEGER:
162 new->integer = old->integer;
165 case OVSDB_TYPE_REAL:
166 new->real = old->real;
169 case OVSDB_TYPE_BOOLEAN:
170 new->boolean = old->boolean;
173 case OVSDB_TYPE_STRING:
174 new->string = xstrdup(old->string);
177 case OVSDB_TYPE_UUID:
178 new->uuid = old->uuid;
187 /* Swaps the contents of 'a' and 'b', which need not have the same type. */
189 ovsdb_atom_swap(union ovsdb_atom *a, union ovsdb_atom *b)
191 union ovsdb_atom tmp = *a;
196 /* Returns a hash value for 'atom', which has the specified 'type', folding
197 * 'basis' into the calculation. */
199 ovsdb_atom_hash(const union ovsdb_atom *atom, enum ovsdb_atomic_type type,
203 case OVSDB_TYPE_VOID:
206 case OVSDB_TYPE_INTEGER:
207 return hash_int(atom->integer, basis);
209 case OVSDB_TYPE_REAL:
210 return hash_double(atom->real, basis);
212 case OVSDB_TYPE_BOOLEAN:
213 return hash_boolean(atom->boolean, basis);
215 case OVSDB_TYPE_STRING:
216 return hash_string(atom->string, basis);
218 case OVSDB_TYPE_UUID:
219 return hash_int(uuid_hash(&atom->uuid), basis);
227 /* Compares 'a' and 'b', which both have type 'type', and returns a
228 * strcmp()-like result. */
230 ovsdb_atom_compare_3way(const union ovsdb_atom *a,
231 const union ovsdb_atom *b,
232 enum ovsdb_atomic_type type)
235 case OVSDB_TYPE_VOID:
238 case OVSDB_TYPE_INTEGER:
239 return a->integer < b->integer ? -1 : a->integer > b->integer;
241 case OVSDB_TYPE_REAL:
242 return a->real < b->real ? -1 : a->real > b->real;
244 case OVSDB_TYPE_BOOLEAN:
245 return a->boolean - b->boolean;
247 case OVSDB_TYPE_STRING:
248 return strcmp(a->string, b->string);
250 case OVSDB_TYPE_UUID:
251 return uuid_compare_3way(&a->uuid, &b->uuid);
259 static struct ovsdb_error *
260 unwrap_json(const struct json *json, const char *name,
261 enum json_type value_type, const struct json **value)
263 if (json->type != JSON_ARRAY
264 || json->u.array.n != 2
265 || json->u.array.elems[0]->type != JSON_STRING
266 || (name && strcmp(json->u.array.elems[0]->u.string, name))
267 || json->u.array.elems[1]->type != value_type)
270 return ovsdb_syntax_error(json, NULL, "expected [\"%s\", <%s>]", name,
271 json_type_to_string(value_type));
273 *value = json->u.array.elems[1];
277 static struct ovsdb_error *
278 parse_json_pair(const struct json *json,
279 const struct json **elem0, const struct json **elem1)
281 if (json->type != JSON_ARRAY || json->u.array.n != 2) {
282 return ovsdb_syntax_error(json, NULL, "expected 2-element array");
284 *elem0 = json->u.array.elems[0];
285 *elem1 = json->u.array.elems[1];
290 ovsdb_symbol_referenced(struct ovsdb_symbol *symbol,
291 const struct ovsdb_base_type *base)
293 assert(base->type == OVSDB_TYPE_UUID);
295 if (base->u.uuid.refTableName) {
296 switch (base->u.uuid.refType) {
297 case OVSDB_REF_STRONG:
298 symbol->strong_ref = true;
301 symbol->weak_ref = true;
307 static struct ovsdb_error * WARN_UNUSED_RESULT
308 ovsdb_atom_parse_uuid(struct uuid *uuid, const struct json *json,
309 struct ovsdb_symbol_table *symtab,
310 const struct ovsdb_base_type *base)
312 struct ovsdb_error *error0;
313 const struct json *value;
315 error0 = unwrap_json(json, "uuid", JSON_STRING, &value);
317 const char *uuid_string = json_string(value);
318 if (!uuid_from_string(uuid, uuid_string)) {
319 return ovsdb_syntax_error(json, NULL, "\"%s\" is not a valid UUID",
323 struct ovsdb_error *error1;
325 error1 = unwrap_json(json, "named-uuid", JSON_STRING, &value);
327 struct ovsdb_symbol *symbol;
329 ovsdb_error_destroy(error0);
330 if (!ovsdb_parser_is_id(json_string(value))) {
331 return ovsdb_syntax_error(json, NULL, "named-uuid string is "
335 symbol = ovsdb_symbol_table_insert(symtab, json_string(value));
336 *uuid = symbol->uuid;
337 ovsdb_symbol_referenced(symbol, base);
340 ovsdb_error_destroy(error1);
346 static struct ovsdb_error * WARN_UNUSED_RESULT
347 ovsdb_atom_from_json__(union ovsdb_atom *atom,
348 const struct ovsdb_base_type *base,
349 const struct json *json,
350 struct ovsdb_symbol_table *symtab)
352 enum ovsdb_atomic_type type = base->type;
355 case OVSDB_TYPE_VOID:
358 case OVSDB_TYPE_INTEGER:
359 if (json->type == JSON_INTEGER) {
360 atom->integer = json->u.integer;
365 case OVSDB_TYPE_REAL:
366 if (json->type == JSON_INTEGER) {
367 atom->real = json->u.integer;
369 } else if (json->type == JSON_REAL) {
370 atom->real = json->u.real;
375 case OVSDB_TYPE_BOOLEAN:
376 if (json->type == JSON_TRUE) {
377 atom->boolean = true;
379 } else if (json->type == JSON_FALSE) {
380 atom->boolean = false;
385 case OVSDB_TYPE_STRING:
386 if (json->type == JSON_STRING) {
387 atom->string = xstrdup(json->u.string);
392 case OVSDB_TYPE_UUID:
393 return ovsdb_atom_parse_uuid(&atom->uuid, json, symtab, base);
400 return ovsdb_syntax_error(json, NULL, "expected %s",
401 ovsdb_atomic_type_to_string(type));
404 /* Parses 'json' as an atom of the type described by 'base'. If successful,
405 * returns NULL and initializes 'atom' with the parsed atom. On failure,
406 * returns an error and the contents of 'atom' are indeterminate. The caller
407 * is responsible for freeing the error or the atom that is returned.
409 * Violations of constraints expressed by 'base' are treated as errors.
411 * If 'symtab' is nonnull, then named UUIDs in 'symtab' are accepted. Refer to
412 * ovsdb/SPECS for information about this, and for the syntax that this
413 * function accepts. If 'base' is a reference and a symbol is parsed, then the
414 * symbol's 'strong_ref' or 'weak_ref' member is set to true, as
417 ovsdb_atom_from_json(union ovsdb_atom *atom,
418 const struct ovsdb_base_type *base,
419 const struct json *json,
420 struct ovsdb_symbol_table *symtab)
422 struct ovsdb_error *error;
424 error = ovsdb_atom_from_json__(atom, base, json, symtab);
429 error = ovsdb_atom_check_constraints(atom, base);
431 ovsdb_atom_destroy(atom, base->type);
436 /* Converts 'atom', of the specified 'type', to JSON format, and returns the
437 * JSON. The caller is responsible for freeing the returned JSON.
439 * Refer to ovsdb/SPECS for the format of the JSON that this function
442 ovsdb_atom_to_json(const union ovsdb_atom *atom, enum ovsdb_atomic_type type)
445 case OVSDB_TYPE_VOID:
448 case OVSDB_TYPE_INTEGER:
449 return json_integer_create(atom->integer);
451 case OVSDB_TYPE_REAL:
452 return json_real_create(atom->real);
454 case OVSDB_TYPE_BOOLEAN:
455 return json_boolean_create(atom->boolean);
457 case OVSDB_TYPE_STRING:
458 return json_string_create(atom->string);
460 case OVSDB_TYPE_UUID:
461 return wrap_json("uuid", json_string_create_nocopy(
462 xasprintf(UUID_FMT, UUID_ARGS(&atom->uuid))));
471 ovsdb_atom_from_string__(union ovsdb_atom *atom,
472 const struct ovsdb_base_type *base, const char *s,
473 struct ovsdb_symbol_table *symtab)
475 enum ovsdb_atomic_type type = base->type;
478 case OVSDB_TYPE_VOID:
481 case OVSDB_TYPE_INTEGER: {
482 long long int integer;
483 if (!str_to_llong(s, 10, &integer)) {
484 return xasprintf("\"%s\" is not a valid integer", s);
486 atom->integer = integer;
490 case OVSDB_TYPE_REAL:
491 if (!str_to_double(s, &atom->real)) {
492 return xasprintf("\"%s\" is not a valid real number", s);
494 /* Our JSON input routines map negative zero to zero, so do that here
495 * too for consistency. */
496 if (atom->real == 0.0) {
501 case OVSDB_TYPE_BOOLEAN:
502 if (!strcmp(s, "true") || !strcmp(s, "yes") || !strcmp(s, "on")
503 || !strcmp(s, "1")) {
504 atom->boolean = true;
505 } else if (!strcmp(s, "false") || !strcmp(s, "no") || !strcmp(s, "off")
506 || !strcmp(s, "0")) {
507 atom->boolean = false;
509 return xasprintf("\"%s\" is not a valid boolean "
510 "(use \"true\" or \"false\")", s);
514 case OVSDB_TYPE_STRING:
516 return xstrdup("An empty string is not valid as input; "
517 "use \"\" to represent the empty string");
518 } else if (*s == '"') {
519 size_t s_len = strlen(s);
521 if (s_len < 2 || s[s_len - 1] != '"') {
522 return xasprintf("%s: missing quote at end of "
524 } else if (!json_string_unescape(s + 1, s_len - 2,
526 char *error = xasprintf("%s: %s", s, atom->string);
531 atom->string = xstrdup(s);
535 case OVSDB_TYPE_UUID:
537 struct ovsdb_symbol *symbol = ovsdb_symbol_table_insert(symtab, s);
538 atom->uuid = symbol->uuid;
539 ovsdb_symbol_referenced(symbol, base);
540 } else if (!uuid_from_string(&atom->uuid, s)) {
541 return xasprintf("\"%s\" is not a valid UUID", s);
553 /* Initializes 'atom' to a value of type 'base' parsed from 's', which takes
554 * one of the following forms:
556 * - OVSDB_TYPE_INTEGER: A decimal integer optionally preceded by a sign.
558 * - OVSDB_TYPE_REAL: A floating-point number in the format accepted by
561 * - OVSDB_TYPE_BOOLEAN: "true", "yes", "on", "1" for true, or "false",
562 * "no", "off", or "0" for false.
564 * - OVSDB_TYPE_STRING: A JSON string if it begins with a quote, otherwise
565 * an arbitrary string.
567 * - OVSDB_TYPE_UUID: A UUID in RFC 4122 format. If 'symtab' is nonnull,
568 * then an identifier beginning with '@' is also acceptable. If the
569 * named identifier is already in 'symtab', then the associated UUID is
570 * used; otherwise, a new, random UUID is used and added to the symbol
571 * table. If 'base' is a reference and a symbol is parsed, then the
572 * symbol's 'strong_ref' or 'weak_ref' member is set to true, as
575 * Returns a null pointer if successful, otherwise an error message describing
576 * the problem. On failure, the contents of 'atom' are indeterminate. The
577 * caller is responsible for freeing the atom or the error.
580 ovsdb_atom_from_string(union ovsdb_atom *atom,
581 const struct ovsdb_base_type *base, const char *s,
582 struct ovsdb_symbol_table *symtab)
584 struct ovsdb_error *error;
587 msg = ovsdb_atom_from_string__(atom, base, s, symtab);
592 error = ovsdb_atom_check_constraints(atom, base);
594 ovsdb_atom_destroy(atom, base->type);
595 msg = ovsdb_error_to_string(error);
596 ovsdb_error_destroy(error);
602 string_needs_quotes(const char *s)
608 if (!isalpha(c) && c != '_') {
612 while ((c = *p++) != '\0') {
613 if (!isalpha(c) && c != '_' && c != '-' && c != '.') {
618 if (!strcmp(s, "true") || !strcmp(s, "false")) {
625 /* Appends 'atom' (which has the given 'type') to 'out', in a format acceptable
626 * to ovsdb_atom_from_string(). */
628 ovsdb_atom_to_string(const union ovsdb_atom *atom, enum ovsdb_atomic_type type,
632 case OVSDB_TYPE_VOID:
635 case OVSDB_TYPE_INTEGER:
636 ds_put_format(out, "%"PRId64, atom->integer);
639 case OVSDB_TYPE_REAL:
640 ds_put_format(out, "%.*g", DBL_DIG, atom->real);
643 case OVSDB_TYPE_BOOLEAN:
644 ds_put_cstr(out, atom->boolean ? "true" : "false");
647 case OVSDB_TYPE_STRING:
648 if (string_needs_quotes(atom->string)) {
651 json.type = JSON_STRING;
652 json.u.string = atom->string;
653 json_to_ds(&json, 0, out);
655 ds_put_cstr(out, atom->string);
659 case OVSDB_TYPE_UUID:
660 ds_put_format(out, UUID_FMT, UUID_ARGS(&atom->uuid));
669 /* Appends 'atom' (which has the given 'type') to 'out', in a bare string
670 * format that cannot be parsed uniformly back into a datum but is easier for
671 * shell scripts, etc., to deal with. */
673 ovsdb_atom_to_bare(const union ovsdb_atom *atom, enum ovsdb_atomic_type type,
676 if (type == OVSDB_TYPE_STRING) {
677 ds_put_cstr(out, atom->string);
679 ovsdb_atom_to_string(atom, type, out);
683 static struct ovsdb_error *
684 check_string_constraints(const char *s,
685 const struct ovsdb_string_constraints *c)
690 msg = utf8_validate(s, &n_chars);
692 struct ovsdb_error *error;
694 error = ovsdb_error("constraint violation",
695 "not a valid UTF-8 string: %s", msg);
700 if (n_chars < c->minLen) {
702 "constraint violation",
703 "\"%s\" length %zu is less than minimum allowed "
704 "length %u", s, n_chars, c->minLen);
705 } else if (n_chars > c->maxLen) {
707 "constraint violation",
708 "\"%s\" length %zu is greater than maximum allowed "
709 "length %u", s, n_chars, c->maxLen);
715 /* Checks whether 'atom' meets the constraints (if any) defined in 'base'.
716 * (base->type must specify 'atom''s type.) Returns a null pointer if the
717 * constraints are met, otherwise an error that explains the violation.
719 * Checking UUID constraints is deferred to transaction commit time, so this
720 * function does nothing for UUID constraints. */
722 ovsdb_atom_check_constraints(const union ovsdb_atom *atom,
723 const struct ovsdb_base_type *base)
726 && ovsdb_datum_find_key(base->enum_, atom, base->type) == UINT_MAX) {
727 struct ovsdb_error *error;
728 struct ds actual = DS_EMPTY_INITIALIZER;
729 struct ds valid = DS_EMPTY_INITIALIZER;
731 ovsdb_atom_to_string(atom, base->type, &actual);
732 ovsdb_datum_to_string(base->enum_,
733 ovsdb_base_type_get_enum_type(base->type),
735 error = ovsdb_error("constraint violation",
736 "%s is not one of the allowed values (%s)",
737 ds_cstr(&actual), ds_cstr(&valid));
744 switch (base->type) {
745 case OVSDB_TYPE_VOID:
748 case OVSDB_TYPE_INTEGER:
749 if (atom->integer >= base->u.integer.min
750 && atom->integer <= base->u.integer.max) {
752 } else if (base->u.integer.min != INT64_MIN) {
753 if (base->u.integer.max != INT64_MAX) {
754 return ovsdb_error("constraint violation",
755 "%"PRId64" is not in the valid range "
756 "%"PRId64" to %"PRId64" (inclusive)",
758 base->u.integer.min, base->u.integer.max);
760 return ovsdb_error("constraint violation",
761 "%"PRId64" is less than minimum allowed "
763 atom->integer, base->u.integer.min);
766 return ovsdb_error("constraint violation",
767 "%"PRId64" is greater than maximum allowed "
769 atom->integer, base->u.integer.max);
773 case OVSDB_TYPE_REAL:
774 if (atom->real >= base->u.real.min && atom->real <= base->u.real.max) {
776 } else if (base->u.real.min != -DBL_MAX) {
777 if (base->u.real.max != DBL_MAX) {
778 return ovsdb_error("constraint violation",
779 "%.*g is not in the valid range "
780 "%.*g to %.*g (inclusive)",
782 DBL_DIG, base->u.real.min,
783 DBL_DIG, base->u.real.max);
785 return ovsdb_error("constraint violation",
786 "%.*g is less than minimum allowed "
789 DBL_DIG, base->u.real.min);
792 return ovsdb_error("constraint violation",
793 "%.*g is greater than maximum allowed "
796 DBL_DIG, base->u.real.max);
800 case OVSDB_TYPE_BOOLEAN:
803 case OVSDB_TYPE_STRING:
804 return check_string_constraints(atom->string, &base->u.string);
806 case OVSDB_TYPE_UUID:
815 static union ovsdb_atom *
816 alloc_default_atoms(enum ovsdb_atomic_type type, size_t n)
818 if (type != OVSDB_TYPE_VOID && n) {
819 union ovsdb_atom *atoms;
822 atoms = xmalloc(n * sizeof *atoms);
823 for (i = 0; i < n; i++) {
824 ovsdb_atom_init_default(&atoms[i], type);
828 /* Avoid wasting memory in the n == 0 case, because xmalloc(0) is
829 * treated as xmalloc(1). */
834 /* Initializes 'datum' as an empty datum. (An empty datum can be treated as
837 ovsdb_datum_init_empty(struct ovsdb_datum *datum)
841 datum->values = NULL;
844 /* Initializes 'datum' as a datum that has the default value for 'type'.
846 * The default value for a particular type is as defined in ovsdb/SPECS:
848 * - If n_min is 0, then the default value is the empty set (or map).
850 * - If n_min is 1, the default value is a single value or a single
851 * key-value pair, whose key and value are the defaults for their
852 * atomic types. (See ovsdb_atom_init_default() for details.)
854 * - n_min > 1 is invalid. See ovsdb_type_is_valid().
857 ovsdb_datum_init_default(struct ovsdb_datum *datum,
858 const struct ovsdb_type *type)
860 datum->n = type->n_min;
861 datum->keys = alloc_default_atoms(type->key.type, datum->n);
862 datum->values = alloc_default_atoms(type->value.type, datum->n);
865 /* Returns a read-only datum of the given 'type' that has the default value for
866 * 'type'. The caller must not modify or free the returned datum.
868 * See ovsdb_datum_init_default() for an explanation of the default value of a
870 const struct ovsdb_datum *
871 ovsdb_datum_default(const struct ovsdb_type *type)
873 if (type->n_min == 0) {
874 static const struct ovsdb_datum empty;
876 } else if (type->n_min == 1) {
877 static struct ovsdb_datum default_data[OVSDB_N_TYPES][OVSDB_N_TYPES];
878 struct ovsdb_datum *d;
879 int kt = type->key.type;
880 int vt = type->value.type;
882 assert(ovsdb_type_is_valid(type));
884 d = &default_data[kt][vt];
887 d->keys = (union ovsdb_atom *) ovsdb_atom_default(kt);
888 if (vt != OVSDB_TYPE_VOID) {
889 d->values = (union ovsdb_atom *) ovsdb_atom_default(vt);
898 /* Returns true if 'datum', which must have the given 'type', has the default
899 * value for that type.
901 * See ovsdb_datum_init_default() for an explanation of the default value of a
904 ovsdb_datum_is_default(const struct ovsdb_datum *datum,
905 const struct ovsdb_type *type)
909 if (datum->n != type->n_min) {
912 for (i = 0; i < datum->n; i++) {
913 if (!ovsdb_atom_is_default(&datum->keys[i], type->key.type)) {
916 if (type->value.type != OVSDB_TYPE_VOID
917 && !ovsdb_atom_is_default(&datum->values[i], type->value.type)) {
925 static union ovsdb_atom *
926 clone_atoms(const union ovsdb_atom *old, enum ovsdb_atomic_type type, size_t n)
928 if (type != OVSDB_TYPE_VOID && n) {
929 union ovsdb_atom *new;
932 new = xmalloc(n * sizeof *new);
933 for (i = 0; i < n; i++) {
934 ovsdb_atom_clone(&new[i], &old[i], type);
938 /* Avoid wasting memory in the n == 0 case, because xmalloc(0) is
939 * treated as xmalloc(1). */
944 /* Initializes 'new' as a copy of 'old', with the given 'type'.
946 * The caller must eventually arrange for 'new' to be destroyed (with
947 * ovsdb_datum_destroy()). */
949 ovsdb_datum_clone(struct ovsdb_datum *new, const struct ovsdb_datum *old,
950 const struct ovsdb_type *type)
952 unsigned int n = old->n;
954 new->keys = clone_atoms(old->keys, type->key.type, n);
955 new->values = clone_atoms(old->values, type->value.type, n);
959 free_data(enum ovsdb_atomic_type type,
960 union ovsdb_atom *atoms, size_t n_atoms)
962 if (ovsdb_atom_needs_destruction(type)) {
964 for (i = 0; i < n_atoms; i++) {
965 ovsdb_atom_destroy(&atoms[i], type);
971 /* Frees the data owned by 'datum', which must have the given 'type'.
973 * This does not actually call free(datum). If necessary, the caller must be
974 * responsible for that. */
976 ovsdb_datum_destroy(struct ovsdb_datum *datum, const struct ovsdb_type *type)
978 free_data(type->key.type, datum->keys, datum->n);
979 free_data(type->value.type, datum->values, datum->n);
982 /* Swaps the contents of 'a' and 'b', which need not have the same type. */
984 ovsdb_datum_swap(struct ovsdb_datum *a, struct ovsdb_datum *b)
986 struct ovsdb_datum tmp = *a;
991 struct ovsdb_datum_sort_cbdata {
992 enum ovsdb_atomic_type key_type;
993 enum ovsdb_atomic_type value_type;
994 struct ovsdb_datum *datum;
998 ovsdb_datum_sort_compare_cb(size_t a, size_t b, void *cbdata_)
1000 struct ovsdb_datum_sort_cbdata *cbdata = cbdata_;
1003 retval = ovsdb_atom_compare_3way(&cbdata->datum->keys[a],
1004 &cbdata->datum->keys[b],
1006 if (retval || cbdata->value_type == OVSDB_TYPE_VOID) {
1010 return ovsdb_atom_compare_3way(&cbdata->datum->values[a],
1011 &cbdata->datum->values[b],
1012 cbdata->value_type);
1016 ovsdb_datum_sort_swap_cb(size_t a, size_t b, void *cbdata_)
1018 struct ovsdb_datum_sort_cbdata *cbdata = cbdata_;
1020 ovsdb_atom_swap(&cbdata->datum->keys[a], &cbdata->datum->keys[b]);
1021 if (cbdata->datum->values) {
1022 ovsdb_atom_swap(&cbdata->datum->values[a], &cbdata->datum->values[b]);
1027 ovsdb_datum_sort__(struct ovsdb_datum *datum, enum ovsdb_atomic_type key_type,
1028 enum ovsdb_atomic_type value_type)
1030 struct ovsdb_datum_sort_cbdata cbdata;
1032 cbdata.key_type = key_type;
1033 cbdata.value_type = value_type;
1034 cbdata.datum = datum;
1035 sort(datum->n, ovsdb_datum_sort_compare_cb, ovsdb_datum_sort_swap_cb,
1039 /* The keys in an ovsdb_datum must be unique and in sorted order. Most
1040 * functions that modify an ovsdb_datum maintain these invariants. For those
1041 * that don't, this function checks and restores these invariants for 'datum',
1042 * whose keys are of type 'key_type'.
1044 * This function returns NULL if successful, otherwise an error message. The
1045 * caller must free the returned error when it is no longer needed. On error,
1046 * 'datum' is sorted but not unique. */
1047 struct ovsdb_error *
1048 ovsdb_datum_sort(struct ovsdb_datum *datum, enum ovsdb_atomic_type key_type)
1056 ovsdb_datum_sort__(datum, key_type, OVSDB_TYPE_VOID);
1058 for (i = 0; i < datum->n - 1; i++) {
1059 if (ovsdb_atom_equals(&datum->keys[i], &datum->keys[i + 1],
1061 if (datum->values) {
1062 return ovsdb_error(NULL, "map contains duplicate key");
1064 return ovsdb_error(NULL, "set contains duplicate");
1071 /* This function is the same as ovsdb_datum_sort(), except that the caller
1072 * knows that 'datum' is unique. The operation therefore "cannot fail", so
1073 * this function assert-fails if it actually does. */
1075 ovsdb_datum_sort_assert(struct ovsdb_datum *datum,
1076 enum ovsdb_atomic_type key_type)
1078 struct ovsdb_error *error = ovsdb_datum_sort(datum, key_type);
1084 /* This is similar to ovsdb_datum_sort(), except that it drops duplicate keys
1085 * instead of reporting an error. In a map type, the smallest value among a
1086 * group of duplicate pairs is retained and the others are dropped.
1088 * Returns the number of keys (or pairs) that were dropped. */
1090 ovsdb_datum_sort_unique(struct ovsdb_datum *datum,
1091 enum ovsdb_atomic_type key_type,
1092 enum ovsdb_atomic_type value_type)
1100 ovsdb_datum_sort__(datum, key_type, value_type);
1103 for (src = 1; src < datum->n; src++) {
1104 if (ovsdb_atom_equals(&datum->keys[src], &datum->keys[dst - 1],
1106 ovsdb_atom_destroy(&datum->keys[src], key_type);
1107 if (value_type != OVSDB_TYPE_VOID) {
1108 ovsdb_atom_destroy(&datum->values[src], value_type);
1112 datum->keys[dst] = datum->keys[src];
1113 if (value_type != OVSDB_TYPE_VOID) {
1114 datum->values[dst] = datum->values[src];
1121 return datum->n - src;
1124 /* Checks that each of the atoms in 'datum' conforms to the constraints
1125 * specified by its 'type'. Returns an error if a constraint is violated,
1126 * otherwise a null pointer.
1128 * This function is not commonly useful because the most ordinary way to obtain
1129 * a datum is ultimately via ovsdb_atom_from_string() or
1130 * ovsdb_atom_from_json(), which check constraints themselves. */
1131 struct ovsdb_error *
1132 ovsdb_datum_check_constraints(const struct ovsdb_datum *datum,
1133 const struct ovsdb_type *type)
1135 struct ovsdb_error *error;
1138 for (i = 0; i < datum->n; i++) {
1139 error = ovsdb_atom_check_constraints(&datum->keys[i], &type->key);
1145 if (type->value.type != OVSDB_TYPE_VOID) {
1146 for (i = 0; i < datum->n; i++) {
1147 error = ovsdb_atom_check_constraints(&datum->values[i],
1158 static struct ovsdb_error *
1159 ovsdb_datum_from_json__(struct ovsdb_datum *datum,
1160 const struct ovsdb_type *type,
1161 const struct json *json,
1162 struct ovsdb_symbol_table *symtab)
1164 struct ovsdb_error *error;
1166 if (ovsdb_type_is_map(type)
1167 || (json->type == JSON_ARRAY
1168 && json->u.array.n > 0
1169 && json->u.array.elems[0]->type == JSON_STRING
1170 && !strcmp(json->u.array.elems[0]->u.string, "set"))) {
1171 bool is_map = ovsdb_type_is_map(type);
1172 const char *class = is_map ? "map" : "set";
1173 const struct json *inner;
1177 error = unwrap_json(json, class, JSON_ARRAY, &inner);
1182 n = inner->u.array.n;
1183 if (n < type->n_min || n > type->n_max) {
1184 return ovsdb_syntax_error(json, NULL, "%s must have %u to "
1185 "%u members but %zu are present",
1186 class, type->n_min, type->n_max, n);
1190 datum->keys = xmalloc(n * sizeof *datum->keys);
1191 datum->values = is_map ? xmalloc(n * sizeof *datum->values) : NULL;
1192 for (i = 0; i < n; i++) {
1193 const struct json *element = inner->u.array.elems[i];
1194 const struct json *key = NULL;
1195 const struct json *value = NULL;
1200 error = parse_json_pair(element, &key, &value);
1206 error = ovsdb_atom_from_json(&datum->keys[i], &type->key,
1213 error = ovsdb_atom_from_json(&datum->values[i],
1214 &type->value, value, symtab);
1216 ovsdb_atom_destroy(&datum->keys[i], type->key.type);
1226 ovsdb_datum_destroy(datum, type);
1230 datum->keys = xmalloc(sizeof *datum->keys);
1231 datum->values = NULL;
1233 error = ovsdb_atom_from_json(&datum->keys[0], &type->key,
1242 /* Parses 'json' as a datum of the type described by 'type'. If successful,
1243 * returns NULL and initializes 'datum' with the parsed datum. On failure,
1244 * returns an error and the contents of 'datum' are indeterminate. The caller
1245 * is responsible for freeing the error or the datum that is returned.
1247 * Violations of constraints expressed by 'type' are treated as errors.
1249 * If 'symtab' is nonnull, then named UUIDs in 'symtab' are accepted. Refer to
1250 * ovsdb/SPECS for information about this, and for the syntax that this
1251 * function accepts. */
1252 struct ovsdb_error *
1253 ovsdb_datum_from_json(struct ovsdb_datum *datum,
1254 const struct ovsdb_type *type,
1255 const struct json *json,
1256 struct ovsdb_symbol_table *symtab)
1258 struct ovsdb_error *error;
1260 error = ovsdb_datum_from_json__(datum, type, json, symtab);
1265 error = ovsdb_datum_sort(datum, type->key.type);
1267 ovsdb_datum_destroy(datum, type);
1272 /* Converts 'datum', of the specified 'type', to JSON format, and returns the
1273 * JSON. The caller is responsible for freeing the returned JSON.
1275 * 'type' constraints on datum->n are ignored.
1277 * Refer to ovsdb/SPECS for the format of the JSON that this function
1280 ovsdb_datum_to_json(const struct ovsdb_datum *datum,
1281 const struct ovsdb_type *type)
1283 if (ovsdb_type_is_map(type)) {
1284 struct json **elems;
1287 elems = xmalloc(datum->n * sizeof *elems);
1288 for (i = 0; i < datum->n; i++) {
1289 elems[i] = json_array_create_2(
1290 ovsdb_atom_to_json(&datum->keys[i], type->key.type),
1291 ovsdb_atom_to_json(&datum->values[i], type->value.type));
1294 return wrap_json("map", json_array_create(elems, datum->n));
1295 } else if (datum->n == 1) {
1296 return ovsdb_atom_to_json(&datum->keys[0], type->key.type);
1298 struct json **elems;
1301 elems = xmalloc(datum->n * sizeof *elems);
1302 for (i = 0; i < datum->n; i++) {
1303 elems[i] = ovsdb_atom_to_json(&datum->keys[i], type->key.type);
1306 return wrap_json("set", json_array_create(elems, datum->n));
1311 skip_spaces(const char *p)
1313 while (isspace((unsigned char) *p)) {
1320 parse_atom_token(const char **s, const struct ovsdb_base_type *base,
1321 union ovsdb_atom *atom, struct ovsdb_symbol_table *symtab)
1323 char *token, *error;
1325 error = ovsdb_token_parse(s, &token);
1327 error = ovsdb_atom_from_string(atom, base, token, symtab);
1334 parse_key_value(const char **s, const struct ovsdb_type *type,
1335 union ovsdb_atom *key, union ovsdb_atom *value,
1336 struct ovsdb_symbol_table *symtab)
1338 const char *start = *s;
1341 error = parse_atom_token(s, &type->key, key, symtab);
1342 if (!error && type->value.type != OVSDB_TYPE_VOID) {
1343 *s = skip_spaces(*s);
1346 *s = skip_spaces(*s);
1347 error = parse_atom_token(s, &type->value, value, symtab);
1349 error = xasprintf("%s: syntax error at \"%c\" expecting \"=\"",
1353 ovsdb_atom_destroy(key, type->key.type);
1360 free_key_value(const struct ovsdb_type *type,
1361 union ovsdb_atom *key, union ovsdb_atom *value)
1363 ovsdb_atom_destroy(key, type->key.type);
1364 if (type->value.type != OVSDB_TYPE_VOID) {
1365 ovsdb_atom_destroy(value, type->value.type);
1369 /* Initializes 'datum' as a datum of the given 'type', parsing its contents
1370 * from 's'. The format of 's' is a series of space or comma separated atoms
1371 * or, for a map, '='-delimited pairs of atoms. Each atom must in a format
1372 * acceptable to ovsdb_atom_from_string(). Optionally, a set may be enclosed
1373 * in "[]" or a map in "{}"; for an empty set or map these punctuators are
1376 * Optionally, a symbol table may be supplied as 'symtab'. It is passed to
1377 * ovsdb_atom_to_string(). */
1379 ovsdb_datum_from_string(struct ovsdb_datum *datum,
1380 const struct ovsdb_type *type, const char *s,
1381 struct ovsdb_symbol_table *symtab)
1383 bool is_map = ovsdb_type_is_map(type);
1384 struct ovsdb_error *dberror;
1389 ovsdb_datum_init_empty(datum);
1391 /* Swallow a leading delimiter if there is one. */
1393 if (*p == (is_map ? '{' : '[')) {
1394 end_delim = is_map ? '}' : ']';
1395 p = skip_spaces(p + 1);
1398 return xstrdup("use \"{}\" to specify the empty map");
1400 return xstrdup("use \"[]\" to specify the empty set");
1406 while (*p && *p != end_delim) {
1407 union ovsdb_atom key, value;
1409 if (ovsdb_token_is_delim(*p)) {
1410 char *type_str = ovsdb_type_to_english(type);
1411 error = xasprintf("%s: unexpected \"%c\" parsing %s",
1418 error = parse_key_value(&p, type, &key, &value, symtab);
1422 ovsdb_datum_add_unsafe(datum, &key, &value, type);
1423 free_key_value(type, &key, &value);
1425 /* Skip optional white space and comma. */
1428 p = skip_spaces(p + 1);
1432 if (*p != end_delim) {
1433 error = xasprintf("%s: missing \"%c\" at end of data", s, end_delim);
1437 p = skip_spaces(p + 1);
1439 error = xasprintf("%s: trailing garbage after \"%c\"",
1445 if (datum->n < type->n_min) {
1446 error = xasprintf("%s: %u %s specified but the minimum number is %u",
1447 s, datum->n, is_map ? "pair(s)" : "value(s)",
1450 } else if (datum->n > type->n_max) {
1451 error = xasprintf("%s: %u %s specified but the maximum number is %u",
1452 s, datum->n, is_map ? "pair(s)" : "value(s)",
1457 dberror = ovsdb_datum_sort(datum, type->key.type);
1459 ovsdb_error_destroy(dberror);
1460 if (ovsdb_type_is_map(type)) {
1461 error = xasprintf("%s: map contains duplicate key", s);
1463 error = xasprintf("%s: set contains duplicate value", s);
1471 ovsdb_datum_destroy(datum, type);
1472 ovsdb_datum_init_empty(datum);
1476 /* Appends to 'out' the 'datum' (with the given 'type') in a format acceptable
1477 * to ovsdb_datum_from_string(). */
1479 ovsdb_datum_to_string(const struct ovsdb_datum *datum,
1480 const struct ovsdb_type *type, struct ds *out)
1482 bool is_map = ovsdb_type_is_map(type);
1485 if (type->n_max > 1 || !datum->n) {
1486 ds_put_char(out, is_map ? '{' : '[');
1488 for (i = 0; i < datum->n; i++) {
1490 ds_put_cstr(out, ", ");
1493 ovsdb_atom_to_string(&datum->keys[i], type->key.type, out);
1495 ds_put_char(out, '=');
1496 ovsdb_atom_to_string(&datum->values[i], type->value.type, out);
1499 if (type->n_max > 1 || !datum->n) {
1500 ds_put_char(out, is_map ? '}' : ']');
1504 /* Appends to 'out' the 'datum' (with the given 'type') in a bare string format
1505 * that cannot be parsed uniformly back into a datum but is easier for shell
1506 * scripts, etc., to deal with. */
1508 ovsdb_datum_to_bare(const struct ovsdb_datum *datum,
1509 const struct ovsdb_type *type, struct ds *out)
1511 bool is_map = ovsdb_type_is_map(type);
1514 for (i = 0; i < datum->n; i++) {
1516 ds_put_cstr(out, " ");
1519 ovsdb_atom_to_bare(&datum->keys[i], type->key.type, out);
1521 ds_put_char(out, '=');
1522 ovsdb_atom_to_bare(&datum->values[i], type->value.type, out);
1527 /* Initializes 'datum' as a string-to-string map whose contents are taken from
1528 * 'smap'. Destroys 'smap'. */
1530 ovsdb_datum_from_smap(struct ovsdb_datum *datum, struct smap *smap)
1532 struct smap_node *node, *next;
1535 datum->n = smap_count(smap);
1536 datum->keys = xmalloc(datum->n * sizeof *datum->keys);
1537 datum->values = xmalloc(datum->n * sizeof *datum->values);
1540 SMAP_FOR_EACH_SAFE (node, next, smap) {
1541 smap_steal(smap, node,
1542 &datum->keys[i].string, &datum->values[i].string);
1545 assert(i == datum->n);
1548 ovsdb_datum_sort_unique(datum, OVSDB_TYPE_STRING, OVSDB_TYPE_STRING);
1552 hash_atoms(enum ovsdb_atomic_type type, const union ovsdb_atom *atoms,
1553 unsigned int n, uint32_t basis)
1555 if (type != OVSDB_TYPE_VOID) {
1558 for (i = 0; i < n; i++) {
1559 basis = ovsdb_atom_hash(&atoms[i], type, basis);
1566 ovsdb_datum_hash(const struct ovsdb_datum *datum,
1567 const struct ovsdb_type *type, uint32_t basis)
1569 basis = hash_atoms(type->key.type, datum->keys, datum->n, basis);
1570 basis ^= (type->key.type << 24) | (type->value.type << 16) | datum->n;
1571 basis = hash_atoms(type->value.type, datum->values, datum->n, basis);
1576 atom_arrays_compare_3way(const union ovsdb_atom *a,
1577 const union ovsdb_atom *b,
1578 enum ovsdb_atomic_type type,
1583 for (i = 0; i < n; i++) {
1584 int cmp = ovsdb_atom_compare_3way(&a[i], &b[i], type);
1594 ovsdb_datum_equals(const struct ovsdb_datum *a,
1595 const struct ovsdb_datum *b,
1596 const struct ovsdb_type *type)
1598 return !ovsdb_datum_compare_3way(a, b, type);
1602 ovsdb_datum_compare_3way(const struct ovsdb_datum *a,
1603 const struct ovsdb_datum *b,
1604 const struct ovsdb_type *type)
1609 return a->n < b->n ? -1 : 1;
1612 cmp = atom_arrays_compare_3way(a->keys, b->keys, type->key.type, a->n);
1617 return (type->value.type == OVSDB_TYPE_VOID ? 0
1618 : atom_arrays_compare_3way(a->values, b->values, type->value.type,
1622 /* If 'key' is one of the keys in 'datum', returns its index within 'datum',
1623 * otherwise UINT_MAX. 'key.type' must be the type of the atoms stored in the
1624 * 'keys' array in 'datum'.
1627 ovsdb_datum_find_key(const struct ovsdb_datum *datum,
1628 const union ovsdb_atom *key,
1629 enum ovsdb_atomic_type key_type)
1631 unsigned int low = 0;
1632 unsigned int high = datum->n;
1633 while (low < high) {
1634 unsigned int idx = (low + high) / 2;
1635 int cmp = ovsdb_atom_compare_3way(key, &datum->keys[idx], key_type);
1638 } else if (cmp > 0) {
1647 /* If 'key' and 'value' is one of the key-value pairs in 'datum', returns its
1648 * index within 'datum', otherwise UINT_MAX. 'key.type' must be the type of
1649 * the atoms stored in the 'keys' array in 'datum'. 'value_type' may be the
1650 * type of the 'values' atoms or OVSDB_TYPE_VOID to compare only keys.
1653 ovsdb_datum_find_key_value(const struct ovsdb_datum *datum,
1654 const union ovsdb_atom *key,
1655 enum ovsdb_atomic_type key_type,
1656 const union ovsdb_atom *value,
1657 enum ovsdb_atomic_type value_type)
1659 unsigned int idx = ovsdb_datum_find_key(datum, key, key_type);
1661 && value_type != OVSDB_TYPE_VOID
1662 && !ovsdb_atom_equals(&datum->values[idx], value, value_type)) {
1668 /* If atom 'i' in 'a' is also in 'b', returns its index in 'b', otherwise
1669 * UINT_MAX. 'type' must be the type of 'a' and 'b', except that
1670 * type->value.type may be set to OVSDB_TYPE_VOID to compare keys but not
1673 ovsdb_datum_find(const struct ovsdb_datum *a, int i,
1674 const struct ovsdb_datum *b,
1675 const struct ovsdb_type *type)
1677 return ovsdb_datum_find_key_value(b,
1678 &a->keys[i], type->key.type,
1679 a->values ? &a->values[i] : NULL,
1683 /* Returns true if every element in 'a' is also in 'b', false otherwise. */
1685 ovsdb_datum_includes_all(const struct ovsdb_datum *a,
1686 const struct ovsdb_datum *b,
1687 const struct ovsdb_type *type)
1694 for (i = 0; i < a->n; i++) {
1695 if (ovsdb_datum_find(a, i, b, type) == UINT_MAX) {
1702 /* Returns true if no element in 'a' is also in 'b', false otherwise. */
1704 ovsdb_datum_excludes_all(const struct ovsdb_datum *a,
1705 const struct ovsdb_datum *b,
1706 const struct ovsdb_type *type)
1710 for (i = 0; i < a->n; i++) {
1711 if (ovsdb_datum_find(a, i, b, type) != UINT_MAX) {
1719 ovsdb_datum_reallocate(struct ovsdb_datum *a, const struct ovsdb_type *type,
1720 unsigned int capacity)
1722 a->keys = xrealloc(a->keys, capacity * sizeof *a->keys);
1723 if (type->value.type != OVSDB_TYPE_VOID) {
1724 a->values = xrealloc(a->values, capacity * sizeof *a->values);
1728 /* Removes the element with index 'idx' from 'datum', which has type 'type'.
1729 * If 'idx' is not the last element in 'datum', then the removed element is
1730 * replaced by the (former) last element.
1732 * This function does not maintain ovsdb_datum invariants. Use
1733 * ovsdb_datum_sort() to check and restore these invariants. */
1735 ovsdb_datum_remove_unsafe(struct ovsdb_datum *datum, size_t idx,
1736 const struct ovsdb_type *type)
1738 ovsdb_atom_destroy(&datum->keys[idx], type->key.type);
1739 datum->keys[idx] = datum->keys[datum->n - 1];
1740 if (type->value.type != OVSDB_TYPE_VOID) {
1741 ovsdb_atom_destroy(&datum->values[idx], type->value.type);
1742 datum->values[idx] = datum->values[datum->n - 1];
1747 /* Adds the element with the given 'key' and 'value' to 'datum', which must
1748 * have the specified 'type'.
1750 * This function always allocates memory, so it is not an efficient way to add
1751 * a number of elements to a datum.
1753 * This function does not maintain ovsdb_datum invariants. Use
1754 * ovsdb_datum_sort() to check and restore these invariants. (But a datum with
1755 * 0 or 1 elements cannot violate the invariants anyhow.) */
1757 ovsdb_datum_add_unsafe(struct ovsdb_datum *datum,
1758 const union ovsdb_atom *key,
1759 const union ovsdb_atom *value,
1760 const struct ovsdb_type *type)
1762 size_t idx = datum->n++;
1763 datum->keys = xrealloc(datum->keys, datum->n * sizeof *datum->keys);
1764 ovsdb_atom_clone(&datum->keys[idx], key, type->key.type);
1765 if (type->value.type != OVSDB_TYPE_VOID) {
1766 datum->values = xrealloc(datum->values,
1767 datum->n * sizeof *datum->values);
1768 ovsdb_atom_clone(&datum->values[idx], value, type->value.type);
1773 ovsdb_datum_union(struct ovsdb_datum *a, const struct ovsdb_datum *b,
1774 const struct ovsdb_type *type, bool replace)
1780 for (bi = 0; bi < b->n; bi++) {
1783 ai = ovsdb_datum_find_key(a, &b->keys[bi], type->key.type);
1784 if (ai == UINT_MAX) {
1786 ovsdb_datum_reallocate(a, type, a->n + (b->n - bi));
1788 ovsdb_atom_clone(&a->keys[n], &b->keys[bi], type->key.type);
1789 if (type->value.type != OVSDB_TYPE_VOID) {
1790 ovsdb_atom_clone(&a->values[n], &b->values[bi],
1794 } else if (replace && type->value.type != OVSDB_TYPE_VOID) {
1795 ovsdb_atom_destroy(&a->values[ai], type->value.type);
1796 ovsdb_atom_clone(&a->values[ai], &b->values[bi],
1801 struct ovsdb_error *error;
1803 error = ovsdb_datum_sort(a, type->key.type);
1809 ovsdb_datum_subtract(struct ovsdb_datum *a, const struct ovsdb_type *a_type,
1810 const struct ovsdb_datum *b,
1811 const struct ovsdb_type *b_type)
1813 bool changed = false;
1816 assert(a_type->key.type == b_type->key.type);
1817 assert(a_type->value.type == b_type->value.type
1818 || b_type->value.type == OVSDB_TYPE_VOID);
1820 /* XXX The big-O of this could easily be improved. */
1821 for (i = 0; i < a->n; ) {
1822 unsigned int idx = ovsdb_datum_find(a, i, b, b_type);
1823 if (idx != UINT_MAX) {
1825 ovsdb_datum_remove_unsafe(a, i, a_type);
1831 ovsdb_datum_sort_assert(a, a_type->key.type);
1835 struct ovsdb_symbol_table *
1836 ovsdb_symbol_table_create(void)
1838 struct ovsdb_symbol_table *symtab = xmalloc(sizeof *symtab);
1839 shash_init(&symtab->sh);
1844 ovsdb_symbol_table_destroy(struct ovsdb_symbol_table *symtab)
1847 shash_destroy_free_data(&symtab->sh);
1852 struct ovsdb_symbol *
1853 ovsdb_symbol_table_get(const struct ovsdb_symbol_table *symtab,
1856 return shash_find_data(&symtab->sh, name);
1859 struct ovsdb_symbol *
1860 ovsdb_symbol_table_put(struct ovsdb_symbol_table *symtab, const char *name,
1861 const struct uuid *uuid, bool created)
1863 struct ovsdb_symbol *symbol;
1865 assert(!ovsdb_symbol_table_get(symtab, name));
1866 symbol = xmalloc(sizeof *symbol);
1867 symbol->uuid = *uuid;
1868 symbol->created = created;
1869 symbol->strong_ref = false;
1870 symbol->weak_ref = false;
1871 shash_add(&symtab->sh, name, symbol);
1875 struct ovsdb_symbol *
1876 ovsdb_symbol_table_insert(struct ovsdb_symbol_table *symtab,
1879 struct ovsdb_symbol *symbol;
1881 symbol = ovsdb_symbol_table_get(symtab, name);
1885 uuid_generate(&uuid);
1886 symbol = ovsdb_symbol_table_put(symtab, name, &uuid, false);
1891 /* Extracts a token from the beginning of 's' and returns a pointer just after
1892 * the token. Stores the token itself into '*outp', which the caller is
1893 * responsible for freeing (with free()).
1895 * If 's[0]' is a delimiter, the returned token is the empty string.
1897 * A token extends from 's' to the first delimiter, as defined by
1898 * ovsdb_token_is_delim(), or until the end of the string. A delimiter can be
1899 * escaped with a backslash, in which case the backslash does not appear in the
1900 * output. Double quotes also cause delimiters to be ignored, but the double
1901 * quotes are retained in the output. (Backslashes inside double quotes are
1902 * not removed, either.)
1905 ovsdb_token_parse(const char **s, char **outp)
1914 for (p = *s; *p != '\0'; ) {
1918 ds_put_char(&out, '\\');
1921 error = xasprintf("%s: backslash at end of argument", *s);
1924 ds_put_char(&out, *p++);
1925 } else if (!in_quotes && ovsdb_token_is_delim(c)) {
1929 ds_put_char(&out, c);
1931 in_quotes = !in_quotes;
1936 error = xasprintf("%s: quoted string extends past end of argument",
1940 *outp = ds_cstr(&out);
1950 /* Returns true if 'c' delimits tokens, or if 'c' is 0, and false otherwise. */
1952 ovsdb_token_is_delim(unsigned char c)
1954 return strchr(":=, []{}!<>", c) != NULL;