-/* Copyright (c) 2009 Nicira Networks
+/* Copyright (c) 2009, 2010 Nicira Networks
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#include "ovsdb-data.h"
#include <assert.h>
+#include <ctype.h>
+#include <float.h>
+#include <inttypes.h>
+#include <limits.h>
+#include "dynamic-string.h"
#include "hash.h"
#include "ovsdb-error.h"
#include "json.h"
}
}
+bool
+ovsdb_atom_is_default(const union ovsdb_atom *atom,
+ enum ovsdb_atomic_type type)
+{
+ switch (type) {
+ case OVSDB_TYPE_VOID:
+ NOT_REACHED();
+
+ case OVSDB_TYPE_INTEGER:
+ return atom->integer == 0;
+
+ case OVSDB_TYPE_REAL:
+ return atom->real == 0.0;
+
+ case OVSDB_TYPE_BOOLEAN:
+ return atom->boolean == false;
+
+ case OVSDB_TYPE_STRING:
+ return atom->string[0] == '\0';
+
+ case OVSDB_TYPE_UUID:
+ return uuid_is_zero(&atom->uuid);
+
+ case OVSDB_N_TYPES:
+ default:
+ NOT_REACHED();
+ }
+}
+
void
ovsdb_atom_clone(union ovsdb_atom *new, const union ovsdb_atom *old,
enum ovsdb_atomic_type type)
NOT_REACHED();
}
}
+
+/* Initializes 'atom' to a value of the given 'type' parsed from 's', which
+ * takes one of the following forms:
+ *
+ * - OVSDB_TYPE_INTEGER: A decimal integer optionally preceded by a sign.
+ *
+ * - OVSDB_TYPE_REAL: A floating-point number in the format accepted by
+ * strtod().
+ *
+ * - OVSDB_TYPE_BOOLEAN: "true", "yes", "on", "1" for true, or "false",
+ * "no", "off", or "0" for false.
+ *
+ * - OVSDB_TYPE_STRING: A JSON string if it begins with a quote, otherwise
+ * an arbitrary string.
+ *
+ * - OVSDB_TYPE_UUID: A UUID in RFC 4122 format.
+ *
+ * Returns a null pointer if successful, otherwise an error message describing
+ * the problem. The caller is responsible for freeing the error.
+ */
+char *
+ovsdb_atom_from_string(union ovsdb_atom *atom, enum ovsdb_atomic_type type,
+ const char *s)
+{
+ switch (type) {
+ case OVSDB_TYPE_VOID:
+ NOT_REACHED();
+
+ case OVSDB_TYPE_INTEGER: {
+ long long int integer;
+ if (!str_to_llong(s, 10, &integer)) {
+ return xasprintf("\"%s\" is not a valid integer", s);
+ }
+ atom->integer = integer;
+ }
+ break;
+
+ case OVSDB_TYPE_REAL:
+ if (!str_to_double(s, &atom->real)) {
+ return xasprintf("\"%s\" is not a valid real number", s);
+ }
+ break;
+
+ case OVSDB_TYPE_BOOLEAN:
+ if (!strcmp(s, "true") || !strcmp(s, "yes") || !strcmp(s, "on")
+ || !strcmp(s, "1")) {
+ atom->boolean = true;
+ } else if (!strcmp(s, "false") || !strcmp(s, "no") || !strcmp(s, "off")
+ || !strcmp(s, "0")) {
+ atom->boolean = false;
+ } else {
+ return xasprintf("\"%s\" is not a valid boolean "
+ "(use \"true\" or \"false\")", s);
+ }
+ break;
+
+ case OVSDB_TYPE_STRING:
+ if (*s == '\0') {
+ return xstrdup("An empty string is not valid as input; "
+ "use \"\" to represent the empty string");
+ } else if (*s == '"') {
+ size_t s_len = strlen(s);
+
+ if (s_len < 2 || s[s_len - 1] != '"') {
+ return xasprintf("%s: missing quote at end of "
+ "quoted string", s);
+ } else if (!json_string_unescape(s + 1, s_len - 2,
+ &atom->string)) {
+ char *error = xasprintf("%s: %s", s, atom->string);
+ free(atom->string);
+ return error;
+ }
+ } else {
+ atom->string = xstrdup(s);
+ }
+ break;
+
+ case OVSDB_TYPE_UUID:
+ if (!uuid_from_string(&atom->uuid, s)) {
+ return xasprintf("\"%s\" is not a valid UUID", s);
+ }
+ break;
+
+ case OVSDB_N_TYPES:
+ default:
+ NOT_REACHED();
+ }
+
+ return NULL;
+}
+
+static bool
+string_needs_quotes(const char *s)
+{
+ const char *p = s;
+ unsigned char c;
+
+ c = *p++;
+ if (!isalpha(c) && c != '_') {
+ return true;
+ }
+
+ while ((c = *p++) != '\0') {
+ if (!isalpha(c) && c != '_' && c != '-' && c != '.') {
+ return true;
+ }
+ }
+
+ if (!strcmp(s, "true") || !strcmp(s, "false")) {
+ return true;
+ }
+
+ return false;
+}
+
+/* Appends 'atom' (which has the given 'type') to 'out', in a format acceptable
+ * to ovsdb_atom_from_string(). */
+void
+ovsdb_atom_to_string(const union ovsdb_atom *atom, enum ovsdb_atomic_type type,
+ struct ds *out)
+{
+ switch (type) {
+ case OVSDB_TYPE_VOID:
+ NOT_REACHED();
+
+ case OVSDB_TYPE_INTEGER:
+ ds_put_format(out, "%"PRId64, atom->integer);
+ break;
+
+ case OVSDB_TYPE_REAL:
+ ds_put_format(out, "%.*g", DBL_DIG, atom->real);
+ break;
+
+ case OVSDB_TYPE_BOOLEAN:
+ ds_put_cstr(out, atom->boolean ? "true" : "false");
+ break;
+
+ case OVSDB_TYPE_STRING:
+ if (string_needs_quotes(atom->string)) {
+ struct json json;
+
+ json.type = JSON_STRING;
+ json.u.string = atom->string;
+ json_to_ds(&json, 0, out);
+ } else {
+ ds_put_cstr(out, atom->string);
+ }
+ break;
+
+ case OVSDB_TYPE_UUID:
+ ds_put_format(out, UUID_FMT, UUID_ARGS(&atom->uuid));
+ break;
+
+ case OVSDB_N_TYPES:
+ default:
+ NOT_REACHED();
+ }
+}
\f
static union ovsdb_atom *
alloc_default_atoms(enum ovsdb_atomic_type type, size_t n)
}
}
+void
+ovsdb_datum_init_empty(struct ovsdb_datum *datum)
+{
+ datum->n = 0;
+ datum->keys = NULL;
+ datum->values = NULL;
+}
+
void
ovsdb_datum_init_default(struct ovsdb_datum *datum,
const struct ovsdb_type *type)
datum->values = alloc_default_atoms(type->value_type, datum->n);
}
+bool
+ovsdb_datum_is_default(const struct ovsdb_datum *datum,
+ const struct ovsdb_type *type)
+{
+ size_t i;
+
+ if (datum->n != type->n_min) {
+ return false;
+ }
+ for (i = 0; i < datum->n; i++) {
+ if (!ovsdb_atom_is_default(&datum->keys[i], type->key_type)) {
+ return false;
+ }
+ if (type->value_type != OVSDB_TYPE_VOID
+ && !ovsdb_atom_is_default(&datum->values[i], type->value_type)) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
static union ovsdb_atom *
clone_atoms(const union ovsdb_atom *old, enum ovsdb_atomic_type type, size_t n)
{
}
}
-static struct ovsdb_error *
+struct ovsdb_error *
ovsdb_datum_sort(struct ovsdb_datum *datum, const struct ovsdb_type *type)
{
if (datum->n < 2) {
}
}
+static const char *
+skip_spaces(const char *p)
+{
+ return p + strspn(p, " ");
+}
+
+static char *
+parse_atom_token(const char **s, enum ovsdb_atomic_type type,
+ union ovsdb_atom *atom)
+{
+ char *token, *error;
+
+ error = ovsdb_token_parse(s, &token);
+ if (!error) {
+ error = ovsdb_atom_from_string(atom, type, token);
+ free(token);
+ }
+ return error;
+}
+
+
+static char *
+parse_key_value(const char **s, const struct ovsdb_type *type,
+ union ovsdb_atom *key, union ovsdb_atom *value)
+{
+ const char *start = *s;
+ char *error;
+
+ error = parse_atom_token(s, type->key_type, key);
+ if (!error && type->value_type != OVSDB_TYPE_VOID) {
+ if (**s == '=') {
+ (*s)++;
+ error = parse_atom_token(s, type->value_type, value);
+ } else {
+ error = xasprintf("%s: syntax error at \"%c\" expecting \"=\"",
+ start, **s);
+ }
+ if (error) {
+ ovsdb_atom_destroy(key, type->key_type);
+ }
+ }
+ return error;
+}
+
+static void
+free_key_value(const struct ovsdb_type *type,
+ union ovsdb_atom *key, union ovsdb_atom *value)
+{
+ ovsdb_atom_destroy(key, type->key_type);
+ if (type->value_type != OVSDB_TYPE_VOID) {
+ ovsdb_atom_destroy(value, type->value_type);
+ }
+}
+
+/* Initializes 'datum' as a datum of the given 'type', parsing its contents
+ * from 's'. The format of 's' is a series of space or comma separated atoms
+ * or, for a map, '='-delimited pairs of atoms. Each atom must in a format
+ * acceptable to ovsdb_atom_from_string(). Optionally, a set may be enclosed
+ * in "[]" or a map in "{}"; for an empty set or map these punctuators are
+ * required. */
+char *
+ovsdb_datum_from_string(struct ovsdb_datum *datum,
+ const struct ovsdb_type *type, const char *s)
+{
+ bool is_map = ovsdb_type_is_map(type);
+ struct ovsdb_error *dberror;
+ const char *p;
+ int end_delim;
+ char *error;
+
+ ovsdb_datum_init_empty(datum);
+
+ /* Swallow a leading delimiter if there is one. */
+ p = skip_spaces(s);
+ if (*p == (is_map ? '{' : '[')) {
+ end_delim = is_map ? '}' : ']';
+ p = skip_spaces(p + 1);
+ } else if (!*p) {
+ if (is_map) {
+ return xstrdup("use \"{}\" to specify the empty map");
+ } else {
+ return xstrdup("use \"[]\" to specify the empty set");
+ }
+ } else {
+ end_delim = 0;
+ }
+
+ while (*p && *p != end_delim) {
+ union ovsdb_atom key, value;
+
+ if (ovsdb_token_is_delim(*p)) {
+ error = xasprintf("%s: unexpected \"%c\" parsing %s",
+ s, *p, ovsdb_type_to_english(type));
+ goto error;
+ }
+
+ /* Add to datum. */
+ error = parse_key_value(&p, type, &key, &value);
+ if (error) {
+ goto error;
+ }
+ ovsdb_datum_add_unsafe(datum, &key, &value, type);
+ free_key_value(type, &key, &value);
+
+ /* Skip optional white space and comma. */
+ p = skip_spaces(p);
+ if (*p == ',') {
+ p = skip_spaces(p + 1);
+ }
+ }
+
+ if (*p != end_delim) {
+ error = xasprintf("%s: missing \"%c\" at end of data", s, end_delim);
+ goto error;
+ }
+ if (end_delim) {
+ p = skip_spaces(p + 1);
+ if (*p) {
+ error = xasprintf("%s: trailing garbage after \"%c\"",
+ s, end_delim);
+ goto error;
+ }
+ }
+
+ if (datum->n < type->n_min) {
+ error = xasprintf("%s: %u %s specified but the minimum number is %u",
+ s, datum->n, is_map ? "pair(s)" : "value(s)",
+ type->n_min);
+ goto error;
+ } else if (datum->n > type->n_max) {
+ error = xasprintf("%s: %u %s specified but the maximum number is %u",
+ s, datum->n, is_map ? "pair(s)" : "value(s)",
+ type->n_max);
+ goto error;
+ }
+
+ dberror = ovsdb_datum_sort(datum, type);
+ if (dberror) {
+ ovsdb_error_destroy(dberror);
+ if (ovsdb_type_is_map(type)) {
+ error = xasprintf("%s: map contains duplicate key", s);
+ } else {
+ error = xasprintf("%s: set contains duplicate value", s);
+ }
+ goto error;
+ }
+
+ return NULL;
+
+error:
+ ovsdb_datum_destroy(datum, type);
+ ovsdb_datum_init_empty(datum);
+ return error;
+}
+
+/* Appends to 'out' the 'datum' (with the given 'type') in a format acceptable
+ * to ovsdb_datum_from_string(). */
+void
+ovsdb_datum_to_string(const struct ovsdb_datum *datum,
+ const struct ovsdb_type *type, struct ds *out)
+{
+ bool is_map = ovsdb_type_is_map(type);
+ size_t i;
+
+ if (type->n_max > 1 || !datum->n) {
+ ds_put_char(out, is_map ? '{' : '[');
+ }
+ for (i = 0; i < datum->n; i++) {
+ if (i > 0) {
+ ds_put_cstr(out, ", ");
+ }
+
+ ovsdb_atom_to_string(&datum->keys[i], type->key_type, out);
+ if (is_map) {
+ ds_put_char(out, '=');
+ ovsdb_atom_to_string(&datum->values[i], type->value_type, out);
+ }
+ }
+ if (type->n_max > 1 || !datum->n) {
+ ds_put_char(out, is_map ? '}' : ']');
+ }
+}
+
static uint32_t
hash_atoms(enum ovsdb_atomic_type type, const union ovsdb_atom *atoms,
unsigned int n, uint32_t basis)
static int
atom_arrays_compare_3way(const union ovsdb_atom *a,
- const union ovsdb_atom *b,
- enum ovsdb_atomic_type type,
- size_t n)
+ const union ovsdb_atom *b,
+ enum ovsdb_atomic_type type,
+ size_t n)
{
unsigned int i;
a->n));
}
-static bool
-ovsdb_datum_contains(const struct ovsdb_datum *a, int i,
- const struct ovsdb_datum *b,
- const struct ovsdb_type *type)
+/* If 'key' is one of the keys in 'datum', returns its index within 'datum',
+ * otherwise UINT_MAX. 'key_type' must be the type of the atoms stored in the
+ * 'keys' array in 'datum'.
+ */
+unsigned int
+ovsdb_datum_find_key(const struct ovsdb_datum *datum,
+ const union ovsdb_atom *key,
+ enum ovsdb_atomic_type key_type)
{
- int low = 0;
- int high = b->n;
+ unsigned int low = 0;
+ unsigned int high = datum->n;
while (low < high) {
- int j = (low + high) / 2;
- int cmp = ovsdb_atom_compare_3way(&a->keys[i], &b->keys[j], type->key_type);
+ unsigned int idx = (low + high) / 2;
+ int cmp = ovsdb_atom_compare_3way(key, &datum->keys[idx], key_type);
if (cmp < 0) {
- high = j;
+ high = idx;
} else if (cmp > 0) {
- low = j + 1;
+ low = idx + 1;
} else {
- return (type->value_type == OVSDB_TYPE_VOID
- || ovsdb_atom_equals(&a->values[i], &b->values[j],
- type->value_type));
+ return idx;
}
}
- return false;
+ return UINT_MAX;
+}
+
+/* If 'key' and 'value' is one of the key-value pairs in 'datum', returns its
+ * index within 'datum', otherwise UINT_MAX. 'key_type' must be the type of
+ * the atoms stored in the 'keys' array in 'datum'. 'value_type' may be the
+ * type of the 'values' atoms or OVSDB_TYPE_VOID to compare only keys.
+ */
+unsigned int
+ovsdb_datum_find_key_value(const struct ovsdb_datum *datum,
+ const union ovsdb_atom *key,
+ enum ovsdb_atomic_type key_type,
+ const union ovsdb_atom *value,
+ enum ovsdb_atomic_type value_type)
+{
+ unsigned int idx = ovsdb_datum_find_key(datum, key, key_type);
+ if (idx != UINT_MAX
+ && value_type != OVSDB_TYPE_VOID
+ && !ovsdb_atom_equals(&datum->values[idx], value, value_type)) {
+ idx = UINT_MAX;
+ }
+ return idx;
+}
+
+/* If atom 'i' in 'a' is also in 'b', returns its index in 'b', otherwise
+ * UINT_MAX. 'type' must be the type of 'a' and 'b', except that
+ * type->value_type may be set to OVSDB_TYPE_VOID to compare keys but not
+ * values. */
+static unsigned int
+ovsdb_datum_find(const struct ovsdb_datum *a, int i,
+ const struct ovsdb_datum *b,
+ const struct ovsdb_type *type)
+{
+ return ovsdb_datum_find_key_value(b,
+ &a->keys[i], type->key_type,
+ a->values ? &a->values[i] : NULL,
+ type->value_type);
}
/* Returns true if every element in 'a' is also in 'b', false otherwise. */
size_t i;
for (i = 0; i < a->n; i++) {
- if (!ovsdb_datum_contains(a, i, b, type)) {
+ if (ovsdb_datum_find(a, i, b, type) == UINT_MAX) {
return false;
}
}
size_t i;
for (i = 0; i < a->n; i++) {
- if (ovsdb_datum_contains(a, i, b, type)) {
+ if (ovsdb_datum_find(a, i, b, type) != UINT_MAX) {
return false;
}
}
return true;
}
+
+static void
+ovsdb_datum_reallocate(struct ovsdb_datum *a, const struct ovsdb_type *type,
+ unsigned int capacity)
+{
+ a->keys = xrealloc(a->keys, capacity * sizeof *a->keys);
+ if (type->value_type != OVSDB_TYPE_VOID) {
+ a->values = xrealloc(a->values, capacity * sizeof *a->values);
+ }
+}
+
+/* Removes the element with index 'idx' from 'datum', which has type 'type'.
+ * If 'idx' is not the last element in 'datum', then the removed element is
+ * replaced by the (former) last element.
+ *
+ * This function does not maintain ovsdb_datum invariants. Use
+ * ovsdb_datum_sort() to check and restore these invariants. */
+void
+ovsdb_datum_remove_unsafe(struct ovsdb_datum *datum, size_t idx,
+ const struct ovsdb_type *type)
+{
+ ovsdb_atom_destroy(&datum->keys[idx], type->key_type);
+ datum->keys[idx] = datum->keys[datum->n - 1];
+ if (type->value_type != OVSDB_TYPE_VOID) {
+ ovsdb_atom_destroy(&datum->values[idx], type->value_type);
+ datum->values[idx] = datum->values[datum->n - 1];
+ }
+ datum->n--;
+}
+
+/* Adds the element with the given 'key' and 'value' to 'datum', which must
+ * have the specified 'type'.
+ *
+ * This function always allocates memory, so it is not an efficient way to add
+ * a number of elements to a datum.
+ *
+ * This function does not maintain ovsdb_datum invariants. Use
+ * ovsdb_datum_sort() to check and restore these invariants. (But a datum with
+ * 0 or 1 elements cannot violate the invariants anyhow.) */
+void
+ovsdb_datum_add_unsafe(struct ovsdb_datum *datum,
+ const union ovsdb_atom *key,
+ const union ovsdb_atom *value,
+ const struct ovsdb_type *type)
+{
+ size_t idx = datum->n++;
+ datum->keys = xrealloc(datum->keys, datum->n * sizeof *datum->keys);
+ ovsdb_atom_clone(&datum->keys[idx], key, type->key_type);
+ if (type->value_type != OVSDB_TYPE_VOID) {
+ datum->values = xrealloc(datum->values,
+ datum->n * sizeof *datum->values);
+ ovsdb_atom_clone(&datum->values[idx], value, type->value_type);
+ }
+}
+
+void
+ovsdb_datum_union(struct ovsdb_datum *a, const struct ovsdb_datum *b,
+ const struct ovsdb_type *type, bool replace)
+{
+ unsigned int n;
+ size_t bi;
+
+ n = a->n;
+ for (bi = 0; bi < b->n; bi++) {
+ unsigned int ai;
+
+ ai = ovsdb_datum_find_key(a, &b->keys[bi], type->key_type);
+ if (ai == UINT_MAX) {
+ if (n == a->n) {
+ ovsdb_datum_reallocate(a, type, a->n + (b->n - bi));
+ }
+ ovsdb_atom_clone(&a->keys[n], &b->keys[bi], type->key_type);
+ if (type->value_type != OVSDB_TYPE_VOID) {
+ ovsdb_atom_clone(&a->values[n], &b->values[bi],
+ type->value_type);
+ }
+ n++;
+ } else if (replace && type->value_type != OVSDB_TYPE_VOID) {
+ ovsdb_atom_destroy(&a->values[ai], type->value_type);
+ ovsdb_atom_clone(&a->values[ai], &b->values[bi],
+ type->value_type);
+ }
+ }
+ if (n != a->n) {
+ struct ovsdb_error *error;
+ a->n = n;
+ error = ovsdb_datum_sort(a, type);
+ assert(!error);
+ }
+}
+
+void
+ovsdb_datum_subtract(struct ovsdb_datum *a, const struct ovsdb_type *a_type,
+ const struct ovsdb_datum *b,
+ const struct ovsdb_type *b_type)
+{
+ bool changed = false;
+ size_t i;
+
+ assert(a_type->key_type == b_type->key_type);
+ assert(a_type->value_type == b_type->value_type
+ || b_type->value_type == OVSDB_TYPE_VOID);
+
+ /* XXX The big-O of this could easily be improved. */
+ for (i = 0; i < a->n; ) {
+ unsigned int idx = ovsdb_datum_find(a, i, b, b_type);
+ if (idx != UINT_MAX) {
+ changed = true;
+ ovsdb_datum_remove_unsafe(a, i, a_type);
+ } else {
+ i++;
+ }
+ }
+ if (changed) {
+ struct ovsdb_error *error = ovsdb_datum_sort(a, a_type);
+ assert(!error);
+ }
+}
\f
struct ovsdb_symbol_table {
struct shash sh;
symbol->used = used;
shash_add(&symtab->sh, name, symbol);
}
+\f
+/* Extracts a token from the beginning of 's' and returns a pointer just after
+ * the token. Stores the token itself into '*outp', which the caller is
+ * responsible for freeing (with free()).
+ *
+ * If 's[0]' is a delimiter, the returned token is the empty string.
+ *
+ * A token extends from 's' to the first delimiter, as defined by
+ * ovsdb_token_is_delim(), or until the end of the string. A delimiter can be
+ * escaped with a backslash, in which case the backslash does not appear in the
+ * output. Double quotes also cause delimiters to be ignored, but the double
+ * quotes are retained in the output. (Backslashes inside double quotes are
+ * not removed, either.)
+ */
+char *
+ovsdb_token_parse(const char **s, char **outp)
+{
+ const char *p;
+ struct ds out;
+ bool in_quotes;
+ char *error;
+
+ ds_init(&out);
+ in_quotes = false;
+ for (p = *s; *p != '\0'; ) {
+ int c = *p++;
+ if (c == '\\') {
+ if (in_quotes) {
+ ds_put_char(&out, '\\');
+ }
+ if (!*p) {
+ error = xasprintf("%s: backslash at end of argument", *s);
+ goto error;
+ }
+ ds_put_char(&out, *p++);
+ } else if (!in_quotes && ovsdb_token_is_delim(c)) {
+ p--;
+ break;
+ } else {
+ ds_put_char(&out, c);
+ if (c == '"') {
+ in_quotes = !in_quotes;
+ }
+ }
+ }
+ if (in_quotes) {
+ error = xasprintf("%s: quoted string extends past end of argument",
+ *s);
+ goto error;
+ }
+ *outp = ds_cstr(&out);
+ *s = p;
+ return NULL;
+
+error:
+ ds_destroy(&out);
+ *outp = NULL;
+ return error;
+}
+
+/* Returns true if 'c' delimits tokens, or if 'c' is 0, and false otherwise. */
+bool
+ovsdb_token_is_delim(unsigned char c)
+{
+ return strchr(":=, []{}", c) != NULL;
+}
projects / openvswitch / blobdiff