/* Copyright (c) 2012, 2014, 2015, 2016 Nicira, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.  */

#ifndef SMAP_H
#define SMAP_H 1

#include <sys/types.h>
#include <netinet/in.h>
#include "hash.h"
#include "openvswitch/hmap.h"

#ifdef __cplusplus
extern "C" {
#endif

struct json;
struct uuid;

/* A map from string to string. */
struct smap {
    struct hmap map;           /* Contains "struct smap_node"s. */
};

struct smap_node {
    struct hmap_node node;     /* In struct smap's 'map' hmap. */
    char *key;
    char *value;
};

#define SMAP_INITIALIZER(SMAP) { HMAP_INITIALIZER(&(SMAP)->map) }

#define SMAP_FOR_EACH(SMAP_NODE, SMAP)                                  \
    HMAP_FOR_EACH_INIT (SMAP_NODE, node, &(SMAP)->map,                  \
                        BUILD_ASSERT_TYPE(SMAP_NODE, struct smap_node *), \
                        BUILD_ASSERT_TYPE(SMAP, struct smap *))

#define SMAP_FOR_EACH_SAFE_SHORT(SMAP_NODE, SMAP)           \
    HMAP_FOR_EACH_SAFE_SHORT_INIT (                         \
        SMAP_NODE, node, &(SMAP)->map,                      \
        BUILD_ASSERT_TYPE(SMAP_NODE, struct smap_node *),   \
        BUILD_ASSERT_TYPE(SMAP, struct smap *))

#define SMAP_FOR_EACH_SAFE_LONG(SMAP_NODE, NEXT, SMAP)      \
    HMAP_FOR_EACH_SAFE_LONG_INIT (                          \
        SMAP_NODE, NEXT, node, &(SMAP)->map,                \
        BUILD_ASSERT_TYPE(SMAP_NODE, struct smap_node *),   \
        BUILD_ASSERT_TYPE(NEXT, struct smap_node *),        \
        BUILD_ASSERT_TYPE(SMAP, struct smap *))

#define SMAP_FOR_EACH_SAFE(...)                                               \
    OVERLOAD_SAFE_MACRO(SMAP_FOR_EACH_SAFE_LONG,                              \
                        SMAP_FOR_EACH_SAFE_SHORT,                             \
                        3, __VA_ARGS__)

/* Initializer for an immutable struct smap 'SMAP' that contains one or two
 * key-value pairs, e.g.
 *
 *     const struct smap smap1 = SMAP_CONST1(&smap, "key", "value");
 *     const struct smap smap2 = SMAP_CONST2(&smap, "key1", "value1",
 *                                           "key2", "value2");
 *
 * An smap initialized this way must not be modified or destroyed.
 *
 * The 'KEY', 'K1', 'K2' arguments are evaluated multiple times.
 */
#define SMAP_CONST1(SMAP, KEY, VALUE) (const struct smap) { \
            HMAP_CONST(&(SMAP)->map, 1, SMAP_NODE(KEY, VALUE, NULL)) \
        }
#define SMAP_CONST2(SMAP, K1, V1, K2, V2) (const struct smap) {     \
            HMAP_CONST(&(SMAP)->map, 2,                             \
                       SMAP_NODE(K1, V1, SMAP_NODE(K2, V2, NULL)))  \
        }
#define SMAP_NODE(KEY, VALUE, NEXT)             \
        &(struct smap_node) {                   \
            .node = {                           \
                .hash = hash_string(KEY, 0),    \
                .next = (NEXT),                 \
            },                                  \
            .key = CONST_CAST(char *, KEY),     \
            .value = CONST_CAST(char *, VALUE), \
        }.node


void smap_init(struct smap *);
void smap_destroy(struct smap *);

struct smap_node *smap_add(struct smap *, const char *, const char *);
struct smap_node *smap_add_nocopy(struct smap *, char *, char *);
bool smap_add_once(struct smap *, const char *, const char *);
void smap_add_format(struct smap *, const char *key, const char *, ...)
    OVS_PRINTF_FORMAT(3, 4);
void smap_add_ipv6(struct smap *, const char *, struct in6_addr *);
void smap_replace(struct smap *, const char *, const char *);
void smap_replace_nocopy(struct smap *, const char *, char *);

void smap_remove(struct smap *, const char *);
void smap_remove_node(struct smap *, struct smap_node *);
void smap_steal(struct smap *, struct smap_node *, char **keyp, char **valuep);
void smap_clear(struct smap *);

const char *smap_get(const struct smap *, const char *key);
const char *smap_get_def(const struct smap *, const char *key,
                         const char *def);
struct smap_node *smap_get_node(const struct smap *, const char *);
bool smap_get_bool(const struct smap *smap, const char *key, bool def);
int smap_get_int(const struct smap *smap, const char *key, int def);
unsigned int smap_get_uint(const struct smap *smap, const char *key,
                           unsigned int def);
unsigned long long int smap_get_ullong(const struct smap *, const char *key,
                                       unsigned long long def);
bool smap_get_uuid(const struct smap *, const char *key, struct uuid *);

bool smap_is_empty(const struct smap *);
size_t smap_count(const struct smap *);

void smap_clone(struct smap *dst, const struct smap *src);
const struct smap_node **smap_sort(const struct smap *);

void smap_from_json(struct smap *, const struct json *);
struct json *smap_to_json(const struct smap *);

bool smap_equal(const struct smap *, const struct smap *);

#ifdef __cplusplus
}
#endif

#endif /* smap.h */