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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2013 Intel Corporation.
* Copyright(c) 2014 6WIND S.A.
*/
#include <string.h>
#include <stdlib.h>
#include <rte_string_fns.h>
#include "rte_kvargs.h"
/*
* Receive a string with a list of arguments following the pattern
* key=value,key=value,... and insert them into the list.
* strtok() is used so the params string will be copied to be modified.
*/
static int
rte_kvargs_tokenize(struct rte_kvargs *kvlist, const char *params)
{
unsigned i;
char *str;
char *ctx1 = NULL;
char *ctx2 = NULL;
/* Copy the const char *params to a modifiable string
* to pass to rte_strsplit
*/
kvlist->str = strdup(params);
if (kvlist->str == NULL)
return -1;
/* browse each key/value pair and add it in kvlist */
str = kvlist->str;
while ((str = strtok_r(str, RTE_KVARGS_PAIRS_DELIM, &ctx1)) != NULL) {
i = kvlist->count;
if (i >= RTE_KVARGS_MAX)
return -1;
kvlist->pairs[i].key = strtok_r(str, RTE_KVARGS_KV_DELIM, &ctx2);
kvlist->pairs[i].value = strtok_r(NULL, RTE_KVARGS_KV_DELIM, &ctx2);
if (kvlist->pairs[i].key == NULL ||
kvlist->pairs[i].value == NULL)
return -1;
/* Detect list [a,b] to skip comma delimiter in list. */
str = kvlist->pairs[i].value;
if (str[0] == '[') {
/* Find the end of the list. */
while (str[strlen(str) - 1] != ']') {
/* Restore the comma erased by strtok_r(). */
str[strlen(str)] = ',';
/* Parse until next comma. */
str = strtok_r(NULL, RTE_KVARGS_PAIRS_DELIM, &ctx1);
if (str == NULL)
return -1; /* no closing bracket */
}
}
kvlist->count++;
str = NULL;
}
return 0;
}
/*
* Determine whether a key is valid or not by looking
* into a list of valid keys.
*/
static int
is_valid_key(const char * const valid[], const char *key_match)
{
const char * const *valid_ptr;
for (valid_ptr = valid; *valid_ptr != NULL; valid_ptr++) {
if (strcmp(key_match, *valid_ptr) == 0)
return 1;
}
return 0;
}
/*
* Determine whether all keys are valid or not by looking
* into a list of valid keys.
*/
static int
check_for_valid_keys(struct rte_kvargs *kvlist,
const char * const valid[])
{
unsigned i, ret;
struct rte_kvargs_pair *pair;
for (i = 0; i < kvlist->count; i++) {
pair = &kvlist->pairs[i];
ret = is_valid_key(valid, pair->key);
if (!ret)
return -1;
}
return 0;
}
/*
* Return the number of times a given arg_name exists in the key/value list.
* E.g. given a list = { rx = 0, rx = 1, tx = 2 } the number of args for
* arg "rx" will be 2.
*/
unsigned
rte_kvargs_count(const struct rte_kvargs *kvlist, const char *key_match)
{
const struct rte_kvargs_pair *pair;
unsigned i, ret;
ret = 0;
for (i = 0; i < kvlist->count; i++) {
pair = &kvlist->pairs[i];
if (key_match == NULL || strcmp(pair->key, key_match) == 0)
ret++;
}
return ret;
}
/*
* For each matching key, call the given handler function.
*/
int
rte_kvargs_process(const struct rte_kvargs *kvlist,
const char *key_match,
arg_handler_t handler,
void *opaque_arg)
{
const struct rte_kvargs_pair *pair;
unsigned i;
if (kvlist == NULL)
return 0;
for (i = 0; i < kvlist->count; i++) {
pair = &kvlist->pairs[i];
if (key_match == NULL || strcmp(pair->key, key_match) == 0) {
if ((*handler)(pair->key, pair->value, opaque_arg) < 0)
return -1;
}
}
return 0;
}
/* free the rte_kvargs structure */
void
rte_kvargs_free(struct rte_kvargs *kvlist)
{
if (!kvlist)
return;
free(kvlist->str);
free(kvlist);
}
/*
* Parse the arguments "key=value,key=value,..." string and return
* an allocated structure that contains a key/value list. Also
* check if only valid keys were used.
*/
struct rte_kvargs *
rte_kvargs_parse(const char *args, const char * const valid_keys[])
{
struct rte_kvargs *kvlist;
kvlist = malloc(sizeof(*kvlist));
if (kvlist == NULL)
return NULL;
memset(kvlist, 0, sizeof(*kvlist));
if (rte_kvargs_tokenize(kvlist, args) < 0) {
rte_kvargs_free(kvlist);
return NULL;
}
if (valid_keys != NULL && check_for_valid_keys(kvlist, valid_keys) < 0) {
rte_kvargs_free(kvlist);
return NULL;
}
return kvlist;
}
__rte_experimental
struct rte_kvargs *
rte_kvargs_parse_delim(const char *args, const char * const valid_keys[],
const char *valid_ends)
{
struct rte_kvargs *kvlist = NULL;
char *copy;
size_t len;
if (valid_ends == NULL)
return rte_kvargs_parse(args, valid_keys);
copy = strdup(args);
if (copy == NULL)
return NULL;
len = strcspn(copy, valid_ends);
copy[len] = '\0';
kvlist = rte_kvargs_parse(copy, valid_keys);
free(copy);
return kvlist;
}
__rte_experimental
int
rte_kvargs_strcmp(const char *key __rte_unused,
const char *value, void *opaque)
{
const char *str = opaque;
return -abs(strcmp(str, value));
}
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