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/*-
* BSD LICENSE
*
* Copyright(c) 2010-2013 Intel Corporation. All rights reserved.
* Copyright(c) 2014 6WIND S.A.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <string.h>
#include <stdlib.h>
#include <rte_log.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) {
RTE_LOG(ERR, PMD, "Cannot parse arguments: not enough memory\n");
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) {
RTE_LOG(ERR, PMD, "Cannot parse arguments: list full\n");
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) {
RTE_LOG(ERR, PMD,
"Cannot parse arguments: wrong key or value\n"
"params=<%s>\n", params);
return -1;
}
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) {
RTE_LOG(ERR, PMD,
"Error parsing device, invalid key <%s>\n",
pair->key);
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;
}
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