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/**
* @brief SNMP OID manipulation helper.
*
* This file is part of sila-snmp project.
*
* Copyright (c) 2022 SILA
*
* 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.
*
*/
#pragma once
#include <net-snmp/net-snmp-includes.h>
#include <vector>
#include <cstdarg>
namespace phosphor
{
namespace snmp
{
namespace agent
{
using OID = std::vector<oid>;
/**
* @brief Parse OID present as string
*
* @param oid_value - Container for parsed oid
* @param fmt - Format string for oid presence
* @param ... - Additional args for oid string
*/
inline void make_oid(OID& oid_value, const char* fmt, ...)
{
va_list ap;
std::vector<char> oid_str;
// Calculate required size of oid_strfer
va_start(ap, fmt);
int n = vsnprintf(nullptr, 0, fmt, ap);
va_end(ap);
if (n > 0)
{
oid_str.resize(n + 1); // for terminating '\0'
// Create string oid
va_start(ap, fmt);
n = vsnprintf(oid_str.data(), oid_str.size(), fmt, ap);
va_end(ap);
}
if (n < 0)
{
oid_str.clear();
}
// Parse oid string
size_t oid_len = MAX_OID_LEN;
oid_value.resize(oid_len);
if (read_objid(oid_str.data(), oid_value.data(), &oid_len))
{
oid_value.resize(oid_len);
}
else
{
oid_value.clear();
}
}
} // namespace agent
} // namespace snmp
} // namespace phosphor
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