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/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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.
*/
#include <errno.h>
#include <string.h>
#include <log/log.h>
#include <log/logger.h>
#define MAX_EVENT_PAYLOAD 512
#define MAX_SUBTAG_LEN 32
static inline void copy4LE(uint8_t *buf, size_t pos, int val)
{
buf[pos] = val & 0xFF;
buf[pos+1] = (val >> 8) & 0xFF;
buf[pos+2] = (val >> 16) & 0xFF;
buf[pos+3] = (val >> 24) & 0xFF;
}
int __android_log_error_write(int tag, const char *subTag, int32_t uid, const char *data,
uint32_t dataLen)
{
uint8_t buf[MAX_EVENT_PAYLOAD];
size_t pos = 0;
uint32_t subTagLen = 0;
uint32_t roomLeftForData = 0;
if ((subTag == NULL) || ((data == NULL) && (dataLen != 0))) return -EINVAL;
subTagLen = strlen(subTag);
// Truncate subtags that are too long.
subTagLen = subTagLen > MAX_SUBTAG_LEN ? MAX_SUBTAG_LEN : subTagLen;
// Truncate dataLen if it is too long.
roomLeftForData = MAX_EVENT_PAYLOAD -
(1 + // EVENT_TYPE_LIST
1 + // Number of elements in list
1 + // EVENT_TYPE_STRING
sizeof(subTagLen) +
subTagLen +
1 + // EVENT_TYPE_INT
sizeof(uid) +
1 + // EVENT_TYPE_STRING
sizeof(dataLen));
dataLen = dataLen > roomLeftForData ? roomLeftForData : dataLen;
buf[pos++] = EVENT_TYPE_LIST;
buf[pos++] = 3; // Number of elements in the list (subTag, uid, data)
// Write sub tag.
buf[pos++] = EVENT_TYPE_STRING;
copy4LE(buf, pos, subTagLen);
pos += 4;
memcpy(&buf[pos], subTag, subTagLen);
pos += subTagLen;
// Write UID.
buf[pos++] = EVENT_TYPE_INT;
copy4LE(buf, pos, uid);
pos += 4;
// Write data.
buf[pos++] = EVENT_TYPE_STRING;
copy4LE(buf, pos, dataLen);
pos += 4;
if (dataLen != 0)
{
memcpy(&buf[pos], data, dataLen);
pos += dataLen;
}
return __android_log_bwrite(tag, buf, pos);
}
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