89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <string.h>
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#include <log/log.h>
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#include <log/logger.h>
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#define MAX_EVENT_PAYLOAD 512
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#define MAX_SUBTAG_LEN 32
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static inline void copy4LE(uint8_t *buf, size_t pos, int val)
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{
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buf[pos] = val & 0xFF;
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buf[pos+1] = (val >> 8) & 0xFF;
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buf[pos+2] = (val >> 16) & 0xFF;
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buf[pos+3] = (val >> 24) & 0xFF;
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}
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int __android_log_error_write(int tag, const char *subTag, int32_t uid, const char *data,
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uint32_t dataLen)
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{
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uint8_t buf[MAX_EVENT_PAYLOAD];
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size_t pos = 0;
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uint32_t subTagLen = 0;
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uint32_t roomLeftForData = 0;
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if ((subTag == NULL) || ((data == NULL) && (dataLen != 0))) return -EINVAL;
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subTagLen = strlen(subTag);
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// Truncate subtags that are too long.
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subTagLen = subTagLen > MAX_SUBTAG_LEN ? MAX_SUBTAG_LEN : subTagLen;
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// Truncate dataLen if it is too long.
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roomLeftForData = MAX_EVENT_PAYLOAD -
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(1 + // EVENT_TYPE_LIST
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1 + // Number of elements in list
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1 + // EVENT_TYPE_STRING
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sizeof(subTagLen) +
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subTagLen +
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1 + // EVENT_TYPE_INT
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sizeof(uid) +
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1 + // EVENT_TYPE_STRING
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sizeof(dataLen));
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dataLen = dataLen > roomLeftForData ? roomLeftForData : dataLen;
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buf[pos++] = EVENT_TYPE_LIST;
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buf[pos++] = 3; // Number of elements in the list (subTag, uid, data)
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// Write sub tag.
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buf[pos++] = EVENT_TYPE_STRING;
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copy4LE(buf, pos, subTagLen);
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pos += 4;
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memcpy(&buf[pos], subTag, subTagLen);
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pos += subTagLen;
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// Write UID.
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buf[pos++] = EVENT_TYPE_INT;
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copy4LE(buf, pos, uid);
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pos += 4;
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// Write data.
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buf[pos++] = EVENT_TYPE_STRING;
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copy4LE(buf, pos, dataLen);
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pos += 4;
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if (dataLen != 0)
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{
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memcpy(&buf[pos], data, dataLen);
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pos += dataLen;
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}
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return __android_log_bwrite(tag, buf, pos);
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}
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