William Luh | fb376ce | 2015-08-13 10:41:58 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2015 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <errno.h> |
| 18 | #include <string.h> |
| 19 | |
| 20 | #include <log/log.h> |
| 21 | #include <log/logger.h> |
| 22 | |
| 23 | #define MAX_EVENT_PAYLOAD 512 |
| 24 | #define MAX_SUBTAG_LEN 32 |
| 25 | |
| 26 | static inline void copy4LE(uint8_t *buf, size_t pos, int val) |
| 27 | { |
| 28 | buf[pos] = val & 0xFF; |
| 29 | buf[pos+1] = (val >> 8) & 0xFF; |
| 30 | buf[pos+2] = (val >> 16) & 0xFF; |
| 31 | buf[pos+3] = (val >> 24) & 0xFF; |
| 32 | } |
| 33 | |
| 34 | int __android_log_error_write(int tag, const char *subTag, int32_t uid, const char *data, |
| 35 | uint32_t dataLen) |
| 36 | { |
| 37 | uint8_t buf[MAX_EVENT_PAYLOAD]; |
| 38 | size_t pos = 0; |
| 39 | uint32_t subTagLen = 0; |
| 40 | uint32_t roomLeftForData = 0; |
| 41 | |
| 42 | if ((subTag == NULL) || ((data == NULL) && (dataLen != 0))) return -EINVAL; |
| 43 | |
| 44 | subTagLen = strlen(subTag); |
| 45 | |
| 46 | // Truncate subtags that are too long. |
| 47 | subTagLen = subTagLen > MAX_SUBTAG_LEN ? MAX_SUBTAG_LEN : subTagLen; |
| 48 | |
| 49 | // Truncate dataLen if it is too long. |
| 50 | roomLeftForData = MAX_EVENT_PAYLOAD - |
| 51 | (1 + // EVENT_TYPE_LIST |
| 52 | 1 + // Number of elements in list |
| 53 | 1 + // EVENT_TYPE_STRING |
| 54 | sizeof(subTagLen) + |
| 55 | subTagLen + |
| 56 | 1 + // EVENT_TYPE_INT |
| 57 | sizeof(uid) + |
| 58 | 1 + // EVENT_TYPE_STRING |
| 59 | sizeof(dataLen)); |
| 60 | dataLen = dataLen > roomLeftForData ? roomLeftForData : dataLen; |
| 61 | |
| 62 | buf[pos++] = EVENT_TYPE_LIST; |
| 63 | buf[pos++] = 3; // Number of elements in the list (subTag, uid, data) |
| 64 | |
| 65 | // Write sub tag. |
| 66 | buf[pos++] = EVENT_TYPE_STRING; |
| 67 | copy4LE(buf, pos, subTagLen); |
| 68 | pos += 4; |
| 69 | memcpy(&buf[pos], subTag, subTagLen); |
| 70 | pos += subTagLen; |
| 71 | |
| 72 | // Write UID. |
| 73 | buf[pos++] = EVENT_TYPE_INT; |
| 74 | copy4LE(buf, pos, uid); |
| 75 | pos += 4; |
| 76 | |
| 77 | // Write data. |
| 78 | buf[pos++] = EVENT_TYPE_STRING; |
| 79 | copy4LE(buf, pos, dataLen); |
| 80 | pos += 4; |
| 81 | if (dataLen != 0) |
| 82 | { |
| 83 | memcpy(&buf[pos], data, dataLen); |
| 84 | pos += dataLen; |
| 85 | } |
| 86 | |
| 87 | return __android_log_bwrite(tag, buf, pos); |
| 88 | } |