1/*
2 * Copyright (C) 2013-2014 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#ifndef _LIBS_LOG_LOG_READ_H
18#define _LIBS_LOG_LOG_READ_H
19
20#include <stdint.h>
21#include <time.h>
22
23/* struct log_time is a wire-format variant of struct timespec */
24#define NS_PER_SEC 1000000000ULL
25
26#ifdef __cplusplus
27
28// NB: do NOT define a copy constructor. This will result in structure
29// no longer being compatible with pass-by-value which is desired
30// efficient behavior. Also, pass-by-reference breaks C/C++ ABI.
31struct log_time {
32public:
33    uint32_t tv_sec; // good to Feb 5 2106
34    uint32_t tv_nsec;
35
36    static const uint32_t tv_sec_max = 0xFFFFFFFFUL;
37    static const uint32_t tv_nsec_max = 999999999UL;
38
39    log_time(const timespec &T)
40    {
41        tv_sec = T.tv_sec;
42        tv_nsec = T.tv_nsec;
43    }
44    log_time(uint32_t sec, uint32_t nsec)
45    {
46        tv_sec = sec;
47        tv_nsec = nsec;
48    }
49    static const timespec EPOCH;
50    log_time()
51    {
52    }
53    log_time(clockid_t id)
54    {
55        timespec T;
56        clock_gettime(id, &T);
57        tv_sec = T.tv_sec;
58        tv_nsec = T.tv_nsec;
59    }
60    log_time(const char *T)
61    {
62        const uint8_t *c = (const uint8_t *) T;
63        tv_sec = c[0] | (c[1] << 8) | (c[2] << 16) | (c[3] << 24);
64        tv_nsec = c[4] | (c[5] << 8) | (c[6] << 16) | (c[7] << 24);
65    }
66
67    // timespec
68    bool operator== (const timespec &T) const
69    {
70        return (tv_sec == static_cast<uint32_t>(T.tv_sec))
71            && (tv_nsec == static_cast<uint32_t>(T.tv_nsec));
72    }
73    bool operator!= (const timespec &T) const
74    {
75        return !(*this == T);
76    }
77    bool operator< (const timespec &T) const
78    {
79        return (tv_sec < static_cast<uint32_t>(T.tv_sec))
80            || ((tv_sec == static_cast<uint32_t>(T.tv_sec))
81                && (tv_nsec < static_cast<uint32_t>(T.tv_nsec)));
82    }
83    bool operator>= (const timespec &T) const
84    {
85        return !(*this < T);
86    }
87    bool operator> (const timespec &T) const
88    {
89        return (tv_sec > static_cast<uint32_t>(T.tv_sec))
90            || ((tv_sec == static_cast<uint32_t>(T.tv_sec))
91                && (tv_nsec > static_cast<uint32_t>(T.tv_nsec)));
92    }
93    bool operator<= (const timespec &T) const
94    {
95        return !(*this > T);
96    }
97    log_time operator-= (const timespec &T);
98    log_time operator- (const timespec &T) const
99    {
100        log_time local(*this);
101        return local -= T;
102    }
103
104    // log_time
105    bool operator== (const log_time &T) const
106    {
107        return (tv_sec == T.tv_sec) && (tv_nsec == T.tv_nsec);
108    }
109    bool operator!= (const log_time &T) const
110    {
111        return !(*this == T);
112    }
113    bool operator< (const log_time &T) const
114    {
115        return (tv_sec < T.tv_sec)
116            || ((tv_sec == T.tv_sec) && (tv_nsec < T.tv_nsec));
117    }
118    bool operator>= (const log_time &T) const
119    {
120        return !(*this < T);
121    }
122    bool operator> (const log_time &T) const
123    {
124        return (tv_sec > T.tv_sec)
125            || ((tv_sec == T.tv_sec) && (tv_nsec > T.tv_nsec));
126    }
127    bool operator<= (const log_time &T) const
128    {
129        return !(*this > T);
130    }
131    log_time operator-= (const log_time &T);
132    log_time operator- (const log_time &T) const
133    {
134        log_time local(*this);
135        return local -= T;
136    }
137
138    uint64_t nsec() const
139    {
140        return static_cast<uint64_t>(tv_sec) * NS_PER_SEC + tv_nsec;
141    }
142
143    static const char default_format[];
144
145    // Add %#q for the fraction of a second to the standard library functions
146    char *strptime(const char *s, const char *format = default_format);
147} __attribute__((__packed__));
148
149#else
150
151typedef struct log_time {
152    uint32_t tv_sec;
153    uint32_t tv_nsec;
154} __attribute__((__packed__)) log_time;
155
156#endif
157
158#endif /* define _LIBS_LOG_LOG_READ_H */
159