1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
/*
* Copyright Jan Engelhardt, 2012
*
* This file is part of libHX. libHX is free software; you can
* redistribute it and/or modify it under the terms of the GNU Lesser
* General Public License as published by the Free Software Foundation;
* either version 2.1 or (at your option) any later version.
*/
#include <sys/stat.h>
#include <sys/time.h>
#include <stdbool.h>
#include <time.h>
#include <libHX/misc.h>
#include "internal.h"
#define MICROSECOND 100000
#define NANOSECOND 1000000000
#define NANOSECOND_LL 1000000000LL
#ifdef HAVE_STRUCT_TIMESPEC_TV_NSEC
EXPORT_SYMBOL bool HX_timespec_isneg(const struct timespec *x)
{
return (x->tv_sec < 0) || (x->tv_nsec < 0);
}
EXPORT_SYMBOL struct timespec *
HX_timespec_neg(struct timespec *r, const struct timespec *a)
{
if (a->tv_sec != 0) {
r->tv_sec = -a->tv_sec;
r->tv_nsec = a->tv_nsec;
} else {
r->tv_sec = 0;
r->tv_nsec = -a->tv_nsec;
}
return r;
}
EXPORT_SYMBOL struct timespec *HX_timespec_add(struct timespec *r,
const struct timespec *a, const struct timespec *b)
{
/*
* Split the value represented by the struct into two
* independent values that can be added individually.
*/
long nsec[2];
nsec[0] = (a->tv_sec < 0) ? -a->tv_nsec : a->tv_nsec;
nsec[1] = (b->tv_sec < 0) ? -b->tv_nsec : b->tv_nsec;
r->tv_sec = a->tv_sec + b->tv_sec;
r->tv_nsec = nsec[0] + nsec[1];
if (r->tv_nsec >= NANOSECOND) {
++r->tv_sec;
r->tv_nsec -= NANOSECOND;
} else if (r->tv_nsec <= -NANOSECOND) {
--r->tv_sec;
r->tv_nsec += NANOSECOND;
}
/* Combine again */
if (r->tv_sec < 0) {
if (r->tv_nsec < 0) {
r->tv_nsec = -r->tv_nsec;
} else if (r->tv_nsec > 0) {
if (++r->tv_sec == 0)
r->tv_nsec = -NANOSECOND + r->tv_nsec;
else
r->tv_nsec = NANOSECOND - r->tv_nsec;
}
} else if (r->tv_sec > 0 && r->tv_nsec < 0) {
--r->tv_sec;
r->tv_nsec = NANOSECOND + r->tv_nsec;
}
return r;
}
EXPORT_SYMBOL struct timespec *HX_timespec_sub(struct timespec *r,
const struct timespec *a, const struct timespec *b)
{
struct timespec b2;
return HX_timespec_add(r, a, HX_timespec_neg(&b2, b));
}
EXPORT_SYMBOL void HX_diff_timespec(struct timespec *delta,
const struct timespec *future, const struct timespec *past)
{
HX_timespec_sub(delta, future, past);
}
EXPORT_SYMBOL struct timespec *
HX_timespec_mul(struct timespec *r, const struct timespec *a, int f)
{
long long t;
t = a->tv_sec * NANOSECOND_LL +
((a->tv_sec >= 0) ? a->tv_nsec : -a->tv_nsec);
t *= f;
r->tv_sec = t / NANOSECOND;
r->tv_nsec = t % NANOSECOND;
if (r->tv_sec < 0 && r->tv_nsec < 0)
r->tv_nsec = -r->tv_nsec;
return r;
}
EXPORT_SYMBOL struct timespec *
HX_timespec_mulf(struct timespec *r, const struct timespec *a, double f)
{
double t;
t = (a->tv_sec * NANOSECOND_LL +
((a->tv_sec >= 0) ? a->tv_nsec : -a->tv_nsec)) * f;
r->tv_sec = t / NANOSECOND;
/*
* This is quite the same as r->tv_nsec = fmod(t, NANOSECOND),
* except that without the library call, we are faster.
*/
r->tv_nsec = t - r->tv_sec * NANOSECOND_LL;
if (r->tv_sec < 0 && r->tv_nsec < 0)
r->tv_nsec = -r->tv_nsec;
return r;
}
#endif
#ifdef HAVE_STRUCT_TIMEVAL_TV_USEC
EXPORT_SYMBOL struct timeval *HX_timeval_sub(struct timeval *delta,
const struct timeval *future, const struct timeval *past)
{
delta->tv_sec = future->tv_sec - past->tv_sec;
delta->tv_usec = future->tv_usec - past->tv_usec;
if (future->tv_sec < past->tv_sec || (future->tv_sec == past->tv_sec &&
future->tv_usec < past->tv_usec)) {
if (future->tv_usec > past->tv_usec) {
delta->tv_usec = -MICROSECOND + delta->tv_usec;
++delta->tv_sec;
}
if (delta->tv_sec < 0)
delta->tv_usec *= -1;
} else if (delta->tv_usec < 0) {
delta->tv_usec += MICROSECOND;
--delta->tv_sec;
}
return delta;
}
EXPORT_SYMBOL void HX_diff_timeval(struct timeval *delta,
const struct timeval *future, const struct timeval *past)
{
HX_timeval_sub(delta, future, past);
}
#endif
EXPORT_SYMBOL long HX_time_compare(const struct stat *a,
const struct stat *b, char sel)
{
long r;
#if defined(HAVE_STRUCT_STAT_ST_MTIMENSEC)
if (sel == 'm')
return ((r = a->st_mtime - b->st_mtime) != 0) ?
r : a->st_mtimensec - b->st_mtimensec;
#ifdef HAVE_STRUCT_STAT_ST_OTIMENSEC
else if (sel == 'o')
return ((r = a->st_otime - b->st_otime) != 0) ?
r : a->st_otimensec - b->st_otimensec;
#endif
else if (sel == 'a')
return ((r = a->st_atime - b->st_atime) != 0) ?
r : a->st_atimensec - b->st_atimensec;
else if (sel == 'c')
return ((r = a->st_ctime - b->st_ctime) != 0) ?
r : a->st_ctimensec - b->st_ctimensec;
#elif defined(HAVE_STRUCT_STAT_ST_MTIM)
if (sel == 'm')
return ((r = a->st_mtim.tv_sec - b->st_mtim.tv_sec) != 0) ?
r : a->st_mtim.tv_nsec - b->st_mtim.tv_nsec;
#ifdef HAVE_STRUCT_STAT_ST_OTIM
else if (sel == 'o')
return ((r = a->st_otim.tv_sec - b->st_otim.tv_sec) != 0) ?
r : a->st_otim.tv_nsec - b->st_otim.tv_nsec;
#endif
else if (sel == 'a')
return ((r = a->st_atim.tv_sec - b->st_atim.tv_sec) != 0) ?
r : a->st_atim.tv_nsec - b->st_atim.tv_nsec;
else if (sel == 'c')
return ((r = a->st_ctim.tv_sec - b->st_ctim.tv_sec) != 0) ?
r : a->st_ctim.tv_nsec - b->st_ctim.tv_nsec;
#elif defined(HAVE_STRUCT_STAT_ST_MTIMESPEC)
if (sel == 'm')
return ((r = a->st_mtimespec.tv_sec - b->st_mtimespec.tv_sec) != 0) ?
r : a->st_mtimespec.tv_nsec - b->st_mtimespec.tv_nsec;
#ifdef HAVE_STRUCT_STAT_ST_OTIMESPEC
else if (sel == 'o')
return ((r = a->st_otimespec.tv_sec - b->st_otimespec.tv_sec) != 0) ?
r : a->st_otimespec.tv_nsec - b->st_otimespec.tv_nsec;
#endif
else if (sel == 'a')
return ((r = a->st_atimespec.tv_sec - b->st_atimespec.tv_sec) != 0) ?
r : a->st_atimespec.tv_nsec - b->st_atimespec.tv_nsec;
else if (sel == 'c')
return ((r = a->st_ctimespec.tv_sec - b->st_ctimespec.tv_sec) != 0) ?
r : a->st_ctimespec.tv_nsec - b->st_ctimespec.tv_nsec;
#elif defined(HAVE_STRUCT_STAT_ST_MTIME)
if (sel == 'm')
return a->st_mtime - b->st_mtime;
#ifdef HAVE_STRUCT_STAT_ST_OTIME
else if (sel == 'o')
return a->st_otime - b->st_otime;
#endif
else if (sel == 'a')
return a->st_atime - b->st_atime;
else if (sel == 'c')
return a->st_ctime - b->st_ctime;
#else
# error Tis not ending well.
#endif
return 0;
}
|
