libressl_d.compat.time source code

1 /*
2  * Public domain
3  * sys/time.h compatibility shim
4  */
5 module libressl_d.compat.time;
6 
7 
8 public import core.stdc.time;
9 public import core.sys.posix.time;
10 public import libressl_d.compat.sys.time;
11 
12 extern (C):
13 nothrow @nogc:
14 
15 version (Windows) {
16 	core.stdc.time.tm* __gmtime_r(const (core.stdc.time.time_t)* t, core.stdc.time.tm* tm);
17 	alias gmtime_r = .__gmtime_r;
18 }
19 
20 static if (!__traits(compiles, timegm)) {
21 	core.stdc.time.time_t timegm(core.stdc.time.tm* tm);
22 }
23 
24 static if (!__traits(compiles, CLOCK_REALTIME)) {
25 	enum CLOCK_REALTIME = 0;
26 }
27 
28 static if (!__traits(compiles, CLOCK_MONOTONIC)) {
29 	alias CLOCK_MONOTONIC = .CLOCK_REALTIME;
30 }
31 
32 version (Posix) {
33 	static if (!__traits(compiles, clock_gettime)) {
34 		alias clockid_t = int;
35 		int clock_gettime(.clockid_t clock_id, libressl_d.compat.sys.time.timespec* tp);
36 	}
37 
38 	//#if defined(timespecsub)
39 		//version = HAVE_TIMESPECSUB;
40 	//#endif
41 
42 	//#if !defined(HAVE_TIMESPECSUB)
43 	static if (!__traits(compiles, timespecsub)) {
44 		pragma(inline, true)
45 		pure nothrow @trusted @nogc @live
46 		void timespecsub(scope const libressl_d.compat.sys.time.timespec* tsp, scope const libressl_d.compat.sys.time.timespec* usp, scope libressl_d.compat.sys.time.timespec* vsp)
47 
48 			in
49 			{
50 				assert(tsp != null);
51 				assert(usp != null);
52 				assert(vsp != null);
53 			}
54 
55 			do
56 			{
57 				vsp.tv_sec = tsp.tv_sec - usp.tv_sec;
58 				vsp.tv_nsec = tsp.tv_nsec - usp.tv_nsec;
59 
60 				if (vsp.tv_nsec < 0) {
61 					vsp.tv_sec--;
62 					vsp.tv_nsec += 1000000000L;
63 				}
64 			}
65 	}
66 }