1/*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20*/
21#include "SDL_internal.h"
22
23#ifdef SDL_TIME_UNIX
24
25#include "../SDL_time_c.h"
26#include <errno.h>
27#include <langinfo.h>
28#include <sys/time.h>
29#include <time.h>
30
31#if !defined(HAVE_CLOCK_GETTIME) && defined(SDL_PLATFORM_APPLE)
32#include <mach/clock.h>
33#include <mach/mach.h>
34#include <mach/mach_time.h>
35#endif
36
37void SDL_GetSystemTimeLocalePreferences(SDL_DateFormat *df, SDL_TimeFormat *tf)
38{
39 /* This *should* be well-supported aside from very old legacy systems, but apparently
40 * Android didn't add this until SDK version 26, so a check is needed...
41 */
42#ifdef HAVE_NL_LANGINFO
43 if (df) {
44 const char *s = nl_langinfo(D_FMT);
45
46 // Figure out the preferred system date format from the first format character.
47 if (s) {
48 while (*s) {
49 switch (*s++) {
50 case 'Y':
51 case 'y':
52 case 'F':
53 case 'C':
54 *df = SDL_DATE_FORMAT_YYYYMMDD;
55 goto found_date;
56 case 'd':
57 case 'e':
58 *df = SDL_DATE_FORMAT_DDMMYYYY;
59 goto found_date;
60 case 'b':
61 case 'D':
62 case 'h':
63 case 'm':
64 *df = SDL_DATE_FORMAT_MMDDYYYY;
65 goto found_date;
66 default:
67 break;
68 }
69 }
70 }
71 }
72
73found_date:
74
75 if (tf) {
76 const char *s = nl_langinfo(T_FMT);
77
78 // Figure out the preferred system date format.
79 if (s) {
80 while (*s) {
81 switch (*s++) {
82 case 'H':
83 case 'k':
84 case 'T':
85 *tf = SDL_TIME_FORMAT_24HR;
86 return;
87 case 'I':
88 case 'l':
89 case 'r':
90 *tf = SDL_TIME_FORMAT_12HR;
91 return;
92 default:
93 break;
94 }
95 }
96 }
97 }
98#endif
99}
100
101bool SDL_GetCurrentTime(SDL_Time *ticks)
102{
103 if (!ticks) {
104 return SDL_InvalidParamError("ticks");
105 }
106#ifdef HAVE_CLOCK_GETTIME
107 struct timespec tp;
108
109 if (clock_gettime(CLOCK_REALTIME, &tp) == 0) {
110 //tp.tv_sec = SDL_min(tp.tv_sec, SDL_NS_TO_SECONDS(SDL_MAX_TIME) - 1);
111 *ticks = SDL_SECONDS_TO_NS(tp.tv_sec) + tp.tv_nsec;
112 return true;
113 }
114
115 SDL_SetError("Failed to retrieve system time (%i)", errno);
116
117#elif defined(SDL_PLATFORM_APPLE)
118 clock_serv_t cclock;
119 int ret = host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock);
120 if (ret == 0) {
121 mach_timespec_t mts;
122
123 SDL_zero(mts);
124 ret = clock_get_time(cclock, &mts);
125 if (ret == 0) {
126 // mach_timespec_t tv_sec is 32-bit, so no overflow possible
127 *ticks = SDL_SECONDS_TO_NS(mts.tv_sec) + mts.tv_nsec;
128 }
129 mach_port_deallocate(mach_task_self(), cclock);
130
131 if (!ret) {
132 return true;
133 }
134 }
135
136 SDL_SetError("Failed to retrieve system time (%i)", ret);
137
138#else
139 struct timeval tv;
140 SDL_zero(tv);
141 if (gettimeofday(&tv, NULL) == 0) {
142 tv.tv_sec = SDL_min(tv.tv_sec, SDL_NS_TO_SECONDS(SDL_MAX_TIME) - 1);
143 *ticks = SDL_SECONDS_TO_NS(tv.tv_sec) + SDL_US_TO_NS(tv.tv_usec);
144 return true;
145 }
146
147 SDL_SetError("Failed to retrieve system time (%i)", errno);
148#endif
149
150 return false;
151}
152
153bool SDL_TimeToDateTime(SDL_Time ticks, SDL_DateTime *dt, bool localTime)
154{
155#if defined (HAVE_GMTIME_R) || defined(HAVE_LOCALTIME_R)
156 struct tm tm_storage;
157#endif
158 struct tm *tm = NULL;
159
160 if (!dt) {
161 return SDL_InvalidParamError("dt");
162 }
163
164 const time_t tval = (time_t)SDL_NS_TO_SECONDS(ticks);
165
166 if (localTime) {
167#ifdef HAVE_LOCALTIME_R
168 tm = localtime_r(&tval, &tm_storage);
169#else
170 tm = localtime(&tval);
171#endif
172 } else {
173#ifdef HAVE_GMTIME_R
174 tm = gmtime_r(&tval, &tm_storage);
175#else
176 tm = gmtime(&tval);
177#endif
178 }
179
180 if (tm) {
181 dt->year = tm->tm_year + 1900;
182 dt->month = tm->tm_mon + 1;
183 dt->day = tm->tm_mday;
184 dt->hour = tm->tm_hour;
185 dt->minute = tm->tm_min;
186 dt->second = tm->tm_sec;
187 dt->nanosecond = ticks % SDL_NS_PER_SECOND;
188 dt->day_of_week = tm->tm_wday;
189 dt->utc_offset = (int)tm->tm_gmtoff;
190
191 return true;
192 }
193
194 return SDL_SetError("SDL_DateTime conversion failed (%i)", errno);
195}
196
197#endif // SDL_TIME_UNIX
198