+#else
+ return NULL;
+#endif
+}
+
+#ifdef WIN32
+# define HAVE_TIMEGETTIME 1
+# define HAVE_QUERYPERFORMANCECOUNTER 1
+# define HAVE_Sleep 1
+#endif
+
+#ifndef WIN32
+#if defined(CLOCK_MONOTONIC) || defined(CLOCK_HIRES)
+# define HAVE_CLOCKGETTIME 1
+#endif
+// FIXME improve this check, manpage hints to DST_NONE
+# define HAVE_GETTIMEOFDAY 1
+#endif
+
+#ifndef WIN32
+// on Win32, select() cannot be used with all three FD list args being NULL according to MSDN
+// (so much for POSIX...)
+# ifdef FD_SET
+# define HAVE_SELECT 1
+# endif
+#endif
+
+#ifndef WIN32
+// FIXME improve this check
+# define HAVE_USLEEP 1
+#endif
+
+// this one is referenced elsewhere
+cvar_t sys_usenoclockbutbenchmark = {CVAR_SAVE, "sys_usenoclockbutbenchmark", "0", "don't use ANY real timing, and simulate a clock (for benchmarking); the game then runs as fast as possible. Run a QC mod with bots that does some stuff, then does a quit at the end, to benchmark a server. NEVER do this on a public server."};
+
+// these are not
+static cvar_t sys_debugsleep = {0, "sys_debugsleep", "0", "write requested and attained sleep times to standard output, to be used with gnuplot"};
+static cvar_t sys_usesdlgetticks = {CVAR_SAVE, "sys_usesdlgetticks", "0", "use SDL_GetTicks() timer (less accurate, for debugging)"};
+static cvar_t sys_usesdldelay = {CVAR_SAVE, "sys_usesdldelay", "0", "use SDL_Delay() (less accurate, for debugging)"};
+#if HAVE_QUERYPERFORMANCECOUNTER
+static cvar_t sys_usequeryperformancecounter = {CVAR_SAVE, "sys_usequeryperformancecounter", "0", "use windows QueryPerformanceCounter timer (which has issues on multicore/multiprocessor machines and processors which are designed to conserve power) for timing rather than timeGetTime function (which has issues on some motherboards)"};
+#endif
+#if HAVE_CLOCKGETTIME
+static cvar_t sys_useclockgettime = {CVAR_SAVE, "sys_useclockgettime", "1", "use POSIX clock_gettime function (not adjusted by NTP on some older Linux kernels) for timing rather than gettimeofday (which has issues if the system time is stepped by ntpdate, or apparently on some Xen installations)"};
+#endif
+
+static double benchmark_time; // actually always contains an integer amount of milliseconds, will eventually "overflow"
+
+void Sys_Init_Commands (void)
+{
+ Cvar_RegisterVariable(&sys_debugsleep);
+ Cvar_RegisterVariable(&sys_usenoclockbutbenchmark);
+#if HAVE_TIMEGETTIME || HAVE_QUERYPERFORMANCECOUNTER || HAVE_CLOCKGETTIME || HAVE_GETTIMEOFDAY
+ if(sys_supportsdlgetticks)
+ {
+ Cvar_RegisterVariable(&sys_usesdlgetticks);
+ Cvar_RegisterVariable(&sys_usesdldelay);
+ }
+#endif
+#if HAVE_QUERYPERFORMANCECOUNTER
+ Cvar_RegisterVariable(&sys_usequeryperformancecounter);
+#endif
+#if HAVE_CLOCKGETTIME
+ Cvar_RegisterVariable(&sys_useclockgettime);
+#endif
+}
+
+double Sys_DirtyTime(void)
+{
+ // first all the OPTIONAL timers
+
+ // benchmark timer (fake clock)
+ if(sys_usenoclockbutbenchmark.integer)
+ {
+ double old_benchmark_time = benchmark_time;
+ benchmark_time += 1;
+ if(benchmark_time == old_benchmark_time)
+ Sys_Error("sys_usenoclockbutbenchmark cannot run any longer, sorry");
+ return benchmark_time * 0.000001;
+ }
+#if HAVE_QUERYPERFORMANCECOUNTER
+ if (sys_usequeryperformancecounter.integer)
+ {
+ // LordHavoc: note to people modifying this code, DWORD is specifically defined as an unsigned 32bit number, therefore the 65536.0 * 65536.0 is fine.
+ // QueryPerformanceCounter
+ // platform:
+ // Windows 95/98/ME/NT/2000/XP
+ // features:
+ // very accurate (CPU cycles)
+ // known issues:
+ // does not necessarily match realtime too well (tends to get faster and faster in win98)
+ // wraps around occasionally on some platforms (depends on CPU speed and probably other unknown factors)
+ double timescale;
+ LARGE_INTEGER PerformanceFreq;
+ LARGE_INTEGER PerformanceCount;
+
+ if (QueryPerformanceFrequency (&PerformanceFreq))
+ {
+ QueryPerformanceCounter (&PerformanceCount);
+
+ #ifdef __BORLANDC__
+ timescale = 1.0 / ((double) PerformanceFreq.u.LowPart + (double) PerformanceFreq.u.HighPart * 65536.0 * 65536.0);
+ return ((double) PerformanceCount.u.LowPart + (double) PerformanceCount.u.HighPart * 65536.0 * 65536.0) * timescale;
+ #else
+ timescale = 1.0 / ((double) PerformanceFreq.LowPart + (double) PerformanceFreq.HighPart * 65536.0 * 65536.0);
+ return ((double) PerformanceCount.LowPart + (double) PerformanceCount.HighPart * 65536.0 * 65536.0) * timescale;
+ #endif
+ }
+ else
+ {
+ Con_Printf("No hardware timer available\n");
+ // fall back to other clock sources
+ Cvar_SetValueQuick(&sys_usequeryperformancecounter, false);
+ }
+ }
+#endif
+
+#if HAVE_CLOCKGETTIME
+ if (sys_useclockgettime.integer)
+ {
+ struct timespec ts;
+# ifdef CLOCK_MONOTONIC
+ // linux
+ clock_gettime(CLOCK_MONOTONIC, &ts);
+# else
+ // sunos
+ clock_gettime(CLOCK_HIGHRES, &ts);
+# endif
+ return (double) ts.tv_sec + ts.tv_nsec / 1000000000.0;
+ }
+#endif
+
+ // now all the FALLBACK timers
+ if(sys_supportsdlgetticks && sys_usesdlgetticks.integer)
+ return (double) Sys_SDL_GetTicks() / 1000.0;
+#if HAVE_GETTIMEOFDAY
+ {
+ struct timeval tp;
+ gettimeofday(&tp, NULL);
+ return (double) tp.tv_sec + tp.tv_usec / 1000000.0;
+ }
+#elif HAVE_TIMEGETTIME
+ {
+ static int firsttimegettime = true;
+ // timeGetTime
+ // platform:
+ // Windows 95/98/ME/NT/2000/XP
+ // features:
+ // reasonable accuracy (millisecond)
+ // issues:
+ // wraps around every 47 days or so (but this is non-fatal to us, odd times are rejected, only causes a one frame stutter)
+
+ // make sure the timer is high precision, otherwise different versions of windows have varying accuracy
+ if (firsttimegettime)
+ {
+ timeBeginPeriod(1);
+ firsttimegettime = false;
+ }
+
+ return (double) timeGetTime() / 1000.0;
+ }
+#else
+ // fallback for using the SDL timer if no other timer is available
+ // this calls Sys_Error() if not linking against SDL
+ return (double) Sys_SDL_GetTicks() / 1000.0;
+#endif
+}
+
+void Sys_Sleep(int microseconds)
+{
+ double t = 0;
+ if(sys_usenoclockbutbenchmark.integer)
+ {
+ if(microseconds)
+ {
+ double old_benchmark_time = benchmark_time;
+ benchmark_time += microseconds;
+ if(benchmark_time == old_benchmark_time)
+ Sys_Error("sys_usenoclockbutbenchmark cannot run any longer, sorry");
+ }
+ return;
+ }
+ if(sys_debugsleep.integer)
+ {
+ t = Sys_DirtyTime();
+ }
+ if(sys_supportsdlgetticks && sys_usesdldelay.integer)
+ {
+ Sys_SDL_Delay(microseconds / 1000);
+ }
+#if HAVE_SELECT
+ else
+ {
+ struct timeval tv;
+ tv.tv_sec = microseconds / 1000000;
+ tv.tv_usec = microseconds % 1000000;
+ select(0, NULL, NULL, NULL, &tv);
+ }
+#elif HAVE_USLEEP
+ else
+ {
+ usleep(microseconds);
+ }
+#elif HAVE_Sleep
+ else
+ {
+ Sleep(microseconds / 1000);
+ }
+#else
+ else
+ {
+ Sys_SDL_Delay(microseconds / 1000);
+ }
+#endif
+ if(sys_debugsleep.integer)
+ {
+ t = Sys_DirtyTime() - t;
+ Sys_PrintfToTerminal("%d %d # debugsleep\n", microseconds, (unsigned int)(t * 1000000));
+ }
+}
+
+void Sys_PrintfToTerminal(const char *fmt, ...)
+{
+ va_list argptr;
+ char msg[MAX_INPUTLINE];
+
+ va_start(argptr,fmt);
+ dpvsnprintf(msg,sizeof(msg),fmt,argptr);
+ va_end(argptr);
+
+ Sys_PrintToTerminal(msg);
+}
+
+#ifndef WIN32
+static const char *Sys_FindInPATH(const char *name, char namesep, const char *PATH, char pathsep, char *buf, size_t bufsize)
+{
+ const char *p = PATH;
+ const char *q;
+ if(p && name)
+ {
+ while((q = strchr(p, ':')))
+ {
+ dpsnprintf(buf, bufsize, "%.*s%c%s", (int)(q-p), p, namesep, name);
+ if(FS_SysFileExists(buf))
+ return buf;
+ p = q + 1;
+ }
+ if(!q) // none found - try the last item
+ {
+ dpsnprintf(buf, bufsize, "%s%c%s", p, namesep, name);
+ if(FS_SysFileExists(buf))
+ return buf;
+ }
+ }
+ return name;