Fixes #143 Implement a clock_gettime replacement (#144)

src/Makefile

@@ -30,7 +30,7 @@ EWM_OBJECTS=$(EWM_SOURCES:.c=.o)
 EWM_LIBS=-lSDL2
 
 CPU_TEST_EXECUTABLE=cpu_test
-CPU_TEST_SOURCES=cpu.c ins.c mem.c fmt.c cpu_test.c
+CPU_TEST_SOURCES=cpu.c ins.c mem.c fmt.c utl.c cpu_test.c
 CPU_TEST_OBJECTS=$(CPU_TEST_SOURCES:.c=.o)
 CPU_TEST_LIBS=
 
@@ -40,12 +40,12 @@ SCR_TEST_OBJECTS=$(SCR_TEST_SOURCES:.c=.o)
 SCR_TEST_LIBS=-lSDL2
 
 CPU_BENCH=cpu_bench
-CPU_BENCH_SOURCES=cpu.c ins.c mem.c fmt.c cpu_bench.c
+CPU_BENCH_SOURCES=cpu.c ins.c mem.c fmt.c utl.c cpu_bench.c
 CPU_BENCH_OBJECTS=$(CPU_BENCH_SOURCES:.c=.o)
 CPU_BENCH_LIBS=
 
 MEM_BENCH=mem_bench
-MEM_BENCH_SOURCES=cpu.c ins.c mem.c fmt.c mem_bench.c
+MEM_BENCH_SOURCES=cpu.c ins.c mem.c fmt.c utl.c mem_bench.c
 MEM_BENCH_OBJECTS=$(MEM_BENCH_SOURCES:.c=.o)
 MEM_BENCH_LIBS=
 

src/cpu_bench.c

@@ -27,6 +27,7 @@
 #include "cpu.h"
 #include "ins.h"
 #include "mem.h"
+#include "utl.h"
 
 #define CPU_BENCH_ITERATIONS (100 * 1000 * 1000)
 

src/cpu_test.c

@@ -29,6 +29,7 @@
 
 #include "cpu.h"
 #include "mem.h"
+#include "utl.h"
 
 int test(int model, uint16_t start_addr, uint16_t success_addr, char *rom_path) {
    struct cpu_t *cpu = cpu_create(model);

src/mem_bench.c

@@ -26,6 +26,7 @@
 
 #include "cpu.h"
 #include "mem.h"
+#include "utl.h"
 
 #define MEM_BENCH_ITERATIONS (100 * 1000 * 1000)
 

src/utl.c

@@ -23,6 +23,12 @@
 #include <stddef.h>
 #include <string.h>
 
+#if __APPLE__ && __MACH__
+#include <sys/_types/_timespec.h>
+#include <mach/mach.h>
+#include <mach/clock.h>
+#endif
+
 #include "utl.h"
 
 bool ewm_utl_endswith(char *s, char *suffix) {
@@ -33,3 +39,25 @@ bool ewm_utl_endswith(char *s, char *suffix) {
    }
    return false;
 }
+
+#if (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200)
+int clock_gettime(clockid_t clk_id, struct timespec *tp) {
+   if (clk_id != CLOCK_REALTIME) {
+      return -1;
+   }
+
+   kern_return_t result = KERN_SUCCESS;
+
+   clock_serv_t cclock;
+   mach_timespec_t mts;
+
+   host_get_clock_service(mach_host_self(), clk_id, &cclock);
+   result = clock_get_time(cclock, &mts);
+   mach_port_deallocate(mach_task_self(), cclock);
+
+   tp->tv_sec = mts.tv_sec;
+   tp->tv_nsec = mts.tv_nsec;
+
+   return result;
+}
+#endif

src/utl.h

@@ -25,6 +25,17 @@
 
 #include <stdbool.h>
 
+#if __APPLE__ && __MACH__
+#include <mach/clock.h>
+#include <Availability.h>
+#endif
+
 bool ewm_utl_endswith(char *s, char *suffix);
 
+#if defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200
+#define CLOCK_REALTIME CALENDAR_CLOCK
+typedef int clockid_t;
+int clock_gettime(clockid_t clk_id, struct timespec *tp);
+#endif
+
 #endif // EWM_UTL_H