From f9a26b5aec6cfb32deac895d68ebbe9b8ec969d1 Mon Sep 17 00:00:00 2001
From: Stefan Arentz <stefan@arentz.ca>
Date: Mon, 13 Mar 2017 11:09:49 -0400
Subject: [PATCH] Fixes #143 Implement a clock_gettime replacement

---
 src/Makefile    |  6 +++---
 src/cpu_bench.c |  1 +
 src/cpu_test.c  |  1 +
 src/mem_bench.c |  1 +
 src/utl.c       | 28 ++++++++++++++++++++++++++++
 src/utl.h       | 11 +++++++++++
 6 files changed, 45 insertions(+), 3 deletions(-)

diff --git a/src/Makefile b/src/Makefile
index 7effe59..2513e87 100644
--- a/src/Makefile
+++ b/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=
 
diff --git a/src/cpu_bench.c b/src/cpu_bench.c
index 81c5813..216512f 100644
--- a/src/cpu_bench.c
+++ b/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)
 
diff --git a/src/cpu_test.c b/src/cpu_test.c
index 1b012b1..d5d0d7f 100644
--- a/src/cpu_test.c
+++ b/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);
diff --git a/src/mem_bench.c b/src/mem_bench.c
index b4f0740..97ab5a4 100644
--- a/src/mem_bench.c
+++ b/src/mem_bench.c
@@ -26,6 +26,7 @@
 
 #include "cpu.h"
 #include "mem.h"
+#include "utl.h"
 
 #define MEM_BENCH_ITERATIONS (100 * 1000 * 1000)
 
diff --git a/src/utl.c b/src/utl.c
index b5202cb..f66beef 100644
--- a/src/utl.c
+++ b/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
diff --git a/src/utl.h b/src/utl.h
index 57d2324..5834b1e 100644
--- a/src/utl.h
+++ b/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