From b7cbe133c87be75e8e372542393e28eaf948c4fa Mon Sep 17 00:00:00 2001
From: Ariel Abreu <facekapow@outlook.com>
Date: Mon, 22 Feb 2021 23:07:51 -0500
Subject: [PATCH] Implement os_system_version_get_current_version

---
 scripts/exported-symbols.exp |  2 +-
 src/misc.c                   | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/scripts/exported-symbols.exp b/scripts/exported-symbols.exp
index 876b82d..23a308f 100644
--- a/scripts/exported-symbols.exp
+++ b/scripts/exported-symbols.exp
@@ -281,7 +281,7 @@ _launchd_msg_send
 _load_launchd_jobs_at_loginwindow_prompt
 _mpm_uncork_fork
 _mpm_wait
-#_os_system_version_get_current_version
+_os_system_version_get_current_version
 #_os_system_version_sim_get_current_host_version
 #_os_transaction_copy_description
 _os_transaction_create
diff --git a/src/misc.c b/src/misc.c
index f3a808b..1f4004f 100644
--- a/src/misc.c
+++ b/src/misc.c
@@ -38,6 +38,7 @@
 #include <stdio.h>
 #include <xpc/internal.h>
 #include <libkern/OSByteOrder.h>
+#include <sys/sysctl.h>
 
 #define RECV_BUFFER_SIZE	65536
 
@@ -618,3 +619,35 @@ int launch_activate_socket(const char* key, int** fds, size_t* count) {
 		*count = 0;
 	return -1;
 };
+
+struct os_system_version {
+	unsigned int major;
+	unsigned int minor;
+	unsigned int patch;
+};
+
+int os_system_version_get_current_version(struct os_system_version* version_info) {
+	char version_string[48] = {0};
+	size_t version_string_length = sizeof(version_string);
+	char* ptr = NULL;
+	int status = 0;
+
+	if ((status = sysctlbyname("kern.osproductversion", version_string, &version_string_length, NULL, 0)) != 0)
+		goto out;
+
+	version_info->major = strtoul(version_string, &ptr, 10);
+	if (*ptr != '\0') {
+		version_info->minor = strtoul(ptr + 1, &ptr, 10);
+		if (*ptr != '\0') {
+			version_info->patch = strtoul(ptr + 1, &ptr, 10);
+		} else {
+			version_info->patch = 0;
+		}
+	} else {
+		version_info->minor = 0;
+		version_info->patch = 0;
+	}
+
+out:
+	return status;
+};