[sys/info] Parse xnu kernel version

core/sys/info/platform_darwin.odin

@@ -3,10 +3,33 @@ package sysinfo
 
 import sys "core:sys/darwin"
 import "core:intrinsics"
+import "core:strconv"
+import "core:strings"
+import "core:fmt"
 
 @(init, private)
-init_os_version :: proc "c" () {
+init_os_version :: proc () {
 	os_version.platform = .MacOS
+
+	mib := []i32{CTL_KERN, KERN_OSRELEASE}
+	version_bits: [12]u8 // enough for 999.999.999\x00
+	ok := sysctl(mib, &version_bits)
+	if !ok {
+		return
+	}
+
+	triplet := strings.split(string(cstring(&version_bits[0])), ".", context.temp_allocator)
+	if len(triplet) == 3 {
+		major, major_ok := strconv.parse_int(triplet[0])
+		minor, minor_ok := strconv.parse_int(triplet[1])
+		patch, patch_ok := strconv.parse_int(triplet[2])
+
+		if major_ok && minor_ok && patch_ok {
+			os_version.major = major
+			os_version.minor = minor
+			os_version.patch = patch
+		}
+	}
 }
 
 @(init)
@@ -14,7 +37,7 @@ init_ram :: proc() {
 	// Retrieve RAM info using `sysinfo`
 
 	mib := []i32{CTL_HW, HW_MEMSIZE}
-	mem_size: i64
+	mem_size: u64
 	ok := sysctl(mib, &mem_size)
 	ram.total_ram = int(mem_size)
 }
@@ -35,24 +58,24 @@ sysctl :: proc(mib: []i32, val: ^$T) -> (ok: bool) {
 
 // See sysctl.h for xnu/dwrwin for details
 CTL_KERN    :: 1
-	KERN_OSTYPE    :: 1  /* string: system version */
-	KERN_OSRELEASE :: 2  /* string: system release */
-	KERN_OSREV     :: 3  /* int: system revision */
-	KERN_VERSION   :: 4  /* string: compile time info */
-	KERN_OSRELDATE :: 26 /* int: OS release date */
-	KERN_OSVERSION :: 65 /* for build number i.e. 9A127 */
+	KERN_OSTYPE    :: 1  // Darwin
+	KERN_OSRELEASE :: 2  // 21.5.0 for 12.4 Monterey 
+	KERN_OSREV     :: 3  // i32: system revision
+	KERN_VERSION   :: 4  // Darwin Kernel Version 21.5.0: Tue Apr 26 21:08:22 PDT 2022; root:xnu-8020.121.3~4/RELEASE_X86_64
+	KERN_OSRELDATE :: 26 // i32: OS release date
+	KERN_OSVERSION :: 65 // Build number, e.g. 21F79
 CTL_VM      :: 2
 CTL_VFS     :: 3
 CTL_NET     :: 4
 CTL_DEBUG   :: 5
 CTL_HW      :: 6
-	HW_MACHINE      :: 1  /* string: machine class */
-	HW_MODEL        :: 2  /* string: specific machine model */
+	HW_MACHINE      :: 1  // x86_64
+	HW_MODEL        :: 2  // MacbookPro14,1
 	HW_NCPU         :: 3  /* int: number of cpus */
 	HW_BYTEORDER    :: 4  /* int: machine byte order */
 	HW_MACHINE_ARCH :: 12 /* string: machine architecture */
 	HW_VECTORUNIT   :: 13 /* int: has HW vector unit? */
-	HW_MEMSIZE      :: 24 /* uint64_t: physical ram size */
+	HW_MEMSIZE      :: 24 // u64
 	HW_AVAILCPU     :: 25 /* int: number of available CPUs */
 
 CTL_MACHDEP :: 7