Bios: try supporting FreeBSD

It prints nothing on my VM. Don't know if it works on a physical machine.

CHANGELOG.md

@@ -8,7 +8,7 @@ Notable Changes:
 
 Features:
 * Windows (7 and newer) is officially and fully supported
-* FreeBSD support is improved greatly (Cpu Temp, Cpu Usage, Disk, Host, Processes, Swap, Terminal / Shell, Uptime)
+* FreeBSD support is improved greatly (Bios, Cpu Temp, Cpu Usage, Disk, Host, Processes, Swap, Terminal / Shell, Uptime)
 * Adds a new flag `--stat`, which prints time usage for individual modules
 * Adds Wifi module which supports Windows and macOS
 * Adds data source option for logo printing

CMakeLists.txt

@@ -380,7 +380,7 @@ elseif(BSD)
         src/common/processing_linux.c
         src/common/sysctl.c
         src/detection/battery/battery_nosupport.c
-        src/detection/bios/bios_nosupport.c
+        src/detection/bios/bios_bsd.c
         src/detection/board/board_nosupport.c
         src/detection/chassis/chassis_nosupport.c
         src/detection/cpu/cpu_bsd.c

src/detection/bios/bios_bsd.c

@@ -0,0 +1,26 @@
+#include "bios.h"
+
+#include <kenv.h>
+
+static void kenvLookup(const char* name, FFstrbuf* result)
+{
+    ffStrbufEnsureFree(result, 255);
+    int len = kenv(KENV_GET, name, result->chars, 256);
+    if(len > 0)
+        result->length = (uint32_t) len;
+}
+
+void ffDetectBios(FFBiosResult* bios)
+{
+    ffStrbufInit(&bios->error);
+    ffStrbufInit(&bios->biosDate);
+    ffStrbufInit(&bios->biosRelease);
+    ffStrbufInit(&bios->biosVendor);
+    ffStrbufInit(&bios->biosVersion);
+
+    //https://wiki.ghostbsd.org/index.php/Kenv
+    kenvLookup("smbios.bios.reldate", &bios->biosDate);
+    kenvLookup("smbios.system.product", &bios->biosRelease);
+    kenvLookup("smbios.bios.vendor", &bios->biosVendor);
+    kenvLookup("smbios.bios.version", &bios->biosVersion);
+}