ps2: normalize CWD to work around PS2SDK bug

Workaround for PS2SDK issue ps2dev/ps2sdk#805.

PS2SDK's initialization routine does not properly set the CWD for HDD paths,
leading to all slashes being converted to backslashes.

This change ensures that they are converted back to slashes, until the
issue is properly fixed in PS2SDK.

Author: mlevogiannis

frontend/drivers/platform_ps2.c

@@ -310,6 +310,16 @@ static void common_init_drivers(bool extra_drivers)
    poweroffSetCallback(&poweroffHandler, NULL);
 
    getcwd(cwd, sizeof(cwd));
+
+   // Workaround for PS2SDK issue: https://github.com/ps2dev/ps2sdk/issues/805
+   // PS2SDK's initialization routine does not properly set the CWD for HDD
+   // paths, leading to all slashes being converted to backslashes. Manually
+   // convert them back to slashes to work around the issue until it is
+   // properly fixed in PS2SDK.
+   int bootDeviceID  = getBootDeviceID(cwd);
+   if (bootDeviceID == BOOT_DEVICE_HDD || bootDeviceID == BOOT_DEVICE_HDD0)
+      pathname_conform_slashes_to_os(cwd);
+
 #if !defined(IS_SALAMANDER) && !defined(DEBUG)
    /* If it is not Salamander, we need to go one level
     * up for setting the CWD. */