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libefi: add efi_devpath_next_instance()
UEFI device path may be path to one device, or concatenated list of instances to different devices (textually represented as comma separated list). Provide generic function to get next instance from device path. Returns next instance or end node. The use case is like: EFI_DEVICE_PATH *node = (EFI_DEVICE_PATH *)buf; while (!IsDevicePathEnd(node)) { process(node); node = efi_devpath_next_instance(node); } Where buf is pointing to either single device path or concatenated list of device paths (such as from ConIn or ConOut). Reviewers: imp Differential Revision: https://reviews.freebsd.org/D40081
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@ -97,6 +97,7 @@ void efi_close_devpath(EFI_HANDLE);
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EFI_HANDLE efi_devpath_handle(EFI_DEVICE_PATH *);
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EFI_DEVICE_PATH *efi_devpath_last_node(EFI_DEVICE_PATH *);
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EFI_DEVICE_PATH *efi_devpath_trim(EFI_DEVICE_PATH *);
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EFI_DEVICE_PATH *efi_devpath_next_instance(EFI_DEVICE_PATH *);
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bool efi_devpath_match(EFI_DEVICE_PATH *, EFI_DEVICE_PATH *);
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bool efi_devpath_match_node(EFI_DEVICE_PATH *, EFI_DEVICE_PATH *);
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bool efi_devpath_is_prefix(EFI_DEVICE_PATH *, EFI_DEVICE_PATH *);
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@ -575,6 +575,23 @@ efi_devpath_last_node(EFI_DEVICE_PATH *devpath)
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return (devpath);
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}
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/*
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* Walk device path nodes, return next instance or end node.
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*/
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EFI_DEVICE_PATH *
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efi_devpath_next_instance(EFI_DEVICE_PATH *devpath)
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{
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while (!IsDevicePathEnd(devpath)) {
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devpath = NextDevicePathNode(devpath);
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if (IsDevicePathEndType(devpath) &&
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devpath->SubType == END_INSTANCE_DEVICE_PATH_SUBTYPE) {
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devpath = NextDevicePathNode(devpath);
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break;
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}
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}
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return (devpath);
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}
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EFI_DEVICE_PATH *
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efi_devpath_trim(EFI_DEVICE_PATH *devpath)
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{
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