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choppsv1
Dec 12, 2025

How would I change the following code to work with libyang v4?

	/// ...
	sleaf = (const struct lysc_node_leaf *)snode;
	return sleaf->dflt ? lyd_value_get_canonical(sleaf->module->ctx, sleaf->dflt) : NULL;
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Replies: 2 comments · 1 reply

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michalvasko
Dec 12, 2025
Maintainer

If you are fine with a string value, use just return sleaf->dflt;. If you require the value to be canonical, you need to generate it first using lyd_value_validate_dflt().
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choppsv1
Dec 12, 2025
Author

Ok, so

  1. is the new way to check if the schema node has a default: sleaf->dflt.str != NULL?

  2. I have code that used lyd_value_get_canonical(sleaf->module->ctx, sleaf->dflt) is there a reason I have to use lyd_value_validate_dflt() now instead of just changing to lyd_value_get_canonical(sleaf->module->ctx, &sleaf->dflt)?

  3. Also just curious, what value is present in sleaf->dflt.str? Is it whatever is present in the YANG module?
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@michalvasko
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michalvasko Dec 15, 2025
Maintainer

  1. Yes, that is correct.
  2. The special function is for cases when the default value includes prefixes that need to be correctly canonized.
  3. Yes, it is the exact default value from the YANG module.
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