9.5 Validator

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int peios_mp_validate(const void *buf, size_t len, uint32_t max_depth);

peios_mp_validate confirms buf/len is exactly one well-formed MessagePack value: UTF-8 strings, nesting bounded by max_depth, no trailing bytes, non-empty. Returns 0 if valid, -1 with errno == EINVAL otherwise.

Crucially, its acceptance matches the kernel's emit-time check, so a 0 return means the event emit calls will accept the payload — at this depth bound. Pass KMES_CONFIG_MAX_NESTING_DEPTH_DEFAULT (32) for the default emit limit; the top-level value is depth 1. Validate before emitting when a payload comes from an untrusted or dynamic source, so you turn a would-be EINVAL from the kernel into a check you control.

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