Function p2sh_input_sigop_count 

pub fn p2sh_input_sigop_count(input: &Input, spent_output: &Output) -> u32

Returns the P2SH sigop count for a single input.

spent_output must be the output spent by input.

Returns 0 for non-P2SH inputs, coinbase inputs, and P2SH inputs where no redeem script can be extracted from the scriptSig (mirroring zcashd’s CScript::GetSigOpCount(scriptSig), which returns 0 when the scriptSig is not push-only).

This is the per-input counting used by p2sh_sigop_count for the block-wide consensus sigop total, and by the mempool standardness gate that rejects high-sigop P2SH inputs before script verification.