p-token: Port interface and program from p-token repo

interface/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "token-interface"
+version = "0.0.0"
+edition = { workspace = true }
+readme = "./README.md"
+license = { workspace = true }
+repository = { workspace = true }
+publish = false
+
+[lib]
+crate-type = ["rlib"]
+
+[dependencies]
+pinocchio = { workspace = true }
+pinocchio-pubkey = { workspace = true }

interface/src/error.rs

@@ -0,0 +1,61 @@
+//! Error types
+
+use pinocchio::program_error::ProgramError;
+
+/// Errors that may be returned by the Token program.
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub enum TokenError {
+    // 0
+    /// Lamport balance below rent-exempt threshold.
+    NotRentExempt,
+    /// Insufficient funds for the operation requested.
+    InsufficientFunds,
+    /// Invalid Mint.
+    InvalidMint,
+    /// Account not associated with this Mint.
+    MintMismatch,
+    /// Owner does not match.
+    OwnerMismatch,
+
+    // 5
+    /// This token's supply is fixed and new tokens cannot be minted.
+    FixedSupply,
+    /// The account cannot be initialized because it is already being used.
+    AlreadyInUse,
+    /// Invalid number of provided signers.
+    InvalidNumberOfProvidedSigners,
+    /// Invalid number of required signers.
+    InvalidNumberOfRequiredSigners,
+    /// State is uninitialized.
+    UninitializedState,
+
+    // 10
+    /// Instruction does not support native tokens
+    NativeNotSupported,
+    /// Non-native account can only be closed if its balance is zero
+    NonNativeHasBalance,
+    /// Invalid instruction
+    InvalidInstruction,
+    /// State is invalid for requested operation.
+    InvalidState,
+    /// Operation overflowed
+    Overflow,
+
+    // 15
+    /// Account does not support specified authority type.
+    AuthorityTypeNotSupported,
+    /// This token mint cannot freeze accounts.
+    MintCannotFreeze,
+    /// Account is frozen; all account operations will fail
+    AccountFrozen,
+    /// Mint decimals mismatch between the client and mint
+    MintDecimalsMismatch,
+    /// Instruction does not support non-native tokens
+    NonNativeNotSupported,
+}
+
+impl From<TokenError> for ProgramError {
+    fn from(e: TokenError) -> Self {
+        ProgramError::Custom(e as u32)
+    }
+}