Assembly Mstore

function name() public pure returns (string memory) {
    // Return the name is Seaport.
    // Seaport actual bytes is 53 65 61 70 6f 72 74
    assembly {
        mstore(0x20, 0x20)
        mstore(0x47, 0x07536561706f7274)
        return(0x20, 0x60)
    }
}

anybody please explain me about the this function.

why we need to store 0x47 and why we need to return (0x20,0x60)

A new type of question.

The mstore instruction in Solidity takes two arguments: an address and a value.
It stores the value at the specified address in memory.
In Solidity, string is a dynamically-sized byte array:

Variables of type bytes and string are special arrays. A bytes is similar to byte[ ], but it is packed tightly in calldata. string is equal to bytes but does not allow length or index access (for now).

The first line stores offset, the second line stores value,
in this case, it occupies 0x20 and 0x40, so return from 0x20 to 0x60.

Waiting for a more precise answer.

[/quote]

mstore(0x20, 0x20): This line is intended to store the length of the string, but it's placed at memory address 0x20, which is not the conventional starting point for dynamic data. In Solidity, the first 32 bytes (0x00 to 0x1f) are used to store the length of dynamic data like strings or bytes arrays.

mstore(0x47, 0x07536561706f7274): This attempts to store the string "Seaport" in memory, represented by its hexadecimal ASCII values. However, the address 0x47 seems arbitrary and does not align with proper memory management for return data.

return(0x20, 0x60): This specifies the start of the return data and its size. However, the start address 0x20 does not align with the conventional structure for dynamic data, and the size 0x60 (96 bytes) is more than necessary for the string "Seaport".