mov eax, DWORD PTR [ebp+8] movzx eax, BYTE PTR [eax] mov BYTE PTR [ebp-1], al

These three lines of code are written in assembly language and perform the following operations:

1. The first line moves the contents of the memory location pointed to by the stack pointer plus 8 bytes (i.e., the second argument passed to the function) into the EAX register.
2. The second line moves the byte value located at the memory address pointed to by the EAX register into the EAX register, while zero-extending it to a full DWORD.
3. The third line moves the contents of the AL register (i.e., the least significant byte of the EAX register) into the memory location pointed to by the stack pointer minus 1 byte (i.e., the return value of the function).

In summary, these lines of code are likely part of a function that takes a pointer to a string as an argument, retrieves the first byte of the string, and returns it as a single byte value.