Function memcmp

#[no_mangle]
pub unsafe extern "C" fn memcmp(
    ptr1: *const u8,
    ptr2: *const u8,
    num: usize,
) -> i32

Compares two blocks of memory byte by byte.

This function compares the first num bytes of the memory blocks pointed to by ptr1 and ptr2. If the memory blocks are identical, it returns 0. Otherwise, it returns a positive or negative value based on the first differing byte.

Arguments

• ptr1 - A pointer to the first memory block.
• ptr2 - A pointer to the second memory block.
• num - The number of bytes to compare.

Returns

A value indicating the result of the comparison: 0 if the blocks are equal, or the difference between the first differing byte.

Safety

This function is unsafe because it operates directly on raw pointers.