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fix stack_string bug in ch2_write1.rs #15

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fix stack_string bug in ch2_write1.rs #15

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13 changes: 12 additions & 1 deletion user/src/bin/ch2_write1.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,18 @@ pub fn main() -> i32 {
DATA_STRING.len() as isize
);
assert_eq!(write(STDOUT, &DATA_STRING.as_bytes()[..5]), 5);
let stack_string = "string from stack section\n";
// let stack_string = "string from stack section\n";
let string = "string from stack section!!\n";
let stack_string_holder: [u8; 50] = [0; 50];
let stack_string_u8 = unsafe {
core::ptr::copy(
string.as_ptr() as *const u8,
stack_string_holder.as_ptr() as *mut u8,
string.len(),
);
core::slice::from_raw_parts(stack_string_holder.as_ptr(), string.len())
};
let stack_string = core::str::from_utf8(stack_string_u8.as_ref()).unwrap();
assert_eq!(
write(STDOUT, stack_string.as_bytes()),
stack_string.len() as isize
Expand Down