bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

add memrchr libc function

Browse source
This commit is contained in:
Oliver Schneider 2017-01-12 09:26:22 +01:00
parent 24870428a7
commit 374232c832
No known key found for this signature in database
GPG key ID: 56D6EEA0FC67AC46
1 changed files with 12 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

12
src/terminator/mod.rs
View file

@ -405,6 +405,18 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
self.write_primval(dest, PrimVal::Bytes(result as u128), dest_ty)?;
}
"memrchr" => {
let ptr = args[0].read_ptr(&self.memory)?;
let val = self.value_to_primval(args[1], usize)?.to_u64() as u8;
let num = self.value_to_primval(args[2], usize)?.to_u64();
if let Some(idx) = self.memory.read_bytes(ptr, num)?.iter().rev().position(|&c| c == val) {
let new_ptr = ptr.offset(num - idx as u64 - 1);
self.write_value(Value::ByVal(PrimVal::Ptr(new_ptr)), dest, dest_ty)?;
} else {
self.write_value(Value::ByVal(PrimVal::Bytes(0)), dest, dest_ty)?;
}
}
"memchr" => {
let ptr = args[0].read_ptr(&self.memory)?;
let val = self.value_to_primval(args[1], usize)?.to_u64()? as u8;