fix buffer mutating message

kernel/src/holeybytes/kernel_services/service_definition_service.rs

@@ -22,21 +22,19 @@ pub enum ServiceError {
 pub fn sds_msg_handler(vm: &mut Vm, mem_addr: u64, length: usize) -> Result<(), ServiceError> {
     let msg_vec = block_read(mem_addr, length);
     let sds_event_type: ServiceEventType = msg_vec[0].into();
-
-    // info!("Length {}", msg_vec.len());
+    let strptr = u64::from_le_bytes(msg_vec[1..9].try_into().unwrap());
+    let strlen = u64::from_le_bytes(msg_vec[9..17].try_into().unwrap()) as usize;
+    let string_vec = block_read(strptr, strlen);
+    let string = core::str::from_utf8(string_vec).expect("Our bytes should be valid utf8");
 
     use ServiceEventType::*;
     match sds_event_type {
         CreateService => {
-            let string =
-                core::str::from_utf8(&msg_vec[1..]).expect("Our bytes should be valid utf8");
             let ret = sds_create_service(string);
             vm.registers[1] = hbvm::value::Value(ret as u64);
         }
         DeleteService => todo!(),
         SearchServices => {
-            let string =
-                core::str::from_utf8(&msg_vec[1..]).expect("Our bytes should be valid utf8");
             let ret = sds_search_service(string);
             vm.registers[1] = hbvm::value::Value(ret as u64);
         }

sysdata/libraries/stn/src/buffer.hb

@@ -8,15 +8,12 @@ write := fn(msg: ^u8, buffer_id: int, length: int): void {
 	return @eca(3, buffer_id, msg, length)
 }
 
+BufferMsg := packed struct {operation: u8, msg: ^u8, msg_len: uint}
+
 create := fn(msg: ^u8): int {
-	msg_length := @inline(string.length, msg);
-	*msg = 0
-	return @eca(3, 0, msg, msg_length)
+	return @eca(3, 0, BufferMsg.(0, msg, @inline(string.length, msg)), @sizeof(BufferMsg))
 }
 
 search := fn(msg: ^u8): int {
-	msg_length := @inline(string.length, msg);
-	*msg = 3
-
-	return @eca(3, 0, msg, msg_length)
+	return @eca(3, 0, BufferMsg.(3, msg, @inline(string.length, msg)), @sizeof(BufferMsg))
 }

sysdata/libraries/stn/src/string.hb

@@ -31,9 +31,7 @@ display_int := fn(num: int, p: ^u8): ^u8 {
 }
 
 reverse := fn(s: ^u8): void {
-	//reverse a string, don't remove digits
-	len := 0
-	loop if *(s + len) == 0 break else len += 1
+	len := @inline(length, s)
 	i := 0
 	j := len - 1
 	temp := 0