From 987d3fcaf7ac1028852ffe7e8193d5cbc7294006 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alexander=20Mei=C3=9Fner?= <AlexanderMeissner@gmx.net>
Date: Mon, 24 Jan 2022 18:37:11 +0100
Subject: [PATCH] Implements account resizing in BorrowedAccount.

---
 sdk/src/transaction_context.rs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/sdk/src/transaction_context.rs b/sdk/src/transaction_context.rs
index 45ef3fe9bfd376..8d29989f91426c 100644
--- a/sdk/src/transaction_context.rs
+++ b/sdk/src/transaction_context.rs
@@ -472,10 +472,15 @@ impl<'a> BorrowedAccount<'a> {
         self.verify_writability()
     }
 
-    /*pub fn realloc(&self, new_len: usize, zero_init: bool) {
+    /// Resizes the account data (transaction wide)
+    ///
+    /// Fills it with zeros at the end if is extended or truncates at the end otherwise.
+    pub fn set_data_length(&mut self, new_len: usize) -> Result<(), InstructionError> {
+        self.account.data_mut().resize(new_len, 0);
         // TODO: return Err(InstructionError::InvalidRealloc);
         // TODO: return Err(InstructionError::AccountDataSizeChanged);
-    }*/
+        self.verify_writability()
+    }
 
     /// Deserializes the account data into a state
     pub fn get_state<T: serde::de::DeserializeOwned>(&self) -> Result<T, InstructionError> {