From cd11aa44e2c41da68e05482ac607dca37545016b Mon Sep 17 00:00:00 2001
From: Jay Oster <jay@kodewerx.org>
Date: Mon, 2 Oct 2023 11:57:44 -0700
Subject: [PATCH] Replace heapless with the much smaller arrayvec

---
 Cargo.toml | 2 +-
 README.md  | 1 -
 src/lib.rs | 8 +++-----
 3 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 3b0b20f..f6c77e9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -44,10 +44,10 @@ crate-type = ["staticlib", "cdylib"]
 
 [dependencies]
 anyhow = { version = "1.0.31", default-features = false }
+arrayvec = { version = "0.7.4", default-features = false }
 crankstart-sys = { version = "0.1.2", path = "crankstart-sys" }
 euclid = { version = "0.22.9", default-features = false, features = [ "libm" ] }
 hashbrown = "0.14.0"
-heapless = "0.6.1"
 
 [dev-dependencies]
 randomize = "3.0.1"
diff --git a/README.md b/README.md
index 8433ac8..67c9a4f 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,6 @@ crankstart-sys = { path = "../crankstart/crankstart-sys" }
 anyhow = { version = "1.0.31", default-features = false }
 euclid = { version = "0.22.9", default-features = false, features = [ "libm" ] }
 hashbrown = "0.14.0"
-heapless = "0.6.1"
 
 [dependencies.cstr_core]
 version = "=0.1.2"
diff --git a/src/lib.rs b/src/lib.rs
index 4722d57..386d71b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -292,12 +292,10 @@ fn abort_with_addr(addr: usize) -> ! {
 
 #[panic_handler]
 fn panic(#[allow(unused)] panic_info: &PanicInfo) -> ! {
-    use {
-        core::fmt::Write,
-        heapless::{consts::*, String},
-    };
+    use arrayvec::ArrayString;
+    use core::fmt::Write;
     if let Some(location) = panic_info.location() {
-        let mut output: String<U1024> = String::new();
+        let mut output = ArrayString::<1024>::new();
         let payload = if let Some(payload) = panic_info.payload().downcast_ref::<&str>() {
             payload
         } else {