From 70430dc82879b0791a5ce9f20768f5d1562b39f7 Mon Sep 17 00:00:00 2001
From: JJ Bliss <jj@infinity.garden>
Date: Wed, 6 May 2026 19:55:47 -0400
Subject: [PATCH] file.rom test no longer crashes the emulator

---
 uxn/file.ha | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/uxn/file.ha b/uxn/file.ha
index f37c312..4e16a76 100644
--- a/uxn/file.ha
+++ b/uxn/file.ha
@@ -134,8 +134,20 @@ fn filestat_to_addr(fi: u8, state: *uxn) void = {
 			case =>
 				fmt::fatal("Bad String encoding in filename");
 		};
-		const stat = os::fstat(state.files[fi].file: io::file)!;
-		const fsize = stat.sz: u32;
+		const fstat = match(os::fstat(state.files[fi].file: io::file)){
+			case let fstat: fs::filestat =>
+				yield fstat;
+			case let err: fs::error =>
+				yield void;
+			
+		};
+		const fsize = match(fstat){
+			case let stat: fs::filestat =>
+				yield stat.sz: u32;
+			case =>
+				yield 0: u32;
+			 
+		};
 		const modestring = if(fsize <= 0xFFFF){
 						yield fmt::asprintf("{:x.4}",fsize)!;
 					}else {
@@ -218,16 +230,23 @@ fn filestat_to_addr(fi: u8, state: *uxn) void = {
 	};
 	return;
 };
+
 fn write_file_from_addr(fi: u8,state: *uxn) void = {
 	const length = if(fi == 0) { yield short_from_bytes(state.dev[0xaa],state.dev[0xab]); }
 			else { yield short_from_bytes(state.dev[0xba],state.dev[0xbb]); };
 	const srcaddr = if(fi == 0) { yield short_from_bytes(state.dev[0xae],state.dev[0xaf]); }
 			else { yield short_from_bytes(state.dev[0xbe],state.dev[0xbf]); };
-	const endaddr = srcaddr + length;
+	let endaddr = srcaddr + length;
 	const appendf: bool = if(fi == 0) { yield state.dev[0xa7] != 0; }
 			else { yield state.dev[0xb7] != 0; };
-	fmt::printfln("Writing {} bytes from 0x{:x}", length, srcaddr)!;
-	const bytes: []u8 = state.ram[srcaddr..endaddr];
+	// fmt::printfln("Writing {} bytes from 0x{:x}", length, srcaddr)!;
+	fmt::printfln("Writing {} bytes from 0x{:x} to 0x{:x}", endaddr-srcaddr, srcaddr,endaddr)!;
+	// const bytes: []u8 = state.ram[srcaddr..endaddr];
+	const bytes: []u8 = if(endaddr < srcaddr){
+		yield state.ram[srcaddr..];	
+	} else {
+		yield state.ram[srcaddr..endaddr];	
+	};
 	let byteswritten: u16 = 0;
 
 	if(!state.files[fi].exists){