From 6a09787496fabdb81525759aa5a21bdc671048e6 Mon Sep 17 00:00:00 2001
From: pfg <pfg@pfg.pw>
Date: Tue, 16 Apr 2024 15:43:22 -0400
Subject: [PATCH] sysgpu: fix overflow trying to report an error

---
 src/sysgpu/shader/ErrorList.zig | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/sysgpu/shader/ErrorList.zig b/src/sysgpu/shader/ErrorList.zig
index f6944848..42f06830 100644
--- a/src/sysgpu/shader/ErrorList.zig
+++ b/src/sysgpu/shader/ErrorList.zig
@@ -116,13 +116,17 @@ fn printCode(writer: anytype, term: std.io.tty.Config, source: []const u8, loc:
 
     // location pointer
     const line_number_len = (std.math.log10(loc_extra.line) + 1) + 3;
-    try writer.writeByteNTimes(
-        ' ',
-        line_number_len + (loc_extra.col - 1),
-    );
+    if (line_number_len > loc_extra.col) {
+        try writer.writeByteNTimes(
+            ' ',
+            line_number_len + (loc_extra.col - 1),
+        );
+    }
     try term.setColor(writer, .bold);
     try term.setColor(writer, .green);
     try writer.writeByte('^');
-    try writer.writeByteNTimes('~', loc.end - loc.start - 1);
+    if (loc.end > loc.start) {
+        try writer.writeByteNTimes('~', loc.end - loc.start - 1);
+    }
     try writer.writeByte('\n');
 }