From 8dfefb46d10b3004d2f07d4e8976680ad9a79208 Mon Sep 17 00:00:00 2001
From: Dan Kegel <dkegel@fastly.com>
Date: Wed, 5 May 2021 08:33:16 -0700
Subject: [PATCH] wasi: do not crash if argc is 0

Instead, leave args at its default value (which provides a fake argv[0] as it has for a long time).

linux and mac do not seem affected.

Fixes #1862 (tinygo apps after v0.17.0-113-g7b761fa crash if run without argv[0])
---
 src/runtime/runtime_wasm_wasi.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/runtime/runtime_wasm_wasi.go b/src/runtime/runtime_wasm_wasi.go
index 02fa0260..b1a58886 100644
--- a/src/runtime/runtime_wasm_wasi.go
+++ b/src/runtime/runtime_wasm_wasi.go
@@ -30,6 +30,9 @@ func init() {
 	// these args (argv).
 	var argc, argv_buf_size uint32
 	args_sizes_get(&argc, &argv_buf_size)
+	if argc == 0 {
+		return
+	}
 
 	// Obtain the command line arguments
 	argsSlice := make([]unsafe.Pointer, argc)