From 026d92f58bec731efc2356bdc9b5851baa62bfca Mon Sep 17 00:00:00 2001
From: tobil4sk <tobil4sk@outlook.com>
Date: Thu, 26 Aug 2021 19:31:56 +0100
Subject: [PATCH] Fix `put_env` inconsistency between platforms #229

* When `put_env` is called with an empty string for `v`, it now unsets
the variable on all platforms, not just windows
---
 libs/std/sys.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/libs/std/sys.c b/libs/std/sys.c
index 1a7ce00e..4bbb98ec 100644
--- a/libs/std/sys.c
+++ b/libs/std/sys.c
@@ -96,9 +96,14 @@ static value put_env( value e, value v ) {
 	if( putenv(val_string(buffer_to_string(b))) != 0 )
 		neko_error();
 #else
+	char *val;
 	val_check(e,string);
 	val_check(v,string);
-	if( setenv(val_string(e),val_string(v),1) != 0 )
+	val = val_string(v);
+	if( val[0] == '\0' ) {
+		if( unsetenv(val_string(e)) != 0 )
+			neko_error();
+	} else if( setenv(val_string(e),val,1) != 0 )
 		neko_error();
 #endif
 	return val_true;