From ab3492f05e5998f79befe6e7397175f4bdb39149 Mon Sep 17 00:00:00 2001
From: ftrvxmtrx <ftrvxmtrx@gmail.com>
Date: Mon, 26 Sep 2016 23:00:06 +0200
Subject: sam: putenv("%", ...): don't crash when no file is current

---
 sys/src/cmd/sam/shell.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/src/cmd/sam/shell.c b/sys/src/cmd/sam/shell.c
index 494bbf4a3..5028e6e4a 100644
--- a/sys/src/cmd/sam/shell.c
+++ b/sys/src/cmd/sam/shell.c
@@ -93,7 +93,7 @@ plan9(File *f, int type, String *s, int nest)
 			close(0);	/* so it won't read from terminal */
 			open("/dev/null", 0);
 		}
-		putenv("%", Strtoc(&f->name));
+		putenv("%", f == nil ? "" : Strtoc(&f->name));
 		execl(SHPATH, SH, "-c", Strtoc(&plan9cmd), nil);
 		exits("exec");
 	}
-- 
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