tAviod seg fault when no file - plan9port - [fork] Plan 9 from user space

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---

commit 21c4c72798b0bf2fb9a2761744bc41e89fc87fcc

parent c7c29d26b7f9bcd735779859211bf525f007078e

Author: rsc 

Date:   Tue, 29 Aug 2006 20:15:01 +0000

Aviod seg fault when no file

Diffstat:
  M src/cmd/sam/shell.c                 |       5 ++++-

1 file changed, 4 insertions(+), 1 deletion(-)
---

diff --git a/src/cmd/sam/shell.c b/src/cmd/sam/shell.c

t@@ -12,7 +12,10 @@ void
 setname(File *f)
 {
         char buf[1024];
-        snprint(buf, sizeof buf, "%.*S", f->name.n, f->name.s);
+        if(f)
+                snprint(buf, sizeof buf, "%.*S", f->name.n, f->name.s);
+        else
+                buf[0] = 0;
         putenv("samfile", buf);
 }