string hash function faults w empty string

fixes maps[""] R=r OCL=20909 CL=20911

string hash function faults w empty string
fixes maps[""] R=r OCL=20909 CL=20911
e9564291 · Ken Thompson · 7dd62cb3 · e9564291
Commit e9564291 authored Dec 10, 2008 by Ken Thompson
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runtime.c src/runtime/runtime.c +2 -0

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--- a/src/runtime/runtime.c
+++ b/src/runtime/runtime.c
@@ -583,6 +583,8 @@ static uint64
 stringhash(uint32 s, string *a)
 {
 	USED(s);
+	if(*a == nil)
+		return memhash(emptystring->len, emptystring->str);
 	return memhash((*a)->len, (*a)->str);
 }