- fix for out-of-bounds error found by rsc

- removed tests that may have wrong Go code from Makefile

R=r
OCL=15532
CL=15532

usr/gri/gosrc/platform.go

@@ -21,7 +21,7 @@ func GetEnv(key string) string {
 	n := len(key);
 	for i := 0; i < sys.envc(); i++ {
 		v := sys.envv(i);
-		if v[0 : n] == key {
+		if n < len(v) && v[0 : n] == key && v[n] == '=' {
 			return v[n + 1 : len(v)];  // +1: trim "="
 		}
 	}

usr/gri/pretty/Makefile

@@ -12,8 +12,6 @@ test: pretty
 	pretty *.go
 	pretty ../gosrc/*.go
 	pretty $(GOROOT)/test/sieve.go
-	pretty $(GOROOT)/test/bugs/*.go  # some files legally don't compile
-	pretty $(GOROOT)/test/fixedbugs/*.go  # some files legally don't compile
 	pretty $(GOROOT)/src/pkg/*.go
 	pretty $(GOROOT)/src/lib/flag.go
 	pretty $(GOROOT)/src/lib/fmt.go

usr/gri/pretty/platform.go

@@ -21,7 +21,7 @@ func GetEnv(key string) string {
 	n := len(key);
 	for i := 0; i < sys.envc(); i++ {
 		v := sys.envv(i);
-		if v[0 : n] == key {
+		if n < len(v) && v[0 : n] == key && v[n] == '=' {
 			return v[n + 1 : len(v)];  // +1: trim "="
 		}
 	}