awk: unbreak "cmd" | getline

function                                             old     new   delta
evaluate                                            3337    3343      +6
Signed-off-by: NDenys Vlasenko <vda.linux@googlemail.com>

editors/awk.c

@@ -3156,7 +3156,8 @@ static var *evaluate(node *op, var *res)
 			if (op1) {
 				rsm = newfile(L.s);
 				if (!rsm->F) {
-					if (opinfo == TI_PGETLINE) {
+					/* NB: can't use "opinfo == TI_PGETLINE", would break "cmd" | getline */
+					if ((opinfo & OPCLSMASK) == OC_PGETLINE) {
 						rsm->F = popen(L.s, "r");
 						rsm->is_pipe = TRUE;
 					} else {

testsuite/awk.tests

@@ -455,4 +455,9 @@ testing "awk print + redirect" \
 	"STDERR %s\n" \
 	'' ''
 
+testing "awk \"cmd\" | getline" \
+	"awk 'BEGIN { \"echo HELLO\" | getline; print }'" \
+	"HELLO\n" \
+	'' ''
+
 exit $FAILCOUNT