hush: fix handling of \<eof> in double-quoted strings

function                                             old     new   delta
encode_string                                        268     250     -18

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/hush.c

@@ -4913,11 +4913,12 @@ static int encode_string(o_string *as_string,
 			ch, ch, !!(dest->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
 	if (process_bkslash && ch == '\\') {
 		if (next == EOF) {
-// TODO: what if in interactive shell a file with
-//  echo "unterminated string\<eof>
-// is sourced?
-			syntax_error("\\<eof>");
-			xfunc_die();
+			/* Testcase: in interactive shell a file with
+			 *  echo "unterminated string\<eof>
+			 * is sourced.
+			 */
+			syntax_error_unterm_ch('"');
+			return 0; /* error */
 		}
 		/* bash:
 		 * "The backslash retains its special meaning [in "..."]

shell/hush_test/hush-parsing/bkslash_eof2.right

@@ -0,0 +1,2 @@
+hush: syntax error: unterminated "
+One:1

shell/hush_test/hush-parsing/bkslash_eof2.tests

@@ -0,0 +1,4 @@
+printf 'echo "unterminated string\\' >test.tmp.sh
+. ./test.tmp.sh
+echo One:$?
+rm -f test.tmp.sh