hush: fix "export not_yet_defined_var", fix parsing of "cmd | }"

 corner case; improve hush_leaktool.sh;
 fix some false positives in testsuite

function                                             old     new   delta
builtin_export                                       191     206     +15
parse_stream                                        2196    2200      +4

1 files changed, 25 insertions, 20 deletions

diff --git a/shell/hush.c b/shell/hush.c
index c542b7dd9..2c2750fc8 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -4459,10 +4459,6 @@ static int done_word(o_string *word, struct parse_context *ctx)
 			}
 		}
 		command->argv = add_string_to_strings(command->argv, xstrdup(word->data));
-//SEGV, but good idea.
-//		command->argv = add_string_to_strings(command->argv, word->data);
-//		word->data = NULL;
-//		word->length = 0;
 		debug_print_strings("word appended to argv", command->argv);
 	}
 
@@ -5481,14 +5477,16 @@ static struct pipe *parse_stream(char **pstring,
 		 * } is an ordinary char in this case, even inside { cmd; }
 		 * Pathological example: { ""}; } should exec "}" cmd
 		 */
-		if (ch == '}'
-		 && !(IS_NULL_PIPE(ctx.pipe)
-		     && IS_NULL_CMD(ctx.command)
-		     && dest.length == 0
-		     && !dest.o_quoted
-		    )
-		) {
-			goto ordinary_char;
+		if (ch == '}') {
+			if (!IS_NULL_CMD(ctx.command) /* cmd } */
+			 || dest.length != 0 /* word} */
+			 || dest.o_quoted    /* ""} */
+			) {
+				goto ordinary_char;
+			}
+			if (!IS_NULL_PIPE(ctx.pipe)) /* cmd | } */
+				goto skip_end_trigger;
+			/* else: } does terminate a group */
 		}
 
 		if (end_trigger && end_trigger == ch
@@ -5531,6 +5529,7 @@ static struct pipe *parse_stream(char **pstring,
 				return ctx.list_head;
 			}
 		}
+ skip_end_trigger:
 		if (is_ifs)
 			continue;
 
@@ -6420,12 +6419,11 @@ static int builtin_export(char **argv)
 	}
 
 	do {
-		const char *value;
 		char *name = *argv;
 
-		value = strchr(name, '=');
-		if (!value) {
-			/* They are exporting something without a =VALUE */
+		/* So far we do not check that name is valid */
+		if (strchr(name, '=') == NULL) {
+			/* Exporting a name without a =VALUE */
 			struct variable *var;
 
 			var = get_local_var(name);
@@ -6433,12 +6431,19 @@ static int builtin_export(char **argv)
 				var->flg_export = 1;
 				debug_printf_env("%s: putenv '%s'\n", __func__, var->varstr);
 				putenv(var->varstr);
+				continue;
 			}
-			/* bash does not return an error when trying to export
-			 * an undefined variable.  Do likewise. */
-			continue;
+			/* Exporting non-existing variable.
+			 * bash does not put it in environment,
+			 * but remembers that it is exported,
+			 * and does put it in env when it is set later.
+			 * We just set it to "" and export. */
+			name = xasprintf("%s=", name);
+		} else {
+			/* Exporting VAR=VALUE */
+			name = xstrdup(name);
 		}
-		set_local_var(xstrdup(name), 1, 0);
+		set_local_var(name, 1, 0);
 	} while (*++argv);
 
 	return EXIT_SUCCESS;