* Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
*/
+#include <ctype.h>
+#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define DEBUG_EXPR 0
-static int expr_eq(struct expr *e1, struct expr *e2);
static struct expr *expr_eliminate_yn(struct expr *e);
struct expr *expr_alloc_symbol(struct symbol *sym)
* equals some operand in the other (operands do not need to appear in the same
* order), recursively.
*/
-static int expr_eq(struct expr *e1, struct expr *e2)
+int expr_eq(struct expr *e1, struct expr *e2)
{
int res, old_count;
+ /*
+ * A NULL expr is taken to be yes, but there's also a different way to
+ * represent yes. expr_is_yes() checks for either representation.
+ */
+ if (!e1 || !e2)
+ return expr_is_yes(e1) && expr_is_yes(e2);
+
if (e1->type != e2->type)
return 0;
switch (e1->type) {