1 files changed, 43 insertions, 0 deletions
diff --git a/usr.bin/m4/expr.c b/usr.bin/m4/expr.c
new file mode 100644
index 0000000..6e0b45f
--- /dev/null
+++ b/usr.bin/m4/expr.c
@@ -0,0 +1,43 @@
+/* $OpenBSD: expr.c,v 1.18 2010/09/07 19:58:09 marco Exp $ */
+/*
+ * Copyright (c) 2004 Marc Espie <espie@cvs.openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#include <stdint.h>
+#include <stdio.h>
+#include <stddef.h>
+#include "mdef.h"
+#include "extern.h"
+
+int32_t end_result;
+const char *copy_toeval;
+
+extern void yy_scan_string(const char *);
+extern int yyparse(void);
+
+int
+yyerror(const char *msg)
+{
+	fprintf(stderr, "m4: %s in expr %s\n", msg, copy_toeval);
+	return(0);
+}
+
+int
+expr(const char *toeval)
+{
+	copy_toeval = toeval;
+	yy_scan_string(toeval);
+	yyparse();
+	return end_result;
+}