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-rw-r--r--libguile/regex-posix.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/libguile/regex-posix.h b/libguile/regex-posix.h
index 3290ffcf5..172ed928c 100644
--- a/libguile/regex-posix.h
+++ b/libguile/regex-posix.h
@@ -45,11 +45,14 @@
* If you do not wish that, delete this exception notice.
*/
+/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
+ gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
+
#include "libguile/__scm.h"
extern long scm_tc16_regex;
#define SCM_RGX(X) ((regex_t *) SCM_CDR(X))
-#define SCM_RGXP(X) (SCM_CAR (X) == (SCM) scm_tc16_regex)
+#define SCM_RGXP(X) (SCM_NIMP(X) && (SCM_CAR (X) == (SCM) scm_tc16_regex))
extern SCM scm_make_regexp SCM_P ((SCM pat, SCM flags));
SCM scm_regexp_p SCM_P ((SCM x));