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diff --git a/src/util/alldig.c b/src/util/alldig.c
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+/*++
+/* NAME
+/* alldig 3
+/* SUMMARY
+/* predicate if string is all numerical
+/* SYNOPSIS
+/* #include <stringops.h>
+/*
+/* int alldig(string)
+/* const char *string;
+/* DESCRIPTION
+/* alldig() determines if its argument is an all-numerical string.
+/* SEE ALSO
+/* An alldig() routine appears in Brian W. Kernighan, P.J. Plauger:
+/* "Software Tools", Addison-Wesley 1976.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <ctype.h>
+
+/* Utility library. */
+
+#include <stringops.h>
+
+/* alldig - return true if string is all digits */
+
+int alldig(const char *string)
+{
+ const char *cp;
+
+ if (*string == 0)
+ return (0);
+ for (cp = string; *cp != 0; cp++)
+ if (!ISDIGIT(*cp))
+ return (0);
+ return (1);
+}