Add libnetbsd, a thin compatibility layer intended to allow a limited

set of NetBSD software to compile as part of the FreeBSD build with
little or no modifiction.  It is built as a static library and not
installed for general use.  Likewise, its header files are not
installed.

Sponsored by:	DARPA, AFRL

11 files changed, 589 insertions, 0 deletions

diff --git a/lib/Makefile b/lib/Makefile
index 7c3ccbd..6e1a402 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -90,6 +90,7 @@ SUBDIR=	${SUBDIR_ORDERED} \
 	${_libmilter} \
 	${_libmp} \
 	${_libnandfs} \
+	libnetbsd \
 	${_libngatm} \
 	libopie \
 	libpam \
diff --git a/lib/libnetbsd/Makefile b/lib/libnetbsd/Makefile
new file mode 100644
index 0000000..09c6985
--- /dev/null
+++ b/lib/libnetbsd/Makefile
@@ -0,0 +1,13 @@
+# $FreeBSD$
+
+.include <bsd.own.mk>
+
+LIB=	netbsd
+
+CFLAGS+=	-I${.CURDIR}
+
+SRCS+=	strsuftoll.c util.c util.h
+
+INTERNALLIB=
+
+.include <bsd.lib.mk>
diff --git a/lib/libnetbsd/README b/lib/libnetbsd/README
new file mode 100644
index 0000000..ab30300
--- /dev/null
+++ b/lib/libnetbsd/README
@@ -0,0 +1,7 @@
+$FreeBSD$
+
+libnetbsd is a thin compatibility layer intended to allow a limited
+set of NetBSD software to compile as part of the FreeBSD build with
+little or no modifiction.  It is built as a static library and not
+installed for general use.  Likewise, its header files are not
+installed.
diff --git a/lib/libnetbsd/rmd160.h b/lib/libnetbsd/rmd160.h
new file mode 100644
index 0000000..7b81199
--- /dev/null
+++ b/lib/libnetbsd/rmd160.h
@@ -0,0 +1,44 @@
+/*	$FreeBSD$	 */
+
+/*-
+ * Copyright (c) 2012 SRI International
+ * All rights reserved.
+ *
+ * This software was developed by SRI International and the University of
+ * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
+ * ("CTSRD"), as part of the DARPA CRASH research programme.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _RMD160_H_
+#define _RMD160_H_
+
+#include <ripemd.h>
+
+#define RMD160_CTX	RIPEMD160_CTX
+#define	RMD160End	RIPEMD160_End
+#define	RMD160File	RIPEMD160_File
+#define	RMD160Init	RIPEMD160_Init
+#define	RMD160Update	RIPEMD160_Update
+
+#endif /* _RMD160_H_ */
diff --git a/lib/libnetbsd/sha1.h b/lib/libnetbsd/sha1.h
new file mode 100644
index 0000000..41280c5
--- /dev/null
+++ b/lib/libnetbsd/sha1.h
@@ -0,0 +1,43 @@
+/*	$FreeBSD$	*/
+
+/*-
+ * Copyright (c) 2012 SRI International
+ * All rights reserved.
+ *
+ * This software was developed by SRI International and the University of
+ * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
+ * ("CTSRD"), as part of the DARPA CRASH research programme.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _SHA1_H_
+#define _SHA1_H_
+
+#include <sha.h>
+
+#define	SHA1End		SHA1_End
+#define	SHA1File	SHA1_File
+#define	SHA1Init	SHA1_Init
+#define	SHA1Update	SHA1_Update
+
+#endif /* _SHA1_H_ */
diff --git a/lib/libnetbsd/sha2.h b/lib/libnetbsd/sha2.h
new file mode 100644
index 0000000..b67691d
--- /dev/null
+++ b/lib/libnetbsd/sha2.h
@@ -0,0 +1,39 @@
+/*	$FreeBSD$	*/
+
+/*-
+ * Copyright (c) 2012 SRI International
+ * All rights reserved.
+ *
+ * This software was developed by SRI International and the University of
+ * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
+ * ("CTSRD"), as part of the DARPA CRASH research programme.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _SHA2_H_
+#define _SHA2_H_
+
+#include <sha256.h>
+#include <sha512.h>
+
+#endif /* _SHA2_H_ */
diff --git a/lib/libnetbsd/stdlib.h b/lib/libnetbsd/stdlib.h
new file mode 100644
index 0000000..d481913
--- /dev/null
+++ b/lib/libnetbsd/stdlib.h
@@ -0,0 +1,70 @@
+/* $FreeBSD$ */
+
+/*-
+ * Copyright (c) 2012 SRI International
+ * Copyright (c) 2001-2002,2004 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Luke Mewburn.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/*-
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _LIBNETBSD_STDLIB_H_
+#define _LIBNETBSD_STDLIB_H_
+
+#include_next <stdlib.h>
+
+long long strsuftoll(const char *, const char *, long long, long long);
+long long strsuftollx(const char *, const char *,
+    long long, long long, char *, size_t);
+
+#endif /* _LIBNETBSD_STDLIB_H_ */
diff --git a/lib/libnetbsd/strsuftoll.c b/lib/libnetbsd/strsuftoll.c
new file mode 100644
index 0000000..657e525
--- /dev/null
+++ b/lib/libnetbsd/strsuftoll.c
@@ -0,0 +1,222 @@
+/*	$NetBSD: strsuftoll.c,v 1.6 2004/03/05 05:58:29 lukem Exp $	*/
+/*-
+ * Copyright (c) 2001-2002,2004 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Luke Mewburn.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/*-
+ * Copyright (c) 1991, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Keith Muller of the University of California, San Diego and Lance
+ * Visser of Convex Computer Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/time.h>
+
+#include <assert.h>
+#include <ctype.h>
+#include <err.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef _LIBC
+# ifdef __weak_alias
+__weak_alias(strsuftoll, _strsuftoll)
+__weak_alias(strsuftollx, _strsuftollx)
+# endif
+#endif /* LIBC */
+
+/*
+ * Convert an expression of the following forms to a (u)int64_t.
+ * 	1) A positive decimal number.
+ *	2) A positive decimal number followed by a b (mult by 512).
+ *	3) A positive decimal number followed by a k (mult by 1024).
+ *	4) A positive decimal number followed by a m (mult by 1048576).
+ *	5) A positive decimal number followed by a g (mult by 1073741824).
+ *	6) A positive decimal number followed by a t (mult by 1099511627776).
+ *	7) A positive decimal number followed by a w (mult by sizeof int)
+ *	8) Two or more positive decimal numbers (with/without k,b or w).
+ *	   separated by x (also * for backwards compatibility), specifying
+ *	   the product of the indicated values.
+ * Returns the result upon successful conversion, or exits with an
+ * appropriate error.
+ * 
+ */
+
+/*
+ * As strsuftoll(), but returns the error message into the provided buffer
+ * rather than exiting with it.
+ */
+/* LONGLONG */
+long long
+strsuftollx(const char *desc, const char *val,
+    long long min, long long max, char *ebuf, size_t ebuflen)
+{
+	long long num, t;
+	char	*expr;
+
+	errno = 0;
+	ebuf[0] = '\0';
+
+	while (isspace((unsigned char)*val))	/* Skip leading space */
+		val++;
+
+	num = strtoll(val, &expr, 10);
+	if (errno == ERANGE)
+		goto erange;			/* Overflow */
+
+	if (expr == val)			/* No digits */
+		goto badnum;
+
+	switch (*expr) {
+	case 'b':
+		t = num;
+		num *= 512;			/* 1 block */
+		if (t > num)
+			goto erange;
+		++expr;
+		break;
+	case 'k':
+		t = num;
+		num *= 1024;			/* 1 kilobyte */
+		if (t > num)
+			goto erange;
+		++expr;
+		break;
+	case 'm':
+		t = num;
+		num *= 1048576;			/* 1 megabyte */
+		if (t > num)
+			goto erange;
+		++expr;
+		break;
+	case 'g':
+		t = num;
+		num *= 1073741824;		/* 1 gigabyte */
+		if (t > num)
+			goto erange;
+		++expr;
+		break;
+	case 't':
+		t = num;
+		num *= 1099511627776LL;		/* 1 terabyte */
+		if (t > num)
+			goto erange;
+		++expr;
+		break;
+	case 'w':
+		t = num;
+		num *= sizeof(int);		/* 1 word */
+		if (t > num)
+			goto erange;
+		++expr;
+		break;
+	}
+
+	switch (*expr) {
+	case '\0':
+		break;
+	case '*':				/* Backward compatible */
+	case 'x':
+		t = num;
+		num *= strsuftollx(desc, expr + 1, min, max, ebuf, ebuflen);
+		if (*ebuf != '\0')
+			return (0);
+		if (t > num) {
+ erange:	 	
+			snprintf(ebuf, ebuflen,
+			    "%s: %s", desc, strerror(ERANGE));
+			return (0);
+		}
+		break;
+	default:
+ badnum:	snprintf(ebuf, ebuflen,
+		    "%s `%s': illegal number", desc, val);
+		return (0);
+	}
+	if (num < min) {
+			/* LONGLONG */
+		snprintf(ebuf, ebuflen, "%s %lld is less than %lld.",
+		    desc, (long long)num, (long long)min);
+		return (0);
+	}
+	if (num > max) {
+			/* LONGLONG */
+		snprintf(ebuf, ebuflen,
+		    "%s %lld is greater than %lld.",
+		    desc, (long long)num, (long long)max);
+		return (0);
+	}
+	*ebuf = '\0';
+	return (num);
+}
+
+/* LONGLONG */
+long long
+strsuftoll(const char *desc, const char *val,
+    long long min, long long max)
+{
+	long long result;
+	char	errbuf[100];
+
+	result = strsuftollx(desc, val, min, max, errbuf, sizeof(errbuf));
+	if (*errbuf != '\0')
+		errx(1, "%s", errbuf);
+	return (result);
+}
diff --git a/lib/libnetbsd/sys/cdefs.h b/lib/libnetbsd/sys/cdefs.h
new file mode 100644
index 0000000..09a7ca4
--- /dev/null
+++ b/lib/libnetbsd/sys/cdefs.h
@@ -0,0 +1,50 @@
+/* $FreeBSD$ */
+
+/*-
+ * Copyright (c) 2012 SRI International
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _LIBNETBSD_SYS_CDEFS_H_
+#define _LIBNETBSD_SYS_CDEFS_H_
+
+#include_next <sys/cdefs.h>
+
+#ifdef __dead2
+#define __dead __dead2
+#else
+#define __dead
+#endif
+
+/*
+ * Return the number of elements in a statically-allocated array,
+ * __x.
+ */
+#define	__arraycount(__x)	(sizeof(__x) / sizeof(__x[0]))
+
+#endif /* _LIBNETBSD_SYS_CDEFS_H_ */
diff --git a/lib/libnetbsd/util.c b/lib/libnetbsd/util.c
new file mode 100644
index 0000000..36b9421
--- /dev/null
+++ b/lib/libnetbsd/util.c
@@ -0,0 +1,59 @@
+/*-
+ * Copyright (c) 2012 SRI International
+ * All rights reserved.
+ *
+ * This software was developed by SRI International and the University of
+ * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
+ * ("CTSRD"), as part of the DARPA CRASH research programme.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <util.h>
+
+char *
+flags_to_string(u_long flags, const char *def)
+{
+	char *str;
+
+	str = fflagstostr(flags);
+	if (*str == '\0') {
+		free(str);
+		str = strdup(def);
+	}
+	return (str);
+}
+
+int
+string_to_flags(char **stringp, u_long *setp, u_long *clrp)
+{
+
+	return strtofflags(stringp, setp, clrp);
+}
diff --git a/lib/libnetbsd/util.h b/lib/libnetbsd/util.h
new file mode 100644
index 0000000..c7d32e1
--- /dev/null
+++ b/lib/libnetbsd/util.h
@@ -0,0 +1,41 @@
+/*	$FreeBSD$	*/
+
+/*-
+ * Copyright (c) 2012 SRI International
+ * Copyright (c) 1995
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _UTIL_H_
+#define _UTIL_H_
+
+#include <libutil.h>
+
+char	*flags_to_string(u_long flags, const char *def);
+int	 string_to_flags(char **stringp, u_long *setp, u_long *clrp);
+
+#endif	/* _UTIL_H_ */