From NetBSD (lukem and christos):

A stringlist implementation (previously ``private'' to libc netgroup code,
but christos ok-ed making public as it's useful)

src/include/Makefile

@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile,v 1.34 1996/12/22 06:29:00 deraadt Exp $
+#	$OpenBSD: Makefile,v 1.35 1997/02/02 23:18:43 millert Exp $
 #	$NetBSD: Makefile,v 1.59 1996/05/15 21:36:43 jtc Exp $
 
 #	@(#)Makefile	5.45.1.1 (Berkeley) 5/6/91
@@ -14,7 +14,7 @@ FILES=	a.out.h ar.h assert.h bitstring.h bm.h cpio.h ctype.h db.h dirent.h \
 	malloc.h math.h md4.h md5.h memory.h mpool.h ndbm.h netdb.h \
 	netgroup.h nlist.h nl_types.h olf_abi.h paths.h poll.h pwd.h \
 	ranlib.h re_comp.h regex.h resolv.h search.h setjmp.h sgtty.h \
-	sha1.h signal.h stab.h stddef.h stdio.h stdlib.h string.h \
+	sha1.h signal.h stab.h stddef.h stdio.h stdlib.h string.h stringlist.h \
 	strings.h struct.h sysexits.h tar.h time.h ttyent.h tzfile.h \
 	unistd.h utime.h utmp.h vis.h
 

src/include/stringlist.h

@@ -0,0 +1,57 @@
+/*	$OpenBSD: stringlist.h,v 1.1 1997/02/02 23:18:44 millert Exp $	*/
+/*	$NetBSD: stringlist.h,v 1.2 1997/01/17 06:11:36 lukem Exp $	*/
+
+/*
+ * Copyright (c) 1994 Christos Zoulas
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by Christos Zoulas.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 _STRINGLIST_H
+#define _STRINGLIST_H 
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+/*
+ * Simple string list
+ */
+typedef struct _stringlist {
+	char	**sl_str;
+	size_t	  sl_max;
+	size_t	  sl_cur;
+} StringList;
+
+__BEGIN_DECLS
+StringList *sl_init	__P((void));
+void	 sl_add		__P((StringList *, char *));
+void	 sl_free	__P((StringList *, int));
+char	*sl_find	__P((StringList *, char *));
+__END_DECLS
+
+#endif /* _STRINGLIST_H */