add regression tests for memmem(3)

regress/lib/libc/string/Makefile

@@ -1,5 +1,5 @@
-# $NetBSD: Makefile,v 1.4 2005/03/13 15:33:45 perry Exp $
+# $NetBSD: Makefile,v 1.5 2005/03/13 15:40:32 perry Exp $
 
-SUBDIR+= swab
+SUBDIR+= memmem swab
 
 .include <bsd.subdir.mk>

regress/lib/libc/string/memmem/Makefile

@@ -0,0 +1,11 @@
+#	$NetBSD: Makefile,v 1.1 2005/03/13 15:40:32 perry Exp $
+
+NOMAN=		# defined
+
+PROG=		memmem_test
+WARNS?=		3
+
+regress: ${PROG}
+	./${PROG}
+
+.include <bsd.prog.mk>

regress/lib/libc/string/memmem/memmem_test.c

@@ -0,0 +1,91 @@
+/*	$NetBSD: memmem_test.c,v 1.1 2005/03/13 15:40:32 perry Exp $	*/
+
+/*-
+ * Copyright (c) 2005 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Perry E. Metzger of Metzger, Dowdeswell & Co. LLC.
+ *
+ * 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 the NetBSD
+ *	Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+char p0[] = "";
+int lp0 = 0;
+char p1[] = "0123";
+int lp1 = 4;
+char p2[] = "456";
+int lp2 = 3;
+char p3[] = "789";
+int lp3 = 3;
+char p4[] = "abc";
+int lp4 = 3;
+char p5[] = "0";
+int lp5 = 1;
+char p6[] = "9";
+int lp6 = 1;
+char p7[] = "654";
+int lp7 = 3;
+
+char b0[] = "";
+int lb0 = 0;
+char b1[] = "0";
+int lb1 = 1;
+char b2[] = "0123456789";
+int lb2 = 10;
+
+#define expect(b) if (!(b)) { \
+			fprintf(stderr, "failed on line %d\n", __LINE__); \
+			exit(1); \
+		  }
+
+int
+main(int argc, char **argv)
+{
+	expect(memmem(b2, lb2, p0, lp0) == b2);
+	expect(memmem(b0, lb0, p0, lp0) == b0);
+	expect(memmem(b0, lb0, p1, lp1) == NULL);
+	expect(memmem(b1, lb1, p1, lp1) == NULL);
+
+	expect(memmem(b2, lb2, p1, lp1) == b2);
+	expect(memmem(b2, lb2, p2, lp2) == (b2 + 4));
+	expect(memmem(b2, lb2, p3, lp3) == (b2 + 7));
+
+	expect(memmem(b2, lb2, p5, lp5) == b2);
+	expect(memmem(b2, lb2, p6, lp6) == (b2 + 9));
+
+	expect(memmem(b2, lb2, p4, lp4) == NULL);
+	expect(memmem(b2, lb2, p7, lp7) == NULL);
+
+	exit(0);
+}