Add basic regression tests for strchr() and strrchr().

regress/lib/libc/Makefile

@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile,v 1.56 2020/06/26 20:16:21 naddy Exp $
+#	$OpenBSD: Makefile,v 1.57 2021/07/24 05:45:49 visa Exp $
 
 SUBDIR+= _setjmp
 SUBDIR+= alloca arc4random-fork atexit
@@ -18,7 +18,7 @@ SUBDIR+= popen printf
 SUBDIR+= qsort
 SUBDIR+= regex
 SUBDIR+= setjmp setjmp-signal sigsetjmp sigthr sleep sprintf stdio_threading
-SUBDIR+= stpncpy strerror strlcat strlcpy strnlen strtod strtol strtonum
+SUBDIR+= stpncpy strchr strerror strlcat strlcpy strnlen strtod strtol strtonum
 SUBDIR+= sys
 SUBDIR+= telldir time timingsafe
 SUBDIR+= vis

regress/lib/libc/strchr/Makefile

@@ -0,0 +1,8 @@
+#	$OpenBSD: Makefile,v 1.1 2021/07/24 05:45:49 visa Exp $
+
+PROG=		strchrtest
+
+CFLAGS+=	-fno-builtin-strchr
+CFLAGS+=	-fno-builtin-strrchr
+
+.include <bsd.regress.mk>

regress/lib/libc/strchr/strchrtest.c

@@ -0,0 +1,69 @@
+/*	$OpenBSD: strchrtest.c,v 1.1 2021/07/24 05:45:49 visa Exp $	*/
+
+/*
+ * Copyright (c) 2021 Visa Hankala
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+int
+main(void)
+{
+	char *buf;
+	size_t bufsize;
+
+	/* Enable malloc security options. */
+	setenv("MALLOC_OPTIONS", "S", 0);
+
+	/* Allocate buffer with guard pages. */
+	bufsize = getpagesize();
+	buf = malloc(bufsize);
+	if (buf == NULL) {
+		fprintf(stderr, "unable to allocate memory\n");
+		return 1;
+	}
+
+	memset(buf, 0, bufsize);
+	assert(strchr(buf, 'a') == NULL);
+	assert(strchr(buf, '\0') == buf);
+	assert(strrchr(buf, 'a') == NULL);
+	assert(strrchr(buf, '\0') == buf);
+
+	memcpy(buf, "haystack\xcf\x80", 10);
+	assert(strchr(buf, 'a') == buf + 1);
+	assert(strchr(buf, '\x80') == buf + 9);
+	assert(strchr(buf, 0x180) == buf + 9);
+	assert(strchr(buf, '\0') == buf + 10);
+	assert(strrchr(buf, 'a') == buf + 5);
+	assert(strrchr(buf, '\xcf') == buf + 8);
+	assert(strrchr(buf, 0x3cf) == buf + 8);
+	assert(strrchr(buf, '\0') == buf + 10);
+
+	memset(buf, 'a', bufsize - 2);
+	buf[0] = 'b';
+	buf[bufsize - 2] = 'b';
+	assert(strchr(buf, 'b') == buf);
+	assert(strchr(buf, 'c') == NULL);
+	assert(strchr(buf, '\0') == buf + bufsize - 1);
+	assert(strrchr(buf, 'b') == buf + bufsize - 2);
+	assert(strrchr(buf, 'c') == NULL);
+	assert(strrchr(buf, '\0') == buf + bufsize - 1);
+
+	return 0;
+}