1 files changed, 95 insertions, 0 deletions
diff --git a/libc/upstream-netbsd/libc/stdlib/reallocarr.c b/libc/upstream-netbsd/libc/stdlib/reallocarr.c
new file mode 100644
index 0000000..6ffe811
--- /dev/null
+++ b/libc/upstream-netbsd/libc/stdlib/reallocarr.c
@@ -0,0 +1,95 @@
+/* $NetBSD: reallocarr.c,v 1.5 2015/08/20 22:27:49 kamil Exp $ */
+
+/*-
+ * Copyright (c) 2015 Joerg Sonnenberger <joerg@NetBSD.org>.
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
+ * COPYRIGHT HOLDERS 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.
+ */
+
+#if HAVE_NBTOOL_CONFIG_H
+#include "nbtool_config.h"
+#endif
+
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: reallocarr.c,v 1.5 2015/08/20 22:27:49 kamil Exp $");
+
+#include "namespace.h"
+#include <errno.h>
+/* Old POSIX has SIZE_MAX in limits.h */
+#include <limits.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef _LIBC
+#ifdef __weak_alias
+__weak_alias(reallocarr, _reallocarr)
+#endif
+#endif
+
+#define SQRT_SIZE_MAX (((size_t)1) << (sizeof(size_t) * CHAR_BIT / 2))
+
+#if !HAVE_REALLOCARR
+int
+reallocarr(void *ptr, size_t number, size_t size)
+{
+	int saved_errno, result;
+	void *optr;
+	void *nptr;
+
+	saved_errno = errno;
+	memcpy(&optr, ptr, sizeof(ptr));
+	if (number == 0 || size == 0) {
+		free(optr);
+		nptr = NULL;
+		memcpy(ptr, &nptr, sizeof(ptr));
+		errno = saved_errno;
+		return 0;
+	}
+
+	/*
+	 * Try to avoid division here.
+	 *
+	 * It isn't possible to overflow during multiplication if neither
+	 * operand uses any of the most significant half of the bits.
+	 */
+	if (__predict_false((number|size) >= SQRT_SIZE_MAX &&
+	                    number > SIZE_MAX / size)) {
+		errno = saved_errno;
+		return EOVERFLOW;
+	}
+
+	nptr = realloc(optr, number * size);
+	if (__predict_false(nptr == NULL)) {
+		result = errno;
+	} else {
+		result = 0;
+		memcpy(ptr, &nptr, sizeof(ptr));
+	}
+	errno = saved_errno;
+	return result;
+}
+#endif