summaryrefslogtreecommitdiff
path: root/openbsd-compat/reallocarray.c
diff options
context:
space:
mode:
authorDarren Tucker <dtucker@zip.com.au>2014-12-10 01:32:23 +1100
committerDarren Tucker <dtucker@zip.com.au>2014-12-10 01:32:23 +1100
commit642652d280499691c8212ec6b79724b50008ce09 (patch)
treeeac5f60ab7846b0d3050982a4d9d1f3d3b8950ef /openbsd-compat/reallocarray.c
parent3dfd8d93dfcc69261f5af99df56f3ff598581979 (diff)
Add reallocarray to compat library
Diffstat (limited to 'openbsd-compat/reallocarray.c')
-rw-r--r--openbsd-compat/reallocarray.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/openbsd-compat/reallocarray.c b/openbsd-compat/reallocarray.c
new file mode 100644
index 00000000..68f40644
--- /dev/null
+++ b/openbsd-compat/reallocarray.c
@@ -0,0 +1,44 @@
+/* $OpenBSD: reallocarray.c,v 1.1 2014/05/08 21:43:49 deraadt Exp $ */
+/*
+ * Copyright (c) 2008 Otto Moerbeek <otto@drijf.net>
+ *
+ * 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.
+ */
+
+/* OPENBSD ORIGINAL: lib/libc/stdlib/reallocarray.c */
+
+#include "includes.h"
+#ifndef HAVE_REALLOCARRAY
+
+#include <sys/types.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+/*
+ * This is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
+ * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW
+ */
+#define MUL_NO_OVERFLOW (1UL << (sizeof(size_t) * 4))
+
+void *
+reallocarray(void *optr, size_t nmemb, size_t size)
+{
+ if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
+ nmemb > 0 && SIZE_MAX / nmemb < size) {
+ errno = ENOMEM;
+ return NULL;
+ }
+ return realloc(optr, size * nmemb);
+}
+#endif /* HAVE_REALLOCARRAY */