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authorNicholas Marriott <nicholas.marriott@gmail.com>2015-11-18 12:54:29 +0000
committerNicholas Marriott <nicholas.marriott@gmail.com>2015-11-18 12:54:29 +0000
commita77960c540b6ee27ad5538a638ae3615cd025539 (patch)
tree7b5f3bfc26c9b9b8cf42669c2b1a204ce1b3ac5e /compat
parent349a62ed4f6ece8a5cf5fd332ba7c9a75777ccb3 (diff)
Add reallocarray to compat.
Diffstat (limited to 'compat')
-rw-r--r--compat/reallocarray.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/compat/reallocarray.c b/compat/reallocarray.c
new file mode 100644
index 00000000..f4705fcd
--- /dev/null
+++ b/compat/reallocarray.c
@@ -0,0 +1,40 @@
+/* $OpenBSD: reallocarray.c,v 1.3 2015/09/13 08:31:47 guenther 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.
+ */
+
+#include <sys/types.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "tmux.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 ((size_t)1 << (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);
+}