Add reallocarray to utility functions

From OpenBSD, dependency of newer versions of glob.

Author: NattyNarwhal

configure.ac

@@ -689,7 +689,7 @@ AS_VAR_IF([php_cv_func_copy_file_range], [yes],
   [AC_DEFINE([HAVE_COPY_FILE_RANGE], [1],
     [Define to 1 if you have the 'copy_file_range' function.])])
 
-AC_REPLACE_FUNCS([strlcat strlcpy explicit_bzero getopt])
+AC_REPLACE_FUNCS([strlcat strlcpy reallocarray explicit_bzero getopt])
 AC_FUNC_ALLOCA
 PHP_TIME_R_TYPE
 
@@ -1638,6 +1638,7 @@ PHP_ADD_SOURCES([main], m4_normalize([
     php_ticks.c
     php_variables.c
     reentrancy.c
+    reallocarray.c
     rfc1867.c
     safe_bcmp.c
     SAPI.c

main/php.h

@@ -172,6 +172,14 @@ END_EXTERN_C()
 #define explicit_bzero php_explicit_bzero
 #endif
 
+#ifndef HAVE_REALLOCARRAY
+BEGIN_EXTERN_C()
+PHPAPI void *php_reallocarray(void *optr, size_t nmemb, size_t size);
+END_EXTERN_C()
+#undef reallocarray
+#define reallocarray php_reallocarray
+#endif
+
 BEGIN_EXTERN_C()
 PHPAPI int php_safe_bcmp(const zend_string *a, const zend_string *b);
 END_EXTERN_C()

main/reallocarray.c

@@ -0,0 +1,59 @@
+/*
+  +----------------------------------------------------------------------+
+  | Copyright (c) The PHP Group                                          |
+  +----------------------------------------------------------------------+
+  | This source file is subject to version 3.01 of the PHP license,      |
+  | that is bundled with this package in the file LICENSE, and is        |
+  | available through the world-wide-web at the following url:           |
+  | https://www.php.net/license/3_01.txt                                 |
+  | If you did not receive a copy of the PHP license and are unable to   |
+  | obtain it through the world-wide-web, please send a note to          |
+  | license@php.net so we can mail you a copy immediately.               |
+  +----------------------------------------------------------------------+
+  | Author:                                                              |
+  +----------------------------------------------------------------------+
+*/
+
+#include "php.h"
+
+#ifdef USE_REALLOCARRAY_PHP_IMPL
+/*	$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>
+
+/*
+ * 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))
+
+PHPAPI void *
+php_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 */

win32/build/config.w32

@@ -284,7 +284,7 @@ if (VS_TOOLSET && VCVERS >= 1914) {
 //AC_DEFINE('ZEND_DVAL_TO_LVAL_CAST_OK', 1);
 
 ADD_SOURCES("main", "main.c snprintf.c spprintf.c getopt.c fopen_wrappers.c \
-	php_ini_builder.c \
+	php_ini_builder.c reallocarray.c \
 	php_scandir.c php_ini.c SAPI.c rfc1867.c php_content_types.c strlcpy.c \
 	strlcat.c reentrancy.c php_variables.c php_ticks.c network.c \
 	php_open_temporary_file.c output.c internal_functions.c \