1 files changed, 66 insertions, 0 deletions
diff --git a/Frameworks/SPMySQLFramework/Source/SPMySQLUtilities.m b/Frameworks/SPMySQLFramework/Source/SPMySQLUtilities.m
new file mode 100644
index 00000000..3d147143
--- /dev/null
+++ b/Frameworks/SPMySQLFramework/Source/SPMySQLUtilities.m
@@ -0,0 +1,66 @@
+//
+//  SPMySQLUtilities.c
+//  SPMySQLFramework
+//
+//  Created by Max Lohrmann on 25.02.2018
+//  Copyright (c) 2018 Max Lohrmann. All rights reserved.
+//
+//  Permission is hereby granted, free of charge, to any person
+//  obtaining a copy of this software and associated documentation
+//  files (the "Software"), to deal in the Software without
+//  restriction, including without limitation the rights to use,
+//  copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the
+//  Software is furnished to do so, subject to the following
+//  conditions:
+//
+//  The above copyright notice and this permission notice shall be
+//  included in all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+//  OTHER DEALINGS IN THE SOFTWARE.
+//
+//  More info at <https://github.com/sequelpro/sequelpro>
+
+#include <errno.h>
+#define __STDC_WANT_LIB_EXT1__ 1
+#include <string.h>
+#include <dlfcn.h>
+#include <dispatch/dispatch.h>
+
+#include "SPMySQLUtilities.h"
+
+static errno_t LegacyMemsetS(void *ptr, rsize_t ignored, int value, rsize_t count);
+
+errno_t SPMySQLSafeEraseMemory(void *cBuffer, size_t cLength) {
+	// memset_s is 10.9+ only - if we added a link time dependency, SP wouldn't launch on older targets
+	static errno_t (*memsetPtr)(void *, rsize_t, int, rsize_t);
+	static dispatch_once_t findMemsetToken;
+	dispatch_once(&findMemsetToken, ^{
+		memsetPtr = dlsym(RTLD_DEFAULT, "memset_s");
+		if(!memsetPtr) memsetPtr = &LegacyMemsetS;
+	});
+
+	return (*memsetPtr)(cBuffer, cLength, '\0', cLength);
+}
+
+/**
+ * This function tries to emulate the important (to us) parts
+ * of memset_s on pre 10.9 systems.
+ *
+ * The implementation is taken from the original memset_s proposal:
+ *   http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1381.pdf
+ */
+errno_t LegacyMemsetS(void *s, rsize_t smax __attribute__((unused)), int c, rsize_t n)
+{
+	volatile unsigned char * addr = (volatile unsigned char *)s;
+	while(n--) *addr++ = (unsigned char)c;
+
+	return 0;
+}