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SPMySQLUtilities.m
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SPMySQLUtilities.m
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//
// 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;
}