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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> | ||
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| #include "SPMySQLUtilities.h" | ||
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| static errno_t LegacyMemsetS(void *ptr, rsize_t ignored, int value, rsize_t count); | ||
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| 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; | ||
| }); | ||
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| return (*memsetPtr)(cBuffer, cLength, '\0', cLength); | ||
| } | ||
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| /** | ||
| * 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; | ||
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| return 0; | ||
| } |