1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */ 2 /* util/support/zap.c */ 3 /* 4 * Copyright 2009 Massachusetts Institute of Technology. 5 * All Rights Reserved. 6 * 7 * Export of this software from the United States of America may 8 * require a specific license from the United States Government. 9 * It is the responsibility of any person or organization contemplating 10 * export to obtain such a license before exporting. 11 * 12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 13 * distribute this software and its documentation for any purpose and 14 * without fee is hereby granted, provided that the above copyright 15 * notice appear in all copies and that both that copyright notice and 16 * this permission notice appear in supporting documentation, and that 17 * the name of M.I.T. not be used in advertising or publicity pertaining 18 * to distribution of the software without specific, written prior 19 * permission. Furthermore if you modify this software you must label 20 * your software as modified software and not distribute it in such a 21 * fashion that it might be confused with the original M.I.T. software. 22 * M.I.T. makes no representations about the suitability of 23 * this software for any purpose. It is provided "as is" without express 24 * or implied warranty. 25 */ 26 27 /* 28 * krb5int_zap() is used by zap() (a macro or static inline function defined in 29 * k5-platform.h) on non-Windows, non-gcc compilers, in order to prevent the 30 * compiler from inlining and optimizing out the memset() call. 31 */ 32 33 #include <k5-platform.h> 34 35 void krb5int_zap(void *ptr, size_t len) 36 { 37 volatile char *p = ptr; 38 39 while (len--) 40 *p++ = '\0'; 41 } 42