src/lib/safe-memset.c

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bcb4e51a409d94ae670de96afb8483a4f7855294Stephan Bosch/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
2a6f72a80e2c6e410e1128dd6beb4ea950b3839eTimo Sirainen
2a6f72a80e2c6e410e1128dd6beb4ea950b3839eTimo Sirainen#include "lib.h"
2a6f72a80e2c6e410e1128dd6beb4ea950b3839eTimo Sirainen#include "safe-memset.h"
2a6f72a80e2c6e410e1128dd6beb4ea950b3839eTimo Sirainen
2a6f72a80e2c6e410e1128dd6beb4ea950b3839eTimo Sirainenvoid safe_memset(void *data, int c, size_t size)
2a6f72a80e2c6e410e1128dd6beb4ea950b3839eTimo Sirainen{
b13a8e19e0b6444e21cb43bb76460c39f9949cd0Timo Sirainen    volatile unsigned int volatile_zero_idx = 0;
2a6f72a80e2c6e410e1128dd6beb4ea950b3839eTimo Sirainen    volatile unsigned char *p = data;
2a6f72a80e2c6e410e1128dd6beb4ea950b3839eTimo Sirainen
2262531bc5fe37a8675b430cc5aae10ee397cb4dTimo Sirainen    if (size == 0)
2262531bc5fe37a8675b430cc5aae10ee397cb4dTimo Sirainen        return;
2262531bc5fe37a8675b430cc5aae10ee397cb4dTimo Sirainen
b13a8e19e0b6444e21cb43bb76460c39f9949cd0Timo Sirainen    do {
b13a8e19e0b6444e21cb43bb76460c39f9949cd0Timo Sirainen        memset(data, c, size);
b13a8e19e0b6444e21cb43bb76460c39f9949cd0Timo Sirainen    } while (p[volatile_zero_idx] != c);
2a6f72a80e2c6e410e1128dd6beb4ea950b3839eTimo Sirainen}