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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include <stddef.h>
#ifdef SD_BOOT
# include "efi-string.h"
#else
# include <string.h>
#endif
#include "macro-fundamental.h"
#if defined(HAVE_EXPLICIT_BZERO)
static inline void *explicit_bzero_safe(void *p, size_t l) {
if (p && l > 0)
explicit_bzero(p, l);
return p;
}
#else
static inline void *explicit_bzero_safe(void *p, size_t l) {
if (p && l > 0) {
memset(p, 0, l);
__asm__ __volatile__("" : : "r"(p) : "memory");
}
return p;
}
#endif
struct VarEraser {
void *p;
size_t size;
};
static inline void erase_var(struct VarEraser *e) {
explicit_bzero_safe(e->p, e->size);
}
/* Mark var to be erased when leaving scope. */
#define CLEANUP_ERASE(var) \
_cleanup_(erase_var) _unused_ struct VarEraser CONCATENATE(_eraser_, UNIQ) = { .p = &var, .size = sizeof(var) }
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