s_mp_zero_buf.c

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Hash : 795cd201
Author :
Date : 2019-10-29T21:48:50

simplifications: add s_mp_zero_(digs|buf) and s_mp_copy_digs Originally I made those as macros. However we have many other small functions like mp_clamp, mp_exch which are also not implemented as macros right now. If we would use c99, I would implement them as private static inline functions. And mp_exch would be a public static inline function. But since we are bound to c89, we simply use normal functions. To achieve optimal performance one should either use link time optimization or amalgamation.

s_mp_zero_buf.c

#include "tommath_private.h"
#ifdef S_MP_ZERO_BUF_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */

#ifdef MP_USE_MEMOPS
#  include <string.h>
#endif

void s_mp_zero_buf(void *mem, size_t size)
{
#ifdef MP_USE_MEMOPS
   memset(mem, 0, size);
#else
   char *m = (char *)mem;
   while (size-- > 0u) {
      *m++ = '\0';
   }
#endif
}

#endif

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s_mp_zero_buf.c