kc3-lang/libtommath/mp_to_sbin.c

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• Hash : 1cc289d2
  Author :
  Date : 2019-11-09T20:23:03
  

  better use of mp_isneg() and mp_iszero()

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• mp_to_sbin.c

• #include "tommath_private.h"
  #ifdef MP_TO_SBIN_C
  /* LibTomMath, multiple-precision integer library -- Tom St Denis */
  /* SPDX-License-Identifier: Unlicense */
  
  /* store in signed [big endian] format */
  mp_err mp_to_sbin(const mp_int *a, uint8_t *buf, size_t maxlen, size_t *written)
  {
     mp_err err;
     if (maxlen == 0u) {
        return MP_BUF;
     }
     if ((err = mp_to_ubin(a, buf + 1, maxlen - 1u, written)) != MP_OKAY) {
        return err;
     }
     if (written != NULL) {
        (*written)++;
     }
     buf[0] = mp_isneg(a) ? (uint8_t)1 : (uint8_t)0;
     return MP_OKAY;
  }
  #endif
  

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