tommath/bn_mp_shrink.c

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#include <tommath_private.h>
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#ifdef BN_MP_SHRINK_C
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/* LibTomMath, multiple-precision integer library -- Tom St Denis
*
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* LibTomMath is a library that provides multiple-precision
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* integer arithmetic as well as number theoretic functionality.
*
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* The library was designed directly after the MPI library by
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* Michael Fromberger but has been written from scratch with
* additional optimizations in place.
*
* The library is free for all purposes without any express
* guarantee it works.
*
* Tom St Denis, tstdenis82@gmail.com, http://libtom.org
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*/
/* shrink a bignum */
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int mp_shrink (mp_int * a)
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{
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mp_digit *tmp;
int used = 1;
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if(a->used > 0) {
used = a->used;
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}
if (a->alloc != used) {
if ((tmp = OPT_CAST(mp_digit) XREALLOC (a->dp, sizeof (mp_digit) * used)) == NULL) {
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return MP_MEM;
}
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a->dp = tmp;
a->alloc = used;
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}
return MP_OKAY;
}
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#endif
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/* ref: $Format:%D$ */
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