fix usage of some functions

[xonotic/d0_blind_id.git] / d0_bignum-tommath.c

diff --git a/d0_bignum-tommath.c b/d0_bignum-tommath.c
index 414d5af95cc602c019d4adf003e3836a9cd37948..40deef8e852bd9b96f506b7f630371e58d2cf82d 100644 (file)
--- a/d0_bignum-tommath.c
+++ b/d0_bignum-tommath.c
@@ -312,7 +312,7 @@ d0_bignum_t *d0_bignum_mov(d0_bignum_t *r, const d0_bignum_t *a)
        if(r == a)
                return r; // trivial
        if(!r) r = d0_bignum_new(); if(!r) return NULL;
-       mp_copy(&r->z, &a->z);
+       mp_copy(&a->z, &r->z);
        return r;
 }
 
@@ -325,11 +325,13 @@ d0_bignum_t *d0_bignum_neg(d0_bignum_t *r, const d0_bignum_t *a)
 
 d0_bignum_t *d0_bignum_shl(d0_bignum_t *r, const d0_bignum_t *a, ssize_t n)
 {
-       r = d0_bignum_mov(r, a);
+       if(!r) r = d0_bignum_new(); if(!r) return NULL;
        if(n > 0)
-               mp_mul_2d(&r->z,  n, &r->z);
+               mp_mul_2d(&a->z,  n, &r->z);
        else if(n < 0)
-               mp_div_2d(&r->z, -n, &r->z, NULL);
+               mp_div_2d(&a->z, -n, &r->z, NULL);
+       else
+               mp_copy(&a->z, &r->z);
        return r;
 }