31 lines
708 B
C
31 lines
708 B
C
#include "tommath_private.h"
|
|
#ifdef BN_MP_INCR_C
|
|
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
|
|
/* SPDX-License-Identifier: Unlicense */
|
|
|
|
/* Increment "a" by one like "a++". Changes input! */
|
|
int mp_incr(mp_int *a)
|
|
{
|
|
int e = MP_OKAY;
|
|
if (MP_IS_ZERO(a)) {
|
|
mp_set(a,1uL);
|
|
return MP_OKAY;
|
|
} else if (a->sign == MP_NEG) {
|
|
a->sign = MP_ZPOS;
|
|
if ((e = mp_decr(a)) != MP_OKAY) {
|
|
return e;
|
|
}
|
|
/* There is no -0 in LTM */
|
|
if (!MP_IS_ZERO(a)) {
|
|
a->sign = MP_NEG;
|
|
}
|
|
return MP_OKAY;
|
|
} else if (a->dp[0] < MP_MASK) {
|
|
a->dp[0]++;
|
|
return MP_OKAY;
|
|
} else {
|
|
return mp_add_d(a, 1uL,a);
|
|
}
|
|
}
|
|
#endif
|