Mercurial > dropbear
comparison libtommath/bn_mp_incr.c @ 1739:13d834efc376 fuzz
merge from main
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 15 Oct 2020 19:55:15 +0800 |
parents | 1051e4eea25a |
children |
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1562:768ebf737aa0 | 1739:13d834efc376 |
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1 #include "tommath_private.h" | |
2 #ifdef BN_MP_INCR_C | |
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */ | |
4 /* SPDX-License-Identifier: Unlicense */ | |
5 | |
6 /* Increment "a" by one like "a++". Changes input! */ | |
7 mp_err mp_incr(mp_int *a) | |
8 { | |
9 if (MP_IS_ZERO(a)) { | |
10 mp_set(a,1uL); | |
11 return MP_OKAY; | |
12 } else if (a->sign == MP_NEG) { | |
13 mp_err err; | |
14 a->sign = MP_ZPOS; | |
15 if ((err = mp_decr(a)) != MP_OKAY) { | |
16 return err; | |
17 } | |
18 /* There is no -0 in LTM */ | |
19 if (!MP_IS_ZERO(a)) { | |
20 a->sign = MP_NEG; | |
21 } | |
22 return MP_OKAY; | |
23 } else if (a->dp[0] < MP_DIGIT_MAX) { | |
24 a->dp[0]++; | |
25 return MP_OKAY; | |
26 } else { | |
27 return mp_add_d(a, 1uL,a); | |
28 } | |
29 } | |
30 #endif |