Mercurial > dropbear

annotate libtommath/bn_mp_init_multi.c @ 284:eed26cff980b

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propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583) to branch 'au.asn.ucc.matt.dropbear' (head fff0894a0399405a9410ea1c6d118f342cf2aa64)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:49 +0000
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children 5ff8218bcee9
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284
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1 #include <tommath.h>
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2 #ifdef BN_MP_INIT_MULTI_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * The library is free for all purposes without any express
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13 * guarantee it works.
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14 *
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15 * Tom St Denis, [email protected], http://math.libtomcrypt.org
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16 */
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17 #include <stdarg.h>
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18
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19 int mp_init_multi(mp_int *mp, ...)
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20 {
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21 mp_err res = MP_OKAY; /* Assume ok until proven otherwise */
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22 int n = 0; /* Number of ok inits */
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23 mp_int* cur_arg = mp;
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24 va_list args;
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25
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26 va_start(args, mp); /* init args to next argument from caller */
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27 while (cur_arg != NULL) {
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28 if (mp_init(cur_arg) != MP_OKAY) {
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29 /* Oops - error! Back-track and mp_clear what we already
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30 succeeded in init-ing, then return error.
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31 */
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32 va_list clean_args;
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33
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34 /* end the current list */
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35 va_end(args);
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36
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37 /* now start cleaning up */
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38 cur_arg = mp;
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39 va_start(clean_args, mp);
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40 while (n--) {
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41 mp_clear(cur_arg);
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42 cur_arg = va_arg(clean_args, mp_int*);
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43 }
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44 va_end(clean_args);
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45 res = MP_MEM;
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46 break;
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47 }
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48 n++;
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49 cur_arg = va_arg(args, mp_int*);
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50 }
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51 va_end(args);
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52 return res; /* Assumed ok, if error flagged above. */
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53 }
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54
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55 #endif