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annotate libtommath/bn_mp_init_multi.c @ 1167:1397a677cb5c

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lazy allocation of circbuffer
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Nov 2015 23:52:11 +0800
parents 5ff8218bcee9
children 60fc6476e044
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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.com
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16 */
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17 #include <stdarg.h>
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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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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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34 /* end the current list */
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35 va_end(args);
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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
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57 /* $Source: /cvs/libtom/libtommath/bn_mp_init_multi.c,v $ */
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58 /* $Revision: 1.3 $ */
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59 /* $Date: 2006/03/31 14:18:44 $ */