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      1 /*	$NetBSD: bn_mp_init_multi.c,v 1.2 2017/01/28 21:31:47 christos Exp $	*/
      2 
      3 #include <tommath.h>
      4 #ifdef BN_MP_INIT_MULTI_C
      5 /* LibTomMath, multiple-precision integer library -- Tom St Denis
      6  *
      7  * LibTomMath is a library that provides multiple-precision
      8  * integer arithmetic as well as number theoretic functionality.
      9  *
     10  * The library was designed directly after the MPI library by
     11  * Michael Fromberger but has been written from scratch with
     12  * additional optimizations in place.
     13  *
     14  * The library is free for all purposes without any express
     15  * guarantee it works.
     16  *
     17  * Tom St Denis, tomstdenis (at) gmail.com, http://libtom.org
     18  */
     19 #include <stdarg.h>
     20 
     21 int mp_init_multi(mp_int *mp, ...)
     22 {
     23     mp_err res = MP_OKAY;      /* Assume ok until proven otherwise */
     24     int n = 0;                 /* Number of ok inits */
     25     mp_int* cur_arg = mp;
     26     va_list args;
     27 
     28     va_start(args, mp);        /* init args to next argument from caller */
     29     while (cur_arg != NULL) {
     30         if (mp_init(cur_arg) != MP_OKAY) {
     31             /* Oops - error! Back-track and mp_clear what we already
     32                succeeded in init-ing, then return error.
     33             */
     34             va_list clean_args;
     35 
     36             /* end the current list */
     37             va_end(args);
     38 
     39             /* now start cleaning up */
     40             cur_arg = mp;
     41             va_start(clean_args, mp);
     42             while (n--) {
     43                 mp_clear(cur_arg);
     44                 cur_arg = va_arg(clean_args, mp_int*);
     45             }
     46             va_end(clean_args);
     47             res = MP_MEM;
     48             break;
     49         }
     50         n++;
     51         cur_arg = va_arg(args, mp_int*);
     52     }
     53     va_end(args);
     54     return res;                /* Assumed ok, if error flagged above. */
     55 }
     56 
     57 #endif
     58 
     59 /* Source: /cvs/libtom/libtommath/bn_mp_init_multi.c,v  */
     60 /* Revision: 1.4  */
     61 /* Date: 2006/12/28 01:25:13  */
     62