release/src/router/dropbear/libtommath/bn_mp_init_multi.c

   1 #include <tommath.h>
   2 #ifdef BN_MP_INIT_MULTI_C
   3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
   4  *
   5  * LibTomMath is a library that provides multiple-precision
   6  * integer arithmetic as well as number theoretic functionality.
   7  *
   8  * The library was designed directly after the MPI library by
   9  * Michael Fromberger but has been written from scratch with
  10  * additional optimizations in place.
  11  *
  12  * The library is free for all purposes without any express
  13  * guarantee it works.
  14  *
  15  * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com
  16  */
  17 #include <stdarg.h>
  18
  19 int mp_init_multi(mp_int *mp, ...)
  20 {
  21     mp_err res = MP_OKAY;      /* Assume ok until proven otherwise */
  22     int n = 0;                 /* Number of ok inits */
  23     mp_int* cur_arg = mp;
  24     va_list args;
  25
  26     va_start(args, mp);        /* init args to next argument from caller */
  27     while (cur_arg != NULL) {
  28         if (mp_init(cur_arg) != MP_OKAY) {
  29             /* Oops - error! Back-track and mp_clear what we already
  30                succeeded in init-ing, then return error.
  31             */
  32             va_list clean_args;
  33
  34             /* end the current list */
  35             va_end(args);
  36
  37             /* now start cleaning up */
  38             cur_arg = mp;
  39             va_start(clean_args, mp);
  40             while (n--) {
  41                 mp_clear(cur_arg);
  42                 cur_arg = va_arg(clean_args, mp_int*);
  43             }
  44             va_end(clean_args);
  45             res = MP_MEM;
  46             break;
  47         }
  48         n++;
  49         cur_arg = va_arg(args, mp_int*);
  50     }
  51     va_end(args);
  52     return res;                /* Assumed ok, if error flagged above. */
  53 }
  54
  55 #endif
  56
  57 /* $Source: /cvs/libtom/libtommath/bn_mp_init_multi.c,v $ */
  58 /* $Revision: 1.3 $ */
  59 /* $Date: 2006/03/31 14:18:44 $ */