mp_init_multi.c

   1 #include "tommath_private.h"
   2 #ifdef MP_INIT_MULTI_C
   3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
   4 /* SPDX-License-Identifier: Unlicense */
   5
   6 #include <stdarg.h>
   7
   8 mp_err mp_init_multi(mp_int *mp, ...)
   9 {
  10    mp_err err = MP_OKAY;
  11    int n = 0;                 /* Number of ok inits */
  12    mp_int *cur_arg = mp;
  13    va_list args;
  14
  15    va_start(args, mp);        /* init args to next argument from caller */
  16    while (cur_arg != NULL) {
  17       err = mp_init(cur_arg);
  18       if (err != MP_OKAY) {
  19          /* Oops - error! Back-track and mp_clear what we already
  20             succeeded in init-ing, then return error.
  21          */
  22          va_list clean_args;
  23
  24          /* now start cleaning up */
  25          cur_arg = mp;
  26          va_start(clean_args, mp);
  27          while (n-- != 0) {
  28             mp_clear(cur_arg);
  29             cur_arg = va_arg(clean_args, mp_int *);
  30          }
  31          va_end(clean_args);
  32          break;
  33       }
  34       n++;
  35       cur_arg = va_arg(args, mp_int *);
  36    }
  37    va_end(args);
  38    return err;
  39 }
  40
  41 #endif