LCOV - code coverage report
Current view: top level - source4/heimdal/lib/hcrypto/libtommath - bn_mp_toradix_n.c (source / functions) Hit Total Coverage
Test: coverage report for abartlet/fix-coverage dd10fb34 Lines: 0 28 0.0 %
Date: 2021-09-23 10:06:22 Functions: 0 1 0.0 %

          Line data    Source code
       1             : #include <tommath.h>
       2             : #ifdef BN_MP_TORADIX_N_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://libtom.org
      16             :  */
      17             : 
      18             : /* stores a bignum as a ASCII string in a given radix (2..64)
      19             :  *
      20             :  * Stores upto maxlen-1 chars and always a NULL byte
      21             :  */
      22           0 : int mp_toradix_n(mp_int * a, char *str, int radix, int maxlen)
      23             : {
      24             :   int     res, digs;
      25             :   mp_int  t;
      26             :   mp_digit d;
      27           0 :   char   *_s = str;
      28             : 
      29             :   /* check range of the maxlen, radix */
      30           0 :   if (maxlen < 2 || radix < 2 || radix > 64) {
      31           0 :     return MP_VAL;
      32             :   }
      33             : 
      34             :   /* quick out if its zero */
      35           0 :   if (mp_iszero(a) == MP_YES) {
      36           0 :      *str++ = '0';
      37           0 :      *str = '\0';
      38           0 :      return MP_OKAY;
      39             :   }
      40             : 
      41           0 :   if ((res = mp_init_copy (&t, a)) != MP_OKAY) {
      42           0 :     return res;
      43             :   }
      44             : 
      45             :   /* if it is negative output a - */
      46           0 :   if (t.sign == MP_NEG) {
      47             :     /* we have to reverse our digits later... but not the - sign!! */
      48           0 :     ++_s;
      49             : 
      50             :     /* store the flag and mark the number as positive */
      51           0 :     *str++ = '-';
      52           0 :     t.sign = MP_ZPOS;
      53             : 
      54             :     /* subtract a char */
      55           0 :     --maxlen;
      56             :   }
      57             : 
      58           0 :   digs = 0;
      59           0 :   while (mp_iszero (&t) == 0) {
      60           0 :     if (--maxlen < 1) {
      61             :        /* no more room */
      62           0 :        break;
      63             :     }
      64           0 :     if ((res = mp_div_d (&t, (mp_digit) radix, &t, &d)) != MP_OKAY) {
      65           0 :       mp_clear (&t);
      66           0 :       return res;
      67             :     }
      68           0 :     *str++ = mp_s_rmap[d];
      69           0 :     ++digs;
      70             :   }
      71             : 
      72             :   /* reverse the digits of the string.  In this case _s points
      73             :    * to the first digit [exluding the sign] of the number
      74             :    */
      75           0 :   bn_reverse ((unsigned char *)_s, digs);
      76             : 
      77             :   /* append a NULL so the string is properly terminated */
      78           0 :   *str = '\0';
      79             : 
      80           0 :   mp_clear (&t);
      81           0 :   return MP_OKAY;
      82             : }
      83             : 
      84             : #endif
      85             : 
      86             : /* $Source: /cvs/libtom/libtommath/bn_mp_toradix_n.c,v $ */
      87             : /* $Revision: 1.5 $ */
      88             : /* $Date: 2006/12/28 01:25:13 $ */

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