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annotate libtommath/bn_mp_get_int.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 5ff8218bcee9
children 60fc6476e044
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1 #include <tommath.h>
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2 #ifdef BN_MP_GET_INT_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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18 /* get the lower 32-bits of an mp_int */
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19 unsigned long mp_get_int(mp_int * a)
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20 {
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21 int i;
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22 unsigned long res;
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24 if (a->used == 0) {
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25 return 0;
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26 }
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28 /* get number of digits of the lsb we have to read */
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29 i = MIN(a->used,(int)((sizeof(unsigned long)*CHAR_BIT+DIGIT_BIT-1)/DIGIT_BIT))-1;
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31 /* get most significant digit of result */
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32 res = DIGIT(a,i);
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34 while (--i >= 0) {
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35 res = (res << DIGIT_BIT) | DIGIT(a,i);
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36 }
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38 /* force result to 32-bits always so it is consistent on non 32-bit platforms */
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39 return res & 0xFFFFFFFFUL;
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40 }
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41 #endif
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43 /* $Source: /cvs/libtom/libtommath/bn_mp_get_int.c,v $ */
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44 /* $Revision: 1.3 $ */
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45 /* $Date: 2006/03/31 14:18:44 $ */