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Update doc.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41214 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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akr 2013-06-10 10:55:08 +00:00
parent 0e8caa7d0f
commit 6735633663
1 changed files with 10 additions and 5 deletions
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15
bignum.c
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@ -843,6 +843,9 @@ integer_pack_take_lowbits(int n, BDIGIT_DBL *ddp, int *numbits_in_dd_p)
/*
* Export an integer into a buffer.
*
* This function fills the buffer specified by _words_ and _numwords_ as
* abs(val) in the format specified by _wordsize_, _nails_ and _flags_.
*
* [val] Fixnum, Bignum or another integer like object which has to_int method.
* [words] buffer to export abs(val).
* [numwords] the size of given buffer as number of words.
@ -853,11 +856,13 @@ integer_pack_take_lowbits(int n, BDIGIT_DBL *ddp, int *numbits_in_dd_p)
* It specifies word order and byte order.
*
* This function returns the signedness and overflow condition as follows:
* -2 : negative overflow.
* -1 : negative without overflow.
* 0 : zero.
* 1 : positive without overflow.
* 2 : positive overflow.
* -2 : negative overflow. val <= -2**(numwords*(wordsize*CHAR_BIT-nails))
* -1 : negative without overflow. -2**(numwords*(wordsize*CHAR_BIT-nails)) < val < 0
* 0 : zero. val == 0
* 1 : positive without overflow. 0 < val < 2**(numwords*(wordsize*CHAR_BIT-nails))
* 2 : positive overflow. 2**(numwords*(wordsize*CHAR_BIT-nails)) <= val
*
* The least significant words of abs(val) are filled in the buffer when overflow occur.
*/
int