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Fri Jun 9 14:28:00 2000 Jeff Johnston <jjohnstn@cygnus.com> 

* libc/include/sys/reent.h (_rand_next): Changed to
        unsigned long long and moved to end of _reent struct in _new union.
        (_REENT_INIT): Changed to move _rand_next initialization.
        * libc/stdlib/rand.c (rand): Changed to use unsigned long long
        linear congruential algorithm that is used by DJGPP.
This commit is contained in:
Jeff Johnston 2000-06-09 18:50:05 +00:00
parent b6c40e83e9
commit 46a43a99c6
3 changed files with 19 additions and 6 deletions
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8
newlib/ChangeLog
View File

@ -1,3 +1,11 @@
Fri Jun 9 14:28:00 2000 Jeff Johnston <jjohnstn@cygnus.com>
* libc/include/sys/reent.h (_rand_next): Changed to
unsigned long long and moved to end of _reent struct in _new union.
(_REENT_INIT): Changed to move _rand_next initialization.
* libc/stdlib/rand.c (rand): Changed to use unsigned long long
linear congruential algorithm that is used by DJGPP.
Thu Jun 8 21:18:00 2000 Ranjith Kumaran <ranjith@cygnus.com>
* libc/include/stdlib.h: Set RAND_MAX to __RAND_MAX.

8
newlib/libc/include/sys/reent.h
View File

@ -177,11 +177,13 @@ struct _reent
{
struct
{
unsigned int _rand_next;
unsigned int _unused_rand;
char * _strtok_last;
char _asctime_buf[26];
struct tm _localtime_buf;
int _gamma_signgam;
unsigned long long _rand_next;
} _reent;
/* Two next two fields were once used by malloc. They are no longer
used. They are used to preserve the space used before so as to
@ -210,8 +212,8 @@ struct _reent
#define _REENT_INIT(var) \
{ 0, &var.__sf[0], &var.__sf[1], &var.__sf[2], 0, "", 0, "C", \
0, NULL, NULL, 0, NULL, NULL, 0, NULL, { {1, NULL, "", \
{ 0,0,0,0,0,0,0,0}, 0 } } }
0, NULL, NULL, 0, NULL, NULL, 0, NULL, { {0, NULL, "", \
{ 0,0,0,0,0,0,0,0}, 0, 1} } }
/*
* All references to struct _reent are via this pointer.

9
newlib/libc/stdlib/rand.c
View File

@ -78,9 +78,12 @@ _DEFUN (srand, (seed), unsigned int seed)
int
_DEFUN_VOID (rand)
{
return ((_REENT->_new._reent._rand_next =
_REENT->_new._reent._rand_next * 1103515245 + 12345 )
& RAND_MAX );
/* This multiplier was obtained from Knuth, D.E., "The Art of
Computer Programming," Vol 2, Seminumerical Algorithms, Third
Edition, Addison-Wesley, 1998, p. 106 (line 26) & p. 108 */
_REENT->_new._reent._rand_next =
_REENT->_new._reent._rand_next * 6364136223846793005LL + 1;
return (int)((_REENT->_new._reent._rand_next >> 32) & RAND_MAX);
}
#endif /* _REENT_ONLY */