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factor out rndget() code, for adding users 

XXX in the future, the entire scheme must be rethinked when we need more
XXX entropy for the hash tables; possibly a cheap add using NZAT and re-
XXX initialise the LCG only on access and when added (so keep NZAT state
XXX separate from LCG state); also, then we will need a more elaborate
XXX scheme, such as adding from environment, editor keypresses and timing
This commit is contained in:
tg 2012-04-14 14:35:13 +00:00
parent b497da1eb4
commit 70e6988d25
2 changed files with 14 additions and 7 deletions
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3
sh.h
View File

@ -152,7 +152,7 @@
#endif
#ifdef EXTERN
__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.547 2012/04/14 14:07:47 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/sh.h,v 1.548 2012/04/14 14:35:12 tg Exp $");
#endif
#define MKSH_VERSION "R40 2012/04/07"
@ -1888,6 +1888,7 @@ size_t array_ref_len(const char *);
char *arrayname(const char *);
mksh_uari_t set_array(const char *, bool, const char **);
uint32_t hash(const void *);
mksh_ari_t rndget(void);
void rndset(long);
enum Test_op {

18
var.c
View File

@ -27,7 +27,7 @@
#include <sys/sysctl.h>
#endif
__RCSID("$MirOS: src/bin/mksh/var.c,v 1.145 2012/04/07 11:19:53 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/var.c,v 1.146 2012/04/14 14:35:13 tg Exp $");
/*-
* Variables
@ -1094,11 +1094,7 @@ getspec(struct tbl *vp)
return;
break;
case V_RANDOM:
/*
* this is the same Linear Congruential PRNG as Borland
* C/C++ allegedly uses in its built-in rand() function
*/
i = ((lcg_state = 22695477 * lcg_state + 1) >> 16) & 0x7FFF;
i = rndget();
break;
case V_HISTSIZE:
i = histsize;
@ -1479,6 +1475,16 @@ hash(const void *s)
return (h);
}
mksh_ari_t
rndget(void)
{
/*
* this is the same Linear Congruential PRNG as Borland
* C/C++ allegedly uses in its built-in rand() function
*/
return (((lcg_state = 22695477 * lcg_state + 1) >> 16) & 0x7FFF);
}
void
rndset(long v)
{