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Document and enforce that the usable range of setseed() arguments is

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-1 to 1, not 0 to 1.  The actual behavior for values within this range
does not change.  Kris Jurka
This commit is contained in:
Tom Lane
2008-03-10 12:39:23 +00:00
parent bfce56eea4
commit 23c356ccec
4 changed files with 12 additions and 8 deletions
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8
src/backend/utils/adt/float.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/float.c,v 1.153 2008/01/01 19:45:52 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/float.c,v 1.154 2008/03/10 12:39:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -1684,8 +1684,12 @@ Datum
setseed(PG_FUNCTION_ARGS)
{
float8 seed = PG_GETARG_FLOAT8(0);
int iseed = (int) (seed * MAX_RANDOM_VALUE);
int iseed;
if (seed < -1 || seed > 1)
elog(ERROR, "setseed parameter %f out of range [-1,1]", seed);
iseed = (int) (seed * MAX_RANDOM_VALUE);
srandom((unsigned int) iseed);
PG_RETURN_VOID();