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2005-02-09 Jakub Jelinek <jakub@redhat.com>

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[BZ #710]
	* stdlib/random_r.c (__initstate_r): Save old state.
	* stdlib/Makefile (tests): Add tst-random2.
	* stdlib/tst-random2.c: New test.
	Reported by Peter Bergner <bergner@vnet.ibm.com>.
This commit is contained in:
Roland McGrath 2005-02-16 11:23:58 +00:00
parent 094c88feda
commit ea741677e9
3 changed files with 71 additions and 3 deletions
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6
stdlib/Makefile
View File

@ -61,9 +61,9 @@ distribute := exit.h grouping.h abort-instr.h isomac.c tst-fmtmsg.sh \
test-srcs := tst-fmtmsg
tests := tst-strtol tst-strtod testmb testrand testsort testdiv \
test-canon test-canon2 tst-strtoll tst-environ \
tst-xpg-basename tst-random tst-bsearch tst-limits \
tst-rand48 bug-strtod tst-setcontext test-a64l tst-qsort \
tst-system testmb2
tst-xpg-basename tst-random tst-random2 tst-bsearch \
tst-limits tst-rand48 bug-strtod tst-setcontext \
test-a64l tst-qsort tst-system testmb2
include ../Makeconfig

9
stdlib/random_r.c
View File

@ -240,10 +240,19 @@ __initstate_r (seed, arg_state, n, buf)
int degree;
int separation;
int32_t *state;
int old_type;
int32_t *old_state;
if (buf == NULL)
goto fail;
old_type = buf->rand_type;
old_state = buf->state;
if (old_type == TYPE_0)
old_state[-1] = TYPE_0;
else
old_state[-1] = (MAX_TYPES * (buf->rptr - old_state)) + old_type;
if (n >= BREAK_3)
type = n < BREAK_4 ? TYPE_3 : TYPE_4;
else if (n < BREAK_1)

59
stdlib/tst-random2.c Normal file
View File

@ -0,0 +1,59 @@
/* Test initstate saving the old state.
Copyright (C) 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2005.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <stdio.h>
#include <stdlib.h>
int
main (void)
{
int pass;
int ret = 0;
long int r[2];
for (pass = 0; pass < 2; pass++)
{
srandom (0x12344321);
int j;
for (j = 0; j < 3; ++j)
random ();
if (pass == 1)
{
char state[128];
char *ostate = initstate (0x34562101, state, 128);
if (setstate (ostate) != state)
{
puts ("setstate (ostate) != state");
ret = 1;
}
}
random ();
r[pass] = random ();
}
if (r[0] != r[1])
{
printf ("%ld != %ld\n", r[0], r[1]);
ret = 1;
}
return ret;
}