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scm_random fix for 64-bit inums

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* libguile/random.c (scm_random): Fix for 64-bit inums.
This commit is contained in:
Andy Wingo 2010-07-27 11:43:22 +02:00
parent 3bac8ddf92
commit cfbccaf49c
1 changed files with 21 additions and 4 deletions
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25
libguile/random.c
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@ -1,4 +1,4 @@
/* Copyright (C) 1999,2000,2001, 2003, 2005, 2006 Free Software Foundation, Inc.
/* Copyright (C) 1999,2000,2001, 2003, 2005, 2006, 2010 Free Software Foundation, Inc.
* This 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
@ -315,9 +315,26 @@ SCM_DEFINE (scm_random, "random", 1, 1, 0,
SCM_VALIDATE_RSTATE (2, state);
if (SCM_I_INUMP (n))
{
unsigned long m = SCM_I_INUM (n);
SCM_ASSERT_RANGE (1, n, m > 0);
return scm_from_ulong (scm_c_random (SCM_RSTATE (state), m));
unsigned long m = (unsigned long) SCM_I_INUM (n);
SCM_ASSERT_RANGE (1, n, SCM_I_INUM (n) > 0);
#if SCM_SIZEOF_UNSIGNED_LONG <= 4
return scm_from_uint32 (scm_c_random (SCM_RSTATE (state),
(scm_t_uint32) m));
#elif SCM_SIZEOF_UNSIGNED_LONG <= 8
if (m <= SCM_T_UINT32_MAX)
return scm_from_uint32 (scm_c_random (SCM_RSTATE (state),
(scm_t_uint32) m));
else
{
scm_t_uint64 upper, lower;
upper = scm_c_random (SCM_RSTATE (state), (scm_t_uint32) (m >> 32));
lower = scm_c_random (SCM_RSTATE (state), SCM_T_UINT32_MAX);
return scm_from_uint64 ((upper << 32) | lower);
}
#else
#error "Cannot deal with this platform's unsigned long size"
#endif
}
SCM_VALIDATE_NIM (1, n);
if (SCM_REALP (n))