home *** CD-ROM | disk | FTP | other *** search
- /*
- Copyright (C) 1994 M. Hagiya, W. Schelter, T. Yuasa
-
- This file is part of GNU Common Lisp, herein referred to as GCL
-
- GCL is free software; you can redistribute it and/or modify it under
- the terms of the GNU LIBRARY GENERAL PUBLIC LICENSE as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- GCL 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 Library General Public
- License for more details.
-
- You should have received a copy of the GNU Library General Public License
- along with GCL; see the file COPYING. If not, write to the Free Software
- Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- */
-
- /*
- Random numbers
- */
-
- #include "include.h"
- #include "num_include.h"
-
- #ifdef AOSVS
-
- #endif
-
- object
- rando(x, rs)
- object x, rs;
- {
- enum type tx;
- object z;
- double d;
-
- tx = type_of(x);
- if (number_compare(x, small_fixnum(0)) != 1)
- FEwrong_type_argument(TSpositive_number, x);
- d = (double)(rs->rnd.rnd_value>>1) / (4294967296.0/2.0);
- d = number_to_double(x) * d;
- if (tx == t_fixnum) {
- z = make_fixnum((int)d);
- return(z);
- } else if (tx == t_bignum) {
- z = double_to_integer(d);
- return(z);
- } else if (tx == t_shortfloat) {
- z = alloc_object(t_shortfloat);
- sf(z) = (float)d;
- return(z);
- } else if (tx == t_longfloat) {
- z = alloc_object(t_longfloat);
- lf(z) = d;
- return(z);
- } else
- FEerror("~S is not an integer nor a floating-point number.",
- 1, x);
- }
-
- object
- make_random_state(rs)
- object rs;
- {
- object z;
- #ifdef AOSVS
-
- #endif
-
- if (rs == Cnil) {
- z = alloc_object(t_random);
- z->rnd.rnd_value = symbol_value(Vrandom_state)->rnd.rnd_value;
- return(z);
- } else if (rs == Ct) {
- z = alloc_object(t_random);
- #ifdef UNIX
- z->rnd.rnd_value = time(0);
- #endif
- #ifdef AOSVS
-
-
-
-
- #endif
- return(z);
- } else if (type_of(rs) != t_random)
- FEwrong_type_argument(Srandom_state, rs);
- else {
- z =alloc_object(t_random);
- z->rnd.rnd_value = rs->rnd.rnd_value;
- return(z);
- }
- }
-
- advance_random_state(rs)
- object rs;
- {
- rs->rnd.rnd_value
- = rs->rnd.rnd_value
- + (rs->rnd.rnd_value<<2)
- + (rs->rnd.rnd_value<<17)
- + (rs->rnd.rnd_value<<27);
- }
-
-
- Lrandom()
- {
- int j;
- object x;
- object rs;
-
- j = vs_top - vs_base;
- if (j == 1)
- vs_push(symbol_value(Vrandom_state));
- check_arg(2);
- check_type_random_state(&vs_base[1]);
- advance_random_state(vs_base[1]);
- x = rando(vs_base[0], vs_base[1]);
- vs_top = vs_base;
- vs_push(x);
- }
-
- Lmake_random_state()
- {
- int j;
- object x;
-
- j = vs_top - vs_base;
- if (j == 0)
- vs_push(Cnil);
- check_arg(1);
- x = make_random_state(vs_head);
- vs_top = vs_base;
- vs_push(x);
- }
-
- Lrandom_state_p()
- {
- check_arg(1);
- if (type_of(vs_pop) == t_random)
- vs_push(Ct);
- else
- vs_push(Cnil);
- }
-
- init_num_rand()
- {
- Vrandom_state = make_special("*RANDOM-STATE*",
- make_random_state(Ct));
-
- make_function("RANDOM", Lrandom);
- make_function("MAKE-RANDOM-STATE", Lmake_random_state);
- make_function("RANDOM-STATE-P", Lrandom_state_p);
- }
-