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/************************************************
random.c -
$Author$
$Date$
created at: Fri Dec 24 16:39:21 JST 1993
Copyright (C) 1993-1996 Yukihiro Matsumoto
************************************************/
#include "ruby.h"
static int first = 1;
static char state[256];
static VALUE
f_srand(argc, argv, obj)
int argc;
VALUE *argv;
VALUE obj;
{
VALUE seed;
int old;
static int saved_seed;
if (rb_scan_args(argc, argv, "01", &seed) == 0) {
seed = time(0);
}
else {
seed = NUM2INT(seed);
}
#ifdef HAVE_RANDOM
if (first == 1) {
initstate(1, state, sizeof state);
first = 0;
}
else {
setstate(state);
}
srandom(seed);
old = saved_seed;
saved_seed = seed;
return int2inum(old);
#else
srand(seed);
old = saved_seed;
saved_seed = seed;
return int2inum(old);
#endif
}
static VALUE
f_rand(obj, vmax)
VALUE obj, vmax;
{
int val, max;
#ifdef HAVE_RANDOM
if (first == 1) {
initstate(1, state, sizeof state);
first = 0;
}
#endif
switch (TYPE(vmax)) {
case T_BIGNUM:
return big_rand(vmax);
case T_FLOAT:
if (RFLOAT(vmax)->value > LONG_MAX || RFLOAT(vmax)->value < LONG_MIN)
return big_rand(dbl2big(RFLOAT(vmax)->value));
break;
}
max = NUM2INT(vmax);
if (max == 0) ArgError("rand(0)");
#ifdef HAVE_RANDOM
val = random() % max;
#else
val = rand() % max;
#endif
if (val < 0) val = -val;
return int2inum(val);
}
void
Init_Random()
{
extern VALUE mKernel;
rb_define_global_function("srand", f_srand, -1);
rb_define_global_function("rand", f_rand, 1);
}
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