/************************************************

  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;
{
    int seed, 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);
}
ion>
<option value='ruby_3_3'>ruby_3_3</option>
<option value='v1_0r'>v1_0r</option>
<option value='v1_1dev'>v1_1dev</option>
<option value='v1_1r'>v1_1r</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>The Ruby Programming Language</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/ruby.git/?h=v1_8_5_220'>summary</a><a href='/ruby.git/refs/?h=v1_8_5_220&amp;id=956ddced23449ee2c285a892fef89189d9b8476d'>refs</a><a href='/ruby.git/log/README.EXT?h=v1_8_5_220'>log</a><a href='/ruby.git/tree/README.EXT?h=v1_8_5_220&amp;id=956ddced23449ee2c285a892fef89189d9b8476d'>tree</a><a class='active' href='/ruby.git/commit/README.EXT?h=v1_8_5_220&amp;id=956ddced23449ee2c285a892fef89189d9b8476d'>commit</a><a href='/ruby.git/diff/README.EXT?h=v1_8_5_220&amp;id=956ddced23449ee2c285a892fef89189d9b8476d'>diff</a></td><td class='form'><form class='right' method='get' action='/ruby.git/log/README.EXT'>
<input type='hidden' name='h' value='v1_8_5_220'/><input type='hidden' name='id' value='956ddced23449ee2c285a892fef89189d9b8476d'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/ruby.git/commit/?h=v1_8_5_220&amp;id=956ddced23449ee2c285a892fef89189d9b8476d'>root</a>/<a href='/ruby.git/commit/README.EXT?h=v1_8_5_220&amp;id=956ddced23449ee2c285a892fef89189d9b8476d'>README.EXT</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='v1_8_5_220'/><input type='hidden' name='id' value='956ddced23449ee2c285a892fef89189d9b8476d'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>matz &lt;matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e&gt;</td><td class='right'>2006-09-13 09:49:58 +0000</td></tr>
<tr><th>committer</th><td>matz &lt;matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e&gt;</td><td class='right'>2006-09-13 09:49:58 +0000</td></tr>
<tr><th>commit</th><td colspan='2' class='sha1'><a href='/ruby.git/commit/README.EXT?h=v1_8_5_220&amp;id=956ddced23449ee2c285a892fef89189d9b8476d'>956ddced23449ee2c285a892fef89189d9b8476d</a> (<a href='/ruby.git/patch/README.EXT?id=956ddced23449ee2c285a892fef89189d9b8476d'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='sha1'><a href='/ruby.git/tree/?h=v1_8_5_220&amp;id=956ddced23449ee2c285a892fef89189d9b8476d'>6ce358f771ba6ea575982b0d0ce189063d62b301</a> /<a href='/ruby.git/tree/README.EXT?h=v1_8_5_220&amp;id=956ddced23449ee2c285a892fef89189d9b8476d'>README.EXT</a></td></tr>
<tr><th>parent</th><td colspan='2' class='sha1'><a href='/ruby.git/commit/README.EXT?h=v1_8_5_220&amp;id=1990397c5cf15c9f8fb84cc20acc75a90dd583a5'>1990397c5cf15c9f8fb84cc20acc75a90dd583a5</a> (<a href='/ruby.git/diff/README.EXT?h=v1_8_5_220&amp;id=956ddced23449ee2c285a892fef89189d9b8476d&amp;id2=1990397c5cf15c9f8fb84cc20acc75a90dd583a5'>diff</a>)</td></tr></table>
<div class='commit-subject'>* README.EXT: English adjustment.  [ruby-core:08851] and</div><div class='commit-msg'>  [ruby-core:08852]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@10921 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
</div>