/* public domain rewrite of isnan(3) */

#include "ruby/missing.h"

/*
 * isnan() may be a macro, a function or both.
 * (The C99 standard defines that isnan() is a macro, though.)
 * http://www.gnu.org/software/automake/manual/autoconf/Function-Portability.html
 *
 * macro only: uClibc
 * both: GNU libc
 *
 * This file is compile if no isnan() function is available.
 * (autoconf AC_REPLACE_FUNCS detects only the function.)
 * The macro is detected by following #ifndef.
 */

#ifndef isnan
static int double_ne(double n1, double n2);

int
isnan(double n)
{
    return double_ne(n, n);
}

static int
double_ne(double n1, double n2)
{
    return n1 != n2;
}
#endif
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<tr><td class='sub'>The Ruby Programming Language</td><td class='sub right'></td></tr></table>
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<a href='/ruby.git/?h=v1_8_6_228'>summary</a><a href='/ruby.git/refs/?h=v1_8_6_228&amp;id=a18125cfc8a8f535ffb591e35908a5fbb4b32302'>refs</a><a class='active' href='/ruby.git/log/COPYING?h=v1_8_6_228'>log</a><a href='/ruby.git/tree/COPYING?h=v1_8_6_228&amp;id=a18125cfc8a8f535ffb591e35908a5fbb4b32302'>tree</a><a href='/ruby.git/commit/COPYING?h=v1_8_6_228&amp;id=a18125cfc8a8f535ffb591e35908a5fbb4b32302'>commit</a><a href='/ruby.git/diff/COPYING?h=v1_8_6_228&amp;id=a18125cfc8a8f535ffb591e35908a5fbb4b32302'>diff</a></td><td class='form'><form class='right' method='get' action='/ruby.git/log/COPYING'>
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<div class='path'>path: <a href='/ruby.git/log/?h=v1_8_6_228&amp;id=a18125cfc8a8f535ffb591e35908a5fbb4b32302'>root</a>/<a href='/ruby.git/log/COPYING?h=v1_8_6_228&amp;id=a18125cfc8a8f535ffb591e35908a5fbb4b32302'>COPYING</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/ruby.git/log/COPYING?h=v1_8_6_228&amp;id=a18125cfc8a8f535ffb591e35908a5fbb4b32302&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2006-04-09 16:10:40 +0000'>2006-04-09</span></td><td><a href='/ruby.git/commit/COPYING?h=v1_8_6_228&amp;id=234c47e9fba274e1d07bdc39846cb9dbe3db569e'>* prec.c (prec_prec_f): documentation patch from</a></td><td>matz</td></tr>
<tr><td><span title='2002-02-25 09:16:25 +0000'>2002-02-25</span></td><td><a href='/ruby.git/commit/COPYING?h=v1_8_6_228&amp;id=6d47b8a9cc988bb210fc44ce991a0212d97296e4'>* eval.c (method_inspect): should not dump core for unbound</a></td><td>matz</td></tr>
<tr><td><span title='2002-02-21 07:15:06 +0000'>2002-02-21</span></td><td><a href='/ruby.git/commit/COPYING?h=v1_8_6_228&amp;id=a08cea360d69e6a7c42154f2032590ea3e77a386'>* pack.c (pack_pack): wrong # comment treatment.</a></td><td>matz</td></tr>
<tr><td><span title='2001-09-08 14:17:53 +0000'>2001-09-08</span></td><td><a href='/ruby.git/commit/COPYING?h=v1_8_6_228&amp;id=67245eec7192abdc1dd0dc2510c1f6c77df89bd0'>* eval.c (rb_thread_restore_context): save current value of</a></td><td>matz</td></tr>
<tr><td><span title='2001-07-13 08:21:55 +0000'>2001-07-13</span></td><td><a href='/ruby.git/commit/COPYING?h=v1_8_6_228&amp;id=c5a7e3570690f1a6570cc3cb1876f5f77a20fe3c'>Point to the newly added file LEGAL.</a></td><td>knu</td></tr>
<tr><td><span title='2001-07-11 19:25:52 +0000'>2001-07-11</span></td><td><a href='/ruby.git/commit/COPYING?h=v1_8_6_228&amp;id=cbc3756009999e58d717af4fc82ba6c33bd3e7e6'>* It is confusing to put the GPL license terms in the file COPYING;</a></td><td>knu</td></tr>