Fix writes past the allocated array bounds in execvpe (BZ#20847)
[glibc.git] / sysdeps / ieee754 / dbl-64 / s_isnan.c
blob2174d988d8462696ca8bccc3763b744381b36fc7
1 /* @(#)s_isnan.c 5.1 93/09/24 */
2 /*
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this
8 * software is freely granted, provided that this notice
9 * is preserved.
10 * ====================================================
13 #if defined(LIBM_SCCS) && !defined(lint)
14 static char rcsid[] = "$NetBSD: s_isnan.c,v 1.8 1995/05/10 20:47:36 jtc Exp $";
15 #endif
18 * isnan(x) returns 1 is x is nan, else 0;
19 * no branching!
22 #include <math.h>
23 #include <math_private.h>
24 #include <shlib-compat.h>
26 #undef __isnan
27 int
28 __isnan (double x)
30 int32_t hx, lx;
31 EXTRACT_WORDS (hx, lx, x);
32 hx &= 0x7fffffff;
33 hx |= (u_int32_t) (lx | (-lx)) >> 31;
34 hx = 0x7ff00000 - hx;
35 return (int) (((u_int32_t) hx) >> 31);
37 hidden_def (__isnan)
38 weak_alias (__isnan, isnan)
39 #ifdef NO_LONG_DOUBLE
40 # if defined LDBL_CLASSIFY_COMPAT && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_23)
41 compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
42 # endif
43 weak_alias (__isnan, isnanl)
44 #endif