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0e45984fa0
The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly uninitialized data structure if loading the library first failed. A later try to use EGL then skipped initialization and assumed it was previously successful because the data structure now already existed. This led to at least one crash in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was dereferenced to make a call to eglBindAPI().
92 lines
2.3 KiB
C
92 lines
2.3 KiB
C
/* @(#)s_cos.c 5.1 93/09/24 */
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#if defined(LIBM_SCCS) && !defined(lint)
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static const char rcsid[] =
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"$NetBSD: s_cos.c,v 1.7 1995/05/10 20:47:02 jtc Exp $";
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#endif
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/* cos(x)
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* Return cosine function of x.
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*
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* kernel function:
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* __kernel_sin ... sine function on [-pi/4,pi/4]
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* __kernel_cos ... cosine function on [-pi/4,pi/4]
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* __ieee754_rem_pio2 ... argument reduction routine
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*
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* Method.
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* Let S,C and T denote the sin, cos and tan respectively on
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* [-PI/4, +PI/4]. Reduce the argument x to y1+y2 = x-k*pi/2
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* in [-pi/4 , +pi/4], and let n = k mod 4.
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* We have
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*
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* n sin(x) cos(x) tan(x)
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* ----------------------------------------------------------
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* 0 S C T
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* 1 C -S -1/T
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* 2 -S -C T
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* 3 -C S -1/T
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* ----------------------------------------------------------
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*
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* Special cases:
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* Let trig be any of sin, cos, or tan.
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* trig(+-INF) is NaN, with signals;
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* trig(NaN) is that NaN;
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*
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* Accuracy:
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* TRIG(x) returns trig(x) nearly rounded
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*/
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#include "math_libm.h"
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#include "math_private.h"
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libm_hidden_proto(cos)
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#ifdef __STDC__
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double cos(double x)
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#else
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double cos(x)
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double x;
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#endif
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{
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double y[2], z = 0.0;
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int32_t n, ix;
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/* High word of x. */
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GET_HIGH_WORD(ix, x);
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/* |x| ~< pi/4 */
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ix &= 0x7fffffff;
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if (ix <= 0x3fe921fb)
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return __kernel_cos(x, z);
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/* cos(Inf or NaN) is NaN */
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else if (ix >= 0x7ff00000)
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return x - x;
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/* argument reduction needed */
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else {
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n = __ieee754_rem_pio2(x, y);
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switch (n & 3) {
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case 0:
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return __kernel_cos(y[0], y[1]);
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case 1:
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return -__kernel_sin(y[0], y[1], 1);
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case 2:
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return -__kernel_cos(y[0], y[1]);
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default:
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return __kernel_sin(y[0], y[1], 1);
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}
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}
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}
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libm_hidden_def(cos)
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