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Diffstat (limited to 'newlib/libm/math/w_hypot.c')
| -rw-r--r-- | newlib/libm/math/w_hypot.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/newlib/libm/math/w_hypot.c b/newlib/libm/math/w_hypot.c new file mode 100644 index 00000000000..318853d5616 --- /dev/null +++ b/newlib/libm/math/w_hypot.c @@ -0,0 +1,109 @@ + +/* @(#)w_hypot.c 5.1 93/09/24 */ +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +/* +FUNCTION + <<hypot>>, <<hypotf>>---distance from origin +INDEX + hypot +INDEX + hypotf + +ANSI_SYNOPSIS + #include <math.h> + double hypot(double <[x]>, double <[y]>); + float hypotf(float <[x]>, float <[y]>); + +TRAD_SYNOPSIS + double hypot(<[x]>, <[y]>) + double <[x]>, <[y]>; + + float hypotf(<[x]>, <[y]>) + float <[x]>, <[y]>; + +DESCRIPTION + <<hypot>> calculates the Euclidean distance + @tex + $\sqrt{x^2+y^2}$ + @end tex + @ifinfo + <<sqrt(<[x]>*<[x]> + <[y]>*<[y]>)>> + @end ifinfo + between the origin (0,0) and a point represented by the + Cartesian coordinates (<[x]>,<[y]>). <<hypotf>> differs only + in the type of its arguments and result. + +RETURNS + Normally, the distance value is returned. On overflow, + <<hypot>> returns <<HUGE_VAL>> and sets <<errno>> to + <<ERANGE>>. + + You can change the error treatment with <<matherr>>. + +PORTABILITY + <<hypot>> and <<hypotf>> are not ANSI C. */ + +/* + * wrapper hypot(x,y) + */ + +#include "fdlibm.h" +#include <errno.h> + +#ifndef _DOUBLE_IS_32BITS + +#ifdef __STDC__ + double hypot(double x, double y)/* wrapper hypot */ +#else + double hypot(x,y) /* wrapper hypot */ + double x,y; +#endif +{ +#ifdef _IEEE_LIBM + return __ieee754_hypot(x,y); +#else + double z; + struct exception exc; + z = __ieee754_hypot(x,y); + if(_LIB_VERSION == _IEEE_) return z; + if((!finite(z))&&finite(x)&&finite(y)) { + /* hypot(finite,finite) overflow */ +#ifndef HUGE_VAL +#define HUGE_VAL inf + double inf = 0.0; + + SET_HIGH_WORD(inf,0x7ff00000); /* set inf to infinite */ +#endif + exc.type = OVERFLOW; + exc.name = "hypot"; + exc.err = 0; + exc.arg1 = x; + exc.arg2 = y; + if (_LIB_VERSION == _SVID_) + exc.retval = HUGE; + else + exc.retval = HUGE_VAL; + if (_LIB_VERSION == _POSIX_) + errno = ERANGE; + else if (!matherr(&exc)) { + errno = ERANGE; + } + if (exc.err != 0) + errno = exc.err; + return exc.retval; + } else + return z; +#endif +} + +#endif /* defined(_DOUBLE_IS_32BITS) */ |