/*      $OpenBSD: mconf.h,v 1.3 2017/07/27 15:08:37 bluhm Exp $ */

/*
 * Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*                                                      mconf.h
 *
 *      Common include file for math routines
 *
 *
 *
 * SYNOPSIS:
 *
 * #include "mconf.h"
 *
 *
 *
 * DESCRIPTION:
 *
 * This file contains definitions for error codes that are
 * passed to the common error handling routine mtherr()
 * (which see).
 *
 * The file also includes a conditional assembly definition
 * for the type of computer arithmetic (IEEE, DEC, Motorola
 * IEEE, or UNKnown).
 * 
 * For Digital Equipment PDP-11 and VAX computers, certain
 * IBM systems, and others that use numbers with a 56-bit
 * significand, the symbol DEC should be defined.  In this
 * mode, most floating point constants are given as arrays
 * of octal integers to eliminate decimal to binary conversion
 * errors that might be introduced by the compiler.
 *
 * For little-endian computers, such as IBM PC, that follow the
 * IEEE Standard for Binary Floating Point Arithmetic (ANSI/IEEE
 * Std 754-1985), the symbol IBMPC should be defined.  These
 * numbers have 53-bit significands.  In this mode, constants
 * are provided as arrays of hexadecimal 16 bit integers.
 *
 * Big-endian IEEE format is denoted MIEEE.  On some RISC
 * systems such as Sun SPARC, double precision constants
 * must be stored on 8-byte address boundaries.  Since integer
 * arrays may be aligned differently, the MIEEE configuration
 * may fail on such machines.
 *
 * To accommodate other types of computer arithmetic, all
 * constants are also provided in a normal decimal radix
 * which one can hope are correctly converted to a suitable
 * format by the available C language compiler.  To invoke
 * this mode, define the symbol UNK.
 *
 * An important difference among these modes is a predefined
 * set of machine arithmetic constants for each.  The numbers
 * MACHEP (the machine roundoff error), MAXNUM (largest number
 * represented), and several other parameters are preset by
 * the configuration symbol.  Check the file const.c to
 * ensure that these values are correct for your computer.
 *
 * Configurations NANS, INFINITIES, MINUSZERO, and DENORMAL
 * may fail on many systems.  Verify that they are supposed
 * to work on your computer.
 */

#include <sys/types.h>
#include <endian.h>

/* Constant definitions for math error conditions
 */

#define DOMAIN          1       /* argument domain error */
#define SING            2       /* argument singularity */
#define OVERFLOW        3       /* overflow range error */
#define UNDERFLOW       4       /* underflow range error */
#define TLOSS           5       /* total loss of precision */
#define PLOSS           6       /* partial loss of precision */

#define EDOM            33
#define ERANGE          34

/* Complex numeral.  */
typedef struct
        {
        double r;
        double i;
        } cmplx;

/* Long double complex numeral.  */
typedef struct
        {
        double r;
        double i;
        } cmplxl;

/* Type of computer arithmetic */

/* PDP-11, Pro350, VAX:
 */
#ifdef  __vax__
#define DEC 1
#endif  /* __vax__ */

/* Intel IEEE, low order words come first:
 */
/* #define IBMPC 1 */

/* Motorola IEEE, high order words come first
 * (Sun 680x0 workstation):
 */
/* #define MIEEE 1 */

/* UNKnown arithmetic, invokes coefficients given in
 * normal decimal format.  Beware of range boundary
 * problems (MACHEP, MAXLOG, etc. in const.c) and
 * roundoff problems in pow.c:
 * (Sun SPARCstation)
 */
#ifndef __vax__
#define UNK 1
#endif  /* !__vax__ */

/* If you define UNK, then be sure to set BIGENDIAN properly. */
#if     BYTE_ORDER == BIG_ENDIAN
#define BIGENDIAN 1
#endif  /* BYTE_ORDER == BIG_ENDIAN */

/* Define this `volatile' if your compiler thinks
 * that floating point arithmetic obeys the associative
 * and distributive laws.  It will defeat some optimizations
 * (but probably not enough of them).
 *
 * #define VOLATILE volatile
 */
#define VOLATILE

/* For 12-byte long doubles on an i386, pad a 16-bit short 0
 * to the end of real constants initialized by integer arrays.
 *
 * #define XPD 0,
 *
 * Otherwise, the type is 10 bytes long and XPD should be
 * defined blank (e.g., Microsoft C).
 *
 * #define XPD
 */
#define XPD 0,

/* Define to support tiny denormal numbers, else undefine. */
#ifndef __vax__
#define DENORMAL 1
#endif  /* !__vax__ */

/* Define to ask for infinity support, else undefine. */
#ifndef __vax__
#define INFINITIES 1
#endif  /* !__vax__ */

/* Define to ask for support of numbers that are Not-a-Number,
   else undefine.  This may automatically define INFINITIES in some files. */
#ifndef __vax__
#define NANS 1
#endif  /* !__vax__ */

/* Define to distinguish between -0.0 and +0.0.  */
#define MINUSZERO 1

/* Define 1 for ANSI C atan2() function
   See atan.c and clog.c. */
#define ANSIC 1

int mtherr();

/* Variable for error reporting.  See mtherr.c.  */
extern int merror;

int drand(double *);