#include <config.h>		/* built by autoconf */

#ifndef NULL
#define NULL 0
#endif

/**********************************************************************/
/* SUPPORT COMPILATION WITH A C++ COMPILER (IF DESIRED)               */
/**********************************************************************/

/* Support declarations of C linkage in C++, for functions not declared in
   C headers the way they should be. */
#ifdef __cplusplus
# define __C_LINKAGE "C"
#else
# define __C_LINKAGE		/* empty */
#endif

/**********************************************************************/
/* Include all the C headers we'll need.  Because many platforms lack one
   or more standard headers or function declarations, there are numerous
   tests and substitutions here. */
/**********************************************************************/

/**********************************************************************/
/* If libxmi is being compiling as part of the libplot/libplotter package,
   add support for multithreading, provided that libc includes pthread
   functions and pthread.h is present.  (This comes first, because defining
   _REENTRANT may alter system header files.) */
/**********************************************************************/

#ifdef LIBPLOT
#ifdef PTHREAD_SUPPORT
#ifdef HAVE_PTHREAD_H
#define _REENTRANT
#include <pthread.h>
#endif
#endif
#endif

/**********************************************************************/
/* INCLUDE stdio.h, ctype.h, errno.h.  (SUBSTITUTE AS NECESSARY.)     */
/**********************************************************************/

#include <stdio.h>
#include <ctype.h>		/* why is this needed? */
#include <errno.h>

/***************************************************************************/
/* INCLUDE math.h, limits.h.  (SUBSTITUTE AS NECESSARY.)                   */
/***************************************************************************/

#ifdef __DJGPP__
/* for DJGPP math.h, must specify that -lm will be used; 
   thanks mdruiter@cs.vu.nl */
#define _USE_LIBM_MATH_H
#endif

/* Include math.h, and whichever other math-related header files we have */

#include <math.h> 

#ifdef HAVE_LIMITS_H
#include <limits.h>		/* for INT_MAX */
#endif
#ifdef HAVE_VALUES_H
#include <values.h>		/* for MAXINT (backup) */
#endif

/* Bounds on integer datatypes (should be in limits.h, but may not be). */

#ifndef UINT_MAX
#ifdef	__STDC__
#define UINT_MAX ((unsigned int)(~(0U)))
#else
#define UINT_MAX ((unsigned int)(~((unsigned int)0)))
#endif
#endif /* not UINT_MAX */

#ifndef INT_MAX
#ifdef MAXINT
#define INT_MAX MAXINT
#else
#define INT_MAX ((int)(~(1U << (8 * (int)sizeof(int) - 1))))
#endif
#endif /* not INT_MAX */

/* IBM's definition of INT_MAX is bizarre, in AIX 4.1 at least, and using
   IROUND() below will yield a warning message unless we repair it */
#ifdef _AIX
#ifdef __GNUC__
#undef INT_MAX
#define INT_MAX ((int)(~(1U << (8 * (int)sizeof(int) - 1))))
#endif
#endif

/**********************************************************************/
/* INCLUDE stdlib.h, string.h.  (SUBSTITUTE AS NECESSARY; if STDC_HEADERS
   is defined then they're both present, and stdarg.h and float.h too.) */
/**********************************************************************/

#ifdef STDC_HEADERS
#include <stdlib.h>		/* for getenv, atoi, atof, etc. */
#include <string.h>		/* for memcpy, memmove, strchr, malloc, etc. */

#else  /* not STDC_HEADERS, must do a LOT of declarations by hand */

#ifdef HAVE_SYS_STDTYPES_H
#include <sys/stdtypes.h>	/* SunOS needs this for size_t */
#endif

/* supply declarations for functions declared in stdlib.h */
extern __C_LINKAGE char *getenv (const char *name);
extern __C_LINKAGE int atoi (const char *nptr);
extern __C_LINKAGE double atof (const char *nptr);

/* supply definitions in stdlib.h */
#define	EXIT_FAILURE	1	/* Failing exit status.  */
#define	EXIT_SUCCESS	0	/* Successful exit status.  */

/* determine how to declare (or define) functions declared in string.h */
#ifdef HAVE_STRCHR
#ifdef HAVE_STRING_H
#include <string.h>
#else
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#endif
#else  /* don't have strchr, prefer strings.h */
#ifdef HAVE_STRINGS_H
#include <strings.h>
#else
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#endif
#define strchr index
#define strrchr rindex
#endif /* not HAVE_STRCHR */

#ifndef HAVE_MEMCPY
#define memcpy(d, s, n) bcopy ((s), (d), (n))
#endif /* not HAVE_MEMCPY */
#ifndef HAVE_MEMMOVE
#define memmove(d, s, n) bcopy ((s), (d), (n))
#endif /* not HAVE_MEMMOVE */

#ifndef HAVE_STRCASECMP		/* will use local version */
extern __C_LINKAGE int strcasecmp (const char *s1, const char *s2);
#endif /* not HAVE_STRCASECMP */

/* supply declarations for more functions declared in stdlib.h */
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#else
extern __C_LINKAGE void * malloc (size_t size);
extern __C_LINKAGE void * realloc (void * ptr, size_t size);
extern __C_LINKAGE void * calloc (size_t nmemb, size_t size);
extern __C_LINKAGE void free (void * ptr);
#endif /* not HAVE_MALLOC_H */

#endif /* not STDC_HEADERS */

/**************************************************************************/
/* Support the `bool' datatype, which our code uses extensively.          */
/**************************************************************************/

#ifndef __cplusplus
#ifndef HAVE_BOOL_IN_CC
#ifdef __STDC__
typedef enum { false = 0, true = 1 } bool;
#else  /* not __STDC__, do things the old-fashioned way */
typedef int bool;
#define false 0
#define true 1
#endif
#endif /* not HAVE_BOOL_IN_CC */
#endif /* not __cplusplus */
  
/**************************************************************************/
/* Define numerical constants (unofficial, so may not be in math.h).      */
/**************************************************************************/

#ifndef M_PI
#define M_PI        3.14159265358979323846264
#endif
#ifndef M_PI_2
#define M_PI_2      1.57079632679489661923
#endif
#ifndef M_SQRT2
#define M_SQRT2     1.41421356237309504880
#endif
#ifndef M_SQRT3
#define M_SQRT3	    1.73205080756887719
#endif

/**************************************************************************/
/* Define misc. math macros (in GCC, can be evaluated more rapidly).      */
/**************************************************************************/

#ifdef __GNUC__
#define DMAX(a,b) ({double _a = (a), _b = (b); _a > _b ? _a : _b; })
#define DMIN(a,b) ({double _a = (a), _b = (b); _a < _b ? _a : _b; })
#define IMAX(a,b) ({int _a = (a), _b = (b); _a > _b ? _a : _b; })
#define IMIN(a,b) ({int _a = (a), _b = (b); _a < _b ? _a : _b; })
#define UMAX(a,b) ({unsigned int _a = (a), _b = (b); _a > _b ? _a : _b; })
#define UMIN(a,b) ({unsigned int _a = (a), _b = (b); _a < _b ? _a : _b; })
#define IROUND(x) ({double _x = (x); int _i; \
                    if (_x >= INT_MAX) _i = INT_MAX; \
                    else if (_x <= -(INT_MAX)) _i = -(INT_MAX); \
                    else _i = (_x > 0.0 ? (int)(_x + 0.5) : (int)(_x - 0.5)); \
                    _i;})
#define FROUND(x) ({double _x = (x); float _f; \
                    if (_x >= FLT_MAX) _f = FLT_MAX; \
                    else if (_x <= -(FLT_MAX)) _f = -(FLT_MAX); \
                    else _f = _x; \
                    _f;})
#define FABS(x) ((x) >= 0.0 ? (x) : -(x))
#define ICEIL(x) ({double _x = (x); int _i = (int)_x; \
		   ((_x == _i) || (_x < 0.0)) ? _i : _i + 1;})
#define IFLOOR(x) ({double _x = (x); int _i = (int)_x; \
		   ((_x == _i) || (_x > 0.0)) ? _i : _i - 1;})
#else
#define DMAX(a,b) ((a) > (b) ? (a) : (b))
#define DMIN(a,b) ((a) < (b) ? (a) : (b))
#define IMAX(a,b) ((a) > (b) ? (a) : (b))
#define IMIN(a,b) ((a) < (b) ? (a) : (b))
#define UMAX(a,b) ((a) > (b) ? (a) : (b))
#define UMIN(a,b) ((a) < (b) ? (a) : (b))
#define IROUND(x) ((int) ((x) > 0 ? (x) + 0.5 : (x) - 0.5))
#define FROUND(x) ((float)(x))
#define FABS(x) ((x) >= 0.0 ? (x) : -(x))
#define ICEIL(x) ((int)ceil(x))
#define IFLOOR(x) ((int)floor(x))
#endif