utils.h

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/*============================================================================*/

#ifndef __UTILS_H_
#define __UTILS_H_
/*----------------------------------------------------------------------------*/

#include "cstd.h"
#include "usempi.h"

/*----------------------------------------------------------------------------*/
/* inline keyword. */
#ifndef __cplusplus
#if __STDC_VERSION__ >= 199901L
#else
#define inline
#endif
#endif
/* restrict keyword. */
#if __STDC_VERSION__ >= 199901L
#else
#define restrict
#endif
/*----------------------------------------------------------------------------*/
/* 
   Data types.
*/
#define DT_CSTRING     1
#define DT_CHAR        2
#define DT_SHORT       3
#define DT_INT         4
#define DT_LONG        5
#define DT_FLOAT       6
#define DT_DOUBLE      7
#define DT_USHORT      9
#define DT_UINT       10
#define DT_ULONG      11
/*----------------------------------------------------------------------------*/
/*#define DT_REAL DT_DOUBLE*/  
#define DT_REAL DT_FLOAT
/*----------------------------------------------------------------------------*/
/* DO NOT CHANGE. */
#if   DT_REAL == DT_DOUBLE

#define ireal double
#define REAL_NAN 0.0         /* TODO: better than 0 */
#define REAL_ZERO 0.0
#define REAL_ONE 1.0
#define REAL_EPS DBL_EPSILON
#define REAL_MIN DBL_MIN
#define REAL_MAX DBL_MAX
#define IWAVE_MPI_REAL MPI_DOUBLE
#elif DT_REAL == DT_FLOAT
#define ireal float

#define REAL_NAN 0.0f        /* TODO: better than 0 */
#define REAL_ZERO 0.0f
#define REAL_ONE 1.0f
#define REAL_EPS FLT_EPSILON
#define REAL_MIN FLT_MIN
#define REAL_MAX FLT_MAX
#define IWAVE_MPI_REAL MPI_FLOAT
#else
#error REAL TYPE UNDEFINED.
#endif

/*----------------------------------------------------------------------------*/
#define RDOM_MAX_NARR 30
/*----------------------------------------------------------------------------*/
#define RARR_MAX_NDIM 3

/******************* begin formerly in iwave.h - moved 26.01.11 WWS ***********/
/*
  Number of dimensions. 1D/2D/3D only. 
  CHANGE BEFORE COMPILING. 
  IWAVE_NDIM SHOULD BE >= RARR_MAX_NDIM.
*/
#define IWAVE_NDIM 3   /* 1 | 2 | 3 */
  
#if IWAVE_NDIM > RARR_MAX_NDIM
#error NOT ENOUGH DIMENSIONS IN THE RARRAY: WAVE_NDIM > RARR_MAX_NDIM.
#endif
/*----------------------------------------------------------------------------*/
/*
  3^IWAVE_NDIM and number of neighbors for 1D/2D/3D.
  Note: lranks index is computed via ex_ind2n(..), 
  lranks[IWAVE_NNEI] contains this processor's rank.
*/
#if   IWAVE_NDIM == 1
#define IWAVE_3NDIM 3
#elif IWAVE_NDIM == 2
#define IWAVE_3NDIM 9
#elif IWAVE_NDIM == 3
#define IWAVE_3NDIM 27
#else
#error IWAVE_3NDIM UNDEFINED.
#endif

#define IWAVE_NNEI (IWAVE_3NDIM - 1)

/********************* end formerly in iwave.h - moved 26.01.11 WWS ***********/

/*----------------------------------------------------------------------------*/
/*
  Indices of coordinate axes. Permutation of {0,1,2}.
  TO CHANGE BY USER.
*/
#define IX 0
#define IY 1
#define IZ 2
/*----------------------------------------------------------------------------*/
/*
  Flag (0/1) to dump pointers when dumping an array.
  TO CHANGE BY USER.
*/
#define RARR_DUMP_POINTERS 0
/*----------------------------------------------------------------------------*/
typedef int IPNT[RARR_MAX_NDIM];
typedef ireal RPNT[RARR_MAX_NDIM];

#if   RARR_MAX_NDIM == 1
static const IPNT IPNT_0 = {0};
static const IPNT IPNT_1 = {1};
static const RPNT RPNT_0 = {REAL_ZERO};
static const RPNT RPNT_1 = {REAL_ONE};
#define RARR_MAX_3NDIM     3
#elif RARR_MAX_NDIM == 2
static const IPNT IPNT_0 = {0, 0};
static const IPNT IPNT_1 = {1, 1};
static const RPNT RPNT_0 = {REAL_ZERO, REAL_ZERO};
static const RPNT RPNT_1 = {REAL_ONE, REAL_ONE};
#define RARR_MAX_3NDIM     9
#elif RARR_MAX_NDIM == 3
static const IPNT IPNT_0 = {0, 0, 0};
static const IPNT IPNT_1 = {1, 1, 1};
static const RPNT RPNT_0 = {REAL_ZERO, REAL_ZERO, REAL_ZERO};
static const RPNT RPNT_1 = {REAL_ONE, REAL_ONE, REAL_ONE};
#define RARR_MAX_3NDIM     27
#else
#error IPNT/RPNT CONSTANTS UNDEFINED.
#endif



int* IASN(IPNT l, const IPNT r);
ireal* RASN(RPNT l, const RPNT r);

/* compatibility */
#define _IPNT IPNT
#define _RPNT RPNT
/*----------------------------------------------------------------------------*/
/*
  Flag to perform bounds checks.
  TO CHANGE BY USER.
*/
#define CHECK_BOUNDS
/* #undef CHECK_BOUNDS */
/*----------------------------------------------------------------------------*/
typedef struct s_SIZEDSTRING
{
    long n;
    char *s;
} SIZEDSTRING;
/*----------------------------------------------------------------------------*/
/*
  Separator and quote symbols for parser.
  TO CHANGE BY USER.
*/
#define PS_SEP '='     /* separator symbol */
#define PS_QUO '"'     /* quote symbol */
/*----------------------------------------------------------------------------*/
void* usermalloc_(size_t size);
void userfree_(void *ptr);
/*----------------------------------------------------------------------------*/
/*
  Min, max macros.
*/

#define iwave_min(a, b) ((a) < (b) ? (a) : (b))
#define iwave_max(a, b) ((a) > (b) ? (a) : (b))
#define iwave_abs(a) ((a) < REAL_ZERO ? (-a) : (a))

/*----------------------------------------------------------------------------*/
#define E_SUCCESS          0     
#define E_INTERNAL      1000     
#define E_OTHER         2000     
#define E_ALLOC            1     
#define E_BADINPUT         2     
#define E_OUTOFBOUNDS      3     
#define E_BADINDEX         4     
#define E_BADARRINDEX      5     
#define E_BADDIMINDEX      6     
#define E_FILE             7     
#define E_FILEOPEN         8     
#define E_MPI              9     
#define E_DOMAINDECOMP    10     
#define E_PARSE           11     
#define E_PARSENONAME     12     
#define E_PARSENOVALUE    13     
#define E_PARSECONVERT    14     
#define E_ALREADYALLOC    15     
#define E_RANGE           -2     
#define E_OVERFLOW        -3     
#define E_UNDERFLOW       -4     
#define E_NOTIMESTEP    -100     
#define E_NOTINGRID     -200     

/*----------------------------------------------------------------------------*/
/*
  Numbering functions.
  Convert {-1,0,1}^ndim to a linear index and back. 
  Note: {0,0,0} always gets last linear index (3^ndim - 1).

  gen_3n1   :  number of linear indices - 1 (IMPORTANT:  returns n = 3^ndim - 1).
  gen_n2pnt :  linear index to cartesian.
  gen_pnt2n :  cartesian index to linear.
  
  int ndim   :  number of dimensions.
  IPNT p     :  cartesian index, each p[i] is from {-1,0,1} set.
  int i      :  linear index from 0 to 3^ndim - 1 (including).
  int return :  error code.
*/
int gen_3n1(int ndim, int *n);
int gen_i2pnt(int ndim, int i, IPNT p);
int gen_pnt2i(int ndim, const IPNT p, int *i);
/*----------------------------------------------------------------------------*/

void storeRank(int rk);
int retrieveRank();

void storeSize(int sz);
int retrieveSize();

void storeComm(MPI_Comm cm);
MPI_Comm retrieveComm();

void storeOutstream(FILE *stream);
FILE* retrieveOutstream();

/*
 * added 31.01.09 WWS
 */
void storeGlobalRank(int rk);
int retrieveGlobalRank();

void storeGlobalSize(int sz);
int retrieveGlobalSize();

void storeGlobalComm(MPI_Comm cm);
MPI_Comm retrieveGlobalComm();

void storeThreadSupp(int ts);
int retrieveThreadSupp();

/*
 * added 21.11.10 WWS
 */
void storeGroupID(int);
int retrieveGroupID();

void storeNumGroups(int);
int retrieveNumGroups();

/*
 * added 17.01.11 WWS
 */
void storeRemComm(MPI_Comm cm);
MPI_Comm retrieveRemComm();

/*----------------------------------------------------------------------------*/
/* 
   Determine machine endiannes runtime
*/
#define SEAMX_BIG_ENDIAN    0
#define SEAMX_LITTLE_ENDIAN 1

int getMachineEndianness();

/*
  Swap bytes for each number in the array.
  Array has [arrsize] elements, each [atomsize] bytes long.
*/
void swapBytes(unsigned char *arr, int arrsize, int atomsize);
/*----------------------------------------------------------------------------*/

#endif

---