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/usr/include/scilab/mex.h is in scilab-include 5.5.2-4+b1.

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/*
 * Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
 * Copyright (C) INRIA
 * Copyright (C) ENPC
 *
 * This file must be used under the terms of the CeCILL.
 * This source file is licensed as described in the file COPYING, which
 * you should have received as part of this distribution.  The terms
 * are also available at
 * http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
 *
 */

#ifdef __cplusplus
extern "C" {
#endif

#ifndef SCI_MEX
#define SCI_MEX

#ifdef WIN32
#include <stddef.h> /*for LCC */
#endif

#define __MEX_INCLUDE__
#include "stack-c.h"
#undef __MEX_INCLUDE__

    typedef int Matrix;
    typedef unsigned long int vraiptrst;
#ifndef __DEF_MXARRAY__
#define __DEF_MXARRAY__
    typedef int mxArray;
    typedef int Gatefunc (int nlhs, mxArray *plhs[], int nrhs, mxArray *prhs[]);
#endif

    typedef int (*GatefuncH) (int nlhs, mxArray *plhs[], int nrhs, mxArray *prhs[]);

    typedef int (*FGatefuncH) (int *nlhs, mxArray *plhs[], int *nrhs, mxArray *prhs[]);

    typedef int (*Myinterfun) (char *, GatefuncH F);

    typedef int (*GT) ();

#ifndef __DEF_TABLE_STRUCT__
#define __DEF_TABLE_STRUCT__
    typedef struct table_struct
    {
        Myinterfun f;    /** interface **/
        GT F;     /** function **/
        char *name;      /** its name **/
    } GenericTable;
#endif

#define mxLOGICAL int
#define mxLogical int

#define REAL    0
#define COMPLEX 1

#ifndef NULL
#define NULL 0
#endif

#define mxCreateFull mxCreateDoubleMatrix

#ifndef __cplusplus
#ifndef bool
#define bool int
#endif
#endif

    /* mexGetMatrixPtr - mexGetArrayPtr : NOT IN MATLAB API - V6.4 compatible*/
#define mexGetMatrixPtr(name) mexGetArrayPtr(name, "caller")

    /* mexGetArray : NOT IN MATLAB API - V6.4 compatible*/
#define mexGetArrayPtr(name,type) mexGetArray(name,type)

    void mexPrintf(const char *fmt, ...);
    void C2F(mexprintf)(char *error_msg, int len);

    /* mexPutFull: NOT IN MATLAB API - V4 compatible */
    /** Put a matrix in Scilab Workspace */
#define mexPutFull(name,m,n,ptrM,tag)					\
  if ( ! C2F(cwritemat)(name,(c_local=m,&c_local),(c1_local=n,&c1_local),ptrM,strlen(name))) { \
      mexErrMsgTxt(_("mexPutFull failed\n"));return; }

    /* prototypes */

    /* mexInfo: NOT IN MATLAB API - SCILAB SPECIFIC ?*/
    void mexInfo (char *);

    /* mexCheck: NOT IN MATLAB API - SCILAB SPECIFIC ?*/
    int mexCheck (char *, int );

    mxArray *mxCreateCharMatrixFromStrings (int m, const char **str);
    mxArray *mxCreateString (const char *string);
    mxArray *C2F(mxcreatestring)  (char *string, long int l);
    /* mxcreatefull : NOT IN MATLAB API - v4 compatible */
    mxArray *C2F(mxcreatefull)  (int *m, int *n, int *it);
    mxArray *mxCreateCharArray (int ND, const int *size);

    mxArray *mxCreateCellArray (int ND, const int *size);
    mxArray *mxCreateCellMatrix (int m, int n);

    mxArray *mxCreateStructArray (int ndim, const int *dims, int nfields, const char **field_names);
    mxArray *mxCreateStructMatrix (int m, int n, int nfields, const char **field_names);

    mxArray *mxGetCell (const mxArray *ptr, int index);

    double mxGetScalar (const mxArray *ptr);
    double C2F(mxgetscalar)  (mxArray *ptr);
    double *mxGetPi (const mxArray *ptr);
    double * C2F(mxgetpi)  (mxArray *ptr);
    double *mxGetPr (const mxArray *ptr);
    double * C2F(mxgetpr)  (mxArray *ptr);
    double mxGetInf (void);
    double mxGetNaN (void);
    double mxGetEps (void);
    bool mxIsNaN (double x);
    bool mxIsInf (double x);
    bool mxIsFinite (double x);
    int *mxGetDimensions (const mxArray *ptr);
    int mxCalcSingleSubscript (const mxArray *ptr, int nsubs, const int *subs);
    int mxGetNumberOfElements (const mxArray *ptr);
    int mxGetNumberOfDimensions(const mxArray *ptr);
    int mxGetNumberOfFields(const mxArray *ptr);
    void *mxGetData(const mxArray *ptr);
    void *mxGetImagData(const mxArray *ptr);

    void clear_mex(int nlhs, mxArray **plhs, int nrhs, mxArray **prhs);

    extern void errjump ();

    int mxGetM (const mxArray *ptr);
    int  C2F(mxgetm)  (mxArray *ptr);
    int mxGetN (const mxArray *ptr);
    int  C2F(mxgetn)  (mxArray *ptr);
    int mxGetString (const mxArray *ptr, char *str, int strl);
    int  C2F(mxgetstring)  (mxArray *ptr, char *str, int *strl);
    bool mxIsComplex (const mxArray *ptr);
    int  C2F(mxiscomplex)  (mxArray *ptr);
    /* mxisfull : NOT IN MATLAB API - v4 compatible */
    bool mxIsFull (const mxArray *ptr);
    int  C2F(mxisfull)  (mxArray *ptr);
    bool mxIsNumeric (const mxArray *ptr);
    int  C2F(mxisnumeric)  (mxArray *ptr);
    bool mxIsSparse (const mxArray *ptr);
    int  C2F(mxissparse)  (mxArray *ptr);
    /* mxisstring : NOT IN MATLAB API - v6.0 compatible */
    bool mxIsString (const mxArray *ptr);
    int  C2F(mxisstring)  (mxArray *ptr);
    int *mxGetIr (const mxArray *ptr);
    int *mxGetJc (const mxArray *ptr);

    /**
     * TODO : comment
     * @param type
     * @param m
     * @param n
     * @param it
     * @param lr
     * @param ptr
     * @param type_len
     * @return
     */
    int C2F(createptr)  (char *type, int *m, int *n, int *it, int *lr, int *ptr, long int type_len);

    /**
     * TODO : comment
     * @param m
     * @param ptr
     * @return
     */
    int C2F(createstkptr)  (int *m, vraiptrst *ptr);


    /**
     * TODO : comment
     * @param nlhs
     * @param plhs
     * @param nrhs
     * @param prhs
     * @return
     */
    int C2F(endmex)  (int *nlhs, mxArray **plhs, int *nrhs, mxArray **prhs);


    /**
     * TODO : comment
     * @param nlhs
     * @param plhs
     * @param nrhs
     * @param prhs
     * @return
     */
    int C2F(initmex)  (int *nlhs, mxArray **plhs, int *nrhs, mxArray **prhs);

    int C2F(mexcallscilab)  (int *nlhs, mxArray **plhs, int *nrhs, mxArray **prhs, char *name, int namelen);
    int C2F(mxcopyptrtoreal8)  (mxArray *ptr, double *y, int *n);
    int C2F(mxcopyreal8toptr)  (double *y, mxArray *ptr, int *n);
    int fortran_mex_gateway (char *fname, FGatefuncH F);
    int mexAtExit (mxArray *ptr);
    int mexCallSCILAB (int nlhs, mxArray **plhs, int nrhs, mxArray **prhs, const char *name);
    int mexCallMATLAB (int nlhs, mxArray **plhs, int nrhs, mxArray **prhs, const char *name);
    int mex_gateway (char *fname, GatefuncH F);
    int mxGetElementSize (const mxArray *ptr);
    int mxGetNzmax (const mxArray *ptr);
    char *mxArrayToString (const mxArray *array_ptr);
    bool mxIsDouble (const mxArray *ptr);
    bool mxIsSingle (const mxArray *ptr);
    bool mxIsLogical (const mxArray *ptr);
    bool mexIsGlobal(const mxArray *ptr);
    /* mxsetlogical: NOT IN MATLAB API - v6.5 compatible */
    void mxSetLogical (mxArray *ptr);
    /* mxclearlogical: NOT IN MATLAB API - v6.5 compatible */
    void mxClearLogical (mxArray *ptr);
    bool mxIsChar (const mxArray *ptr);
    bool mxIsEmpty (const mxArray *ptr);
    bool mxIsClass (const mxArray *ptr, const char *name);
    bool mxIsCell (const mxArray *ptr);
    bool mxIsStruct (const mxArray *ptr);

    bool mxIsInt8(const mxArray *ptr);
    bool mxIsInt16(const mxArray *ptr);
    bool mxIsInt32(const mxArray *ptr);
    bool mxIsUint8(const mxArray *ptr);
    bool mxIsUint16(const mxArray *ptr);
    bool mxIsUint32(const mxArray *ptr);
    /* mxIsUint64 missing */

    void mxSetM(mxArray *ptr, int m);
    void mxSetN(mxArray *ptr, int n);
    void mxSetJc(mxArray *array_ptr, int *jc_data);
    void mxSetIr(mxArray *array_ptr, int *ir_data);
    void mxSetNzmax(mxArray *array_ptr, int nzmax);
    void mxSetCell(mxArray *pa, int i, mxArray *value);

    /* mexGetArray: NOT IN MATLAB API - v6.5 compatible */
    mxArray *mexGetArray(char *name, char *workspace);
    mxArray *mexGetVariable(const char *workspace, const char *name);
    const mxArray *mexGetVariablePtr(const char *workspace, const char *name);

    unsigned long int C2F(mxcalloc)(unsigned int *n, unsigned int *size);
    void *mxCalloc(size_t n, size_t size);
    void *mxMalloc(size_t nsize);
    void mxFree(void *ptr);
    void mxDestroyArray(mxArray *ptr);

    /* mxCalloc_m : NOT IN MATLAB API - SCILAB SPECIFIC ?*/
    void *mxCalloc_m(unsigned int n, unsigned int size);
    /* mxMalloc_m : NOT IN MATLAB API - SCILAB SPECIFIC ?*/
    void *mxMalloc_m(unsigned int nsize);
    /* mxFree_m : NOT IN MATLAB API - SCILAB SPECIFIC ?*/
    void  mxFree_m(void *);
    /* mxfreematrix: NOT IN MATLAB API - v6.0 compatible */
    void mxFreeMatrix(mxArray *ptr);
    void C2F(mxfreematrix)(mxArray *ptr);

    void mexErrMsgTxt(const char *error_msg);
    void C2F(mexerrmsgtxt)(char *error_msg, int len);
    int  mexEvalString(const char *name);
    void mexWarnMsgTxt(const char *error_msg);
    /* mexprint: NOT IN MATLAB API - SCILAB SPECIFIC ?*/
    void mexprint(char* fmt, ...);

    int mxGetFieldNumber(const mxArray *ptr, const char *string);
    mxArray *mxGetField(const mxArray *pa, int i, const char *fieldname);
    void  mxSetFieldByNumber(mxArray *array_ptr, int index, int field_number, mxArray *value);
    void mxSetField (mxArray *pa, int i, const char *fieldname, mxArray *value);

    mxArray *mxGetFieldByNumber(const mxArray *ptr, int index, int field_number);
    const char *mxGetFieldNameByNumber(const mxArray *array_ptr, int field_number);
    mxLOGICAL *mxGetLogicals (const mxArray *array_ptr);

    /**
     * TODO : comment
     * @param x
     * @return
     */
    vraiptrst C2F(locptr)(void *x);

    typedef enum
    {
        mxCELL_CLASS = 1,
        mxSTRUCT_CLASS,
        mxOBJECT_CLASS,
        mxCHAR_CLASS,
        mxSPARSE_CLASS,
        mxDOUBLE_CLASS,
        mxSINGLE_CLASS,
        mxINT8_CLASS,
        mxUINT8_CLASS,
        mxINT16_CLASS,
        mxUINT16_CLASS,
        mxINT32_CLASS,
        mxUINT32_CLASS,
        mxUNKNOWN_CLASS = 0
    } mxClassID;

    typedef enum { mxREAL, mxCOMPLEX } mxComplexity;

    mxClassID mxGetClassID(const mxArray *ptr);
    /* mxGetName: NOT IN MATLAB API - v6.4 compatible */
    const char *mxGetName(const mxArray *array_ptr);
    /* mxSetName: NOT IN MATLAB API - v6.4 compatible */
    void mxSetName( mxArray    *pa,    const char *s );
    void mxSetPr(mxArray *array_ptr, double *pr);
    void mxSetPi(mxArray *array_ptr, double *pi);
    void mxSetData(mxArray *array_ptr, void *pr);
    mxArray *mxCreateNumericArray(int ndim, const int *dims, mxClassID classid, mxComplexity flag);
    mxArray *mxCreateNumericMatrix(int m, int n, mxClassID classid, int cmplx_flag);
    int mxSetDimensions(mxArray *array_ptr, const int *dims, int ndim);
    mxArray *mxCreateDoubleMatrix(int m, int n, mxComplexity it);
    mxArray *mxCreateDoubleScalar(double value);
    mxArray *mxCreateSparse(int m, int n, int nzmax, mxComplexity cmplx);
    mxArray *mxDuplicateArray(const mxArray *ptr);

    /* typedef uint16_T mxChar; */

    /* typedef short int mxChar; */
    typedef unsigned short mxChar;

#define INT8_T   char
#define UINT8_T  unsigned char
#define INT16_T  short
#define UINT16_T unsigned short
#define INT32_T  int
#define UINT32_T unsigned int
#define REAL32_T float

    typedef INT8_T   int8_T;
    typedef UINT8_T  uint8_T;
    typedef INT16_T  int16_T;
    typedef UINT16_T uint16_T;
    typedef INT32_T  int32_T;
    typedef UINT32_T uint32_T;
    typedef REAL32_T real32_T;

    typedef int       mwSize;
    typedef int       mwIndex;
    typedef mxArray * mwPointer;

#endif /* SCI_MEX  */

#ifdef __cplusplus
}
#endif

/* generic mexfunction name */
#ifdef __cplusplus
extern "C" {
    void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[]);
}
#endif