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/usr/include/macro_api.h is in libmetview-dev 4.8.0-4.

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The actual contents of the file can be viewed below.

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/***************************** LICENSE START ***********************************

 Copyright 2012 ECMWF and INPE. This software is distributed under the terms
 of the Apache License version 2.0. In applying this license, ECMWF does not
 waive the privileges and immunities granted to it by virtue of its status as
 an Intergovernmental Organization or submit itself to any jurisdiction.

 ***************************** LICENSE END *************************************/

/*--  Header file for Metview Macro C/C++ interface functions  --*/

#ifndef MACRO_API_H
#define MACRO_API_H

#include "grib_api.h"

#ifndef fortint
#define fortint int
#endif

#ifndef fortfloat
#define fortfloat double
#endif

#define MV_ALLOW_DEPRECATED_MCI_NAMES 1


#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif


/*------------------------  macro C/C++ interface routines --------------------------*/

      /*--   'mci_' : M(acro) C I(nterface)   --*/

      double  mci_get_number();
        void  mci_return_number( double d );

  const char* mci_get_string();
        void  mci_return_string( const char* s );

        void  mci_get_vector( double** vec, int* length );
        void  mci_return_vector( double* vec, int length );

        void* mci_get_fieldset( int* field_count );/* use 'void*' in order to hide 'mars.h' */
 grib_handle* mci_load_one_grib( void* fieldset_ptr ); /* handle must be deleted by calling pgm */
        void  mci_rewind_fieldset( void* fieldset_ptr );

        void* mci_new_fieldset();                  /* use 'void*' in order to hide 'mars.h' */
        void  mci_save_grib( void* fieldset_ptr, grib_handle* gh );
        void  mci_return_fieldset( void* fieldset_ptr );

#ifdef MV_ALLOW_DEPRECATED_MCI_NAMES
        /*--  old names that confusingly use 'grib_id' for a 'fieldset' --*/
        void* mci_get_grib_id_ptr( int* field_count ); /* mci_get_fieldset()    */
        void  mci_rewind_grib( void* grib_id_ptr );    /* mci_rewind_fieldset() */
        void* mci_new_grib_id_ptr();                   /* mci_new_fieldset()    */
        void  mci_return_grib( void* grib_id_ptr );    /* mci_return_fieldset() */
#endif

         int  mci_arg_count();
  const char* mci_args();
        void  mci_fail( const char* msg );


/*---------------------- second generation macro Fortran interface routines -----------------------*/

        /*-- 'mfi_' : M(acro) F(ortran) I(nterface) / functions written in C --*/

        void  mfi_get_number_( fortfloat* d );
        void  mfi_return_number_( fortfloat* d );

        void  mfi_get_string_( char* s, fortint s_len );
        void  mfi_return_string_( char* s, fortint s_len );

        void  mfi_get_vector_( double* vec, int* length );
        void  mfi_return_vector_( double* vec, int* length );

        void  mfi_get_fieldset_( fortint* fieldset_id_index, fortint* field_count );
        void  mfi_rewind_fieldset_( fortint* fieldset_id );

        void  mfi_new_fieldset_( fortint* fieldset_id_index );
        void  mfi_return_fieldset_( fortint* fieldset_id );

        void  mfi_args_( fortint* c, char* a, fortint a_len );
        void  mfi_fail_( char* msg, fortint a_len );

        /*--  'mfi_' : M(acro) F(ortran) I(nterface) / routines written in Fortran 90  --*/

/*      subroutine mfi_load_one_grib( ifieldset_id, igrib_id ) - implemented in Fortran90 */
/*      subroutine mfi_save_grib( ifieldset_id, igrib_id )     - implemented in Fortran90 */


        /*-- 'mifi_' : M(acro) I(nternal) F(ortran) I(nterface) --*/

        void  mifi_get_msg_length_( fortint* fieldset_id_index, fortint* msg_len );
        void  mifi_load_one_grib_to_memory_( fortint* fieldset_id_index, char* grib_in_memory );
        void  mifi_save_one_grib_to_file_( fortint* fieldset_id_index, char* grib_data, fortint *bytecount );


/*-- original first generation Fortran callable interface (sub)routines --*/

void mnewb_();                               /*-- b: BUFR - not yet implemented --*/
void mgetb_();
void msetb_();
void mloadb_();
void msaveb_();

void mgetg_(fortint* g, fortint* c);               /*-- g: fieldsets (GRIB msgs) --*/
void mloadg_(fortint* g, char* p, fortint* c);
void mrewg_(fortint* g);
void mnewg_(fortint* g);
void msaveg_(fortint* g, char* p, fortint* c);
void msavebyteg_(fortint* g, char* p, fortint* c);
void msetg_(fortint* g);

void mgeti_(fortint* g, fortint* c);               /*-- i: images --*/
void mseti_(fortint* g);

void mgetm_();                               /*-- m: matrices - not yet implemented --*/
void msetm_();

void mgetn_(fortfloat* f);                   /*-- n: floats (numbers, size of  Fortran REAL) --*/
void msetn_(fortfloat* f);

void mgetn2_(double* d);                     /*-- n2: doubles (numbers, size of C double) --*/
void msetn2_(double* d);

void mgets_(char* s, fortint l_s);              /*-- s: strings --*/
void msets_(char* s, fortint l_s);

void mgetv_(fortint* s, fortfloat* v);       /*-- v: vectors --*/
void msetv_(fortint* s, fortfloat* v);

                                             /*-- miscellenius --*/
void margs_(fortint* cnt, char* types, fortint l_types);
void mfail_(char* msg, fortint l_msg);

#if defined(__cplusplus) || defined(c_plusplus)
}
#endif

#endif
/*-- MACRO_API_H --*/