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/*
* (C) Copyright 2005- ECMWF.
*
* This software is licensed under the terms of the Apache Licence Version 2.0
* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
*
* In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
* virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
*/
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "grib_api.h"
void usage(const char *prog)
{
fprintf(stderr,"%s: in1 [in2 ... ] out\n",prog);
exit(1);
}
grib_values values[10240];
int main(int argc, const char *argv[])
{
int i,j;
FILE *in,*out;
int e;
grib_handle *result = NULL,*h;
double* values = NULL;
double *tmp = NULL;
size_t size,count;
if(argc < 3) usage(argv[0]);
out = fopen(argv[argc-1],"w");
if(!out) {
perror(argv[argc-1]);
exit(1);
}
for(i = 1; i < argc-1; i++)
{
in = fopen(argv[i],"r");
if(!in) {
perror(argv[i]);
exit(1);
}
while( (h = grib_handle_new_from_file(NULL,in,&e)) != NULL )
{
if(result == NULL)
{
GRIB_CHECK(grib_get_size(h,"values",&size),argv[i]);
values = (double*)calloc(size,sizeof(double));
assert(values);
tmp = (double*)calloc(size,sizeof(double));
assert(tmp);
result = h;
}
GRIB_CHECK(grib_get_size(h,"values",&count),argv[i]);
assert(count == size);
GRIB_CHECK(grib_get_double_array(h,"values",tmp,&count),argv[i]);
assert(count == size);
for(j = 0; j < count; j++)
values[j] += tmp[j];
if(h != result)
grib_handle_delete(h);
}
GRIB_CHECK(e,argv[argc-2]);
}
if(result)
{
const void *buffer;
GRIB_CHECK(grib_set_double_array(result,"values",values,size),argv[i]);
GRIB_CHECK(grib_get_message(result,&buffer,&size),argv[0]);
if(fwrite(buffer,1,size,out) != size)
{
perror(argv[argc-1]);
exit(1);
}
grib_handle_delete(result);
}
if(fclose(out))
{
perror(argv[argc-1]);
exit(1);
}
return 0;
}
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