mirror of https://github.com/ecmwf/eccodes.git
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
/*
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* Copyright 2005-2019 ECMWF.
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*
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* This software is licensed under the terms of the Apache Licence Version 2.0
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* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
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*
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* In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
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* virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
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*/
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#include "config.h"
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#include "grib_api_internal.h"
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#ifndef ECCODES_ON_WINDOWS
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#include <unistd.h>
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#endif
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void usage(char* prog) {
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printf("usage: %s filename\n",prog);
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exit(1);
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}
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int main(int argc,char* argv[]) {
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off_t offsetin=0,offsetout=0;
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off_t size=100000000;
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size_t rsizein=10,rsizeout=0;
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double doff=0;
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FILE* f=0;
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char str[10];
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int i;
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if (argc != 2) usage(argv[0]);
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printf("sizeof(off_t)=%d sizeof(long)=%d\n",sizeof(off_t),sizeof(long));
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f=fopen(argv[1],"r");
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if (!f) {
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printf("%s\n",strerror(errno));
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exit(errno);
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}
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offsetin=size;
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for (i=0;i<100000;i++) {
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printf("i=%d ",i);
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if (fseeko(f,offsetin,SEEK_SET) ) {
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printf("fseeko error\n");
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printf("- %d - %s\n",errno,strerror(errno));
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exit(1);
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}
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rsizeout=fread(str,1,rsizein,f);
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if (rsizeout != rsizein ) {
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printf("rsizein=%d rsizeout=%d\n",rsizein,rsizeout);
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printf("end of file\n");
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exit(1);
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}
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offsetout=ftello(f);
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doff=(double)offsetout;
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printf("%20.0f \n",doff);
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if (offsetout != offsetin+rsizeout) {
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printf("offset error: offsetout=%jd offsetin=%jd\n",offsetout,offsetin+rsizeout);
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exit(1);
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}
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offsetin=offsetout+size;
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}
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fclose(f);
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return 0;
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}
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