ncvar_attr.c
1.49 KB
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/*
* get parameter info from nc file
* args : ncfile varId infoId
* infoId :
* UNITS
* FILLVALUE
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netcdf.h>
void check(int stat)
{
if (stat != NC_NOERR)
{
printf("error: %s\n", nc_strerror(stat));
exit(1);
}
}
main(int argc, char **argv)
{
int ncID, varID;
size_t i, k;
// char varname[NC_MAX_NAME];
int stat = 0;
nc_type xtype;
char name_in[NC_MAX_NAME];
float number_attr;
int nattsp;
if (argc <= 3) {
printf("Incorrect number of arguments\n");
exit(1);
}
check(nc_open(argv[1],NC_WRITE|NC_SHARE,&ncID));
check(nc_inq_varid(ncID, argv[2], &varID));
check(nc_inq_varnatts(ncID, varID, &nattsp));
// fprintf(stdout, "%d\n", nattsp);
for (i = 0; i < nattsp; i++) {
check(nc_inq_attname(ncID, varID, i, name_in));
if (strcasecmp(name_in, argv[3]) == 0) {
check(nc_inq_atttype(ncID, varID, name_in, &xtype));
if (xtype == NC_CHAR) {
size_t attlen = 0;
check(nc_inq_attlen(ncID, varID, name_in, &attlen));
unsigned char *string_attr = (unsigned char *)malloc(attlen * sizeof(char*) + 1);
check(nc_get_att(ncID, varID, name_in, string_attr));
strcpy(&string_attr[attlen],"\0");
fprintf(stdout, "%s\n", string_attr);
free(string_attr);
}
else {
check(nc_get_att(ncID, varID, name_in, &number_attr));
fprintf(stdout, "%e\n", number_attr);
}
exit(0);
}
}
stat = nc_close(ncID);
fprintf(stdout, "undefined\n");
exit(0);
}