ncinfo_remote.c
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/*
* get parameter info from CDAWEB dataset nc file
* args : ncfile varId infoId
* infoId :
* 0 - dimension
* 1 - labels
* 2 - units
* 3 - fillvalue
* 4 - is virtual
* 5 - is spectra
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netcdf.h>
void check(int stat)
{
if (stat != NC_NOERR)
{
fprintf(stdout,"Unknown");
// printf("NetCDF error: %s\n", nc_strerror(stat));
exit(1);
}
}
main(int argc, char **argv)
{
int ncID, varID, labelID, ndims, dimids[NC_MAX_DIMS];
size_t i, k;
// char varname[NC_MAX_NAME];
int stat = 0;
nc_type xtype;
size_t start[] = {0, 0};
size_t count[] = {1, 0};
size_t size, length;
int infoId;
float number_attr;
const char *info[4];
info[0] = "UNITS";
info[1] = "_FillValue";
info[2] = "FILLVAL";
info[3] = "VIRTUAL";
info[4] = "DISPLAY_TYPE";
info[5] = "DEPEND_1";
if (argc <= 3) {
printf("Incorrect number of arguments\n");
exit(1);
}
infoId = atoi(argv[3]);
stat = nc_open(argv[1],0,&ncID); check(stat);
stat = nc_inq_varid(ncID, argv[2], &varID); check(stat);
stat = nc_inq_varndims(ncID, varID, &ndims); check(stat);
stat = nc_inq_vardimid(ncID, varID, dimids); check(stat);
size_t len = 0;
// size
if (ndims > 1)
for (i = 1; i < ndims; i++) {
stat = nc_inq_dimlen(ncID, dimids[i], &len); check(stat);
if (infoId == 0)
{
fprintf(stdout, "%d ", len);
}
}
else
if (infoId == 0)
{
fprintf(stdout,"%d ", len);
}
if (infoId == 1) // components
{
size_t attlen = 0;
stat = nc_inq_attlen(ncID, varID, "LABL_PTR_1", &attlen);
if (stat != NC_NOERR) {
fprintf(stdout, "-1");
exit(0);
}
unsigned char *string_attr = (unsigned char *)malloc(attlen * sizeof(char*));
memset(string_attr, 0, attlen * sizeof(char*));
stat = nc_get_att(ncID, varID, "LABL_PTR_1", string_attr);
if (stat != NC_NOERR) {
fprintf(stdout, "-1");
exit(0);
}
stat = nc_inq_varid(ncID, string_attr, &labelID);
if (stat != NC_NOERR) {
fprintf(stdout, "-1");
exit(0);
}
stat = nc_inq_varndims(ncID, labelID, &ndims);
if (stat != NC_NOERR) {
fprintf(stdout, "-1");
exit(0);
}
stat = nc_inq_vardimid(ncID, labelID, dimids);
if (stat != NC_NOERR) {
fprintf(stdout, "-1");
exit(0);
}
for (i = 0; i < ndims; i++) {
stat = nc_inq_dimlen(ncID, dimids[i], &len); check(stat);
if (i == 0) size = len;
if (i == 1) length = len;
}
count[1] = length;
unsigned char *string_var = (unsigned char *)malloc(length * sizeof(char*));
for (i = 0; i < size; i++)
{
memset(string_var, 0, length * sizeof(char*));
stat = nc_get_vara(ncID, labelID, start, count, string_var); check(stat);
fprintf(stdout, "%s", string_var);
if (i < size -1) fprintf(stdout,",");
start[0]++;
}
free(string_attr);
free(string_var);
}
if (infoId == 2) // Units
{
size_t attlen = 0;
stat = nc_inq_attlen(ncID, varID, info[infoId-2], &attlen); check(stat);
unsigned char *string_attr = (unsigned char *)malloc(attlen * sizeof(char*));
memset(string_attr, 0, attlen * sizeof(char*));
stat = nc_get_att(ncID, varID, info[infoId-2], string_attr); check(stat);
fprintf(stdout, "%s", string_attr);
free(string_attr);
}
if (infoId == 3) // Fill Value
{
stat = nc_get_att(ncID, varID, info[infoId-2], &number_attr);
if (stat != NC_NOERR) {
stat = nc_get_att(ncID, varID, info[infoId-1], &number_attr);
check(stat);
}
fprintf(stdout, "%e", number_attr);
}
if (infoId == 4) // is virtual
{
size_t attlen = 0;
stat = nc_inq_attlen(ncID, varID, info[infoId-1], &attlen);
if (stat != NC_NOERR) {
fprintf(stdout, "1");
}
else {
fprintf(stdout, "0");
}
}
if (infoId == 5) // is spectrogram
{
size_t attlen = 0;
stat = nc_inq_attlen(ncID, varID, info[infoId-1], &attlen);
if (stat != NC_NOERR) {
fprintf(stdout, "0");
}
else {
unsigned char *string_attr = (unsigned char *)malloc(attlen * sizeof(char*));
memset(string_attr, 0, attlen * sizeof(char*));
stat = nc_get_att(ncID, varID, info[infoId-1], string_attr);
if (strcasecmp(string_attr,"spectrogram") != 0)
fprintf(stdout, "0");
else
fprintf(stdout, "1");
free(string_attr);
}
}
stat = nc_close(ncID);
exit(0);
}