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https://github.com/Unidata/netcdf-c.git
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115 lines
2.3 KiB
C
115 lines
2.3 KiB
C
/*********************************************************************
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Copyright 2010, UCAR/Unidata See netcdf/COPYRIGHT file for
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copying and redistribution conditions.
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*********************************************************************/
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#include <config.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include "nc.h"
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#define ID_SHIFT (16)
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#define NCFILELISTLENGTH 0x10000
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/* Version one just allocates the max space (sizeof(NC*)*2^16)*/
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static NC** nc_filelist = NULL;
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static int numfiles = 0;
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/* Common */
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int
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count_NCList(void)
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{
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return numfiles;
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}
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void
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free_NCList(void)
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{
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if(numfiles > 0) return; /* not empty */
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if(nc_filelist != NULL) free(nc_filelist);
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nc_filelist = NULL;
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}
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int
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add_to_NCList(NC* ncp)
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{
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int i;
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int new_id;
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if(nc_filelist == NULL) {
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if (!(nc_filelist = calloc(1, sizeof(NC*)*NCFILELISTLENGTH)))
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return NC_ENOMEM;
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numfiles = 0;
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}
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#ifdef USE_REFCOUNT
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/* Check the refcount */
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if(ncp->refcount > 0)
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return NC_NOERR;
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#endif
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new_id = 0; /* id's begin at 1 */
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for(i=1; i < NCFILELISTLENGTH; i++) {
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if(nc_filelist[i] == NULL) {new_id = i; break;}
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}
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if(new_id == 0) return NC_ENOMEM; /* no more slots */
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nc_filelist[new_id] = ncp;
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numfiles++;
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new_id = (new_id << ID_SHIFT);
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ncp->ext_ncid = new_id;
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return NC_NOERR;
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}
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void
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del_from_NCList(NC* ncp)
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{
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unsigned int ncid = ((unsigned int)ncp->ext_ncid) >> ID_SHIFT;
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if(numfiles == 0 || ncid == 0 || nc_filelist == NULL) return;
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if(nc_filelist[ncid] != ncp) return;
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#ifdef USE_REFCOUNT
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/* Check the refcount */
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if(ncp->refcount > 0)
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return; /* assume caller has decrecmented */
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#endif
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nc_filelist[ncid] = NULL;
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numfiles--;
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/* If all files have been closed, release the filelist memory. */
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if (numfiles == 0)
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free_NCList();
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}
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NC *
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find_in_NCList(int ext_ncid)
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{
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NC* f = NULL;
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unsigned int ncid = ((unsigned int)ext_ncid) >> ID_SHIFT;
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if(numfiles > 0 && nc_filelist != NULL && ncid < NCFILELISTLENGTH)
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f = nc_filelist[ncid];
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return f;
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}
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/*
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Added to support open by name
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*/
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NC*
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find_in_NCList_by_name(const char* path)
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{
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int i;
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NC* f = NULL;
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if(nc_filelist == NULL)
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return NULL;
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for(i=1; i < NCFILELISTLENGTH; i++) {
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if(nc_filelist[i] != NULL) {
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if(strcmp(nc_filelist[i]->path,path)==0) {
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f = nc_filelist[i];
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break;
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}
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}
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}
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return f;
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}
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