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/*********************************************************************
* Copyright 1993, UCAR/Unidata
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
* Derived from poco library from Boost Software: see nccpoco/SourceLicense file.
*********************************************************************/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "netcdf.h"
#include "ncpoco.h"
/**************************************************/
#ifdef _WIN32
extern struct NCPAPI ncp_win32_api;
#else
extern struct NCPAPI ncp_unix_api;
#endif
/**************************************************/
/* Creates a SharedLib object. */
EXTERNL int
ncpsharedlibnew(NCPSharedLib** libp)
{
int ret = NC_NOERR;
NCPSharedLib* lib;
lib = (NCPSharedLib*)calloc(1,sizeof(NCPSharedLib));
if(lib == 0)
{ret = NC_ENOMEM; goto done;}
/* fill in the api */
#ifdef _WIN32
lib->api = ncp_win32_api;
#else
lib->api = ncp_unix_api;
#endif
ret = lib->api.init(lib);
if(ret == NC_NOERR && libp)
*libp = lib;
done:
return ret;
}
/* free this shared library */
EXTERNL int
ncpsharedlibfree(NCPSharedLib* lib)
{
int ret = NC_NOERR;
if(lib == NULL) return NC_NOERR;
ret = lib->api.unload(lib);
ret = lib->api.reclaim(lib);
/* reclaim common stuff */
nullfree(lib->path);
free(lib);
return ret;
}
/*
Loads a shared library from the given path using specified flags.
Returns error if a library has already been loaded or cannot be loaded.
*/
EXTERNL int
ncpload(NCPSharedLib* lib, const char* path, int flags)
{
if(lib == NULL || path == NULL) return NC_EINVAL;
ncpclearerrmsg(lib);
return lib->api.load(lib,path,flags);
}
EXTERNL int
ncpunload(NCPSharedLib* lib) /* Unloads a shared library. */
{
if(lib == NULL) return NC_EINVAL;
ncpclearerrmsg(lib);
return lib->api.unload(lib);
}
EXTERNL int
ncpisloaded(NCPSharedLib* lib) /* Returns 1 iff a library has been loaded. */
{
if(lib == NULL) return 0;
return lib->api.isloaded(lib);
}
/* Returns the address of the symbol with the given name.
For functions, this is the entry point of the function.
Return error if the symbol does not exist
*/
EXTERNL void*
ncpgetsymbol(NCPSharedLib* lib,const char* name)
{
if(lib == NULL) return NULL;
ncpclearerrmsg(lib);
return lib->api.getsymbol(lib,name);
}
/* Returns the path of the library, as specified in
a call to load()
*/
EXTERNL const char*
ncpgetpath(NCPSharedLib* lib)
{
if(lib == NULL) return NULL;
return lib->api.getpath(lib);
}
/* Returns the last err msg. */
EXTERNL const char*
ncpgeterrmsg(NCPSharedLib* lib)
{
if(lib == NULL) return NULL;
return (lib->err.msg[0] == '\0' ? NULL : lib->err.msg);
}
/* Clear the last err msg. */
EXTERNL void
ncpclearerrmsg(NCPSharedLib* lib)
{
if(lib == NULL) return;
memset(lib->err.msg,0,sizeof(lib->err.msg));
}
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