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dat1IsTopLevel.c
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dat1IsTopLevel.c
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/*
*+
* Name:
* dat1IsTopLevel
* Purpose:
* Test if a locator is for a top level object.
* Language:
* Starlink ANSI C
* Type of Module:
* Library routine
* Invocation:
* int dat1IsTopLevel( const HDSLoc *loc, int *status );
* Arguments:
* loc = const HDSLoc * (Given)
* Pointer to a locator for the HDF object that is to be tested.
* status = int* (Given and Returned)
* Pointer to global status.
* Returned function value:
* Non-zero if the locator is for a top-levbel object, and zero
* otherwise.
* Description:
* A non-zero value is returned if the supplied locator is for a
* top-level object.
* Notes:
* - Zero will be returned if an error has already occurred, or if
* this function fails for any reason.
* Authors:
* DSB: David S Berry (EAO)
* {enter_new_authors_here}
* History:
* 2-MAY-2019 (DSB):
* Initial version
* 16-MAY-2019 (DSB):
* If the container file name has more than DAT__SZNAM (15) characters,
* the name stored in the handle associated with the top level object
* will be truncated and so will not equal the name of the container
* file. So only use the first DAT__SZNAM characters when comparing
* the handle name with the container file name.
* 7-MAY-2020 (DSB):
* The name associated with the top-level handle may include a directory
* path. This needs to be removed before comparing it with the name from
* the supplied handle, which will never include a path.
* {enter_further_changes_here}
* Copyright:
* Copyright (C) 2019 East Asian Observatory
* All Rights Reserved.
* Licence:
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* - Neither the name of the {organization} nor the names of its
* contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
* Bugs:
* {note_any_bugs_here}
*-
*/
#include <strings.h>
#include <string.h>
#include <pthread.h>
#include "ems.h"
#include "sae_par.h"
#include "dat1.h"
#include "dat_err.h"
#if __MINGW32__
/* Use Windows separator */
#define DIRSEP '\\'
#else
#define DIRSEP '/'
#endif
int dat1IsTopLevel( const HDSLoc *loc, int *status ){
/* Local Variables; */
const char *pname;
int result;
Handle *parent;
/* Initialise */
result = 0;
/* Return immediately if an error has already occurred. */
if( *status != SAI__OK ) return result;
/* If the locator's handle has no parent, it is a top level locator. */
parent = loc->handle->parent;
if( !parent ) {
result = 1;
/* Otherwise, if the parent handle has no parent, and the locator's
handle and the parent handle are for the same object (allowing for
truncation of the object name to DAT__SZNAM characters), it is a
top level locator. */
} else if( !parent->parent && loc->handle->name && parent->name ) {
/* If the parent name contains a directory path, get a pointer to the
first character in the file name. */
pname = strrchr( parent->name, DIRSEP );
if( pname ) {
pname++;
} else {
pname = parent->name;
}
/* Do the comparison, case-insensitive. */
result = !strncasecmp( loc->handle->name, pname, DAT__SZNAM );
}
/* Return the result. */
return result;
}