/* ********************************************************************** *\
 *         Copyright IBM Corporation 1988,1991 - All Rights Reserved      *
 *        For full copyright information see:'andrew/config/COPYRITE'     *
\* ********************************************************************** */

/*
	$Disclaimer: 
 * Permission to use, copy, modify, and distribute this software and its 
 * documentation for any purpose is hereby granted without fee, 
 * provided that the above copyright notice appear in all copies and that 
 * both that copyright notice, this permission notice, and the following 
 * disclaimer appear in supporting documentation, and that the names of 
 * IBM, Carnegie Mellon University, and other copyright holders, not be 
 * used in advertising or publicity pertaining to distribution of the software 
 * without specific, written prior permission.
 * 
 * IBM, CARNEGIE MELLON UNIVERSITY, AND THE OTHER COPYRIGHT HOLDERS 
 * DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING 
 * ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT 
 * SHALL IBM, CARNEGIE MELLON UNIVERSITY, OR ANY OTHER COPYRIGHT HOLDER 
 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY 
 * DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, 
 * WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
 * OF THIS SOFTWARE.
 *  $
*/

#ifndef NORCSID
#define NORCSID
static char rcsid[]="$Header: /afs/cs.cmu.edu/project/atk-dist/auis-6.3/overhead/eli/lib/RCS/strtab.c,v 2.6 1992/12/15 21:02:39 rr2b R6tape $";
#endif

#include  <strtab.h>

/*
 * Functions to handle manipulation of the global string table 
 */

/*
 * This function checks to see if the string is in the table.  If so, its
 * node is returned.  If not, a new one is created, placed in the table, and
 * returned. 
 */

EliStr_t       *eliStringTable_FindOrMake(st, strtab, string)
EliState_t     *st;
eliHashTable_t *strtab;
char           *string;
{
    EliStr_t       *tmp;

    if (!(tmp = eliStringTable_Find(strtab, string))) {
	tmp = eliStringTable_Make(st, strtab, string);
	if (EliErr_ErrP(st))
	    return (NULL);
    }
    return (tmp);
}


/*
 * Like eliStringTable_FindOrMake, but always creates a new node. 
 */

EliStr_t       *eliStringTable_Make(st, strtab, string)
EliState_t     *st;
eliHashTable_t *strtab;
char           *string;
{
    EliStr_t       *tmp;

    if (!(tmp = eliStr_GetNew_trace(st, EliTraceStk(st), string)))
	return (NULL);		/* Observe that this test is completely
				 * unnecessary */
    return (tmp);
}


/*
 * Find the strnode whose name is name, in the global table WARNING: Assumes
 * all data in ht are strnodes! 
 */

EliStr_t       *eliStringTable_Find(strtab, name)
eliHashTable_t *strtab;
char           *name;
{
    EliSexp_t      *tmp = eliHT_Find(strtab, name);

    return (tmp ? tmp->data.datum.strval : NULL);
}