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#ifndef lint
static char *RCSid = "$Id: extlib.c,v 1.2 2001/01/25 22:16:44 mark Exp $";
#endif
/*
* The Regina Rexx Interpreter
* Copyright (C) 1993-1994 Anders Christensen <anders@pvv.unit.no>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "rexx.h"
struct extlib_funcbox {
struct extlib_funcbox *next, *prev ;
streng *name ;
int type ;
int hash1 ;
};
#define EXTFUNCS_COUNT (sizeof(((tsd_t *)0)->extfuncs) / \
sizeof(((tsd_t *)0)->extfuncs[0]))
static struct extlib_funcbox *findfunc( const tsd_t *TSD, const streng *name, int *hash,
int *hashbox )
{
struct extlib_funcbox *fptr=NULL ;
int lhashbox, lhash ;
*hash = lhash = hashvalue( name->value, name->len ) ;
*hashbox = lhashbox = lhash % EXTFUNCS_COUNT ;
for (fptr=TSD->extfuncs[lhashbox]; fptr; fptr=fptr->prev)
if (fptr->hash1 == lhash)
if (!Str_cmp(name, fptr->name))
return fptr ;
return NULL ;
}
int delfunc( tsd_t *TSD, const streng *name )
{
struct extlib_funcbox *old=NULL ;
int hash, hashbox ;
old = findfunc( TSD, name, &hash, &hashbox ) ;
if (!old)
return 1 ;
Free_stringTSD( old->name ) ;
if (old==TSD->extfuncs[hashbox])
TSD->extfuncs[hashbox] = old->prev ;
else
old->next->prev = old->prev ;
if (old->prev)
old->prev->next = old->next ;
FreeTSD( old ) ;
return 0 ;
}
/* addfunc returns 1 on success, 0 if already defined, -1 if memory is short.
* The argument name is used for further operation on success only.
*/
int addfunc( tsd_t *TSD, streng *name, int type )
{
struct extlib_funcbox *new=NULL ;
int hashbox, hash ;
if (findfunc( TSD, name, &hash, &hashbox ))
return 0 ;
new = MallocTSD( sizeof(struct extlib_funcbox )) ;
if (!new)
return -1 ;
new->name = name ;
new->type = type ;
new->next = NULL ;
new->hash1 = hash ;
new->prev = TSD->extfuncs[hashbox] ;
if (TSD->extfuncs[hashbox])
TSD->extfuncs[hashbox]->next = new ;
TSD->extfuncs[hashbox] = new ;
return 1 ;
}
int external_func( const tsd_t *TSD, const streng *name )
{
struct extlib_funcbox *ptr=NULL ;
int hash, hashbox ;
ptr = findfunc( TSD, name, &hash, &hashbox ) ;
if (ptr)
return 1 ;
else
return 0 ;
}
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