/**
 * $Id$
 *
 * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. The Blender
 * Foundation also sells licenses for use in proprietary software under
 * the Blender License.  See http://www.blender.org/BL/ for information
 * about this.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL/BL DUAL LICENSE BLOCK *****
 * Dynamically sized string ADT
 */

#include <stdlib.h>
#include <string.h>

#include "MEM_guardedalloc.h"

#include "BLI_blenlib.h"
#include "BLI_dynstr.h"

/***/

typedef struct DynStrElem DynStrElem;
struct DynStrElem {
	DynStrElem *next;
	
	char *str;
};

struct DynStr {
	DynStrElem *elems, *last;
	int curlen;
};

/***/

DynStr *BLI_dynstr_new(void) {
	DynStr *ds= MEM_mallocN(sizeof(*ds), "DynStr");
	ds->elems= ds->last= NULL;
	ds->curlen= 0;
	
	return ds;
}

void BLI_dynstr_append(DynStr *ds, char *cstr) {
	DynStrElem *dse= malloc(sizeof(*dse));
	int cstrlen= strlen(cstr);
	
	dse->str= malloc(cstrlen+1);
	memcpy(dse->str, cstr, cstrlen+1);
	dse->next= NULL;
	
	if (!ds->last)
		ds->last= ds->elems= dse;
	else
		ds->last= ds->last->next= dse;

	ds->curlen+= cstrlen;
}

int BLI_dynstr_get_len(DynStr *ds) {
	return ds->curlen;
}

char *BLI_dynstr_get_cstring(DynStr *ds) {
	char *s, *rets= MEM_mallocN(ds->curlen+1, "dynstr_cstring");
	DynStrElem *dse;
	
	for (s= rets, dse= ds->elems; dse; dse= dse->next) {
		int slen= strlen(dse->str);

		memcpy(s, dse->str, slen);

		s+= slen;
	}
	rets[ds->curlen]= '\0';
	
	return rets;
}

void BLI_dynstr_free(DynStr *ds) {
	DynStrElem *dse;
	
	for (dse= ds->elems; dse; ) {
		DynStrElem *n= dse->next;
		
		free(dse->str);
		free(dse);
		
		dse= n;
	}
	
	MEM_freeN(ds);
}