Geografic-Information-System/lib/btree/try.c

/****************************************************************************
 *
 * MODULE:       btree
 * AUTHOR(S):    CERL (present in ver 4.x)
 *               Radim Blazek <radim.blazek gmail.com>
 *               Glynn Clements <glynn gclements.plus.com>
 * PURPOSE:      balanced tree - possibly duplicating libavl functionality; see
 *               http://grass.itc.it/pipermail/grass-dev/2007-April/030396.html
 * COPYRIGHT:    (C) 2002-2007 by the GRASS Development Team
 *
 *               This program is free software under the GNU General Public
 *               License (>=v2). Read the file COPYING that comes with GRASS
 *               for details.
 *
 *****************************************************************************/
#include <stdio.h>
#include <string.h>
#include <grass/btree.h>

static int cmp(const void *a, const void *b)
{
    return strcmp(a, b);
}

int main (void)
{
    char key[100], data[100];
    void *k, *d;
    BTREE B;

    btree_create (&B, strcmp, 10);
    while (1)
    {
	fprintf (stdout,"enter key (or RETURN if done): ");
	if (!gets(key)) exit(0);
	if (*key == 0) break;
	fprintf (stdout,"    ");
	if (btree_find (&B,key,&d))
	    fprintf (stdout,"%s = %s\n", key, d);
	else
	    fprintf (stdout,"%s - not found\n", key);
	fprintf (stdout,"    ");
	fprintf (stdout,"enter new value (or RETURN if none): ");
	if (!gets(data)) exit(0);
	if (*data)
	    btree_update (&B, key, strlen(key)+1, data, strlen(data)+1);
    }

    fprintf (stdout,"final tree\n");
    btree_rewind (&B);
    while (btree_next (&B, &k, &d))
	fprintf (stdout,"%s:%s\n", (const char *) k, (const char *) d);

    return 0;
}