/*
 *	$Source: /afs/sipb.mit.edu/project/sipb-athena/repository/src/moira/lib/mr_query.c,v $
 *	$Author: ghudson $
 *	$Header: /afs/sipb.mit.edu/project/sipb-athena/repository/src/moira/lib/mr_query.c,v 1.9 1996/06/02 07:44:28 ghudson Exp $
 *
 *	Copyright (C) 1987 by the Massachusetts Institute of Technology
 *	For copying and distribution information, please see the file
 *	<mit-copyright.h>.
 * 
 */

#ifndef lint
static char *rcsid_sms_query_c = "$Header: /afs/sipb.mit.edu/project/sipb-athena/repository/src/moira/lib/mr_query.c,v 1.9 1996/06/02 07:44:28 ghudson Exp $";
#endif lint

#include <mit-copyright.h>
#include "mr_private.h"
#include <string.h>

/*
 * This routine is the primary external interface to the mr library.
 *
 * It builds a new argument vector with the query handle prepended,
 * and calls mr_query_internal.
 */
int level = 0;

int mr_query(name, argc, argv, callproc, callarg)
    char *name;		/* Query name */
    int argc;		/* Arg count */
    char **argv;		/* Args */
    int (*callproc)();	/* Callback procedure */
    char *callarg;		/* Callback argument */
{
    register char **nargv = (char **)malloc(sizeof(char *) * (argc+1));
    register int status = 0;
    nargv[0] = name;
    memcpy((char *)(nargv+1), (char *)argv, sizeof(char *) * argc);
    status = mr_query_internal(argc+1, nargv, callproc, callarg);
    free(nargv);
    return status;
}
/*
 * This routine makes an MR query.
 *
 * argv[0] is the query name.
 * argv[1..argc-1] are the query arguments.
 *
 * callproc is called once for each returned value, with arguments
 * argc, argv, and callarg.
 * If it returns a non-zero value, further calls to it are not done, and
 * all future data from the server is ignored (there should be some
 * way to send it a quench..)
 */

int mr_query_internal(argc, argv, callproc, callarg)
    int argc;		/* Arg count */
    char **argv;		/* Args */
    int (*callproc)();	/* Callback procedure */
    char *callarg;		/* Callback argument */
{
    int status;
    mr_params params_st;
    register mr_params *params = NULL;
    mr_params *reply = NULL;
    int stopcallbacks = 0;

    if (level) return MR_QUERY_NOT_REENTRANT;
    
    CHECK_CONNECTED;
    level++;

    params = &params_st; 
    params->mr_version_no = sending_version_no;
    params->mr_procno = MR_QUERY;
    params->mr_argc = argc;
    params->mr_argl = NULL;
    params->mr_argv = argv;
	
    if ((status = mr_do_call(params, &reply)))
	goto punt;

    while ((status = reply->mr_status) == MR_MORE_DATA) {
	if (!stopcallbacks) 
	    stopcallbacks =
		(*callproc)(reply->mr_argc, reply->mr_argv, callarg);
	mr_destroy_reply(reply);
	reply = NULL;

	initialize_operation(_mr_recv_op, mr_start_recv, &reply,
			     (int (*)())NULL);
	queue_operation(_mr_conn, CON_INPUT, _mr_recv_op);

	mr_complete_operation(_mr_recv_op);
	if (OP_STATUS(_mr_recv_op) != OP_COMPLETE) {
	    mr_disconnect();
	    status = MR_ABORTED;
	    goto punt_1;
	}
    }	
punt:
    mr_destroy_reply(reply);
punt_1:
    level--;
    return status;
}