zifnotice.c

Linux下的多协议即时通讯程序源代码

/* This file is part of the Project Athena Zephyr Notification System.
 * It contains source for the ZIfNotice function.
 *
 *	Created by:	Robert French
 *
 *	Copyright (c) 1987,1988 by the Massachusetts Institute of Technology.
 *	For copying and distribution information, see the file
 *	"mit-copyright.h". 
 */

#include "internal.h"

Code_t ZIfNotice(notice, from, predicate, args)
    ZNotice_t *notice;
    struct sockaddr_in *from;
    int (*predicate) __P((ZNotice_t *, void *));
    void *args;
{
    ZNotice_t tmpnotice;
    Code_t retval;
    char *buffer;
    struct _Z_InputQ *qptr;

    if ((retval = Z_WaitForComplete()) != ZERR_NONE)
	return (retval);
	
    qptr = Z_GetFirstComplete();
    
    for (;;) {
	while (qptr) {
	    if ((retval = ZParseNotice(qptr->packet, qptr->packet_len, 
				       &tmpnotice)) != ZERR_NONE)
		return (retval);
	    if ((*predicate)(&tmpnotice, args)) {
		if (!(buffer = (char *) malloc((unsigned) qptr->packet_len)))
		    return (ENOMEM);
		(void) memcpy(buffer, qptr->packet, qptr->packet_len);
		if (from)
		    *from = qptr->from;
		if ((retval = ZParseNotice(buffer, qptr->packet_len, 
					   notice)) != ZERR_NONE) {
		    free(buffer);
		    return (retval);
		}
		Z_RemQueue(qptr);
		return (ZERR_NONE);
	    }
	    qptr = Z_GetNextComplete(qptr);
	}
	if ((retval = Z_ReadWait()) != ZERR_NONE)
	    return (retval);
	qptr = Z_GetFirstComplete();	/* need to look over all of
					   the queued messages, in case
					   a fragment has been reassembled */
    }
}