stc_findn.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 72 行

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date	97.09.21.19.29.17;	author dls;	state Dist;
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@/* stc_findn.c - stc_findnext, sntcpcmp */

#include <conf.h>
#include <kernel.h>
#include <network.h>

#ifdef	SNMP

/*------------------------------------------------------------------------
 * stc_findnext - search the TCP connection table for the next valid entry
 *------------------------------------------------------------------------
 */
int stc_findnext(tcbn)
int	tcbn;
{
	int	i, next;

	for (i = 0, next = -1; i < Ntcp; ++i) {
		if (tcbtab[i].tcb_state == TCPS_FREE ||
		   (tcbn >= 0 && sntcpcmp(i, tcbn) <= 0))
			continue;
		if (next < 0 || sntcpcmp(i, next) < 0)
			next = i;
	}
	return next;
}

/*------------------------------------------------------------------------
 * sntcpcmp - compare two TCP connections in SNMP lexical ordering
 *------------------------------------------------------------------------
 */
int sntcpcmp(tcb1, tcb2)
int	tcb1, tcb2;
{
	int	rv;

	if (rv=blkcmp(tcbtab[tcb1].tcb_lip,tcbtab[tcb2].tcb_lip,IP_ALEN))
		return rv;
	if (rv = (tcbtab[tcb1].tcb_lport - tcbtab[tcb2].tcb_lport))
		return rv;
	if (rv=blkcmp(tcbtab[tcb1].tcb_rip,tcbtab[tcb2].tcb_rip,IP_ALEN))
		return rv;
	if (rv = (tcbtab[tcb1].tcb_rport - tcbtab[tcb2].tcb_rport))
		return rv;
	return 0;
}
#endif	SNMP
@