179 lines
4.1 KiB
C
179 lines
4.1 KiB
C
/*
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* Copyright (c) 1996 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#if !defined(LINT) && !defined(CODECENTER)
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static char rcsid[] = "$Id: gen_nw.c,v 1.8 1997/12/04 04:57:50 halley Exp $";
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#endif
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/* Imports */
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#include "port_before.h"
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#include <sys/types.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <irs.h>
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#include "port_after.h"
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#include "irs_p.h"
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#include "gen_p.h"
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/* Types */
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struct pvt {
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struct irs_rule * rules;
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struct irs_rule * rule;
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};
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/* Forward */
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static void nw_close(struct irs_nw*);
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static struct nwent * nw_next(struct irs_nw *);
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static struct nwent * nw_byname(struct irs_nw *, const char *, int);
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static struct nwent * nw_byaddr(struct irs_nw *, void *, int, int);
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static void nw_rewind(struct irs_nw *);
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static void nw_minimize(struct irs_nw *);
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/* Public */
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struct irs_nw *
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irs_gen_nw(struct irs_acc *this) {
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struct gen_p *accpvt = (struct gen_p *)this->private;
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struct irs_nw *nw;
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struct pvt *pvt;
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if (!(nw = (struct irs_nw *)malloc(sizeof *nw))) {
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errno = ENOMEM;
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return (NULL);
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}
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memset(nw, 0x5e, sizeof *nw);
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if (!(pvt = (struct pvt *)malloc(sizeof *pvt))) {
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free(nw);
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errno = ENOMEM;
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return (NULL);
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}
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memset(pvt, 0, sizeof *pvt);
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pvt->rules = accpvt->map_rules[irs_nw];
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pvt->rule = pvt->rules;
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nw->private = pvt;
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nw->close = nw_close;
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nw->next = nw_next;
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nw->byname = nw_byname;
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nw->byaddr = nw_byaddr;
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nw->rewind = nw_rewind;
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nw->minimize = nw_minimize;
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return (nw);
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}
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/* Methods */
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static void
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nw_close(struct irs_nw *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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free(pvt);
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free(this);
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}
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static struct nwent *
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nw_next(struct irs_nw *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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struct nwent *rval;
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struct irs_nw *nw;
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while (pvt->rule) {
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nw = pvt->rule->inst->nw;
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rval = (*nw->next)(nw);
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if (rval)
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return (rval);
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if (!(pvt->rules->flags & IRS_CONTINUE))
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break;
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pvt->rule = pvt->rule->next;
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if (pvt->rule) {
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nw = pvt->rule->inst->nw;
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(*nw->rewind)(nw);
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}
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}
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return (NULL);
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}
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static struct nwent *
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nw_byname(struct irs_nw *this, const char *name, int type) {
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struct pvt *pvt = (struct pvt *)this->private;
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struct irs_rule *rule;
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struct nwent *rval;
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struct irs_nw *nw;
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for (rule = pvt->rules; rule; rule = rule->next) {
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nw = rule->inst->nw;
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h_errno = NETDB_INTERNAL;
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rval = (*nw->byname)(nw, name, type);
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if (rval != NULL)
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return (rval);
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if (h_errno != TRY_AGAIN && !(rule->flags & IRS_CONTINUE))
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break;
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}
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return (NULL);
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}
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static struct nwent *
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nw_byaddr(struct irs_nw *this, void *net, int length, int type) {
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struct pvt *pvt = (struct pvt *)this->private;
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struct irs_rule *rule;
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struct nwent *rval;
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struct irs_nw *nw;
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for (rule = pvt->rules; rule; rule = rule->next) {
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nw = rule->inst->nw;
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h_errno = NETDB_INTERNAL;
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rval = (*nw->byaddr)(nw, net, length, type);
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if (rval != NULL)
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return (rval);
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if (h_errno != TRY_AGAIN && !(rule->flags & IRS_CONTINUE))
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break;
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}
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return (NULL);
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}
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static void
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nw_rewind(struct irs_nw *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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struct irs_nw *nw;
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pvt->rule = pvt->rules;
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if (pvt->rule) {
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nw = pvt->rule->inst->nw;
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(*nw->rewind)(nw);
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}
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}
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static void
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nw_minimize(struct irs_nw *this) {
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struct pvt *pvt = (struct pvt *)this->private;
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struct irs_rule *rule;
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for (rule = pvt->rules; rule != NULL; rule = rule->next) {
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struct irs_nw *nw = rule->inst->nw;
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(*nw->minimize)(nw);
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}
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}
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