/*      $NetBSD: getprotoent_r.c,v 1.8 2022/03/12 17:31:39 christos Exp $       */

/*
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)getprotoent.c       8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: getprotoent_r.c,v 1.8 2022/03/12 17:31:39 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

#include "namespace.h"
#include <netdb.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include "protoent.h"

#ifdef __weak_alias
__weak_alias(endprotoent_r,_endprotoent_r)
__weak_alias(getprotoent_r,_getprotoent_r)
__weak_alias(setprotoent_r,_setprotoent_r)
#endif

void
setprotoent_r(int f, struct protoent_data *pd)
{
        if (pd->fp == NULL)
                pd->fp = fopen(_PATH_PROTOCOLS, "re");
        else
                rewind(pd->fp);
        pd->stayopen |= f;
}

void
endprotoent_r(struct protoent_data *pd)
{
        if (pd->fp) {
                (void)fclose(pd->fp);
                pd->fp = NULL;
        }
        if (pd->aliases) {
                free(pd->aliases);
                pd->aliases = NULL;
                pd->maxaliases = 0;
        }
        if (pd->line) {
                free(pd->line);
                pd->line = NULL;
        }
        pd->stayopen = 0;
}

struct protoent *
getprotoent_r(struct protoent *pr, struct protoent_data *pd)
{
        char *p, *cp, **q;
        size_t i = 0;
        int serrno;

        if (pd->fp == NULL && (pd->fp = fopen(_PATH_PROTOCOLS, "re")) == NULL)
                return NULL;

        for (;;) {
                if (pd->line)
                        free(pd->line);
                pd->line = fparseln(pd->fp, NULL, NULL, NULL,
                    FPARSELN_UNESCALL);
                if (pd->line == NULL)
                        return NULL;
                pr->p_name = p = pd->line;
                cp = strpbrk(p, " \t");
                if (cp == NULL)
                        continue;
                *cp++ = '\0';
                while (*cp == ' ' || *cp == '\t')
                        cp++;
                p = strpbrk(cp, " \t");
                if (p != NULL)
                        *p++ = '\0';
                pr->p_proto = atoi(cp);
                if (pd->aliases == NULL) {
                        pd->aliases = NULL;
                        pd->maxaliases = 10;
                        errno = reallocarr(&pd->aliases,
                            pd->maxaliases, sizeof(*pd->aliases));
                        if (errno)
                                goto bad;
                }
                q = pr->p_aliases = pd->aliases;
                if (p != NULL) {
                        cp = p;
                        while (cp && *cp) {
                                if (*cp == ' ' || *cp == '\t') {
                                        cp++;
                                        continue;
                                }
                                if (i == pd->maxaliases - 2) {
                                        pd->maxaliases *= 2;
                                        errno = reallocarr(&q,
                                            pd->maxaliases, sizeof(*q));
                                        if (errno)
                                                goto bad;
                                        pr->p_aliases = pd->aliases = q;
                                }
                                q[i++] = cp;

                                cp = strpbrk(cp, " \t");
                                if (cp != NULL)
                                        *cp++ = '\0';
                        }
                }
                q[i] = NULL;
                return pr;
        }
bad:
        serrno = errno;
        endprotoent_r(pd);
        errno = serrno;
        return NULL;
}