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Christos Zoulas agreed to rescind clause 3 and 4 in
NetBSD fsck.8 rev 1.35 fsutil.h rev 1.14 pathnames.h rev 1.2
netgroup_mkdb.8 rev 1.9 netgroup_mkdb.c rev 1.18 str.c rev 1.7
str.h rev 1.4 rdate.8 rev 1.11 rdate.c rev 1.19 extern.h rev 1.14
getnetgrent.c rev 1.41 netgroup.h rev 1.10
fparseln.3 rev 1.4 fparseln.c rev 1.10

our stringlist.c/stringlist.h are derived from getnetgrent.c
rfc868time.c from rdate.c
newfs/pathnames.h from fsck/pathnames.h

https://mail-index.netbsd.org/source-changes/2009/10/21/msg002182.html
Not all files are covered as some had copyright assigned to TNF in 1998.

/*	$OpenBSD: stringlist.c,v 1.4 2023/01/04 13:00:11 jsg Exp $	*/

/*
 * Copyright (c) 1994 Christos Zoulas
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/types.h>
#include <stdio.h>
#include <netgroup.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "stringlist.h"

static const char _ngstar[] = "*";

static int		getstring(char **, int, char **);
static struct netgroup	*getnetgroup(char **);

/*
 * _ng_sl_init(): Initialize a string list
 */
struct stringlist *
_ng_sl_init(void)
{
	struct stringlist *sl = malloc(sizeof(struct stringlist));
	if (sl == NULL)
		return NULL;

	sl->sl_cur = 0;
	sl->sl_max = 20;
	sl->sl_str = calloc(sl->sl_max, sizeof(char *));
	if (sl->sl_str == NULL) {
		free(sl);
		return NULL;
	}
	return sl;
}


/*
 * _ng_sl_add(): Add an item to the string list
 */
int
_ng_sl_add(struct stringlist *sl, char *name)
{
	if (sl->sl_cur == sl->sl_max - 1) {
		char **slstr;

		sl->sl_max += 20;
		slstr = reallocarray(sl->sl_str, sl->sl_max, sizeof(char *));
		if (slstr == NULL) {
			free(sl->sl_str);
			sl->sl_str = NULL;
			return -1;
		}
		sl->sl_str = slstr;
	}
	sl->sl_str[sl->sl_cur++] = name;
	return 0;
}


/*
 * _ng_sl_free(): Free a stringlist
 */
void
_ng_sl_free(struct stringlist *sl, int all)
{
	size_t	i;

	if (all)
		for (i = 0; i < sl->sl_cur; i++)
			free(sl->sl_str[i]);
	free(sl->sl_str);
	free(sl);
}


/*
 * sl_find(): Find a name in the string list
 */
char *
_ng_sl_find(struct stringlist *sl, char *name)
{
	size_t	i;

	for (i = 0; i < sl->sl_cur; i++)
		if (strcmp(sl->sl_str[i], name) == 0)
			return sl->sl_str[i];

	return NULL;
}

/*
 * _ng_parse(): Parse a line and return: _NG_ERROR: Syntax Error _NG_NONE:
 * line was empty or a comment _NG_GROUP: line had a netgroup definition,
 * returned in ng _NG_NAME:  line had a netgroup name, returned in name
 *
 * Public since used by netgroup_mkdb
 */
int
_ng_parse(char **p, char **name, struct netgroup **ng)
{
	while (**p) {
		if (**p == '#')
			/* comment */
			return _NG_NONE;

		while (**p && _NG_ISSPACE(**p))
			/* skipblank */
			(*p)++;

		if (**p == '(') {
			if ((*ng = getnetgroup(p)) == NULL)
				return _NG_ERROR;
			return _NG_GROUP;
		} else {
			char	*np;
			int	i;

			for (np = *p; **p && !_NG_ISSPACE(**p); (*p)++)
				continue;
			if (np != *p) {
				i = (*p - np) + 1;
				*name = malloc(i);
				if (*name == NULL)
					return _NG_ERROR;
				memcpy(*name, np, i);
				(*name)[i - 1] = '\0';
				return _NG_NAME;
			}
		}
	}
	return _NG_NONE;
}

/*
 * _ng_makekey(): Make a key from the two names given. The key is of the form
 * <name1>.<name2> Names strings are replaced with * if they are empty;
 */
char *
_ng_makekey(const char *s1, const char *s2, size_t len)
{
	char *buf = malloc(len);
	int ret;

	if (buf == NULL)
		return NULL;
	ret = snprintf(buf, len, "%s.%s", _NG_STAR(s1), _NG_STAR(s2));
	if (ret < 0 || ret >= len) {
		free(buf);
		return NULL;
	}

	return buf;
}

void
_ng_print(char *buf, size_t len, const struct netgroup *ng)
{
	(void) snprintf(buf, len, "(%s,%s,%s)", _NG_EMPTY(ng->ng_host),
	    _NG_EMPTY(ng->ng_user), _NG_EMPTY(ng->ng_domain));
}

/*
 * getnetgroup(): Parse a netgroup, and advance the pointer
 */
static struct netgroup *
getnetgroup(char **pp)
{
	struct netgroup *ng = malloc(sizeof(struct netgroup));

	if (ng == NULL)
		return NULL;

	(*pp)++;	/* skip '(' */
	if (!getstring(pp, ',', &ng->ng_host))
		goto badhost;

	if (!getstring(pp, ',', &ng->ng_user))
		goto baduser;

	if (!getstring(pp, ')', &ng->ng_domain))
		goto baddomain;

#ifdef DEBUG_NG
	{
		char buf[1024];
		_ng_print(buf, sizeof(buf), ng);
		fprintf(stderr, "netgroup %s\n", buf);
	}
#endif
	return ng;

baddomain:
	free(ng->ng_user);
baduser:
	free(ng->ng_host);
badhost:
	free(ng);
	return NULL;
}

/*
 * getstring(): Get a string delimited by the character, skipping leading and
 * trailing blanks and advancing the pointer
 */
static int
getstring(char **pp, int del, char **str)
{
	char *sp, *ep, *dp;

	/* skip leading blanks */
	for (sp = *pp; *sp && _NG_ISSPACE(*sp); sp++)
		continue;

	/* accumulate till delimiter or space */
	for (ep = sp; *ep && *ep != del && !_NG_ISSPACE(*ep); ep++)
		continue;

	/* hunt for the delimiter */
	for (dp = ep; *dp && *dp != del && _NG_ISSPACE(*dp); dp++)
		continue;

	if (*dp != del) {
		*str = NULL;
		return 0;
	}

	*pp = ++dp;

	del = (ep - sp) + 1;
	if (del > 1) {
		dp = malloc(del);
		if (dp == NULL)
			return 0;
		memcpy(dp, sp, del);
		dp[del - 1] = '\0';
	} else
		dp = NULL;

	*str = dp;
	return 1;
}