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Replace <sys/param.h> with <limits.h> and other less dirty headers where
possible.  Annotate <sys/param.h> lines with their current reasons.  Switch
to PATH_MAX, NGROUPS_MAX, HOST_NAME_MAX+1, LOGIN_NAME_MAX, etc.  Change
MIN() and MAX() to local definitions of MINIMUM() and MAXIMUM() where
sensible to avoid pulling in the pollution.  These are the files confirmed
through binary verification.
ok guenther, millert, doug (helped with the verification protocol)

/*	$OpenBSD: field.c,v 1.14 2015/01/16 06:40:06 deraadt Exp $	*/
/*	$NetBSD: field.c,v 1.3 1995/03/26 04:55:28 glass Exp $	*/

/*
 * Copyright (c) 1988, 1993, 1994
 *	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 <ctype.h>
#include <err.h>
#include <errno.h>
#include <grp.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>

#include "chpass.h"

/* ARGSUSED */
int
p_login(char *p, struct passwd *pw, ENTRY *ep)
{
	if (!*p) {
		warnx("empty login field");
		return (1);
	}
	if (*p == '-') {
		warnx("login names may not begin with a hyphen");
		return (1);
	}
	/* XXX - what about truncated names? */
	if (strcmp(pw->pw_name, p) != 0 && getpwnam(p) != NULL) {
		warnx("login %s already exists", p);
		return (1);
	}
	if (!(pw->pw_name = strdup(p))) {
		warnx("can't save entry");
		return (1);
	}
	if (strchr(p, '.'))
		warnx("\'.\' is dangerous in a login name");
	for (; *p; ++p)
		if (isupper((unsigned char)*p)) {
			warnx("upper-case letters are dangerous in a login name");
			break;
		}
	return (0);
}

/* ARGSUSED */
int
p_passwd(char *p, struct passwd *pw, ENTRY *ep)
{
	if (!*p)
		pw->pw_passwd = "";	/* "NOLOGIN"; */
	else if (!(pw->pw_passwd = strdup(p))) {
		warnx("can't save password entry");
		return (1);
	}

	return (0);
}

/* ARGSUSED */
int
p_uid(char *p, struct passwd *pw, ENTRY *ep)
{
	uid_t id;
	const char *errstr;

	if (!*p) {
		warnx("empty uid field");
		return (1);
	}
	id = (uid_t)strtonum(p, 0, UID_MAX, &errstr);
	if (errstr) {
		warnx("uid is %s", errstr);
		return (1);
	}
	pw->pw_uid = id;
	return (0);
}

/* ARGSUSED */
int
p_gid(char *p, struct passwd *pw, ENTRY *ep)
{
	struct group *gr;
	const char *errstr;
	gid_t id;

	if (!*p) {
		warnx("empty gid field");
		return (1);
	}
	if (!isdigit((unsigned char)*p)) {
		if (!(gr = getgrnam(p))) {
			warnx("unknown group %s", p);
			return (1);
		}
		pw->pw_gid = gr->gr_gid;
		return (0);
	}
	id = (uid_t)strtonum(p, 0, GID_MAX, &errstr);
	if (errstr) {
		warnx("gid is %s", errstr);
		return (1);
	}
	pw->pw_gid = id;
	return (0);
}

/* ARGSUSED */
int
p_class(char *p, struct passwd *pw, ENTRY *ep)
{
	if (!*p)
		pw->pw_class = "";
	else if (!(pw->pw_class = strdup(p))) {
		warnx("can't save entry");
		return (1);
	}

	return (0);
}

/* ARGSUSED */
int
p_change(char *p, struct passwd *pw, ENTRY *ep)
{
	if (!atot(p, &pw->pw_change))
		return (0);
	warnx("illegal date for change field");
	return (1);
}

/* ARGSUSED */
int
p_expire(char *p, struct passwd *pw, ENTRY *ep)
{
	if (!atot(p, &pw->pw_expire))
		return (0);
	warnx("illegal date for expire field");
	return (1);
}

/* ARGSUSED */
int
p_gecos(char *p, struct passwd *pw, ENTRY *ep)
{
	if (!*p)
		ep->save = "";
	else if (!(ep->save = strdup(p))) {
		warnx("can't save entry");
		return (1);
	}
	return (0);
}

/* ARGSUSED */
int
p_hdir(char *p, struct passwd *pw, ENTRY *ep)
{
	if (!*p) {
		warnx("empty home directory field");
		return (1);
	}
	if (!(pw->pw_dir = strdup(p))) {
		warnx("can't save entry");
		return (1);
	}
	return (0);
}

/* ARGSUSED */
int
p_shell(char *p, struct passwd *pw, ENTRY *ep)
{
	char *t;

	if (!*p) {
		pw->pw_shell = _PATH_BSHELL;
		return (0);
	}
	/* only admin can change from or to "restricted" shells */
	if (uid && pw->pw_shell && !ok_shell(pw->pw_shell, NULL)) {
		warnx("%s: current shell non-standard", pw->pw_shell);
		return (1);
	}
	if (!ok_shell(p, &t)) {
		if (uid) {
			warnx("%s: non-standard shell", p);
			return (1);
		} else
			t = strdup(p);
	}
	if (!(pw->pw_shell = t)) {
		warnx("can't save entry");
		return (1);
	}
	return (0);
}