/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */


/*
 * Copyright (c) 1997, by Sun Microsystems, Inc.
 * All rights reserved.
 */

/*LINTLIBRARY*/

#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <pwd.h>
#include <stdlib.h>
#include <limits.h>
#include "libadm.h"

#define PROMPT  "Enter the login name of an existing user"
#define MESG    "Please enter the login name of an existing user."
#define ALTMESG "Please enter one of the following login names:\\n\\t"
#define MALSIZ  64

#define DELIM1 '/'
#define BLANK ' '

static char *
setmsg(int disp)
{
        struct passwd
                *pwdptr;
        int     count;
        size_t  n, m;
        char    *msg;

        if (disp == 0)
                return (MESG);

        m = MALSIZ;
        n = sizeof (ALTMESG);
        msg = (char *) calloc(m, sizeof (char));
        (void) strcpy(msg, ALTMESG);

        setpwent();
        count = 0;
        while (pwdptr = getpwent()) {
                n += strlen(pwdptr->pw_name) + 2;
                while (n >= m) {
                        m += MALSIZ;
                        msg = (char *) realloc(msg, m*sizeof (char));
                }
                if (count++)
                        (void) strcat(msg, ", ");
                (void) strcat(msg, pwdptr->pw_name);
        }
        endpwent();
        return (msg);
}

int
ckuid_dsp(void)
{
        struct passwd *pwdptr;

        /* if display flag is set, then list out passwd file */
        if (ckpwdfile() == 1)
                return (1);
        setpwent();
        while (pwdptr = getpwent())
                (void) printf("%s\n", pwdptr->pw_name);
        endpwent();
        return (0);
}

int
ckuid_val(char *usrnm)
{
        int     valid;

        setpwent();
        valid = (getpwnam(usrnm) ? 0 : 1);
        endpwent();
        return (valid);
}

int
ckpwdfile(void) /* check to see if passwd file there */
{
        struct passwd *pwdptr;

        setpwent();
        pwdptr = getpwent();
        if (!pwdptr) {
                endpwent();
                return (1);
        }
        endpwent();
        return (0);
}

void
ckuid_err(short disp, char *error)
{
        char    *msg;

        msg = setmsg(disp);
        puterror(stdout, msg, error);
        if (disp)
                free(msg);
}

void
ckuid_hlp(int disp, char *help)
{
        char    *msg;

        msg = setmsg(disp);
        puthelp(stdout, msg, help);
        if (disp)
                free(msg);
}

int
ckuid(char *uid, short disp, char *defstr, char *error, char *help,
        char *prompt)
{
        char    *defmesg,
                input[MAX_INPUT];

        defmesg = NULL;
        if (!prompt)
                prompt = PROMPT;

start:
        putprmpt(stderr, prompt, NULL, defstr);
        if (getinput(input)) {
                if (disp && defmesg)
                        free(defmesg);
                return (1);
        }

        if (!strlen(input)) {
                if (defstr) {
                        if (disp && defmesg)
                                free(defmesg);
                        (void) strcpy(uid, defstr);
                        return (0);
                }
                if (!defmesg)
                        defmesg = setmsg(disp);
                puterror(stderr, defmesg, error);
                goto start;
        } else if (strcmp(input, "?") == 0) {
                if (!defmesg)
                        defmesg = setmsg(disp);
                puthelp(stderr, defmesg, help);
                goto start;
        } else if (ckquit && (strcmp(input, "q") == 0)) {
                if (disp && defmesg)
                        free(defmesg);
                return (3);
        } else if (ckuid_val(input)) {
                if (!defmesg)
                        defmesg = setmsg(disp);
                puterror(stderr, defmesg, error);
                goto start;
        }
        (void) strcpy(uid, input);
        if (disp && defmesg)
                free(defmesg);
        return (0);
}