/*
 * Time-stamp: <Sat Apr  5 09:10:53 CST 2003 aj>
 */

/* Copyright (C) 2003 Free Software Foundation, Inc.
 *
 * Chsh is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * Chsh is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
 * License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Chsh; see the file COPYING.  If not, write to the Free
 * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
 */

#include <stdio.h>
#include <string.h>		/* for strcmp() and strcpy() */
#include <sys/unistd.h>		/* for getuid() */
#include <pwd.h>		/* for pwent utils and structure */

char me[128];

/*
 * Look up the current user in the password database.
 */
char *
lookMeUp()
{
    struct passwd *currentPW;

    currentPW=getpwuid(getuid());
    strcpy(me, currentPW->pw_name);
    return(me);
}

/*
 * Dump the current entry in the same order as the structure.
 */
void
dumpPwEnt(struct passwd *currentPW, char *newShell)
{
    if(currentPW->pw_comment)
	printf("%s:%s:%d:%d:%s:%s:%s:%s\n",
	       currentPW->pw_name,
	       currentPW->pw_passwd,
	       currentPW->pw_uid,
	       currentPW->pw_gid,
	       currentPW->pw_comment,
	       currentPW->pw_gecos,
	       currentPW->pw_dir,
	       newShell ? newShell : currentPW->pw_shell);
    else
	printf("%s:%s:%d:%d:%s:%s:%s\n",
	       currentPW->pw_name,
	       currentPW->pw_passwd,
	       currentPW->pw_uid,
	       currentPW->pw_gid,
	       currentPW->pw_gecos,
	       currentPW->pw_dir,
	       newShell ? newShell : currentPW->pw_shell);
}

int
main(int argc, char *argv[])
{
    char *name;
    char *newShell;
    struct passwd *currentPW;

    switch(argc)
	{
	case 2:
	    name=lookMeUp();
	    newShell=argv[1];
	    break;
	case 3:
	    name=argv[1];
	    newShell=argv[2];
	    break;
	default:
	    fprintf(stderr,"usage: %s [name] /path/to/new/shell\n",argv[0]);
	    return(1);
	    break;
	}

    setpwent();
    currentPW=getpwent();
    do {
	if(!strcmp(currentPW->pw_name, name))
	    dumpPwEnt(currentPW,newShell);
	else
	    dumpPwEnt(currentPW,NULL);
	currentPW=getpwent();
    } while(currentPW && (currentPW->pw_uid >= 0) && (currentPW->pw_gid >= 0));
    endpwent();

    return(0);
}