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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*	Copyright (c) 1988 AT&T	*/
     23 /*	  All Rights Reserved  	*/
     24 
     25 
     26 /*
     27  * Copyright (c) 1999 by Sun Microsystems, Inc.
     28  * All rights reserved.
     29  */
     30 
     31 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     32 
     33 /*
     34  *	logdir()
     35  *
     36  *	This routine does not use the getpwent(3) library routine
     37  *	because the latter uses the stdio package.  The allocation of
     38  *	storage in this package destroys the integrity of the shell's
     39  *	storage allocation.
     40  */
     41 
     42 #include <fcntl.h>	/* O_RDONLY */
     43 #include <stdlib.h>
     44 #include <unistd.h>
     45 #include <string.h>
     46 
     47 #define	BUFSIZ	160
     48 
     49 static char line[BUFSIZ+1];
     50 
     51 static char *
     52 passwdfield(char *p)
     53 {
     54 	while (*p && *p != ':')
     55 		++p;
     56 	if (*p)
     57 		*p++ = 0;
     58 	return (p);
     59 }
     60 
     61 char *
     62 logdir(char *name)
     63 {
     64 	char	*p;
     65 	int	i, j;
     66 	int	pwf;
     67 
     68 	/* attempt to open the password file */
     69 	if ((pwf = open("/etc/passwd", O_RDONLY)) == -1)
     70 		return (0);
     71 
     72 	/* find the matching password entry */
     73 	do {
     74 		/* get the next line in the password file */
     75 		i = read(pwf, line, BUFSIZ);
     76 		for (j = 0; j < i; j++)
     77 			if (line[j] == '\n')
     78 				break;
     79 		/* return a null pointer if the whole file has been read */
     80 		if (j >= i)
     81 			return (0);
     82 		line[++j] = 0;			/* terminate the line */
     83 		/* point at the next line */
     84 		(void) lseek(pwf, (long)(j - i), 1);
     85 		p = passwdfield(line);		/* get the logname */
     86 	} while (*name != *line ||	/* fast pretest */
     87 	    strcmp(name, line) != 0);
     88 	(void) close(pwf);
     89 
     90 	/* skip the intervening fields */
     91 	p = passwdfield(p);
     92 	p = passwdfield(p);
     93 	p = passwdfield(p);
     94 	p = passwdfield(p);
     95 
     96 	/* return the login directory */
     97 	(void) passwdfield(p);
     98 	return (p);
     99 }
    100