xref: /titanic_52/usr/src/tools/cscope-fast/logdir.c (revision 7c478bd95313f5f23a4c958a745db2134aa03244)
1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate  * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate  *
4*7c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate  * with the License.
8*7c478bd9Sstevel@tonic-gate  *
9*7c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate  * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate  *
14*7c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate  *
20*7c478bd9Sstevel@tonic-gate  * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate  */
22*7c478bd9Sstevel@tonic-gate /*	Copyright (c) 1988 AT&T	*/
23*7c478bd9Sstevel@tonic-gate /*	  All Rights Reserved  	*/
24*7c478bd9Sstevel@tonic-gate 
25*7c478bd9Sstevel@tonic-gate 
26*7c478bd9Sstevel@tonic-gate /*
27*7c478bd9Sstevel@tonic-gate  * Copyright (c) 1999 by Sun Microsystems, Inc.
28*7c478bd9Sstevel@tonic-gate  * All rights reserved.
29*7c478bd9Sstevel@tonic-gate  */
30*7c478bd9Sstevel@tonic-gate 
31*7c478bd9Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
32*7c478bd9Sstevel@tonic-gate 
33*7c478bd9Sstevel@tonic-gate /*
34*7c478bd9Sstevel@tonic-gate  *	logdir()
35*7c478bd9Sstevel@tonic-gate  *
36*7c478bd9Sstevel@tonic-gate  *	This routine does not use the getpwent(3) library routine
37*7c478bd9Sstevel@tonic-gate  *	because the latter uses the stdio package.  The allocation of
38*7c478bd9Sstevel@tonic-gate  *	storage in this package destroys the integrity of the shell's
39*7c478bd9Sstevel@tonic-gate  *	storage allocation.
40*7c478bd9Sstevel@tonic-gate  */
41*7c478bd9Sstevel@tonic-gate 
42*7c478bd9Sstevel@tonic-gate #include <fcntl.h>	/* O_RDONLY */
43*7c478bd9Sstevel@tonic-gate #include <stdlib.h>
44*7c478bd9Sstevel@tonic-gate #include <unistd.h>
45*7c478bd9Sstevel@tonic-gate #include <string.h>
46*7c478bd9Sstevel@tonic-gate 
47*7c478bd9Sstevel@tonic-gate #define	BUFSIZ	160
48*7c478bd9Sstevel@tonic-gate 
49*7c478bd9Sstevel@tonic-gate static char line[BUFSIZ+1];
50*7c478bd9Sstevel@tonic-gate 
51*7c478bd9Sstevel@tonic-gate static char *
52*7c478bd9Sstevel@tonic-gate passwdfield(char *p)
53*7c478bd9Sstevel@tonic-gate {
54*7c478bd9Sstevel@tonic-gate 	while (*p && *p != ':')
55*7c478bd9Sstevel@tonic-gate 		++p;
56*7c478bd9Sstevel@tonic-gate 	if (*p)
57*7c478bd9Sstevel@tonic-gate 		*p++ = 0;
58*7c478bd9Sstevel@tonic-gate 	return (p);
59*7c478bd9Sstevel@tonic-gate }
60*7c478bd9Sstevel@tonic-gate 
61*7c478bd9Sstevel@tonic-gate char *
62*7c478bd9Sstevel@tonic-gate logdir(char *name)
63*7c478bd9Sstevel@tonic-gate {
64*7c478bd9Sstevel@tonic-gate 	char	*p;
65*7c478bd9Sstevel@tonic-gate 	int	i, j;
66*7c478bd9Sstevel@tonic-gate 	int	pwf;
67*7c478bd9Sstevel@tonic-gate 
68*7c478bd9Sstevel@tonic-gate 	/* attempt to open the password file */
69*7c478bd9Sstevel@tonic-gate 	if ((pwf = open("/etc/passwd", O_RDONLY)) == -1)
70*7c478bd9Sstevel@tonic-gate 		return (0);
71*7c478bd9Sstevel@tonic-gate 
72*7c478bd9Sstevel@tonic-gate 	/* find the matching password entry */
73*7c478bd9Sstevel@tonic-gate 	do {
74*7c478bd9Sstevel@tonic-gate 		/* get the next line in the password file */
75*7c478bd9Sstevel@tonic-gate 		i = read(pwf, line, BUFSIZ);
76*7c478bd9Sstevel@tonic-gate 		for (j = 0; j < i; j++)
77*7c478bd9Sstevel@tonic-gate 			if (line[j] == '\n')
78*7c478bd9Sstevel@tonic-gate 				break;
79*7c478bd9Sstevel@tonic-gate 		/* return a null pointer if the whole file has been read */
80*7c478bd9Sstevel@tonic-gate 		if (j >= i)
81*7c478bd9Sstevel@tonic-gate 			return (0);
82*7c478bd9Sstevel@tonic-gate 		line[++j] = 0;			/* terminate the line */
83*7c478bd9Sstevel@tonic-gate 		/* point at the next line */
84*7c478bd9Sstevel@tonic-gate 		(void) lseek(pwf, (long)(j - i), 1);
85*7c478bd9Sstevel@tonic-gate 		p = passwdfield(line);		/* get the logname */
86*7c478bd9Sstevel@tonic-gate 	} while (*name != *line ||	/* fast pretest */
87*7c478bd9Sstevel@tonic-gate 	    strcmp(name, line) != 0);
88*7c478bd9Sstevel@tonic-gate 	(void) close(pwf);
89*7c478bd9Sstevel@tonic-gate 
90*7c478bd9Sstevel@tonic-gate 	/* skip the intervening fields */
91*7c478bd9Sstevel@tonic-gate 	p = passwdfield(p);
92*7c478bd9Sstevel@tonic-gate 	p = passwdfield(p);
93*7c478bd9Sstevel@tonic-gate 	p = passwdfield(p);
94*7c478bd9Sstevel@tonic-gate 	p = passwdfield(p);
95*7c478bd9Sstevel@tonic-gate 
96*7c478bd9Sstevel@tonic-gate 	/* return the login directory */
97*7c478bd9Sstevel@tonic-gate 	(void) passwdfield(p);
98*7c478bd9Sstevel@tonic-gate 	return (p);
99*7c478bd9Sstevel@tonic-gate }
100