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 /*
32 * logdir()
33 *
34 * This routine does not use the getpwent(3) library routine
35 * because the latter uses the stdio package. The allocation of
36 * storage in this package destroys the integrity of the shell's
37 * storage allocation.
38 */
39
40 #include <fcntl.h> /* O_RDONLY */
41 #include <stdlib.h>
42 #include <unistd.h>
43 #include <string.h>
44
45 #define BUFSIZ 160
46
47 static char line[BUFSIZ+1];
48
49 static char *
passwdfield(char * p)50 passwdfield(char *p)
51 {
52 while (*p && *p != ':')
53 ++p;
54 if (*p)
55 *p++ = 0;
56 return (p);
57 }
58
59 char *
logdir(char * name)60 logdir(char *name)
61 {
62 char *p;
63 int i, j;
64 int pwf;
65
66 /* attempt to open the password file */
67 if ((pwf = open("/etc/passwd", O_RDONLY)) == -1)
68 return (0);
69
70 /* find the matching password entry */
71 do {
72 /* get the next line in the password file */
73 i = read(pwf, line, BUFSIZ);
74 for (j = 0; j < i; j++)
75 if (line[j] == '\n')
76 break;
77 /* return a null pointer if the whole file has been read */
78 if (j >= i)
79 return (0);
80 line[++j] = 0; /* terminate the line */
81 /* point at the next line */
82 (void) lseek(pwf, (long)(j - i), 1);
83 p = passwdfield(line); /* get the logname */
84 } while (*name != *line || /* fast pretest */
85 strcmp(name, line) != 0);
86 (void) close(pwf);
87
88 /* skip the intervening fields */
89 p = passwdfield(p);
90 p = passwdfield(p);
91 p = passwdfield(p);
92 p = passwdfield(p);
93
94 /* return the login directory */
95 (void) passwdfield(p);
96 return (p);
97 }
98