getgrent.c revision 1.1.1.1 1 /* $NetBSD: getgrent.c,v 1.1.1.1 1995/10/08 23:08:48 gwr Exp $ */
2
3 /*
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 * Portions Copyright (c) 1994, Jason Downs. All Rights Reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37
38 #include <sys/types.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <grp.h>
43
44
45 static FILE *_gr_fp;
46 static struct group _gr_group;
47 static int _gr_stayopen;
48 static int grscan(), start_gr();
49
50 #define MAXGRP 200
51 static char *members[MAXGRP];
52 #define MAXLINELENGTH 1024
53 static char line[MAXLINELENGTH];
54
55
56 struct group *
57 getgrent()
58 {
59 if (!_gr_fp && !start_gr() || !grscan(0, 0, NULL))
60 return(NULL);
61 return(&_gr_group);
62 }
63
64 struct group *
65 getgrnam(name)
66 const char *name;
67 {
68 int rval;
69
70 if (!start_gr())
71 return(NULL);
72 rval = grscan(1, 0, name);
73 if (!_gr_stayopen)
74 endgrent();
75 return(rval ? &_gr_group : NULL);
76 }
77
78 struct group *
79 #ifdef __STDC__
80 getgrgid(gid_t gid)
81 #else
82 getgrgid(gid)
83 gid_t gid;
84 #endif
85 {
86 int rval;
87
88 if (!start_gr())
89 return(NULL);
90 rval = grscan(1, gid, NULL);
91 if (!_gr_stayopen)
92 endgrent();
93 return(rval ? &_gr_group : NULL);
94 }
95
96 static int
97 start_gr()
98 {
99 if (_gr_fp) {
100 rewind(_gr_fp);
101 return(1);
102 }
103 return((_gr_fp = fopen(_PATH_GROUP, "r")) ? 1 : 0);
104 }
105
106 void
107 setgrent()
108 {
109 (void) setgroupent(0);
110 }
111
112 int
113 setgroupent(stayopen)
114 int stayopen;
115 {
116 if (!start_gr())
117 return(0);
118 _gr_stayopen = stayopen;
119 return(1);
120 }
121
122 void
123 endgrent()
124 {
125 if (_gr_fp) {
126 (void)fclose(_gr_fp);
127 _gr_fp = NULL;
128 }
129 }
130
131 static int
132 grscan(search, gid, name)
133 register int search, gid;
134 register char *name;
135 {
136 register char *cp, **m;
137 char *bp;
138
139 for (;;) {
140 if (!fgets(line, sizeof(line), _gr_fp))
141 return(0);
142 bp = line;
143 /* skip lines that are too big */
144 if (!strchr(line, '\n')) {
145 int ch;
146
147 while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
148 ;
149 continue;
150 }
151 _gr_group.gr_name = strsep(&bp, ":\n");
152 if (search && name && strcmp(_gr_group.gr_name, name))
153 continue;
154 _gr_group.gr_passwd = strsep(&bp, ":\n");
155 if (!(cp = strsep(&bp, ":\n")))
156 continue;
157 _gr_group.gr_gid = atoi(cp);
158 if (search && name == NULL && _gr_group.gr_gid != gid)
159 continue;
160 cp = NULL;
161 if (bp == NULL)
162 continue;
163 for (m = _gr_group.gr_mem = members;; bp++) {
164 if (m == &members[MAXGRP - 1])
165 break;
166 if (*bp == ',') {
167 if (cp) {
168 *bp = '\0';
169 *m++ = cp;
170 cp = NULL;
171 }
172 } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
173 if (cp) {
174 *bp = '\0';
175 *m++ = cp;
176 }
177 break;
178 } else if (cp == NULL)
179 cp = bp;
180 }
181 *m = NULL;
182 return(1);
183 }
184 /* NOTREACHED */
185 }
186