mknetid(8): Raise WARNS to 6 and fix warnings (also -Wold-style-definition).
[dragonfly.git] / libexec / mknetid / parse_group.c
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1/*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
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32 *
33 * @(#)getgrent.c 8.2 (Berkeley) 3/21/94
34 * $FreeBSD: src/libexec/mknetid/parse_group.c,v 1.6 1999/08/28 00:09:42 peter Exp $
fc6d0222 35 * $DragonFly: src/libexec/mknetid/parse_group.c,v 1.3 2006/08/03 16:40:46 swildner Exp $
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36 */
37
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38/*
39 * This is a slightly modified chunk of getgrent(3). All the YP support
40 * and unneeded functions have been stripped out.
41 */
42
43#include <sys/types.h>
44#include <grp.h>
45#include <stdio.h>
46#include <stdlib.h>
47#include <string.h>
48
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49struct group *_getgrent(void);
50int _setgrent(void);
51void _endgrent(void);
984263bc 52FILE *_gr_fp;
06a0ed23 53
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54static struct group _gr_group;
55static int _gr_stayopen;
06a0ed23 56static int grscan(int, gid_t, char *), start_gr(void);
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57
58#define MAXGRP 200
59static char *members[MAXGRP];
60#define MAXLINELENGTH 1024
61static char line[MAXLINELENGTH];
62
63struct group *
06a0ed23 64_getgrent(void)
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65{
66 if (!_gr_fp && !start_gr()) {
67 return NULL;
68 }
69
70
71 if (!grscan(0, 0, NULL))
72 return(NULL);
73 return(&_gr_group);
74}
75
76static int
06a0ed23 77start_gr(void)
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78{
79 return 1;
80}
81
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82static int
83_setgroupent(int stayopen)
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84{
85 if (!start_gr())
86 return(0);
87 _gr_stayopen = stayopen;
88 return(1);
89}
90
91int
06a0ed23 92_setgrent(void)
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93{
94 return(_setgroupent(0));
95}
96
97void
06a0ed23 98_endgrent(void)
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99{
100 if (_gr_fp) {
101 (void)fclose(_gr_fp);
102 _gr_fp = NULL;
103 }
104}
105
106static int
06a0ed23 107grscan(int search, gid_t gid, char *name)
984263bc 108{
06a0ed23 109 char *cp, **m;
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110 char *bp;
111 for (;;) {
112 if (!fgets(line, sizeof(line), _gr_fp))
113 return(0);
114 bp = line;
115 /* skip lines that are too big */
116 if (!index(line, '\n')) {
117 int ch;
118
119 while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
120 ;
121 continue;
122 }
123 if ((_gr_group.gr_name = strsep(&bp, ":\n")) == NULL)
124 break;
125 if (_gr_group.gr_name[0] == '+')
126 continue;
127
128 if (search && name) {
129 if(strcmp(_gr_group.gr_name, name)) {
130 continue;
131 }
132 }
133 if ((_gr_group.gr_passwd = strsep(&bp, ":\n")) == NULL)
fc6d0222 134 break;
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135 if (!(cp = strsep(&bp, ":\n")))
136 continue;
137 _gr_group.gr_gid = atoi(cp);
138 if (search && name == NULL && _gr_group.gr_gid != gid)
139 continue;
140 cp = NULL;
141 if (bp == NULL) /* !! Must check for this! */
142 break;
143 for (m = _gr_group.gr_mem = members;; bp++) {
144 if (m == &members[MAXGRP - 1])
145 break;
146 if (*bp == ',') {
147 if (cp) {
148 *bp = '\0';
149 *m++ = cp;
150 cp = NULL;
151 }
152 } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
153 if (cp) {
154 *bp = '\0';
155 *m++ = cp;
156 }
157 break;
158 } else if (cp == NULL)
159 cp = bp;
160 }
161 *m = NULL;
162 return(1);
163 }
164 /* NOTREACHED */
165 return (0);
166}