1 /*
2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #if defined(LIBC_SCCS) && !defined(lint)
9 static char sccsid[] = "@(#)getgrent.c 8.2 (Berkeley) 03/21/94";
10 #endif /* LIBC_SCCS and not lint */
11
12 #include <sys/types.h>
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <grp.h>
16
17 static FILE *_gr_fp;
18 static struct group _gr_group;
19 static int _gr_stayopen;
20 static int grscan(), start_gr();
21
22 #define MAXGRP 200
23 static char *members[MAXGRP];
24 #define MAXLINELENGTH 1024
25 static char line[MAXLINELENGTH];
26
27 struct group *
getgrent()28 getgrent()
29 {
30 if (!_gr_fp && !start_gr() || !grscan(0, 0, NULL))
31 return(NULL);
32 return(&_gr_group);
33 }
34
35 struct group *
getgrnam(name)36 getgrnam(name)
37 const char *name;
38 {
39 int rval;
40
41 if (!start_gr())
42 return(NULL);
43 rval = grscan(1, 0, name);
44 if (!_gr_stayopen)
45 endgrent();
46 return(rval ? &_gr_group : NULL);
47 }
48
49 struct group *
50 #ifdef __STDC__
getgrgid(gid_t gid)51 getgrgid(gid_t gid)
52 #else
53 getgrgid(gid)
54 gid_t gid;
55 #endif
56 {
57 int rval;
58
59 if (!start_gr())
60 return(NULL);
61 rval = grscan(1, gid, NULL);
62 if (!_gr_stayopen)
63 endgrent();
64 return(rval ? &_gr_group : NULL);
65 }
66
67 static
start_gr()68 start_gr()
69 {
70 if (_gr_fp) {
71 rewind(_gr_fp);
72 return(1);
73 }
74 return((_gr_fp = fopen(_PATH_GROUP, "r")) ? 1 : 0);
75 }
76
77 int
setgrent()78 setgrent()
79 {
80 return(setgroupent(0));
81 }
82
83 int
setgroupent(stayopen)84 setgroupent(stayopen)
85 int stayopen;
86 {
87 if (!start_gr())
88 return(0);
89 _gr_stayopen = stayopen;
90 return(1);
91 }
92
93 void
endgrent()94 endgrent()
95 {
96 if (_gr_fp) {
97 (void)fclose(_gr_fp);
98 _gr_fp = NULL;
99 }
100 }
101
102 static
grscan(search,gid,name)103 grscan(search, gid, name)
104 register int search, gid;
105 register char *name;
106 {
107 register char *cp, **m;
108 char *bp;
109 char *fgets(), *strsep(), *index();
110
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 _gr_group.gr_name = strsep(&bp, ":\n");
124 if (search && name && strcmp(_gr_group.gr_name, name))
125 continue;
126 _gr_group.gr_passwd = strsep(&bp, ":\n");
127 if (!(cp = strsep(&bp, ":\n")))
128 continue;
129 _gr_group.gr_gid = atoi(cp);
130 if (search && name == NULL && _gr_group.gr_gid != gid)
131 continue;
132 cp = NULL;
133 for (m = _gr_group.gr_mem = members;; bp++) {
134 if (m == &members[MAXGRP - 1])
135 break;
136 if (*bp == ',') {
137 if (cp) {
138 *bp = '\0';
139 *m++ = cp;
140 cp = NULL;
141 }
142 } else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
143 if (cp) {
144 *bp = '\0';
145 *m++ = cp;
146 }
147 break;
148 } else if (cp == NULL)
149 cp = bp;
150 }
151 *m = NULL;
152 return(1);
153 }
154 /* NOTREACHED */
155 }
156