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1 | /* |
2 | * Copyright (c) 1989 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
269a7923 | 5 | * %sccs.include.redist.c% |
6c6c970d KB |
6 | */ |
7 | ||
2ce81398 | 8 | #if defined(LIBC_SCCS) && !defined(lint) |
7d9b2097 | 9 | static char sccsid[] = "@(#)getgrent.c 5.7 (Berkeley) %G%"; |
6c6c970d | 10 | #endif /* LIBC_SCCS and not lint */ |
bb22887e | 11 | |
6c6c970d | 12 | #include <sys/types.h> |
41746c4f BJ |
13 | #include <stdio.h> |
14 | #include <grp.h> | |
15 | ||
6c6c970d KB |
16 | static FILE *_gr_fp; |
17 | static struct group _gr_group; | |
18 | static int _gr_stayopen; | |
19 | static char *_gr_file = _PATH_GROUP; | |
41746c4f | 20 | |
6c6c970d KB |
21 | #define MAXGRP 200 |
22 | static char *members[MAXGRP]; | |
23 | #define MAXLINELENGTH 1024 | |
24 | static char line[MAXLINELENGTH]; | |
41746c4f | 25 | |
6c6c970d KB |
26 | struct group * |
27 | getgrent() | |
41746c4f | 28 | { |
6c6c970d KB |
29 | if (!_gr_fp && !start_gr() || !grscan(0, 0, (char *)NULL)) |
30 | return((struct group *)NULL); | |
31 | return(&_gr_group); | |
41746c4f BJ |
32 | } |
33 | ||
6c6c970d KB |
34 | struct group * |
35 | getgrnam(name) | |
36 | char *name; | |
37 | { | |
38 | int rval; | |
39 | ||
40 | if (!start_gr()) | |
41 | return((struct group *)NULL); | |
42 | rval = grscan(1, 0, name); | |
43 | if (!_gr_stayopen) | |
44 | endgrent(); | |
45 | return(rval ? &_gr_group : (struct group *)NULL); | |
46 | } | |
47 | ||
48 | struct group * | |
49 | getgrgid(gid) | |
50 | int gid; | |
51 | { | |
52 | int rval; | |
53 | ||
54 | if (!start_gr()) | |
55 | return((struct group *)NULL); | |
56 | rval = grscan(1, gid, (char *)NULL); | |
57 | if (!_gr_stayopen) | |
58 | endgrent(); | |
59 | return(rval ? &_gr_group : (struct group *)NULL); | |
60 | } | |
61 | ||
62 | static | |
63 | start_gr() | |
41746c4f | 64 | { |
6c6c970d KB |
65 | if (_gr_fp) { |
66 | rewind(_gr_fp); | |
67 | return(1); | |
41746c4f | 68 | } |
6c6c970d | 69 | return((_gr_fp = fopen(_gr_file, "r")) ? 1 : 0); |
41746c4f BJ |
70 | } |
71 | ||
6c6c970d | 72 | setgrent() |
41746c4f | 73 | { |
6c6c970d | 74 | return(setgroupent(0)); |
41746c4f BJ |
75 | } |
76 | ||
6c6c970d KB |
77 | setgroupent(stayopen) |
78 | int stayopen; | |
79 | { | |
80 | if (!start_gr()) | |
81 | return(0); | |
82 | _gr_stayopen = stayopen; | |
83 | return(1); | |
84 | } | |
85 | ||
86 | void | |
87 | endgrent() | |
41746c4f | 88 | { |
6c6c970d KB |
89 | if (_gr_fp) { |
90 | (void)fclose(_gr_fp); | |
91 | _gr_fp = (FILE *)NULL; | |
41746c4f | 92 | } |
41746c4f | 93 | } |
5a029ac1 | 94 | |
6c6c970d | 95 | void |
5a029ac1 KB |
96 | setgrfile(file) |
97 | char *file; | |
98 | { | |
6c6c970d KB |
99 | _gr_file = file; |
100 | } | |
101 | ||
102 | static | |
103 | grscan(search, gid, name) | |
104 | register int search, gid; | |
105 | register char *name; | |
106 | { | |
107 | register char *cp, **m; | |
0f38f0b7 | 108 | char *bp; |
6c6c970d KB |
109 | char *fgets(), *strsep(), *index(); |
110 | ||
111 | for (;;) { | |
112 | if (!fgets(line, sizeof(line), _gr_fp)) | |
113 | return(0); | |
0f38f0b7 | 114 | bp = line; |
6c6c970d KB |
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 | } | |
0f38f0b7 | 123 | _gr_group.gr_name = strsep(&bp, ":\n"); |
6c6c970d KB |
124 | if (search && name && strcmp(_gr_group.gr_name, name)) |
125 | continue; | |
0f38f0b7 MT |
126 | _gr_group.gr_passwd = strsep(&bp, ":\n"); |
127 | if (!(cp = strsep(&bp, ":\n"))) | |
6c6c970d KB |
128 | continue; |
129 | _gr_group.gr_gid = atoi(cp); | |
7d9b2097 | 130 | if (search && name == NULL && _gr_group.gr_gid != gid) |
6c6c970d KB |
131 | continue; |
132 | for (m = _gr_group.gr_mem = members;; ++m) { | |
133 | if (m == &members[MAXGRP - 1]) { | |
134 | *m = NULL; | |
135 | break; | |
136 | } | |
0f38f0b7 | 137 | if ((*m = strsep(&bp, ", \n")) == NULL) |
6c6c970d KB |
138 | break; |
139 | } | |
140 | return(1); | |
141 | } | |
142 | /* NOTREACHED */ | |
5a029ac1 | 143 | } |