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6c6c970d KB |
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) |
c5980113 | 9 | static char sccsid[] = "@(#)getgrent.c 5.8 (Berkeley) %G%"; |
6c6c970d | 10 | #endif /* LIBC_SCCS and not lint */ |
bb22887e | 11 | |
6c6c970d | 12 | #include <sys/types.h> |
41746c4f | 13 | #include <stdio.h> |
c5980113 | 14 | #include <stdlib.h> |
41746c4f BJ |
15 | #include <grp.h> |
16 | ||
6c6c970d KB |
17 | static FILE *_gr_fp; |
18 | static struct group _gr_group; | |
19 | static int _gr_stayopen; | |
c5980113 DS |
20 | static const char *_gr_file = _PATH_GROUP; |
21 | static start_gr(); | |
22 | static grscan(); | |
41746c4f | 23 | |
6c6c970d KB |
24 | #define MAXGRP 200 |
25 | static char *members[MAXGRP]; | |
26 | #define MAXLINELENGTH 1024 | |
27 | static char line[MAXLINELENGTH]; | |
41746c4f | 28 | |
6c6c970d KB |
29 | struct group * |
30 | getgrent() | |
41746c4f | 31 | { |
6c6c970d KB |
32 | if (!_gr_fp && !start_gr() || !grscan(0, 0, (char *)NULL)) |
33 | return((struct group *)NULL); | |
34 | return(&_gr_group); | |
41746c4f BJ |
35 | } |
36 | ||
6c6c970d KB |
37 | struct group * |
38 | getgrnam(name) | |
c5980113 | 39 | const char *name; |
6c6c970d KB |
40 | { |
41 | int rval; | |
42 | ||
43 | if (!start_gr()) | |
44 | return((struct group *)NULL); | |
45 | rval = grscan(1, 0, name); | |
46 | if (!_gr_stayopen) | |
47 | endgrent(); | |
48 | return(rval ? &_gr_group : (struct group *)NULL); | |
49 | } | |
50 | ||
51 | struct group * | |
c5980113 DS |
52 | #ifdef __STDC__ |
53 | getgrgid(gid_t gid) | |
54 | #else | |
6c6c970d | 55 | getgrgid(gid) |
c5980113 DS |
56 | gid_t gid; |
57 | #endif | |
6c6c970d KB |
58 | { |
59 | int rval; | |
60 | ||
61 | if (!start_gr()) | |
62 | return((struct group *)NULL); | |
63 | rval = grscan(1, gid, (char *)NULL); | |
64 | if (!_gr_stayopen) | |
65 | endgrent(); | |
66 | return(rval ? &_gr_group : (struct group *)NULL); | |
67 | } | |
68 | ||
69 | static | |
70 | start_gr() | |
41746c4f | 71 | { |
6c6c970d KB |
72 | if (_gr_fp) { |
73 | rewind(_gr_fp); | |
74 | return(1); | |
41746c4f | 75 | } |
6c6c970d | 76 | return((_gr_fp = fopen(_gr_file, "r")) ? 1 : 0); |
41746c4f BJ |
77 | } |
78 | ||
c5980113 | 79 | int |
6c6c970d | 80 | setgrent() |
41746c4f | 81 | { |
6c6c970d | 82 | return(setgroupent(0)); |
41746c4f BJ |
83 | } |
84 | ||
c5980113 | 85 | int |
6c6c970d KB |
86 | setgroupent(stayopen) |
87 | int stayopen; | |
88 | { | |
89 | if (!start_gr()) | |
90 | return(0); | |
91 | _gr_stayopen = stayopen; | |
92 | return(1); | |
93 | } | |
94 | ||
95 | void | |
96 | endgrent() | |
41746c4f | 97 | { |
6c6c970d KB |
98 | if (_gr_fp) { |
99 | (void)fclose(_gr_fp); | |
100 | _gr_fp = (FILE *)NULL; | |
41746c4f | 101 | } |
41746c4f | 102 | } |
5a029ac1 | 103 | |
6c6c970d | 104 | void |
5a029ac1 | 105 | setgrfile(file) |
c5980113 | 106 | const char *file; |
5a029ac1 | 107 | { |
6c6c970d KB |
108 | _gr_file = file; |
109 | } | |
110 | ||
111 | static | |
112 | grscan(search, gid, name) | |
113 | register int search, gid; | |
114 | register char *name; | |
115 | { | |
116 | register char *cp, **m; | |
0f38f0b7 | 117 | char *bp; |
6c6c970d KB |
118 | char *fgets(), *strsep(), *index(); |
119 | ||
120 | for (;;) { | |
121 | if (!fgets(line, sizeof(line), _gr_fp)) | |
122 | return(0); | |
0f38f0b7 | 123 | bp = line; |
6c6c970d KB |
124 | /* skip lines that are too big */ |
125 | if (!index(line, '\n')) { | |
126 | int ch; | |
127 | ||
128 | while ((ch = getc(_gr_fp)) != '\n' && ch != EOF) | |
129 | ; | |
130 | continue; | |
131 | } | |
0f38f0b7 | 132 | _gr_group.gr_name = strsep(&bp, ":\n"); |
6c6c970d KB |
133 | if (search && name && strcmp(_gr_group.gr_name, name)) |
134 | continue; | |
0f38f0b7 MT |
135 | _gr_group.gr_passwd = strsep(&bp, ":\n"); |
136 | if (!(cp = strsep(&bp, ":\n"))) | |
6c6c970d KB |
137 | continue; |
138 | _gr_group.gr_gid = atoi(cp); | |
7d9b2097 | 139 | if (search && name == NULL && _gr_group.gr_gid != gid) |
6c6c970d KB |
140 | continue; |
141 | for (m = _gr_group.gr_mem = members;; ++m) { | |
142 | if (m == &members[MAXGRP - 1]) { | |
143 | *m = NULL; | |
144 | break; | |
145 | } | |
0f38f0b7 | 146 | if ((*m = strsep(&bp, ", \n")) == NULL) |
6c6c970d KB |
147 | break; |
148 | } | |
149 | return(1); | |
150 | } | |
151 | /* NOTREACHED */ | |
5a029ac1 | 152 | } |