1 | /* Copyright (C) 1991-2017 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <ctype.h> |
19 | #include <errno.h> |
20 | #include <grp.h> |
21 | #include <stdio.h> |
22 | |
23 | #include <libio/iolibio.h> |
24 | #define flockfile(s) _IO_flockfile (s) |
25 | #define funlockfile(s) _IO_funlockfile (s) |
26 | |
27 | /* Define a line parsing function using the common code |
28 | used in the nss_files module. */ |
29 | |
30 | #define STRUCTURE group |
31 | #define ENTNAME grent |
32 | struct grent_data {}; |
33 | |
34 | #define TRAILING_LIST_MEMBER gr_mem |
35 | #define TRAILING_LIST_SEPARATOR_P(c) ((c) == ',') |
36 | #include <nss/nss_files/files-parse.c> |
37 | LINE_PARSER |
38 | (, |
39 | STRING_FIELD (result->gr_name, ISCOLON, 0); |
40 | if (line[0] == '\0' |
41 | && (result->gr_name[0] == '+' || result->gr_name[0] == '-')) |
42 | { |
43 | result->gr_passwd = NULL; |
44 | result->gr_gid = 0; |
45 | } |
46 | else |
47 | { |
48 | STRING_FIELD (result->gr_passwd, ISCOLON, 0); |
49 | if (result->gr_name[0] == '+' || result->gr_name[0] == '-') |
50 | INT_FIELD_MAYBE_NULL (result->gr_gid, ISCOLON, 0, 10, , 0) |
51 | else |
52 | INT_FIELD (result->gr_gid, ISCOLON, 0, 10,) |
53 | } |
54 | ) |
55 | |
56 | |
57 | /* Read one entry from the given stream. */ |
58 | int |
59 | __fgetgrent_r (FILE *stream, struct group *resbuf, char *buffer, size_t buflen, |
60 | struct group **result) |
61 | { |
62 | char *p; |
63 | int parse_result; |
64 | |
65 | flockfile (stream); |
66 | do |
67 | { |
68 | buffer[buflen - 1] = '\xff'; |
69 | p = fgets_unlocked (buffer, buflen, stream); |
70 | if (__builtin_expect (p == NULL, 0) && feof_unlocked (stream)) |
71 | { |
72 | funlockfile (stream); |
73 | *result = NULL; |
74 | __set_errno (ENOENT); |
75 | return errno; |
76 | } |
77 | if (__builtin_expect (p == NULL, 0) || buffer[buflen - 1] != '\xff') |
78 | { |
79 | funlockfile (stream); |
80 | *result = NULL; |
81 | __set_errno (ERANGE); |
82 | return errno; |
83 | } |
84 | |
85 | /* Skip leading blanks. */ |
86 | while (isspace (*p)) |
87 | ++p; |
88 | } while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */ |
89 | /* Parse the line. If it is invalid, loop to |
90 | get the next line of the file to parse. */ |
91 | || ! (parse_result = parse_line (p, resbuf, |
92 | (void *) buffer, buflen, |
93 | &errno))); |
94 | |
95 | funlockfile (stream); |
96 | |
97 | if (__builtin_expect (parse_result, 0) == -1) |
98 | { |
99 | /* The parser ran out of space. */ |
100 | *result = NULL; |
101 | return errno; |
102 | } |
103 | |
104 | *result = resbuf; |
105 | return 0; |
106 | } |
107 | weak_alias (__fgetgrent_r, fgetgrent_r) |
108 | |