1/* Copyright (C) 1991-2019 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
32struct 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>
37LINE_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. */
58int
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}
107weak_alias (__fgetgrent_r, fgetgrent_r)
108