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[glibc/history.git] / grp / fgetgrent_r.c
blob8278a4516b2bda9f65b31885b941de7dd5e8f04f
1 /* Copyright (C) 1991, 1996-1999, 2000 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
19 #include <ctype.h>
20 #include <errno.h>
21 #include <grp.h>
22 #include <stdio.h>
24 #ifdef USE_IN_LIBIO
25 # include <libio/iolibio.h>
26 # define flockfile(s) _IO_flockfile (s)
27 # define funlockfile(s) _IO_funlockfile (s)
28 #endif
30 /* Define a line parsing function using the common code
31 used in the nss_files module. */
33 #define STRUCTURE group
34 #define ENTNAME grent
35 struct grent_data {};
37 #define TRAILING_LIST_MEMBER gr_mem
38 #define TRAILING_LIST_SEPARATOR_P(c) ((c) == ',')
39 #include <nss/nss_files/files-parse.c>
40 LINE_PARSER
42 STRING_FIELD (result->gr_name, ISCOLON, 0);
43 if (line[0] == '\0'
44 && (result->gr_name[0] == '+' || result->gr_name[0] == '-'))
46 result->gr_passwd = NULL;
47 result->gr_gid = 0;
49 else
51 STRING_FIELD (result->gr_passwd, ISCOLON, 0);
52 if (result->gr_name[0] == '+' || result->gr_name[0] == '-')
53 INT_FIELD_MAYBE_NULL (result->gr_gid, ISCOLON, 0, 10, , 0)
54 else
55 INT_FIELD (result->gr_gid, ISCOLON, 0, 10,)
60 /* Read one entry from the given stream. */
61 int
62 __fgetgrent_r (FILE *stream, struct group *resbuf, char *buffer, size_t buflen,
63 struct group **result)
65 char *p;
66 int parse_result;
68 flockfile (stream);
71 buffer[buflen - 1] = '\xff';
72 p = fgets_unlocked (buffer, buflen, stream);
73 if (__builtin_expect (p == NULL, 0) && feof_unlocked (stream))
75 funlockfile (stream);
76 *result = NULL;
77 __set_errno (ENOENT);
78 return errno;
80 if (__builtin_expect (p == NULL, 0) || buffer[buflen - 1] != '\xff')
82 funlockfile (stream);
83 *result = NULL;
84 __set_errno (ERANGE);
85 return errno;
88 /* Skip leading blanks. */
89 while (isspace (*p))
90 ++p;
91 } while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */
92 /* Parse the line. If it is invalid, loop to
93 get the next line of the file to parse. */
94 || ! (parse_result = parse_line (p, resbuf,
95 (void *) buffer, buflen,
96 &errno)));
98 funlockfile (stream);
100 if (__builtin_expect (parse_result, 0) == -1)
102 /* The parser ran out of space. */
103 *result = NULL;
104 return errno;
107 *result = resbuf;
108 return 0;
110 weak_alias (__fgetgrent_r, fgetgrent_r)