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glibc/grp/fgetgrent_r.c
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/* Copyright (C) 1991-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <ctype.h> | |
#include <errno.h> | |
#include <grp.h> | |
#include <stdio.h> | |
#include <libio/iolibio.h> | |
#define flockfile(s) _IO_flockfile (s) | |
#define funlockfile(s) _IO_funlockfile (s) | |
/* Define a line parsing function using the common code | |
used in the nss_files module. */ | |
#define STRUCTURE group | |
#define ENTNAME grent | |
struct grent_data {}; | |
#define TRAILING_LIST_MEMBER gr_mem | |
#define TRAILING_LIST_SEPARATOR_P(c) ((c) == ',') | |
#include <nss/nss_files/files-parse.c> | |
LINE_PARSER | |
(, | |
STRING_FIELD (result->gr_name, ISCOLON, 0); | |
if (line[0] == '\0' | |
&& (result->gr_name[0] == '+' || result->gr_name[0] == '-')) | |
{ | |
result->gr_passwd = NULL; | |
result->gr_gid = 0; | |
} | |
else | |
{ | |
STRING_FIELD (result->gr_passwd, ISCOLON, 0); | |
if (result->gr_name[0] == '+' || result->gr_name[0] == '-') | |
INT_FIELD_MAYBE_NULL (result->gr_gid, ISCOLON, 0, 10, , 0) | |
else | |
INT_FIELD (result->gr_gid, ISCOLON, 0, 10,) | |
} | |
) | |
/* Read one entry from the given stream. */ | |
int | |
__fgetgrent_r (FILE *stream, struct group *resbuf, char *buffer, size_t buflen, | |
struct group **result) | |
{ | |
char *p; | |
int parse_result; | |
flockfile (stream); | |
do | |
{ | |
buffer[buflen - 1] = '\xff'; | |
p = fgets_unlocked (buffer, buflen, stream); | |
if (__builtin_expect (p == NULL, 0) && feof_unlocked (stream)) | |
{ | |
funlockfile (stream); | |
*result = NULL; | |
__set_errno (ENOENT); | |
return errno; | |
} | |
if (__builtin_expect (p == NULL, 0) || buffer[buflen - 1] != '\xff') | |
{ | |
funlockfile (stream); | |
*result = NULL; | |
__set_errno (ERANGE); | |
return errno; | |
} | |
/* Skip leading blanks. */ | |
while (isspace (*p)) | |
++p; | |
} while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */ | |
/* Parse the line. If it is invalid, loop to | |
get the next line of the file to parse. */ | |
|| ! (parse_result = parse_line (p, resbuf, | |
(void *) buffer, buflen, | |
&errno))); | |
funlockfile (stream); | |
if (__builtin_expect (parse_result, 0) == -1) | |
{ | |
/* The parser ran out of space. */ | |
*result = NULL; | |
return errno; | |
} | |
*result = resbuf; | |
return 0; | |
} | |
weak_alias (__fgetgrent_r, fgetgrent_r) |