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/*
* __getgrent.c - This file is part of the libc-8086/grp package for ELKS,
* Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <features.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#ifdef __UCLIBC_HAS_THREADS__
#include <pthread.h>
static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
# define LOCK pthread_mutex_lock(&mylock)
# define UNLOCK pthread_mutex_unlock(&mylock);
#else
# define LOCK
# define UNLOCK
#endif
/*
* This is the core group-file read function. It behaves exactly like
* getgrent() except that it is passed a file descriptor. getgrent()
* is just a wrapper for this function.
*/
struct group *__getgrent(int grp_fd, char *line_buff, char **members)
{
short line_index;
short buff_size;
static struct group group;
register char *ptr;
char *field_begin;
short member_num;
char *endptr;
int line_len;
/* We use the restart label to handle malformatted lines */
restart:
line_index = 0;
buff_size = 256;
line_buff = realloc(line_buff, buff_size);
while (1) {
if ((line_len = read(grp_fd, line_buff + line_index,
buff_size - line_index)) <= 0) {
return NULL;
}
field_begin = strchr(line_buff, '\n');
if (field_begin != NULL) {
lseek(grp_fd,
(long) (1 + field_begin -
(line_len + line_index + line_buff)), SEEK_CUR);
*field_begin = '\0';
if (*line_buff == '#' || *line_buff == ' '
|| *line_buff == '\n' || *line_buff == '\t')
goto restart;
break;
} else { /* Allocate some more space */
line_index = buff_size;
buff_size += 256;
line_buff = realloc(line_buff, buff_size);
}
}
/* Now parse the line */
group.gr_name = line_buff;
ptr = strchr(line_buff, ':');
if (ptr == NULL)
goto restart;
*ptr++ = '\0';
group.gr_passwd = ptr;
ptr = strchr(ptr, ':');
if (ptr == NULL)
goto restart;
*ptr++ = '\0';
field_begin = ptr;
ptr = strchr(ptr, ':');
if (ptr == NULL)
goto restart;
*ptr++ = '\0';
group.gr_gid = (gid_t) strtoul(field_begin, &endptr, 10);
if (*endptr != '\0')
goto restart;
member_num = 0;
field_begin = ptr;
if (members != NULL)
free(members);
members = (char **) malloc((member_num + 1) * sizeof(char *));
for ( ; field_begin && *field_begin != '\0'; field_begin = ptr) {
if ((ptr = strchr(field_begin, ',')) != NULL)
*ptr++ = '\0';
members[member_num++] = field_begin;
members = (char **) realloc(members,
(member_num + 1) * sizeof(char *));
}
members[member_num] = NULL;
group.gr_mem = members;
return &group;
}
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