uclibc-ng/libc/pwd_grp/fgetpwent.c

/*
 * fgetpwent.c - This file is part of the libc-8086/pwd 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 <errno.h>
#include <stdio.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

int fgetpwent_r (FILE *file, struct passwd *password,
	char *buff, size_t buflen, struct passwd **result)
{
    int res;
    if (file == NULL) {
	return EINTR;
    }
    *result = NULL;
    res = __getpwent_r(password, buff, buflen, fileno(file));
    *result = password;
    return res;
}

struct passwd *fgetpwent(FILE * file)
{
    int ret;
    static char line_buff[PWD_BUFFER_SIZE];
    static struct passwd pwd;
    struct passwd *result;

    LOCK;
    if ((ret=fgetpwent_r(file, &pwd, line_buff, sizeof(line_buff), &result)) == 0) {
	UNLOCK;
	return &pwd;
    }
    UNLOCK;
    __set_errno(ret);
    return NULL;
}