uclibc-ng/libc/pwd_grp/__getspent_r.c

/* vi: set sw=4 ts=4: */
/* __getspent_r.c - Based on __getpwent_r.c
 * Copyright (C) 2001-2003 Erik Andersen <andersee@debian.org>
 * 
 *  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 <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include "config.h"


int __getspent_r(struct spwd * spwd, char * line_buff, size_t buflen, int spwd_fd)
{
	char *endptr;
	int line_len;

	if (buflen<PWD_BUFFER_SIZE)
		return ERANGE;

	/* We use the restart label to handle malformatted lines */
restart:
	/* Read the shadow line into the buffer using a minimum of syscalls. */
	if ((line_len = read(spwd_fd, line_buff, buflen)) <= 0)
		return EIO;
	endptr = strchr(line_buff, '\n');
	if (endptr != NULL)
		lseek(spwd_fd, (long) (1 + endptr - (line_buff + line_len)), SEEK_CUR);
	else {
		/* The line is too long - skip it. :-\ */
		do {
			if ((line_len = read(spwd_fd, line_buff, buflen)) <= 0)
				return EIO;
		} while (!(endptr = strchr(line_buff, '\n')));
		lseek(spwd_fd, (long) (endptr - line_buff) - line_len + 1, SEEK_CUR);
		goto restart;
	}

	if (__sgetspent_r(line_buff, spwd, line_buff, buflen) != 0)
		goto restart;

	return 0;
}