116 lines
3.1 KiB
C
116 lines
3.1 KiB
C
/*
|
|
* __getpwent.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 "busybox.h"
|
|
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <fcntl.h>
|
|
#include "pwd_.h"
|
|
|
|
#define PWD_BUFFER_SIZE 256
|
|
|
|
/* This isn't as flash as my previous version -- it doesn't dynamically
|
|
scale down the gecos on too-long lines, but it also makes fewer syscalls,
|
|
so it's probably nicer. Write me if you want the old version. Maybe I
|
|
should include it as a build-time option... ?
|
|
-Nat <ndf@linux.mit.edu> */
|
|
|
|
struct passwd *__getpwent(int pwd_fd)
|
|
{
|
|
static char line_buff[PWD_BUFFER_SIZE];
|
|
static struct passwd passwd;
|
|
char *field_begin;
|
|
char *endptr;
|
|
char *gid_ptr=NULL;
|
|
char *uid_ptr=NULL;
|
|
int line_len;
|
|
int i;
|
|
|
|
/* We use the restart label to handle malformatted lines */
|
|
restart:
|
|
/* Read the passwd line into the static buffer using a minimal of
|
|
syscalls. */
|
|
if ((line_len = read(pwd_fd, line_buff, PWD_BUFFER_SIZE)) <= 0)
|
|
return NULL;
|
|
field_begin = strchr(line_buff, '\n');
|
|
if (field_begin != NULL)
|
|
lseek(pwd_fd, (long) (1 + field_begin - (line_buff + line_len)),
|
|
SEEK_CUR);
|
|
else { /* The line is too long - skip it. :-\ */
|
|
|
|
do {
|
|
if ((line_len = read(pwd_fd, line_buff, PWD_BUFFER_SIZE)) <= 0)
|
|
return NULL;
|
|
} while (!(field_begin = strchr(line_buff, '\n')));
|
|
lseek(pwd_fd, (long) (field_begin - line_buff) - line_len + 1,
|
|
SEEK_CUR);
|
|
goto restart;
|
|
}
|
|
if (*line_buff == '#' || *line_buff == ' ' || *line_buff == '\n' ||
|
|
*line_buff == '\t')
|
|
goto restart;
|
|
*field_begin = '\0';
|
|
|
|
/* We've read the line; now parse it. */
|
|
field_begin = line_buff;
|
|
for (i = 0; i < 7; i++) {
|
|
switch (i) {
|
|
case 0:
|
|
passwd.pw_name = field_begin;
|
|
break;
|
|
case 1:
|
|
passwd.pw_passwd = field_begin;
|
|
break;
|
|
case 2:
|
|
uid_ptr = field_begin;
|
|
break;
|
|
case 3:
|
|
gid_ptr = field_begin;
|
|
break;
|
|
case 4:
|
|
passwd.pw_gecos = field_begin;
|
|
break;
|
|
case 5:
|
|
passwd.pw_dir = field_begin;
|
|
break;
|
|
case 6:
|
|
passwd.pw_shell = field_begin;
|
|
break;
|
|
}
|
|
if (i < 6) {
|
|
field_begin = strchr(field_begin, ':');
|
|
if (field_begin == NULL)
|
|
goto restart;
|
|
*field_begin++ = '\0';
|
|
}
|
|
}
|
|
passwd.pw_gid = (gid_t) strtoul(gid_ptr, &endptr, 10);
|
|
if (*endptr != '\0')
|
|
goto restart;
|
|
|
|
passwd.pw_uid = (uid_t) strtoul(uid_ptr, &endptr, 10);
|
|
if (*endptr != '\0')
|
|
goto restart;
|
|
|
|
return &passwd;
|
|
}
|