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/*
* Copyright (C) 2013 Canonical Limited
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the licence, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Ryan Lortie <desrt@desrt.ca>
*/
static gchar *
fgetpwent_getline (FILE *fp)
{
static GString str;
/* We could be "more clever" here and avoid the strlen() but this is a
* clear case of dumb is better.
*/
str.len = 0;
while (!str.len || str.str[str.len - 1] != '\n')
{
if (str.allocated_len < str.len + 32)
{
str.allocated_len = str.len + 32;
str.str = g_realloc (str.str, str.allocated_len);
}
if (fgets (str.str + str.len, str.allocated_len - str.len, fp) == NULL)
return NULL;
str.len = strlen (str.str + str.len) + str.len;
}
/* chomp the '\n' */
str.str[str.len - 1] = '\0';
return str.str;
}
static struct passwd *
fgetpwent (FILE *fp)
{
static struct passwd pw;
guint64 intval;
gchar *line;
/* In case of failure, we ignore the line and start again */
again:
line = fgetpwent_getline (fp);
if (!line)
return NULL;
while (g_ascii_isspace (*line))
line++;
/* comments, empty lines */
if (line[0] == '#' || line[0] == '\0')
goto again;
/* username */
pw.pw_name = line;
if (!(line = strchr (line, ':')))
goto again;
*line++ = '\0';
/* password */
pw.pw_passwd = line;
if (!(line = strchr (line, ':')))
goto again;
*line++ = '\0';
/* uid */
pw.pw_uid = intval = g_ascii_strtoull (line, &line, 10);
if (pw.pw_uid != intval || *line++ != ':')
goto again;
/* gid */
pw.pw_gid = intval = g_ascii_strtoull (line, &line, 10);
if (pw.pw_gid != intval || *line++ != ':')
goto again;
/* gecos */
pw.pw_gecos = line;
if (!(line = strchr (line, ':')))
goto again;
*line++ = '\0';
/* home directory */
pw.pw_dir = line;
if (!(line = strchr (line, ':')))
goto again;
*line++ = '\0';
/* shell */
pw.pw_shell = line;
return &pw;
}
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