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/* userdata.c - get data on users (from /etc/passwd)
Copyright 1999-2017 Free Software Foundation, Inc.
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, 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 Street - Fifth Floor, Boston, MA
02110-1301, USA. */
#include <config.h>
#include <string.h>
#include <pwd.h>
#include "system.h"
#include "xalloc.h"
#include "userdata.h"
#include "routines.h"
void
userdata_get (struct userdata *udata)
{
struct passwd *passwd = NULL;
const char *home, *login;
char *comments = NULL, *name = NULL, *cp;
passwd = getpwuid (getuid ());
/* Home dir. */
if ((cp = getenv ("HOME")))
home = cp;
else if (passwd && passwd->pw_dir)
home = passwd->pw_dir;
else
home = "/home";
/* Login. */
if ((cp = getenv ("LOGNAME")))
login = cp;
else if ((cp = getenv ("USERNAME")))
login = cp;
else if (passwd && passwd->pw_name)
login = passwd->pw_name;
else
login = NULL;
/* The field `pw_gecos' contains the full name and comments, such as
phone number etc. */
if (passwd && passwd->pw_gecos)
{
char *gecos = NULL;
if (login)
{
/* Occurences of `&' in the gecos should be substituted with
the login (first letter in uppercase). */
size_t amps = 0; /* Number of ampersands. */
char *cp2;
for (cp = passwd->pw_gecos; *cp; cp++)
if (*cp == '&')
amps++;
gecos = ALLOCA (char,
(strlen (passwd->pw_gecos)
+ amps * (strlen (login) - 1) + 1));
cp2 = gecos;
for (cp = passwd->pw_gecos; *cp; cp++)
if (*cp == '&')
{
*cp2++ = (char) toupper (*login);
cp2 = stpcpy (cp2, login + 1);
}
else
*cp2++ = *cp;
*cp2 = '\0';
}
else
{
gecos = ALLOCA (char, strlen (passwd->pw_gecos) + 1);
stpcpy (gecos, passwd->pw_gecos);
}
/* The gecos may have subfields seperated by `,'. Consider the
first field to be the user name, and the rest to be
comments. */
name = gecos;
if ((comments = strchr (gecos, ',')))
{
*comments = '\0';
comments++;
}
}
udata->login = xstrdup (login ? login : _("user"));
udata->name = xstrdup (name ? name : _("Unknown User"));
udata->comments = comments ? xstrdup (comments) : NULL;
udata->home = xstrdup (home ? home : "/home");
}
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