mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-12-05 18:49:30 +00:00
150 lines
3.2 KiB
C
150 lines
3.2 KiB
C
/* Look up user and/or group names.
|
|
Copyright (C) 1988, 1992 Free Software Foundation
|
|
|
|
This file is part of GNU Tar.
|
|
|
|
GNU Tar 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 2, or (at your option)
|
|
any later version.
|
|
|
|
GNU Tar 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 GNU Tar; see the file COPYING. If not, write to
|
|
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
/*
|
|
* Look up user and/or group names.
|
|
*
|
|
* This file should be modified for non-unix systems to do something
|
|
* reasonable.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include "tar.h"
|
|
#include "port.h"
|
|
|
|
#ifndef NONAMES
|
|
/* Whole module goes away if NONAMES defined. Otherwise... */
|
|
#include <stdio.h>
|
|
#include <pwd.h>
|
|
#include <grp.h>
|
|
|
|
static int saveuid = -993;
|
|
static char saveuname[TUNMLEN];
|
|
static int my_uid = -993;
|
|
|
|
static int savegid = -993;
|
|
static char savegname[TGNMLEN];
|
|
static int my_gid = -993;
|
|
|
|
#define myuid ( my_uid < 0? (my_uid = getuid()): my_uid )
|
|
#define mygid ( my_gid < 0? (my_gid = getgid()): my_gid )
|
|
|
|
/*
|
|
* Look up a user or group name from a uid/gid, maintaining a cache.
|
|
* FIXME, for now it's a one-entry cache.
|
|
* FIXME2, the "-993" is to reduce the chance of a hit on the first lookup.
|
|
*
|
|
* This is ifdef'd because on Suns, it drags in about 38K of "yellow
|
|
* pages" code, roughly doubling the program size. Thanks guys.
|
|
*/
|
|
void
|
|
finduname (uname, uid)
|
|
char uname[TUNMLEN];
|
|
int uid;
|
|
{
|
|
struct passwd *pw;
|
|
#ifndef HAVE_GETPWUID
|
|
extern struct passwd *getpwuid ();
|
|
#endif
|
|
|
|
if (uid != saveuid)
|
|
{
|
|
saveuid = uid;
|
|
saveuname[0] = '\0';
|
|
pw = getpwuid (uid);
|
|
if (pw)
|
|
strncpy (saveuname, pw->pw_name, TUNMLEN);
|
|
}
|
|
strncpy (uname, saveuname, TUNMLEN);
|
|
}
|
|
|
|
int
|
|
finduid (uname)
|
|
char uname[TUNMLEN];
|
|
{
|
|
struct passwd *pw;
|
|
extern struct passwd *getpwnam ();
|
|
|
|
if (uname[0] != saveuname[0] /* Quick test w/o proc call */
|
|
|| 0 != strncmp (uname, saveuname, TUNMLEN))
|
|
{
|
|
strncpy (saveuname, uname, TUNMLEN);
|
|
pw = getpwnam (uname);
|
|
if (pw)
|
|
{
|
|
saveuid = pw->pw_uid;
|
|
}
|
|
else
|
|
{
|
|
saveuid = myuid;
|
|
}
|
|
}
|
|
return saveuid;
|
|
}
|
|
|
|
|
|
void
|
|
findgname (gname, gid)
|
|
char gname[TGNMLEN];
|
|
int gid;
|
|
{
|
|
struct group *gr;
|
|
#ifndef HAVE_GETGRGID
|
|
extern struct group *getgrgid ();
|
|
#endif
|
|
|
|
if (gid != savegid)
|
|
{
|
|
savegid = gid;
|
|
savegname[0] = '\0';
|
|
(void) setgrent ();
|
|
gr = getgrgid (gid);
|
|
if (gr)
|
|
strncpy (savegname, gr->gr_name, TGNMLEN);
|
|
}
|
|
(void) strncpy (gname, savegname, TGNMLEN);
|
|
}
|
|
|
|
|
|
int
|
|
findgid (gname)
|
|
char gname[TUNMLEN];
|
|
{
|
|
struct group *gr;
|
|
extern struct group *getgrnam ();
|
|
|
|
if (gname[0] != savegname[0] /* Quick test w/o proc call */
|
|
|| 0 != strncmp (gname, savegname, TUNMLEN))
|
|
{
|
|
strncpy (savegname, gname, TUNMLEN);
|
|
gr = getgrnam (gname);
|
|
if (gr)
|
|
{
|
|
savegid = gr->gr_gid;
|
|
}
|
|
else
|
|
{
|
|
savegid = mygid;
|
|
}
|
|
}
|
|
return savegid;
|
|
}
|
|
|
|
#endif
|