134 lines
3.0 KiB
C
134 lines
3.0 KiB
C
/* Look up user and/or group names.
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Copyright (C) 1988 Free Software Foundation
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This file is part of GNU Tar.
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GNU Tar is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 1, or (at your option)
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any later version.
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GNU Tar is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Tar; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/*
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* Look up user and/or group names.
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*
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* This file should be modified for non-unix systems to do something
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* reasonable.
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*
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* @(#)names.c 1.3 10/30/87 - gnu
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*/
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#include <sys/types.h>
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#include "tar.h"
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extern char *strncpy();
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#ifndef NONAMES
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/* Whole module goes away if NONAMES defined. Otherwise... */
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#include <pwd.h>
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#include <grp.h>
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static int saveuid = -993;
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static char saveuname[TUNMLEN];
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static int my_uid = -993;
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static int savegid = -993;
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static char savegname[TGNMLEN];
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static int my_gid = -993;
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#define myuid ( my_uid < 0? (my_uid = getuid()): my_uid )
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#define mygid ( my_gid < 0? (my_gid = getgid()): my_gid )
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/*
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* Look up a user or group name from a uid/gid, maintaining a cache.
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* FIXME, for now it's a one-entry cache.
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* FIXME2, the "-993" is to reduce the chance of a hit on the first lookup.
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*
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* This is ifdef'd because on Suns, it drags in about 38K of "yellow
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* pages" code, roughly doubling the program size. Thanks guys.
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*/
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void
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finduname(uname, uid)
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char uname[TUNMLEN];
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int uid;
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{
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struct passwd *pw;
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if (uid != saveuid) {
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saveuid = uid;
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saveuname[0] = '\0';
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pw = getpwuid(uid);
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if (pw)
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strncpy(saveuname, pw->pw_name, TUNMLEN);
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}
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strncpy(uname, saveuname, TUNMLEN);
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}
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int
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finduid(uname)
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char uname[TUNMLEN];
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{
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struct passwd *pw;
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extern struct passwd *getpwnam();
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if (uname[0] != saveuname[0] /* Quick test w/o proc call */
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|| 0!=strncmp(uname, saveuname, TUNMLEN)) {
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strncpy(saveuname, uname, TUNMLEN);
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pw = getpwnam(uname);
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if (pw) {
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saveuid = pw->pw_uid;
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} else {
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saveuid = myuid;
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}
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}
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return saveuid;
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}
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void
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findgname(gname, gid)
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char gname[TGNMLEN];
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int gid;
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{
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struct group *gr;
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if (gid != savegid) {
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savegid = gid;
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savegname[0] = '\0';
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(void)setgrent();
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gr = getgrgid(gid);
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if (gr)
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strncpy(savegname, gr->gr_name, TGNMLEN);
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}
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(void) strncpy(gname, savegname, TGNMLEN);
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}
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int
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findgid(gname)
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char gname[TUNMLEN];
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{
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struct group *gr;
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extern struct group *getgrnam();
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if (gname[0] != savegname[0] /* Quick test w/o proc call */
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|| 0!=strncmp(gname, savegname, TUNMLEN)) {
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strncpy(savegname, gname, TUNMLEN);
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gr = getgrnam(gname);
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if (gr) {
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savegid = gr->gr_gid;
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} else {
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savegid = mygid;
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}
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}
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return savegid;
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}
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#endif
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