mirror of
https://github.com/MidnightCommander/mc
synced 2024-12-23 21:06:52 +03:00
136 lines
3.0 KiB
C
136 lines
3.0 KiB
C
/* Look up user and/or group names.
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Copyright (C) 1988, 1992 Free Software Foundation
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From GNU Tar.
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GNU Tar is free software; you can redistribute it and/or modify it
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under the terms of the GNU Library General Public License as published
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by the Free Software Foundation; either version 2, 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 Library General Public License for more details.
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* Namespace: finduname, finduid, findgname, findgid.
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*/
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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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#include <config.h>
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#include <sys/types.h>
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#include <string.h>
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#include <unistd.h>
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#define TAR_NAMES
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#include "tar.h"
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#include "names.h"
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#include <stdio.h>
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#include <pwd.h>
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#include <grp.h>
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#ifndef TUNMLEN
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#define TUNMLEN 256
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#endif
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#ifndef TGNMLEN
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#define TGNMLEN 256
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#endif
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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 finduname (char *uname, int uid)
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{
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struct passwd *pw;
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#ifndef HAVE_GETPWUID
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extern struct passwd *getpwuid ();
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#endif
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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 finduid (char *uname)
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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 findgname (char *gname, int gid)
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{
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struct group *gr;
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#ifndef HAVE_GETGRGID
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extern struct group *getgrgid ();
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#endif
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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 findgid (char *gname)
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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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