mirror of
https://github.com/MidnightCommander/mc
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90 lines
2.1 KiB
C
90 lines
2.1 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 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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* 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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#include <stdio.h>
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#include <pwd.h>
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#include <grp.h>
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#include "names.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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int
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finduid (char *uname)
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{
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struct passwd *pw;
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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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int
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findgid (char *gname)
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{
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struct group *gr;
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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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