120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)pwcache.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/types.h>
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#include <grp.h>
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#include <string.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <utmp.h>
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#define NCACHE 64 /* power of 2 */
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#define MASK (NCACHE - 1) /* bits to store with */
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char *
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user_from_uid(uid, nouser)
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uid_t uid;
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int nouser;
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{
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static struct ncache {
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uid_t uid;
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int found;
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char name[UT_NAMESIZE + 1];
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} c_uid[NCACHE];
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static int pwopen;
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register struct passwd *pw;
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register struct ncache *cp;
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cp = c_uid + (uid & MASK);
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if (cp->uid != uid || !*cp->name) {
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if (pwopen == 0) {
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setpassent(1);
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pwopen = 1;
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}
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pw = getpwuid(uid);
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cp->uid = uid;
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if (pw != NULL) {
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cp->found = 1;
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(void)strncpy(cp->name, pw->pw_name, UT_NAMESIZE);
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cp->name[UT_NAMESIZE] = '\0';
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} else {
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cp->found = 0;
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(void)snprintf(cp->name, UT_NAMESIZE, "%u", uid);
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if (nouser)
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return (NULL);
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}
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}
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return ((nouser && !cp->found) ? NULL : cp->name);
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}
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char *
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group_from_gid(gid, nogroup)
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gid_t gid;
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int nogroup;
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{
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static struct ncache {
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gid_t gid;
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int found;
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char name[UT_NAMESIZE + 1];
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} c_gid[NCACHE];
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static int gropen;
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struct group *gr;
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struct ncache *cp;
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cp = c_gid + (gid & MASK);
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if (cp->gid != gid || !*cp->name) {
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if (gropen == 0) {
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setgroupent(1);
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gropen = 1;
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}
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gr = getgrgid(gid);
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cp->gid = gid;
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if (gr != NULL) {
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cp->found = 1;
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(void)strncpy(cp->name, gr->gr_name, UT_NAMESIZE);
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cp->name[UT_NAMESIZE] = '\0';
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} else {
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cp->found = 0;
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(void)snprintf(cp->name, UT_NAMESIZE, "%u", gid);
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if (nogroup)
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return (NULL);
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}
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}
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return ((nogroup && !cp->found) ? NULL : cp->name);
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}
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