2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)pwcache.c 8.1 (Berkeley) 6/4/93";
32 #endif /* LIBC_SCCS and not lint */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/types.h>
44 #define NCACHE 64 /* power of 2 */
45 #define MASK (NCACHE - 1) /* bits to store with */
48 user_from_uid(uid_t uid, int nouser)
50 static struct ncache {
53 char name[UT_NAMESIZE + 1];
59 cp = c_uid + (uid & MASK);
60 if (cp->uid != uid || !*cp->name) {
69 (void)strncpy(cp->name, pw->pw_name, UT_NAMESIZE);
70 cp->name[UT_NAMESIZE] = '\0';
73 (void)snprintf(cp->name, UT_NAMESIZE, "%u", uid);
78 return ((nouser && !cp->found) ? NULL : cp->name);
82 group_from_gid(gid_t gid, int nogroup)
84 static struct ncache {
87 char name[UT_NAMESIZE + 1];
93 cp = c_gid + (gid & MASK);
94 if (cp->gid != gid || !*cp->name) {
103 (void)strncpy(cp->name, gr->gr_name, UT_NAMESIZE);
104 cp->name[UT_NAMESIZE] = '\0';
107 (void)snprintf(cp->name, UT_NAMESIZE, "%u", gid);
112 return ((nogroup && !cp->found) ? NULL : cp->name);