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 * 3. 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
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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
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29 * @(#)pwcache.c 8.1 (Berkeley) 6/4/93
30 * $FreeBSD: src/lib/libc/gen/pwcache.c,v 1.10 2002/03/22 02:35:47 imp Exp $
31 * $DragonFly: src/lib/libc/gen/pwcache.c,v 1.5 2005/11/13 00:07:42 swildner Exp $
34 #include <sys/types.h>
42 #define NCACHE 64 /* power of 2 */
43 #define MASK (NCACHE - 1) /* bits to store with */
46 user_from_uid(uid_t uid
, int nouser
)
48 static struct ncache
{
51 char name
[UT_NAMESIZE
+ 1];
57 cp
= c_uid
+ (uid
& MASK
);
58 if (cp
->uid
!= uid
|| !*cp
->name
) {
67 strncpy(cp
->name
, pw
->pw_name
, UT_NAMESIZE
);
68 cp
->name
[UT_NAMESIZE
] = '\0';
71 snprintf(cp
->name
, UT_NAMESIZE
, "%u", uid
);
76 return ((nouser
&& !cp
->found
) ? NULL
: cp
->name
);
80 group_from_gid(gid_t gid
, int nogroup
)
82 static struct ncache
{
85 char name
[UT_NAMESIZE
+ 1];
91 cp
= c_gid
+ (gid
& MASK
);
92 if (cp
->gid
!= gid
|| !*cp
->name
) {
101 strncpy(cp
->name
, gr
->gr_name
, UT_NAMESIZE
);
102 cp
->name
[UT_NAMESIZE
] = '\0';
105 snprintf(cp
->name
, UT_NAMESIZE
, "%u", gid
);
110 return ((nogroup
&& !cp
->found
) ? NULL
: cp
->name
);