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/* $OpenBSD: pwcache.c,v 1.9 2005/08/08 08:05:34 espie Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/* OPENBSD ORIGINAL: lib/libc/gen/pwcache.c */
#include <sys/types.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define NCACHE 64 /* power of 2 */
#define MASK (NCACHE - 1) /* bits to store with */
#ifndef HAVE_USER_FROM_UID
char *
user_from_uid(uid_t uid, int nouser)
{
static struct ncache {
uid_t uid;
char *name;
} c_uid[NCACHE];
static int pwopen;
static char nbuf[15]; /* 32 bits == 10 digits */
struct passwd *pw;
struct ncache *cp;
cp = c_uid + (uid & MASK);
if (cp->uid != uid || cp->name == NULL) {
#ifdef HAVE_SETPASSENT
if (pwopen == 0) {
setpassent(1);
pwopen = 1;
}
#endif
if ((pw = getpwuid(uid)) == NULL) {
if (nouser)
return (NULL);
(void)snprintf(nbuf, sizeof(nbuf), "%u", uid);
}
cp->uid = uid;
if (cp->name != NULL)
free(cp->name);
cp->name = strdup(pw ? pw->pw_name : nbuf);
}
return (cp->name);
}
#endif
#ifndef HAVE_GROUP_FROM_GID
char *
group_from_gid(gid_t gid, int nogroup)
{
static struct ncache {
gid_t gid;
char *name;
} c_gid[NCACHE];
static int gropen;
static char nbuf[15]; /* 32 bits == 10 digits */
struct group *gr;
struct ncache *cp;
cp = c_gid + (gid & MASK);
if (cp->gid != gid || cp->name == NULL) {
#ifdef HAVE_SETGROUPENT
if (gropen == 0) {
setgroupent(1);
gropen = 1;
}
#endif
if ((gr = getgrgid(gid)) == NULL) {
if (nogroup)
return (NULL);
(void)snprintf(nbuf, sizeof(nbuf), "%u", gid);
}
cp->gid = gid;
if (cp->name != NULL)
free(cp->name);
cp->name = strdup(gr ? gr->gr_name : nbuf);
}
return (cp->name);
}
#endif
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