81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
// Copyright (C) 1992-1998 by Michael K. Johnson, johnsonm@redhat.com
|
|
// Note: most likely none of his code remains
|
|
//
|
|
// Copyright 2002, Albert Cahalan
|
|
//
|
|
// This file is placed under the conditions of the GNU Library
|
|
// General Public License, version 2, or any later version.
|
|
// See file COPYING for information on distribution conditions.
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <sys/types.h>
|
|
#include <stdlib.h>
|
|
#include <pwd.h>
|
|
#include "alloc.h"
|
|
#include "pwcache.h"
|
|
#include <grp.h>
|
|
|
|
// might as well fill cache lines... else we waste memory anyway
|
|
|
|
#define HASHSIZE 64 /* power of 2 */
|
|
#define HASH(x) ((x) & (HASHSIZE - 1))
|
|
|
|
static struct pwbuf {
|
|
struct pwbuf *next;
|
|
uid_t uid;
|
|
char name[P_G_SZ];
|
|
} *pwhash[HASHSIZE];
|
|
|
|
char *user_from_uid(uid_t uid) {
|
|
struct pwbuf **p;
|
|
struct passwd *pw;
|
|
size_t len;
|
|
|
|
p = &pwhash[HASH(uid)];
|
|
while (*p) {
|
|
if ((*p)->uid == uid)
|
|
return((*p)->name);
|
|
p = &(*p)->next;
|
|
}
|
|
*p = (struct pwbuf *) xmalloc(sizeof(struct pwbuf));
|
|
(*p)->uid = uid;
|
|
pw = getpwuid(uid);
|
|
len = pw ? strlen(pw) : 0;
|
|
if (len >= P_G_SZ)
|
|
sprintf((*p)->name, "%u", uid);
|
|
else
|
|
strcpy((*p)->name, pw->pw_name);
|
|
(*p)->next = NULL;
|
|
return((*p)->name);
|
|
}
|
|
|
|
static struct grpbuf {
|
|
struct grpbuf *next;
|
|
gid_t gid;
|
|
char name[P_G_SZ];
|
|
} *grphash[HASHSIZE];
|
|
|
|
char *group_from_gid(gid_t gid) {
|
|
struct grpbuf **g;
|
|
struct group *gr;
|
|
size_t len;
|
|
|
|
g = &grphash[HASH(gid)];
|
|
while (*g) {
|
|
if ((*g)->gid == gid)
|
|
return((*g)->name);
|
|
g = &(*g)->next;
|
|
}
|
|
*g = (struct grpbuf *) malloc(sizeof(struct grpbuf));
|
|
(*g)->gid = gid;
|
|
gr = getgrgid(gid);
|
|
len = gr ? strlen(gr) : 0;
|
|
if (len >= P_G_SZ)
|
|
sprintf((*g)->name, "%u", gid);
|
|
else
|
|
strcpy((*g)->name, gr->gr_name);
|
|
(*g)->next = NULL;
|
|
return((*g)->name);
|
|
}
|