639c58312b
On MacOS the system already has user_from_uid and group_from_gid. These are renamed pwcache_get_user and pwcache_get_group. For the old library, pwcache_get_user needs to be exported for skill. References: https://gitlab.com/procps-ng/procps/issues/34 Signed-off-by: Craig Small <csmall@enc.com.au>
92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/*
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* pwcache.c - memory cache passwd file handling
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*
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* Copyright (C) 1992-1998 by Michael K. Johnson, johnsonm@redhat.com
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* Note: most likely none of his code remains
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*
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* Copyright 2002, Albert Cahalan
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <stdlib.h>
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#include <pwd.h>
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#include "alloc.h"
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#include "pwcache.h"
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#include <grp.h>
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// might as well fill cache lines... else we waste memory anyway
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#define HASHSIZE 64 /* power of 2 */
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#define HASH(x) ((x) & (HASHSIZE - 1))
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static struct pwbuf {
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struct pwbuf *next;
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uid_t uid;
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char name[P_G_SZ];
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} *pwhash[HASHSIZE];
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char *pwcache_get_user(uid_t uid) {
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struct pwbuf **p;
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struct passwd *pw;
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p = &pwhash[HASH(uid)];
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while (*p) {
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if ((*p)->uid == uid)
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return((*p)->name);
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p = &(*p)->next;
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}
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*p = (struct pwbuf *) xmalloc(sizeof(struct pwbuf));
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(*p)->uid = uid;
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pw = getpwuid(uid);
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if(!pw || strlen(pw->pw_name) >= P_G_SZ)
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sprintf((*p)->name, "%u", uid);
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else
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strcpy((*p)->name, pw->pw_name);
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(*p)->next = NULL;
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return((*p)->name);
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}
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static struct grpbuf {
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struct grpbuf *next;
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gid_t gid;
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char name[P_G_SZ];
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} *grphash[HASHSIZE];
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char *pwcache_get_group(gid_t gid) {
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struct grpbuf **g;
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struct group *gr;
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g = &grphash[HASH(gid)];
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while (*g) {
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if ((*g)->gid == gid)
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return((*g)->name);
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g = &(*g)->next;
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}
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*g = (struct grpbuf *) xmalloc(sizeof(struct grpbuf));
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(*g)->gid = gid;
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gr = getgrgid(gid);
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if (!gr || strlen(gr->gr_name) >= P_G_SZ)
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sprintf((*g)->name, "%u", gid);
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else
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strcpy((*g)->name, gr->gr_name);
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(*g)->next = NULL;
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return((*g)->name);
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}
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