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/* $NetBSD: getgrent.c,v 1.2 1995/10/13 18:10:23 gwr Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
* Portions Copyright (c) 1994, Jason Downs. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
/*
* Copied from: lib/libc/gen/getgrent.c
* and then gutted, leaving only /etc/group support.
*/
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <grp.h>
static FILE *_gr_fp;
static struct group _gr_group;
static int _gr_stayopen;
static int grscan(), start_gr();
#define MAXGRP 200
static char *members[MAXGRP];
#define MAXLINELENGTH 1024
static char line[MAXLINELENGTH];
struct group *
getgrent()
{
if (!_gr_fp && !start_gr() || !grscan(0, 0, NULL))
return(NULL);
return(&_gr_group);
}
struct group *
getgrnam(name)
const char *name;
{
int rval;
if (!start_gr())
return(NULL);
rval = grscan(1, 0, name);
if (!_gr_stayopen)
endgrent();
return(rval ? &_gr_group : NULL);
}
struct group *
#ifdef __STDC__
getgrgid(gid_t gid)
#else
getgrgid(gid)
gid_t gid;
#endif
{
int rval;
if (!start_gr())
return(NULL);
rval = grscan(1, gid, NULL);
if (!_gr_stayopen)
endgrent();
return(rval ? &_gr_group : NULL);
}
static int
start_gr()
{
if (_gr_fp) {
rewind(_gr_fp);
return(1);
}
return((_gr_fp = fopen(_PATH_GROUP, "r")) ? 1 : 0);
}
void
setgrent()
{
(void) setgroupent(0);
}
int
setgroupent(stayopen)
int stayopen;
{
if (!start_gr())
return(0);
_gr_stayopen = stayopen;
return(1);
}
void
endgrent()
{
if (_gr_fp) {
(void)fclose(_gr_fp);
_gr_fp = NULL;
}
}
static int
grscan(search, gid, name)
register int search, gid;
register char *name;
{
register char *cp, **m;
char *bp;
for (;;) {
if (!fgets(line, sizeof(line), _gr_fp))
return(0);
bp = line;
/* skip lines that are too big */
if (!strchr(line, '\n')) {
int ch;
while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
;
continue;
}
_gr_group.gr_name = strsep(&bp, ":\n");
if (search && name && strcmp(_gr_group.gr_name, name))
continue;
_gr_group.gr_passwd = strsep(&bp, ":\n");
if (!(cp = strsep(&bp, ":\n")))
continue;
_gr_group.gr_gid = atoi(cp);
if (search && name == NULL && _gr_group.gr_gid != gid)
continue;
cp = NULL;
if (bp == NULL)
continue;
for (m = _gr_group.gr_mem = members;; bp++) {
if (m == &members[MAXGRP - 1])
break;
if (*bp == ',') {
if (cp) {
*bp = '\0';
*m++ = cp;
cp = NULL;
}
} else if (*bp == '\0' || *bp == '\n' || *bp == ' ') {
if (cp) {
*bp = '\0';
*m++ = cp;
}
break;
} else if (cp == NULL)
cp = bp;
}
*m = NULL;
return(1);
}
/* NOTREACHED */
}
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