[unix-history] / lib / libc / gen / getgrent.c

/*
 * Copyright (c) 1989 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. 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getgrent.c	5.9 (Berkeley) 4/1/91";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <stdio.h>
#include <stdlib.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
start_gr()
{
	if (_gr_fp) {
		rewind(_gr_fp);
		return(1);
	}
	return((_gr_fp = fopen(_PATH_GROUP, "r")) ? 1 : 0);
}

int
setgrent()
{
	return(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
grscan(search, gid, name)
	register int search, gid;
	register char *name;
{
	register char *cp, **m;
	char *bp;
	char *fgets(), *strsep(), *index();

	for (;;) {
		if (!fgets(line, sizeof(line), _gr_fp))
			return(0);
		bp = line;
		/* skip lines that are too big */
		if (!index(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;
		for (m = _gr_group.gr_mem = members;; ++m) {
			if (m == &members[MAXGRP - 1]) {
				*m = NULL;
				break;
			}
			if ((*m = strsep(&bp, ", \n")) == NULL)
				break;
		}
		return(1);
	}
	/* NOTREACHED */
}
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1989 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	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. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#if defined(LIBC_SCCS) && !defined(lint)
	35	static char sccsid[] = "@(#)getgrent.c 5.9 (Berkeley) 4/1/91";
	36	#endif /* LIBC_SCCS and not lint */
	37
	38	#include <sys/types.h>
	39	#include <stdio.h>
	40	#include <stdlib.h>
	41	#include <grp.h>
	42
	43	static FILE *_gr_fp;
	44	static struct group _gr_group;
	45	static int _gr_stayopen;
	46	static int grscan(), start_gr();
	47
	48	#define MAXGRP 200
	49	static char *members[MAXGRP];
	50	#define MAXLINELENGTH 1024
	51	static char line[MAXLINELENGTH];
	52
	53	struct group *
	54	getgrent()
	55	{
	56	if (!_gr_fp && !start_gr() \|\| !grscan(0, 0, NULL))
	57	return(NULL);
	58	return(&_gr_group);
	59	}
	60
	61	struct group *
	62	getgrnam(name)
	63	const char *name;
	64	{
65	int rval;
66
67	if (!start_gr())
68	return(NULL);
69	rval = grscan(1, 0, name);
70	if (!_gr_stayopen)
71	endgrent();
72	return(rval ? &_gr_group : NULL);
73	}
74
75	struct group *
76	#ifdef __STDC__
77	getgrgid(gid_t gid)
78	#else
79	getgrgid(gid)
80	gid_t gid;
81	#endif
82	{
83	int rval;
84
85	if (!start_gr())
86	return(NULL);
87	rval = grscan(1, gid, NULL);
88	if (!_gr_stayopen)
89	endgrent();
90	return(rval ? &_gr_group : NULL);
91	}
92
93	static
94	start_gr()
95	{
96	if (_gr_fp) {
97	rewind(_gr_fp);
98	return(1);
99	}
100	return((_gr_fp = fopen(_PATH_GROUP, "r")) ? 1 : 0);
101	}
102
103	int
104	setgrent()
105	{
106	return(setgroupent(0));
107	}
108
109	int
110	setgroupent(stayopen)
111	int stayopen;
112	{
113	if (!start_gr())
114	return(0);
115	_gr_stayopen = stayopen;
116	return(1);
117	}
118
119	void
120	endgrent()
121	{
122	if (_gr_fp) {
123	(void)fclose(_gr_fp);
124	_gr_fp = NULL;
125	}
126	}
127
128	static
129	grscan(search, gid, name)
130	register int search, gid;
131	register char *name;
132	{
133	register char cp, *m;
134	char *bp;
135	char fgets(), strsep(), *index();
136
137	for (;;) {
138	if (!fgets(line, sizeof(line), _gr_fp))
139	return(0);
140	bp = line;
141	/* skip lines that are too big */
142	if (!index(line, '\n')) {
143	int ch;
144
145	while ((ch = getc(_gr_fp)) != '\n' && ch != EOF)
146	;
147	continue;
148	}
149	_gr_group.gr_name = strsep(&bp, ":\n");
150	if (search && name && strcmp(_gr_group.gr_name, name))
151	continue;
152	_gr_group.gr_passwd = strsep(&bp, ":\n");
153	if (!(cp = strsep(&bp, ":\n")))
154	continue;
155	_gr_group.gr_gid = atoi(cp);
156	if (search && name == NULL && _gr_group.gr_gid != gid)
157	continue;
158	for (m = _gr_group.gr_mem = members;; ++m) {
159	if (m == &members[MAXGRP - 1]) {
160	*m = NULL;
161	break;
162	}
163	if ((*m = strsep(&bp, ", \n")) == NULL)
164	break;
165	}
166	return(1);
167	}
168	/* NOTREACHED */
169	}