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	1	/*
	2	* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
	11	*
	12	* This Original Code and all software distributed under the License are
	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/*
	23	* Copyright (c) 1985, 1993
	24	* The Regents of the University of California. All rights reserved.
	25	*
	26	* Redistribution and use in source and binary forms, with or without
	27	* modification, are permitted provided that the following conditions
	28	* are met:
	29	* 1. Redistributions of source code must retain the above copyright
	30	* notice, this list of conditions and the following disclaimer.
	31	* 2. Redistributions in binary form must reproduce the above copyright
	32	* notice, this list of conditions and the following disclaimer in the
	33	* documentation and/or other materials provided with the distribution.
	34	* 3. All advertising materials mentioning features or use of this software
	35	* must display the following acknowledgement:
	36	* This product includes software developed by the University of
	37	* California, Berkeley and its contributors.
	38	* 4. Neither the name of the University nor the names of its contributors
	39	* may be used to endorse or promote products derived from this software
	40	* without specific prior written permission.
	41	*
	42	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	43	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	44	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	45	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	46	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	47	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	48	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	49	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	50	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	51	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	52	* SUCH DAMAGE.
	53	*/
	54
	55
	56	#include <sys/param.h>
	57	#include <sys/file.h>
	58	#include <sys/stat.h>
	59	#include <stdio.h>
	60	#include <ctype.h>
	61	#include <stdlib.h>
	62	#include <unistd.h>
	63	#include <paths.h>
	64
	65	/*
	66	* Local shells should NOT be added here. They should be added in
	67	* /etc/shells.
	68	*/
	69
	70	static char *okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL };
	71	static char curshell, shells, *strings;
	72	static char **initshells __P((void));
	73
	74	/*
	75	* Get a list of shells from _PATH_SHELLS, if it exists.
	76	*/
	77	char *
	78	getusershell()
	79	{
	80	char *ret;
	81
	82	if (curshell == NULL)
	83	curshell = initshells();
	84	ret = *curshell;
	85	if (ret != NULL)
	86	curshell++;
	87	return (ret);
	88	}
	89
	90	void
	91	endusershell()
	92	{
	93
	94	if (shells != NULL)
	95	free(shells);
	96	shells = NULL;
	97	if (strings != NULL)
	98	free(strings);
	99	strings = NULL;
	100	curshell = NULL;
	101	}
	102
	103	void
	104	setusershell()
	105	{
	106
	107	curshell = initshells();
	108	}
	109
	110	static char **
	111	initshells()
	112	{
	113	register char *sp, cp;
	114	register FILE *fp;
	115	struct stat statb;
	116
	117	if (shells != NULL)
	118	free(shells);
	119	shells = NULL;
	120	if (strings != NULL)
	121	free(strings);
	122	strings = NULL;
	123	if ((fp = fopen(_PATH_SHELLS, "r")) == NULL)
	124	return (okshells);
	125	if (fstat(fileno(fp), &statb) == -1) {
	126	(void)fclose(fp);
	127	return (okshells);
	128	}
	129	if ((strings = malloc((u_int)statb.st_size)) == NULL) {
	130	(void)fclose(fp);
	131	return (okshells);
	132	}
	133	shells = calloc((unsigned)statb.st_size / 3, sizeof (char *));
	134	if (shells == NULL) {
	135	(void)fclose(fp);
	136	free(strings);
	137	strings = NULL;
	138	return (okshells);
	139	}
	140	sp = shells;
	141	cp = strings;
	142	while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) {
	143	while (cp != '#' && cp != '/' && *cp != '\0')
	144	cp++;
	145	if (cp == '#' \|\| cp == '\0')
	146	continue;
	147	*sp++ = cp;
	148	while (!isspace(cp) && cp != '#' && *cp != '\0')
	149	cp++;
	150	*cp++ = '\0';
	151	}
	152	*sp = NULL;
	153	(void)fclose(fp);
	154	return (shells);
	155	}