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Commit	Line	Data
	1	/* $NetBSD: pwd.c,v 1.10 1998/07/28 05:31:26 mycroft Exp $ */
	2
	3	/*
	4	* Copyright (c) 1991, 1993, 1994
	5	* The Regents of the University of California. All rights reserved.
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	10	* 1. Redistributions of source code must retain the above copyright
	11	* notice, this list of conditions and the following disclaimer.
	12	* 2. Redistributions in binary form must reproduce the above copyright
	13	* notice, this list of conditions and the following disclaimer in the
	14	* documentation and/or other materials provided with the distribution.
	15	* 3. All advertising materials mentioning features or use of this software
	16	* must display the following acknowledgement:
	17	* This product includes software developed by the University of
	18	* California, Berkeley and its contributors.
	19	* 4. Neither the name of the University nor the names of its contributors
	20	* may be used to endorse or promote products derived from this software
	21	* without specific prior written permission.
	22	*
	23	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	24	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	25	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	26	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	28	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	29	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	30	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	31	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	32	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	33	* SUCH DAMAGE.
	34	*/
	35
	36	#include <sys/cdefs.h>
	37	#ifndef lint
	38	__COPYRIGHT("@(#) Copyright (c) 1991, 1993, 1994\n\
	39	The Regents of the University of California. All rights reserved.\n");
	40	#endif /* not lint */
	41
	42	#ifndef lint
	43	#if 0
	44	static char sccsid[] = "@(#)pwd.c 8.3 (Berkeley) 4/1/94";
	45	#else
	46	__RCSID("$NetBSD: pwd.c,v 1.10 1998/07/28 05:31:26 mycroft Exp $");
	47	#endif
	48	#endif /* not lint */
	49
	50	#include <err.h>
	51	#include <stdio.h>
	52	#include <stdlib.h>
	53	#include <unistd.h>
	54	#include <sys/param.h>
	55	#include <sys/stat.h>
	56	#include <errno.h>
	57	#include <string.h>
	58
	59	char getcwd_logical __P((char , size_t));
	60	void usage __P((void));
	61	int main __P((int, char *[]));
	62
	63	int
	64	main(argc, argv)
	65	int argc;
	66	char *argv[];
	67	{
	68	int ch;
	69	int lFlag=0;
	70	char *p = NULL;
	71
	72	while ((ch = getopt(argc, argv, "LP")) != -1)
	73	switch (ch) {
	74	case 'L':
	75	lFlag=1;
	76	break;
	77	case 'P':
	78	lFlag=0;
	79	break;
	80	case '?':
	81	default:
	82	usage();
	83	}
	84	argc -= optind;
	85	argv += optind;
	86
	87	if (argc != 0)
	88	usage();
	89
	90	if (lFlag)
	91	p = getcwd_logical(NULL, 0);
	92	else
	93	p = getcwd(NULL, 0);
	94
	95	if (p == NULL) err(1, "%s", "");
	96
	97	(void)printf("%s\n", p);
	98
	99	exit(0);
	100	/* NOTREACHED */
	101	}
	102
	103	char *
	104	getcwd_logical(pt, size)
	105	char *pt;
	106	size_t size;
	107	{
	108	char *pwd;
	109	size_t pwdlen;
	110	dev_t dev;
	111	ino_t ino;
	112	struct stat s;
	113
	114	/* Check $PWD -- if it's right, it's fast. */
	115	if ((pwd = getenv("PWD")) != NULL && pwd[0] == '/' && stat(pwd, &s) != -1) {
	116	dev = s.st_dev;
	117	ino = s.st_ino;
	118	if (stat(".", &s) != -1 && dev == s.st_dev && ino == s.st_ino) {
	119	pwdlen = strlen(pwd);
	120	if (pt) {
	121	if (!size) {
	122	errno = EINVAL;
	123	return (NULL);
	124	}
	125	if (pwdlen + 1 > size) {
	126	errno = ERANGE;
	127	return (NULL);
	128	}
	129	} else if ((pt = malloc(pwdlen + 1)) == NULL) {
	130	errno = ENOMEM;
	131	return (NULL);
	132	}
	133	memmove(pt, pwd, pwdlen);
	134	pt[pwdlen] = '\0';
	135	return (pt);
	136	}
	137	}
	138
	139	return (NULL);
	140	}
	141
	142	void
	143	usage()
	144	{
	145	(void)fprintf(stderr, "usage: pwd [-LP]\n");
	146	exit(1);
	147	/* NOTREACHED */
	148	}