141 lines
3.6 KiB
C
141 lines
3.6 KiB
C
/* $NetBSD: pwd.c,v 1.19 2003/10/30 13:52:23 dsl Exp $ */
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/*
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* Copyright (c) 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1991, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)pwd.c 8.3 (Berkeley) 4/1/94";
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#else
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__RCSID("$NetBSD: pwd.c,v 1.19 2003/10/30 13:52:23 dsl Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static char *getcwd_logical(void);
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static void usage(void);
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/*
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* Note that EEE Std 1003.1, 2003 requires that the default be -L.
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* This is inconsistent with the historic behaviour of everything
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* except the ksh builtin.
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* To avoid breaking scripts the default has been kept as -P.
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* (Some scripts run /bin/pwd in order to get 'pwd -P'.)
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*/
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int
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main(int argc, char *argv[])
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{
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int ch, lFlag;
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const char *p;
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setprogname(argv[0]);
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lFlag = 0;
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while ((ch = getopt(argc, argv, "LP")) != -1) {
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switch (ch) {
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case 'L':
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lFlag = 1;
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break;
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case 'P':
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lFlag = 0;
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break;
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case '?':
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc != 0)
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usage();
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if (lFlag)
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p = getcwd_logical();
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else
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p = NULL;
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if (p == NULL)
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p = getcwd(NULL, 0);
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if (p == NULL)
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err(EXIT_FAILURE, NULL);
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(void)printf("%s\n", p);
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exit(EXIT_SUCCESS);
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/* NOTREACHED */
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}
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static char *
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getcwd_logical(void)
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{
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char *pwd;
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struct stat s_pwd, s_dot;
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/* Check $PWD -- if it's right, it's fast. */
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pwd = getenv("PWD");
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if (pwd == NULL)
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return NULL;
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if (pwd[0] != '/')
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return NULL;
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if (strstr(pwd, "/./") != NULL)
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return NULL;
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if (strstr(pwd, "/../") != NULL)
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return NULL;
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if (stat(pwd, &s_pwd) == -1 || stat(".", &s_dot) == -1)
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return NULL;
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if (s_pwd.st_dev != s_dot.st_dev || s_pwd.st_ino != s_dot.st_ino)
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return NULL;
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return pwd;
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: %s [-LP]\n", getprogname());
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exit(EXIT_FAILURE);
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/* NOTREACHED */
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}
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