1 files changed, 143 insertions, 0 deletions
diff --git a/bin/pwd/pwd.c b/bin/pwd/pwd.c
new file mode 100644
index 0000000..27888eb
--- /dev/null
+++ b/bin/pwd/pwd.c
@@ -0,0 +1,143 @@
+/* $NetBSD: pwd.c,v 1.22 2011/08/29 14:51:19 joerg Exp $ */
+
+/*
+ * Copyright (c) 1991, 1993, 1994
+ *	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. 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.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+__COPYRIGHT("@(#) Copyright (c) 1991, 1993, 1994\
+ The Regents of the University of California.  All rights reserved.");
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)pwd.c	8.3 (Berkeley) 4/1/94";
+#else
+__RCSID("$NetBSD: pwd.c,v 1.22 2011/08/29 14:51:19 joerg Exp $");
+#endif
+#endif /* not lint */
+
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <err.h>
+#include <errno.h>
+#include <locale.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static char *getcwd_logical(void);
+__dead static void usage(void);
+
+/*
+ * Note that EEE Std 1003.1, 2003 requires that the default be -L.
+ * This is inconsistent with the historic behaviour of everything
+ * except the ksh builtin.
+ * To avoid breaking scripts the default has been kept as -P.
+ * (Some scripts run /bin/pwd in order to get 'pwd -P'.)
+ */
+
+int
+main(int argc, char *argv[])
+{
+	int ch, lFlag;
+	const char *p;
+
+	setprogname(argv[0]);
+	(void)setlocale(LC_ALL, "");
+
+	lFlag = 0;
+	while ((ch = getopt(argc, argv, "LP")) != -1) {
+		switch (ch) {
+		case 'L':
+			lFlag = 1;
+			break;
+		case 'P':
+			lFlag = 0;
+			break;
+		case '?':
+		default:
+			usage();
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	if (argc != 0)
+		usage();
+
+	if (lFlag)
+		p = getcwd_logical();
+	else
+		p = NULL;
+	if (p == NULL)
+		p = getcwd(NULL, 0);
+
+	if (p == NULL)
+		err(EXIT_FAILURE, NULL);
+
+	(void)printf("%s\n", p);
+
+	exit(EXIT_SUCCESS);
+	/* NOTREACHED */
+}
+
+static char *
+getcwd_logical(void)
+{
+	char *pwd;
+	struct stat s_pwd, s_dot;
+
+	/* Check $PWD -- if it's right, it's fast. */
+	pwd = getenv("PWD");
+	if (pwd == NULL)
+		return NULL;
+	if (pwd[0] != '/')
+		return NULL;
+	if (strstr(pwd, "/./") != NULL)
+		return NULL;
+	if (strstr(pwd, "/../") != NULL)
+		return NULL;
+	if (stat(pwd, &s_pwd) == -1 || stat(".", &s_dot) == -1)
+		return NULL;
+	if (s_pwd.st_dev != s_dot.st_dev || s_pwd.st_ino != s_dot.st_ino)
+		return NULL;
+	return pwd;
+}
+
+static void
+usage(void)
+{
+	(void)fprintf(stderr, "usage: %s [-LP]\n", getprogname());
+	exit(EXIT_FAILURE);
+	/* NOTREACHED */
+}