1 files changed, 123 insertions, 0 deletions
diff --git a/bin/pwd/pwd.c b/bin/pwd/pwd.c
new file mode 100644
index 0000000..4baf3aa
--- /dev/null
+++ b/bin/pwd/pwd.c
@@ -0,0 +1,123 @@
+/*-
+ * 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.
+ * 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 0
+#ifndef lint
+static char const copyright[] =
+"@(#) Copyright (c) 1991, 1993, 1994\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)pwd.c	8.3 (Berkeley) 4/1/94";
+#endif /* not lint */
+#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <err.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static char *getcwd_logical(void);
+void usage(void);
+
+int
+main(int argc, char *argv[])
+{
+	int physical;
+	int ch;
+	char *p;
+
+	physical = 1;
+	while ((ch = getopt(argc, argv, "LP")) != -1)
+		switch (ch) {
+		case 'L':
+			physical = 0;
+			break;
+		case 'P':
+			physical = 1;
+			break;
+		case '?':
+		default:
+			usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	if (argc != 0)
+		usage();
+
+	/*
+	 * If we're trying to find the logical current directory and that
+	 * fails, behave as if -P was specified.
+	 */
+	if ((!physical && (p = getcwd_logical()) != NULL) ||
+	    (p = getcwd(NULL, 0)) != NULL)
+		printf("%s\n", p);
+	else
+		err(1, ".");
+
+	exit(0);
+}
+
+void
+usage(void)
+{
+
+	(void)fprintf(stderr, "usage: pwd [-L | -P]\n");
+  	exit(1);
+}
+
+static char *
+getcwd_logical(void)
+{
+	struct stat lg, phy;
+	char *pwd;
+
+	/*
+	 * Check that $PWD is an absolute logical pathname referring to
+	 * the current working directory.
+	 */
+	if ((pwd = getenv("PWD")) != NULL && *pwd == '/') {
+		if (stat(pwd, &lg) == -1 || stat(".", &phy) == -1)
+			return (NULL);
+		if (lg.st_dev == phy.st_dev && lg.st_ino == phy.st_ino)
+			return (pwd);
+	}
+
+	errno = ENOENT;
+	return (NULL);
+}