From ae8f68c4a7c2f557bbb94bc357693d44edbb57dd Mon Sep 17 00:00:00 2001
From: deraadt <deraadt@openbsd.org>
Date: Wed, 22 Nov 1995 10:32:52 +0000
Subject: [PATCH] handle "cd -" causing crash if used as first sh command; from
 scottr@Plexus.COM; netbsd pr#1760

---
 bin/sh/cd.c   | 39 ++++-----------------------------------
 bin/sh/main.c |  2 ++
 2 files changed, 6 insertions(+), 35 deletions(-)

diff --git a/bin/sh/cd.c b/bin/sh/cd.c
index f11b9ad4d10..c8a13573fc8 100644
--- a/bin/sh/cd.c
+++ b/bin/sh/cd.c
@@ -328,10 +328,8 @@ pwdcmd(argc, argv)
 
 
 /*
- * Run /bin/pwd to find out what the current directory is.  We suppress
- * interrupts throughout most of this, but the user can still break out
- * of it by killing the pwd program.  If we already know the current
- * directory, this routine returns immediately.
+ * If we already know the current directory, this routine returns
+ * immediately.
  */
 
 #define MAXPWD 256
@@ -347,36 +345,7 @@ getpwd() {
 
 	if (curdir)
 		return;
-	INTOFF;
-	if (pipe(pip) < 0)
-		error("Pipe call failed");
-	jp = makejob((union node *)NULL, 1);
-	if (forkshell(jp, (union node *)NULL, FORK_NOJOB) == 0) {
-		close(pip[0]);
-		if (pip[1] != 1) {
-			close(1);
-			copyfd(pip[1], 1);
-			close(pip[1]);
-		}
-		execl("/bin/pwd", "pwd", (char *)0);
-		error("Cannot exec /bin/pwd");
-	}
-	close(pip[1]);
-	pip[1] = -1;
-	p = buf;
-	while ((i = read(pip[0], p, buf + MAXPWD - p)) > 0
-	     || (i == -1 && errno == EINTR)) {
-		if (i > 0)
-			p += i;
-	}
-	close(pip[0]);
-	pip[0] = -1;
-	status = waitforjob(jp);
-	if (status != 0)
-		error((char *)0);
-	if (i < 0 || p == buf || p[-1] != '\n')
-		error("pwd command failed");
-	p[-1] = '\0';
+	if (getcwd(buf, sizeof(buf)) == NULL)
+		error("getcwd() failed");
 	curdir = savestr(buf);
-	INTON;
 }
diff --git a/bin/sh/main.c b/bin/sh/main.c
index caa4bdf99de..f11a9a60897 100644
--- a/bin/sh/main.c
+++ b/bin/sh/main.c
@@ -91,6 +91,7 @@ extern int etext();
 
 STATIC void read_profile __P((char *));
 STATIC char *find_dot_file __P((char *));
+STATIC void getpwd __P((void));
 
 /*
  * Main routine.  We initialize things, parse the arguments, execute
@@ -159,6 +160,7 @@ main(argc, argv)
 	init();
 	setstackmark(&smark);
 	procargs(argc, argv);
+	getpwd();
 	if (argv[0] && argv[0][0] == '-') {
 		state = 1;
 		read_profile("/etc/profile");
-- 
2.20.1