From e62ae31192a7528f178d2a6ee38b065d459b33c7 Mon Sep 17 00:00:00 2001
From: Christopher Faylor <me@cgf.cx>
Date: Tue, 10 Oct 2000 19:24:32 +0000
Subject: [PATCH] * path.cc (cwdstuff::get): Set EINVAL when length is zero.

---
 winsup/cygwin/ChangeLog |  4 ++++
 winsup/cygwin/path.cc   | 15 ++++++++++++---
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index c6315d32e..140984e46 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,7 @@
+Tue Oct 10 15:21:10 2000  Christopher Faylor <cgf@cygnus.com>
+
+	* path.cc (cwdstuff::get): Set EINVAL when length is zero.
+
 Mon Oct  9 14:07:04 2000  Christopher Faylor <cgf@cygnus.com>
 
 	* path.cc (mount_info::cygdrive_posix_path): Handle e:foo construction
diff --git a/winsup/cygwin/path.cc b/winsup/cygwin/path.cc
index cc339973c..3b8ff7d56 100644
--- a/winsup/cygwin/path.cc
+++ b/winsup/cygwin/path.cc
@@ -2937,6 +2937,13 @@ char *
 cwdstuff::get (char *buf, int need_posix, int with_chroot, unsigned ulen)
 {
   MALLOC_CHECK;
+
+  if (ulen == 0)
+    {
+      set_errno (EINVAL);
+      goto out;
+    }
+
   if (!get_initial ())	/* Get initial cwd and set cwd lock */
     return NULL;
 
@@ -2955,7 +2962,7 @@ cwdstuff::get (char *buf, int need_posix, int with_chroot, unsigned ulen)
     }
   else
     {
-      if (need_posix && !buf)
+      if (!buf)
 	buf = (char *) malloc (strlen (tocopy) + 1);
       strcpy (buf, tocopy);
       if (!buf[0])	/* Should only happen when chroot */
@@ -2963,8 +2970,10 @@ cwdstuff::get (char *buf, int need_posix, int with_chroot, unsigned ulen)
     }
 
   lock->release ();
-  syscall_printf ("(%s) = cwdstuff::get (%p, %d, %d, %d)",
-		  buf, buf, ulen, need_posix, with_chroot);
+
+out:
+  syscall_printf ("(%s) = cwdstuff::get (%p, %d, %d, %d), errno %d",
+		  buf, buf, ulen, need_posix, with_chroot, errno);
   MALLOC_CHECK;
   return buf;
 }