From 2b88597a04aefb8275f44a2091bcd2285afc665d Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 17 Nov 2004 03:41:16 +0000
Subject: Include <limits.h>, for PATH_MAX. (xgetcwd): Set errno correctly when
 failing. Work around Solaris 9 bug: getcwd sets errno==ERANGE even though the
 failure is actually due to a PATH_MAX problem.

---
 lib/xgetcwd.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

(limited to 'lib/xgetcwd.c')

diff --git a/lib/xgetcwd.c b/lib/xgetcwd.c
index 785002e0e..f08580357 100644
--- a/lib/xgetcwd.c
+++ b/lib/xgetcwd.c
@@ -23,6 +23,7 @@
 # include <config.h>
 #endif
 
+#include <limits.h>
 #include <stdio.h>
 #include <errno.h>
 #include <sys/types.h>
@@ -60,6 +61,8 @@ xgetcwd (void)
   return cwd;
 #else
 
+  int saved_errno;
+
   /* The initial buffer size for the working directory.  A power of 2
      detects arithmetic overflow earlier, but is not required.  */
 # ifndef INITIAL_BUFFER_SIZE
@@ -72,16 +75,29 @@ xgetcwd (void)
     {
       char *buf = xmalloc (buf_size);
       char *cwd = getcwd (buf, buf_size);
-      int saved_errno;
       if (cwd)
 	return cwd;
       saved_errno = errno;
       free (buf);
       if (saved_errno != ERANGE)
-	return NULL;
+	break;
+
+#ifdef PATH_MAX
+      if (PATH_MAX / 2 < buf_size)
+	{
+	  if (PATH_MAX <= buf_size)
+	    break;
+	  buf_size = PATH_MAX;
+	  continue;
+	}
+#endif
+
       buf_size *= 2;
       if (buf_size == 0)
 	xalloc_die ();
     }
+
+  errno = saved_errno;
+  return NULL;
 #endif
 }
-- 
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