1 files changed, 83 insertions, 0 deletions
diff --git a/tools/build/src/engine/cwd.c b/tools/build/src/engine/cwd.c
new file mode 100644
index 000000000..7ebe97045
--- /dev/null
+++ b/tools/build/src/engine/cwd.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright 2002. Vladimir Prus
+ * Copyright 2005. Rene Rivera
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ */
+
+#include "cwd.h"
+
+#include "jam.h"
+#include "mem.h"
+#include "pathsys.h"
+
+#include <assert.h>
+#include <errno.h>
+#include <limits.h>
+
+/* MinGW on Windows declares PATH_MAX in limits.h */
+#if defined( NT ) && !defined( __GNUC__ )
+# include <direct.h>
+# define PATH_MAX _MAX_PATH
+#else
+# include <unistd.h>
+# if defined( __COMO__ )
+#  include <linux/limits.h>
+# endif
+#endif
+
+#ifndef PATH_MAX
+# define PATH_MAX 1024
+#endif
+
+
+static OBJECT * cwd_;
+
+
+void cwd_init( void )
+{
+    int buffer_size = PATH_MAX;
+    char * cwd_buffer = 0;
+    int error;
+
+    assert( !cwd_ );
+
+    do
+    {
+        char * const buffer = BJAM_MALLOC_RAW( buffer_size );
+        cwd_buffer = getcwd( buffer, buffer_size );
+        error = errno;
+        if ( cwd_buffer )
+        {
+            /* We store the path using its canonical/long/key format. */
+            OBJECT * const cwd = object_new( cwd_buffer );
+            cwd_ = path_as_key( cwd );
+            object_free( cwd );
+        }
+        buffer_size *= 2;
+        BJAM_FREE_RAW( buffer );
+    }
+    while ( !cwd_ && error == ERANGE );
+
+    if ( !cwd_ )
+    {
+        perror( "can not get current working directory" );
+        exit( EXITBAD );
+    }
+}
+
+
+OBJECT * cwd( void )
+{
+    assert( cwd_ );
+    return cwd_;
+}
+
+
+void cwd_done( void )
+{
+    assert( cwd_ );
+    object_free( cwd_ );
+    cwd_ = NULL;
+}