1 files changed, 70 insertions, 0 deletions
diff --git a/src/scanflags.c b/src/scanflags.c
new file mode 100644
index 0000000..aa3de8a
--- /dev/null
+++ b/src/scanflags.c
@@ -0,0 +1,70 @@
+/* scanflags - flags used by scanning. */
+
+/*  Copyright (c) 1990 The Regents of the University of California. */
+/*  All rights reserved. */
+
+/*  This code is derived from software contributed to Berkeley by */
+/*  Vern Paxson. */
+
+/*  The United States Government has rights in this work pursuant */
+/*  to contract no. DE-AC03-76SF00098 between the United States */
+/*  Department of Energy and the University of California. */
+
+/*  This file is part of flex. */
+
+/*  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. */
+
+/*  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 ``AS IS'' AND WITHOUT ANY EXPRESS OR */
+/*  IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */
+/*  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
+/*  PURPOSE. */
+
+#include "flexdef.h"
+
+scanflags_t* _sf_stk = NULL;
+size_t _sf_top_ix=0, _sf_max=0;
+
+void
+sf_push (void)
+{
+    if (_sf_top_ix + 1 >= _sf_max)
+        _sf_max += 32;
+        _sf_stk = realloc(_sf_stk, sizeof(scanflags_t) * _sf_max);
+
+    // copy the top element
+    _sf_stk[_sf_top_ix + 1] = _sf_stk[_sf_top_ix];
+    ++_sf_top_ix;
+}
+
+void
+sf_pop (void)
+{
+    assert(_sf_top_ix > 0);
+    --_sf_top_ix;
+}
+
+/* one-time initialization. Should be called before any sf_ functions. */
+void
+sf_init (void)
+{
+    assert(_sf_stk == NULL);
+    _sf_max = 32;
+    _sf_stk = malloc(sizeof(scanflags_t) * _sf_max);
+    if (!_sf_stk)
+        lerr_fatal(_("Unable to allocate %zu of stack"), sizeof(scanflags_t));
+    _sf_stk[_sf_top_ix] = 0;
+}
+
+/* vim:set expandtab cindent tabstop=4 softtabstop=4 shiftwidth=4 textwidth=0: */