1/* scanflags - flags used by scanning. */
2
3/*  Copyright (c) 1990 The Regents of the University of California. */
4/*  All rights reserved. */
5
6/*  This code is derived from software contributed to Berkeley by */
7/*  Vern Paxson. */
8
9/*  The United States Government has rights in this work pursuant */
10/*  to contract no. DE-AC03-76SF00098 between the United States */
11/*  Department of Energy and the University of California. */
12
13/*  This file is part of flex. */
14
15/*  Redistribution and use in source and binary forms, with or without */
16/*  modification, are permitted provided that the following conditions */
17/*  are met: */
18
19/*  1. Redistributions of source code must retain the above copyright */
20/*     notice, this list of conditions and the following disclaimer. */
21/*  2. Redistributions in binary form must reproduce the above copyright */
22/*     notice, this list of conditions and the following disclaimer in the */
23/*     documentation and/or other materials provided with the distribution. */
24
25/*  Neither the name of the University nor the names of its contributors */
26/*  may be used to endorse or promote products derived from this software */
27/*  without specific prior written permission. */
28
29/*  THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR */
30/*  IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */
31/*  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
32/*  PURPOSE. */
33
34#include "flexdef.h"
35
36scanflags_t* _sf_stk = NULL;
37size_t _sf_top_ix=0, _sf_max=0;
38
39void
40sf_push (void)
41{
42    if (_sf_top_ix + 1 >= _sf_max)
43        _sf_stk = (scanflags_t*) flex_realloc ( (void*) _sf_stk, sizeof(scanflags_t) * (_sf_max += 32));
44
45    // copy the top element
46    _sf_stk[_sf_top_ix + 1] = _sf_stk[_sf_top_ix];
47    ++_sf_top_ix;
48}
49
50void
51sf_pop (void)
52{
53    assert(_sf_top_ix > 0);
54    --_sf_top_ix;
55}
56
57/* one-time initialization. Should be called before any sf_ functions. */
58void
59sf_init (void)
60{
61    assert(_sf_stk == NULL);
62    _sf_stk = (scanflags_t*) flex_alloc ( sizeof(scanflags_t) * (_sf_max = 32));
63    if (!_sf_stk)
64        lerrsf_fatal(_("Unable to allocate %ld of stack"),
65            (void *)(uintptr_t)sizeof(scanflags_t));
66    _sf_stk[_sf_top_ix] = 0;
67}
68
69/* vim:set expandtab cindent tabstop=4 softtabstop=4 shiftwidth=4 textwidth=0: */
70