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
36 scanflags_t* _sf_stk = NULL;
37 size_t _sf_top_ix=0, _sf_max=0;
38
39 void
sf_push(void)40 sf_push (void)
41 {
42 if (_sf_top_ix + 1 >= _sf_max) {
43 _sf_max += 32;
44 _sf_stk = realloc(_sf_stk, sizeof(scanflags_t) * _sf_max);
45 }
46
47 // copy the top element
48 _sf_stk[_sf_top_ix + 1] = _sf_stk[_sf_top_ix];
49 ++_sf_top_ix;
50 }
51
52 void
sf_pop(void)53 sf_pop (void)
54 {
55 assert(_sf_top_ix > 0);
56 --_sf_top_ix;
57 }
58
59 /* one-time initialization. Should be called before any sf_ functions. */
60 void
sf_init(void)61 sf_init (void)
62 {
63 assert(_sf_stk == NULL);
64 _sf_max = 32;
65 _sf_stk = malloc(sizeof(scanflags_t) * _sf_max);
66 if (!_sf_stk)
67 lerr_fatal(_("Unable to allocate %zu of stack"), sizeof(scanflags_t));
68 _sf_stk[_sf_top_ix] = 0;
69 }
70
71 /* vim:set expandtab cindent tabstop=4 softtabstop=4 shiftwidth=4 textwidth=0: */
72