1 /* $NetBSD: scanflags.c,v 1.3 2017/01/02 17:45:27 christos Exp $ */
2
3 /* scanflags - flags used by scanning. */
4
5 /* Copyright (c) 1990 The Regents of the University of California. */
6 /* All rights reserved. */
7
8 /* This code is derived from software contributed to Berkeley by */
9 /* Vern Paxson. */
10
11 /* The United States Government has rights in this work pursuant */
12 /* to contract no. DE-AC03-76SF00098 between the United States */
13 /* Department of Energy and the University of California. */
14
15 /* This file is part of flex. */
16
17 /* Redistribution and use in source and binary forms, with or without */
18 /* modification, are permitted provided that the following conditions */
19 /* are met: */
20
21 /* 1. Redistributions of source code must retain the above copyright */
22 /* notice, this list of conditions and the following disclaimer. */
23 /* 2. Redistributions in binary form must reproduce the above copyright */
24 /* notice, this list of conditions and the following disclaimer in the */
25 /* documentation and/or other materials provided with the distribution. */
26
27 /* Neither the name of the University nor the names of its contributors */
28 /* may be used to endorse or promote products derived from this software */
29 /* without specific prior written permission. */
30
31 /* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR */
32 /* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED */
33 /* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
34 /* PURPOSE. */
35 #include "flexdef.h"
36 __RCSID("$NetBSD: scanflags.c,v 1.3 2017/01/02 17:45:27 christos Exp $");
37
38 scanflags_t* _sf_stk = NULL;
39 size_t _sf_top_ix=0, _sf_max=0;
40
41 void
sf_push(void)42 sf_push (void)
43 {
44 if (_sf_top_ix + 1 >= _sf_max) {
45 _sf_max += 32;
46 _sf_stk = realloc(_sf_stk, sizeof(scanflags_t) * _sf_max);
47 }
48
49 // copy the top element
50 _sf_stk[_sf_top_ix + 1] = _sf_stk[_sf_top_ix];
51 ++_sf_top_ix;
52 }
53
54 void
sf_pop(void)55 sf_pop (void)
56 {
57 assert(_sf_top_ix > 0);
58 --_sf_top_ix;
59 }
60
61 /* one-time initialization. Should be called before any sf_ functions. */
62 void
sf_init(void)63 sf_init (void)
64 {
65 assert(_sf_stk == NULL);
66 _sf_max = 32;
67 _sf_stk = malloc(sizeof(scanflags_t) * _sf_max);
68 if (!_sf_stk)
69 lerr_fatal(_("Unable to allocate %zu of stack"), sizeof(scanflags_t));
70 _sf_stk[_sf_top_ix] = 0;
71 }
72
73 /* vim:set expandtab cindent tabstop=4 softtabstop=4 shiftwidth=4 textwidth=0: */
74