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      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
     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
     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
     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