contrib/flex/scanflags.c

   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
  40 sf_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
  50 void
  51 sf_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. */
  58 void
  59 sf_init (void)
  60 {
  61     char membytes[21];
  62     assert(_sf_stk == NULL);
  63     _sf_stk = (scanflags_t*) flex_alloc ( sizeof(scanflags_t) * (_sf_max = 32));
  64     if (!_sf_stk) {
  65         snprintf(membytes, 20, "%ld", (long)sizeof(scanflags_t));
  66         lerrsf_fatal(_("Unable to allocate %s of stack"), membytes);
  67     }
  68     _sf_stk[_sf_top_ix] = 0;
  69 }
  70
  71 /* vim:set expandtab cindent tabstop=4 softtabstop=4 shiftwidth=4 textwidth=0: */