scanflags.c revision 1.3
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 38scanflags_t* _sf_stk = NULL; 39size_t _sf_top_ix=0, _sf_max=0; 40 41void 42sf_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 54void 55sf_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. */ 62void 63sf_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