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_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 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 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