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Annotation of src/usr.bin/lex/scanflags.c, Revision 1.3

1.3     ! tedu        1: /* $OpenBSD: scanflags.c,v 1.2 2015/11/19 22:16:43 tedu Exp $ */
1.1       tedu        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:
                     36: #include "flexdef.h"
                     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)
1.3     ! tedu       45:         _sf_stk = (scanflags_t*) realloc ( (void*) _sf_stk, sizeof(scanflags_t) * (_sf_max += 32));
1.1       tedu       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);
1.3     ! tedu       64:     _sf_stk = (scanflags_t*) malloc ( sizeof(scanflags_t) * (_sf_max = 32));
1.1       tedu       65:     if (!_sf_stk)
                     66:         lerrsf_fatal(_("Unable to allocate %ld of stack"),
                     67:             (void *)sizeof(scanflags_t));
                     68:     _sf_stk[_sf_top_ix] = 0;
                     69: }