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Annotation of src/usr.bin/lex/scanflags.c, Revision 1.1

1.1     ! tedu        1: /* $OpenBSD$ */
        !             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)
        !            45:         _sf_stk = (scanflags_t*) flex_realloc ( (void*) _sf_stk, sizeof(scanflags_t) * (_sf_max += 32));
        !            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_stk = (scanflags_t*) flex_alloc ( sizeof(scanflags_t) * (_sf_max = 32));
        !            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: }
        !            70:
        !            71: /* vim:set expandtab cindent tabstop=4 softtabstop=4 shiftwidth=4 textwidth=0: */