146 lines
3.5 KiB
C++
146 lines
3.5 KiB
C++
/*
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* Copyright (c) 2002-2003 Stephen Williams (steve@icarus.com)
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CVS_IDENT
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#ident "$Id: StringHeap.cc,v 1.5 2003/03/01 06:25:30 steve Exp $"
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#endif
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# include "StringHeap.h"
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#ifdef HAVE_MALLOC_H
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# include <malloc.h>
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#endif
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# include <stdlib.h>
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# include <string.h>
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# include <assert.h>
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StringHeap::StringHeap()
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{
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cell_base_ = 0;
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cell_ptr_ = HEAPCELL;
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cell_count_ = 0;
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}
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StringHeap::~StringHeap()
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{
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// This is a planned memory leak. The string heap is intended
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// to hold permanently-allocated strings.
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}
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const char* StringHeap::add(const char*text)
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{
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unsigned len = strlen(text);
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assert((len+1) <= HEAPCELL);
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unsigned rem = HEAPCELL - cell_ptr_;
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if (rem < (len+1)) {
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cell_base_ = (char*)malloc(HEAPCELL);
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cell_ptr_ = 0;
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cell_count_ += 1;
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assert(cell_base_ != 0);
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}
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char*res = cell_base_ + cell_ptr_;
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memcpy(res, text, len);
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cell_ptr_ += len;
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cell_base_[cell_ptr_++] = 0;
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assert(cell_ptr_ <= HEAPCELL);
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return res;
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}
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StringHeapLex::StringHeapLex()
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{
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hit_count_ = 0;
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add_count_ = 0;
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for (unsigned idx = 0 ; idx < HASH_SIZE ; idx += 1)
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hash_table_[idx] = 0;
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}
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StringHeapLex::~StringHeapLex()
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{
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}
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unsigned StringHeapLex::add_hit_count() const
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{
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return hit_count_;
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}
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unsigned StringHeapLex::add_count() const
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{
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return add_count_;
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}
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static unsigned hash_string(const char*text)
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{
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unsigned h = 0;
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while (*text) {
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h = (h << 4) ^ (h >> 28) ^ *text;
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text += 1;
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}
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return h;
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}
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const char* StringHeapLex::add(const char*text)
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{
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unsigned hash_value = hash_string(text) % HASH_SIZE;
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/* If we easily find the string in the hash table, then return
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that and be done. */
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if (hash_table_[hash_value]
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&& (strcmp(hash_table_[hash_value], text) == 0)) {
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hit_count_ += 1;
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return hash_table_[hash_value];
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}
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/* The existing hash entry is not a match. Replace it with the
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newly allocated value, and return the new pointer as the
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result to the add. */
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const char*res = StringHeap::add(text);
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hash_table_[hash_value] = res;
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add_count_ += 1;
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return res;
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}
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/*
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* $Log: StringHeap.cc,v $
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* Revision 1.5 2003/03/01 06:25:30 steve
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* Add the lex_strings string handler, and put
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* scope names and system task/function names
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* into this table. Also, permallocate event
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* names from the beginning.
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*
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* Revision 1.4 2003/01/27 05:09:17 steve
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* Spelling fixes.
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*
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* Revision 1.3 2003/01/16 21:44:46 steve
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* Keep some debugging status.
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*
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* Revision 1.2 2002/08/12 01:34:58 steve
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* conditional ident string using autoconfig.
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*
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* Revision 1.1 2002/08/04 19:13:16 steve
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* dll uses StringHeap for named items.
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*
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*/
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