83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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#include "symtab.h"
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#include "loader/symbols.h"
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#include <string.h>
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/* Binary search is twice as large but still small. */
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#ifndef SYMTAB_CONF_BINARY_SEARCH
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#define SYMTAB_CONF_BINARY_SEARCH 1
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#endif
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/*---------------------------------------------------------------------------*/
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#if SYMTAB_CONF_BINARY_SEARCH
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void *
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symtab_lookup(const char *name)
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{
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int start, middle, end;
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int r;
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start = 0;
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end = symbols_nelts - 1; /* Last entry is { 0, 0 }. */
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while(start <= end) {
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/* Check middle, divide */
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middle = (start + end) / 2;
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r = strcmp(name, symbols[middle].name);
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if(r < 0) {
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end = middle - 1;
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} else if(r > 0) {
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start = middle + 1;
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} else {
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return symbols[middle].value;
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}
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}
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return NULL;
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}
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#else /* SYMTAB_CONF_BINARY_SEARCH */
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void *
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symtab_lookup(const char *name)
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{
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const struct symbols *s;
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for(s = symbols; s->name != NULL; ++s) {
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if(strcmp(name, s->name) == 0) {
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return s->value;
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}
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}
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return 0;
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}
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#endif /* SYMTAB_CONF_BINARY_SEARCH */
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/*---------------------------------------------------------------------------*/
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