b5d4a01821
Gregory Nutt has submitted the SGA and we can migrate the licenses to Apache. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
90 lines
3.1 KiB
C
90 lines
3.1 KiB
C
/****************************************************************************
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* libs/libc/symtab/symtab_findbyvalue.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stddef.h>
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#include <debug.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/symtab.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: symtab_findbyvalue
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*
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* Description:
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* Find the symbol in the symbol table whose value closest (but not greater
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* than), the provided value. This version assumes that table is not ordered
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* with respect to symbol name and, hence, access time will be linear with
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* respect to nsyms.
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*
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* Returned Value:
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* A reference to the symbol table entry if an entry with the matching
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* name is found; NULL is returned if the entry is not found.
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*
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****************************************************************************/
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FAR const struct symtab_s *
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symtab_findbyvalue(FAR const struct symtab_s *symtab,
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FAR void *value, int nsyms)
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{
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FAR const struct symtab_s *retval = NULL;
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DEBUGASSERT(symtab != NULL);
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for (; nsyms > 0; symtab++, nsyms--)
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{
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/* Look for symbols of lesser or equal value (probably address) to value */
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if (symtab->sym_value <= value)
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{
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/* Found one. Is it the largest we have found so far? */
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if (!retval || symtab->sym_value > retval->sym_value)
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{
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/* Yes, then it is the new candidate for the symbol whose value
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* just below 'value'
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*/
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retval = symtab;
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/* If it is exactly equal to the search 'value', then we might as
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* well terminate early because we can't do any better than that.
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*/
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if (retval->sym_value == value)
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{
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break;
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}
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}
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}
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}
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return retval;
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}
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