122 lines
4.6 KiB
C
122 lines
4.6 KiB
C
/****************************************************************************
|
|
* binfmt/symtab_findbyvalue.c
|
|
*
|
|
* Copyright (C) 2009 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stddef.h>
|
|
#include <debug.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
|
|
#include <nuttx/binfmt/symtab.h>
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Function Prototypes
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Data
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: symtab_findbyvalue
|
|
*
|
|
* Description:
|
|
* Find the symbol in the symbol table whose value closest (but not greater
|
|
* than), the provided value. This version assumes that table is not ordered
|
|
* with respect to symbol name and, hence, access time will be linear with
|
|
* respect to nsyms.
|
|
*
|
|
* Returned Value:
|
|
* A reference to the symbol table entry if an entry with the matching
|
|
* name is found; NULL is returned if the entry is not found.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR const struct symtab_s *
|
|
symtab_findbyvalue(FAR const struct symtab_s *symtab,
|
|
FAR void *value, int nsyms)
|
|
{
|
|
FAR const struct symtab_s *retval = NULL;
|
|
|
|
DEBUGASSERT(symtab != NULL);
|
|
for (; nsyms > 0; symtab++, nsyms--)
|
|
{
|
|
/* Look for symbols of lesser or equal value (probably address) to value */
|
|
|
|
if (symtab->sym_value <= value)
|
|
{
|
|
/* Found one. Is it the largest we have found so far? */
|
|
|
|
if (!retval || symtab->sym_value > retval->sym_value)
|
|
{
|
|
/* Yes, then it is the new candidate for the symbol whose value
|
|
* just below 'value'
|
|
*/
|
|
|
|
retval = symtab;
|
|
|
|
/* If it is exactly equal to the search 'value', then we might as
|
|
* well terminate early because we can't do any better than that.
|
|
*/
|
|
|
|
if (retval->sym_value == value)
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|