Resync new repository with old repo r5166

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3
2026-11-06 04:41:36 +08:00 · 2012-09-17 18:18:44 +00:00
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+/****************************************************************************
+ * 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/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;
+}
+