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/* $OpenBSD: lookup.c,v 1.8 2009/10/27 23:59:38 deraadt Exp $ */
/* $NetBSD: lookup.c,v 1.5 1995/04/19 07:16:06 cgd Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* 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 of the University 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 REGENTS 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 REGENTS 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.
*/
#include "gprof.h"
/*
* look up an address in a sorted-by-address namelist
* this deals with misses by mapping them to the next lower
* entry point.
*/
nltype *
nllookup(unsigned long address)
{
long low;
long middle;
long high;
# ifdef DEBUG
int probes;
probes = 0;
# endif /* DEBUG */
for ( low = 0 , high = nname - 1 ; low != high ; ) {
# ifdef DEBUG
probes += 1;
# endif /* DEBUG */
middle = ( high + low ) >> 1;
if ( nl[ middle ].value <= address && nl[ middle+1 ].value > address ) {
# ifdef DEBUG
if ( debug & LOOKUPDEBUG ) {
printf( "[nllookup] %d (%d) probes\n" , probes , nname-1 );
}
# endif /* DEBUG */
return &nl[ middle ];
}
if ( nl[ middle ].value > address ) {
high = middle;
} else {
low = middle + 1;
}
}
# ifdef DEBUG
if ( debug & LOOKUPDEBUG )
warnx("[nllookup] (%d) binary search fails", nname - 1);
# endif /* DEBUG */
return 0;
}
arctype *
arclookup(nltype *parentp, nltype *childp)
{
arctype *arcp;
if ( parentp == 0 || childp == 0 ) {
warnx("[arclookup] parentp == 0 || childp == 0");
return 0;
}
# ifdef DEBUG
if ( debug & LOOKUPDEBUG ) {
printf( "[arclookup] parent %s child %s\n" ,
parentp -> name , childp -> name );
}
# endif /* DEBUG */
for ( arcp = parentp -> children ; arcp ; arcp = arcp -> arc_childlist ) {
# ifdef DEBUG
if ( debug & LOOKUPDEBUG ) {
printf( "[arclookup]\t arc_parent %s arc_child %s\n" ,
arcp -> arc_parentp -> name ,
arcp -> arc_childp -> name );
}
# endif /* DEBUG */
if ( arcp -> arc_childp == childp ) {
return arcp;
}
}
return 0;
}
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