/*
* Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
/*
* Copyright (c) 1990, 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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
#include
/*
* Perform a binary search.
*
* The code below is a bit sneaky. After a comparison fails, we
* divide the work in half by moving either left or right. If lim
* is odd, moving left simply involves halving lim: e.g., when lim
* is 5 we look at item 2, so we change lim to 2 so that we will
* look at items 0 & 1. If lim is even, the same applies. If lim
* is odd, moving right again involes halving lim, this time moving
* the base up one item past p: e.g., when lim is 5 we change base
* to item 3 and make lim 2 so that we will look at items 3 and 4.
* If lim is even, however, we have to shrink it by one before
* halving: e.g., when lim is 4, we still looked at item 2, so we
* have to make lim 3, then halve, obtaining 1, so that we will only
* look at item 3.
*/
#ifdef notdef
void *
bsearch(key, base0, nmemb, size, compar)
register const void *key;
const void *base0;
size_t nmemb;
register size_t size;
register int (*compar) __P((const void *, const void *));
{
register const char *base = base0;
register size_t lim;
register int cmp;
register const void *p;
for (lim = nmemb; lim != 0; lim >>= 1) {
p = base + (lim >> 1) * size;
cmp = (*compar)(key, p);
if (cmp == 0)
return ((void *)p);
if (cmp > 0) { /* key > p: move right */
base = (char *)p + size;
lim--;
} /* else move left */
}
return (NULL);
}
#endif /* notdef */
#include
#include
static
inline
struct nlist *
inline_bsearch_nlist(
register const void *key,
/* const void *base0 */
const struct nlist *base0,
size_t nmemb)
/* register size_t size; */
/* size -> sizeof(struct nlist) */
/* register int (*compar) __P((const void *, const void *)); */
/* compar -> nlist_bsearch -> strcmp using nlist_bsearch_strings as a base to
the string table */
{
register const struct nlist *base = base0;
register size_t lim;
register int cmp;
register const struct nlist *p;
for (lim = nmemb; lim != 0; lim >>= 1) {
/* p = base + (lim >> 1) * sizeof(struct nlist); */
p = base + (lim >> 1);
cmp = strcmp(key, nlist_bsearch_strings + p->n_un.n_strx);
if (cmp == 0)
return ((void *)p);
if (cmp > 0) { /* key > p: move right */
/* base = (char *)p + sizeof(struct nlist); */
base = p + 1;
lim--;
} /* else move left */
}
return(NULL);
}
static
inline
struct dylib_table_of_contents *
inline_bsearch_toc(
register const void *key,
/* const void *base0 */
const struct dylib_table_of_contents *base0,
size_t nmemb)
/* register size_t size; */
/* size -> sizeof(struct dylib_table_of_contents) */
/* register int (*compar) __P((const void *, const void *)); */
/* compar -> nlist_bsearch -> strcmp using
toc_bsearch_symbols as a base for the symbols
and nlist_bsearch_strings as a base to the string table */
{
register const struct dylib_table_of_contents *base = base0;
register size_t lim;
register int cmp;
register const struct dylib_table_of_contents *p;
for (lim = nmemb; lim != 0; lim >>= 1) {
/* p = base + (lim >> 1) * sizeof(struct dylib_table_of_contents); */
p = base + (lim >> 1);
cmp = strcmp(key, toc_bsearch_strings +
toc_bsearch_symbols[p->symbol_index].n_un.n_strx);
if (cmp == 0)
return ((void *)p);
if (cmp > 0) { /* key > p: move right */
/* base = (char *)p + sizeof(struct dylib_table_of_contents); */
base = p + 1;
lim--;
} /* else move left */
}
return(NULL);
}
/*
* inline_bsearch_toc_with_index() searches for symbol_name in the specified
* tocs (table of contents) with ntocs number of entries. If starting_index is
* less then the number of entries then that is used as the start of the search.
* the symbol table for the table of contents is pointed to by
* toc_bsearch_symbols and the string table is pointed to by
* toc_bsearch_strings. If a table of contents entry for the symbol is found
* a pointer to it is returned. Else NULL is returned.
*/
static
inline
struct dylib_table_of_contents *
inline_bsearch_toc_with_index(
char *symbol_name,
struct dylib_table_of_contents *tocs,
unsigned long ntocs,
unsigned long starting_index)
{
long low, high, mid;
int cmp;
low = 0;
high = ntocs - 1;
if(starting_index >= ntocs)
mid = (low + high) / 2;
else
mid = starting_index;
while(low <= high){
cmp = strcmp(symbol_name, toc_bsearch_strings +
toc_bsearch_symbols[tocs[mid].symbol_index].n_un.n_strx);
if(cmp == 0)
return(tocs + mid);
if(cmp > 0){ /* symbol_name > tocs[mid] move right */
low = mid + 1;
}
else{ /* else move left */
high = mid - 1;
}
mid = (low + high) / 2;
}
return(NULL);
}