/* * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * 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 <stddef.h> #include <stdlib.h> /* * 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 <mach-o/loader.h> #include <mach-o/nlist.h> #include <string.h> 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); }