12de3b87aSKai Wang /*- 22de3b87aSKai Wang * Copyright (c) 2006,2008 Joseph Koshy 32de3b87aSKai Wang * All rights reserved. 42de3b87aSKai Wang * 52de3b87aSKai Wang * Redistribution and use in source and binary forms, with or without 62de3b87aSKai Wang * modification, are permitted provided that the following conditions 72de3b87aSKai Wang * are met: 82de3b87aSKai Wang * 1. Redistributions of source code must retain the above copyright 92de3b87aSKai Wang * notice, this list of conditions and the following disclaimer. 102de3b87aSKai Wang * 2. Redistributions in binary form must reproduce the above copyright 112de3b87aSKai Wang * notice, this list of conditions and the following disclaimer in the 122de3b87aSKai Wang * documentation and/or other materials provided with the distribution. 132de3b87aSKai Wang * 142de3b87aSKai Wang * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 152de3b87aSKai Wang * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 162de3b87aSKai Wang * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 172de3b87aSKai Wang * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 182de3b87aSKai Wang * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 192de3b87aSKai Wang * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 202de3b87aSKai Wang * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 212de3b87aSKai Wang * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 222de3b87aSKai Wang * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 232de3b87aSKai Wang * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 242de3b87aSKai Wang * SUCH DAMAGE. 252de3b87aSKai Wang */ 262de3b87aSKai Wang 272de3b87aSKai Wang #include <sys/cdefs.h> 282de3b87aSKai Wang 292de3b87aSKai Wang #include <ar.h> 302de3b87aSKai Wang #include <assert.h> 312de3b87aSKai Wang #include <libelf.h> 322de3b87aSKai Wang 332de3b87aSKai Wang #include "_libelf.h" 342de3b87aSKai Wang 35*cf781b2eSEd Maste ELFTC_VCSID("$Id: elf_next.c 2989 2014-03-17 09:56:46Z jkoshy $"); 362de3b87aSKai Wang 372de3b87aSKai Wang Elf_Cmd 382de3b87aSKai Wang elf_next(Elf *e) 392de3b87aSKai Wang { 402de3b87aSKai Wang off_t next; 412de3b87aSKai Wang Elf *parent; 422de3b87aSKai Wang 432de3b87aSKai Wang if (e == NULL) 442de3b87aSKai Wang return (ELF_C_NULL); 452de3b87aSKai Wang 462de3b87aSKai Wang if ((parent = e->e_parent) == NULL) { 472de3b87aSKai Wang LIBELF_SET_ERROR(ARGUMENT, 0); 482de3b87aSKai Wang return (ELF_C_NULL); 492de3b87aSKai Wang } 502de3b87aSKai Wang 512de3b87aSKai Wang assert(parent->e_kind == ELF_K_AR); 522de3b87aSKai Wang assert(parent->e_cmd == ELF_C_READ); 532de3b87aSKai Wang assert(e->e_rawfile > parent->e_rawfile); 542de3b87aSKai Wang 55*cf781b2eSEd Maste next = e->e_rawfile - parent->e_rawfile + (off_t) e->e_rawsize; 562de3b87aSKai Wang next = (next + 1) & ~1; /* round up to an even boundary */ 572de3b87aSKai Wang 58*cf781b2eSEd Maste /* 59*cf781b2eSEd Maste * Setup the 'e_next' field of the archive descriptor for the 60*cf781b2eSEd Maste * next call to 'elf_begin()'. 61*cf781b2eSEd Maste */ 622de3b87aSKai Wang parent->e_u.e_ar.e_next = (next >= (off_t) parent->e_rawsize) ? 632de3b87aSKai Wang (off_t) 0 : next; 642de3b87aSKai Wang 652de3b87aSKai Wang return (ELF_C_READ); 662de3b87aSKai Wang } 67