1 /*- 2 * Copyright (c) 2006,2008 Joseph Koshy 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 29 #include <ar.h> 30 #include <assert.h> 31 #include <libelf.h> 32 33 #include "_libelf.h" 34 35 ELFTC_VCSID("$Id: elf_next.c 2989 2014-03-17 09:56:46Z jkoshy $"); 36 37 Elf_Cmd 38 elf_next(Elf *e) 39 { 40 off_t next; 41 Elf *parent; 42 43 if (e == NULL) 44 return (ELF_C_NULL); 45 46 if ((parent = e->e_parent) == NULL) { 47 LIBELF_SET_ERROR(ARGUMENT, 0); 48 return (ELF_C_NULL); 49 } 50 51 assert(parent->e_kind == ELF_K_AR); 52 assert(parent->e_cmd == ELF_C_READ); 53 assert(e->e_rawfile > parent->e_rawfile); 54 55 next = e->e_rawfile - parent->e_rawfile + (off_t) e->e_rawsize; 56 next = (next + 1) & ~1; /* round up to an even boundary */ 57 58 /* 59 * Setup the 'e_next' field of the archive descriptor for the 60 * next call to 'elf_begin()'. 61 */ 62 parent->e_u.e_ar.e_next = (next >= (off_t) parent->e_rawsize) ? 63 (off_t) 0 : next; 64 65 return (ELF_C_READ); 66 } 67