1 | /*- |
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2 | * Copyright (c) 2006,2008 Joseph Koshy |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * |
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14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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24 | * SUCH DAMAGE. |
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25 | */ |
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26 | |
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27 | #include <sys/cdefs.h> |
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28 | |
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29 | #include <ar.h> |
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30 | #include <assert.h> |
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31 | #include <libelf.h> |
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32 | |
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33 | #include "_libelf.h" |
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34 | |
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35 | LIBELF_VCSID("$Id: elf_next.c 1678 2011-07-28 04:36:34Z jkoshy $"); |
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36 | |
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37 | Elf_Cmd |
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38 | elf_next(Elf *e) |
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39 | { |
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40 | off_t next; |
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41 | Elf *parent; |
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42 | |
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43 | if (e == NULL) |
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44 | return (ELF_C_NULL); |
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45 | |
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46 | if ((parent = e->e_parent) == NULL) { |
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47 | LIBELF_SET_ERROR(ARGUMENT, 0); |
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48 | return (ELF_C_NULL); |
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49 | } |
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50 | |
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51 | assert (parent->e_kind == ELF_K_AR); |
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52 | assert (parent->e_cmd == ELF_C_READ); |
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53 | assert(e->e_rawfile > parent->e_rawfile); |
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54 | |
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55 | next = e->e_rawfile - parent->e_rawfile + e->e_rawsize; |
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56 | next = (next + 1) & ~1; /* round up to an even boundary */ |
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57 | |
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58 | parent->e_u.e_ar.e_next = (next >= (off_t) parent->e_rawsize) ? |
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59 | (off_t) 0 : next; |
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60 | |
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61 | return (ELF_C_READ); |
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62 | } |
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