1 /*- 2 * Copyright (c) 2016 Kai Wang 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/param.h> 28 #include <assert.h> 29 #include <errno.h> 30 #include <string.h> 31 #include <unistd.h> 32 33 #include "_libpe.h" 34 35 ELFTC_VCSID("$Id: libpe_utils.c 3312 2016-01-10 09:23:51Z kaiwang27 $"); 36 37 off_t 38 libpe_align(PE *pe, off_t off, size_t align) 39 { 40 off_t n; 41 42 assert(align > 0 && (align & (align - 1)) == 0); 43 44 n = roundup(off, align); 45 if (n > off) { 46 if (libpe_pad(pe, n - off) < 0) 47 return (-1); 48 } 49 50 return (n); 51 } 52 53 int 54 libpe_pad(PE *pe, size_t pad) 55 { 56 char tmp[128]; 57 size_t s; 58 59 memset(tmp, 0, sizeof(tmp)); 60 for (; pad > 0; pad -= s) { 61 s = pad > sizeof(tmp) ? sizeof(tmp) : pad; 62 if (write(pe->pe_fd, tmp, s) != (ssize_t) s) { 63 errno = EIO; 64 return (-1); 65 } 66 } 67 68 return (0); 69 } 70