1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Edward Sze-Tyan Wang. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 37 __FBSDID("$FreeBSD$"); 38 39 #ifndef lint 40 static const char sccsid[] = "@(#)misc.c 8.1 (Berkeley) 6/6/93"; 41 #endif 42 43 #include <sys/types.h> 44 #include <sys/stat.h> 45 #include <sys/mman.h> 46 47 #include <err.h> 48 #include <errno.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 #include <libcasper.h> 55 #include <casper/cap_fileargs.h> 56 57 #include "extern.h" 58 59 void 60 ierr(const char *fname) 61 { 62 warn("%s", fname); 63 rval = 1; 64 } 65 66 void 67 oerr(void) 68 { 69 err(1, "stdout"); 70 } 71 72 /* 73 * Print `len' bytes from the file associated with `mip', starting at 74 * absolute file offset `startoff'. May move map window. 75 */ 76 int 77 mapprint(struct mapinfo *mip, off_t startoff, off_t len) 78 { 79 int n; 80 81 while (len > 0) { 82 if (startoff < mip->mapoff || startoff >= mip->mapoff + 83 (off_t)mip->maplen) { 84 if (maparound(mip, startoff) != 0) 85 return (1); 86 } 87 n = (mip->mapoff + mip->maplen) - startoff; 88 if (n > len) 89 n = len; 90 WR(mip->start + (startoff - mip->mapoff), n); 91 startoff += n; 92 len -= n; 93 } 94 return (0); 95 } 96 97 /* 98 * Move the map window so that it contains the byte at absolute file 99 * offset `offset'. The start of the map window will be TAILMAPLEN 100 * aligned. 101 */ 102 int 103 maparound(struct mapinfo *mip, off_t offset) 104 { 105 106 if (mip->start != NULL && munmap(mip->start, mip->maplen) != 0) 107 return (1); 108 109 mip->mapoff = offset & ~((off_t)TAILMAPLEN - 1); 110 mip->maplen = TAILMAPLEN; 111 if ((off_t)mip->maplen > mip->maxoff - mip->mapoff) 112 mip->maplen = mip->maxoff - mip->mapoff; 113 if (mip->maplen <= 0) 114 abort(); 115 if ((mip->start = mmap(NULL, mip->maplen, PROT_READ, MAP_SHARED, 116 mip->fd, mip->mapoff)) == MAP_FAILED) 117 return (1); 118 119 return (0); 120 } 121 122 /* 123 * Print the file name without stdio buffering. 124 */ 125 void 126 printfn(const char *fn, int print_nl) 127 { 128 129 if (print_nl) 130 WR("\n", 1); 131 WR("==> ", 4); 132 WR(fn, strlen(fn)); 133 WR(" <==\n", 5); 134 } 135