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 "extern.h" 55 56 void 57 ierr(const char *fname) 58 { 59 warn("%s", fname); 60 rval = 1; 61 } 62 63 void 64 oerr(void) 65 { 66 err(1, "stdout"); 67 } 68 69 /* 70 * Print `len' bytes from the file associated with `mip', starting at 71 * absolute file offset `startoff'. May move map window. 72 */ 73 int 74 mapprint(struct mapinfo *mip, off_t startoff, off_t len) 75 { 76 int n; 77 78 while (len > 0) { 79 if (startoff < mip->mapoff || startoff >= mip->mapoff + 80 (off_t)mip->maplen) { 81 if (maparound(mip, startoff) != 0) 82 return (1); 83 } 84 n = (mip->mapoff + mip->maplen) - startoff; 85 if (n > len) 86 n = len; 87 WR(mip->start + (startoff - mip->mapoff), n); 88 startoff += n; 89 len -= n; 90 } 91 return (0); 92 } 93 94 /* 95 * Move the map window so that it contains the byte at absolute file 96 * offset `offset'. The start of the map window will be TAILMAPLEN 97 * aligned. 98 */ 99 int 100 maparound(struct mapinfo *mip, off_t offset) 101 { 102 103 if (mip->start != NULL && munmap(mip->start, mip->maplen) != 0) 104 return (1); 105 106 mip->mapoff = offset & ~((off_t)TAILMAPLEN - 1); 107 mip->maplen = TAILMAPLEN; 108 if ((off_t)mip->maplen > mip->maxoff - mip->mapoff) 109 mip->maplen = mip->maxoff - mip->mapoff; 110 if (mip->maplen <= 0) 111 abort(); 112 if ((mip->start = mmap(NULL, mip->maplen, PROT_READ, MAP_SHARED, 113 mip->fd, mip->mapoff)) == MAP_FAILED) 114 return (1); 115 116 return (0); 117 } 118 119 /* 120 * Print the file name without stdio buffering. 121 */ 122 void 123 printfn(const char *fn, int print_nl) 124 { 125 126 if (print_nl) 127 WR("\n", 1); 128 WR("==> ", 4); 129 WR(fn, strlen(fn)); 130 WR(" <==\n", 5); 131 } 132