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 36 37 #include <sys/types.h> 38 #include <sys/stat.h> 39 #include <sys/mman.h> 40 41 #include <err.h> 42 #include <errno.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 48 #include <libcasper.h> 49 #include <casper/cap_fileargs.h> 50 51 #include "extern.h" 52 53 void 54 ierr(const char *fname) 55 { 56 warn("%s", fname); 57 rval = 1; 58 } 59 60 void 61 oerr(void) 62 { 63 err(1, "stdout"); 64 } 65 66 /* 67 * Print `len' bytes from the file associated with `mip', starting at 68 * absolute file offset `startoff'. May move map window. 69 */ 70 int 71 mapprint(struct mapinfo *mip, off_t startoff, off_t len) 72 { 73 int n; 74 75 while (len > 0) { 76 if (startoff < mip->mapoff || startoff >= mip->mapoff + 77 (off_t)mip->maplen) { 78 if (maparound(mip, startoff) != 0) 79 return (1); 80 } 81 n = (mip->mapoff + mip->maplen) - startoff; 82 if (n > len) 83 n = len; 84 WR(mip->start + (startoff - mip->mapoff), n); 85 startoff += n; 86 len -= n; 87 } 88 return (0); 89 } 90 91 /* 92 * Move the map window so that it contains the byte at absolute file 93 * offset `offset'. The start of the map window will be TAILMAPLEN 94 * aligned. 95 */ 96 int 97 maparound(struct mapinfo *mip, off_t offset) 98 { 99 100 if (mip->start != NULL && munmap(mip->start, mip->maplen) != 0) 101 return (1); 102 103 mip->mapoff = offset & ~((off_t)TAILMAPLEN - 1); 104 mip->maplen = TAILMAPLEN; 105 if ((off_t)mip->maplen > mip->maxoff - mip->mapoff) 106 mip->maplen = mip->maxoff - mip->mapoff; 107 if (mip->maplen <= 0) 108 abort(); 109 if ((mip->start = mmap(NULL, mip->maplen, PROT_READ, MAP_SHARED, 110 mip->fd, mip->mapoff)) == MAP_FAILED) 111 return (1); 112 113 return (0); 114 } 115 116 /* 117 * Print the file name without stdio buffering. 118 */ 119 void 120 printfn(const char *fn, int print_nl) 121 { 122 123 if (print_nl) 124 WR("\n", 1); 125 WR("==> ", 4); 126 WR(fn, strlen(fn)); 127 WR(" <==\n", 5); 128 } 129