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
53void
54ierr(const char *fname)
55{
56	warn("%s", fname);
57	rval = 1;
58}
59
60void
61oerr(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 */
70int
71mapprint(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 */
96int
97maparound(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 */
119void
120printfn(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