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
ierr(const char * fname)54 ierr(const char *fname)
55 {
56 warn("%s", fname);
57 rval = 1;
58 }
59
60 void
oerr(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
mapprint(struct mapinfo * mip,off_t startoff,off_t len)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
maparound(struct mapinfo * mip,off_t offset)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
printfn(const char * fn,int print_nl)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