97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/*-
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* Copyright (c) 2017 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: hexdump.c,v 1.4 2017/12/09 00:51:52 christos Exp $");
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#ifdef DEBUG_HEXDUMP
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <stdlib.h>
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#define RET int
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static const char hexdigits[] = "0123456789abcdef";
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#else
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#define RET void
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#include <lib/libkern/libkern.h>
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#include <sys/systm.h>
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#endif
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#define MID (3 * 8)
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#define BAR ((3 * 16) + 1)
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#define ASC (BAR + 2)
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#define NL (BAR + 18)
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void
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hexdump(RET (*pr)(const char *, ...) __printflike(1, 2), const char *msg,
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const void *ptr, size_t len)
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{
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size_t i, p, q;
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const unsigned char *u = ptr;
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char buf[NL + 2];
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if (msg)
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(*pr)("%s: %zu bytes @ %p\n", msg, len, ptr);
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buf[BAR] = '|';
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buf[BAR + 1] = ' ';
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buf[NL] = '\n';
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buf[NL + 1] = '\0';
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for (q = p = i = 0; i < len; i++) {
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unsigned char c = u[i];
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buf[p++] = hexdigits[(c >> 4) & 0xf];
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buf[p++] = hexdigits[(c >> 0) & 0xf];
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buf[p++] = ' ';
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if (q == 7)
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buf[p++] = ' ';
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buf[ASC + q++] = isprint(c) ? c : '.';
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if (q == 16) {
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q = p = 0;
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(*pr)("%s", buf);
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}
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}
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if (q) {
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while (p < BAR)
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buf[p++] = ' ';
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buf[ASC + q++] = '\n';
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buf[ASC + q] = '\0';
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(*pr)("%s", buf);
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}
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}
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#ifdef DEBUG_HEXDUMP
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int
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main(int argc, char *argv[])
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{
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hexdump(printf, "foo", main, atoi(argv[1]));
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return 0;
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}
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#endif
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