/*-
* Copyright (c) 2017 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: hexdump.c,v 1.4 2017/12/09 00:51:52 christos Exp $");

#ifdef DEBUG_HEXDUMP
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#define RET int
static const char hexdigits[] = "0123456789abcdef";
#else
#define RET void
#include <lib/libkern/libkern.h>
#include <sys/systm.h>
#endif

#define MID (3 * 8)
#define BAR ((3 * 16) + 1)
#define ASC (BAR + 2)
#define NL (BAR + 18)

void
hexdump(RET (*pr)(const char *, ...) __printflike(1, 2), const char *msg,
   const void *ptr, size_t len)
{
       size_t i, p, q;
       const unsigned char *u = ptr;
       char buf[NL + 2];

       if (msg)
               (*pr)("%s: %zu bytes @ %p\n", msg, len, ptr);

       buf[BAR] = '|';
       buf[BAR + 1] = ' ';
       buf[NL] = '\n';
       buf[NL + 1] = '\0';
       for (q = p = i = 0; i < len; i++) {
               unsigned char c = u[i];
               buf[p++] = hexdigits[(c >> 4) & 0xf];
               buf[p++] = hexdigits[(c >> 0) & 0xf];
               buf[p++] = ' ';
               if (q == 7)
                      buf[p++] = ' ';

               buf[ASC + q++] = isprint(c) ? c : '.';

               if (q == 16) {
                       q = p = 0;
                       (*pr)("%s", buf);
               }
       }
       if (q) {
               while (p < BAR)
                       buf[p++] = ' ';
               buf[ASC + q++] = '\n';
               buf[ASC + q] = '\0';
               (*pr)("%s", buf);
       }
}

#ifdef DEBUG_HEXDUMP
int
main(int argc, char *argv[])
{
       hexdump(printf, "foo", main, atoi(argv[1]));
       return 0;
}
#endif