lib/libutil/hexdump.c

   1 /*-
   2  * Copyright (c) 1986, 1988, 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * (c) UNIX System Laboratories, Inc.
   5  * All or some portions of this file are derived from material licensed
   6  * to the University of California by American Telephone and Telegraph
   7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   8  * the permission of UNIX System Laboratories, Inc.
   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  *      @(#)subr_prf.c  8.3 (Berkeley) 1/21/94
  35  * $FreeBSD: head/lib/libutil/hexdump.c 180161 2008-07-01 22:30:57Z jhb $
  36  */
  37
  38 #include <sys/types.h>
  39 #include <libutil.h>
  40 #include <stdio.h>
  41
  42 void
  43 hexdump(const void *ptr, int length, const char *hdr, int flags)
  44 {
  45         int i, j, k;
  46         int cols;
  47         const unsigned char *cp;
  48         char delim;
  49
  50         if ((flags & HD_DELIM_MASK) != 0)
  51                 delim = (flags & HD_DELIM_MASK) >> 8;
  52         else
  53                 delim = ' ';
  54
  55         if ((flags & HD_COLUMN_MASK) != 0)
  56                 cols = flags & HD_COLUMN_MASK;
  57         else
  58                 cols = 16;
  59
  60         cp = ptr;
  61         for (i = 0; i < length; i+= cols) {
  62                 if (hdr != NULL)
  63                         printf("%s", hdr);
  64
  65                 if ((flags & HD_OMIT_COUNT) == 0)
  66                         printf("%04x  ", i);
  67
  68                 if ((flags & HD_OMIT_HEX) == 0) {
  69                         for (j = 0; j < cols; j++) {
  70                                 k = i + j;
  71                                 if (k < length)
  72                                         printf("%c%02x", delim, cp[k]);
  73                                 else
  74                                         printf("   ");
  75                         }
  76                 }
  77
  78                 if ((flags & HD_OMIT_CHARS) == 0) {
  79                         printf("  |");
  80                         for (j = 0; j < cols; j++) {
  81                                 k = i + j;
  82                                 if (k >= length)
  83                                         printf(" ");
  84                                 else if (cp[k] >= ' ' && cp[k] <= '~')
  85                                         printf("%c", cp[k]);
  86                                 else
  87                                         printf(".");
  88                         }
  89                         printf("|");
  90                 }
  91                 printf("\n");
  92         }
  93 }
  94