The Tcpdump Group git mirrors - tcpdump/blob - print-ascii.c

   1 /*      $NetBSD: print-ascii.c,v 1.1 1999/09/30 14:49:12 sjg Exp $      */
   2
   3 /*-
   4  * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Alan Barrett and Simon J. Gerraty.
   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. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *        This product includes software developed by the NetBSD
  21  *        Foundation, Inc. and its contributors.
  22  * 4. Neither the name of The NetBSD Foundation nor the names of its
  23  *    contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  36  * POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 #ifdef HAVE_CONFIG_H
  40 #include "config.h"
  41 #endif
  42
  43 #ifndef lint
  44 static const char rcsid[] =
  45      "@(#) $Header: /tcpdump/master/tcpdump/print-ascii.c,v 1.5 2000-01-17 06:24:24 itojun Exp $";
  46 #endif
  47 #include <stdio.h>
  48 #include <sys/types.h>
  49 #include <ctype.h>
  50
  51 #include "interface.h"
  52
  53 #define HEXDUMP_BYTES_PER_LINE 16
  54 #define HEXDUMP_SHORTS_PER_LINE (HEXDUMP_BYTES_PER_LINE / 2)
  55 #define HEXDUMP_HEXSTUFF_PER_SHORT 5 /* 4 hex digits and a space */
  56 #define HEXDUMP_HEXSTUFF_PER_LINE \
  57                 (HEXDUMP_HEXSTUFF_PER_SHORT * HEXDUMP_SHORTS_PER_LINE)
  58
  59 void
  60 ascii_print_with_offset(register const u_char *cp, register u_int length,
  61                         register u_int oset)
  62 {
  63         register u_int i;
  64         register int s1, s2;
  65         register int nshorts;
  66         char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp;
  67         char asciistuff[HEXDUMP_BYTES_PER_LINE+1], *asp;
  68
  69         nshorts = length / sizeof(u_short);
  70         i = 0;
  71         hsp = hexstuff; asp = asciistuff;
  72         while (--nshorts >= 0) {
  73                 s1 = *cp++;
  74                 s2 = *cp++;
  75                 (void)snprintf(hsp, sizeof(hsp), " %02x%02x", s1, s2);
  76                 hsp += HEXDUMP_HEXSTUFF_PER_SHORT;
  77                 *(asp++) = (isgraph(s1) ? s1 : '.');
  78                 *(asp++) = (isgraph(s2) ? s2 : '.');
  79                 if (++i >= HEXDUMP_SHORTS_PER_LINE) {
  80                     *hsp = *asp = '\0';
  81                     (void)printf("\n0x%04x\t%-*s\t%s",
  82                                  oset, HEXDUMP_HEXSTUFF_PER_LINE,
  83                                  hexstuff, asciistuff);
  84                     i = 0; hsp = hexstuff; asp = asciistuff;
  85                     oset += HEXDUMP_BYTES_PER_LINE;
  86                 }
  87         }
  88         if (length & 1) {
  89                 s1 = *cp++;
  90                 (void)snprintf(hsp, sizeof(hsp), " %02x", s1);
  91                 hsp += 3;
  92                 *(asp++) = (isgraph(s1) ? s1 : '.');
  93                 ++i;
  94         }
  95         if (i > 0) {
  96                 *hsp = *asp = '\0';
  97                 (void)printf("\n0x%04x\t%-*s\t%s",
  98                              oset, HEXDUMP_HEXSTUFF_PER_LINE,
  99                              hexstuff, asciistuff);
 100         }
 101 }
 102
 103 void
 104 ascii_print(register const u_char *cp, register u_int length)
 105 {
 106         ascii_print_with_offset(cp, length, 0);
 107 }
 108
 109 /*
 110  * telnet_print() wants this.  It is essentially default_print_unaligned()
 111  */
 112 void
 113 hex_print_with_offset(register const u_char *cp, register u_int length,
 114                       register u_int oset)
 115 {
 116         register u_int i, s;
 117         register int nshorts;
 118
 119         nshorts = (u_int) length / sizeof(u_short);
 120         i = 0;
 121         while (--nshorts >= 0) {
 122                 if ((i++ % 8) == 0) {
 123                         (void)printf("\n0x%04x\t", oset);
 124                         oset += HEXDUMP_BYTES_PER_LINE;
 125                 }
 126                 s = *cp++;
 127                 (void)printf(" %02x%02x", s, *cp++);
 128         }
 129         if (length & 1) {
 130                 if ((i % 8) == 0)
 131                         (void)printf("\n0x%04x\t", oset);
 132                 (void)printf(" %02x", *cp);
 133         }
 134 }
 135
 136 /*
 137  * just for completeness
 138  */
 139 void
 140 hex_print(register const u_char *cp, register u_int length)
 141 {
 142         hex_print_with_offset(cp, length, 0);
 143 }
 144
 145 #ifdef MAIN
 146 int
 147 main(int argc, char *argv[])
 148 {
 149         hex_print("Hello, World!\n", 14);
 150         printf("\n");
 151         ascii_print("Hello, World!\n", 14);
 152         printf("\n");
 153 #define TMSG "Now is the winter of our discontent...\n"
 154         ascii_print_with_offset(TMSG, sizeof(TMSG) - 1, 0x100);
 155         printf("\n");
 156         exit(0);
 157 }
 158 #endif /* MAIN */