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 1.8 2002-06-11 17:08:42 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 ASCII_LINELENGTH 300
  54 #define HEXDUMP_BYTES_PER_LINE 16
  55 #define HEXDUMP_SHORTS_PER_LINE (HEXDUMP_BYTES_PER_LINE / 2)
  56 #define HEXDUMP_HEXSTUFF_PER_SHORT 5 /* 4 hex digits and a space */
  57 #define HEXDUMP_HEXSTUFF_PER_LINE \
  58                 (HEXDUMP_HEXSTUFF_PER_SHORT * HEXDUMP_SHORTS_PER_LINE)
  59
  60 void
  61 ascii_print_with_offset(register const u_char *cp, register u_int length,
  62                         register u_int oset)
  63 {
  64         register u_int i;
  65         register int s1, s2;
  66         register int nshorts;
  67         char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp;
  68         char asciistuff[ASCII_LINELENGTH+1], *asp;
  69         int maxlength = (Aflag ? ASCII_LINELENGTH : HEXDUMP_SHORTS_PER_LINE);
  70
  71         nshorts = length / sizeof(u_short);
  72         i = 0;
  73         hsp = hexstuff; asp = asciistuff;
  74         if (Aflag) *(asp++) = '\n';
  75         while (--nshorts >= 0) {
  76                 s1 = *cp++;
  77                 s2 = *cp++;
  78                 if (Aflag) {
  79                         i += 2;
  80                         *(asp++) = (isgraph(s1) ? s1 : (s1 != '\t' && s1 != ' ' && s1 != '\n' && s1 != '\r' ? '.' : s1) );
  81                         *(asp++) = (isgraph(s2) ? s2 : (s2 != '\t' && s2 != ' ' && s2 != '\n' && s2 != '\r' ? '.' : s2) );
  82                         if (s1 == '\n' || s2 == '\n') i = maxlength;
  83
  84                 } else {
  85                         (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
  86                             " %02x%02x", s1, s2);
  87                         hsp += HEXDUMP_HEXSTUFF_PER_SHORT;
  88                         *(asp++) = (isgraph(s1) ? s1 : '.');
  89                         *(asp++) = (isgraph(s2) ? s2 : '.');
  90                         i++;
  91                 }
  92                 if (i >= maxlength) {
  93                         *hsp = *asp = '\0';
  94                         if (Aflag) {
  95                                 (void)printf("%s", asciistuff);
  96                         } else {
  97                                 (void)printf("\n0x%04x\t%-*s\t%s",
  98                                     oset, HEXDUMP_HEXSTUFF_PER_LINE,
  99                                     hexstuff, asciistuff);
 100                         }
 101                         i = 0; hsp = hexstuff; asp = asciistuff;
 102                         oset += HEXDUMP_BYTES_PER_LINE;
 103                 }
 104         }
 105         if (length & 1) {
 106                 s1 = *cp++;
 107                 if (Aflag) {
 108                         *(asp++) = (isgraph(s1) ? s1 : (s1 != '\t' && s1 != ' ' && s1 != '\n' && s1 != '\r' ? '.' : s1) );
 109                 } else {
 110                         (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
 111                             " %02x", s1);
 112                         hsp += 3;
 113                         *(asp++) = (isgraph(s1) ? s1 : '.');
 114                 }
 115                 ++i;
 116         }
 117         if (i > 0) {
 118                 *hsp = *asp = '\0';
 119                 if (Aflag) {
 120                         (void)printf("\n%s", asciistuff);
 121                 } else {
 122                         (void)printf("\n0x%04x\t%-*s\t%s",
 123                              oset, HEXDUMP_HEXSTUFF_PER_LINE,
 124                              hexstuff, asciistuff);
 125                 }
 126         }
 127 }
 128
 129 void
 130 ascii_print(register const u_char *cp, register u_int length)
 131 {
 132         ascii_print_with_offset(cp, length, 0);
 133 }
 134
 135 /*
 136  * telnet_print() wants this.  It is essentially default_print_unaligned()
 137  */
 138 void
 139 hex_print_with_offset(register const u_char *cp, register u_int length,
 140                       register u_int oset)
 141 {
 142         register u_int i, s;
 143         register int nshorts;
 144
 145         nshorts = (u_int) length / sizeof(u_short);
 146         i = 0;
 147         while (--nshorts >= 0) {
 148                 if ((i++ % 8) == 0) {
 149                         (void)printf("\n0x%04x\t", oset);
 150                         oset += HEXDUMP_BYTES_PER_LINE;
 151                 }
 152                 s = *cp++;
 153                 (void)printf(" %02x%02x", s, *cp++);
 154         }
 155         if (length & 1) {
 156                 if ((i % 8) == 0)
 157                         (void)printf("\n0x%04x\t", oset);
 158                 (void)printf(" %02x", *cp);
 159         }
 160 }
 161
 162 /*
 163  * just for completeness
 164  */
 165 void
 166 hex_print(register const u_char *cp, register u_int length)
 167 {
 168         hex_print_with_offset(cp, length, 0);
 169 }
 170
 171 #ifdef MAIN
 172 int
 173 main(int argc, char *argv[])
 174 {
 175         hex_print("Hello, World!\n", 14);
 176         printf("\n");
 177         ascii_print("Hello, World!\n", 14);
 178         printf("\n");
 179 #define TMSG "Now is the winter of our discontent...\n"
 180         ascii_print_with_offset(TMSG, sizeof(TMSG) - 1, 0x100);
 181         printf("\n");
 182         exit(0);
 183 }
 184 #endif /* MAIN */