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 1.6 2000/01/29 16:47:46 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(hexstuff) - (hsp - hexstuff), 76 " %02x%02x", s1, s2); 77 hsp += HEXDUMP_HEXSTUFF_PER_SHORT; 78 *(asp++) = (isgraph(s1) ? s1 : '.'); 79 *(asp++) = (isgraph(s2) ? s2 : '.'); 80 if (++i >= HEXDUMP_SHORTS_PER_LINE) { 81 *hsp = *asp = '\0'; 82 (void)printf("\n0x%04x\t%-*s\t%s", 83 oset, HEXDUMP_HEXSTUFF_PER_LINE, 84 hexstuff, asciistuff); 85 i = 0; hsp = hexstuff; asp = asciistuff; 86 oset += HEXDUMP_BYTES_PER_LINE; 87 } 88 } 89 if (length & 1) { 90 s1 = *cp++; 91 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff), 92 " %02x", s1); 93 hsp += 3; 94 *(asp++) = (isgraph(s1) ? s1 : '.'); 95 ++i; 96 } 97 if (i > 0) { 98 *hsp = *asp = '\0'; 99 (void)printf("\n0x%04x\t%-*s\t%s", 100 oset, HEXDUMP_HEXSTUFF_PER_LINE, 101 hexstuff, asciistuff); 102 } 103 } 104 105 void 106 ascii_print(register const u_char *cp, register u_int length) 107 { 108 ascii_print_with_offset(cp, length, 0); 109 } 110 111 /* 112 * telnet_print() wants this. It is essentially default_print_unaligned() 113 */ 114 void 115 hex_print_with_offset(register const u_char *cp, register u_int length, 116 register u_int oset) 117 { 118 register u_int i, s; 119 register int nshorts; 120 121 nshorts = (u_int) length / sizeof(u_short); 122 i = 0; 123 while (--nshorts >= 0) { 124 if ((i++ % 8) == 0) { 125 (void)printf("\n0x%04x\t", oset); 126 oset += HEXDUMP_BYTES_PER_LINE; 127 } 128 s = *cp++; 129 (void)printf(" %02x%02x", s, *cp++); 130 } 131 if (length & 1) { 132 if ((i % 8) == 0) 133 (void)printf("\n0x%04x\t", oset); 134 (void)printf(" %02x", *cp); 135 } 136 } 137 138 /* 139 * just for completeness 140 */ 141 void 142 hex_print(register const u_char *cp, register u_int length) 143 { 144 hex_print_with_offset(cp, length, 0); 145 } 146 147 #ifdef MAIN 148 int 149 main(int argc, char *argv[]) 150 { 151 hex_print("Hello, World!\n", 14); 152 printf("\n"); 153 ascii_print("Hello, World!\n", 14); 154 printf("\n"); 155 #define TMSG "Now is the winter of our discontent...\n" 156 ascii_print_with_offset(TMSG, sizeof(TMSG) - 1, 0x100); 157 printf("\n"); 158 exit(0); 159 } 160 #endif /* MAIN */ 161