/*      NetBSD: print-ascii.c,v 1.1 1999/09/30 14:49:12 sjg Exp         */

/*-
* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Alan Barrett and Simon J. Gerraty.
*
* 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>
#ifndef lint
__RCSID("$NetBSD: print-ascii.c,v 1.9 2024/09/02 16:15:30 christos Exp $");
#endif

/* \summary: ASCII packet dump printer */

#include <config.h>

#include "netdissect-stdinc.h"

#include <stdio.h>

#include "netdissect-ctype.h"

#include "netdissect.h"
#include "extract.h"

#define ASCII_LINELENGTH 300
#define HEXDUMP_BYTES_PER_LINE 16
#define HEXDUMP_SHORTS_PER_LINE (HEXDUMP_BYTES_PER_LINE / 2)
#define HEXDUMP_HEXSTUFF_PER_SHORT 5 /* 4 hex digits and a space */
#define HEXDUMP_HEXSTUFF_PER_LINE \
               (HEXDUMP_HEXSTUFF_PER_SHORT * HEXDUMP_SHORTS_PER_LINE)

void
ascii_print(netdissect_options *ndo,
           const u_char *cp, u_int length)
{
       u_int caplength;
       u_char s;
       int truncated = FALSE;

       ndo->ndo_protocol = "ascii";
       caplength = ND_BYTES_AVAILABLE_AFTER(cp);
       if (length > caplength) {
               length = caplength;
               truncated = TRUE;
       }
       ND_PRINT("\n");
       while (length > 0) {
               s = GET_U_1(cp);
               cp++;
               length--;
               if (s == '\r') {
                       /*
                        * Don't print CRs at the end of the line; they
                        * don't belong at the ends of lines on UN*X,
                        * and the standard I/O library will give us one
                        * on Windows so we don't need to print one
                        * ourselves.
                        *
                        * In the middle of a line, just print a '.'.
                        */
                       if (length > 1 && GET_U_1(cp) != '\n')
                               ND_PRINT(".");
               } else {
                       if (!ND_ASCII_ISGRAPH(s) &&
                           (s != '\t' && s != ' ' && s != '\n'))
                               ND_PRINT(".");
                       else
                               ND_PRINT("%c", s);
               }
       }
       if (truncated)
               nd_trunc_longjmp(ndo);
}

static void
hex_and_ascii_print_with_offset(netdissect_options *ndo, const char *ident,
   const u_char *cp, u_int length, u_int oset)
{
       u_int caplength;
       u_int i;
       u_int s1, s2;
       u_int nshorts;
       int truncated = FALSE;
       char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp;
       char asciistuff[ASCII_LINELENGTH+1], *asp;

       caplength = ND_BYTES_AVAILABLE_AFTER(cp);
       if (length > caplength) {
               length = caplength;
               truncated = TRUE;
       }
       nshorts = length / sizeof(u_short);
       i = 0;
       hsp = hexstuff; asp = asciistuff;
       while (nshorts != 0) {
               s1 = GET_U_1(cp);
               cp++;
               s2 = GET_U_1(cp);
               cp++;
               (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
                   " %02x%02x", s1, s2);
               hsp += HEXDUMP_HEXSTUFF_PER_SHORT;
               *(asp++) = (char)(ND_ASCII_ISGRAPH(s1) ? s1 : '.');
               *(asp++) = (char)(ND_ASCII_ISGRAPH(s2) ? s2 : '.');
               i++;
               if (i >= HEXDUMP_SHORTS_PER_LINE) {
                       *hsp = *asp = '\0';
                       ND_PRINT("%s0x%04x: %-*s  %s",
                           ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
                           hexstuff, asciistuff);
                       i = 0; hsp = hexstuff; asp = asciistuff;
                       oset += HEXDUMP_BYTES_PER_LINE;
               }
               nshorts--;
       }
       if (length & 1) {
               s1 = GET_U_1(cp);
               cp++;
               (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
                   " %02x", s1);
               hsp += 3;
               *(asp++) = (char)(ND_ASCII_ISGRAPH(s1) ? s1 : '.');
               ++i;
       }
       if (i > 0) {
               *hsp = *asp = '\0';
               ND_PRINT("%s0x%04x: %-*s  %s",
                    ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
                    hexstuff, asciistuff);
       }
       if (truncated)
               nd_trunc_longjmp(ndo);
}

void
hex_and_ascii_print(netdissect_options *ndo, const char *ident,
   const u_char *cp, u_int length)
{
       hex_and_ascii_print_with_offset(ndo, ident, cp, length, 0);
}

/*
* telnet_print() wants this.  It is essentially default_print_unaligned()
*/
void
hex_print_with_offset(netdissect_options *ndo,
                     const char *ident, const u_char *cp, u_int length,
                     u_int oset)
{
       u_int caplength;
       u_int i, s;
       u_int nshorts;
       int truncated = FALSE;

       caplength = ND_BYTES_AVAILABLE_AFTER(cp);
       if (length > caplength) {
               length = caplength;
               truncated = TRUE;
       }
       nshorts = length / sizeof(u_short);
       i = 0;
       while (nshorts != 0) {
               if ((i++ % 8) == 0) {
                       ND_PRINT("%s0x%04x: ", ident, oset);
                       oset += HEXDUMP_BYTES_PER_LINE;
               }
               s = GET_U_1(cp);
               cp++;
               ND_PRINT(" %02x%02x", s, GET_U_1(cp));
               cp++;
               nshorts--;
       }
       if (length & 1) {
               if ((i % 8) == 0)
                       ND_PRINT("%s0x%04x: ", ident, oset);
               ND_PRINT(" %02x", GET_U_1(cp));
       }
       if (truncated)
               nd_trunc_longjmp(ndo);
}

void
hex_print(netdissect_options *ndo,
         const char *ident, const u_char *cp, u_int length)
{
       hex_print_with_offset(ndo, ident, cp, length, 0);
}

#ifdef MAIN
int
main(int argc, char *argv[])
{
       hex_print("\n\t", "Hello, World!\n", 14);
       printf("\n");
       hex_and_ascii_print("\n\t", "Hello, World!\n", 14);
       printf("\n");
       ascii_print("Hello, World!\n", 14);
       printf("\n");
#define TMSG "Now is the winter of our discontent...\n"
       hex_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
       printf("\n");
       hex_and_ascii_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
       printf("\n");
       exit(0);
}
#endif /* MAIN */

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