X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/2813c22cf1ab58ee309749eae16f6211cea59952..bc619816f47834be0f699a05b4ce8048e027238b:/print-ascii.c

diff --git a/print-ascii.c b/print-ascii.c
index 8483c47b..65815bde 100644
--- a/print-ascii.c
+++ b/print-ascii.c
@@ -40,87 +40,120 @@
 #include "config.h"
 #endif
 
-#include <sys/cdefs.h>
 #ifndef lint
-__RCSID("$NetBSD: print-ascii.c,v 1.1 1999/09/30 14:49:12 sjg Exp $");
+static const char rcsid[] _U_ =
+     "@(#) $Header: /tcpdump/master/tcpdump/print-ascii.c,v 1.17 2005-07-06 20:53:32 guy Exp $";
 #endif
+#include <tcpdump-stdinc.h>
 #include <stdio.h>
-#include <sys/types.h>
-#include <ctype.h>
 
 #include "interface.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(register const u_char *cp, register u_int length)
+{
+	u_int caplength;
+	register int s;
+
+	caplength = (snapend >= cp) ? snapend - cp : 0;
+	if (length > caplength)
+		length = caplength;
+	putchar('\n');
+	while (length > 0) {
+		s = *cp++;
+		length--;
+		if (!isgraph(s) &&
+		    (s != '\t' && s != ' ' && s != '\n' && s != '\r'))
+			putchar('.');
+		else
+			putchar(s);
+	}
+}
+
 void
-ascii_print_with_offset(register const u_char *cp, register u_int length,
-			register u_int oset)
+hex_and_ascii_print_with_offset(register const char *ident,
+    register const u_char *cp, register u_int length, register u_int oset)
 {
+	u_int caplength;
 	register u_int i;
 	register int s1, s2;
 	register int nshorts;
 	char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp;
-	char asciistuff[HEXDUMP_BYTES_PER_LINE+1], *asp;
+	char asciistuff[ASCII_LINELENGTH+1], *asp;
 
+	caplength = (snapend >= cp) ? snapend - cp : 0;
+	if (length > caplength)
+		length = caplength;
 	nshorts = length / sizeof(u_short);
 	i = 0;
 	hsp = hexstuff; asp = asciistuff;
 	while (--nshorts >= 0) {
 		s1 = *cp++;
 		s2 = *cp++;
-		(void)sprintf(hsp, " %02x%02x", s1, s2);
+		(void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
+		    " %02x%02x", s1, s2);
 		hsp += HEXDUMP_HEXSTUFF_PER_SHORT;
 		*(asp++) = (isgraph(s1) ? s1 : '.');
 		*(asp++) = (isgraph(s2) ? s2 : '.');
-		if (++i >= HEXDUMP_SHORTS_PER_LINE) {
-		    *hsp = *asp = '\0';
-		    (void)printf("\n0x%04x\t%-*s\t%s",
-				 oset, HEXDUMP_HEXSTUFF_PER_LINE,
-				 hexstuff, asciistuff);
-		    i = 0; hsp = hexstuff; asp = asciistuff;
-		    oset += HEXDUMP_BYTES_PER_LINE;
+		i++;
+		if (i >= HEXDUMP_SHORTS_PER_LINE) {
+			*hsp = *asp = '\0';
+			(void)printf("%s0x%04x: %-*s  %s",
+			    ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
+			    hexstuff, asciistuff);
+			i = 0; hsp = hexstuff; asp = asciistuff;
+			oset += HEXDUMP_BYTES_PER_LINE;
 		}
 	}
 	if (length & 1) {
 		s1 = *cp++;
-		(void)sprintf(hsp, " %02x", s1);
+		(void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
+		    " %02x", s1);
 		hsp += 3;
 		*(asp++) = (isgraph(s1) ? s1 : '.');
 		++i;
 	}
 	if (i > 0) {
 		*hsp = *asp = '\0';
-		(void)printf("\n0x%04x\t%-*s\t%s",
-			     oset, HEXDUMP_HEXSTUFF_PER_LINE,
-			     hexstuff, asciistuff);
+		(void)printf("%s0x%04x: %-*s  %s",
+		     ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
+		     hexstuff, asciistuff);
 	}
 }
 
 void
-ascii_print(register const u_char *cp, register u_int length)
+hex_and_ascii_print(register const char *ident, register const u_char *cp,
+    register u_int length)
 {
-	ascii_print_with_offset(cp, length, 0);
+	hex_and_ascii_print_with_offset(ident, cp, length, 0);
 }
-	
+
 /*
  * telnet_print() wants this.  It is essentially default_print_unaligned()
  */
 void
-hex_print_with_offset(register const u_char *cp, register u_int length,
+hex_print_with_offset(register const char *ident, register const u_char *cp, register u_int length,
 		      register u_int oset)
 {
+	u_int caplength;
 	register u_int i, s;
 	register int nshorts;
 
+	caplength = (snapend >= cp) ? snapend - cp : 0;
+	if (length > caplength)
+		length = caplength;
 	nshorts = (u_int) length / sizeof(u_short);
 	i = 0;
 	while (--nshorts >= 0) {
 		if ((i++ % 8) == 0) {
-			(void)printf("\n0x%04x\t", oset);
+			(void)printf("%s0x%04x: ", ident, oset);
 			oset += HEXDUMP_BYTES_PER_LINE;
 		}
 		s = *cp++;
@@ -128,7 +161,7 @@ hex_print_with_offset(register const u_char *cp, register u_int length,
 	}
 	if (length & 1) {
 		if ((i % 8) == 0)
-			(void)printf("\n0x%04x\t", oset);
+			(void)printf("%s0x%04x: ", ident, oset);
 		(void)printf(" %02x", *cp);
 	}
 }
@@ -137,21 +170,25 @@ hex_print_with_offset(register const u_char *cp, register u_int length,
  * just for completeness
  */
 void
-hex_print(register const u_char *cp, register u_int length)
+hex_print(register const char *ident, register const u_char *cp, register u_int length)
 {
-	hex_print_with_offset(cp, length, 0);
+	hex_print_with_offset(ident, cp, length, 0);
 }
 
 #ifdef MAIN
 int
 main(int argc, char *argv[])
 {
-	hex_print("Hello, World!\n", 14);
+	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"
-	ascii_print_with_offset(TMSG, sizeof(TMSG) - 1, 0x100);
+	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);
 }