"-A" flag to print packet data in ASCII, from Jørgen Thomsen

<jth@jth.net>.

1 files changed, 43 insertions, 19 deletions

diff --git a/print-ascii.c b/print-ascii.c
index c8f65fd3..14616aae 100644
--- a/print-ascii.c
+++ b/print-ascii.c
@@ -42,7 +42,7 @@
 
 #ifndef lint
 static const char rcsid[] =
-     "@(#) $Header: /tcpdump/master/tcpdump/print-ascii.c,v 1.6 2000-01-29 16:47:46 itojun Exp $";
+     "@(#) $Header: /tcpdump/master/tcpdump/print-ascii.c,v 1.7 2002-04-24 06:55:55 guy Exp $";
 #endif
 #include <stdio.h>
 #include <sys/types.h>
@@ -50,6 +50,7 @@ static const char rcsid[] =
 
 #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 */
@@ -64,41 +65,64 @@ ascii_print_with_offset(register const u_char *cp, register u_int length,
 	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;
+	int maxlength = (Aflag ? ASCII_LINELENGTH : HEXDUMP_SHORTS_PER_LINE);
 
 	nshorts = length / sizeof(u_short);
 	i = 0;
 	hsp = hexstuff; asp = asciistuff;
+	if (Aflag) *(asp++) = '\n';
 	while (--nshorts >= 0) {
 		s1 = *cp++;
 		s2 = *cp++;
-		(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;
+		if (Aflag) {
+			i += 2;
+			*(asp++) = (isgraph(s1) ? s1 : (s1 != '\t' && s1 != ' ' && s1 != '\n' && s1 != '\r' ? '.' : s1) );
+			*(asp++) = (isgraph(s2) ? s2 : (s2 != '\t' && s2 != ' ' && s2 != '\n' && s2 != '\r' ? '.' : s2) );
+			if (s1 == '\n' || s2 == '\n') i = maxlength;
+
+		} else {
+			(void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
+			    " %02x%02x", s1, s2);
+			hsp += HEXDUMP_HEXSTUFF_PER_SHORT;
+			*(asp++) = (isgraph(s1) ? s1 : '.');
+			*(asp++) = (isgraph(s2) ? s2 : '.');
+			i++;
+		}
+		if (i >= maxlength) {
+			*hsp = *asp = '\0';
+			if (Aflag) {
+				(void)printf("%s", asciistuff);
+			} else {
+				(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;
 		}
 	}
 	if (length & 1) {
 		s1 = *cp++;
-		(void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
-		    " %02x", s1);
-		hsp += 3;
-		*(asp++) = (isgraph(s1) ? s1 : '.');
+		if (Aflag) {
+			*(asp++) = (isgraph(s1) ? s1 : (s1 != '\t' && s1 != ' ' && s1 != '\n' && s1 != '\r' ? '.' : s1) );
+		} else {
+			(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",
+		if (Aflag) {
+			(void)printf("\n%s", asciistuff);
+		} else {
+			(void)printf("\n0x%04x\t%-*s\t%s",
 			     oset, HEXDUMP_HEXSTUFF_PER_LINE,
 			     hexstuff, asciistuff);
+		}
 	}
 }