new goodies

src/cmd/ip/snoopy/dump.c

@@ -0,0 +1,92 @@
+#include <u.h>
+#include <libc.h>
+#include <ip.h>
+#include <ctype.h>
+#include "dat.h"
+#include "protos.h"
+
+static void
+p_compile(Filter *f)
+{
+	USED(f);
+}
+
+static int
+p_filter(Filter *f, Msg *m)
+{
+	USED(f);
+	USED(m);
+	return 0;
+}
+
+static char tohex[16] = {
+	'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+	'a', 'b', 'c', 'd', 'e', 'f'
+};
+
+static int
+p_seprint(Msg *m)
+{
+	int c, i, n, isstring;
+	uchar *ps = m->ps;
+	char *p = m->p;
+	char *e = m->e;
+
+	n = m->pe - ps;
+	if(n > Nflag)
+		n = Nflag;
+
+	isstring = 1;
+	for(i = 0; i < n; i++){
+		c = ps[i];
+		if(!isprint(c) && !isspace(c)){
+			isstring = 0;
+			break;
+		}
+	}
+
+	if(isstring){
+		for(i = 0; i < n && p+1<e; i++){
+			c = ps[i];
+			switch(c){
+			case '\t':
+				*p++ = '\\';
+				*p++ = 't';
+				break;
+			case '\r':
+				*p++ = '\\';
+				*p++ = 'r';
+				break;
+			case '\n':
+				*p++ = '\\';
+				*p++ = 'n';
+				break;
+			default:
+				*p++ = c;
+			}
+		}
+	} else {
+		for(i = 0; i < n && p+1<e; i++){
+			c = ps[i];
+			*p++ = tohex[c>>4];
+			*p++ = tohex[c&0xf]; 
+		}
+	}
+
+	m->pr = nil;
+	m->p = p;
+	m->ps = ps;
+
+	return 0;
+}
+
+Proto dump =
+{
+	"dump",
+	p_compile,
+	p_filter,
+	p_seprint,
+	nil,
+	nil,
+	defaultframer,
+};