From a86f52df1b164dce52103854d9c0f6dcc01308e0 Mon Sep 17 00:00:00 2001
From: Dale Rahn <drahn@cvs.openbsd.org>
Date: Mon, 18 May 2009 20:27:20 +0000
Subject: Add buffer mechanism internal ld.so printing code. makes ktrace more
 readable. nudge nudge deraadt@

---
 libexec/ld.so/dl_printf.c | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/libexec/ld.so/dl_printf.c b/libexec/ld.so/dl_printf.c
index a7f84f02da3..7823727dda9 100644
--- a/libexec/ld.so/dl_printf.c
+++ b/libexec/ld.so/dl_printf.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dl_printf.c,v 1.13 2003/07/06 20:03:57 deraadt Exp $	*/
+/*	$OpenBSD: dl_printf.c,v 1.14 2009/05/18 20:27:19 drahn Exp $	*/
 
 /*-
  * Copyright (c) 1993
@@ -60,8 +60,14 @@
 #include "syscall.h"
 #include "util.h"
 
+int lastfd = -1;
+#define OUTBUFSIZE 128
+static char outbuf[OUTBUFSIZE];
+static char *outptr = outbuf;
+
 static void kprintn(void (*)(int,int), int, u_long, int);
 static void kdoprnt(void (*)(int,int), int, const char *, va_list);
+static void _dl_flushbuf(void);
 
 static void putcharfd(int, int );
 
@@ -69,8 +75,27 @@ static void
 putcharfd(int c, int fd)
 {
 	char b = c;
+	int len;
+
+	if (fd != lastfd) {
+		_dl_flushbuf();
+		lastfd = fd;
+	}
+	*outptr++ = b;
+	len = outptr - outbuf;
+	if ((len >= OUTBUFSIZE) || (b == '\n') || (b == '\r')) {
+		_dl_flushbuf();
+	}
+}
 
-	_dl_write(fd, &b, 1);
+static void
+_dl_flushbuf()
+{
+	int len = outptr - outbuf;
+	if (len != 0) {
+		_dl_write(lastfd, outbuf, len);
+		outptr = outbuf;
+	}
 }
 
 void
@@ -198,6 +223,7 @@ reswitch:
 		}
 	}
 	va_end(ap);
+	_dl_flushbuf();
 }
 
 static void
-- 
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