From 42a027d5d0c10de40ac2e347b4991aa20d2d5ac3 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Sat, 28 Dec 1991 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1991-12-28

---
 gnot/screen.c | 33 +++++++++++++++---------
 pc/u.h        |  1 +
 pc/vga.c      | 71 +++++++++++++++++++++++++++++----------------------
 port/devdk.c  |  8 +++---
 ss/screen.c   | 33 +++++++++++++++---------
 5 files changed, 88 insertions(+), 58 deletions(-)

diff --git a/gnot/screen.c b/gnot/screen.c
index 31a03736d2fc3de6e39cc17b070d22dd74da04f5..528e7a0057ecba4c093536f3ffbd176f8f5516c8 100644
--- a/gnot/screen.c
+++ b/gnot/screen.c
@@ -21,6 +21,8 @@ struct{
 	int	bwid;
 }out;
 
+Lock	screenlock;
+
 GBitmap	gscreen =
 {
 	(ulong*)((4*1024*1024-256*1024)|KZERO),	/* BUG */
@@ -46,6 +48,17 @@ screeninit(void)
 	out.bwid = defont0.info[' '].width;
 }
 
+void
+screenputnl(void)
+{
+	out.pos.x = MINX;
+	out.pos.y += defont0.height;
+	if(out.pos.y > gscreen.r.max.y-defont0.height)
+		out.pos.y = gscreen.r.min.y;
+	gbitblt(&gscreen, Pt(0, out.pos.y), &gscreen,
+	    Rect(0, out.pos.y, gscreen.r.max.x, out.pos.y+2*defont0.height), 0);
+}
+
 void
 screenputs(char *s, int n)
 {
@@ -53,6 +66,7 @@ screenputs(char *s, int n)
 	int i;
 	char buf[4];
 
+	lock(&screenlock);
 	while(n > 0){
 		i = chartorune(&r, s);
 		if(i == 0){
@@ -64,29 +78,24 @@ screenputs(char *s, int n)
 		buf[i] = 0;
 		n -= i;
 		s += i;
-		if(r == '\n'){
-			out.pos.x = MINX;
-			out.pos.y += defont0.height;
-			if(out.pos.y > gscreen.r.max.y-defont0.height)
-				out.pos.y = gscreen.r.min.y;
-			gbitblt(&gscreen, Pt(0, out.pos.y), &gscreen,
-			    Rect(0, out.pos.y, gscreen.r.max.x, out.pos.y+2*defont0.height), 0);
-		}else if(r == '\t'){
+		if(r == '\n')
+			screenputnl();
+		else if(r == '\t'){
 			out.pos.x += (8-((out.pos.x-MINX)/out.bwid&7))*out.bwid;
 			if(out.pos.x >= gscreen.r.max.x)
-				screenputs("\n", 1);
+				screenputnl();
 		}else if(r == '\b'){
 			if(out.pos.x >= out.bwid+MINX){
 				out.pos.x -= out.bwid;
-				screenputs(" ", 1);
-				out.pos.x -= out.bwid;
+				gstring(&gscreen, out.pos, defont, " ", S);
 			}
 		}else{
 			if(out.pos.x >= gscreen.r.max.x-out.bwid)
-				screenputs("\n", 1);
+				screenputnl();
 			out.pos = gstring(&gscreen, out.pos, defont, buf, S);
 		}
 	}
+	unlock(&screenlock);
 }
 
 int
diff --git a/pc/u.h b/pc/u.h
index 81dfccf482a2af1e3a96426b21223e1c14af86d6..c6367e3fd7f95de2125bbd3732eed57e8a5d14ae 100644
--- a/pc/u.h
+++ b/pc/u.h
@@ -3,6 +3,7 @@ typedef	unsigned char	uchar;
 typedef unsigned long	ulong;
 typedef	long		vlong;
 typedef union Length	Length;
+typedef ushort		Rune;
 
 union Length
 {
diff --git a/pc/vga.c b/pc/vga.c
index 43287b74c85788d237e8254700ea7d5ffd24f5d2..062d96e79c903827ddee77157e8d74cb03ac56ea 100644
--- a/pc/vga.c
+++ b/pc/vga.c
@@ -193,42 +193,53 @@ screeninit(void)
 }
 
 void
-screenputc(int c)
+screenputnl(void)
 {
-	char buf[2];
-	int nx;
-
-	if(c == '\n'){
-		out.pos.x = MINX;
-		out.pos.y += defont0.height;
-		if(out.pos.y > gscreen.r.max.y-defont0.height)
-			out.pos.y = gscreen.r.min.y;
-		gbitblt(&gscreen, Pt(0, out.pos.y), &gscreen,
-		    Rect(0, out.pos.y, gscreen.r.max.x, out.pos.y+2*defont0.height), flipD[0]);
-	}else if(c == '\t'){
-		out.pos.x += (8-((out.pos.x-MINX)/out.bwid&7))*out.bwid;
-		if(out.pos.x >= gscreen.r.max.x)
-			screenputc('\n');
-	}else if(c == '\b'){
-		if(out.pos.x >= out.bwid+MINX){
-			out.pos.x -= out.bwid;
-			screenputc(' ');
-			out.pos.x -= out.bwid;
-		}
-	}else{
-		if(out.pos.x >= gscreen.r.max.x-out.bwid)
-			screenputc('\n');
-		buf[0] = c&0x7F;
-		buf[1] = 0;
-		out.pos = gstring(&gscreen, out.pos, defont, buf, flipD[S]);
-	}
+	out.pos.x = MINX;
+	out.pos.y += defont0.height;
+	if(out.pos.y > gscreen.r.max.y-defont0.height)
+		out.pos.y = gscreen.r.min.y;
+	gbitblt(&gscreen, Pt(0, out.pos.y), &gscreen,
+	    Rect(0, out.pos.y, gscreen.r.max.x, out.pos.y+2*defont0.height), flipD[0]);
 }
 
 void
 screenputs(char *s, int n)
 {
-	while(n-- > 0)
-		screenputc(*s++);
+	Rune r;
+	int i;
+	char buf[4];
+
+	lock(&printq);
+	while(n > 0){
+		i = chartorune(&r, s);
+		if(i == 0){
+			s++;
+			--n;
+			continue;
+		}
+		memmove(buf, s, i);
+		buf[i] = 0;
+		n -= i;
+		s += i;
+		if(r == '\n')
+			screenputnl();
+		else if(r == '\t'){
+			out.pos.x += (8-((out.pos.x-MINX)/out.bwid&7))*out.bwid;
+			if(out.pos.x >= gscreen.r.max.x)
+				screenputnl();
+		}else if(r == '\b'){
+			if(out.pos.x >= out.bwid+MINX){
+				out.pos.x -= out.bwid;
+				gstring(&gscreen, out.pos, defont, " ", flipD[S]);
+			}
+		}else{
+			if(out.pos.x >= gscreen.r.max.x-out.bwid)
+				screenputnl();
+			out.pos = gstring(&gscreen, out.pos, defont, buf, flipD[S]);
+		}
+	}
+	unlock(&printq);
 }
 
 int
diff --git a/port/devdk.c b/port/devdk.c
index c9160704bd360d16224340d8ccb29fd8e6bedc31..1a26bac108e7fb115fd29173ebbf73fdcef6c32b 100644
--- a/port/devdk.c
+++ b/port/devdk.c
@@ -159,12 +159,12 @@ enum {
 };
 char* dkerr[]={
 	[DKok]"",
-	[DKbusy]"host overloaded",
+	[DKbusy]"destination busy",
 	[DKnetotl]"network not answering",
-	[DKdestotl]"host not answering",
+	[DKdestotl]"destination not answering",
 	[DKbadnet]"unknown address",
-	[DKnetbusy]"network overloaded",
-	[DKinuse]"server in use",
+	[DKnetbusy]"network busy",
+	[DKinuse]"service in use",
 	[DKreject]"connection refused", 
 };
 #define DKERRS sizeof(dkerr)/sizeof(char*)
diff --git a/ss/screen.c b/ss/screen.c
index d7a3996d2fd019ff6ecbda5c78721101d0cbcf9d..6c94941d6ac55035112e9c4ed198d4da8f998698 100644
--- a/ss/screen.c
+++ b/ss/screen.c
@@ -33,6 +33,8 @@ GBitmap	gscreen =
 	0
 };
 
+Lock screenlock;
+
 void
 screeninit(void)
 {
@@ -43,6 +45,17 @@ screeninit(void)
 	out.bwid = defont0.info[' '].width;
 }
 
+void
+screenputnl(void)
+{
+	out.pos.x = MINX;
+	out.pos.y += defont0.height;
+	if(out.pos.y > gscreen.r.max.y-defont0.height)
+		out.pos.y = gscreen.r.min.y;
+	gbitblt(&gscreen, Pt(0, out.pos.y), &gscreen,
+	    Rect(0, out.pos.y, gscreen.r.max.x, out.pos.y+2*defont0.height), 0);
+}
+
 void
 screenputs(char *s, int n)
 {
@@ -50,6 +63,7 @@ screenputs(char *s, int n)
 	int i;
 	char buf[4];
 
+	lock(&screenlock);
 	while(n > 0){
 		i = chartorune(&r, s);
 		if(i == 0){
@@ -61,29 +75,24 @@ screenputs(char *s, int n)
 		buf[i] = 0;
 		n -= i;
 		s += i;
-		if(r == '\n'){
-			out.pos.x = MINX;
-			out.pos.y += defont0.height;
-			if(out.pos.y > gscreen.r.max.y-defont0.height)
-				out.pos.y = gscreen.r.min.y;
-			gbitblt(&gscreen, Pt(0, out.pos.y), &gscreen,
-			    Rect(0, out.pos.y, gscreen.r.max.x, out.pos.y+2*defont0.height), 0);
-		}else if(r == '\t'){
+		if(r == '\n')
+			screenputnl();
+		else if(r == '\t'){
 			out.pos.x += (8-((out.pos.x-MINX)/out.bwid&7))*out.bwid;
 			if(out.pos.x >= gscreen.r.max.x)
-				screenputs("\n", 1);
+				screenputnl();
 		}else if(r == '\b'){
 			if(out.pos.x >= out.bwid+MINX){
 				out.pos.x -= out.bwid;
-				screenputs(" ", 1);
-				out.pos.x -= out.bwid;
+				gstring(&gscreen, out.pos, defont, " ", S);
 			}
 		}else{
 			if(out.pos.x >= gscreen.r.max.x-out.bwid)
-				screenputs("\n", 1);
+				screenputnl();
 			out.pos = gstring(&gscreen, out.pos, defont, buf, S);
 		}
 	}
+	unlock(&screenlock);
 }
 
 /*