From 788c43963bdb98f2daa31144b45434ed4f748346 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Mon, 7 Dec 1992 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1992-12-07

---
 gnot/u.h      |  1 +
 pc/u.h        |  1 +
 port/devbit.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 power/u.h     |  1 +
 ss/u.h        |  1 +
 5 files changed, 55 insertions(+)

diff --git a/gnot/u.h b/gnot/u.h
index c6367e3fd7f95de2125bbd3732eed57e8a5d14ae..59f98d28fdd3c7f1e3aafecb214ffc8d631a78d0 100644
--- a/gnot/u.h
+++ b/gnot/u.h
@@ -1,5 +1,6 @@
 typedef	unsigned short	ushort;
 typedef	unsigned char	uchar;
+typedef	signed char	schar;
 typedef unsigned long	ulong;
 typedef	long		vlong;
 typedef union Length	Length;
diff --git a/pc/u.h b/pc/u.h
index c6367e3fd7f95de2125bbd3732eed57e8a5d14ae..59f98d28fdd3c7f1e3aafecb214ffc8d631a78d0 100644
--- a/pc/u.h
+++ b/pc/u.h
@@ -1,5 +1,6 @@
 typedef	unsigned short	ushort;
 typedef	unsigned char	uchar;
+typedef	signed char	schar;
 typedef unsigned long	ulong;
 typedef	long		vlong;
 typedef union Length	Length;
diff --git a/port/devbit.c b/port/devbit.c
index 87f5825ece858df137ceb7b267e11e2d1544d3ca..4a24b4b62b32211839aa20b3fecaea615cf8068c 100644
--- a/port/devbit.c
+++ b/port/devbit.c
@@ -980,6 +980,57 @@ bitwrite(Chan *c, void *va, long n, ulong offset)
 			p += 73;
 			break;
 
+		case 'e':
+			/*
+			 * polysegment
+			 *
+			 *	'e'		1
+			 *	id		2
+			 *	pt		8
+			 *	value		1
+			 *	code		2
+			 *	n		2
+			 *	pts		2*n
+			 */
+			if(m < 16)
+				error(Ebadblt);
+			l = BGSHORT(p+14);
+			if(m < 16+2*l)
+				error(Ebadblt);
+			v = BGSHORT(p+1);
+			if(v<0 || v>=bit.nmap || (dst=bit.map[v])==0)
+				error(Ebadbitmap);
+			off = 0;
+			fc = BGSHORT(p+12) & 0xF;
+			if(v == 0){
+				if(flipping)
+					fc = flipD[fc];
+				off = 1;
+			}
+			pt1.x = BGLONG(p+3);
+			pt1.y = BGLONG(p+7);
+			t = p[11];
+			if(off && !isoff){
+				cursoroff(1);
+				isoff = 1;
+			}
+			p += 16;
+			m -= 16;
+			while(l > 0){
+				pt2.x = pt1.x + (schar)p[0];
+				pt2.y = pt1.y + (schar)p[1];
+				gsegment(dst, pt1, pt2, t, fc);
+				if(dst->base < endscreen){
+					mbbpt(pt1);
+					mbbpt(pt2);
+				}
+				pt1 = pt2;
+				p += 2;
+				m -= 2;
+				l--;
+			}
+			break;
+
 		case 'f':
 			/*
 			 * free
diff --git a/power/u.h b/power/u.h
index e73f66c7aa18b0d670b3e8a7c9cda8e66a208e89..3a2341d26a2acc39c47cec77704815a65852c034 100644
--- a/power/u.h
+++ b/power/u.h
@@ -1,5 +1,6 @@
 typedef	unsigned short	ushort;
 typedef	unsigned char	uchar;
+typedef	signed char	schar;
 typedef unsigned long	ulong;
 typedef	long		vlong;
 typedef union Length	Length;
diff --git a/ss/u.h b/ss/u.h
index e4fcd0cd2db6f2b46e07210a968b7898e83c2476..edb76330f603dab56562d4ce1ce564f1da94a305 100644
--- a/ss/u.h
+++ b/ss/u.h
@@ -1,6 +1,7 @@
 typedef	unsigned int	uint;
 typedef	unsigned short	ushort;
 typedef	unsigned char	uchar;
+typedef	signed char	schar;
 typedef unsigned long	ulong;
 typedef	long		vlong;
 typedef union Length	Length;