Add scat. Temporary fix to rc r.e. note groups.

src/cmd/scat/display.c

@@ -0,0 +1,88 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <draw.h>
+#include "sky.h"
+
+void
+displaypic(Picture *pic)
+{
+	int p[2];
+	int i, n;
+	uchar *a;
+	
+
+	if(pipe(p) < 0){
+		fprint(2, "pipe failed: %r\n");
+		return;
+	}
+	switch(rfork(RFPROC|RFFDG)){
+	case -1:
+		fprint(2, "fork failed: %r\n");
+		return;
+
+	case 0:
+		close(p[1]);
+		dup(p[0], 0);
+		close(p[0]);
+	//	execl("/bin/page", "page", "-w", 0);
+		execlp("img", "img", 0);
+		fprint(2, "exec failed: %r\n");
+		exits("exec");
+
+	default:
+		close(p[0]);
+		fprint(p[1], "%11s %11d %11d %11d %11d ",
+			"k8", pic->minx, pic->miny, pic->maxx, pic->maxy);
+		n = (pic->maxx-pic->minx)*(pic->maxy-pic->miny);
+		/* release the memory as we hand it off; this could be a big piece of data */
+		a = pic->data;
+		while(n > 0){
+			i = 8192 - (((int)a)&8191);
+			if(i > n)
+				i = n;
+			if(write(p[1], a, i)!=i)
+				fprint(2, "write error: %r\n");
+		//	if(i == 8192)	/* page aligned */
+		//		segfree(a, i);
+			n -= i;
+			a += i;
+		}
+		free(pic->data);
+		free(pic);
+		close(p[1]);
+		break;
+	}
+}
+
+void
+displayimage(Image *im)
+{
+	int p[2];	
+
+	if(pipe(p) < 0){
+		fprint(2, "pipe failed: %r\n");
+		return;
+	}
+	switch(rfork(RFPROC|RFFDG)){
+	case -1:
+		fprint(2, "fork failed: %r\n");
+		return;
+
+	case 0:
+		close(p[1]);
+		dup(p[0], 0);
+		close(p[0]);
+		execlp("img", "img", 0);
+	//	execl("/bin/page", "page", "-w", 0);
+		fprint(2, "exec failed: %r\n");
+		exits("exec");
+
+	default:
+		close(p[0]);
+		writeimage(p[1], im, 0);
+		freeimage(im);
+		close(p[1]);
+		break;
+	}
+}