Initial revision

src/libdraw/readcolmap.c

@@ -0,0 +1,49 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <bio.h>
+
+static ulong
+getval(char **p)
+{
+	ulong v;
+	char *q;
+
+	v = strtoul(*p, &q, 0);
+	v |= v<<8;
+	v |= v<<16;
+	*p = q;
+	return v;
+}
+
+void
+readcolmap(Display *d, RGB *colmap)
+{
+	int i;
+	char *p, *q;
+	Biobuf *b;
+	char buf[128];
+
+	USED(screen);
+
+	sprint(buf, "/dev/draw/%d/colormap", d->dirno);
+	b = Bopen(buf, OREAD);
+	if(b == 0)
+		drawerror(d, "rdcolmap: can't open colormap device");
+
+	for(;;) {
+		p = Brdline(b, '\n');
+		if(p == 0)
+			break;
+		i = strtoul(p, &q, 0);
+		if(i < 0 || i > 255) {
+			fprint(2, "rdcolmap: bad index\n");
+			exits("bad");
+		}
+		p = q;
+		colmap[255-i].red = getval(&p);
+		colmap[255-i].green = getval(&p);
+		colmap[255-i].blue = getval(&p);
+	}
+	Bterm(b);
+}