Plan 9 from User Space's /usr/local/plan9/src/libdraw/debug.c

#include <u.h>
#include <libc.h>
#include <draw.h>

void
drawsetdebug(int v)
{
	uchar *a;
	a = bufimage(display, 1+1);
	if(a == 0){
		fprint(2, "drawsetdebug: %r\n");
		return;
	}
	a[0] = 'D';
	a[1] = v;
}

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Copyright © 2005 Lucent Technologies, Russ Cox, MIT.
See license for details.