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uhtml: use IOUNIT for transfer block size

--- a/sys/src/cmd/uhtml.c

+++ b/sys/src/cmd/uhtml.c

@@ -3,7 +3,7 @@

 #include <ctype.h>

 int nbuf;

-char buf[64*1024+1];

+char buf[IOUNIT+1];

 char *cset = nil;

 char *whitespace = " \t\r\n";

@@ -180,7 +180,7 @@

 		if(write(1, p, nbuf) != nbuf)

 			sysfatal("write: %r");

 		p = buf;

-		if((nbuf = read(0, p, sizeof(buf))) < 0)

+		if((nbuf = read(0, p, sizeof(buf)-1)) < 0)

 			sysfatal("read: %r");

 	}

 	close(1);