1 .ds Bf b		\" default format; use i for icons and faces
2 .ds Bn /tmp/btroff\n($$	\" temporary file, reused on each macro call
3 .ds Bp /usr/lib/btroff	\" bitmap filter
4 .de BM
5 .if \\n(.$=1 .ds Bf \\$1
6 .if \\n(.$=2 \{.	\" copy request, perhaps diverted
7 .ie '\\n(.z'' .Bm \\$1 \\$2
8 .el \!.BM \\$1 \\$2\}
9 .if \\n(.$=4 \{.	\" size request, numerator only
10 .nr Bz \\$2
11 .sy \\*(Bp -s -\\*(Bf -d\\n(Bz \\$1 | awk '{\
12 	print ".nr \\$3 " $1; \
13 	print ".nr \\$4 " $2; \
14 	exit }' >\\*(Bn
15 .so \\*(Bn
16 .sy /bin/rm -f \\*(Bn \}
17 .if \\n(.$=5 \{.	\" size request, numerator and denominator
18 .nr Bz \\$2
19 .sy \\*(Bp -s -\\*(Bf -d\\n(Bz \\$1 | awk '{\
20 	print ".nr \\$4 " $1 "/\\$3"; \
21 	print ".nr \\$5 " $2 "/\\$3"; \
22 	exit }' >\\*(Bn
23 .so \\*(Bn
24 .sy /bin/rm -f \\*(Bn \}
25 ..
26 .de Bm			\" copy request, for real
27 .if \\n(.P>0 \{.	\" maybe
28 .fl
29 .ie '\\$2'0' \{.	\" ask driver to read the bits
30 .br
31 \\X'Bitmap \\$1'
32 .sp -1 \}
33 .el \{.			\" use the Bitmap font
34 .sy \\*(Bp -\\*(Bf -d\\$2 \\$1 >\\*(Bn
35 .fp 9 BM Bitmap
36 .ft 9
37 .ps \\$2
38 .cf \\*(Bn	\" next line is for pm to consume
39 \!n0 1
40 .ft
41 .ps
42 .sy /bin/rm -f \\*(Bn \}
43 .fl \}
44 ..