Plan 9 from Bell Labs’s /usr/web/sources/contrib/steve/root/sys/src/cmd/tex/tpic/libtex/sbox.c
#include "tex.h" sbox(x0, y0, x1, y1) double x0, y0, x1, y1; { fprintf(TEXFILE," \\special{bk}%%\n"); box(x0, y0, x1, y1); }