ref: 153b1669465b07cb8ebe63194745ee5aad18a948
dir: /sys/src/cmd/postscript/p9bitpost/pslib.h/
char *psinit(int, int); /* second arg is debug flag; returns "" on success */ int image2psfile(int, Memimage*, int); void psopt(char *, void *); int paperlength; int paperwidth;