/* * pANS stdio -- setbuf */#include "iolib.h"void setbuf(FILE *f, char *buf){	if(f->state==OPEN){		if(buf)			f->bufl=BUFSIZ;		else{			buf=f->unbuf;			f->bufl=0;		}		f->rp=f->wp=f->lp=f->buf=buf;		f->state=RDWR;	}	/* else error, but there's no way to report it */}