/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ /* * pANS stdio -- setvbuf */#include "iolib.h"#include <stdlib.h>int setvbuf(FILE *f, char *buf, int mode, size_t size){	if(f->state!=OPEN){		f->state=ERR;		return -1;	}	f->state=RDWR;	switch(mode){	case _IOLBF:		f->flags|=LINEBUF;	case _IOFBF:		if(buf==0){			buf=malloc(size);			if(buf==0){				f->state=ERR;				return -1;			}			f->flags|=BALLOC;		}		f->bufl=size;		break;	case _IONBF:		buf=f->unbuf;		f->bufl=0;		break;	}	f->rp=f->wp=f->lp=f->buf=buf;	f->state=RDWR;	return 0;}int _IO_setvbuf(FILE *f){	if(f==stderr || (f==stdout && isatty(1)))		return setvbuf(f, (char *)0, _IOLBF, BUFSIZ);	return setvbuf(f, (char *)0, _IOFBF, BUFSIZ);}