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/*
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 * pANS stdio -- setvbuf
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 */
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#include "iolib.h"
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#include <stdlib.h>
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int setvbuf(FILE *f, char *buf, int mode, size_t size){
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	if(f->state!=OPEN){
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		f->state=ERR;
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		return -1;
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	}
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	f->state=RDWR;
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	switch(mode){
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	case _IOLBF:
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		f->flags|=LINEBUF;
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	case _IOFBF:
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		if(buf==0){
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			buf=malloc(size);
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			if(buf==0){
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				f->state=ERR;
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				return -1;
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			}
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			f->flags|=BALLOC;
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		}
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		f->bufl=size;
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		break;
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	case _IONBF:
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		buf=f->unbuf;
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		f->bufl=0;
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		break;
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	}
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	f->rp=f->wp=f->lp=f->buf=buf;
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	f->state=RDWR;
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	return 0;
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}
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int _IO_setvbuf(FILE *f){
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	if(f==stderr || (f==stdout && isatty(1)))
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		return setvbuf(f, (char *)0, _IOLBF, BUFSIZ);
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	return setvbuf(f, (char *)0, _IOFBF, BUFSIZ);
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}