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/*
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 * pANS stdio -- fflush
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 */
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#include "iolib.h"
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/*
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 * pANS stdio -- data (put here, since loader won't load a separate file)
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 */
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FILE _IO_stream[]={
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/*	fd	flags	state	buf	rp	wp	lp	bufl	unbuf */
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	0,	0,	OPEN,	0,	0,	0,	0,	0,	0,
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	1,	0,	OPEN,	0,	0,	0,	0,	0,	0,
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	2,	0,	OPEN,	0,	0,	0,	0,	0,	0,
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};
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int _fflush(FILE *f){
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	int error, cnt;
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	if(f==NULL){
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		error=0;
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		for(f=_IO_stream;f!=&_IO_stream[FOPEN_MAX];f++)
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			if(f->state==WR && _fflush(f)==EOF)
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				error=EOF;
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		return error;
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	}
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	if(f->flags&STRING) return EOF;
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	switch(f->state){
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	default:	/* OPEN RDWR EOF RD */
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		return 0;
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	case CLOSED:
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	case ERR:
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		return EOF;
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	case WR:
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		cnt=(f->flags&LINEBUF?f->lp:f->wp)-f->buf;
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		if(cnt && write(f->fd, f->buf, cnt)!=cnt){
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			f->state=ERR;
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			return EOF;
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		}
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		f->rp=f->wp=f->buf;
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		f->state=RDWR;
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		return 0;
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	}
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}
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int fflush(FILE *f)
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{
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	int r;
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	qlock(&_stdiolk);
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	r = _fflush(f);
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	qunlock(&_stdiolk);
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	return r;
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}