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/*
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 * pANS stdio -- fseek
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 */
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#include "iolib.h"
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int fseek(FILE *f, long offs, int type){
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	switch(f->state){
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	case ERR:
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	case CLOSED:
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		return -1;
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	case WR:
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		fflush(f);
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		break;
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	case RD:
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		if(type==1 && f->buf!=f->unbuf)
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			offs-=f->wp-f->rp;
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		break;
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	}
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	if(f->flags&STRING || seek(f->fd, offs, type)==-1) return -1;
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	if(f->state==RD) f->rp=f->wp=f->buf;
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	if(f->state!=OPEN)
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		f->state=RDWR;
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	return 0;
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}