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/* * pANS stdio -- ungetc */#include "iolib.h"int ungetc(int c, FILE *f){	if(c==EOF) return EOF;	switch(f->state){	default:	/* WR */		f->state=ERR;		return EOF;	case CLOSED:	case ERR:		return EOF;	case OPEN:		_IO_setvbuf(f);	case RDWR:	case END:		f->rp=f->wp=f->buf+(f->bufl==0?1:f->bufl);		f->state=RD;	case RD:		if(f->rp==f->buf) return EOF;		if(f->flags&STRING)			f->rp--;		else			*--f->rp=c;		return (char)c;	}}