ungetc.c

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/* Copyright (c) Colorado School of Mines, 2006.*/
/* All rights reserved.                       */

#include	"sfstdio.h"

/*	Put back an input byte.
**	Written by Kiem-Phong Vo
*/

#if __STD_C
int ungetc(int c, FILE* f)
#else
int ungetc(c,f)
reg int		c;
reg FILE*	f;
#endif
{
	reg Sfio_t*	sf;

	if(!(sf = _sfstream(f)))
		return -1;

	return sfungetc(sf,c);
}