substdio.h

/*
 * $Log: substdio.h,v $
 * Revision 1.1  2014-08-23 09:07:30+05:30  Cprogrammer
 * Initial revision
 *
 *
 */
#ifndef SUBSTDIO_H
#define SUBSTDIO_H
#include <sys/types.h>

typedef struct substdio
{
	char           *x;
	int             p;
	int             n;
	int             fd;
	ssize_t         (*op) ();
}
substdio;

#define SUBSTDIO_FDBUF(op,fd,buf,len) { (buf), 0, (len), (fd), (op) }

void            substdio_fdbuf(substdio *, ssize_t (*op) (), int, char *, int);
int             substdio_flush(substdio *);
int             substdio_putalign(substdio *,char *,unsigned int);
int             substdio_put(substdio *, char *, int);
int             substdio_bput(substdio *, char *, int);
int             substdio_putflush(substdio *, char *, int);
int             substdio_puts(substdio *, char *);
int             substdio_bputs(substdio *, char *);
int             substdio_putsflush(substdio *, char *);
int             substdio_get(substdio *, char *, int);
int             substdio_bget(substdio *, char *, int);
int             substdio_feed(substdio *);
char           *substdio_peek(substdio *);
void            substdio_seek(substdio *, int);
int             substdio_copy(substdio *, substdio *);

#define substdio_fileno(s) ((s)->fd)

#define SUBSTDIO_INSIZE 8192
#define SUBSTDIO_OUTSIZE 8192

#define substdio_PEEK(s)     ((s)->x + (s)->n)
#define substdio_SEEK(s,len) (((s)->p -= (len)) , ((s)->n += (len)))

#define substdio_BPUTC(s,c) \
  (((s)->n != (s)->p) ? ((s)->x[(s)->p++] = (c), 0) : substdio_bput((s),&(c),1))

#endif