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/***********************************************************************/
/* */
/* Objective Caml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* Automatique. Distributed only by permission. */
/* */
/***********************************************************************/
/* $Id$ */
/* Buffered input/output */
#ifndef _io_
#define _io_
#include "misc.h"
#include "mlvalues.h"
#ifndef IO_BUFFER_SIZE
#define IO_BUFFER_SIZE 4096
#endif
struct channel {
value final_fun; /* Finalization function */
int fd; /* Unix file descriptor */
long offset; /* Absolute position of fd in the file */
char * end; /* Physical end of the buffer */
char * curr; /* Current position in the buffer */
char * max; /* Logical end of the buffer (for input) */
char buff[IO_BUFFER_SIZE]; /* The buffer itself */
};
/* For an output channel:
[offset] is the absolute position of the beginning of the buffer [buff].
For an input channel:
[offset] is the absolute position of the logical end of the buffer, [max].
*/
#define putch(channel, ch) \
{ if ((channel)->curr >= (channel)->end) flush_partial(channel); \
*((channel)->curr)++ = (ch); }
#define getch(channel) \
((channel)->curr >= (channel)->max \
? refill(channel) \
: (unsigned char) *((channel))->curr++)
struct channel * open_descr P((int));
value close_channel P((struct channel *));
value flush_partial P((struct channel *));
value flush P((struct channel *));
void putword P((struct channel *, uint32));
int putblock P((struct channel *, char *, long));
void really_putblock P((struct channel *, char *, long));
unsigned char refill P((struct channel *));
uint32 getword P((struct channel *));
int getblock P((struct channel *, char *, long));
int really_getblock P((struct channel *, char *, long));
#endif /* _io_ */
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