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/* Copyright (C) 2009-2022 Free Software Foundation, Inc.
Contributed by Janne Blomqvist
This file is part of the GNU Fortran runtime library (libgfortran).
Libgfortran is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
Libgfortran is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#ifndef GFOR_FBUF_H
#define GFOR_FBUF_H
#include "io.h"
/* Formatting buffer. This is a temporary scratch buffer used by
formatted read and writes. After every formatted I/O statement,
this buffer is flushed. This buffer is needed since not all devices
are seekable, and T or TL edit descriptors require moving backwards
in the record. However, advance='no' complicates the situation, so
the buffer must only be partially flushed from the end of the last
flush until the current position in the record. */
struct fbuf
{
char *buf; /* Start of buffer. */
size_t len; /* Length of buffer. */
size_t act; /* Active bytes in buffer. */
size_t pos; /* Current position in buffer. */
};
extern void fbuf_init (gfc_unit *, size_t);
internal_proto(fbuf_init);
extern void fbuf_destroy (gfc_unit *);
internal_proto(fbuf_destroy);
extern ptrdiff_t fbuf_reset (gfc_unit *);
internal_proto(fbuf_reset);
extern char *fbuf_alloc (gfc_unit *, size_t);
internal_proto(fbuf_alloc);
extern int fbuf_flush (gfc_unit *, unit_mode);
internal_proto(fbuf_flush);
extern int fbuf_flush_list (gfc_unit *, unit_mode);
internal_proto(fbuf_flush_list);
extern ptrdiff_t fbuf_seek (gfc_unit *, ptrdiff_t, int);
internal_proto(fbuf_seek);
extern char *fbuf_read (gfc_unit *, size_t *);
internal_proto(fbuf_read);
/* Never call this function, only use fbuf_getc(). */
extern int fbuf_getc_refill (gfc_unit *);
internal_proto(fbuf_getc_refill);
static inline int
fbuf_getc (gfc_unit *u)
{
if (u->fbuf->pos < u->fbuf->act)
return (unsigned char) u->fbuf->buf[u->fbuf->pos++];
return fbuf_getc_refill (u);
}
static inline char *
fbuf_getptr (gfc_unit *u)
{
return (char*) (u->fbuf->buf + u->fbuf->pos);
}
#endif
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