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/* Copyright (C) 2008 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 2, or (at your option)
any later version.
In addition to the permissions in the GNU General Public License, the
Free Software Foundation gives you unlimited permission to link the
compiled version of this file into combinations with other programs,
and to distribute those combinations without any restriction coming
from the use of this file. (The General Public License restrictions
do apply in other respects; for example, they cover modification of
the file, and distribution when not linked into a combine
executable.)
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.
You should have received a copy of the GNU General Public License
along with Libgfortran; see the file COPYING. If not, write to
the Free Software Foundation, 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#include "io.h"
#include <string.h>
#include <stdlib.h>
void
fbuf_init (gfc_unit * u, size_t len)
{
if (len == 0)
len = 4096; /* Default size one page. */
u->fbuf = get_mem (sizeof (fbuf));
u->fbuf->buf = u->fbuf->ptr = get_mem (len);
u->fbuf->len = len;
u->fbuf->act = u->fbuf->flushed = 0;
}
void
fbuf_reset (gfc_unit * u)
{
u->fbuf->act = u->fbuf->flushed = 0;
u->fbuf->ptr = u->fbuf->buf;
}
void
fbuf_destroy (gfc_unit * u)
{
if (u->fbuf == NULL)
return;
if (u->fbuf->buf)
free_mem (u->fbuf->buf);
free_mem (u->fbuf);
}
/* Return a pointer to the current position in the buffer, and increase
the pointer by len. Makes sure that the buffer is big enough,
reallocating if necessary. */
char *
fbuf_alloc (gfc_unit * u, size_t len)
{
size_t newlen, ptrpos;
char *dest;
if (u->fbuf->ptr + len > u->fbuf->buf + u->fbuf->len)
{
/* Round up to nearest multiple of the current buffer length. */
ptrpos = u->fbuf->ptr - u->fbuf->buf;
newlen = ((ptrpos + len) / u->fbuf->len + 1) * u->fbuf->len;
dest = realloc (u->fbuf->buf, newlen);
if (dest == NULL)
return NULL;
u->fbuf->buf = dest;
u->fbuf->ptr = dest + ptrpos;
u->fbuf->len = newlen;
}
dest = u->fbuf->ptr;
u->fbuf->ptr += len;
if ((size_t) (u->fbuf->ptr - u->fbuf->buf) > u->fbuf->act)
u->fbuf->act = u->fbuf->ptr - u->fbuf->buf;
return dest;
}
int
fbuf_flush (gfc_unit * u, int record_done)
{
int status;
size_t nbytes;
if (!u->fbuf)
return 0;
if (u->fbuf->act - u->fbuf->flushed != 0)
{
if (record_done)
nbytes = u->fbuf->act - u->fbuf->flushed;
else
nbytes = u->fbuf->ptr - u->fbuf->buf - u->fbuf->flushed;
status = swrite (u->s, u->fbuf->buf + u->fbuf->flushed, &nbytes);
u->fbuf->flushed += nbytes;
}
else
status = 0;
if (record_done)
fbuf_reset (u);
return status;
}
int
fbuf_seek (gfc_unit * u, gfc_offset off)
{
gfc_offset pos = u->fbuf->ptr - u->fbuf->buf + off;
if (pos < 0)
return -1;
u->fbuf->ptr = u->fbuf->buf + pos;
if (pos > u->fbuf->act)
u->fbuf->act = pos;
return 0;
}
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