90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
/* Copyright (C) 2009-2019 Free Software Foundation, Inc.
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Contributed by Janne Blomqvist
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This file is part of the GNU Fortran runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef GFOR_FBUF_H
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#define GFOR_FBUF_H
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#include "io.h"
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/* Formatting buffer. This is a temporary scratch buffer used by
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formatted read and writes. After every formatted I/O statement,
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this buffer is flushed. This buffer is needed since not all devices
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are seekable, and T or TL edit descriptors require moving backwards
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in the record. However, advance='no' complicates the situation, so
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the buffer must only be partially flushed from the end of the last
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flush until the current position in the record. */
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struct fbuf
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{
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char *buf; /* Start of buffer. */
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size_t len; /* Length of buffer. */
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size_t act; /* Active bytes in buffer. */
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size_t pos; /* Current position in buffer. */
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};
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extern void fbuf_init (gfc_unit *, size_t);
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internal_proto(fbuf_init);
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extern void fbuf_destroy (gfc_unit *);
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internal_proto(fbuf_destroy);
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extern ptrdiff_t fbuf_reset (gfc_unit *);
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internal_proto(fbuf_reset);
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extern char *fbuf_alloc (gfc_unit *, size_t);
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internal_proto(fbuf_alloc);
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extern int fbuf_flush (gfc_unit *, unit_mode);
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internal_proto(fbuf_flush);
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extern int fbuf_flush_list (gfc_unit *, unit_mode);
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internal_proto(fbuf_flush_list);
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extern ptrdiff_t fbuf_seek (gfc_unit *, ptrdiff_t, int);
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internal_proto(fbuf_seek);
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extern char *fbuf_read (gfc_unit *, size_t *);
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internal_proto(fbuf_read);
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/* Never call this function, only use fbuf_getc(). */
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extern int fbuf_getc_refill (gfc_unit *);
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internal_proto(fbuf_getc_refill);
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static inline int
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fbuf_getc (gfc_unit *u)
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{
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if (u->fbuf->pos < u->fbuf->act)
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return (unsigned char) u->fbuf->buf[u->fbuf->pos++];
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return fbuf_getc_refill (u);
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}
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static inline char *
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fbuf_getptr (gfc_unit *u)
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{
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return (char*) (u->fbuf->buf + u->fbuf->pos);
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}
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#endif
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