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/* $FreeBSD$ */
/* $NetBSD: citrus_memstream.h,v 1.3 2005/05/14 17:55:42 tshiozak Exp $ */
/*-
* Copyright (c)2003 Citrus Project,
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#ifndef _CITRUS_MEMSTREAM_H_
#define _CITRUS_MEMSTREAM_H_
struct _citrus_memory_stream {
struct _citrus_region ms_region;
size_t ms_pos;
};
__BEGIN_DECLS
const char *_citrus_memory_stream_getln(
struct _citrus_memory_stream * __restrict,
size_t * __restrict);
const char *_citrus_memory_stream_matchline(
struct _citrus_memory_stream * __restrict,
const char * __restrict, size_t * __restrict, int);
void *_citrus_memory_stream_chr(struct _citrus_memory_stream *,
struct _citrus_region *, char);
void _citrus_memory_stream_skip_ws(struct _citrus_memory_stream *);
__END_DECLS
static __inline int
_citrus_memory_stream_iseof(struct _citrus_memory_stream *ms)
{
return (ms->ms_pos >= _citrus_region_size(&ms->ms_region));
}
static __inline void
_citrus_memory_stream_bind(struct _citrus_memory_stream * __restrict ms,
const struct _citrus_region * __restrict r)
{
ms->ms_region = *r;
ms->ms_pos = 0;
}
static __inline void
_citrus_memory_stream_bind_ptr(struct _citrus_memory_stream * __restrict ms,
void *ptr, size_t sz)
{
struct _citrus_region r;
_citrus_region_init(&r, ptr, sz);
_citrus_memory_stream_bind(ms, &r);
}
static __inline void
_citrus_memory_stream_rewind(struct _citrus_memory_stream *ms)
{
ms->ms_pos = 0;
}
static __inline size_t
_citrus_memory_stream_tell(struct _citrus_memory_stream *ms)
{
return (ms->ms_pos);
}
static __inline size_t
_citrus_memory_stream_remainder(struct _citrus_memory_stream *ms)
{
size_t sz;
sz = _citrus_region_size(&ms->ms_region);
if (ms->ms_pos>sz)
return (0);
return (sz-ms->ms_pos);
}
static __inline int
_citrus_memory_stream_seek(struct _citrus_memory_stream *ms, size_t pos, int w)
{
size_t sz;
sz = _citrus_region_size(&ms->ms_region);
switch (w) {
case SEEK_SET:
if (pos >= sz)
return (-1);
ms->ms_pos = pos;
break;
case SEEK_CUR:
pos += (ssize_t)ms->ms_pos;
if (pos >= sz)
return (-1);
ms->ms_pos = pos;
break;
case SEEK_END:
if (sz < pos)
return (-1);
ms->ms_pos = sz - pos;
break;
}
return (0);
}
static __inline int
_citrus_memory_stream_getc(struct _citrus_memory_stream *ms)
{
if (_citrus_memory_stream_iseof(ms))
return (EOF);
return (_citrus_region_peek8(&ms->ms_region, ms->ms_pos++));
}
static __inline void
_citrus_memory_stream_ungetc(struct _citrus_memory_stream *ms, int ch)
{
if (ch != EOF && ms->ms_pos > 0)
ms->ms_pos--;
}
static __inline int
_citrus_memory_stream_peek(struct _citrus_memory_stream *ms)
{
if (_citrus_memory_stream_iseof(ms))
return (EOF);
return (_citrus_region_peek8(&ms->ms_region, ms->ms_pos));
}
static __inline void *
_citrus_memory_stream_getregion(struct _citrus_memory_stream *ms,
struct _citrus_region *r, size_t sz)
{
void *ret;
if (ms->ms_pos + sz > _citrus_region_size(&ms->ms_region))
return (NULL);
ret = _citrus_region_offset(&ms->ms_region, ms->ms_pos);
ms->ms_pos += sz;
if (r)
_citrus_region_init(r, ret, sz);
return (ret);
}
static __inline int
_citrus_memory_stream_get8(struct _citrus_memory_stream *ms, uint8_t *rval)
{
if (ms->ms_pos + 1 > _citrus_region_size(&ms->ms_region))
return (-1);
*rval = _citrus_region_peek8(&ms->ms_region, ms->ms_pos);
ms->ms_pos += 2;
return (0);
}
static __inline int
_citrus_memory_stream_get16(struct _citrus_memory_stream *ms, uint16_t *rval)
{
if (ms->ms_pos + 2 > _citrus_region_size(&ms->ms_region))
return (-1);
*rval = _citrus_region_peek16(&ms->ms_region, ms->ms_pos);
ms->ms_pos += 2;
return (0);
}
static __inline int
_citrus_memory_stream_get32(struct _citrus_memory_stream *ms, uint32_t *rval)
{
if (ms->ms_pos + 4 > _citrus_region_size(&ms->ms_region))
return (-1);
*rval = _citrus_region_peek32(&ms->ms_region, ms->ms_pos);
ms->ms_pos += 4;
return (0);
}
static __inline int
_citrus_memory_stream_getln_region(struct _citrus_memory_stream *ms,
struct _citrus_region *r)
{
const char *ptr;
size_t sz;
ptr = _citrus_memory_stream_getln(ms, &sz);
if (ptr)
_citrus_region_init(r, __DECONST(void *, ptr), sz);
return (ptr == NULL);
}
#endif
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