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File: [cvs.NetBSD.org] / src / lib / libc / citrus / citrus_memstream.h (download)

Revision 1.3, Sat May 14 17:55:42 2005 UTC (15 years ago) by tshiozak
Branch: MAIN
CVS Tags: yamt-pf42-baseX, yamt-pf42-base4, yamt-pf42-base3, yamt-pf42-base2, yamt-pf42-base, yamt-pf42, yamt-pagecache-tag8, yamt-pagecache-base9, yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, yamt-pagecache-base5, yamt-pagecache-base4, yamt-pagecache-base3, yamt-pagecache-base2, yamt-pagecache-base, yamt-pagecache, wrstuden-revivesa-base-3, wrstuden-revivesa-base-2, wrstuden-revivesa-base-1, wrstuden-revivesa-base, wrstuden-revivesa, wrstuden-fixsa-newbase, wrstuden-fixsa-base-1, wrstuden-fixsa-base, wrstuden-fixsa, tls-maxphys-base, tls-maxphys, tls-earlyentropy-base, tls-earlyentropy, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, phil-wifi-base, phil-wifi-20200421, phil-wifi-20200411, phil-wifi-20200406, phil-wifi-20191119, phil-wifi-20190609, phil-wifi, pgoyette-localcount-base, pgoyette-localcount-20170426, pgoyette-localcount-20170320, pgoyette-localcount-20170107, pgoyette-localcount-20161104, pgoyette-localcount-20160806, pgoyette-localcount-20160726, pgoyette-localcount, pgoyette-compat-merge-20190127, pgoyette-compat-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, netbsd-9-base, netbsd-9-0-RELEASE, netbsd-9-0-RC2, netbsd-9-0-RC1, netbsd-9, netbsd-8-base, netbsd-8-2-RELEASE, netbsd-8-1-RELEASE, netbsd-8-1-RC1, netbsd-8-0-RELEASE, netbsd-8-0-RC2, netbsd-8-0-RC1, netbsd-8, netbsd-7-nhusb-base-20170116, netbsd-7-nhusb-base, netbsd-7-nhusb, netbsd-7-base, netbsd-7-2-RELEASE, netbsd-7-1-RELEASE, netbsd-7-1-RC2, netbsd-7-1-RC1, netbsd-7-1-2-RELEASE, netbsd-7-1-1-RELEASE, netbsd-7-1, netbsd-7-0-RELEASE, netbsd-7-0-RC3, netbsd-7-0-RC2, netbsd-7-0-RC1, netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE, netbsd-7-0, netbsd-7, netbsd-6-base, netbsd-6-1-RELEASE, netbsd-6-1-RC4, netbsd-6-1-RC3, netbsd-6-1-RC2, netbsd-6-1-RC1, netbsd-6-1-5-RELEASE, netbsd-6-1-4-RELEASE, netbsd-6-1-3-RELEASE, netbsd-6-1-2-RELEASE, netbsd-6-1-1-RELEASE, netbsd-6-1, netbsd-6-0-RELEASE, netbsd-6-0-RC2, netbsd-6-0-RC1, netbsd-6-0-6-RELEASE, netbsd-6-0-5-RELEASE, netbsd-6-0-4-RELEASE, netbsd-6-0-3-RELEASE, netbsd-6-0-2-RELEASE, netbsd-6-0-1-RELEASE, netbsd-6-0, netbsd-6, netbsd-5-base, netbsd-5-2-RELEASE, netbsd-5-2-RC1, netbsd-5-2-3-RELEASE, netbsd-5-2-2-RELEASE, netbsd-5-2-1-RELEASE, netbsd-5-2, netbsd-5-1-RELEASE, netbsd-5-1-RC4, netbsd-5-1-RC3, netbsd-5-1-RC2, netbsd-5-1-RC1, netbsd-5-1-5-RELEASE, netbsd-5-1-4-RELEASE, netbsd-5-1-3-RELEASE, netbsd-5-1-2-RELEASE, netbsd-5-1-1-RELEASE, netbsd-5-1, netbsd-5-0-RELEASE, netbsd-5-0-RC4, netbsd-5-0-RC3, netbsd-5-0-RC2, netbsd-5-0-RC1, netbsd-5-0-2-RELEASE, netbsd-5-0-1-RELEASE, netbsd-5-0, netbsd-5, netbsd-4-base, netbsd-4-0-RELEASE, netbsd-4-0-RC5, netbsd-4-0-RC4, netbsd-4-0-RC3, netbsd-4-0-RC2, netbsd-4-0-RC1, netbsd-4-0-1-RELEASE, netbsd-4-0, netbsd-4, mjf-devfs2-base, mjf-devfs2, matt-premerge-20091211, matt-nb8-mediatek-base, matt-nb8-mediatek, matt-nb6-plus-nbase, matt-nb6-plus-base, matt-nb6-plus, matt-nb5-pq3-base, matt-nb5-pq3, matt-nb5-mips64-u2-k2-k4-k7-k8-k9, matt-nb5-mips64-u1-k1-k5, matt-nb5-mips64-premerge-20101231, matt-nb5-mips64-premerge-20091211, matt-nb5-mips64-k15, matt-nb5-mips64, matt-nb4-mips64-k7-u2a-k9b, matt-mips64-premerge-20101231, matt-mips64-base2, matt-mips64-base, matt-mips64, matt-armv6-prevmlocking, matt-armv6-nbase, matt-armv6-base, matt-armv6, localcount-20160914, keiichi-mipv6-base, keiichi-mipv6, jym-xensuspend-nbase, jym-xensuspend-base, jym-xensuspend, is-mlppp-base, is-mlppp, hpcarm-cleanup-nbase, hpcarm-cleanup-base, hpcarm-cleanup, cube-autoconf-base, cube-autoconf, christos-time_t-nbase, christos-time_t-base, christos-time_t, cherry-xenmp-base, cherry-xenmp, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan, bouyer-quota2-nbase, bouyer-quota2-base, bouyer-quota2, agc-symver-base, agc-symver, abandoned-netbsd-4-base, abandoned-netbsd-4, HEAD
Changes since 1.2: +40 -2 lines

* add some comments.
* add some functions:
   _citrus_memory_stream_bind_ptr()
   _citrus_memory_stream_tell()
   _citrus_memory_stream_ungetc()
   _citrus_region_get_subregion()
* fix a bug in _citrus_memory_stream_seek().

/*	$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 = _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, __UNCONST(ptr), sz);

	return ptr == NULL;
}

#endif