1/* $NetBSD: citrus_memstream.h,v 1.3 2005/05/14 17:55:42 tshiozak Exp $ */ 2 3/*- 4 * SPDX-License-Identifier: BSD-2-Clause 5 * 6 * Copyright (c)2003 Citrus Project, 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 */ 31 32#ifndef _CITRUS_MEMSTREAM_H_ 33#define _CITRUS_MEMSTREAM_H_ 34 35struct _citrus_memory_stream { 36 struct _citrus_region ms_region; 37 size_t ms_pos; 38}; 39 40__BEGIN_DECLS 41const char *_citrus_memory_stream_getln( 42 struct _citrus_memory_stream * __restrict, 43 size_t * __restrict); 44const char *_citrus_memory_stream_matchline( 45 struct _citrus_memory_stream * __restrict, 46 const char * __restrict, size_t * __restrict, int); 47void *_citrus_memory_stream_chr(struct _citrus_memory_stream *, 48 struct _citrus_region *, char); 49void _citrus_memory_stream_skip_ws(struct _citrus_memory_stream *); 50__END_DECLS 51 52static __inline int 53_citrus_memory_stream_iseof(struct _citrus_memory_stream *ms) 54{ 55 56 return (ms->ms_pos >= _citrus_region_size(&ms->ms_region)); 57} 58 59static __inline void 60_citrus_memory_stream_bind(struct _citrus_memory_stream * __restrict ms, 61 const struct _citrus_region * __restrict r) 62{ 63 64 ms->ms_region = *r; 65 ms->ms_pos = 0; 66} 67 68static __inline void 69_citrus_memory_stream_bind_ptr(struct _citrus_memory_stream * __restrict ms, 70 void *ptr, size_t sz) 71{ 72 struct _citrus_region r; 73 74 _citrus_region_init(&r, ptr, sz); 75 _citrus_memory_stream_bind(ms, &r); 76} 77 78static __inline void 79_citrus_memory_stream_rewind(struct _citrus_memory_stream *ms) 80{ 81 82 ms->ms_pos = 0; 83} 84 85static __inline size_t 86_citrus_memory_stream_tell(struct _citrus_memory_stream *ms) 87{ 88 89 return (ms->ms_pos); 90} 91 92static __inline size_t 93_citrus_memory_stream_remainder(struct _citrus_memory_stream *ms) 94{ 95 size_t sz; 96 97 sz = _citrus_region_size(&ms->ms_region); 98 if (ms->ms_pos>sz) 99 return (0); 100 return (sz-ms->ms_pos); 101} 102 103static __inline int 104_citrus_memory_stream_seek(struct _citrus_memory_stream *ms, size_t pos, int w) 105{ 106 size_t sz; 107 108 sz = _citrus_region_size(&ms->ms_region); 109 110 switch (w) { 111 case SEEK_SET: 112 if (pos >= sz) 113 return (-1); 114 ms->ms_pos = pos; 115 break; 116 case SEEK_CUR: 117 pos += (ssize_t)ms->ms_pos; 118 if (pos >= sz) 119 return (-1); 120 ms->ms_pos = pos; 121 break; 122 case SEEK_END: 123 if (sz < pos) 124 return (-1); 125 ms->ms_pos = sz - pos; 126 break; 127 } 128 return (0); 129} 130 131static __inline int 132_citrus_memory_stream_getc(struct _citrus_memory_stream *ms) 133{ 134 135 if (_citrus_memory_stream_iseof(ms)) 136 return (EOF); 137 return (_citrus_region_peek8(&ms->ms_region, ms->ms_pos++)); 138} 139 140static __inline void 141_citrus_memory_stream_ungetc(struct _citrus_memory_stream *ms, int ch) 142{ 143 144 if (ch != EOF && ms->ms_pos > 0) 145 ms->ms_pos--; 146} 147 148static __inline int 149_citrus_memory_stream_peek(struct _citrus_memory_stream *ms) 150{ 151 152 if (_citrus_memory_stream_iseof(ms)) 153 return (EOF); 154 return (_citrus_region_peek8(&ms->ms_region, ms->ms_pos)); 155} 156 157static __inline void * 158_citrus_memory_stream_getregion(struct _citrus_memory_stream *ms, 159 struct _citrus_region *r, size_t sz) 160{ 161 void *ret; 162 163 if (ms->ms_pos + sz > _citrus_region_size(&ms->ms_region)) 164 return (NULL); 165 166 ret = _citrus_region_offset(&ms->ms_region, ms->ms_pos); 167 ms->ms_pos += sz; 168 if (r) 169 _citrus_region_init(r, ret, sz); 170 171 return (ret); 172} 173 174static __inline int 175_citrus_memory_stream_get8(struct _citrus_memory_stream *ms, uint8_t *rval) 176{ 177 178 if (ms->ms_pos + 1 > _citrus_region_size(&ms->ms_region)) 179 return (-1); 180 181 *rval = _citrus_region_peek8(&ms->ms_region, ms->ms_pos); 182 ms->ms_pos += 2; 183 184 return (0); 185} 186 187static __inline int 188_citrus_memory_stream_get16(struct _citrus_memory_stream *ms, uint16_t *rval) 189{ 190 191 if (ms->ms_pos + 2 > _citrus_region_size(&ms->ms_region)) 192 return (-1); 193 194 *rval = _citrus_region_peek16(&ms->ms_region, ms->ms_pos); 195 ms->ms_pos += 2; 196 197 return (0); 198} 199 200static __inline int 201_citrus_memory_stream_get32(struct _citrus_memory_stream *ms, uint32_t *rval) 202{ 203 204 if (ms->ms_pos + 4 > _citrus_region_size(&ms->ms_region)) 205 return (-1); 206 207 *rval = _citrus_region_peek32(&ms->ms_region, ms->ms_pos); 208 ms->ms_pos += 4; 209 210 return (0); 211} 212 213static __inline int 214_citrus_memory_stream_getln_region(struct _citrus_memory_stream *ms, 215 struct _citrus_region *r) 216{ 217 const char *ptr; 218 size_t sz; 219 220 ptr = _citrus_memory_stream_getln(ms, &sz); 221 if (ptr) 222 _citrus_region_init(r, __DECONST(void *, ptr), sz); 223 224 return (ptr == NULL); 225} 226 227#endif 228