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 35 struct _citrus_memory_stream { 36 struct _citrus_region ms_region; 37 size_t ms_pos; 38 }; 39 40 __BEGIN_DECLS 41 const char *_citrus_memory_stream_getln( 42 struct _citrus_memory_stream * __restrict, 43 size_t * __restrict); 44 const char *_citrus_memory_stream_matchline( 45 struct _citrus_memory_stream * __restrict, 46 const char * __restrict, size_t * __restrict, int); 47 void *_citrus_memory_stream_chr(struct _citrus_memory_stream *, 48 struct _citrus_region *, char); 49 void _citrus_memory_stream_skip_ws(struct _citrus_memory_stream *); 50 __END_DECLS 51 52 static __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 59 static __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 68 static __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 78 static __inline void 79 _citrus_memory_stream_rewind(struct _citrus_memory_stream *ms) 80 { 81 82 ms->ms_pos = 0; 83 } 84 85 static __inline size_t 86 _citrus_memory_stream_tell(struct _citrus_memory_stream *ms) 87 { 88 89 return (ms->ms_pos); 90 } 91 92 static __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 } 102 103 static __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 } 130 131 static __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 } 139 140 static __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 } 147 148 static __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 } 156 157 static __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 } 173 174 static __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 } 186 187 static __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 } 199 200 static __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 } 212 213 static __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