1 /* $NetBSD: citrus_memstream.h,v 1.3 2005/05/14 17:55:42 tshiozak Exp $ */ 2 /* $DragonFly: src/lib/libc/citrus/citrus_memstream.h,v 1.3 2008/04/10 10:21:01 hasso Exp $ */ 3 4 /*- 5 * Copyright (c)2003 Citrus Project, 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 31 #ifndef _CITRUS_MEMSTREAM_H_ 32 #define _CITRUS_MEMSTREAM_H_ 33 34 struct _citrus_memory_stream { 35 struct _citrus_region ms_region; 36 size_t ms_pos; 37 }; 38 39 __BEGIN_DECLS 40 const char * _citrus_memory_stream_getln( 41 struct _citrus_memory_stream * __restrict, size_t * __restrict); 42 const char * _citrus_memory_stream_matchline( 43 struct _citrus_memory_stream * __restrict, const char * __restrict, 44 size_t * __restrict, int); 45 void * _citrus_memory_stream_chr(struct _citrus_memory_stream *, 46 struct _citrus_region *, char); 47 void _citrus_memory_stream_skip_ws(struct _citrus_memory_stream *); 48 __END_DECLS 49 50 static __inline int 51 _citrus_memory_stream_iseof(struct _citrus_memory_stream *ms) 52 { 53 return ms->ms_pos >= _citrus_region_size(&ms->ms_region); 54 } 55 56 static __inline void 57 _citrus_memory_stream_bind(struct _citrus_memory_stream * __restrict ms, 58 const struct _citrus_region * __restrict r) 59 { 60 ms->ms_region = *r; 61 ms->ms_pos = 0; 62 } 63 64 static __inline void 65 _citrus_memory_stream_bind_ptr(struct _citrus_memory_stream * __restrict ms, 66 void *ptr, size_t sz) 67 { 68 struct _citrus_region r; 69 70 _citrus_region_init(&r, ptr, sz); 71 _citrus_memory_stream_bind(ms, &r); 72 } 73 74 static __inline void 75 _citrus_memory_stream_rewind(struct _citrus_memory_stream *ms) 76 { 77 ms->ms_pos = 0; 78 } 79 80 static __inline size_t 81 _citrus_memory_stream_tell(struct _citrus_memory_stream *ms) 82 { 83 return ms->ms_pos; 84 } 85 86 static __inline size_t 87 _citrus_memory_stream_remainder(struct _citrus_memory_stream *ms) 88 { 89 size_t sz; 90 sz = _citrus_region_size(&ms->ms_region); 91 if (ms->ms_pos>sz) 92 return 0; 93 return sz-ms->ms_pos; 94 } 95 96 static __inline int 97 _citrus_memory_stream_seek(struct _citrus_memory_stream *ms, size_t pos, int w) 98 { 99 size_t sz = _citrus_region_size(&ms->ms_region); 100 switch (w) { 101 case SEEK_SET: 102 if (pos>=sz) 103 return -1; 104 ms->ms_pos = pos; 105 break; 106 case SEEK_CUR: 107 pos += (ssize_t)ms->ms_pos; 108 if (pos>=sz) 109 return -1; 110 ms->ms_pos = pos; 111 break; 112 case SEEK_END: 113 if (sz<pos) 114 return -1; 115 ms->ms_pos = sz - pos; 116 break; 117 } 118 return 0; 119 } 120 121 static __inline int 122 _citrus_memory_stream_getc(struct _citrus_memory_stream *ms) 123 { 124 if (_citrus_memory_stream_iseof(ms)) 125 return (EOF); 126 return _citrus_region_peek8(&ms->ms_region, ms->ms_pos++); 127 } 128 129 static __inline void 130 _citrus_memory_stream_ungetc(struct _citrus_memory_stream *ms, int ch) 131 { 132 if (ch != EOF && ms->ms_pos > 0) 133 ms->ms_pos--; 134 } 135 136 static __inline int 137 _citrus_memory_stream_peek(struct _citrus_memory_stream *ms) 138 { 139 if (_citrus_memory_stream_iseof(ms)) 140 return (EOF); 141 return _citrus_region_peek8(&ms->ms_region, ms->ms_pos); 142 } 143 144 static __inline void * 145 _citrus_memory_stream_getregion(struct _citrus_memory_stream *ms, 146 struct _citrus_region *r, size_t sz) 147 { 148 void *ret; 149 150 if (ms->ms_pos + sz > _citrus_region_size(&ms->ms_region)) 151 return NULL; 152 153 ret = _citrus_region_offset(&ms->ms_region, ms->ms_pos); 154 ms->ms_pos += sz; 155 if (r) 156 _citrus_region_init(r, ret, sz); 157 158 return ret; 159 } 160 161 static __inline int 162 _citrus_memory_stream_get8(struct _citrus_memory_stream *ms, uint8_t *rval) 163 { 164 165 if (ms->ms_pos + 1 > _citrus_region_size(&ms->ms_region)) 166 return -1; 167 168 *rval = _citrus_region_peek8(&ms->ms_region, ms->ms_pos); 169 ms->ms_pos += 2; 170 171 return 0; 172 } 173 174 static __inline int 175 _citrus_memory_stream_get16(struct _citrus_memory_stream *ms, uint16_t *rval) 176 { 177 178 if (ms->ms_pos + 2 > _citrus_region_size(&ms->ms_region)) 179 return -1; 180 181 *rval = _citrus_region_peek16(&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_get32(struct _citrus_memory_stream *ms, uint32_t *rval) 189 { 190 191 if (ms->ms_pos + 4 > _citrus_region_size(&ms->ms_region)) 192 return -1; 193 194 *rval = _citrus_region_peek32(&ms->ms_region, ms->ms_pos); 195 ms->ms_pos += 4; 196 197 return 0; 198 } 199 200 static __inline int 201 _citrus_memory_stream_getln_region(struct _citrus_memory_stream *ms, 202 struct _citrus_region *r) 203 { 204 const char *ptr; 205 size_t sz; 206 207 ptr = _citrus_memory_stream_getln(ms, &sz); 208 if (ptr) 209 _citrus_region_init(r, __DECONST(char *, ptr), sz); 210 211 return ptr == NULL; 212 } 213 214 #endif 215