lib/libc/citrus/citrus_memstream.h

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