lib/libc/citrus/citrus_memstream.h

   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