lib/libc/citrus/citrus_memstream.h

   1 /* $FreeBSD: head/lib/libc/iconv/citrus_memstream.h 219019 2011-02-25 00:04:39Z gabor $ */
   2 /* $NetBSD: citrus_memstream.h,v 1.3 2005/05/14 17:55:42 tshiozak 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,
  42                     size_t * __restrict);
  43 const char      *_citrus_memory_stream_matchline(
  44                     struct _citrus_memory_stream * __restrict,
  45                     const char * __restrict, size_t * __restrict, int);
  46 void            *_citrus_memory_stream_chr(struct _citrus_memory_stream *,
  47                     struct _citrus_region *, char);
  48 void            _citrus_memory_stream_skip_ws(struct _citrus_memory_stream *);
  49 __END_DECLS
  50
  51 static __inline int
  52 _citrus_memory_stream_iseof(struct _citrus_memory_stream *ms)
  53 {
  54
  55         return (ms->ms_pos >= _citrus_region_size(&ms->ms_region));
  56 }
  57
  58 static __inline void
  59 _citrus_memory_stream_bind(struct _citrus_memory_stream * __restrict ms,
  60     const struct _citrus_region * __restrict r)
  61 {
  62
  63         ms->ms_region = *r;
  64         ms->ms_pos = 0;
  65 }
  66
  67 static __inline void
  68 _citrus_memory_stream_bind_ptr(struct _citrus_memory_stream * __restrict ms,
  69     void *ptr, size_t sz)
  70 {
  71         struct _citrus_region r;
  72
  73         _citrus_region_init(&r, ptr, sz);
  74         _citrus_memory_stream_bind(ms, &r);
  75 }
  76
  77 static __inline void
  78 _citrus_memory_stream_rewind(struct _citrus_memory_stream *ms)
  79 {
  80
  81         ms->ms_pos = 0;
  82 }
  83
  84 static __inline size_t
  85 _citrus_memory_stream_tell(struct _citrus_memory_stream *ms)
  86 {
  87
  88         return (ms->ms_pos);
  89 }
  90
  91 static __inline size_t
  92 _citrus_memory_stream_remainder(struct _citrus_memory_stream *ms)
  93 {
  94         size_t sz;
  95
  96         sz = _citrus_region_size(&ms->ms_region);
  97         if (ms->ms_pos>sz)
  98                 return (0);
  99         return (sz-ms->ms_pos);
 100 }
 101
 102 static __inline int
 103 _citrus_memory_stream_seek(struct _citrus_memory_stream *ms, size_t pos, int w)
 104 {
 105         size_t sz;
 106
 107         sz = _citrus_region_size(&ms->ms_region);
 108
 109         switch (w) {
 110         case SEEK_SET:
 111                 if (pos >= sz)
 112                         return (-1);
 113                 ms->ms_pos = pos;
 114                 break;
 115         case SEEK_CUR:
 116                 pos += (ssize_t)ms->ms_pos;
 117                 if (pos >= sz)
 118                         return (-1);
 119                 ms->ms_pos = pos;
 120                 break;
 121         case SEEK_END:
 122                 if (sz < pos)
 123                         return (-1);
 124                 ms->ms_pos = sz - pos;
 125                 break;
 126         }
 127         return (0);
 128 }
 129
 130 static __inline int
 131 _citrus_memory_stream_getc(struct _citrus_memory_stream *ms)
 132 {
 133
 134         if (_citrus_memory_stream_iseof(ms))
 135                 return (EOF);
 136         return (_citrus_region_peek8(&ms->ms_region, ms->ms_pos++));
 137 }
 138
 139 static __inline void
 140 _citrus_memory_stream_ungetc(struct _citrus_memory_stream *ms, int ch)
 141 {
 142
 143         if (ch != EOF && ms->ms_pos > 0)
 144                 ms->ms_pos--;
 145 }
 146
 147 static __inline int
 148 _citrus_memory_stream_peek(struct _citrus_memory_stream *ms)
 149 {
 150
 151         if (_citrus_memory_stream_iseof(ms))
 152                 return (EOF);
 153         return (_citrus_region_peek8(&ms->ms_region, ms->ms_pos));
 154 }
 155
 156 static __inline void *
 157 _citrus_memory_stream_getregion(struct _citrus_memory_stream *ms,
 158     struct _citrus_region *r, size_t sz)
 159 {
 160         void *ret;
 161
 162         if (ms->ms_pos + sz > _citrus_region_size(&ms->ms_region))
 163                 return (NULL);
 164
 165         ret = _citrus_region_offset(&ms->ms_region, ms->ms_pos);
 166         ms->ms_pos += sz;
 167         if (r)
 168                 _citrus_region_init(r, ret, sz);
 169
 170         return (ret);
 171 }
 172
 173 static __inline int
 174 _citrus_memory_stream_get8(struct _citrus_memory_stream *ms, uint8_t *rval)
 175 {
 176
 177         if (ms->ms_pos + 1 > _citrus_region_size(&ms->ms_region))
 178                 return (-1);
 179
 180         *rval = _citrus_region_peek8(&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_get16(struct _citrus_memory_stream *ms, uint16_t *rval)
 188 {
 189
 190         if (ms->ms_pos + 2 > _citrus_region_size(&ms->ms_region))
 191                 return (-1);
 192
 193         *rval = _citrus_region_peek16(&ms->ms_region, ms->ms_pos);
 194         ms->ms_pos += 2;
 195
 196         return (0);
 197 }
 198
 199 static __inline int
 200 _citrus_memory_stream_get32(struct _citrus_memory_stream *ms, uint32_t *rval)
 201 {
 202
 203         if (ms->ms_pos + 4 > _citrus_region_size(&ms->ms_region))
 204                 return (-1);
 205
 206         *rval = _citrus_region_peek32(&ms->ms_region, ms->ms_pos);
 207         ms->ms_pos += 4;
 208
 209         return (0);
 210 }
 211
 212 static __inline int
 213 _citrus_memory_stream_getln_region(struct _citrus_memory_stream *ms,
 214     struct _citrus_region *r)
 215 {
 216         const char *ptr;
 217         size_t sz;
 218
 219         ptr = _citrus_memory_stream_getln(ms, &sz);
 220         if (ptr)
 221                 _citrus_region_init(r, __DECONST(void *, ptr), sz);
 222
 223         return (ptr == NULL);
 224 }
 225
 226 #endif