lib/libc/citrus/citrus_memstream.c

   1 /* $NetBSD: citrus_memstream.c,v 1.3 2008/02/09 14:56:20 junyoung Exp $ */
   2 /* $DragonFly: src/lib/libc/citrus/citrus_memstream.c,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 #include <sys/types.h>
  31 #include <assert.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35
  36 #include "citrus_namespace.h"
  37 #include "citrus_region.h"
  38 #include "citrus_memstream.h"
  39 #include "citrus_bcs.h"
  40
  41 const char *
  42 _citrus_memory_stream_getln(struct _citrus_memory_stream * __restrict ms,
  43                             size_t * __restrict rlen)
  44 {
  45         int i;
  46         const uint8_t *h, *p;
  47         size_t ret;
  48
  49         if (ms->ms_pos>=_region_size(&ms->ms_region))
  50                 return (NULL);
  51
  52         h = p = (uint8_t *)_region_offset(&ms->ms_region, ms->ms_pos);
  53         ret = 0;
  54         for (i = _region_size(&ms->ms_region) - ms->ms_pos; i > 0; i--) {
  55                 ret++;
  56                 if (_bcs_iseol(*p))
  57                         break;
  58                 p++;
  59         }
  60
  61         ms->ms_pos += ret;
  62         *rlen = ret;
  63         return ((const char *)h);
  64 }
  65
  66 #define T_COMM  '#'
  67
  68 const char *
  69 _citrus_memory_stream_matchline(struct _citrus_memory_stream * __restrict ms,
  70                                 const char * __restrict key,
  71                                 size_t * __restrict rlen,
  72                                 int iscasesensitive)
  73 {
  74         const char *p, *q;
  75         size_t len, keylen;
  76
  77         keylen = strlen(key);
  78         while (/*CONSTCOND*/ 1) {
  79                 p = _citrus_memory_stream_getln(ms, &len);
  80                 if (p == NULL)
  81                         return (NULL);
  82
  83                 /* ignore comment */
  84                 q = memchr(p, T_COMM, len);
  85                 if (q) {
  86                         len = q-p;
  87                 }
  88                 /* ignore trailing white space and newline */
  89                 _bcs_trunc_rws_len(p, &len);
  90                 if (len == 0)
  91                         continue; /* ignore null line */
  92
  93                 /* skip white spaces at the head of the line */
  94                 p = _bcs_skip_ws_len(p, &len);
  95                 q = _bcs_skip_nonws_len(p, &len);
  96
  97                 if ((size_t)(q-p) == keylen) {
  98                         if (iscasesensitive) {
  99                                 if (memcmp(key, p, keylen) == 0)
 100                                         break; /* match */
 101                         } else {
 102                                 if (_bcs_strncasecmp(key, p, keylen) == 0)
 103                                         break; /* match */
 104                         }
 105                 }
 106         }
 107
 108         p = _bcs_skip_ws_len(q, &len);
 109         *rlen = len;
 110
 111         return (p);
 112 }
 113
 114 void *
 115 _citrus_memory_stream_chr(struct _citrus_memory_stream *ms,
 116                           struct _citrus_region *r, char ch)
 117 {
 118         void *head, *chr;
 119         size_t sz;
 120
 121         if (ms->ms_pos >= _region_size(&ms->ms_region))
 122                 return NULL;
 123
 124         head = _region_offset(&ms->ms_region, ms->ms_pos);
 125         chr = memchr(head, ch, _memstream_remainder(ms));
 126         if (chr == NULL) {
 127                 _region_init(r, head, _memstream_remainder(ms));
 128                 ms->ms_pos = _region_size(&ms->ms_region);
 129                 return NULL;
 130         }
 131         sz = (char *)chr - (char *)head;
 132
 133         _region_init(r, head, sz);
 134         ms->ms_pos += sz+1;
 135
 136         return chr;
 137 }
 138
 139 void
 140 _citrus_memory_stream_skip_ws(struct _citrus_memory_stream *ms)
 141 {
 142         int ch;
 143
 144         while ((ch = _memstream_peek(ms)) != EOF) {
 145                 if (!_bcs_isspace(ch))
 146                         break;
 147                 _memstream_getc(ms);
 148         }
 149 }