lib/libc/citrus/citrus_memstream.c

   1 /*      $NetBSD: citrus_memstream.c,v 1.5 2012/03/13 21:13:31 christos 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 #include <sys/cdefs.h>
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 __RCSID("$NetBSD: citrus_memstream.c,v 1.5 2012/03/13 21:13:31 christos Exp $");
  32 #endif /* LIBC_SCCS and not lint */
  33
  34 #include "namespace.h"
  35 #include <assert.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39
  40 #include "citrus_namespace.h"
  41 #include "citrus_region.h"
  42 #include "citrus_memstream.h"
  43 #include "citrus_bcs.h"
  44
  45 const char *
  46 _citrus_memory_stream_getln(struct _citrus_memory_stream * __restrict ms,
  47                             size_t * __restrict rlen)
  48 {
  49         size_t i;
  50         const uint8_t *h, *p;
  51         size_t ret;
  52
  53         if (ms->ms_pos>=_region_size(&ms->ms_region))
  54                 return (NULL);
  55
  56         h = p = (uint8_t *)_region_offset(&ms->ms_region, ms->ms_pos);
  57         ret = 0;
  58         for (i = _region_size(&ms->ms_region) - ms->ms_pos; i > 0; i--) {
  59                 ret++;
  60                 if (_bcs_iseol(*p))
  61                         break;
  62                 p++;
  63         }
  64
  65         ms->ms_pos += ret;
  66         *rlen = ret;
  67         return ((const char *)h);
  68 }
  69
  70 #define T_COMM  '#'
  71
  72 const char *
  73 _citrus_memory_stream_matchline(struct _citrus_memory_stream * __restrict ms,
  74                                 const char * __restrict key,
  75                                 size_t * __restrict rlen,
  76                                 int iscasesensitive)
  77 {
  78         const char *p, *q;
  79         size_t len, keylen;
  80
  81         keylen = strlen(key);
  82         while (/*CONSTCOND*/ 1) {
  83                 p = _citrus_memory_stream_getln(ms, &len);
  84                 if (p == NULL)
  85                         return (NULL);
  86
  87                 /* ignore comment */
  88                 q = memchr(p, T_COMM, len);
  89                 if (q) {
  90                         len = q-p;
  91                 }
  92                 /* ignore trailing white space and newline */
  93                 _bcs_trunc_rws_len(p, &len);
  94                 if (len == 0)
  95                         continue; /* ignore null line */
  96
  97                 /* skip white spaces at the head of the line */
  98                 p = _bcs_skip_ws_len(p, &len);
  99                 q = _bcs_skip_nonws_len(p, &len);
 100
 101                 if ((size_t)(q-p) == keylen) {
 102                         if (iscasesensitive) {
 103                                 if (memcmp(key, p, keylen) == 0)
 104                                         break; /* match */
 105                         } else {
 106                                 if (_bcs_strncasecmp(key, p, keylen) == 0)
 107                                         break; /* match */
 108                         }
 109                 }
 110         }
 111
 112         p = _bcs_skip_ws_len(q, &len);
 113         *rlen = len;
 114
 115         return (p);
 116 }
 117
 118 void *
 119 _citrus_memory_stream_chr(struct _citrus_memory_stream *ms,
 120                           struct _citrus_region *r, char ch)
 121 {
 122         void *head, *chr;
 123         size_t sz;
 124
 125         if (ms->ms_pos >= _region_size(&ms->ms_region))
 126                 return NULL;
 127
 128         head = _region_offset(&ms->ms_region, ms->ms_pos);
 129         chr = memchr(head, ch, _memstream_remainder(ms));
 130         if (chr == NULL) {
 131                 _region_init(r, head, _memstream_remainder(ms));
 132                 ms->ms_pos = _region_size(&ms->ms_region);
 133                 return NULL;
 134         }
 135         sz = (char *)chr - (char *)head;
 136
 137         _region_init(r, head, sz);
 138         ms->ms_pos += sz+1;
 139
 140         return chr;
 141 }
 142
 143 void
 144 _citrus_memory_stream_skip_ws(struct _citrus_memory_stream *ms)
 145 {
 146         int ch;
 147
 148         while ((ch = _memstream_peek(ms)) != EOF) {
 149                 if (!_bcs_isspace(ch))
 150                         break;
 151                 _memstream_getc(ms);
 152         }
 153 }