lib/libc/citrus/citrus_memstream.c

   1 /* $FreeBSD: head/lib/libc/iconv/citrus_memstream.c 263986 2014-04-01 10:36:11Z tijl $ */
   2 /*      $NetBSD: citrus_memstream.c,v 1.5 2012/03/13 21:13:31 christos 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/cdefs.h>
  31
  32 #include <assert.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36
  37 #include "citrus_namespace.h"
  38 #include "citrus_region.h"
  39 #include "citrus_memstream.h"
  40 #include "citrus_bcs.h"
  41
  42 const char *
  43 _citrus_memory_stream_getln(struct _citrus_memory_stream * __restrict ms,
  44     size_t * __restrict rlen)
  45 {
  46         const uint8_t *h, *p;
  47         size_t i, 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, size_t * __restrict rlen, int iscasesensitive)
  71 {
  72         const char *p, *q;
  73         size_t keylen, len;
  74
  75         keylen = strlen(key);
  76         for(;;) {
  77                 p = _citrus_memory_stream_getln(ms, &len);
  78                 if (p == NULL)
  79                         return (NULL);
  80
  81                 /* ignore comment */
  82                 q = memchr(p, T_COMM, len);
  83                 if (q) {
  84                         len = q - p;
  85                 }
  86                 /* ignore trailing white space and newline */
  87                 _bcs_trunc_rws_len(p, &len);
  88                 if (len == 0)
  89                         continue; /* ignore null line */
  90
  91                 /* skip white spaces at the head of the line */
  92                 p = _bcs_skip_ws_len(p, &len);
  93                 q = _bcs_skip_nonws_len(p, &len);
  94
  95                 if ((size_t)(q - p) == keylen) {
  96                         if (iscasesensitive) {
  97                                 if (memcmp(key, p, keylen) == 0)
  98                                         break; /* match */
  99                         } else {
 100                                 if (_bcs_strncasecmp(key, p, keylen) == 0)
 101                                         break; /* match */
 102                         }
 103                 }
 104         }
 105
 106         p = _bcs_skip_ws_len(q, &len);
 107         *rlen = len;
 108
 109         return (p);
 110 }
 111
 112 void *
 113 _citrus_memory_stream_chr(struct _citrus_memory_stream *ms,
 114     struct _citrus_region *r, char ch)
 115 {
 116         void *chr, *head;
 117         size_t sz;
 118
 119         if (ms->ms_pos >= _region_size(&ms->ms_region))
 120                 return (NULL);
 121
 122         head = _region_offset(&ms->ms_region, ms->ms_pos);
 123         chr = memchr(head, ch, _memstream_remainder(ms));
 124         if (chr == NULL) {
 125                 _region_init(r, head, _memstream_remainder(ms));
 126                 ms->ms_pos = _region_size(&ms->ms_region);
 127                 return (NULL);
 128         }
 129         sz = (char *)chr - (char *)head;
 130
 131         _region_init(r, head, sz);
 132         ms->ms_pos += sz + 1;
 133
 134         return (chr);
 135 }
 136
 137 void
 138 _citrus_memory_stream_skip_ws(struct _citrus_memory_stream *ms)
 139 {
 140         int ch;
 141
 142         while ((ch = _memstream_peek(ms)) != EOF) {
 143                 if (!_bcs_isspace(ch))
 144                         break;
 145                 _memstream_getc(ms);
 146         }
 147 }