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      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 }
    154