1/* $FreeBSD$ */
2/*	$NetBSD: citrus_memstream.c,v 1.5 2012/03/13 21:13:31 christos Exp $	*/
3
4/*-
5 * SPDX-License-Identifier: BSD-2-Clause
6 *
7 * Copyright (c)2003 Citrus Project,
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33
34#include <assert.h>
35#include <stdio.h>
36#include <stdlib.h>
37#include <string.h>
38
39#include "citrus_namespace.h"
40#include "citrus_region.h"
41#include "citrus_memstream.h"
42#include "citrus_bcs.h"
43
44const char *
45_citrus_memory_stream_getln(struct _citrus_memory_stream * __restrict ms,
46    size_t * __restrict rlen)
47{
48	const uint8_t *h, *p;
49	size_t i, ret;
50
51	if (ms->ms_pos>=_region_size(&ms->ms_region))
52		return (NULL);
53
54	h = p = (uint8_t *)_region_offset(&ms->ms_region, ms->ms_pos);
55	ret = 0;
56	for (i = _region_size(&ms->ms_region) - ms->ms_pos; i > 0; i--) {
57		ret++;
58		if (_bcs_iseol(*p))
59			break;
60		p++;
61	}
62
63	ms->ms_pos += ret;
64	*rlen = ret;
65	return ((const char *)h);
66}
67
68#define T_COMM	'#'
69
70const char *
71_citrus_memory_stream_matchline(struct _citrus_memory_stream * __restrict ms,
72    const char * __restrict key, size_t * __restrict rlen, int iscasesensitive)
73{
74	const char *p, *q;
75	size_t keylen, len;
76
77	keylen = strlen(key);
78	for(;;) {
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
114void *
115_citrus_memory_stream_chr(struct _citrus_memory_stream *ms,
116    struct _citrus_region *r, char ch)
117{
118	void *chr, *head;
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
139void
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}
150