1/*	$NetBSD: literal.c,v 1.5 2019/07/23 13:10:11 christos Exp $	*/
2
3/*-
4 * Copyright (c) 2017 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
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 REGENTS 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 REGENTS 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 "config.h"
33#if !defined(lint) && !defined(SCCSID)
34__RCSID("$NetBSD: literal.c,v 1.5 2019/07/23 13:10:11 christos Exp $");
35#endif /* not lint && not SCCSID */
36
37/*
38 * literal.c: Literal sequences handling.
39 */
40#include <assert.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include "el.h"
45
46libedit_private void
47literal_init(EditLine *el)
48{
49	el_literal_t *l = &el->el_literal;
50
51	memset(l, 0, sizeof(*l));
52}
53
54libedit_private void
55literal_end(EditLine *el)
56{
57	literal_clear(el);
58}
59
60libedit_private void
61literal_clear(EditLine *el)
62{
63	el_literal_t *l = &el->el_literal;
64	size_t i;
65
66	if (l->l_len == 0)
67		return;
68
69	for (i = 0; i < l->l_idx; i++)
70		el_free(l->l_buf[i]);
71	el_free(l->l_buf);
72	l->l_buf = NULL;
73	l->l_len = 0;
74	l->l_idx = 0;
75}
76
77libedit_private wint_t
78literal_add(EditLine *el, const wchar_t *buf, const wchar_t *end, int *wp)
79{
80	el_literal_t *l = &el->el_literal;
81	size_t i, len;
82	ssize_t w, n;
83	char *b;
84
85	w = wcwidth(end[1]);	/* column width of the visible char */
86	*wp = (int)w;
87
88	if (w <= 0)		/* we require something to be printed */
89		return 0;
90
91	len = (size_t)(end - buf);
92	for (w = 0, i = 0; i < len; i++)
93		w += ct_enc_width(buf[i]);
94	w += ct_enc_width(end[1]);
95
96	b = el_malloc((size_t)(w + 1));
97	if (b == NULL)
98		return 0;
99
100	for (n = 0, i = 0; i < len; i++)
101		n += ct_encode_char(b + n, (size_t)(w - n), buf[i]);
102	n += ct_encode_char(b + n, (size_t)(w - n), end[1]);
103	b[n] = '\0';
104
105	/*
106	 * Then save this literal string in the list of such strings,
107	 * and return a "magic character" to put into the terminal buffer.
108	 * When that magic char is 'printed' the saved string (which includes
109	 * the char that belongs in that position) gets sent instead.
110	 */
111	if (l->l_idx == l->l_len) {
112		char **bp;
113
114		l->l_len += 4;
115		bp = el_realloc(l->l_buf, sizeof(*l->l_buf) * l->l_len);
116		if (bp == NULL) {
117			free(b);
118			l->l_len -= 4;
119			return 0;
120		}
121		l->l_buf = bp;
122	}
123	l->l_buf[l->l_idx++] = b;
124	return EL_LITERAL | (wint_t)(l->l_idx - 1);
125}
126
127libedit_private const char *
128literal_get(EditLine *el, wint_t idx)
129{
130	el_literal_t *l = &el->el_literal;
131
132	assert(idx & EL_LITERAL);
133	idx &= ~EL_LITERAL;
134	assert(l->l_idx > (size_t)idx);
135	return l->l_buf[idx];
136}
137