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
46 libedit_private void
literal_init(EditLine * el)47 literal_init(EditLine *el)
48 {
49 el_literal_t *l = &el->el_literal;
50
51 memset(l, 0, sizeof(*l));
52 }
53
54 libedit_private void
literal_end(EditLine * el)55 literal_end(EditLine *el)
56 {
57 literal_clear(el);
58 }
59
60 libedit_private void
literal_clear(EditLine * el)61 literal_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
77 libedit_private wint_t
literal_add(EditLine * el,const wchar_t * buf,const wchar_t * end,int * wp)78 literal_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
127 libedit_private const char *
literal_get(EditLine * el,wint_t idx)128 literal_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