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      1 /*	$NetBSD: literal.c,v 1.6 2024/12/05 22:21:53 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 1.6 2024/12/05 22:21:53 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
     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
     55 literal_end(EditLine *el)
     56 {
     57 	literal_clear(el);
     58 }
     59 
     60 libedit_private void
     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
     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)		/* non-printable characters are negative */
     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 *
    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