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 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) /* 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 * 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