657 lines
15 KiB
C
657 lines
15 KiB
C
/**************************************************************************
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* chars.c -- This file is part of GNU nano. *
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* *
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* Copyright (C) 2001-2011, 2013-2021 Free Software Foundation, Inc. *
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* Copyright (C) 2016-2021 Benno Schulenberg *
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* *
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* GNU nano is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published *
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* by the Free Software Foundation, either version 3 of the License, *
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* or (at your option) any later version. *
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* *
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* GNU nano is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty *
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
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* See the GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see http://www.gnu.org/licenses/. *
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* *
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**************************************************************************/
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#include "prototypes.h"
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#include <ctype.h>
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#include <string.h>
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#ifdef ENABLE_UTF8
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#include <wchar.h>
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#include <wctype.h>
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static bool use_utf8 = FALSE;
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/* Whether we've enabled UTF-8 support. */
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/* Enable UTF-8 support. */
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void utf8_init(void)
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{
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use_utf8 = TRUE;
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}
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/* Is UTF-8 support enabled? */
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bool using_utf8(void)
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{
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return use_utf8;
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}
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#endif /* ENABLE_UTF8 */
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#ifdef ENABLE_SPELLER
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/* Return TRUE when the given character is some kind of letter. */
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bool is_alpha_char(const char *c)
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{
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#ifdef ENABLE_UTF8
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wchar_t wc;
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if (mbtowide(&wc, c) < 0)
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return FALSE;
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return iswalpha(wc);
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#else
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return isalpha((unsigned char)*c);
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#endif
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}
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#endif /* ENABLE_SPELLER */
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/* Return TRUE when the given character is some kind of letter or a digit. */
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bool is_alnum_char(const char *c)
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{
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#ifdef ENABLE_UTF8
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wchar_t wc;
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if (mbtowide(&wc, c) < 0)
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return FALSE;
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return iswalnum(wc);
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#else
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return isalnum((unsigned char)*c);
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#endif
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}
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/* Return TRUE when the given character is space or tab or other whitespace. */
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bool is_blank_char(const char *c)
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{
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#ifdef ENABLE_UTF8
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wchar_t wc;
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if ((signed char)*c >= 0)
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return (*c == ' ' || *c == '\t');
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if (mbtowide(&wc, c) < 0)
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return FALSE;
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return iswblank(wc);
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#else
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return isblank((unsigned char)*c);
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#endif
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}
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/* Return TRUE when the given character is a control character. */
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bool is_cntrl_char(const char *c)
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{
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#ifdef ENABLE_UTF8
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if (use_utf8) {
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return ((c[0] & 0xE0) == 0 || c[0] == DEL_CODE ||
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((signed char)c[0] == -62 && (signed char)c[1] < -96));
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} else
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#endif
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return ((*c & 0x60) == 0 || *c == DEL_CODE);
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}
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/* Return TRUE when the given character is a punctuation character. */
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bool is_punct_char(const char *c)
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{
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#ifdef ENABLE_UTF8
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wchar_t wc;
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if (mbtowide(&wc, c) < 0)
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return FALSE;
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return iswpunct(wc);
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#else
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return ispunct((unsigned char)*c);
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#endif
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}
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/* Return TRUE when the given character is word-forming (it is alphanumeric or
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* specified in 'wordchars', or it is punctuation when allow_punct is TRUE). */
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bool is_word_char(const char *c, bool allow_punct)
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{
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if (*c == '\0')
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return FALSE;
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if (is_alnum_char(c))
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return TRUE;
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if (allow_punct && is_punct_char(c))
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return TRUE;
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if (word_chars != NULL && *word_chars != '\0') {
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char symbol[MAXCHARLEN + 1];
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int symlen = collect_char(c, symbol);
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symbol[symlen] = '\0';
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return (strstr(word_chars, symbol) != NULL);
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} else
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return FALSE;
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}
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/* Return the visible representation of control character c. */
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char control_rep(const signed char c)
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{
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if (c == DEL_CODE)
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return '?';
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else if (c == -97)
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return '=';
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else if (c < 0)
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return c + 224;
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else
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return c + 64;
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}
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/* Return the visible representation of multibyte control character c. */
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char control_mbrep(const char *c, bool isdata)
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{
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/* An embedded newline is an encoded NUL if it is data. */
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if (*c == '\n' && (isdata || as_an_at))
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return '@';
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#ifdef ENABLE_UTF8
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if (use_utf8) {
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if ((unsigned char)c[0] < 128)
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return control_rep(c[0]);
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else
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return control_rep(c[1]);
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} else
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#endif
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return control_rep(*c);
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}
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#ifdef ENABLE_UTF8
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/* Convert the given multibyte sequence c to wide character wc, and return
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* the number of bytes in the sequence, or -1 for an invalid sequence. */
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int mbtowide(wchar_t *wc, const char *c)
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{
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if ((signed char)*c < 0 && use_utf8) {
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unsigned char v1 = (unsigned char)c[0];
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unsigned char v2 = (unsigned char)c[1] ^ 0x80;
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if (v2 > 0x3F || v1 < 0xC2)
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return -1;
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if (v1 < 0xE0) {
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*wc = (((unsigned int)(v1 & 0x1F) << 6) | (unsigned int)v2);
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return 2;
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}
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unsigned char v3 = (unsigned char)c[2] ^ 0x80;
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if (v3 > 0x3F)
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return -1;
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if (v1 < 0xF0) {
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if ((v1 > 0xE0 || v2 >= 0x20) && (v1 != 0xED || v2 < 0x20)) {
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*wc = (((unsigned int)(v1 & 0x0F) << 12) |
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((unsigned int)v2 << 6) | (unsigned int)v3);
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return 3;
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} else
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return -1;
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}
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unsigned char v4 = (unsigned char)c[3] ^ 0x80;
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if (v4 > 0x3F || v1 > 0xF4)
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return -1;
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if ((v1 > 0xF0 || v2 >= 0x10) && (v1 != 0xF4 || v2 < 0x10)) {
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*wc = (((unsigned int)(v1 & 0x07) << 18) | ((unsigned int)v2 << 12) |
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((unsigned int)v3 << 6) | (unsigned int)v4);
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return 4;
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} else
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return -1;
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}
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*wc = (unsigned int)*c;
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return 1;
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}
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/* Return TRUE when the given character occupies two cells. */
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bool is_doublewidth(const char *ch)
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{
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wchar_t wc;
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/* Only from U+1100 can code points have double width. */
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if ((unsigned char)*ch < 0xE1 || !use_utf8)
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return FALSE;
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if (mbtowide(&wc, ch) < 0)
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return FALSE;
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return (wcwidth(wc) == 2);
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}
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/* Return TRUE when the given character occupies zero cells. */
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bool is_zerowidth(const char *ch)
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{
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wchar_t wc;
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/* Only from U+0300 can code points have zero width. */
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if ((unsigned char)*ch < 0xCC || !use_utf8)
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return FALSE;
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if (mbtowide(&wc, ch) < 0)
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return FALSE;
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#if defined(__OpenBSD__)
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/* Work around an OpenBSD bug -- see https://sv.gnu.org/bugs/?60393. */
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if (wc >= 0xF0000)
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return FALSE;
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#endif
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return (wcwidth(wc) == 0);
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}
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#endif /* ENABLE_UTF8 */
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/* Return the number of bytes in the character that starts at *pointer. */
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int char_length(const char *pointer)
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{
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#ifdef ENABLE_UTF8
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if ((unsigned char)*pointer > 0xC1 && use_utf8) {
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unsigned char c1 = (unsigned char)pointer[0];
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unsigned char c2 = (unsigned char)pointer[1];
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if ((c2 ^ 0x80) > 0x3F)
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return 1;
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if (c1 < 0xE0)
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return 2;
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if (((unsigned char)pointer[2] ^ 0x80) > 0x3F)
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return 1;
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if (c1 < 0xF0) {
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if ((c1 > 0xE0 || c2 >= 0xA0) && (c1 != 0xED || c2 < 0xA0))
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return 3;
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else
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return 1;
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}
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if (((unsigned char)pointer[3] ^ 0x80) > 0x3F)
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return 1;
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if (c1 > 0xF4)
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return 1;
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if ((c1 > 0xF0 || c2 >= 0x90) && (c1 != 0xF4 || c2 < 0x90))
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return 4;
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}
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#endif
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return 1;
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}
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/* Return the number of (multibyte) characters in the given string. */
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size_t mbstrlen(const char *pointer)
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{
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size_t count = 0;
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while (*pointer != '\0') {
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pointer += char_length(pointer);
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count++;
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}
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return count;
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}
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/* Return the length (in bytes) of the character at the start of the
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* given string, and return a copy of this character in *thechar. */
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int collect_char(const char *string, char *thechar)
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{
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int charlen = char_length(string);
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for (int i = 0; i < charlen; i++)
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thechar[i] = string[i];
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return charlen;
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}
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/* Return the length (in bytes) of the character at the start of
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* the given string, and add this character's width to *column. */
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int advance_over(const char *string, size_t *column)
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{
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#ifdef ENABLE_UTF8
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if ((signed char)*string < 0 && use_utf8) {
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/* A UTF-8 upper control code has two bytes and takes two columns. */
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if (((unsigned char)string[0] == 0xC2 && (signed char)string[1] < -96)) {
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*column += 2;
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return 2;
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} else {
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wchar_t wc;
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int charlen = mbtowide(&wc, string);
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if (charlen < 0) {
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*column += 1;
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return 1;
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}
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int width = wcwidth(wc);
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#if defined(__OpenBSD__)
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*column += (width < 0 || wc >= 0xF0000) ? 1 : width;
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#else
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*column += (width < 0) ? 1 : width;
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#endif
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return charlen;
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}
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}
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#endif
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if ((unsigned char)*string < 0x20) {
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if (*string == '\t')
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*column += tabsize - *column % tabsize;
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else
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*column += 2;
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} else if (0x7E < (unsigned char)*string && (unsigned char)*string < 0xA0)
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*column += 2;
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else
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*column += 1;
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return 1;
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}
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/* Return the index in buf of the beginning of the multibyte character
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* before the one at pos. */
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size_t step_left(const char *buf, size_t pos)
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{
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#ifdef ENABLE_UTF8
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if (use_utf8) {
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size_t before, charlen = 0;
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if (pos < 4)
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before = 0;
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else {
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const char *ptr = buf + pos;
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/* Probe for a valid starter byte in the preceding four bytes. */
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if ((signed char)*(--ptr) > -65)
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before = pos - 1;
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else if ((signed char)*(--ptr) > -65)
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before = pos - 2;
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else if ((signed char)*(--ptr) > -65)
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before = pos - 3;
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else if ((signed char)*(--ptr) > -65)
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before = pos - 4;
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else
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before = pos - 1;
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}
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/* Move forward again until we reach the original character,
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* so we know the length of its preceding character. */
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while (before < pos) {
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charlen = char_length(buf + before);
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before += charlen;
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}
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return before - charlen;
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} else
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#endif
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return (pos == 0 ? 0 : pos - 1);
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}
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/* Return the index in buf of the beginning of the multibyte character
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* after the one at pos. */
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size_t step_right(const char *buf, size_t pos)
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{
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return pos + char_length(buf + pos);
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}
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/* This function is equivalent to strcasecmp() for multibyte strings. */
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int mbstrcasecmp(const char *s1, const char *s2)
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{
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return mbstrncasecmp(s1, s2, HIGHEST_POSITIVE);
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}
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/* This function is equivalent to strncasecmp() for multibyte strings. */
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int mbstrncasecmp(const char *s1, const char *s2, size_t n)
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{
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#ifdef ENABLE_UTF8
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if (use_utf8) {
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wchar_t wc1, wc2;
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while (*s1 != '\0' && *s2 != '\0' && n > 0) {
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if ((signed char)*s1 >= 0 && (signed char)*s2 >= 0) {
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if ('A' <= (*s1 & 0x5F) && (*s1 & 0x5F) <= 'Z') {
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if ('A' <= (*s2 & 0x5F) && (*s2 & 0x5F) <= 'Z') {
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if ((*s1 & 0x5F) != (*s2 & 0x5F))
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return ((*s1 & 0x5F) - (*s2 & 0x5F));
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} else
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return ((*s1 | 0x20) - *s2);
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} else if ('A' <= (*s2 & 0x5F) && (*s2 & 0x5F) <= 'Z')
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return (*s1 - (*s2 | 0x20));
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else if (*s1 != *s2)
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return (*s1 - *s2);
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s1++; s2++; n--;
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continue;
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}
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bool bad1 = (mbtowide(&wc1, s1) < 0);
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bool bad2 = (mbtowide(&wc2, s2) < 0);
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if (bad1 || bad2) {
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if (*s1 != *s2)
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return (unsigned char)*s1 - (unsigned char)*s2;
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if (bad1 != bad2)
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return (bad1 ? 1 : -1);
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} else {
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int difference = towlower(wc1) - towlower(wc2);
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if (difference != 0)
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return difference;
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}
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s1 += char_length(s1);
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s2 += char_length(s2);
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n--;
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}
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return (n > 0) ? ((unsigned char)*s1 - (unsigned char)*s2) : 0;
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} else
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#endif
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return strncasecmp(s1, s2, n);
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}
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/* This function is equivalent to strcasestr() for multibyte strings. */
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char *mbstrcasestr(const char *haystack, const char *needle)
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{
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#ifdef ENABLE_UTF8
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if (use_utf8) {
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size_t needle_len = mbstrlen(needle);
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while (*haystack != '\0') {
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if (mbstrncasecmp(haystack, needle, needle_len) == 0)
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return (char *)haystack;
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haystack += char_length(haystack);
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}
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return NULL;
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} else
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#endif
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return (char *)strcasestr(haystack, needle);
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}
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/* This function is equivalent to strstr(), except in that it scans the
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* string in reverse, starting at pointer. */
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char *revstrstr(const char *haystack, const char *needle,
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const char *pointer)
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{
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size_t needle_len = strlen(needle);
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size_t tail_len = strlen(pointer);
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if (tail_len < needle_len)
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pointer -= (needle_len - tail_len);
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while (pointer >= haystack) {
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if (strncmp(pointer, needle, needle_len) == 0)
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return (char *)pointer;
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pointer--;
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}
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return NULL;
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}
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/* This function is equivalent to strcasestr(), except in that it scans
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* the string in reverse, starting at pointer. */
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char *revstrcasestr(const char *haystack, const char *needle,
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const char *pointer)
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{
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size_t needle_len = strlen(needle);
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size_t tail_len = strlen(pointer);
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if (tail_len < needle_len)
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pointer -= (needle_len - tail_len);
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while (pointer >= haystack) {
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if (strncasecmp(pointer, needle, needle_len) == 0)
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return (char *)pointer;
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pointer--;
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}
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return NULL;
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}
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/* This function is equivalent to strcasestr() for multibyte strings,
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* except in that it scans the string in reverse, starting at pointer. */
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char *mbrevstrcasestr(const char *haystack, const char *needle,
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const char *pointer)
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{
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#ifdef ENABLE_UTF8
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if (use_utf8) {
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size_t needle_len = mbstrlen(needle);
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size_t tail_len = mbstrlen(pointer);
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if (tail_len < needle_len)
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pointer -= (needle_len - tail_len);
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if (pointer < haystack)
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return NULL;
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while (TRUE) {
|
|
if (mbstrncasecmp(pointer, needle, needle_len) == 0)
|
|
return (char *)pointer;
|
|
|
|
if (pointer == haystack)
|
|
return NULL;
|
|
|
|
pointer = haystack + step_left(haystack, pointer - haystack);
|
|
}
|
|
} else
|
|
#endif
|
|
return revstrcasestr(haystack, needle, pointer);
|
|
}
|
|
|
|
#if !defined(NANO_TINY) || defined(ENABLE_JUSTIFY)
|
|
/* This function is equivalent to strchr() for multibyte strings. */
|
|
char *mbstrchr(const char *string, const char *chr)
|
|
{
|
|
#ifdef ENABLE_UTF8
|
|
if (use_utf8) {
|
|
bool bad_s = FALSE, bad_c = FALSE;
|
|
wchar_t ws, wc;
|
|
|
|
if (mbtowide(&wc, chr) < 0) {
|
|
wc = (unsigned char)*chr;
|
|
bad_c = TRUE;
|
|
}
|
|
|
|
while (*string != '\0') {
|
|
int symlen = mbtowide(&ws, string);
|
|
|
|
if (symlen < 0) {
|
|
ws = (unsigned char)*string;
|
|
bad_s = TRUE;
|
|
}
|
|
|
|
if (ws == wc && bad_s == bad_c)
|
|
break;
|
|
|
|
string += symlen;
|
|
}
|
|
|
|
if (*string == '\0')
|
|
return NULL;
|
|
|
|
return (char *)string;
|
|
} else
|
|
#endif
|
|
return strchr(string, *chr);
|
|
}
|
|
#endif /* !NANO_TINY || ENABLE_JUSTIFY */
|
|
|
|
#ifndef NANO_TINY
|
|
/* Locate, in the given string, the first occurrence of any of
|
|
* the characters in accept, searching forward. */
|
|
char *mbstrpbrk(const char *string, const char *accept)
|
|
{
|
|
while (*string != '\0') {
|
|
if (mbstrchr(accept, string) != NULL)
|
|
return (char *)string;
|
|
|
|
string += char_length(string);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Locate, in the string that starts at head, the first occurrence of any of
|
|
* the characters in accept, starting from pointer and searching backwards. */
|
|
char *mbrevstrpbrk(const char *head, const char *accept, const char *pointer)
|
|
{
|
|
if (*pointer == '\0') {
|
|
if (pointer == head)
|
|
return NULL;
|
|
pointer = head + step_left(head, pointer - head);
|
|
}
|
|
|
|
while (TRUE) {
|
|
if (mbstrchr(accept, pointer) != NULL)
|
|
return (char *)pointer;
|
|
|
|
/* If we've reached the head of the string, we found nothing. */
|
|
if (pointer == head)
|
|
return NULL;
|
|
|
|
pointer = head + step_left(head, pointer - head);
|
|
}
|
|
}
|
|
#endif /* !NANO_TINY */
|
|
|
|
#if defined(ENABLE_NANORC) && (!defined(NANO_TINY) || defined(ENABLE_JUSTIFY))
|
|
/* Return TRUE if the given string contains at least one blank character. */
|
|
bool has_blank_char(const char *string)
|
|
{
|
|
while (*string != '\0' && !is_blank_char(string))
|
|
string += char_length(string);
|
|
|
|
return *string;
|
|
}
|
|
#endif
|
|
|
|
/* Return TRUE when the given string is empty or consists of only blanks. */
|
|
bool white_string(const char *string)
|
|
{
|
|
while (*string != '\0' && (is_blank_char(string) || *string == '\r'))
|
|
string += char_length(string);
|
|
|
|
return !*string;
|
|
}
|