73 lines
3.1 KiB
C
73 lines
3.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program 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 by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ 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, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/safemacros.h"
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#include "libc/conv/conv.h"
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#include "libc/limits.h"
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#include "libc/str/internal.h"
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#include "libc/str/str.h"
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#include "libc/str/tpdecode.h"
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#include "libc/unicode/unicode.h"
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#define kOneTrueTabWidth 8
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/**
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* Returns monospace display width in UTF-8 string.
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*/
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int(strwidth)(const char *s) {
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return strnwidth(s, SIZE_MAX);
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}
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int(strnwidth)(const char *s, size_t n) {
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/* TODO(jart): Fix this function. */
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size_t l;
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wint_t wc;
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const unsigned char *p, *pe;
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l = 0;
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if (n) {
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p = (const unsigned char *)s;
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pe = (const unsigned char *)(n == SIZE_MAX ? INTPTR_MAX : (intptr_t)s + n);
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for (;;) {
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while (p < pe && iscont(*p)) p++;
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if (p == pe || !*p) break;
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if (*p == L'\t') {
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if (l & (kOneTrueTabWidth - 1)) {
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l += kOneTrueTabWidth - (l & (kOneTrueTabWidth - 1));
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} else {
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l += kOneTrueTabWidth;
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}
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++p;
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} else if (*p == L'\e') {
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while (++p < pe && *p) {
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if (*p == '[' || *p == ';' || isdigit(*p)) {
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continue;
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} else {
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++p;
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break;
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}
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}
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} else {
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p += abs(tpdecode((const char *)p, &wc));
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l += max(0, wcwidth(wc));
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}
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}
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}
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return l;
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}
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