mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-19 05:58:09 +00:00
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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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, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* 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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#include "utf8.h"
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#define UTF8_IS_CONT(ch) (((ch)&0xC0) == 0x80)
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void utf8_substr(const char *buf_start, size_t buf_len, int char_off,
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int char_len, const char **out_start, int *out_len) {
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size_t i = 0;
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for (; i < buf_len; i++) {
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if (char_off == 0) {
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break;
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}
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if (!UTF8_IS_CONT(buf_start[i])) {
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char_off--;
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}
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}
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size_t i_start = i;
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for (; i < buf_len; i++) {
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if (char_len == 0) {
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break;
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}
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if (!UTF8_IS_CONT(buf_start[i])) {
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char_len--;
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}
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}
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for (; i < buf_len; i++) {
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if (!UTF8_IS_CONT(buf_start[i])) {
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break;
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}
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}
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*out_start = buf_start + i_start;
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*out_len = i - i_start;
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}
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