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refactor(core/embed): move&rename display_utf8_substr()

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cepetr 2024-01-17 15:29:49 +01:00 committed by cepetr
parent 74c1129445
commit 3031ec5d87
3 changed files with 85 additions and 4 deletions
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4
core/embed/lib/display.h
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@ -69,8 +69,4 @@ void display_qrcode(int x, int y, const char *data, uint8_t scale);
void display_offset(int set_xy[2], int *get_x, int *get_y); void display_offset(int set_xy[2], int *get_x, int *get_y);
void display_fade(int start, int end, int delay); void display_fade(int start, int end, int delay);
// helper for locating a substring in buffer with utf-8 string
void display_utf8_substr(const char *buf_start, size_t buf_len, int char_off,
int char_len, const char **out_start, int *out_len);
#endif #endif

55
core/embed/lib/utf8.c Normal file
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@ -0,0 +1,55 @@
/*
* This file is part of the Trezor project, https://trezor.io/
*
* Copyright (c) SatoshiLabs
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "utf8.h"
#define UTF8_IS_CONT(ch) (((ch)&0xC0) == 0x80)
void utf8_substr(const char *buf_start, size_t buf_len, int char_off,
int char_len, const char **out_start, int *out_len) {
size_t i = 0;
for (; i < buf_len; i++) {
if (char_off == 0) {
break;
}
if (!UTF8_IS_CONT(buf_start[i])) {
char_off--;
}
}
size_t i_start = i;
for (; i < buf_len; i++) {
if (char_len == 0) {
break;
}
if (!UTF8_IS_CONT(buf_start[i])) {
char_len--;
}
}
for (; i < buf_len; i++) {
if (!UTF8_IS_CONT(buf_start[i])) {
break;
}
}
*out_start = buf_start + i_start;
*out_len = i - i_start;
}

30
core/embed/lib/utf8.h Normal file
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@ -0,0 +1,30 @@
/*
* This file is part of the Trezor project, https://trezor.io/
*
* Copyright (c) SatoshiLabs
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef LIB_UTF8_H
#define LIB_UTF8_H
#include <stddef.h>
#include <stdint.h>
// helper for locating a substring in buffer with utf-8 string
void utf8_substr(const char *buf_start, size_t buf_len, int char_off,
int char_len, const char **out_start, int *out_len);
#endif // LIB_UTF8_H