65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
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/*
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This file is part of actube.
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actube 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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libcapwap 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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You should have received a copy of the GNU General Public License
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along with Foobar. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file
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* @brief Implementation for format_is_utf8
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*/
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#include "format.h"
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/**
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* Check if a string is in UTF8 format
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* @param str String to check
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* @param len Length of the string
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* @return 0 if the string is not in UTF8 format, otherwise it is UTF8.
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*/
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int format_is_utf8(unsigned char *str, size_t len)
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{
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size_t i = 0;
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size_t bytes = 0;
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while (i < len) {
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if (str[i] < 0x20) {
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return 0;
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}
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if (str[i] <= 0x7F)
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bytes = 0;
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else if (str[i] >= 0xC0 /*11000000 */ && str[i] <= 0xDF /*11011111 */ )
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bytes = 1;
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else if (str[i] >= 0xE0 /*11100000 */ && str[i] <= 0xEF /*11101111 */ )
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bytes = 2;
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else if (str[i] >= 0xF0 /*11110000 */
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&& str[i] <= 0xF4 /* Cause of RFC 3629 */ )
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bytes = 3;
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else {
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return 0;
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}
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i += 1;
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while (i < len && bytes > 0 && str[i] >= 0x80 && str[i] <= 0xBF) {
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i += 1;
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bytes -= 1;
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}
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if (bytes != 0) {
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return 0;
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}
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}
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return 1;
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}
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