40 lines
860 B
C++
40 lines
860 B
C++
/*
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Copyright (c) 2014 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#include <cstdlib>
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namespace lean {
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bool is_utf8_next(unsigned char c) { return (c & 0xC0) == 0x80; }
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unsigned get_utf8_size(unsigned char c) {
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if ((c & 0x80) == 0)
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return 1;
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else if ((c & 0xE0) == 0xC0)
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return 2;
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else if ((c & 0xF0) == 0xE0)
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return 3;
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else if ((c & 0xF8) == 0xF0)
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return 4;
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else if ((c & 0xFC) == 0xF8)
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return 5;
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else if ((c & 0xFE) == 0xFC)
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return 6;
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else if (c == 0xFF)
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return 1;
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else
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return 0;
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}
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size_t utf8_strlen(char const * str) {
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size_t r = 0;
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while (*str != 0) {
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unsigned sz = get_utf8_size(*str);
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r++;
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str += sz;
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}
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return r;
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}
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}
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