24 lines
549 B
C
24 lines
549 B
C
#include "runtime/utf16.h"
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int utf16_iterate(const uint8_t *string, size_t length, int32_t *code_point) {
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uint16_t *units = (uint16_t *)string;
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uint16_t unit = units[0];
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if (unit < 0xd800 || unit >= 0xe000) {
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*code_point = unit;
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return 2;
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}
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if (unit < 0xdc00) {
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if (length >= 4) {
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uint16_t next_unit = units[1];
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if (next_unit >= 0xdc00 && next_unit < 0xe000) {
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*code_point = 0x10000 + ((unit - 0xd800) << 10) + (next_unit - 0xdc00);
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return 4;
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}
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}
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}
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*code_point = -1;
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return 2;
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}
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