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46 lines
735 B
C
46 lines
735 B
C
#include "runtime/util/utf.h"
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ssize_t
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utf8_to_utf16(uint16_t *out,
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const uint8_t *in,
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size_t len)
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{
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ssize_t rc = 0;
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ssize_t units;
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uint32_t code;
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uint16_t encoded[2];
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do
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{
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units = decode_utf8(&code, in);
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if(units == -1)
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return -1;
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if(code > 0)
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{
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in += units;
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units = encode_utf16(encoded, code);
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if(units == -1)
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return -1;
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if(out != NULL)
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{
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if(rc + units <= len)
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{
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*out++ = encoded[0];
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if(units > 1)
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*out++ = encoded[1];
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}
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}
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if(SSIZE_MAX - units >= rc)
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rc += units;
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else
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return -1;
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}
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} while(code > 0);
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return rc;
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}
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