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Wide character to UTF-8.
- Parameters:
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| s | where to store the converted UTF-8 character; |
| wc | the wide character to convert; |
| size | max number of bytes to store in s; |
- Return values:
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| >0 | the length in bytes of the converted UTF-8 character, stored in s; |
| -EINVAL | invalid wide character (don't know how to convert it to UTF-8); |
| -ENAMETOOLONG | size too small to store the UTF-8 character. |
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