CODEWITHSUNDEEP
cutf-8
Ze..
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Reputation: 163

UTF-8 string size in bytes

I need to determine the length of UTF-8 string in bytes in C. How to do it correctly? As I know, in UTF-8 terminal symbol has 1-byte size. Can I use strlen function for this?

Upvotes: 3

Views: 6651

Answers (2)

Daniel Fischer
Daniel Fischer

Reputation: 183873

Can I use strlen function for this?

Yes, strlen gives you the number of bytes before the first '\0' character, so

strlen(utf8) + 1

is the number of bytes in utf8 including the 0-terminator, since no character other than '\0' contains a 0 byte in UTF-8.

Of course, that only works if utf8 is actually UTF-8 encoded, otherwise you need to convert it to UTF-8 first.

Upvotes: 11

Sebastian Redl
Sebastian Redl

Reputation: 71899

Yes, strlen() will simply count the bytes until it encounters the NUL, which is the correct terminator for a 0-terminated UTF-8-encoded C string.

Upvotes: 2

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