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How to Convert ASCII C program to UTF-8

How to Convert ASCII C program to UTF-8

(OP)
I need to convert a program written in C (ASCII) to utf-8 encoding, running in Solaris 9 so as to accommodate Chinese/Japanese/Korean characters What areas should I pay attention to?  Should I convert all variables whose data types are char or char* to wchar_t?  What functions should I use to manipulate the string?  

Here is one more question.  I have a main entry point like

int main(int argc, char *argv[]){
    setlocale(LC_ALL, "en.US_UTF-8");

    //like to know which of the two below is correct
    //CASE I:
    char buf[256];
    sprintf(buf, "Here is the first arg value = %s\n", argv[1]);

    //CASE II:
    wchar_t wbuf[512];
    swprintf(buf, L"Here is the first arg value = %ls\n", argv[1]);
     
}

Should I declare wchar_t variable to hold values passed from argv[1]?  Currently, in my program, I used a char buffer for this as shown above.

I am really new to i18n.  I read and searched on internet, but still want to understand this.

Any of your help is greatly appreciated.

Fox12

RE: How to Convert ASCII C program to UTF-8

Yes, change it to use the wide-char versions of your character types and functions.

You should also get the idea that number of characters != the number of bytes.  UTF-8 is a multi-byte encoding, so a single character could be 1, 2, or 3 bytes in length.  This has implications when you allocate memory, use loops, and pointer arithmetic.

You should also abstract any character literals in your code that get shown to the user into resource files.  This will facilite translation because the translation services company will only need the resource files, and won't need your full source tree.

Don't forget to make adjustments to your UI as well.  Foreign languages like German need a lot more screen real-estate because they have longer words.  

And don't forget to take cultural norms into account.  The typical US symbol for email is a mailbox mounted on a post by the street.  But this doesn't mean anything to Europeans, who receive their mail via a box or slot that is mounted on their house by the front door and looks nothing like a round-top metal box.

Chip H.

____________________________________________________________________
If you want to get the best response to a question, please read FAQ222-2244 first

RE: How to Convert ASCII C program to UTF-8

(OP)
Thanks so much, Chip H.  In the program, there is no GUI.  All it does is to listen to a socket connection to receive data, and write data to an xml file.

Any more detailed advise to minimize the transform work?

Fox12

RE: How to Convert ASCII C program to UTF-8

Just be careful with your memory allocations, and remember that chars != bytes.

Chip H.

____________________________________________________________________
If you want to get the best response to a question, please read FAQ222-2244 first

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