Thread: UTF-16 and sprintf

Hi,

I have a "template" string, into which I insert values. Typicaly xml content.
For instance:

Code:

static const char *template = "<value>%s</value>";
char *value = "blabla";
buf [256];
int ret = sprintf(buf, template, value);

This has been working fine but now all of a sudden I need to insert a value that is encoded in UTF-16BE. So my value string "Hello" for instance looks something like hex: 00 48 00 65 00 6c 00 6c 00 6f

It appears that the 00 is blocking the string from being further read. Maybe this is the internal \0 representation? I say this because for test purposes I tried using little endian (utf-16LE) and I was able to get the 'H' but then nothing after that.

As a java developer trying to fix an old peice of C code, im a bit confused as how to handle this

Any help would be appreciated, thanks!

Unfortunately the UTF-16 is a requirement, so ill be sending it out with encoding="UTF-16"
Its running on linux, but I'm sending it out as a body of an http request, if that changes anything...

I am not sure if that means I can put a UTF-16 value in a UTF-8 encoded xml document, or the entire document and value(s) must be UTF-16. The problem is that I can't get either one to work, as its ignoreing my utf-16 encoded values

Thanks rcgldr, someone previously pointed me to swprintf, but it seems this only works when both my "template" and my "value" are wide chars. I will make a duplicate wide version of the template if I have to I guess, but it would be great to figure out how to get the wide chars into my ascii-utf8 template. I'm thinking at this point ill just write my own routine to copy the bytes...

Ah good information, I was just wokring on a wchar_t possible solution..
I am using iconv for conversion already, the real issue I am having is merging the template with the value.
The http header will contain whatever the xml encoding is set as, probably UTF-16BE seems to be the only thing that will work for my requirements, so bothe content typeheader and xml encoding value will be set to that, and I will encode the full xml doc in utf-16be.

At the end of the day, I have a string literal template, and I have a utf-16BE char*. I need to insert the char* into the template where the %s is, and the resulting string needs to be in UTF-16BE encoding.
I can re-code any of the strings, but the only way I know how to insert easily into the template is using sprintf, but this doesn't seem to work for wide chars. So I was going to make my template use wide chars and try using swprintf, but now you say thats a bit sketchy on linux. I might just have to manipulate the bytes myself at this point, I just can't believe there isn't an easy way to do this in C.... so painful....

Yes, that's the same conclusion I just came to. Unfortunately it took me 2 days instead of right away for you Thanks! That will work I think...