How to get length of char* string

In the below code, I have to count the length of the string and put it in hard code. How can I programmatically do this? I'm only familiar with string.length(), which is different than char string...

const char* MESSAGE = "Hello World";
const int MESSAGE_LENGTH = 11;

http://www.nongnu.org/avr-libc/user-manual/group__avr__string.html

look at strlen

done

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Thanks! I've read thru the reference section listing all the functions and things I can use in this arduino language, but strlen wasn't listed in there. Is there a complete list of functions I can use in the arduino IDE, or is that reference section pretty complete?

Standard C/C++ function... as defined in string.h

http://www.cplusplus.com/reference/clibrary/cstring/strlen/

abrookfield: Standard C/C++ function... as defined in string.h

http://www.cplusplus.com/reference/clibrary/cstring/strlen/

this is more AVR oriented

http://www.nongnu.org/avr-libc/user-manual/modules.html