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Full Discussion: strlen for UTF-8
Top Forums Programming strlen for UTF-8 Post 302414174 by Corona688 on Monday 19th of April 2010 11:29:16 AM
Old 04-19-2010
UTF8 is encoded in 8-bit segments but occasionally it can take more than one byte to encode a full character. So the number of characters is wholly unrelated to the number of characters in the string; changing a #define won't make it any more right. None of the usual strlen/sizeof/etc things apply to a system where character encodings aren't always the same size!

If you want to count the number of UTF-8 encoded characters in the string, as opposed to the physical length of the string in bytes, I once wrote code for a UTF8 getc. Use strlen to get the length of the datablock to feed it, then process UTF8 chars one by one until the end of the string to get the UTF8 char count.
 

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LEARN ABOUT OPENSOLARIS

fcutf8len

FcUtf8Len(3)															      FcUtf8Len(3)

NAME

       FcUtf8Len - count UTF-8 encoded chars

SYNOPSIS

       cc [ flag... ] file... -lfontconfig [ library... ]

       #include <fontconfig.h>

       FcBool FcUtf8Len (FcChar8 *src, int len, int *nchar, int *wchar);

DESCRIPTION

       Counts  the  number of Unicode chars in len bytes of src.  Places that count in nchar.  wchar contains 1, 2 or 4 depending on the number of
       bytes needed to hold the largest unicode char counted.  The return value indicates whether src is a well-formed UTF8 string.

VERSION

       Fontconfig version 2.5.0

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWfontconfig		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Volatile			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |See XInitThreads(3X11)	   |
       +-----------------------------+-----------------------------+

								 13 November 2007						      FcUtf8Len(3)
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