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       FcStrCopyFilename - copy a string, expanding '~'
       #include <fontconfig.h>
       FcChar8 * FcStrCopyFilename (const FcChar8 *s);
       Just  like FcStrCopy except that it converts any leading '~' characters
       in s to the value of the HOME environment variable.   Returns  NULL  if
       '~' is present in s and HOME is unset.
       Fontconfig version 2.2.0
                                 21 April 2003            FcStrCopyFilename(3)