cat_needutf - check if an ASCII string is valid UTF-8 format
#include <cat/catutil.h>
char *cat_needutf(const char *ascii);
Checks if ASCII string ascii needs further processing in order to have valid UTF-8 format, that is,
containing any characters with the most significant bit set.
Returns NULL if not, or a pointer to the first ``eight-bit'' character if
it does.
cat, catutil