strnlen - determine the length of a fixed-size string
        #include <string.h>
       size_t strnlen (const char *s, size_t maxlen);
       The  strnlen  function  returns	the number of characters in the string
       pointed to by s, not including the terminating '\0' character,  but  at
       most  maxlen.  In  doing  this,	strnlen looks only at the first maxlen
       characters at s and never beyond s+maxlen.
       The strnlen function returns strlen(s), if that is less than maxlen, or
       maxlen  if there is no '\0' character among the first maxlen characters
       pointed to by s.
       This function is a GNU extension.
 
       strlen(3)
GNU				  1999-07-25			    STRNLEN(3)
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