str_diffn - compare two ASCIIZ strings

str_diffn  returns  negative, 0, or positive, depending on whether the string a[0], a[1], ..., a[n]=='\0'
       is lexicographically smaller than, equal to, or greater than the string b[0], b[1], ..., b[m-1]=='\0'.

       If the strings are different, str_diffn does not read bytes past the first difference.  The strings  will
       be considered equal if the first limit characters match.

       str_diffn - compare two ASCIIZ strings

strlen(3)

                                                                                                    str_diffn(3)

#include<libowfat/str.h>

       int str_diffn(const char* a,const char* b,size_t limit);