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`strncmp'--character string compare

     #include <string.h>
     int strncmp(const char *A, const char * B, size_t LENGTH);
`strncmp' compares up to LENGTH characters from the string at A to the
string at B.
If `*A' sorts lexicographically after `*B', `strncmp' returns a number
greater than zero.  If the two strings are equivalent, `strncmp'
returns zero.  If `*A' sorts lexicographically before `*B', `strncmp'
returns a number less than zero.
`strncmp' is ANSI C.
   `strncmp' requires no supporting OS subroutines.