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`strcasecmp'--case insensitive character string compare

     #include <string.h>
     int strcasecmp(const char *A, const char *B);
`strcasecmp' compares the string at A to the string at B in a
case-insensitive manner.
If `*A' sorts lexicographically after `*B' (after both are converted to
upper case), `strcasecmp' returns a number greater than zero.  If the
two strings match, `strcasecmp' returns zero.  If `*A' sorts
lexicographically before `*B', `strcasecmp' returns a number less than
`strcasecmp' is in the Berkeley Software Distribution.
   `strcasecmp' requires no supporting OS subroutines. It uses
tolower() from elsewhere in this library.