source: buchla-68k/orig/CLIBRARY/MEMCMPU.C@ 0170798

/*
   ============================================================================
        memcmpu -- compare two memory areas while ignoring case
        Version 4 -- 1987-06-15 -- D.N. Lynx Crowe
   ============================================================================
*/

#include "ctype.h"

int
memcmpu(s1, s2, n)
register char *s1, *s2;
int n;
{
        register char c1, c2;

        while (n) {

                c1 = *s1++;
                c2 = *s2++;

                if (isascii(c1) && islower(c1))
                        c1 = _toupper(c1);

                if (isascii(c2) && islower(c2))
                        c2 = _toupper(c2);

                if (c1 < c2)
                        return(-1);

                if (c1 > c2)
                        return(1);

                n--;
        }

        return(0);
}