source: buchla-68k/libsm/memcmpu.c@ e225e77

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

#include "ctype.h"

int16_t memcmpu(void *vp1, void *vp2, int16_t n)
{
        int8_t *cp1 = vp1;
        int8_t *cp2 = vp2;
        register int8_t c1, c2;

        while (n) {

                c1 = *cp1++;
                c2 = *cp2++;

                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);
}