strxfrm
#define ZYAN_STRXFRM strxfrm
extern size_t strxfrm(char *string1, const char *string2, size_t length);
strxfrm(sortKeyA, coll[i].a, 100);
strxfrm(sortKeyB, coll[i].b, 100);
return strxfrm(string1, string2, length);