ref: c809e59d972aead305d59b23e4d1d156c1ebd2a6
dir: /src/libscc/casecmp.c/
static char sccsid[] = "@(#) ./lib/scc/casecmp.c";
#include <ctype.h>
#include <scc/scc.h>
int
casecmp(const char *s1, const char *s2)
{
while (*s1 && toupper(*s1) == toupper(*s2))
++s1, ++s2;
return *s1 - *s2;
}