ref: 1d36866ee5505eec6d0310522e5ba8879d44f5bd
dir: /src/libscc/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;
}