ref: 0fe0a3038c7cb85d200db18a77a83f07683c6d44
dir: /sys/src/libc/port/toupper.c/
#include <ctype.h>
int
toupper(int c)
{
if(c < 'a' || c > 'z')
return c;
return _toupper(c);
}
int
tolower(int c)
{
if(c < 'A' || c > 'Z')
return c;
return _tolower(c);
}