ref: 611dced75f0a6c9fd4b35b88ee0dd9ac5806cb54 dir: purgatorio/libkern/toupper.c
toupper(int c) { if(c < 'a' || c > 'z') return c; return (c-'a'+'A'); } tolower(int c) { if(c < 'A' || c > 'Z') return c; return (c-'A'+'a'); }