ref: e2e50a8e5a74452672f9418bcdfe4de10f600ed0 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'); }