Every time you visit for the FIRST TIME today... [Part 1]

Post a random function that you made. May be from any project you've done or make one impromptu.

Any QUALITY is allowed. No bullying!

int strcmp(const char *u, const char *v) {
union {const char *c; const unsigned char *u;} a, b;
for(a.c = u, b.c = v; *a.u == *b.u && *a.u != '\0'; a.u++, b.u++);
return *a.u - *b.u;
}